Winson Chung
74 lines
2.6 KiB
Java
74 lines
2.6 KiB
Java
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher2;
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import android.content.Context;
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import android.content.res.Resources;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.drawable.StateListDrawable;
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import android.view.View;
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public class HolographicViewHelper {
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private final HolographicOutlineHelper mOutlineHelper = new HolographicOutlineHelper();
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private final Canvas mTempCanvas = new Canvas();
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private boolean mStatesUpdated;
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private int mHighlightColor;
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public HolographicViewHelper(Context context) {
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Resources res = context.getResources();
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mHighlightColor = res.getColor(android.R.color.holo_blue_light);
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}
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/**
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* Generate the pressed/focused states if necessary.
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*/
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void generatePressedFocusedStates(View v) {
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if (!mStatesUpdated) {
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mStatesUpdated = true;
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Bitmap outline = createGlowingOutline(v, mTempCanvas, mHighlightColor, mHighlightColor);
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FastBitmapDrawable d = new FastBitmapDrawable(outline);
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StateListDrawable states = new StateListDrawable();
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states.addState(new int[] {android.R.attr.state_pressed}, d);
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states.addState(new int[] {android.R.attr.state_focused}, d);
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v.setBackgroundDrawable(states);
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}
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}
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/**
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* Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
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* Responsibility for the bitmap is transferred to the caller.
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*/
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private Bitmap createGlowingOutline(View v, Canvas canvas, int outlineColor, int glowColor) {
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final int padding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS;
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final Bitmap b = Bitmap.createBitmap(
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v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
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canvas.setBitmap(b);
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canvas.save();
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v.draw(canvas);
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canvas.restore();
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mOutlineHelper.applyOuterBlur(b, canvas, outlineColor);
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canvas.setBitmap(null);
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return b;
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}
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}
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