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/*
* 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 java.lang.ref.WeakReference;
import android.graphics.drawable.Drawable;
import android.graphics.Canvas;
import android.graphics.Paint;
/**
*
*/
public abstract class DynamicDrawableSpan
extends ReplacementSpan
{
/**
* 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();
public int getSize(Paint paint, CharSequence text,
int start, int end,
Paint.FontMetricsInt fm) {
Drawable b = getCachedDrawable();
if (fm != null) {
fm.ascent = -b.getIntrinsicHeight();
fm.descent = 0;
fm.top = fm.ascent;
fm.bottom = 0;
}
return b.getIntrinsicWidth();
}
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();
canvas.translate(x, bottom-b.getIntrinsicHeight());;
b.draw(canvas);
canvas.restore();
}
private Drawable getCachedDrawable() {
WeakReference wr = mDrawableRef;
Drawable b = null;
if (wr != null)
b = (Drawable) wr.get();
if (b == null) {
b = getDrawable();
mDrawableRef = new WeakReference(b);
}
return b;
}
private WeakReference mDrawableRef;
}
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