| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.text; |
| |
| import android.annotation.IntDef; |
| import android.annotation.IntRange; |
| import android.annotation.UnsupportedAppUsage; |
| import android.graphics.Canvas; |
| import android.graphics.Paint; |
| import android.graphics.Path; |
| import android.graphics.Rect; |
| import android.graphics.text.LineBreaker; |
| import android.text.method.TextKeyListener; |
| import android.text.style.AlignmentSpan; |
| import android.text.style.LeadingMarginSpan; |
| import android.text.style.LeadingMarginSpan.LeadingMarginSpan2; |
| import android.text.style.LineBackgroundSpan; |
| import android.text.style.ParagraphStyle; |
| import android.text.style.ReplacementSpan; |
| import android.text.style.TabStopSpan; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.util.ArrayUtils; |
| import com.android.internal.util.GrowingArrayUtils; |
| |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.util.Arrays; |
| |
| /** |
| * A base class that manages text layout in visual elements on |
| * the screen. |
| * <p>For text that will be edited, use a {@link DynamicLayout}, |
| * which will be updated as the text changes. |
| * For text that will not change, use a {@link StaticLayout}. |
| */ |
| public abstract class Layout { |
| /** @hide */ |
| @IntDef(prefix = { "BREAK_STRATEGY_" }, value = { |
| LineBreaker.BREAK_STRATEGY_SIMPLE, |
| LineBreaker.BREAK_STRATEGY_HIGH_QUALITY, |
| LineBreaker.BREAK_STRATEGY_BALANCED |
| }) |
| @Retention(RetentionPolicy.SOURCE) |
| public @interface BreakStrategy {} |
| |
| /** |
| * Value for break strategy indicating simple line breaking. Automatic hyphens are not added |
| * (though soft hyphens are respected), and modifying text generally doesn't affect the layout |
| * before it (which yields a more consistent user experience when editing), but layout may not |
| * be the highest quality. |
| */ |
| public static final int BREAK_STRATEGY_SIMPLE = LineBreaker.BREAK_STRATEGY_SIMPLE; |
| |
| /** |
| * Value for break strategy indicating high quality line breaking, including automatic |
| * hyphenation and doing whole-paragraph optimization of line breaks. |
| */ |
| public static final int BREAK_STRATEGY_HIGH_QUALITY = LineBreaker.BREAK_STRATEGY_HIGH_QUALITY; |
| |
| /** |
| * Value for break strategy indicating balanced line breaking. The breaks are chosen to |
| * make all lines as close to the same length as possible, including automatic hyphenation. |
| */ |
| public static final int BREAK_STRATEGY_BALANCED = LineBreaker.BREAK_STRATEGY_BALANCED; |
| |
| /** @hide */ |
| @IntDef(prefix = { "HYPHENATION_FREQUENCY_" }, value = { |
| HYPHENATION_FREQUENCY_NORMAL, |
| HYPHENATION_FREQUENCY_FULL, |
| HYPHENATION_FREQUENCY_NONE |
| }) |
| @Retention(RetentionPolicy.SOURCE) |
| public @interface HyphenationFrequency {} |
| |
| /** |
| * Value for hyphenation frequency indicating no automatic hyphenation. Useful |
| * for backward compatibility, and for cases where the automatic hyphenation algorithm results |
| * in incorrect hyphenation. Mid-word breaks may still happen when a word is wider than the |
| * layout and there is otherwise no valid break. Soft hyphens are ignored and will not be used |
| * as suggestions for potential line breaks. |
| */ |
| public static final int HYPHENATION_FREQUENCY_NONE = LineBreaker.HYPHENATION_FREQUENCY_NONE; |
| |
| /** |
| * Value for hyphenation frequency indicating a light amount of automatic hyphenation, which |
| * is a conservative default. Useful for informal cases, such as short sentences or chat |
| * messages. |
| */ |
| public static final int HYPHENATION_FREQUENCY_NORMAL = LineBreaker.HYPHENATION_FREQUENCY_NORMAL; |
| |
| /** |
| * Value for hyphenation frequency indicating the full amount of automatic hyphenation, typical |
| * in typography. Useful for running text and where it's important to put the maximum amount of |
| * text in a screen with limited space. |
| */ |
| public static final int HYPHENATION_FREQUENCY_FULL = LineBreaker.HYPHENATION_FREQUENCY_FULL; |
| |
| private static final ParagraphStyle[] NO_PARA_SPANS = |
| ArrayUtils.emptyArray(ParagraphStyle.class); |
| |
| /** @hide */ |
| @IntDef(prefix = { "JUSTIFICATION_MODE_" }, value = { |
| LineBreaker.JUSTIFICATION_MODE_NONE, |
| LineBreaker.JUSTIFICATION_MODE_INTER_WORD |
| }) |
| @Retention(RetentionPolicy.SOURCE) |
| public @interface JustificationMode {} |
| |
| /** |
| * Value for justification mode indicating no justification. |
| */ |
| public static final int JUSTIFICATION_MODE_NONE = LineBreaker.JUSTIFICATION_MODE_NONE; |
| |
| /** |
| * Value for justification mode indicating the text is justified by stretching word spacing. |
| */ |
| public static final int JUSTIFICATION_MODE_INTER_WORD = |
| LineBreaker.JUSTIFICATION_MODE_INTER_WORD; |
| |
| /* |
| * Line spacing multiplier for default line spacing. |
| */ |
| public static final float DEFAULT_LINESPACING_MULTIPLIER = 1.0f; |
| |
| /* |
| * Line spacing addition for default line spacing. |
| */ |
| public static final float DEFAULT_LINESPACING_ADDITION = 0.0f; |
| |
| /** |
| * Return how wide a layout must be in order to display the specified text with one line per |
| * paragraph. |
| * |
| * <p>As of O, Uses |
| * {@link TextDirectionHeuristics#FIRSTSTRONG_LTR} as the default text direction heuristics. In |
| * the earlier versions uses {@link TextDirectionHeuristics#LTR} as the default.</p> |
| */ |
| public static float getDesiredWidth(CharSequence source, |
| TextPaint paint) { |
| return getDesiredWidth(source, 0, source.length(), paint); |
| } |
| |
| /** |
| * Return how wide a layout must be in order to display the specified text slice with one |
| * line per paragraph. |
| * |
| * <p>As of O, Uses |
| * {@link TextDirectionHeuristics#FIRSTSTRONG_LTR} as the default text direction heuristics. In |
| * the earlier versions uses {@link TextDirectionHeuristics#LTR} as the default.</p> |
| */ |
| public static float getDesiredWidth(CharSequence source, int start, int end, TextPaint paint) { |
| return getDesiredWidth(source, start, end, paint, TextDirectionHeuristics.FIRSTSTRONG_LTR); |
| } |
| |
| /** |
| * Return how wide a layout must be in order to display the |
| * specified text slice with one line per paragraph. |
| * |
| * @hide |
| */ |
| public static float getDesiredWidth(CharSequence source, int start, int end, TextPaint paint, |
| TextDirectionHeuristic textDir) { |
| return getDesiredWidthWithLimit(source, start, end, paint, textDir, Float.MAX_VALUE); |
| } |
| /** |
| * Return how wide a layout must be in order to display the |
| * specified text slice with one line per paragraph. |
| * |
| * If the measured width exceeds given limit, returns limit value instead. |
| * @hide |
| */ |
| public static float getDesiredWidthWithLimit(CharSequence source, int start, int end, |
| TextPaint paint, TextDirectionHeuristic textDir, float upperLimit) { |
| float need = 0; |
| |
| int next; |
| for (int i = start; i <= end; i = next) { |
| next = TextUtils.indexOf(source, '\n', i, end); |
| |
| if (next < 0) |
| next = end; |
| |
| // note, omits trailing paragraph char |
| float w = measurePara(paint, source, i, next, textDir); |
| if (w > upperLimit) { |
| return upperLimit; |
| } |
| |
| if (w > need) |
| need = w; |
| |
| next++; |
| } |
| |
| return need; |
| } |
| |
| /** |
| * Subclasses of Layout use this constructor to set the display text, |
| * width, and other standard properties. |
| * @param text the text to render |
| * @param paint the default paint for the layout. Styles can override |
| * various attributes of the paint. |
| * @param width the wrapping width for the text. |
| * @param align whether to left, right, or center the text. Styles can |
| * override the alignment. |
| * @param spacingMult factor by which to scale the font size to get the |
| * default line spacing |
| * @param spacingAdd amount to add to the default line spacing |
| */ |
| protected Layout(CharSequence text, TextPaint paint, |
| int width, Alignment align, |
| float spacingMult, float spacingAdd) { |
| this(text, paint, width, align, TextDirectionHeuristics.FIRSTSTRONG_LTR, |
| spacingMult, spacingAdd); |
| } |
| |
| /** |
| * Subclasses of Layout use this constructor to set the display text, |
| * width, and other standard properties. |
| * @param text the text to render |
| * @param paint the default paint for the layout. Styles can override |
| * various attributes of the paint. |
| * @param width the wrapping width for the text. |
| * @param align whether to left, right, or center the text. Styles can |
| * override the alignment. |
| * @param spacingMult factor by which to scale the font size to get the |
| * default line spacing |
| * @param spacingAdd amount to add to the default line spacing |
| * |
| * @hide |
| */ |
| protected Layout(CharSequence text, TextPaint paint, |
| int width, Alignment align, TextDirectionHeuristic textDir, |
| float spacingMult, float spacingAdd) { |
| |
| if (width < 0) |
| throw new IllegalArgumentException("Layout: " + width + " < 0"); |
| |
| // Ensure paint doesn't have baselineShift set. |
| // While normally we don't modify the paint the user passed in, |
| // we were already doing this in Styled.drawUniformRun with both |
| // baselineShift and bgColor. We probably should reevaluate bgColor. |
| if (paint != null) { |
| paint.bgColor = 0; |
| paint.baselineShift = 0; |
| } |
| |
| mText = text; |
| mPaint = paint; |
| mWidth = width; |
| mAlignment = align; |
| mSpacingMult = spacingMult; |
| mSpacingAdd = spacingAdd; |
| mSpannedText = text instanceof Spanned; |
| mTextDir = textDir; |
| } |
| |
| /** @hide */ |
| protected void setJustificationMode(@JustificationMode int justificationMode) { |
| mJustificationMode = justificationMode; |
| } |
| |
| /** |
| * Replace constructor properties of this Layout with new ones. Be careful. |
| */ |
| /* package */ void replaceWith(CharSequence text, TextPaint paint, |
| int width, Alignment align, |
| float spacingmult, float spacingadd) { |
| if (width < 0) { |
| throw new IllegalArgumentException("Layout: " + width + " < 0"); |
| } |
| |
| mText = text; |
| mPaint = paint; |
| mWidth = width; |
| mAlignment = align; |
| mSpacingMult = spacingmult; |
| mSpacingAdd = spacingadd; |
| mSpannedText = text instanceof Spanned; |
| } |
| |
| /** |
| * Draw this Layout on the specified Canvas. |
| */ |
| public void draw(Canvas c) { |
| draw(c, null, null, 0); |
| } |
| |
| /** |
| * Draw this Layout on the specified canvas, with the highlight path drawn |
| * between the background and the text. |
| * |
| * @param canvas the canvas |
| * @param highlight the path of the highlight or cursor; can be null |
| * @param highlightPaint the paint for the highlight |
