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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.drawable.StateListDrawable;
import android.view.View;
public class HolographicViewHelper {
private final HolographicOutlineHelper mOutlineHelper = new HolographicOutlineHelper();
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(View v) {
if (!mStatesUpdated) {
mStatesUpdated = true;
Bitmap outline = createGlowingOutline(v, mTempCanvas, mHighlightColor, mHighlightColor);
FastBitmapDrawable d = new FastBitmapDrawable(outline);
StateListDrawable states = new StateListDrawable();
states.addState(new int[] {android.R.attr.state_pressed}, d);
states.addState(new int[] {android.R.attr.state_focused}, d);
v.setBackgroundDrawable(states);
}
}
/**
* Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
* Responsibility for the bitmap is transferred to the caller.
*/
private Bitmap createGlowingOutline(View v, Canvas canvas, int outlineColor, int glowColor) {
final int padding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS;
final Bitmap b = Bitmap.createBitmap(
v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
canvas.setBitmap(b);
canvas.save();
v.draw(canvas);
canvas.restore();
mOutlineHelper.applyOuterBlur(b, canvas, outlineColor);
canvas.setBitmap(null);
return b;
}
}
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