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/*
* Copyright (C) 2008 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 com.android.launcher;
import android.widget.TextView;
import android.content.Context;
import android.util.AttributeSet;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.text.Layout;
/**
* TextView that draws a bubble behind the text. We cannot use a LineBackgroundSpan
* because we want to make the bubble taller than the text and TextView's clip is
* too aggressive.
*/
public class BubbleTextView extends TextView {
private static final float CORNER_RADIUS = 8.0f;
private static final float PADDING_H = 5.0f;
private static final float PADDING_V = 1.0f;
private final RectF mRect = new RectF();
private Paint mPaint;
private boolean mBackgroundSizeChanged;
private Drawable mBackground;
private float mCornerRadius;
private float mPaddingH;
private float mPaddingV;
public BubbleTextView(Context context) {
super(context);
init();
}
public BubbleTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public BubbleTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
setFocusable(true);
mBackground = getBackground();
setBackgroundDrawable(null);
mBackground.setCallback(this);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setColor(getContext().getResources().getColor(R.color.bubble_dark_background));
final float scale = getContext().getResources().getDisplayMetrics().density;
mCornerRadius = CORNER_RADIUS * scale;
mPaddingH = PADDING_H * scale;
//noinspection PointlessArithmeticExpression
mPaddingV = PADDING_V * scale;
}
@Override
protected boolean setFrame(int left, int top, int right, int bottom) {
if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) {
mBackgroundSizeChanged = true;
}
return super.setFrame(left, top, right, bottom);
}
@Override
protected boolean verifyDrawable(Drawable who) {
return who == mBackground || super.verifyDrawable(who);
}
@Override
protected void drawableStateChanged() {
Drawable d = mBackground;
if (d != null && d.isStateful()) {
d.setState(getDrawableState());
}
super.drawableStateChanged();
}
@Override
public void draw(Canvas canvas) {
final Drawable background = mBackground;
if (background != null) {
final int scrollX = mScrollX;
final int scrollY = mScrollY;
if (mBackgroundSizeChanged) {
background.setBounds(0, 0, mRight - mLeft, mBottom - mTop);
mBackgroundSizeChanged = false;
}
if ((scrollX | scrollY) == 0) {
background.draw(canvas);
} else {
canvas.translate(scrollX, scrollY);
background.draw(canvas);
canvas.translate(-scrollX, -scrollY);
}
}
final Layout layout = getLayout();
final RectF rect = mRect;
final int left = getCompoundPaddingLeft();
final int top = getExtendedPaddingTop();
rect.set(left + layout.getLineLeft(0) - mPaddingH,
top + layout.getLineTop(0) - mPaddingV,
Math.min(left + layout.getLineRight(0) + mPaddingH, mScrollX + mRight - mLeft),
top + layout.getLineBottom(0) + mPaddingV);
canvas.drawRoundRect(rect, mCornerRadius, mCornerRadius, mPaint);
super.draw(canvas);
}
}
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