| * @param cursorOffsetVertical the amount to temporarily translate the |
| * canvas while rendering the highlight |
| */ |
| public void draw(Canvas canvas, Path highlight, Paint highlightPaint, |
| int cursorOffsetVertical) { |
| final long lineRange = getLineRangeForDraw(canvas); |
| int firstLine = TextUtils.unpackRangeStartFromLong(lineRange); |
| int lastLine = TextUtils.unpackRangeEndFromLong(lineRange); |
| if (lastLine < 0) return; |
| |
| drawBackground(canvas, highlight, highlightPaint, cursorOffsetVertical, |
| firstLine, lastLine); |
| drawText(canvas, firstLine, lastLine); |
| } |
| |
| private boolean isJustificationRequired(int lineNum) { |
| if (mJustificationMode == JUSTIFICATION_MODE_NONE) return false; |
| final int lineEnd = getLineEnd(lineNum); |
| return lineEnd < mText.length() && mText.charAt(lineEnd - 1) != '\n'; |
| } |
| |
| private float getJustifyWidth(int lineNum) { |
| Alignment paraAlign = mAlignment; |
| |
| int left = 0; |
| int right = mWidth; |
| |
| final int dir = getParagraphDirection(lineNum); |
| |
| ParagraphStyle[] spans = NO_PARA_SPANS; |
| if (mSpannedText) { |
| Spanned sp = (Spanned) mText; |
| final int start = getLineStart(lineNum); |
| |
| final boolean isFirstParaLine = (start == 0 || mText.charAt(start - 1) == '\n'); |
| |
| if (isFirstParaLine) { |
| final int spanEnd = sp.nextSpanTransition(start, mText.length(), |
| ParagraphStyle.class); |
| spans = getParagraphSpans(sp, start, spanEnd, ParagraphStyle.class); |
| |
| for (int n = spans.length - 1; n >= 0; n--) { |
| if (spans[n] instanceof AlignmentSpan) { |
| paraAlign = ((AlignmentSpan) spans[n]).getAlignment(); |
| break; |
| } |
| } |
| } |
| |
| final int length = spans.length; |
| boolean useFirstLineMargin = isFirstParaLine; |
| for (int n = 0; n < length; n++) { |
| if (spans[n] instanceof LeadingMarginSpan2) { |
| int count = ((LeadingMarginSpan2) spans[n]).getLeadingMarginLineCount(); |
| int startLine = getLineForOffset(sp.getSpanStart(spans[n])); |
| if (lineNum < startLine + count) { |
| useFirstLineMargin = true; |
| break; |
| } |
| } |
| } |
| for (int n = 0; n < length; n++) { |
| if (spans[n] instanceof LeadingMarginSpan) { |
| LeadingMarginSpan margin = (LeadingMarginSpan) spans[n]; |
| if (dir == DIR_RIGHT_TO_LEFT) { |
| right -= margin.getLeadingMargin(useFirstLineMargin); |
| } else { |
| left += margin.getLeadingMargin(useFirstLineMargin); |
| } |
| } |
| } |
| } |
| |
| final Alignment align; |
| if (paraAlign == Alignment.ALIGN_LEFT) { |
| align = (dir == DIR_LEFT_TO_RIGHT) ? Alignment.ALIGN_NORMAL : Alignment.ALIGN_OPPOSITE; |
| } else if (paraAlign == Alignment.ALIGN_RIGHT) { |
| align = (dir == DIR_LEFT_TO_RIGHT) ? Alignment.ALIGN_OPPOSITE : Alignment.ALIGN_NORMAL; |
| } else { |
| align = paraAlign; |
| } |
| |
| final int indentWidth; |
| if (align == Alignment.ALIGN_NORMAL) { |
| if (dir == DIR_LEFT_TO_RIGHT) { |
| indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_LEFT); |
| } else { |
| indentWidth = -getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT); |
| } |
| } else if (align == Alignment.ALIGN_OPPOSITE) { |
| if (dir == DIR_LEFT_TO_RIGHT) { |
| indentWidth = -getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT); |
| } else { |
| indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_LEFT); |
| } |
| } else { // Alignment.ALIGN_CENTER |
| indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_CENTER); |
| } |
| |
| return right - left - indentWidth; |
| } |
| |
| /** |
| * @hide |
| */ |
| @UnsupportedAppUsage |
| public void drawText(Canvas canvas, int firstLine, int lastLine) { |
| int previousLineBottom = getLineTop(firstLine); |
| int previousLineEnd = getLineStart(firstLine); |
| ParagraphStyle[] spans = NO_PARA_SPANS; |
| int spanEnd = 0; |
| final TextPaint paint = mWorkPaint; |
| paint.set(mPaint); |
| CharSequence buf = mText; |
| |
| Alignment paraAlign = mAlignment; |
| TabStops tabStops = null; |
| boolean tabStopsIsInitialized = false; |
| |
| TextLine tl = TextLine.obtain(); |
| |
| // Draw the lines, one at a time. |
| // The baseline is the top of the following line minus the current line's descent. |
| for (int lineNum = firstLine; lineNum <= lastLine; lineNum++) { |
| int start = previousLineEnd; |
| previousLineEnd = getLineStart(lineNum + 1); |
| final boolean justify = isJustificationRequired(lineNum); |
| int end = getLineVisibleEnd(lineNum, start, previousLineEnd); |
| paint.setStartHyphenEdit(getStartHyphenEdit(lineNum)); |
| paint.setEndHyphenEdit(getEndHyphenEdit(lineNum)); |
| |
| int ltop = previousLineBottom; |
| int lbottom = getLineTop(lineNum + 1); |
| previousLineBottom = lbottom; |
| int lbaseline = lbottom - getLineDescent(lineNum); |
| |
| int dir = getParagraphDirection(lineNum); |
| int left = 0; |
| int right = mWidth; |
| |
| if (mSpannedText) { |
| Spanned sp = (Spanned) buf; |
| int textLength = buf.length(); |
| boolean isFirstParaLine = (start == 0 || buf.charAt(start - 1) == '\n'); |
| |
| // New batch of paragraph styles, collect into spans array. |
| // Compute the alignment, last alignment style wins. |
| // Reset tabStops, we'll rebuild if we encounter a line with |
| // tabs. |
| // We expect paragraph spans to be relatively infrequent, use |
| // spanEnd so that we can check less frequently. Since |
| // paragraph styles ought to apply to entire paragraphs, we can |
| // just collect the ones present at the start of the paragraph. |
| // If spanEnd is before the end of the paragraph, that's not |
| // our problem. |
| if (start >= spanEnd && (lineNum == firstLine || isFirstParaLine)) { |
| spanEnd = sp.nextSpanTransition(start, textLength, |
| ParagraphStyle.class); |
| spans = getParagraphSpans(sp, start, spanEnd, ParagraphStyle.class); |
| |
| paraAlign = mAlignment; |
| for (int n = spans.length - 1; n >= 0; n--) { |
| if (spans[n] instanceof AlignmentSpan) { |
| paraAlign = ((AlignmentSpan) spans[n]).getAlignment(); |
| break; |
| } |
| } |
| |
| tabStopsIsInitialized = false; |
| } |
| |
| // Draw all leading margin spans. Adjust left or right according |
| // to the paragraph direction of the line. |
| final int length = spans.length; |
| boolean useFirstLineMargin = isFirstParaLine; |
| for (int n = 0; n < length; n++) { |
| if (spans[n] instanceof LeadingMarginSpan2) { |
| int count = ((LeadingMarginSpan2) spans[n]).getLeadingMarginLineCount(); |
| int startLine = getLineForOffset(sp.getSpanStart(spans[n])); |
| // if there is more than one LeadingMarginSpan2, use |
| // the count that is greatest |
| if (lineNum < startLine + count) { |
| useFirstLineMargin = true; |
| break; |
| } |
| } |
| } |
| for (int n = 0; n < length; n++) { |
| if (spans[n] instanceof LeadingMarginSpan) { |
| LeadingMarginSpan margin = (LeadingMarginSpan) spans[n]; |
| if (dir == DIR_RIGHT_TO_LEFT) { |
| margin.drawLeadingMargin(canvas, paint, right, dir, ltop, |
| lbaseline, lbottom, buf, |
| start, end, isFirstParaLine, this); |
| right -= margin.getLeadingMargin(useFirstLineMargin); |
| } else { |
| margin.drawLeadingMargin(canvas, paint, left, dir, ltop, |
| lbaseline, lbottom, buf, |
| start, end, isFirstParaLine, this); |
| left += margin.getLeadingMargin(useFirstLineMargin); |
| } |
| } |
| } |
| } |
| |
| boolean hasTab = getLineContainsTab(lineNum); |
| // Can't tell if we have tabs for sure, currently |
| if (hasTab && !tabStopsIsInitialized) { |
| if (tabStops == null) { |
| tabStops = new TabStops(TAB_INCREMENT, spans); |
| } else { |
| tabStops.reset(TAB_INCREMENT, spans); |
| } |
| tabStopsIsInitialized = true; |
| } |
| |
| // Determine whether the line aligns to normal, opposite, or center. |
| Alignment align = paraAlign; |
| if (align == Alignment.ALIGN_LEFT) { |
| align = (dir == DIR_LEFT_TO_RIGHT) ? |
| Alignment.ALIGN_NORMAL : Alignment.ALIGN_OPPOSITE; |
| } else if (align == Alignment.ALIGN_RIGHT) { |
| align = (dir == DIR_LEFT_TO_RIGHT) ? |
| Alignment.ALIGN_OPPOSITE : Alignment.ALIGN_NORMAL; |
| } |
| |
| int x; |
| final int indentWidth; |
| if (align == Alignment.ALIGN_NORMAL) { |
| if (dir == DIR_LEFT_TO_RIGHT) { |
| indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_LEFT); |
| x = left + indentWidth; |
| } else { |
| indentWidth = -getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT); |
| x = right - indentWidth; |
| } |
| } else { |
| int max = (int)getLineExtent(lineNum, tabStops, false); |
| if (align == Alignment.ALIGN_OPPOSITE) { |
| if (dir == DIR_LEFT_TO_RIGHT) { |
| indentWidth = -getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT); |
| x = right - max - indentWidth; |
| } else { |
| indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_LEFT); |
| x = left - max + indentWidth; |
| } |
| } else { // Alignment.ALIGN_CENTER |
| indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_CENTER); |
| max = max & ~1; |
| x = ((right + left - max) >> 1) + indentWidth; |
| } |
| } |
| |
| Directions directions = getLineDirections(lineNum); |
| if (directions == DIRS_ALL_LEFT_TO_RIGHT && !mSpannedText && !hasTab && !justify) { |
| // XXX: assumes there's nothing additional to be done |
| canvas.drawText(buf, start, end, x, lbaseline, paint); |
| } else { |
| tl.set(paint, buf, start, end, dir, directions, hasTab, tabStops, |
| getEllipsisStart(lineNum), |
| getEllipsisStart(lineNum) + getEllipsisCount(lineNum)); |
| if (justify) { |
| tl.justify(right - left - indentWidth); |
| } |
| tl.draw(canvas, x, ltop, lbaseline, lbottom); |
| } |
| } |
| |
| TextLine.recycle(tl); |
| } |
| |
| /** |
| * @hide |
| */ |
| @UnsupportedAppUsage |
| public void drawBackground(Canvas canvas, Path highlight, Paint highlightPaint, |
| int cursorOffsetVertical, int firstLine, int lastLine) { |
| // First, draw LineBackgroundSpans. |
| // LineBackgroundSpans know nothing about the alignment, margins, or |
| // direction of the layout or line. XXX: Should they? |
| // They are evaluated at each line. |
| if (mSpannedText) { |
| if (mLineBackgroundSpans == null) { |
| mLineBackgroundSpans = new SpanSet<LineBackgroundSpan>(LineBackgroundSpan.class); |
| } |
| |
| Spanned buffer = (Spanned) mText; |
| int textLength = buffer.length(); |
| mLineBackgroundSpans.init(buffer, 0, textLength); |
| |
| if (mLineBackgroundSpans.numberOfSpans > 0) { |
| int previousLineBottom = getLineTop(firstLine); |
| int previousLineEnd = getLineStart(firstLine); |
| ParagraphStyle[] spans = NO_PARA_SPANS; |
| int spansLength = 0; |
| TextPaint paint = mPaint; |
| int spanEnd = 0; |
| final int width = mWidth; |
| for (int i = firstLine; i <= lastLine; i++) { |
| int start = previousLineEnd; |
| int end = getLineStart(i + 1); |
| previousLineEnd = end; |
| |
| int ltop = previousLineBottom; |
| int lbottom = getLineTop(i + 1); |
| previousLineBottom = lbottom; |
| int lbaseline = lbottom - getLineDescent(i); |
| |
| if (end >= spanEnd) { |
