| /* |
| * 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.method; |
| |
| import android.text.Layout; |
| import android.text.NoCopySpan; |
| import android.text.Selection; |
| import android.text.Spannable; |
| import android.text.style.ClickableSpan; |
| import android.view.KeyEvent; |
| import android.view.MotionEvent; |
| import android.view.View; |
| import android.widget.TextView; |
| |
| /** |
| * A movement method that traverses links in the text buffer and scrolls if necessary. |
| * Supports clicking on links with DPad Center or Enter. |
| */ |
| public class LinkMovementMethod extends ScrollingMovementMethod { |
| private static final int CLICK = 1; |
| private static final int UP = 2; |
| private static final int DOWN = 3; |
| |
| @Override |
| public boolean canSelectArbitrarily() { |
| return true; |
| } |
| |
| @Override |
| protected boolean handleMovementKey(TextView widget, Spannable buffer, int keyCode, |
| int movementMetaState, KeyEvent event) { |
| switch (keyCode) { |
| case KeyEvent.KEYCODE_DPAD_CENTER: |
| case KeyEvent.KEYCODE_ENTER: |
| if (KeyEvent.metaStateHasNoModifiers(movementMetaState)) { |
| if (event.getAction() == KeyEvent.ACTION_DOWN && |
| event.getRepeatCount() == 0 && action(CLICK, widget, buffer)) { |
| return true; |
| } |
| } |
| break; |
| } |
| return super.handleMovementKey(widget, buffer, keyCode, movementMetaState, event); |
| } |
| |
| @Override |
| protected boolean up(TextView widget, Spannable buffer) { |
| if (action(UP, widget, buffer)) { |
| return true; |
| } |
| |
| return super.up(widget, buffer); |
| } |
| |
| @Override |
| protected boolean down(TextView widget, Spannable buffer) { |
| if (action(DOWN, widget, buffer)) { |
| return true; |
| } |
| |
| return super.down(widget, buffer); |
| } |
| |
| @Override |
| protected boolean left(TextView widget, Spannable buffer) { |
| if (action(UP, widget, buffer)) { |
| return true; |
| } |
| |
| return super.left(widget, buffer); |
| } |
| |
| @Override |
| protected boolean right(TextView widget, Spannable buffer) { |
| if (action(DOWN, widget, buffer)) { |
| return true; |
| } |
| |
| return super.right(widget, buffer); |
| } |
| |
| private boolean action(int what, TextView widget, Spannable buffer) { |
| Layout layout = widget.getLayout(); |
| |
| int padding = widget.getTotalPaddingTop() + |
| widget.getTotalPaddingBottom(); |
| int areatop = widget.getScrollY(); |
| int areabot = areatop + widget.getHeight() - padding; |
| |
| int linetop = layout.getLineForVertical(areatop); |
| int linebot = layout.getLineForVertical(areabot); |
| |
| int first = layout.getLineStart(linetop); |
| int last = layout.getLineEnd(linebot); |
| |
| ClickableSpan[] candidates = buffer.getSpans(first, last, ClickableSpan.class); |
| |
| int a = Selection.getSelectionStart(buffer); |
| int b = Selection.getSelectionEnd(buffer); |
| |
| int selStart = Math.min(a, b); |
| int selEnd = Math.max(a, b); |
| |
| if (selStart < 0) { |
| if (buffer.getSpanStart(FROM_BELOW) >= 0) { |
| selStart = selEnd = buffer.length(); |
| } |
| } |
| |
| if (selStart > last) |
| selStart = selEnd = Integer.MAX_VALUE; |
| if (selEnd < first) |
| selStart = selEnd = -1; |
| |
| switch (what) { |
| case CLICK: |
| if (selStart == selEnd) { |
| return false; |
| } |
| |
| ClickableSpan[] link = buffer.getSpans(selStart, selEnd, ClickableSpan.class); |
| |
| if (link.length != 1) |
| return false; |
| |
| link[0].onClick(widget); |
| break; |
| |
| case UP: |
| int beststart, bestend; |
| |
| beststart = -1; |
| bestend = -1; |
| |
| for (int i = 0; i < candidates.length; i++) { |
| int end = buffer.getSpanEnd(candidates[i]); |
| |
| if (end < selEnd || selStart == selEnd) { |
| if (end > bestend) { |
| beststart = buffer.getSpanStart(candidates[i]); |
| bestend = end; |
| } |
| } |
| } |
| |
| if (beststart >= 0) { |
| Selection.setSelection(buffer, bestend, beststart); |
| return true; |
| } |
| |
| break; |
| |
| case DOWN: |
| beststart = Integer.MAX_VALUE; |
| bestend = Integer.MAX_VALUE; |
| |
| for (int i = 0; i < candidates.length; i++) { |
| int start = buffer.getSpanStart(candidates[i]); |
| |
| if (start > selStart || selStart == selEnd) { |
| if (start < beststart) { |
| beststart = start; |
| bestend = buffer.getSpanEnd(candidates[i]); |
| } |
| } |
| } |
| |
| if (bestend < Integer.MAX_VALUE) { |
| Selection.setSelection(buffer, beststart, bestend); |
| return true; |
| } |
| |
| break; |
| } |
| |
| return false; |
| } |
| |
| @Override |
| public boolean onTouchEvent(TextView widget, Spannable buffer, |
| MotionEvent event) { |
| int action = event.getAction(); |
| |
| if (action == MotionEvent.ACTION_UP || |
| action == MotionEvent.ACTION_DOWN) { |
| int x = (int) event.getX(); |
| int y = (int) event.getY(); |
| |
| x -= widget.getTotalPaddingLeft(); |
| y -= widget.getTotalPaddingTop(); |
| |
| x += widget.getScrollX(); |
| y += widget.getScrollY(); |
| |
| Layout layout = widget.getLayout(); |
| int line = layout.getLineForVertical(y); |
| int off = layout.getOffsetForHorizontal(line, x); |
| |
| ClickableSpan[] link = buffer.getSpans(off, off, ClickableSpan.class); |
| |
| if (link.length != 0) { |
| if (action == MotionEvent.ACTION_UP) { |
| link[0].onClick(widget); |
| } else if (action == MotionEvent.ACTION_DOWN) { |
| Selection.setSelection(buffer, |
| buffer.getSpanStart(link[0]), |
| buffer.getSpanEnd(link[0])); |
| } |
| |
| return true; |
| } else { |
| Selection.removeSelection(buffer); |
| } |
| } |
| |
| return super.onTouchEvent(widget, buffer, event); |
| } |
| |
| @Override |
| public void initialize(TextView widget, Spannable text) { |
| Selection.removeSelection(text); |
| text.removeSpan(FROM_BELOW); |
| } |
| |
| @Override |
| public void onTakeFocus(TextView view, Spannable text, int dir) { |
| Selection.removeSelection(text); |
| |
| if ((dir & View.FOCUS_BACKWARD) != 0) { |
| text.setSpan(FROM_BELOW, 0, 0, Spannable.SPAN_POINT_POINT); |
| } else { |
| text.removeSpan(FROM_BELOW); |
| } |
| } |
| |
| public static MovementMethod getInstance() { |
| if (sInstance == null) |
| sInstance = new LinkMovementMethod(); |
| |
| return sInstance; |
| } |
| |
| private static LinkMovementMethod sInstance; |
| private static Object FROM_BELOW = new NoCopySpan.Concrete(); |
| } |