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/*
* Copyright (C) 2011 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.launcher2;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.StateListDrawable;
import android.widget.ImageView;
public class HolographicViewHelper {
private final Canvas mTempCanvas = new Canvas();
private boolean mStatesUpdated;
private int mHighlightColor;
public HolographicViewHelper(Context context) {
Resources res = context.getResources();
mHighlightColor = res.getColor(android.R.color.holo_blue_light);
}
/**
* Generate the pressed/focused states if necessary.
*/
void generatePressedFocusedStates(ImageView v) {
if (!mStatesUpdated && v != null) {
mStatesUpdated = true;
Bitmap original = createOriginalImage(v, mTempCanvas);
Bitmap outline = createPressImage(v, mTempCanvas);
FastBitmapDrawable originalD = new FastBitmapDrawable(original);
FastBitmapDrawable outlineD = new FastBitmapDrawable(outline);
StateListDrawable states = new StateListDrawable();
states.addState(new int[] {android.R.attr.state_pressed}, outlineD);
states.addState(new int[] {android.R.attr.state_focused}, outlineD);
states.addState(new int[] {}, originalD);
v.setImageDrawable(states);
}
}
/**
* Invalidates the pressed/focused states.
*/
void invalidatePressedFocusedStates(ImageView v) {
mStatesUpdated = false;
if (v != null) {
v.invalidate();
}
}
/**
* Creates a copy of the original image.
*/
private Bitmap createOriginalImage(ImageView v, Canvas canvas) {
final Drawable d = v.getDrawable();
final Bitmap b = Bitmap.createBitmap(
d.getIntrinsicWidth(), d.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
canvas.setBitmap(b);
canvas.save();
d.draw(canvas);
canvas.restore();
canvas.setBitmap(null);
return b;
}
/**
* Creates a new press state image which is the old image with a blue overlay.
* Responsibility for the bitmap is transferred to the caller.
*/
private Bitmap createPressImage(ImageView v, Canvas canvas) {
final Drawable d = v.getDrawable();
final Bitmap b = Bitmap.createBitmap(
d.getIntrinsicWidth(), d.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
canvas.setBitmap(b);
canvas.save();
d.draw(canvas);
canvas.restore();
canvas.drawColor(mHighlightColor, PorterDuff.Mode.SRC_IN);
canvas.setBitmap(null);
return b;
}
}