| // These should be infrequent, so we'll use this so that |
| // we don't have to check as often. |
| spanEnd = mLineBackgroundSpans.getNextTransition(start, textLength); |
| // All LineBackgroundSpans on a line contribute to its background. |
| spansLength = 0; |
| // Duplication of the logic of getParagraphSpans |
| if (start != end || start == 0) { |
| // Equivalent to a getSpans(start, end), but filling the 'spans' local |
| // array instead to reduce memory allocation |
| for (int j = 0; j < mLineBackgroundSpans.numberOfSpans; j++) { |
| // equal test is valid since both intervals are not empty by |
| // construction |
| if (mLineBackgroundSpans.spanStarts[j] >= end || |
| mLineBackgroundSpans.spanEnds[j] <= start) continue; |
| spans = GrowingArrayUtils.append( |
| spans, spansLength, mLineBackgroundSpans.spans[j]); |
| spansLength++; |
| } |
| } |
| } |
| |
| for (int n = 0; n < spansLength; n++) { |
| LineBackgroundSpan lineBackgroundSpan = (LineBackgroundSpan) spans[n]; |
| lineBackgroundSpan.drawBackground(canvas, paint, 0, width, |
| ltop, lbaseline, lbottom, |
| buffer, start, end, i); |
| } |
| } |
| } |
| mLineBackgroundSpans.recycle(); |
| } |
| |
| // There can be a highlight even without spans if we are drawing |
| // a non-spanned transformation of a spanned editing buffer. |
| if (highlight != null) { |
| if (cursorOffsetVertical != 0) canvas.translate(0, cursorOffsetVertical); |
| canvas.drawPath(highlight, highlightPaint); |
| if (cursorOffsetVertical != 0) canvas.translate(0, -cursorOffsetVertical); |
| } |
| } |
| |
| /** |
| * @param canvas |
| * @return The range of lines that need to be drawn, possibly empty. |
| * @hide |
| */ |
| @UnsupportedAppUsage |
| public long getLineRangeForDraw(Canvas canvas) { |
| int dtop, dbottom; |
| |
| synchronized (sTempRect) { |
| if (!canvas.getClipBounds(sTempRect)) { |
| // Negative range end used as a special flag |
| return TextUtils.packRangeInLong(0, -1); |
| } |
| |
| dtop = sTempRect.top; |
| dbottom = sTempRect.bottom; |
| } |
| |
| final int top = Math.max(dtop, 0); |
| final int bottom = Math.min(getLineTop(getLineCount()), dbottom); |
| |
| if (top >= bottom) return TextUtils.packRangeInLong(0, -1); |
| return TextUtils.packRangeInLong(getLineForVertical(top), getLineForVertical(bottom)); |
| } |
| |
| /** |
| * Return the start position of the line, given the left and right bounds |
| * of the margins. |
| * |
| * @param line the line index |
| * @param left the left bounds (0, or leading margin if ltr para) |
| * @param right the right bounds (width, minus leading margin if rtl para) |
| * @return the start position of the line (to right of line if rtl para) |
| */ |
| private int getLineStartPos(int line, int left, int right) { |
| // Adjust the point at which to start rendering depending on the |
| // alignment of the paragraph. |
| Alignment align = getParagraphAlignment(line); |
| int dir = getParagraphDirection(line); |
| |
| if (align == Alignment.ALIGN_LEFT) { |
| align = (dir == DIR_LEFT_TO_RIGHT) ? Alignment.ALIGN_NORMAL : Alignment.ALIGN_OPPOSITE; |
| } else if (align == Alignment.ALIGN_RIGHT) { |
| align = (dir == DIR_LEFT_TO_RIGHT) ? Alignment.ALIGN_OPPOSITE : Alignment.ALIGN_NORMAL; |
| } |
| |
| int x; |
| if (align == Alignment.ALIGN_NORMAL) { |
| if (dir == DIR_LEFT_TO_RIGHT) { |
| x = left + getIndentAdjust(line, Alignment.ALIGN_LEFT); |
| } else { |
| x = right + getIndentAdjust(line, Alignment.ALIGN_RIGHT); |
| } |
| } else { |
| TabStops tabStops = null; |
| if (mSpannedText && getLineContainsTab(line)) { |
| Spanned spanned = (Spanned) mText; |
| int start = getLineStart(line); |
| int spanEnd = spanned.nextSpanTransition(start, spanned.length(), |
| TabStopSpan.class); |
| TabStopSpan[] tabSpans = getParagraphSpans(spanned, start, spanEnd, |
| TabStopSpan.class); |
| if (tabSpans.length > 0) { |
| tabStops = new TabStops(TAB_INCREMENT, tabSpans); |
| } |
| } |
| int max = (int)getLineExtent(line, tabStops, false); |
| if (align == Alignment.ALIGN_OPPOSITE) { |
| if (dir == DIR_LEFT_TO_RIGHT) { |
| x = right - max + getIndentAdjust(line, Alignment.ALIGN_RIGHT); |
| } else { |
| // max is negative here |
| x = left - max + getIndentAdjust(line, Alignment.ALIGN_LEFT); |
| } |
| } else { // Alignment.ALIGN_CENTER |
| max = max & ~1; |
| x = (left + right - max) >> 1 + getIndentAdjust(line, Alignment.ALIGN_CENTER); |
| } |
| } |
| return x; |
| } |
| |
| /** |
| * Return the text that is displayed by this Layout. |
| */ |
| public final CharSequence getText() { |
| return mText; |
| } |
| |
| /** |
| * Return the base Paint properties for this layout. |
| * Do NOT change the paint, which may result in funny |
| * drawing for this layout. |
| */ |
| public final TextPaint getPaint() { |
| return mPaint; |
| } |
| |
| /** |
| * Return the width of this layout. |
| */ |
| public final int getWidth() { |
| return mWidth; |
| } |
| |
| /** |
| * Return the width to which this Layout is ellipsizing, or |
| * {@link #getWidth} if it is not doing anything special. |
| */ |
| public int getEllipsizedWidth() { |
| return mWidth; |
| } |
| |
| /** |
| * Increase the width of this layout to the specified width. |
| * Be careful to use this only when you know it is appropriate— |
| * it does not cause the text to reflow to use the full new width. |
| */ |
| public final void increaseWidthTo(int wid) { |
| if (wid < mWidth) { |
| throw new RuntimeException("attempted to reduce Layout width"); |
| } |
| |
| mWidth = wid; |
| } |
| |
| /** |
| * Return the total height of this layout. |
| */ |
| public int getHeight() { |
| return getLineTop(getLineCount()); |
| } |
| |
| /** |
| * Return the total height of this layout. |
| * |
| * @param cap if true and max lines is set, returns the height of the layout at the max lines. |
| * |
| * @hide |
| */ |
| public int getHeight(boolean cap) { |
| return getHeight(); |
| } |
| |
| /** |
| * Return the base alignment of this layout. |
| */ |
| public final Alignment getAlignment() { |
| return mAlignment; |
| } |
| |
| /** |
| * Return what the text height is multiplied by to get the line height. |
| */ |
| public final float getSpacingMultiplier() { |
| return mSpacingMult; |
| } |
| |
| /** |
| * Return the number of units of leading that are added to each line. |
| */ |
| public final float getSpacingAdd() { |
| return mSpacingAdd; |
| } |
| |
| /** |
| * Return the heuristic used to determine paragraph text direction. |
| * @hide |
| */ |
| public final TextDirectionHeuristic getTextDirectionHeuristic() { |
| return mTextDir; |
| } |
| |
| /** |
| * Return the number of lines of text in this layout. |
| */ |
| public abstract int getLineCount(); |
| |
| /** |
| * Return the baseline for the specified line (0…getLineCount() - 1) |
| * If bounds is not null, return the top, left, right, bottom extents |
| * of the specified line in it. |
| * @param line which line to examine (0..getLineCount() - 1) |
| * @param bounds Optional. If not null, it returns the extent of the line |
| * @return the Y-coordinate of the baseline |
| */ |
| public int getLineBounds(int line, Rect bounds) { |
| if (bounds != null) { |
| bounds.left = 0; // ??? |
| bounds.top = getLineTop(line); |
| bounds.right = mWidth; // ??? |
| bounds.bottom = getLineTop(line + 1); |
| } |
| return getLineBaseline(line); |
| } |
| |
| /** |
| * Return the vertical position of the top of the specified line |
| * (0…getLineCount()). |
| * If the specified line is equal to the line count, returns the |
| * bottom of the last line. |
| */ |
| public abstract int getLineTop(int line); |
| |
| /** |
| * Return the descent of the specified line(0…getLineCount() - 1). |
| */ |
| public abstract int getLineDescent(int line); |
| |
| /** |
| * Return the text offset of the beginning of the specified line ( |
| * 0…getLineCount()). If the specified line is equal to the line |
| * count, returns the length of the text. |
| */ |
| public abstract int getLineStart(int line); |
| |
| /** |
| * Returns the primary directionality of the paragraph containing the |
| * specified line, either 1 for left-to-right lines, or -1 for right-to-left |
| * lines (see {@link #DIR_LEFT_TO_RIGHT}, {@link #DIR_RIGHT_TO_LEFT}). |
| */ |
| public abstract int getParagraphDirection(int line); |
| |
| /** |
| * Returns whether the specified line contains one or more |
| * characters that need to be handled specially, like tabs. |
| */ |
| public abstract boolean getLineContainsTab(int line); |
| |
| /** |
| * Returns the directional run information for the specified line. |
| * The array alternates counts of characters in left-to-right |
| * and right-to-left segments of the line. |
| * |
| * <p>NOTE: this is inadequate to support bidirectional text, and will change. |
| */ |
| public abstract Directions getLineDirections(int line); |
| |
| /** |
| * Returns the (negative) number of extra pixels of ascent padding in the |
| * top line of the Layout. |
| */ |
| public abstract int getTopPadding(); |
| |
| /** |
| * Returns the number of extra pixels of descent padding in the |
| * bottom line of the Layout. |
| */ |
| public abstract int getBottomPadding(); |
| |
| /** |
| * Returns the start hyphen edit for a line. |
| * |
| * @hide |
| */ |
| public @Paint.StartHyphenEdit int getStartHyphenEdit(int line) { |
| return Paint.START_HYPHEN_EDIT_NO_EDIT; |
| } |
| |
| /** |
| * Returns the end hyphen edit for a line. |
| * |
| * @hide |
| */ |
| public @Paint.EndHyphenEdit int getEndHyphenEdit(int line) { |
| return Paint.END_HYPHEN_EDIT_NO_EDIT; |
| } |
| |
| /** |
| * Returns the left indent for a line. |
| * |
| * @hide |
| */ |
| public int getIndentAdjust(int line, Alignment alignment) { |
| return 0; |
| } |
| |
| /** |
| * Returns true if the character at offset and the preceding character |
| * are at different run levels (and thus there's a split caret). |
| * @param offset the offset |
| * @return true if at a level boundary |
| * @hide |
| */ |
| @UnsupportedAppUsage |
| public boolean isLevelBoundary(int offset) { |
| int line = getLineForOffset(offset); |
| Directions dirs = getLineDirections(line); |
| if (dirs == DIRS_ALL_LEFT_TO_RIGHT || dirs == DIRS_ALL_RIGHT_TO_LEFT) { |
| return false; |
| } |
| |
| int[] runs = dirs.mDirections; |
| int lineStart = getLineStart(line); |
| int lineEnd = getLineEnd(line); |
| if (offset == lineStart || offset == lineEnd) { |
| int paraLevel = getParagraphDirection(line) == 1 ? 0 : 1; |
| int runIndex = offset == lineStart ? 0 : runs.length - 2; |
| return ((runs[runIndex + 1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK) != paraLevel; |
| } |
| |
| offset -= lineStart; |
| for (int i = 0; i < runs.length; i += 2) { |
| if (offset == runs[i]) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Returns true if the character at offset is right to left (RTL). |
