1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher2; 18 19 import android.content.Context; 20 import android.content.res.Resources; 21 import android.graphics.Bitmap; 22 import android.graphics.Canvas; 23 import android.graphics.drawable.StateListDrawable; 24 import android.view.View; 25 26 public class HolographicViewHelper { 27 28 private final HolographicOutlineHelper mOutlineHelper = new HolographicOutlineHelper(); 29 private final Canvas mTempCanvas = new Canvas(); 30 31 private boolean mStatesUpdated; 32 private int mHighlightColor; 33 34 public HolographicViewHelper(Context context) { 35 Resources res = context.getResources(); 36 mHighlightColor = res.getColor(android.R.color.holo_blue_light); 37 } 38 39 /** 40 * Generate the pressed/focused states if necessary. 41 */ 42 void generatePressedFocusedStates(View v) { 43 if (!mStatesUpdated) { 44 mStatesUpdated = true; 45 Bitmap outline = createGlowingOutline(v, mTempCanvas, mHighlightColor, mHighlightColor); 46 FastBitmapDrawable d = new FastBitmapDrawable(outline); 47 48 StateListDrawable states = new StateListDrawable(); 49 states.addState(new int[] {android.R.attr.state_pressed}, d); 50 states.addState(new int[] {android.R.attr.state_focused}, d); 51 v.setBackgroundDrawable(states); 52 } 53 } 54 55 /** 56 * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location. 57 * Responsibility for the bitmap is transferred to the caller. 58 */ 59 private Bitmap createGlowingOutline(View v, Canvas canvas, int outlineColor, int glowColor) { 60 final int padding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS; 61 final Bitmap b = Bitmap.createBitmap( 62 v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888); 63 64 canvas.setBitmap(b); 65 canvas.save(); 66 v.draw(canvas); 67 canvas.restore(); 68 mOutlineHelper.applyOuterBlur(b, canvas, outlineColor); 69 canvas.setBitmap(null); 70 71 return b; 72 } 73 } 74
