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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.widget;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Shader;
import android.util.AttributeSet;
/**
* Fades the end of the text by gecko:fadeWidth amount,
* if the text is too long and requires an ellipsis.
*
* This implementation is an improvement over Android's built-in fadingEdge
* and the fastest of Fennec's implementations. However, it only works for
* text of one color. It works by applying a linear gradient directly to the text.
*/
public class FadedSingleColorTextView extends FadedTextView {
// Shader for the fading edge.
private FadedTextGradient mTextGradient;
public FadedSingleColorTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
private void updateGradientShader() {
final int color = getCurrentTextColor();
final int width = getAvailableWidth();
final boolean needsNewGradient = (mTextGradient == null ||
mTextGradient.getColor() != color ||
mTextGradient.getWidth() != width);
final boolean needsEllipsis = needsEllipsis();
if (needsEllipsis && needsNewGradient) {
mTextGradient = new FadedTextGradient(width, fadeWidth, color);
}
getPaint().setShader(needsEllipsis ? mTextGradient : null);
}
@Override
public void onDraw(Canvas canvas) {
updateGradientShader();
super.onDraw(canvas);
}
private static class FadedTextGradient extends LinearGradient {
private final int mWidth;
private final int mColor;
public FadedTextGradient(int width, int fadeWidth, int color) {
super(0, 0, width, 0,
new int[] { color, color, 0x0 },
new float[] { 0, ((float) (width - fadeWidth) / width), 1.0f },
Shader.TileMode.CLAMP);
mWidth = width;
mColor = color;
}
public int getWidth() {
return mWidth;
}
public int getColor() {
return mColor;
}
}
}
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