| * @param offset the offset |
| * @return true if the character is RTL, false if it is LTR |
| */ |
| public boolean isRtlCharAt(int offset) { |
| int line = getLineForOffset(offset); |
| Directions dirs = getLineDirections(line); |
| if (dirs == DIRS_ALL_LEFT_TO_RIGHT) { |
| return false; |
| } |
| if (dirs == DIRS_ALL_RIGHT_TO_LEFT) { |
| return true; |
| } |
| int[] runs = dirs.mDirections; |
| int lineStart = getLineStart(line); |
| for (int i = 0; i < runs.length; i += 2) { |
| int start = lineStart + runs[i]; |
| int limit = start + (runs[i+1] & RUN_LENGTH_MASK); |
| if (offset >= start && offset < limit) { |
| int level = (runs[i+1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK; |
| return ((level & 1) != 0); |
| } |
| } |
| // Should happen only if the offset is "out of bounds" |
| return false; |
| } |
| |
| /** |
| * Returns the range of the run that the character at offset belongs to. |
| * @param offset the offset |
| * @return The range of the run |
| * @hide |
| */ |
| public long getRunRange(int offset) { |
| int line = getLineForOffset(offset); |
| Directions dirs = getLineDirections(line); |
| if (dirs == DIRS_ALL_LEFT_TO_RIGHT || dirs == DIRS_ALL_RIGHT_TO_LEFT) { |
| return TextUtils.packRangeInLong(0, getLineEnd(line)); |
| } |
| int[] runs = dirs.mDirections; |
| int lineStart = getLineStart(line); |
| for (int i = 0; i < runs.length; i += 2) { |
| int start = lineStart + runs[i]; |
| int limit = start + (runs[i+1] & RUN_LENGTH_MASK); |
| if (offset >= start && offset < limit) { |
| return TextUtils.packRangeInLong(start, limit); |
| } |
| } |
| // Should happen only if the offset is "out of bounds" |
| return TextUtils.packRangeInLong(0, getLineEnd(line)); |
| } |
| |
| /** |
| * Checks if the trailing BiDi level should be used for an offset |
| * |
| * This method is useful when the offset is at the BiDi level transition point and determine |
| * which run need to be used. For example, let's think about following input: (L* denotes |
| * Left-to-Right characters, R* denotes Right-to-Left characters.) |
| * Input (Logical Order): L1 L2 L3 R1 R2 R3 L4 L5 L6 |
| * Input (Display Order): L1 L2 L3 R3 R2 R1 L4 L5 L6 |
| * |
| * Then, think about selecting the range (3, 6). The offset=3 and offset=6 are ambiguous here |
| * since they are at the BiDi transition point. In Android, the offset is considered to be |
| * associated with the trailing run if the BiDi level of the trailing run is higher than of the |
| * previous run. In this case, the BiDi level of the input text is as follows: |
| * |
| * Input (Logical Order): L1 L2 L3 R1 R2 R3 L4 L5 L6 |
| * BiDi Run: [ Run 0 ][ Run 1 ][ Run 2 ] |
| * BiDi Level: 0 0 0 1 1 1 0 0 0 |
| * |
| * Thus, offset = 3 is part of Run 1 and this method returns true for offset = 3, since the BiDi |
| * level of Run 1 is higher than the level of Run 0. Similarly, the offset = 6 is a part of Run |
| * 1 and this method returns false for the offset = 6 since the BiDi level of Run 1 is higher |
| * than the level of Run 2. |
| * |
| * @returns true if offset is at the BiDi level transition point and trailing BiDi level is |
| * higher than previous BiDi level. See above for the detail. |
| * @hide |
| */ |
| @VisibleForTesting |
| public boolean primaryIsTrailingPrevious(int offset) { |
| int line = getLineForOffset(offset); |
| int lineStart = getLineStart(line); |
| int lineEnd = getLineEnd(line); |
| int[] runs = getLineDirections(line).mDirections; |
| |
| int levelAt = -1; |
| for (int i = 0; i < runs.length; i += 2) { |
| int start = lineStart + runs[i]; |
| int limit = start + (runs[i+1] & RUN_LENGTH_MASK); |
| if (limit > lineEnd) { |
| limit = lineEnd; |
| } |
| if (offset >= start && offset < limit) { |
| if (offset > start) { |
| // Previous character is at same level, so don't use trailing. |
| return false; |
| } |
| levelAt = (runs[i+1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK; |
| break; |
| } |
| } |
| if (levelAt == -1) { |
| // Offset was limit of line. |
| levelAt = getParagraphDirection(line) == 1 ? 0 : 1; |
| } |
| |
| // At level boundary, check previous level. |
| int levelBefore = -1; |
| if (offset == lineStart) { |
| levelBefore = getParagraphDirection(line) == 1 ? 0 : 1; |
| } else { |
| offset -= 1; |
| for (int i = 0; i < runs.length; i += 2) { |
| int start = lineStart + runs[i]; |
| int limit = start + (runs[i+1] & RUN_LENGTH_MASK); |
| if (limit > lineEnd) { |
| limit = lineEnd; |
| } |
| if (offset >= start && offset < limit) { |
| levelBefore = (runs[i+1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK; |
| break; |
| } |
| } |
| } |
| |
| return levelBefore < levelAt; |
| } |
| |
| /** |
| * Computes in linear time the results of calling |
| * #primaryIsTrailingPrevious for all offsets on a line. |
| * @param line The line giving the offsets we compute the information for |
| * @return The array of results, indexed from 0, where 0 corresponds to the line start offset |
| * @hide |
| */ |
| @VisibleForTesting |
| public boolean[] primaryIsTrailingPreviousAllLineOffsets(int line) { |
| int lineStart = getLineStart(line); |
| int lineEnd = getLineEnd(line); |
| int[] runs = getLineDirections(line).mDirections; |
| |
| boolean[] trailing = new boolean[lineEnd - lineStart + 1]; |
| |
| byte[] level = new byte[lineEnd - lineStart + 1]; |
| for (int i = 0; i < runs.length; i += 2) { |
| int start = lineStart + runs[i]; |
| int limit = start + (runs[i + 1] & RUN_LENGTH_MASK); |
| if (limit > lineEnd) { |
| limit = lineEnd; |
| } |
| level[limit - lineStart - 1] = |
| (byte) ((runs[i + 1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK); |
| } |
| |
| for (int i = 0; i < runs.length; i += 2) { |
| int start = lineStart + runs[i]; |
| byte currentLevel = (byte) ((runs[i + 1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK); |
| trailing[start - lineStart] = currentLevel > (start == lineStart |
| ? (getParagraphDirection(line) == 1 ? 0 : 1) |
| : level[start - lineStart - 1]); |
| } |
| |
| return trailing; |
| } |
| |
| /** |
| * Get the primary horizontal position for the specified text offset. |
| * This is the location where a new character would be inserted in |
| * the paragraph's primary direction. |
| */ |
| public float getPrimaryHorizontal(int offset) { |
| return getPrimaryHorizontal(offset, false /* not clamped */); |
| } |
| |
| /** |
| * Get the primary horizontal position for the specified text offset, but |
| * optionally clamp it so that it doesn't exceed the width of the layout. |
| * @hide |
| */ |
| @UnsupportedAppUsage |
| public float getPrimaryHorizontal(int offset, boolean clamped) { |
| boolean trailing = primaryIsTrailingPrevious(offset); |
| return getHorizontal(offset, trailing, clamped); |
| } |
| |
| /** |
| * Get the secondary horizontal position for the specified text offset. |
| * This is the location where a new character would be inserted in |
| * the direction other than the paragraph's primary direction. |
| */ |
| public float getSecondaryHorizontal(int offset) { |
| return getSecondaryHorizontal(offset, false /* not clamped */); |
| } |
| |
| /** |
| * Get the secondary horizontal position for the specified text offset, but |
| * optionally clamp it so that it doesn't exceed the width of the layout. |
| * @hide |
| */ |
| @UnsupportedAppUsage |
| public float getSecondaryHorizontal(int offset, boolean clamped) { |
| boolean trailing = primaryIsTrailingPrevious(offset); |
| return getHorizontal(offset, !trailing, clamped); |
| } |
| |
| private float getHorizontal(int offset, boolean primary) { |
| return primary ? getPrimaryHorizontal(offset) : getSecondaryHorizontal(offset); |
| } |
| |
| private float getHorizontal(int offset, boolean trailing, boolean clamped) { |
| int line = getLineForOffset(offset); |
| |
| return getHorizontal(offset, trailing, line, clamped); |
| } |
| |
| private float getHorizontal(int offset, boolean trailing, int line, boolean clamped) { |
| int start = getLineStart(line); |
| int end = getLineEnd(line); |
| int dir = getParagraphDirection(line); |
| boolean hasTab = getLineContainsTab(line); |
| Directions directions = getLineDirections(line); |
| |
| TabStops tabStops = null; |
| if (hasTab && mText instanceof Spanned) { |
| // Just checking this line should be good enough, tabs should be |
| // consistent across all lines in a paragraph. |
| TabStopSpan[] tabs = getParagraphSpans((Spanned) mText, start, end, TabStopSpan.class); |
| if (tabs.length > 0) { |
| tabStops = new TabStops(TAB_INCREMENT, tabs); // XXX should reuse |
| } |
| } |
| |
| TextLine tl = TextLine.obtain(); |
| tl.set(mPaint, mText, start, end, dir, directions, hasTab, tabStops, |
| getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line)); |
| float wid = tl.measure(offset - start, trailing, null); |
| TextLine.recycle(tl); |
| |
| if (clamped && wid > mWidth) { |
| wid = mWidth; |
| } |
| int left = getParagraphLeft(line); |
| int right = getParagraphRight(line); |
| |
| return getLineStartPos(line, left, right) + wid; |
| } |
| |
| /** |
| * Computes in linear time the results of calling |
| * #getHorizontal for all offsets on a line. |
| * @param line The line giving the offsets we compute information for |
| * @param clamped Whether to clamp the results to the width of the layout |
| * @param primary Whether the results should be the primary or the secondary horizontal |
| * @return The array of results, indexed from 0, where 0 corresponds to the line start offset |
| */ |
| private float[] getLineHorizontals(int line, boolean clamped, boolean primary) { |
| int start = getLineStart(line); |
| int end = getLineEnd(line); |
| int dir = getParagraphDirection(line); |
| boolean hasTab = getLineContainsTab(line); |
| Directions directions = getLineDirections(line); |
| |
| TabStops tabStops = null; |
| if (hasTab && mText instanceof Spanned) { |
| // Just checking this line should be good enough, tabs should be |
| // consistent across all lines in a paragraph. |
| TabStopSpan[] tabs = getParagraphSpans((Spanned) mText, start, end, TabStopSpan.class); |
| if (tabs.length > 0) { |
| tabStops = new TabStops(TAB_INCREMENT, tabs); // XXX should reuse |
| } |
| } |
| |
| TextLine tl = TextLine.obtain(); |
| tl.set(mPaint, mText, start, end, dir, directions, hasTab, tabStops, |
| getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line)); |
| boolean[] trailings = primaryIsTrailingPreviousAllLineOffsets(line); |
| if (!primary) { |
| for (int offset = 0; offset < trailings.length; ++offset) { |
| trailings[offset] = !trailings[offset]; |
| } |
| } |
| float[] wid = tl.measureAllOffsets(trailings, null); |
| TextLine.recycle(tl); |
| |
| if (clamped) { |
| for (int offset = 0; offset <= wid.length; ++offset) { |
| if (wid[offset] > mWidth) { |
| wid[offset] = mWidth; |
| } |
| } |
