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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher3.widget;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.widget.RemoteViews;
import com.android.launcher3.DeviceProfile;
import com.android.launcher3.DragSource;
import com.android.launcher3.Launcher;
import com.android.launcher3.LauncherAppState;
import com.android.launcher3.PendingAddItemInfo;
import com.android.launcher3.R;
import com.android.launcher3.Workspace;
import com.android.launcher3.dragndrop.DragOptions;
import com.android.launcher3.dragndrop.LivePreviewWidgetCell;
import com.android.launcher3.graphics.DragPreviewProvider;
import com.android.launcher3.graphics.HolographicOutlineHelper;
import com.android.launcher3.graphics.LauncherIcons;
/**
* Extension of {@link DragPreviewProvider} with logic specific to pending widgets/shortcuts
* dragged from the widget tray.
*/
public class PendingItemDragHelper extends DragPreviewProvider {
private static final float MAX_WIDGET_SCALE = 1.25f;
private final PendingAddItemInfo mAddInfo;
private Bitmap mPreviewBitmap;
private RemoteViews mPreview;
public PendingItemDragHelper(View view) {
super(view);
mAddInfo = (PendingAddItemInfo) view.getTag();
}
public void setPreview(RemoteViews preview) {
mPreview = preview;
}
/**
* Starts the drag for the pending item associated with the view.
*
* @param previewBounds The bounds where the image was displayed,
* {@link WidgetImageView#getBitmapBounds()}
* @param previewBitmapWidth The actual width of the bitmap displayed in the view.
* @param previewViewWidth The width of {@link WidgetImageView} displaying the preview
* @param screenPos Position of {@link WidgetImageView} on the screen
*/
public void startDrag(Rect previewBounds, int previewBitmapWidth, int previewViewWidth,
Point screenPos, DragSource source, DragOptions options) {
final Launcher launcher = Launcher.getLauncher(mView.getContext());
LauncherAppState app = LauncherAppState.getInstance(launcher);
Bitmap preview = null;
final float scale;
final Point dragOffset;
final Rect dragRegion;
if (mAddInfo instanceof PendingAddWidgetInfo) {
PendingAddWidgetInfo createWidgetInfo = (PendingAddWidgetInfo) mAddInfo;
int[] size = launcher.getWorkspace().estimateItemSize(createWidgetInfo, true, false);
int maxWidth = Math.min((int) (previewBitmapWidth * MAX_WIDGET_SCALE), size[0]);
int[] previewSizeBeforeScale = new int[1];
if (mPreview != null) {
preview = LivePreviewWidgetCell.generateFromRemoteViews(launcher, mPreview,
createWidgetInfo.info, maxWidth, previewSizeBeforeScale);
}
if (preview == null) {
preview = app.getWidgetCache().generateWidgetPreview(
launcher, createWidgetInfo.info, maxWidth, null, previewSizeBeforeScale);
}
if (previewSizeBeforeScale[0] < previewBitmapWidth) {
// The icon has extra padding around it.
int padding = (previewBitmapWidth - previewSizeBeforeScale[0]) / 2;
if (previewBitmapWidth > previewViewWidth) {
padding = padding * previewViewWidth / previewBitmapWidth;
}
previewBounds.left += padding;
previewBounds.right -= padding;
}
scale = previewBounds.width() / (float) preview.getWidth();
launcher.getDragController().addDragListener(new WidgetHostViewLoader(launcher, mView));
dragOffset = null;
dragRegion = null;
} else {
PendingAddShortcutInfo createShortcutInfo = (PendingAddShortcutInfo) mAddInfo;
Drawable icon = createShortcutInfo.activityInfo.getFullResIcon(app.getIconCache());
preview = LauncherIcons.createScaledBitmapWithoutShadow(icon, launcher);
mAddInfo.spanX = mAddInfo.spanY = 1;
scale = ((float) launcher.getDeviceProfile().iconSizePx) / preview.getWidth();
dragOffset = new Point(previewPadding / 2, previewPadding / 2);
// Create a preview same as the workspace cell size and draw the icon at the
// appropriate position.
int[] size = launcher.getWorkspace().estimateItemSize(mAddInfo, false, true);
DeviceProfile dp = launcher.getDeviceProfile();
int iconSize = dp.iconSizePx;
int padding = launcher.getResources()
.getDimensionPixelSize(R.dimen.widget_preview_shortcut_padding);
previewBounds.left += padding;
previewBounds.top += padding;
dragRegion = new Rect();
dragRegion.left = (size[0] - iconSize) / 2;
dragRegion.right = dragRegion.left + iconSize;
dragRegion.top = (size[1] - iconSize - dp.iconTextSizePx - dp.iconDrawablePaddingPx) / 2;
dragRegion.bottom = dragRegion.top + iconSize;
}
// Since we are not going through the workspace for starting the drag, set drag related
// information on the workspace before starting the drag.
launcher.getWorkspace().prepareDragWithProvider(this);
int dragLayerX = screenPos.x + previewBounds.left
+ (int) ((scale * preview.getWidth() - preview.getWidth()) / 2);
int dragLayerY = screenPos.y + previewBounds.top
+ (int) ((scale * preview.getHeight() - preview.getHeight()) / 2);
mPreviewBitmap = preview;
// Start the drag
launcher.getDragController().startDrag(preview, dragLayerX, dragLayerY, source, mAddInfo,
dragOffset, dragRegion, scale, options);
}
@Override
public Bitmap createDragOutline(Canvas canvas) {
if (mAddInfo instanceof PendingAddShortcutInfo) {
int width = mPreviewBitmap.getWidth();
int height = mPreviewBitmap.getHeight();
Bitmap b = Bitmap.createBitmap(width + blurSizeOutline, height + blurSizeOutline,
Bitmap.Config.ALPHA_8);
canvas.setBitmap(b);
Launcher launcher = Launcher.getLauncher(mView.getContext());
int size = launcher.getDeviceProfile().iconSizePx;
Rect src = new Rect(0, 0, mPreviewBitmap.getWidth(), mPreviewBitmap.getHeight());
Rect dst = new Rect(0, 0, size, size);
dst.offset(blurSizeOutline / 2, blurSizeOutline / 2);
canvas.drawBitmap(mPreviewBitmap, src, dst, new Paint(Paint.FILTER_BITMAP_FLAG));
HolographicOutlineHelper.getInstance(mView.getContext())
.applyExpensiveOutlineWithBlur(b, canvas);
canvas.setBitmap(null);
return b;
}
Workspace workspace = Launcher.getLauncher(mView.getContext()).getWorkspace();
int[] size = workspace.estimateItemSize(mAddInfo, false, false);
int w = size[0];
int h = size[1];
final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ALPHA_8);
canvas.setBitmap(b);
Rect src = new Rect(0, 0, mPreviewBitmap.getWidth(), mPreviewBitmap.getHeight());
float scaleFactor = Math.min((w - blurSizeOutline) / (float) mPreviewBitmap.getWidth(),
(h - blurSizeOutline) / (float) mPreviewBitmap.getHeight());
int scaledWidth = (int) (scaleFactor * mPreviewBitmap.getWidth());
int scaledHeight = (int) (scaleFactor * mPreviewBitmap.getHeight());
Rect dst = new Rect(0, 0, scaledWidth, scaledHeight);
// center the image
dst.offset((w - scaledWidth) / 2, (h - scaledHeight) / 2);
canvas.drawBitmap(mPreviewBitmap, src, dst, null);
HolographicOutlineHelper.getInstance(mView.getContext())
.applyExpensiveOutlineWithBlur(b, canvas);
canvas.setBitmap(null);
return b;
}
}
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