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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.res.ColorStateList;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.Shape;
public class ResizablePathDrawable extends ShapeDrawable {
// An attribute mirroring the super class' value. getAlpha() is only
// available in API 19+ so to use that alpha value, we have to mirror it.
private int alpha = 255;
private final ColorStateList colorStateList;
private int currentColor;
public ResizablePathDrawable(NonScaledPathShape shape, int color) {
this(shape, ColorStateList.valueOf(color));
}
public ResizablePathDrawable(NonScaledPathShape shape, ColorStateList colorStateList) {
super(shape);
this.colorStateList = colorStateList;
updateColor(getState());
}
private boolean updateColor(int[] stateSet) {
int newColor = colorStateList.getColorForState(stateSet, Color.WHITE);
if (newColor != currentColor) {
currentColor = newColor;
alpha = Color.alpha(currentColor);
invalidateSelf();
return true;
}
return false;
}
public Path getPath() {
final NonScaledPathShape shape = (NonScaledPathShape) getShape();
return shape.path;
}
@Override
public boolean isStateful() {
return true;
}
@Override
protected void onDraw(Shape shape, Canvas canvas, Paint paint) {
paint.setColor(currentColor);
// setAlpha overrides the alpha value in set color. Since we just set the color,
// the alpha value is reset: override the alpha value with the old value. We don't
// set alpha if the color is transparent.
//
// Note: We *should* be able to call Shape.setAlpha, rather than Paint.setAlpha, but
// then the opacity doesn't change - dunno why but probably not worth the time.
if (currentColor != Color.TRANSPARENT) {
paint.setAlpha(alpha);
}
super.onDraw(shape, canvas, paint);
}
@Override
public void setAlpha(final int alpha) {
super.setAlpha(alpha);
this.alpha = alpha;
}
@Override
protected boolean onStateChange(int[] stateSet) {
return updateColor(stateSet);
}
/**
* Path-based shape implementation that re-creates the path
* when it gets resized as opposed to PathShape's scaling
* behaviour.
*/
public static class NonScaledPathShape extends Shape {
private Path path;
public NonScaledPathShape() {
path = new Path();
}
@Override
public void draw(Canvas canvas, Paint paint) {
// No point in drawing the shape if it's not
// going to be visible.
if (paint.getColor() == Color.TRANSPARENT) {
return;
}
canvas.drawPath(path, paint);
}
protected Path getPath() {
return path;
}
@Override
public NonScaledPathShape clone() throws CloneNotSupportedException {
final NonScaledPathShape clonedShape = (NonScaledPathShape) super.clone();
clonedShape.path = new Path(path);
return clonedShape;
}
}
}
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