| } |
| int left = getParagraphLeft(line); |
| int right = getParagraphRight(line); |
| |
| int lineStartPos = getLineStartPos(line, left, right); |
| float[] horizontal = new float[end - start + 1]; |
| for (int offset = 0; offset < horizontal.length; ++offset) { |
| horizontal[offset] = lineStartPos + wid[offset]; |
| } |
| return horizontal; |
| } |
| |
| /** |
| * Get the leftmost position that should be exposed for horizontal |
| * scrolling on the specified line. |
| */ |
| public float getLineLeft(int line) { |
| final int dir = getParagraphDirection(line); |
| Alignment align = getParagraphAlignment(line); |
| // Before Q, StaticLayout.Builder.setAlignment didn't check whether the input alignment |
| // is null. And when it is null, the old behavior is the same as ALIGN_CENTER. |
| // To keep consistency, we convert a null alignment to ALIGN_CENTER. |
| if (align == null) { |
| align = Alignment.ALIGN_CENTER; |
| } |
| |
| // First convert combinations of alignment and direction settings to |
| // three basic cases: ALIGN_LEFT, ALIGN_RIGHT and ALIGN_CENTER. |
| // For unexpected cases, it will fallback to ALIGN_LEFT. |
| final Alignment resultAlign; |
| switch(align) { |
| case ALIGN_NORMAL: |
| resultAlign = |
| dir == DIR_RIGHT_TO_LEFT ? Alignment.ALIGN_RIGHT : Alignment.ALIGN_LEFT; |
| break; |
| case ALIGN_OPPOSITE: |
| resultAlign = |
| dir == DIR_RIGHT_TO_LEFT ? Alignment.ALIGN_LEFT : Alignment.ALIGN_RIGHT; |
| break; |
| case ALIGN_CENTER: |
| resultAlign = Alignment.ALIGN_CENTER; |
| break; |
| case ALIGN_RIGHT: |
| resultAlign = Alignment.ALIGN_RIGHT; |
| break; |
| default: /* align == Alignment.ALIGN_LEFT */ |
| resultAlign = Alignment.ALIGN_LEFT; |
| } |
| |
| // Here we must use getLineMax() to do the computation, because it maybe overridden by |
| // derived class. And also note that line max equals the width of the text in that line |
| // plus the leading margin. |
| switch (resultAlign) { |
| case ALIGN_CENTER: |
| final int left = getParagraphLeft(line); |
| final float max = getLineMax(line); |
| // This computation only works when mWidth equals leadingMargin plus |
| // the width of text in this line. If this condition doesn't meet anymore, |
| // please change here too. |
| return (float) Math.floor(left + (mWidth - max) / 2); |
| case ALIGN_RIGHT: |
| return mWidth - getLineMax(line); |
| default: /* resultAlign == Alignment.ALIGN_LEFT */ |
| return 0; |
| } |
| } |
| |
| /** |
| * Get the rightmost position that should be exposed for horizontal |
| * scrolling on the specified line. |
| */ |
| public float getLineRight(int line) { |
| final int dir = getParagraphDirection(line); |
| Alignment align = getParagraphAlignment(line); |
| // Before Q, StaticLayout.Builder.setAlignment didn't check whether the input alignment |
| // is null. And when it is null, the old behavior is the same as ALIGN_CENTER. |
| // To keep consistency, we convert a null alignment to ALIGN_CENTER. |
| if (align == null) { |
| align = Alignment.ALIGN_CENTER; |
| } |
| |
| final Alignment resultAlign; |
| switch(align) { |
| case ALIGN_NORMAL: |
| resultAlign = |
| dir == DIR_RIGHT_TO_LEFT ? Alignment.ALIGN_RIGHT : Alignment.ALIGN_LEFT; |
| break; |
| case ALIGN_OPPOSITE: |
| resultAlign = |
| dir == DIR_RIGHT_TO_LEFT ? Alignment.ALIGN_LEFT : Alignment.ALIGN_RIGHT; |
| break; |
| case ALIGN_CENTER: |
| resultAlign = Alignment.ALIGN_CENTER; |
| break; |
| case ALIGN_RIGHT: |
| resultAlign = Alignment.ALIGN_RIGHT; |
| break; |
| default: /* align == Alignment.ALIGN_LEFT */ |
| resultAlign = Alignment.ALIGN_LEFT; |
| } |
| |
| switch (resultAlign) { |
| case ALIGN_CENTER: |
| final int right = getParagraphRight(line); |
| final float max = getLineMax(line); |
| // This computation only works when mWidth equals leadingMargin plus width of the |
| // text in this line. If this condition doesn't meet anymore, please change here. |
| return (float) Math.ceil(right - (mWidth - max) / 2); |
| case ALIGN_RIGHT: |
| return mWidth; |
| default: /* resultAlign == Alignment.ALIGN_LEFT */ |
| return getLineMax(line); |
| } |
| } |
| |
| /** |
| * Gets the unsigned horizontal extent of the specified line, including |
| * leading margin indent, but excluding trailing whitespace. |
| */ |
| public float getLineMax(int line) { |
| float margin = getParagraphLeadingMargin(line); |
| float signedExtent = getLineExtent(line, false); |
| return margin + (signedExtent >= 0 ? signedExtent : -signedExtent); |
| } |
| |
| /** |
| * Gets the unsigned horizontal extent of the specified line, including |
| * leading margin indent and trailing whitespace. |
| */ |
| public float getLineWidth(int line) { |
| float margin = getParagraphLeadingMargin(line); |
| float signedExtent = getLineExtent(line, true); |
| return margin + (signedExtent >= 0 ? signedExtent : -signedExtent); |
| } |
| |
| /** |
| * Like {@link #getLineExtent(int,TabStops,boolean)} but determines the |
| * tab stops instead of using the ones passed in. |
| * @param line the index of the line |
| * @param full whether to include trailing whitespace |
| * @return the extent of the line |
| */ |
| private float getLineExtent(int line, boolean full) { |
| final int start = getLineStart(line); |
| final int end = full ? getLineEnd(line) : getLineVisibleEnd(line); |
| |
| final boolean hasTabs = getLineContainsTab(line); |
| TabStops tabStops = null; |
| if (hasTabs && mText instanceof Spanned) { |
| // Just checking this line should be good enough, tabs should be |
| // consistent across all lines in a paragraph. |
| TabStopSpan[] tabs = getParagraphSpans((Spanned) mText, start, end, TabStopSpan.class); |
| if (tabs.length > 0) { |
| tabStops = new TabStops(TAB_INCREMENT, tabs); // XXX should reuse |
| } |
| } |
| final Directions directions = getLineDirections(line); |
| // Returned directions can actually be null |
| if (directions == null) { |
| return 0f; |
| } |
| final int dir = getParagraphDirection(line); |
| |
| final TextLine tl = TextLine.obtain(); |
| final TextPaint paint = mWorkPaint; |
| paint.set(mPaint); |
| paint.setStartHyphenEdit(getStartHyphenEdit(line)); |
| paint.setEndHyphenEdit(getEndHyphenEdit(line)); |
| tl.set(paint, mText, start, end, dir, directions, hasTabs, tabStops, |
| getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line)); |
| if (isJustificationRequired(line)) { |
| tl.justify(getJustifyWidth(line)); |
| } |
| final float width = tl.metrics(null); |
| TextLine.recycle(tl); |
| return width; |
| } |
| |
| /** |
| * Returns the signed horizontal extent of the specified line, excluding |
| * leading margin. If full is false, excludes trailing whitespace. |
| * @param line the index of the line |
| * @param tabStops the tab stops, can be null if we know they're not used. |
| * @param full whether to include trailing whitespace |
| * @return the extent of the text on this line |
| */ |
| private float getLineExtent(int line, TabStops tabStops, boolean full) { |
| final int start = getLineStart(line); |
| final int end = full ? getLineEnd(line) : getLineVisibleEnd(line); |
| final boolean hasTabs = getLineContainsTab(line); |
| final Directions directions = getLineDirections(line); |
| final int dir = getParagraphDirection(line); |
| |
| final TextLine tl = TextLine.obtain(); |
| final TextPaint paint = mWorkPaint; |
| paint.set(mPaint); |
| paint.setStartHyphenEdit(getStartHyphenEdit(line)); |
| paint.setEndHyphenEdit(getEndHyphenEdit(line)); |
| tl.set(paint, mText, start, end, dir, directions, hasTabs, tabStops, |
| getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line)); |
| if (isJustificationRequired(line)) { |
| tl.justify(getJustifyWidth(line)); |
| } |
| final float width = tl.metrics(null); |
| TextLine.recycle(tl); |
| return width; |
| } |
| |
| /** |
| * Get the line number corresponding to the specified vertical position. |
| * If you ask for a position above 0, you get 0; if you ask for a position |
| * below the bottom of the text, you get the last line. |
| */ |
| // FIXME: It may be faster to do a linear search for layouts without many lines. |
| public int getLineForVertical(int vertical) { |
| int high = getLineCount(), low = -1, guess; |
| |
| while (high - low > 1) { |
| guess = (high + low) / 2; |
| |
| if (getLineTop(guess) > vertical) |
| high = guess; |
| else |
| low = guess; |
| } |
| |
| if (low < 0) |
| return 0; |
| else |
| return low; |
| } |
| |
| /** |
| * Get the line number on which the specified text offset appears. |
| * If you ask for a position before 0, you get 0; if you ask for a position |
| * beyond the end of the text, you get the last line. |
| */ |
| public int getLineForOffset(int offset) { |
| int high = getLineCount(), low = -1, guess; |
| |
| while (high - low > 1) { |
| guess = (high + low) / 2; |
| |
| if (getLineStart(guess) > offset) |
| high = guess; |
| else |
| low = guess; |
| } |
| |
| if (low < 0) { |
| return 0; |
| } else { |
| return low; |
| } |
| } |
| |
| /** |
| * Get the character offset on the specified line whose position is |
| * closest to the specified horizontal position. |
| */ |
| public int getOffsetForHorizontal(int line, float horiz) { |
| return getOffsetForHorizontal(line, horiz, true); |
| } |
| |
| /** |
| * Get the character offset on the specified line whose position is |
| * closest to the specified horizontal position. |
| * |
| * @param line the line used to find the closest offset |
| * @param horiz the horizontal position used to find the closest offset |
| * @param primary whether to use the primary position or secondary position to find the offset |
| * |
| * @hide |
| */ |
| public int getOffsetForHorizontal(int line, float horiz, boolean primary) { |
| // TODO: use Paint.getOffsetForAdvance to avoid binary search |
| final int lineEndOffset = getLineEnd(line); |
| final int lineStartOffset = getLineStart(line); |
| |
| Directions dirs = getLineDirections(line); |
| |
| TextLine tl = TextLine.obtain(); |
| // XXX: we don't care about tabs as we just use TextLine#getOffsetToLeftRightOf here. |
| tl.set(mPaint, mText, lineStartOffset, lineEndOffset, getParagraphDirection(line), dirs, |
| false, null, |
| getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line)); |
| final HorizontalMeasurementProvider horizontal = |
| new HorizontalMeasurementProvider(line, primary); |
| |
| final int max; |
| if (line == getLineCount() - 1) { |
| max = lineEndOffset; |
| } else { |
| max = tl.getOffsetToLeftRightOf(lineEndOffset - lineStartOffset, |
| !isRtlCharAt(lineEndOffset - 1)) + lineStartOffset; |
| } |
| int best = lineStartOffset; |
| float bestdist = Math.abs(horizontal.get(lineStartOffset) - horiz); |
| |
| for (int i = 0; i < dirs.mDirections.length; i += 2) { |
| int here = lineStartOffset + dirs.mDirections[i]; |
| int there = here + (dirs.mDirections[i+1] & RUN_LENGTH_MASK); |
