| /* |
| * 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.style; |
| |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.Paint; |
| import android.graphics.Rect; |
| import android.graphics.Paint.Style; |
| import android.graphics.drawable.Drawable; |
| import android.util.Log; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * |
| */ |
| public abstract class DynamicDrawableSpan extends ReplacementSpan { |
| private static final String TAG = "DynamicDrawableSpan"; |
| |
| /** |
| * A constant indicating that the bottom of this span should be aligned |
| * with the bottom of the surrounding text, i.e., at the same level as the |
| * lowest descender in the text. |
| */ |
| public static final int ALIGN_BOTTOM = 0; |
| |
| /** |
| * A constant indicating that the bottom of this span should be aligned |
| * with the baseline of the surrounding text. |
| */ |
| public static final int ALIGN_BASELINE = 1; |
| |
| protected final int mVerticalAlignment; |
| |
| public DynamicDrawableSpan() { |
| mVerticalAlignment = ALIGN_BOTTOM; |
| } |
| |
| /** |
| * @param verticalAlignment one of {@link #ALIGN_BOTTOM} or {@link #ALIGN_BASELINE}. |
| */ |
| protected DynamicDrawableSpan(int verticalAlignment) { |
| mVerticalAlignment = verticalAlignment; |
| } |
| |
| /** |
| * Returns the vertical alignment of this span, one of {@link #ALIGN_BOTTOM} or |
| * {@link #ALIGN_BASELINE}. |
| */ |
| public int getVerticalAlignment() { |
| return mVerticalAlignment; |
| } |
| |
| /** |
| * Your subclass must implement this method to provide the bitmap |
| * to be drawn. The dimensions of the bitmap must be the same |
| * from each call to the next. |
| */ |
| public abstract Drawable getDrawable(); |
| |
| @Override |
| public int getSize(Paint paint, CharSequence text, |
| int start, int end, |
| Paint.FontMetricsInt fm) { |
| Drawable d = getCachedDrawable(); |
| Rect rect = d.getBounds(); |
| |
| if (fm != null) { |
| fm.ascent = -rect.bottom; |
| fm.descent = 0; |
| |
| fm.top = fm.ascent; |
| fm.bottom = 0; |
| } |
| |
| return rect.right; |
| } |
| |
| @Override |
| public void draw(Canvas canvas, CharSequence text, |
| int start, int end, float x, |
| int top, int y, int bottom, Paint paint) { |
| Drawable b = getCachedDrawable(); |
| canvas.save(); |
| |
| int transY = bottom - b.getBounds().bottom; |
| if (mVerticalAlignment == ALIGN_BASELINE) { |
| transY -= paint.getFontMetricsInt().descent; |
| } |
| |
| canvas.translate(x, transY); |
| b.draw(canvas); |
| canvas.restore(); |
| } |
| |
| private Drawable getCachedDrawable() { |
| WeakReference<Drawable> wr = mDrawableRef; |
| Drawable d = null; |
| |
| if (wr != null) |
| d = wr.get(); |
| |
| if (d == null) { |
| d = getDrawable(); |
| mDrawableRef = new WeakReference<Drawable>(d); |
| } |
| |
| return d; |
| } |
| |
| private WeakReference<Drawable> mDrawableRef; |
| } |
| |