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.widget;
18
19import android.graphics.Bitmap;
20import android.graphics.Canvas;
21import android.graphics.Paint;
22import android.graphics.Point;
23import android.graphics.Rect;
24import android.graphics.drawable.Drawable;
25import android.os.Build;
26import android.view.View;
27import android.widget.RemoteViews;
28
29import com.android.launcher3.DeviceProfile;
30import com.android.launcher3.DragSource;
31import com.android.launcher3.Launcher;
32import com.android.launcher3.LauncherAppState;
33import com.android.launcher3.PendingAddItemInfo;
34import com.android.launcher3.R;
35import com.android.launcher3.Workspace;
36import com.android.launcher3.dragndrop.DragOptions;
37import com.android.launcher3.dragndrop.LivePreviewWidgetCell;
38import com.android.launcher3.graphics.DragPreviewProvider;
39import com.android.launcher3.graphics.HolographicOutlineHelper;
40import com.android.launcher3.graphics.LauncherIcons;
41
42/**
43 * Extension of {@link DragPreviewProvider} with logic specific to pending widgets/shortcuts
44 * dragged from the widget tray.
45 */
46public class PendingItemDragHelper extends DragPreviewProvider {
47
48    private static final float MAX_WIDGET_SCALE = 1.25f;
49
50    private final PendingAddItemInfo mAddInfo;
51
52    private Bitmap mPreviewBitmap;
53    private RemoteViews mPreview;
54
55    public PendingItemDragHelper(View view) {
56        super(view);
57        mAddInfo = (PendingAddItemInfo) view.getTag();
58    }
59
60    public void setPreview(RemoteViews preview) {
61        mPreview = preview;
62    }
63
64    /**
65     * Starts the drag for the pending item associated with the view.
66     *
67     * @param previewBounds The bounds where the image was displayed,
68     *                      {@link WidgetImageView#getBitmapBounds()}
69     * @param previewBitmapWidth The actual width of the bitmap displayed in the view.
70     * @param previewViewWidth The width of {@link WidgetImageView} displaying the preview
71     * @param screenPos Position of {@link WidgetImageView} on the screen
72     */
73    public void startDrag(Rect previewBounds, int previewBitmapWidth, int previewViewWidth,
74            Point screenPos, DragSource source, DragOptions options) {
75        final Launcher launcher = Launcher.getLauncher(mView.getContext());
76        LauncherAppState app = LauncherAppState.getInstance(launcher);
77
78        Bitmap preview = null;
79        final float scale;
80        final Point dragOffset;
81        final Rect dragRegion;
82
83
84        if (mAddInfo instanceof PendingAddWidgetInfo) {
85            PendingAddWidgetInfo createWidgetInfo = (PendingAddWidgetInfo) mAddInfo;
86            int[] size = launcher.getWorkspace().estimateItemSize(createWidgetInfo, true, false);
87
88            int maxWidth = Math.min((int) (previewBitmapWidth * MAX_WIDGET_SCALE), size[0]);
89
90            int[] previewSizeBeforeScale = new int[1];
91
92            if (mPreview != null) {
93                preview = LivePreviewWidgetCell.generateFromRemoteViews(launcher, mPreview,
94                        createWidgetInfo.info, maxWidth, previewSizeBeforeScale);
95            }
96            if (preview == null) {
97                preview = app.getWidgetCache().generateWidgetPreview(
98                        launcher, createWidgetInfo.info, maxWidth, null, previewSizeBeforeScale);
99            }
100
101            if (previewSizeBeforeScale[0] < previewBitmapWidth) {
102                // The icon has extra padding around it.
103                int padding = (previewBitmapWidth - previewSizeBeforeScale[0]) / 2;
104                if (previewBitmapWidth > previewViewWidth) {
105                    padding = padding * previewViewWidth / previewBitmapWidth;
106                }
107
108                previewBounds.left += padding;
109                previewBounds.right -= padding;
110            }
111            scale = previewBounds.width() / (float) preview.getWidth();
112            launcher.getDragController().addDragListener(new WidgetHostViewLoader(launcher, mView));
113
114            dragOffset = null;
115            dragRegion = null;
116        } else {
117            PendingAddShortcutInfo createShortcutInfo = (PendingAddShortcutInfo) mAddInfo;
118            Drawable icon = createShortcutInfo.activityInfo.getFullResIcon(app.getIconCache());
119            preview = LauncherIcons.createScaledBitmapWithoutShadow(icon, launcher, 0);
120            mAddInfo.spanX = mAddInfo.spanY = 1;
121            scale = ((float) launcher.getDeviceProfile().iconSizePx) / preview.getWidth();
122
123            dragOffset = new Point(previewPadding / 2, previewPadding / 2);
124
125            // Create a preview same as the workspace cell size and draw the icon at the
126            // appropriate position.