| boolean isRtl = (dirs.mDirections[i+1] & RUN_RTL_FLAG) != 0; |
| int swap = isRtl ? -1 : 1; |
| |
| if (there > max) |
| there = max; |
| int high = there - 1 + 1, low = here + 1 - 1, guess; |
| |
| while (high - low > 1) { |
| guess = (high + low) / 2; |
| int adguess = getOffsetAtStartOf(guess); |
| |
| if (horizontal.get(adguess) * swap >= horiz * swap) { |
| high = guess; |
| } else { |
| low = guess; |
| } |
| } |
| |
| if (low < here + 1) |
| low = here + 1; |
| |
| if (low < there) { |
| int aft = tl.getOffsetToLeftRightOf(low - lineStartOffset, isRtl) + lineStartOffset; |
| low = tl.getOffsetToLeftRightOf(aft - lineStartOffset, !isRtl) + lineStartOffset; |
| if (low >= here && low < there) { |
| float dist = Math.abs(horizontal.get(low) - horiz); |
| if (aft < there) { |
| float other = Math.abs(horizontal.get(aft) - horiz); |
| |
| if (other < dist) { |
| dist = other; |
| low = aft; |
| } |
| } |
| |
| if (dist < bestdist) { |
| bestdist = dist; |
| best = low; |
| } |
| } |
| } |
| |
| float dist = Math.abs(horizontal.get(here) - horiz); |
| |
| if (dist < bestdist) { |
| bestdist = dist; |
| best = here; |
| } |
| } |
| |
| float dist = Math.abs(horizontal.get(max) - horiz); |
| |
| if (dist <= bestdist) { |
| best = max; |
| } |
| |
| TextLine.recycle(tl); |
| return best; |
| } |
| |
| /** |
| * Responds to #getHorizontal queries, by selecting the better strategy between: |
| * - calling #getHorizontal explicitly for each query |
| * - precomputing all #getHorizontal measurements, and responding to any query in constant time |
| * The first strategy is used for LTR-only text, while the second is used for all other cases. |
| * The class is currently only used in #getOffsetForHorizontal, so reuse with care in other |
| * contexts. |
| */ |
| private class HorizontalMeasurementProvider { |
| private final int mLine; |
| private final boolean mPrimary; |
| |
| private float[] mHorizontals; |
| private int mLineStartOffset; |
| |
| HorizontalMeasurementProvider(final int line, final boolean primary) { |
| mLine = line; |
| mPrimary = primary; |
| init(); |
| } |
| |
| private void init() { |
| final Directions dirs = getLineDirections(mLine); |
| if (dirs == DIRS_ALL_LEFT_TO_RIGHT) { |
| return; |
| } |
| |
| mHorizontals = getLineHorizontals(mLine, false, mPrimary); |
| mLineStartOffset = getLineStart(mLine); |
| } |
| |
| float get(final int offset) { |
| final int index = offset - mLineStartOffset; |
| if (mHorizontals == null || index < 0 || index >= mHorizontals.length) { |
| return getHorizontal(offset, mPrimary); |
| } else { |
| return mHorizontals[index]; |
| } |
| } |
| } |
| |
| /** |
| * Return the text offset after the last character on the specified line. |
| */ |
| public final int getLineEnd(int line) { |
| return getLineStart(line + 1); |
| } |
| |
| /** |
| * Return the text offset after the last visible character (so whitespace |
| * is not counted) on the specified line. |
| */ |
| public int getLineVisibleEnd(int line) { |
| return getLineVisibleEnd(line, getLineStart(line), getLineStart(line+1)); |
| } |
| |
| private int getLineVisibleEnd(int line, int start, int end) { |
| CharSequence text = mText; |
| char ch; |
| if (line == getLineCount() - 1) { |
| return end; |
| } |
| |
| for (; end > start; end--) { |
| ch = text.charAt(end - 1); |
| |
| if (ch == '\n') { |
| return end - 1; |
| } |
| |
| if (!TextLine.isLineEndSpace(ch)) { |
| break; |
| } |
| |
| } |
| |
| return end; |
| } |
| |
| /** |
| * Return the vertical position of the bottom of the specified line. |
| */ |
| public final int getLineBottom(int line) { |
| return getLineTop(line + 1); |
| } |
| |
| /** |
| * Return the vertical position of the bottom of the specified line without the line spacing |
| * added. |
| * |
| * @hide |
| */ |
| public final int getLineBottomWithoutSpacing(int line) { |
| return getLineTop(line + 1) - getLineExtra(line); |
| } |
| |
| /** |
| * Return the vertical position of the baseline of the specified line. |
| */ |
| public final int getLineBaseline(int line) { |
| // getLineTop(line+1) == getLineBottom(line) |
| return getLineTop(line+1) - getLineDescent(line); |
| } |
| |
| /** |
| * Get the ascent of the text on the specified line. |
| * The return value is negative to match the Paint.ascent() convention. |
| */ |
| public final int getLineAscent(int line) { |
| // getLineTop(line+1) - getLineDescent(line) == getLineBaseLine(line) |
| return getLineTop(line) - (getLineTop(line+1) - getLineDescent(line)); |
| } |
| |
| /** |
| * Return the extra space added as a result of line spacing attributes |
| * {@link #getSpacingAdd()} and {@link #getSpacingMultiplier()}. Default value is {@code zero}. |
| * |
| * @param line the index of the line, the value should be equal or greater than {@code zero} |
| * @hide |
| */ |
| public int getLineExtra(@IntRange(from = 0) int line) { |
| return 0; |
| } |
| |
| public int getOffsetToLeftOf(int offset) { |
| return getOffsetToLeftRightOf(offset, true); |
| } |
| |
| public int getOffsetToRightOf(int offset) { |
| return getOffsetToLeftRightOf(offset, false); |
| } |
| |
| private int getOffsetToLeftRightOf(int caret, boolean toLeft) { |
| int line = getLineForOffset(caret); |
| int lineStart = getLineStart(line); |
| int lineEnd = getLineEnd(line); |
| int lineDir = getParagraphDirection(line); |
| |
| boolean lineChanged = false; |
| boolean advance = toLeft == (lineDir == DIR_RIGHT_TO_LEFT); |
| // if walking off line, look at the line we're headed to |
| if (advance) { |
| if (caret == lineEnd) { |
| if (line < getLineCount() - 1) { |
| lineChanged = true; |
| ++line; |
| } else { |
| return caret; // at very end, don't move |
| } |
| } |
| } else { |
| if (caret == lineStart) { |
| if (line > 0) { |
| lineChanged = true; |
| --line; |
| } else { |
| return caret; // at very start, don't move |
| } |
| } |
| } |
| |
| if (lineChanged) { |
| lineStart = getLineStart(line); |
| lineEnd = getLineEnd(line); |
| int newDir = getParagraphDirection(line); |
| if (newDir != lineDir) { |
| // unusual case. we want to walk onto the line, but it runs |
| // in a different direction than this one, so we fake movement |
| // in the opposite direction. |
| toLeft = !toLeft; |
| lineDir = newDir; |
| } |
| } |
| |
| Directions directions = getLineDirections(line); |
| |
| TextLine tl = TextLine.obtain(); |
| // XXX: we don't care about tabs |
| tl.set(mPaint, mText, lineStart, lineEnd, lineDir, directions, false, null, |
| getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line)); |
| caret = lineStart + tl.getOffsetToLeftRightOf(caret - lineStart, toLeft); |
| TextLine.recycle(tl); |
| return caret; |
| } |
| |
| private int getOffsetAtStartOf(int offset) { |
| // XXX this probably should skip local reorderings and |
| // zero-width characters, look at callers |
| if (offset == 0) |
| return 0; |
| |
| CharSequence text = mText; |
| char c = text.charAt(offset); |
| |
| if (c >= '\uDC00' && c <= '\uDFFF') { |
| char c1 = text.charAt(offset - 1); |
| |
| if (c1 >= '\uD800' && c1 <= '\uDBFF') |
| offset -= 1; |
| } |
| |
| if (mSpannedText) { |
| ReplacementSpan[] spans = ((Spanned) text).getSpans(offset, offset, |
| ReplacementSpan.class); |
| |
| for (int i = 0; i < spans.length; i++) { |
| int start = ((Spanned) text).getSpanStart(spans[i]); |
| int end = ((Spanned) text).getSpanEnd(spans[i]); |
| |
| if (start < offset && end > offset) |
| offset = start; |
| } |
| } |
| |
| return offset; |
| } |
| |
| /** |
| * Determine whether we should clamp cursor position. Currently it's |
| * only robust for left-aligned displays. |
| * @hide |
| */ |
| @UnsupportedAppUsage |
| public boolean shouldClampCursor(int line) { |
| // Only clamp cursor position in left-aligned displays. |
| switch (getParagraphAlignment(line)) { |
| case ALIGN_LEFT: |
| return true; |
| case ALIGN_NORMAL: |
| return getParagraphDirection(line) > 0; |
| default: |
| return false; |
| } |
| |
| } |
| |
| /** |
| * Fills in the specified Path with a representation of a cursor |
| * at the specified offset. This will often be a vertical line |
| * but can be multiple discontinuous lines in text with multiple |
| * directionalities. |
| */ |
| public void getCursorPath(final int point, final Path dest, final CharSequence editingBuffer) { |
| dest.reset(); |
| |
| int line = getLineForOffset(point); |
| int top = getLineTop(line); |
| int bottom = getLineBottomWithoutSpacing(line); |
| |
| boolean clamped = shouldClampCursor(line); |
| float h1 = getPrimaryHorizontal(point, clamped) - 0.5f; |
| |
| int caps = TextKeyListener.getMetaState(editingBuffer, TextKeyListener.META_SHIFT_ON) | |
| TextKeyListener.getMetaState(editingBuffer, TextKeyListener.META_SELECTING); |
| int fn = TextKeyListener.getMetaState(editingBuffer, TextKeyListener.META_ALT_ON); |
| int dist = 0; |
| |
| if (caps != 0 || fn != 0) { |
| dist = (bottom - top) >> 2; |
| |
| if (fn != 0) |
| top += dist; |
| if (caps != 0) |
| bottom -= dist; |
| } |
| |
| if (h1 < 0.5f) |
| h1 = 0.5f; |
| |
| dest.moveTo(h1, top); |
| dest.lineTo(h1, bottom); |
| |
| if (caps == 2) { |
| dest.moveTo(h1, bottom); |
| dest.lineTo(h1 - dist, bottom + dist); |
| dest.lineTo(h1, bottom); |
| dest.lineTo(h1 + dist, bottom + dist); |
| } else if (caps == 1) { |
| dest.moveTo(h1, bottom); |
| dest.lineTo(h1 - dist, bottom + dist); |
| |
| dest.moveTo(h1 - dist, bottom + dist - 0.5f); |
| dest.lineTo(h1 + dist, bottom + dist - 0.5f); |
| |
| dest.moveTo(h1 + dist, bottom + dist); |
| dest.lineTo(h1, bottom); |
| } |
| |
| if (fn == 2) { |
| dest.moveTo(h1, top); |
| dest.lineTo(h1 - dist, top - dist); |
| dest.lineTo(h1, top); |
| dest.lineTo(h1 + dist, top - dist); |
| } else if (fn == 1) { |
| dest.moveTo(h1, top); |
| dest.lineTo(h1 - dist, top - dist); |
| |
| dest.moveTo(h1 - dist, top - dist + 0.5f); |
| dest.lineTo(h1 + dist, top - dist + 0.5f); |
| |
| dest.moveTo(h1 + dist, top - dist); |
| dest.lineTo(h1, top); |
| } |
| } |
| |
| private void addSelection(int line, int start, int end, |
| int top, int bottom, SelectionRectangleConsumer consumer) { |
| int linestart = getLineStart(line); |
| int lineend = getLineEnd(line); |
| Directions dirs = getLineDirections(line); |
| |
| if (lineend > linestart && mText.charAt(lineend - 1) == '\n') { |
| lineend--; |
| } |
| |
| for (int i = 0; i < dirs.mDirections.length; i += 2) { |
| int here = linestart + dirs.mDirections[i]; |
| int there = here + (dirs.mDirections[i + 1] & RUN_LENGTH_MASK); |
| |
| if (there > lineend) { |
| there = lineend; |
| } |
| |
| if (start <= there && end >= here) { |
| int st = Math.max(start, here); |
| int en = Math.min(end, there); |
| |
| if (st != en) { |
| float h1 = getHorizontal(st, false, line, false /* not clamped */); |
