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
17package com.android.launcher3.shortcuts;
18
19import android.graphics.Bitmap;
20import android.graphics.Canvas;
21import android.graphics.Point;
22import android.graphics.Rect;
23import android.graphics.drawable.Drawable;
24import android.view.View;
25
26import com.android.launcher3.HolographicOutlineHelper;
27import com.android.launcher3.Launcher;
28import com.android.launcher3.Utilities;
29import com.android.launcher3.graphics.DragPreviewProvider;
30
31/**
32 * Extension of {@link DragPreviewProvider} which generates bitmaps scaled to the default icon size.
33 */
34public class ShortcutDragPreviewProvider extends DragPreviewProvider {
35
36    private final Point mPositionShift;
37
38    public ShortcutDragPreviewProvider(View icon, Point shift) {
39        super(icon);
40        mPositionShift = shift;
41    }
42
43    @Override
44    public Bitmap createDragOutline(Canvas canvas) {
45        Bitmap b = drawScaledPreview(canvas, Bitmap.Config.ALPHA_8);
46
47        HolographicOutlineHelper.obtain(mView.getContext())
48                .applyExpensiveOutlineWithBlur(b, canvas);
49        canvas.setBitmap(null);
50        return b;
51    }
52
53    @Override
54    public Bitmap createDragBitmap(Canvas canvas) {
55        Bitmap b = drawScaledPreview(canvas, Bitmap.Config.ARGB_8888);
56        canvas.setBitmap(null);
57        return b;
58    }
59
60    private Bitmap drawScaledPreview(Canvas canvas, Bitmap.Config config) {
61        Drawable d = mView.getBackground();
62        Rect bounds = getDrawableBounds(d);
63
64        int size = Launcher.getLauncher(mView.getContext()).getDeviceProfile().iconSizePx;
65
66        final Bitmap b = Bitmap.createBitmap(
67                size + DRAG_BITMAP_PADDING,
68                size + DRAG_BITMAP_PADDING,
69                config);
70
71        canvas.setBitmap(b);
72        canvas.save(Canvas.MATRIX_SAVE_FLAG);
73        canvas.translate(DRAG_BITMAP_PADDING / 2, DRAG_BITMAP_PADDING / 2);
74        canvas.scale(((float) size) / bounds.width(), ((float) size) / bounds.height(), 0, 0);
75        canvas.translate(bounds.left, bounds.top);
76        d.draw(canvas);
77        canvas.restore();
78        return b;
79    }
80
81    @Override
82    public float getScaleAndPosition(Bitmap preview, int[] outPos) {
83        Launcher launcher = Launcher.getLauncher(mView.getContext());
84        int iconSize = getDrawableBounds(mView.getBackground()).width();
85        float scale = launcher.getDragLayer().getLocationInDragLayer(mView, outPos);
86
87        int iconLeft = mView.getPaddingStart();
88        if (Utilities.isRtl(mView.getResources())) {
89            iconLeft = mView.getWidth() - iconSize - iconLeft;
90        }
91
92        outPos[0] += Math.round(scale * iconLeft + (scale * iconSize - preview.getWidth()) / 2 +
93                mPositionShift.x);
94        outPos[1] += Math.round((scale * mView.getHeight() - preview.getHeight()) / 2
95                + mPositionShift.y);
96        float size = launcher.getDeviceProfile().iconSizePx;
97        return scale * iconSize / size;
98    }
99}
100