127            int[] size = launcher.getWorkspace().estimateItemSize(mAddInfo, false, true);
128            DeviceProfile dp = launcher.getDeviceProfile();
129            int iconSize = dp.iconSizePx;
130
131            int padding = launcher.getResources()
132                    .getDimensionPixelSize(R.dimen.widget_preview_shortcut_padding);
133            previewBounds.left += padding;
134            previewBounds.top += padding;
135
136            dragRegion = new Rect();
137            dragRegion.left = (size[0] - iconSize) / 2;
138            dragRegion.right = dragRegion.left + iconSize;
139            dragRegion.top = (size[1] - iconSize - dp.iconTextSizePx - dp.iconDrawablePaddingPx) / 2;
140            dragRegion.bottom = dragRegion.top + iconSize;
141        }
142
143        // Since we are not going through the workspace for starting the drag, set drag related
144        // information on the workspace before starting the drag.
145        launcher.getWorkspace().prepareDragWithProvider(this);
146
147        int dragLayerX = screenPos.x + previewBounds.left
148                + (int) ((scale * preview.getWidth() - preview.getWidth()) / 2);
149        int dragLayerY = screenPos.y + previewBounds.top
150                + (int) ((scale * preview.getHeight() - preview.getHeight()) / 2);
151
152        mPreviewBitmap = preview;
153        // Start the drag
154        launcher.getDragController().startDrag(preview, dragLayerX, dragLayerY, source, mAddInfo,
155                dragOffset, dragRegion, scale, options);
156    }
157
158
159    @Override
160    public Bitmap createDragOutline(Canvas canvas) {
161        if (mAddInfo instanceof PendingAddShortcutInfo) {
162            int width = mPreviewBitmap.getWidth();
163            int height = mPreviewBitmap.getHeight();
164            Bitmap b = Bitmap.createBitmap(width + blurSizeOutline, height + blurSizeOutline,
165                    Bitmap.Config.ALPHA_8);
166            canvas.setBitmap(b);
167
168            Launcher launcher = Launcher.getLauncher(mView.getContext());
169            int size = launcher.getDeviceProfile().iconSizePx;
170
171            Rect src = new Rect(0, 0, mPreviewBitmap.getWidth(), mPreviewBitmap.getHeight());
172            Rect dst = new Rect(0, 0, size, size);
173            dst.offset(blurSizeOutline / 2, blurSizeOutline / 2);
174            canvas.drawBitmap(mPreviewBitmap, src, dst, new Paint(Paint.FILTER_BITMAP_FLAG));
175
176            HolographicOutlineHelper.getInstance(mView.getContext())
177                    .applyExpensiveOutlineWithBlur(b, canvas);
178
179            canvas.setBitmap(null);
180            return b;
181        }
182
183        Workspace workspace = Launcher.getLauncher(mView.getContext()).getWorkspace();
184        int[] size = workspace.estimateItemSize(mAddInfo, false, false);
185
186        int w = size[0];
187        int h = size[1];
188        final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ALPHA_8);
189        canvas.setBitmap(b);
190
191        Rect src = new Rect(0, 0, mPreviewBitmap.getWidth(), mPreviewBitmap.getHeight());
192        float scaleFactor = Math.min((w - blurSizeOutline) / (float) mPreviewBitmap.getWidth(),
193                (h - blurSizeOutline) / (float) mPreviewBitmap.getHeight());
194        int scaledWidth = (int) (scaleFactor * mPreviewBitmap.getWidth());
195        int scaledHeight = (int) (scaleFactor * mPreviewBitmap.getHeight());
196        Rect dst = new Rect(0, 0, scaledWidth, scaledHeight);
197
198        // center the image
199        dst.offset((w - scaledWidth) / 2, (h - scaledHeight) / 2);
200
201        canvas.drawBitmap(mPreviewBitmap, src, dst, null);
202        HolographicOutlineHelper.getInstance(mView.getContext())
203                .applyExpensiveOutlineWithBlur(b, canvas);
204        canvas.setBitmap(null);
205
206        return b;
207    }
208}
209