| float h2 = getHorizontal(en, true, line, false /* not clamped */); |
| |
| float left = Math.min(h1, h2); |
| float right = Math.max(h1, h2); |
| |
| final @TextSelectionLayout int layout = |
| ((dirs.mDirections[i + 1] & RUN_RTL_FLAG) != 0) |
| ? TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT |
| : TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT; |
| |
| consumer.accept(left, top, right, bottom, layout); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Fills in the specified Path with a representation of a highlight |
| * between the specified offsets. This will often be a rectangle |
| * or a potentially discontinuous set of rectangles. If the start |
| * and end are the same, the returned path is empty. |
| */ |
| public void getSelectionPath(int start, int end, Path dest) { |
| dest.reset(); |
| getSelection(start, end, (left, top, right, bottom, textSelectionLayout) -> |
| dest.addRect(left, top, right, bottom, Path.Direction.CW)); |
| } |
| |
| /** |
| * Calculates the rectangles which should be highlighted to indicate a selection between start |
| * and end and feeds them into the given {@link SelectionRectangleConsumer}. |
| * |
| * @param start the starting index of the selection |
| * @param end the ending index of the selection |
| * @param consumer the {@link SelectionRectangleConsumer} which will receive the generated |
| * rectangles. It will be called every time a rectangle is generated. |
| * @hide |
| * @see #getSelectionPath(int, int, Path) |
| */ |
| public final void getSelection(int start, int end, final SelectionRectangleConsumer consumer) { |
| if (start == end) { |
| return; |
| } |
| |
| if (end < start) { |
| int temp = end; |
| end = start; |
| start = temp; |
| } |
| |
| final int startline = getLineForOffset(start); |
| final int endline = getLineForOffset(end); |
| |
| int top = getLineTop(startline); |
| int bottom = getLineBottomWithoutSpacing(endline); |
| |
| if (startline == endline) { |
| addSelection(startline, start, end, top, bottom, consumer); |
| } else { |
| final float width = mWidth; |
| |
| addSelection(startline, start, getLineEnd(startline), |
| top, getLineBottom(startline), consumer); |
| |
| if (getParagraphDirection(startline) == DIR_RIGHT_TO_LEFT) { |
| consumer.accept(getLineLeft(startline), top, 0, getLineBottom(startline), |
| TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT); |
| } else { |
| consumer.accept(getLineRight(startline), top, width, getLineBottom(startline), |
| TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT); |
| } |
| |
| for (int i = startline + 1; i < endline; i++) { |
| top = getLineTop(i); |
| bottom = getLineBottom(i); |
| if (getParagraphDirection(i) == DIR_RIGHT_TO_LEFT) { |
| consumer.accept(0, top, width, bottom, TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT); |
| } else { |
| consumer.accept(0, top, width, bottom, TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT); |
| } |
| } |
| |
| top = getLineTop(endline); |
| bottom = getLineBottomWithoutSpacing(endline); |
| |
| addSelection(endline, getLineStart(endline), end, top, bottom, consumer); |
| |
| if (getParagraphDirection(endline) == DIR_RIGHT_TO_LEFT) { |
| consumer.accept(width, top, getLineRight(endline), bottom, |
| TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT); |
| } else { |
| consumer.accept(0, top, getLineLeft(endline), bottom, |
| TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT); |
| } |
| } |
| } |
| |
| /** |
| * Get the alignment of the specified paragraph, taking into account |
| * markup attached to it. |
| */ |
| public final Alignment getParagraphAlignment(int line) { |
| Alignment align = mAlignment; |
| |
| if (mSpannedText) { |
| Spanned sp = (Spanned) mText; |
| AlignmentSpan[] spans = getParagraphSpans(sp, getLineStart(line), |
| getLineEnd(line), |
| AlignmentSpan.class); |
| |
| int spanLength = spans.length; |
| if (spanLength > 0) { |
| align = spans[spanLength-1].getAlignment(); |
| } |
| } |
| |
| return align; |
| } |
| |
| /** |
| * Get the left edge of the specified paragraph, inset by left margins. |
| */ |
| public final int getParagraphLeft(int line) { |
| int left = 0; |
| int dir = getParagraphDirection(line); |
| if (dir == DIR_RIGHT_TO_LEFT || !mSpannedText) { |
| return left; // leading margin has no impact, or no styles |
| } |
| return getParagraphLeadingMargin(line); |
| } |
| |
| /** |
| * Get the right edge of the specified paragraph, inset by right margins. |
| */ |
| public final int getParagraphRight(int line) { |
| int right = mWidth; |
| int dir = getParagraphDirection(line); |
| if (dir == DIR_LEFT_TO_RIGHT || !mSpannedText) { |
| return right; // leading margin has no impact, or no styles |
| } |
| return right - getParagraphLeadingMargin(line); |
| } |
| |
| /** |
| * Returns the effective leading margin (unsigned) for this line, |
| * taking into account LeadingMarginSpan and LeadingMarginSpan2. |
| * @param line the line index |
| * @return the leading margin of this line |
| */ |
| private int getParagraphLeadingMargin(int line) { |
| if (!mSpannedText) { |
| return 0; |
| } |
| Spanned spanned = (Spanned) mText; |
| |
| int lineStart = getLineStart(line); |
| int lineEnd = getLineEnd(line); |
| int spanEnd = spanned.nextSpanTransition(lineStart, lineEnd, |
| LeadingMarginSpan.class); |
| LeadingMarginSpan[] spans = getParagraphSpans(spanned, lineStart, spanEnd, |
| LeadingMarginSpan.class); |
| if (spans.length == 0) { |
| return 0; // no leading margin span; |
| } |
| |
| int margin = 0; |
| |
| boolean useFirstLineMargin = lineStart == 0 || spanned.charAt(lineStart - 1) == '\n'; |
| for (int i = 0; i < spans.length; i++) { |
| if (spans[i] instanceof LeadingMarginSpan2) { |
| int spStart = spanned.getSpanStart(spans[i]); |
| int spanLine = getLineForOffset(spStart); |
| int count = ((LeadingMarginSpan2) spans[i]).getLeadingMarginLineCount(); |
| // if there is more than one LeadingMarginSpan2, use the count that is greatest |
| useFirstLineMargin |= line < spanLine + count; |
| } |
| } |
| for (int i = 0; i < spans.length; i++) { |
| LeadingMarginSpan span = spans[i]; |
| margin += span.getLeadingMargin(useFirstLineMargin); |
| } |
| |
| return margin; |
| } |
| |
| private static float measurePara(TextPaint paint, CharSequence text, int start, int end, |
| TextDirectionHeuristic textDir) { |
| MeasuredParagraph mt = null; |
| TextLine tl = TextLine.obtain(); |
| try { |
| mt = MeasuredParagraph.buildForBidi(text, start, end, textDir, mt); |
| final char[] chars = mt.getChars(); |
| final int len = chars.length; |
| final Directions directions = mt.getDirections(0, len); |
| final int dir = mt.getParagraphDir(); |
| boolean hasTabs = false; |
| TabStops tabStops = null; |
| // leading margins should be taken into account when measuring a paragraph |
| int margin = 0; |
| if (text instanceof Spanned) { |
| Spanned spanned = (Spanned) text; |
| LeadingMarginSpan[] spans = getParagraphSpans(spanned, start, end, |
| LeadingMarginSpan.class); |
| for (LeadingMarginSpan lms : spans) { |
| margin += lms.getLeadingMargin(true); |
| } |
| } |
| for (int i = 0; i < len; ++i) { |
| if (chars[i] == '\t') { |
| hasTabs = true; |
| if (text instanceof Spanned) { |
| Spanned spanned = (Spanned) text; |
| int spanEnd = spanned.nextSpanTransition(start, end, |
| TabStopSpan.class); |
| TabStopSpan[] spans = getParagraphSpans(spanned, start, spanEnd, |
| TabStopSpan.class); |
| if (spans.length > 0) { |
| tabStops = new TabStops(TAB_INCREMENT, spans); |
| } |
| } |
| break; |
| } |
| } |
| tl.set(paint, text, start, end, dir, directions, hasTabs, tabStops, |
| 0 /* ellipsisStart */, 0 /* ellipsisEnd */); |
| return margin + Math.abs(tl.metrics(null)); |
| } finally { |
| TextLine.recycle(tl); |
| if (mt != null) { |
| mt.recycle(); |
| } |
| } |
| } |
| |
| /** |
| * @hide |
| */ |
| @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE) |
| public static class TabStops { |
| private float[] mStops; |
| private int mNumStops; |
| private float mIncrement; |
| |
| public TabStops(float increment, Object[] spans) { |
| reset(increment, spans); |
| } |
| |
| void reset(float increment, Object[] spans) { |
| this.mIncrement = increment; |
| |
| int ns = 0; |
| if (spans != null) { |
| float[] stops = this.mStops; |
| for (Object o : spans) { |
| if (o instanceof TabStopSpan) { |
| if (stops == null) { |
| stops = new float[10]; |
| } else if (ns == stops.length) { |
| float[] nstops = new float[ns * 2]; |
| for (int i = 0; i < ns; ++i) { |
| nstops[i] = stops[i]; |
| } |
| stops = nstops; |
| } |
| stops[ns++] = ((TabStopSpan) o).getTabStop(); |
| } |
| } |
| if (ns > 1) { |
| Arrays.sort(stops, 0, ns); |
| } |
| if (stops != this.mStops) { |
| this.mStops = stops; |
| } |
| } |
| this.mNumStops = ns; |
| } |
| |
| float nextTab(float h) { |
| int ns = this.mNumStops; |
| if (ns > 0) { |
| float[] stops = this.mStops; |
| for (int i = 0; i < ns; ++i) { |
| float stop = stops[i]; |
| if (stop > h) { |
| return stop; |
| } |
| } |
| } |
| return nextDefaultStop(h, mIncrement); |
| } |
| |
| /** |
| * Returns the position of next tab stop. |
| */ |
| public static float nextDefaultStop(float h, float inc) { |
| return ((int) ((h + inc) / inc)) * inc; |
| } |
| } |
| |
| /** |
| * Returns the position of the next tab stop after h on the line. |
| * |
| * @param text the text |
| * @param start start of the line |
| * @param end limit of the line |
| * @param h the current horizontal offset |
| * @param tabs the tabs, can be null. If it is null, any tabs in effect |
| * on the line will be used. If there are no tabs, a default offset |
| * will be used to compute the tab stop. |
| * @return the offset of the next tab stop. |
| */ |
| /* package */ static float nextTab(CharSequence text, int start, int end, |
| float h, Object[] tabs) { |
| float nh = Float.MAX_VALUE; |
| boolean alltabs = false; |
| |
| if (text instanceof Spanned) { |
| if (tabs == null) { |
| tabs = getParagraphSpans((Spanned) text, start, end, TabStopSpan.class); |
| alltabs = true; |
| } |
| |
| for (int i = 0; i < tabs.length; i++) { |
| if (!alltabs) { |
| if (!(tabs[i] instanceof TabStopSpan)) |
| continue; |
| } |
| |
| int where = ((TabStopSpan) tabs[i]).getTabStop(); |
| |
| if (where < nh && where > h) |
| nh = where; |
| } |
| |
| if (nh != Float.MAX_VALUE) |
| return nh; |
| } |
| |
| return ((int) ((h + TAB_INCREMENT) / TAB_INCREMENT)) * TAB_INCREMENT; |
| } |
| |
| protected final boolean isSpanned() { |
| return mSpannedText; |
| } |
| |
| /** |
| * Returns the same as <code>text.getSpans()</code>, except where |
| * <code>start</code> and <code>end</code> are the same and are not |
| * at the very beginning of the text, in which case an empty array |
| * is returned instead. |
| * <p> |
| * This is needed because of the special case that <code>getSpans()</code> |
