1 /* 2 * Copyright (C) 2016 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.launcher3.widget; 18 19 import android.graphics.Bitmap; 20 import android.graphics.Canvas; 21 import android.graphics.Rect; 22 import android.view.View; 23 24 import com.android.launcher3.HolographicOutlineHelper; 25 import com.android.launcher3.Launcher; 26 import com.android.launcher3.PendingAddItemInfo; 27 import com.android.launcher3.Workspace; 28 import com.android.launcher3.graphics.DragPreviewProvider; 29 30 /** 31 * Extension of {@link DragPreviewProvider} with logic specific to pending widgets/shortcuts 32 * dragged from the widget tray. 33 */ 34 public class PendingItemPreviewProvider extends DragPreviewProvider { 35 36 private final PendingAddItemInfo mAddInfo; 37 private final Bitmap mPreviewBitmap; 38 PendingItemPreviewProvider(View view, PendingAddItemInfo addInfo, Bitmap preview)39 public PendingItemPreviewProvider(View view, PendingAddItemInfo addInfo, Bitmap preview) { 40 super(view); 41 mAddInfo = addInfo; 42 mPreviewBitmap = preview; 43 } 44 45 @Override createDragOutline(Canvas canvas)46 public Bitmap createDragOutline(Canvas canvas) { 47 Workspace workspace = Launcher.getLauncher(mView.getContext()).getWorkspace(); 48 int[] size = workspace.estimateItemSize(mAddInfo, false); 49 50 int w = size[0]; 51 int h = size[1]; 52 final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ALPHA_8); 53 canvas.setBitmap(b); 54 55 Rect src = new Rect(0, 0, mPreviewBitmap.getWidth(), mPreviewBitmap.getHeight()); 56 float scaleFactor = Math.min((w - DRAG_BITMAP_PADDING) / (float) mPreviewBitmap.getWidth(), 57 (h - DRAG_BITMAP_PADDING) / (float) mPreviewBitmap.getHeight()); 58 int scaledWidth = (int) (scaleFactor * mPreviewBitmap.getWidth()); 59 int scaledHeight = (int) (scaleFactor * mPreviewBitmap.getHeight()); 60 Rect dst = new Rect(0, 0, scaledWidth, scaledHeight); 61 62 // center the image 63 dst.offset((w - scaledWidth) / 2, (h - scaledHeight) / 2); 64 65 canvas.drawBitmap(mPreviewBitmap, src, dst, null); 66 67 // Don't clip alpha values for the drag outline if we're using the default widget preview 68 boolean clipAlpha = !(mAddInfo instanceof PendingAddWidgetInfo && 69 (((PendingAddWidgetInfo) mAddInfo).previewImage == 0)); 70 HolographicOutlineHelper.obtain(mView.getContext()) 71 .applyExpensiveOutlineWithBlur(b, canvas, clipAlpha); 72 canvas.setBitmap(null); 73 74 return b; 75 } 76 } 77