| * on an empty range returns the spans adjacent to that range, which is |
| * primarily for the sake of <code>TextWatchers</code> so they will get |
| * notifications when text goes from empty to non-empty. But it also |
| * has the unfortunate side effect that if the text ends with an empty |
| * paragraph, that paragraph accidentally picks up the styles of the |
| * preceding paragraph (even though those styles will not be picked up |
| * by new text that is inserted into the empty paragraph). |
| * <p> |
| * The reason it just checks whether <code>start</code> and <code>end</code> |
| * is the same is that the only time a line can contain 0 characters |
| * is if it is the final paragraph of the Layout; otherwise any line will |
| * contain at least one printing or newline character. The reason for the |
| * additional check if <code>start</code> is greater than 0 is that |
| * if the empty paragraph is the entire content of the buffer, paragraph |
| * styles that are already applied to the buffer will apply to text that |
| * is inserted into it. |
| */ |
| /* package */static <T> T[] getParagraphSpans(Spanned text, int start, int end, Class<T> type) { |
| if (start == end && start > 0) { |
| return ArrayUtils.emptyArray(type); |
| } |
| |
| if(text instanceof SpannableStringBuilder) { |
| return ((SpannableStringBuilder) text).getSpans(start, end, type, false); |
| } else { |
| return text.getSpans(start, end, type); |
| } |
| } |
| |
| private void ellipsize(int start, int end, int line, |
| char[] dest, int destoff, TextUtils.TruncateAt method) { |
| final int ellipsisCount = getEllipsisCount(line); |
| if (ellipsisCount == 0) { |
| return; |
| } |
| final int ellipsisStart = getEllipsisStart(line); |
| final int lineStart = getLineStart(line); |
| |
| final String ellipsisString = TextUtils.getEllipsisString(method); |
| final int ellipsisStringLen = ellipsisString.length(); |
| // Use the ellipsis string only if there are that at least as many characters to replace. |
| final boolean useEllipsisString = ellipsisCount >= ellipsisStringLen; |
| for (int i = 0; i < ellipsisCount; i++) { |
| final char c; |
| if (useEllipsisString && i < ellipsisStringLen) { |
| c = ellipsisString.charAt(i); |
| } else { |
| c = TextUtils.ELLIPSIS_FILLER; |
| } |
| |
| final int a = i + ellipsisStart + lineStart; |
| if (start <= a && a < end) { |
| dest[destoff + a - start] = c; |
| } |
| } |
| } |
| |
| /** |
| * Stores information about bidirectional (left-to-right or right-to-left) |
| * text within the layout of a line. |
| */ |
| public static class Directions { |
| /** |
| * Directions represents directional runs within a line of text. Runs are pairs of ints |
| * listed in visual order, starting from the leading margin. The first int of each pair is |
| * the offset from the first character of the line to the start of the run. The second int |
| * represents both the length and level of the run. The length is in the lower bits, |
| * accessed by masking with RUN_LENGTH_MASK. The level is in the higher bits, accessed by |
| * shifting by RUN_LEVEL_SHIFT and masking by RUN_LEVEL_MASK. To simply test for an RTL |
| * direction, test the bit using RUN_RTL_FLAG, if set then the direction is rtl. |
| * @hide |
| */ |
| @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE) |
| public int[] mDirections; |
| |
| /** |
| * @hide |
| */ |
| @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE) |
| public Directions(int[] dirs) { |
| mDirections = dirs; |
| } |
| |
| /** |
| * Returns number of BiDi runs. |
| * |
| * @hide |
| */ |
| public @IntRange(from = 0) int getRunCount() { |
| return mDirections.length / 2; |
| } |
| |
| /** |
| * Returns the start offset of the BiDi run. |
| * |
| * @param runIndex the index of the BiDi run |
| * @return the start offset of the BiDi run. |
| * @hide |
| */ |
| public @IntRange(from = 0) int getRunStart(@IntRange(from = 0) int runIndex) { |
| return mDirections[runIndex * 2]; |
| } |
| |
| /** |
| * Returns the length of the BiDi run. |
| * |
| * Note that this method may return too large number due to reducing the number of object |
| * allocations. The too large number means the remaining part is assigned to this run. The |
| * caller must clamp the returned value. |
| * |
| * @param runIndex the index of the BiDi run |
| * @return the length of the BiDi run. |
| * @hide |
| */ |
| public @IntRange(from = 0) int getRunLength(@IntRange(from = 0) int runIndex) { |
| return mDirections[runIndex * 2 + 1] & RUN_LENGTH_MASK; |
| } |
| |
| /** |
| * Returns true if the BiDi run is RTL. |
| * |
| * @param runIndex the index of the BiDi run |
| * @return true if the BiDi run is RTL. |
| * @hide |
| */ |
| public boolean isRunRtl(int runIndex) { |
| return (mDirections[runIndex * 2 + 1] & RUN_RTL_FLAG) != 0; |
| } |
| } |
| |
| /** |
| * Return the offset of the first character to be ellipsized away, |
| * relative to the start of the line. (So 0 if the beginning of the |
| * line is ellipsized, not getLineStart().) |
| */ |
| public abstract int getEllipsisStart(int line); |
| |
| /** |
| * Returns the number of characters to be ellipsized away, or 0 if |
| * no ellipsis is to take place. |
| */ |
| public abstract int getEllipsisCount(int line); |
| |
| /* package */ static class Ellipsizer implements CharSequence, GetChars { |
| /* package */ CharSequence mText; |
| /* package */ Layout mLayout; |
| /* package */ int mWidth; |
| /* package */ TextUtils.TruncateAt mMethod; |
| |
| public Ellipsizer(CharSequence s) { |
| mText = s; |
| } |
| |
| public char charAt(int off) { |
| char[] buf = TextUtils.obtain(1); |
| getChars(off, off + 1, buf, 0); |
| char ret = buf[0]; |
| |
| TextUtils.recycle(buf); |
| return ret; |
| } |
| |
| public void getChars(int start, int end, char[] dest, int destoff) { |
| int line1 = mLayout.getLineForOffset(start); |
| int line2 = mLayout.getLineForOffset(end); |
| |
| TextUtils.getChars(mText, start, end, dest, destoff); |
| |
| for (int i = line1; i <= line2; i++) { |
| mLayout.ellipsize(start, end, i, dest, destoff, mMethod); |
| } |
| } |
| |
| public int length() { |
| return mText.length(); |
| } |
| |
| public CharSequence subSequence(int start, int end) { |
| char[] s = new char[end - start]; |
| getChars(start, end, s, 0); |
| return new String(s); |
| } |
| |
| @Override |
| public String toString() { |
| char[] s = new char[length()]; |
| getChars(0, length(), s, 0); |
| return new String(s); |
| } |
| |
| } |
| |
| /* package */ static class SpannedEllipsizer extends Ellipsizer implements Spanned { |
| private Spanned mSpanned; |
| |
| public SpannedEllipsizer(CharSequence display) { |
| super(display); |
| mSpanned = (Spanned) display; |
| } |
| |
| public <T> T[] getSpans(int start, int end, Class<T> type) { |
| return mSpanned.getSpans(start, end, type); |
| } |
| |
| public int getSpanStart(Object tag) { |
| return mSpanned.getSpanStart(tag); |
| } |
| |
| public int getSpanEnd(Object tag) { |
| return mSpanned.getSpanEnd(tag); |
| } |
| |
| public int getSpanFlags(Object tag) { |
| return mSpanned.getSpanFlags(tag); |
| } |
| |
| @SuppressWarnings("rawtypes") |
| public int nextSpanTransition(int start, int limit, Class type) { |
| return mSpanned.nextSpanTransition(start, limit, type); |
| } |
| |
| @Override |
| public CharSequence subSequence(int start, int end) { |
| char[] s = new char[end - start]; |
| getChars(start, end, s, 0); |
| |
| SpannableString ss = new SpannableString(new String(s)); |
| TextUtils.copySpansFrom(mSpanned, start, end, Object.class, ss, 0); |
| return ss; |
| } |
| } |
| |
| private CharSequence mText; |
| @UnsupportedAppUsage |
| private TextPaint mPaint; |
| private TextPaint mWorkPaint = new TextPaint(); |
| private int mWidth; |
| private Alignment mAlignment = Alignment.ALIGN_NORMAL; |
| private float mSpacingMult; |
| private float mSpacingAdd; |
| private static final Rect sTempRect = new Rect(); |
| private boolean mSpannedText; |
| private TextDirectionHeuristic mTextDir; |
| private SpanSet<LineBackgroundSpan> mLineBackgroundSpans; |
| private int mJustificationMode; |
| |
| /** @hide */ |
| @IntDef(prefix = { "DIR_" }, value = { |
| DIR_LEFT_TO_RIGHT, |
| DIR_RIGHT_TO_LEFT |
| }) |
| @Retention(RetentionPolicy.SOURCE) |
| public @interface Direction {} |
| |
| public static final int DIR_LEFT_TO_RIGHT = 1; |
| public static final int DIR_RIGHT_TO_LEFT = -1; |
| |
| /* package */ static final int DIR_REQUEST_LTR = 1; |
| /* package */ static final int DIR_REQUEST_RTL = -1; |
| @UnsupportedAppUsage |
| /* package */ static final int DIR_REQUEST_DEFAULT_LTR = 2; |
| /* package */ static final int DIR_REQUEST_DEFAULT_RTL = -2; |
| |
| /* package */ static final int RUN_LENGTH_MASK = 0x03ffffff; |
| /* package */ static final int RUN_LEVEL_SHIFT = 26; |
| /* package */ static final int RUN_LEVEL_MASK = 0x3f; |
| /* package */ static final int RUN_RTL_FLAG = 1 << RUN_LEVEL_SHIFT; |
| |
| public enum Alignment { |
| ALIGN_NORMAL, |
| ALIGN_OPPOSITE, |
| ALIGN_CENTER, |
| /** @hide */ |
| @UnsupportedAppUsage |
| ALIGN_LEFT, |
| /** @hide */ |
| @UnsupportedAppUsage |
| ALIGN_RIGHT, |
| } |
| |
| private static final float TAB_INCREMENT = 20; |
| |
| /** @hide */ |
| @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE) |
| @UnsupportedAppUsage |
| public static final Directions DIRS_ALL_LEFT_TO_RIGHT = |
| new Directions(new int[] { 0, RUN_LENGTH_MASK }); |
| |
| /** @hide */ |
| @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE) |
| @UnsupportedAppUsage |
| public static final Directions DIRS_ALL_RIGHT_TO_LEFT = |
| new Directions(new int[] { 0, RUN_LENGTH_MASK | RUN_RTL_FLAG }); |
| |
| /** @hide */ |
| @Retention(RetentionPolicy.SOURCE) |
| @IntDef(prefix = { "TEXT_SELECTION_LAYOUT_" }, value = { |
| TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT, |
| TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT |
| }) |
| public @interface TextSelectionLayout {} |
| |
| /** @hide */ |
| public static final int TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT = 0; |
| /** @hide */ |
| public static final int TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT = 1; |
| |
| /** @hide */ |
| @FunctionalInterface |
| public interface SelectionRectangleConsumer { |
| /** |
| * Performs this operation on the given rectangle. |
| * |
| * @param left the left edge of the rectangle |
| * @param top the top edge of the rectangle |
| * @param right the right edge of the rectangle |
| * @param bottom the bottom edge of the rectangle |
| * @param textSelectionLayout the layout (RTL or LTR) of the text covered by this |
| * selection rectangle |
| */ |
| void accept(float left, float top, float right, float bottom, |
| @TextSelectionLayout int textSelectionLayout); |
| } |
| |
| } |