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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.graphics;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.Region.Op;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.widget.TextView;
import com.android.launcher3.HolographicOutlineHelper;
import com.android.launcher3.Launcher;
import com.android.launcher3.PreloadIconDrawable;
import com.android.launcher3.Workspace;
import com.android.launcher3.config.ProviderConfig;
import com.android.launcher3.folder.FolderIcon;
/**
* A utility class to generate preview bitmap for dragging.
*/
public class DragPreviewProvider {
public static final int DRAG_BITMAP_PADDING = 2;
private final Rect mTempRect = new Rect();
protected final View mView;
// The padding added to the drag view during the preview generation.
public final int previewPadding;
public Bitmap gerenatedDragOutline;
public DragPreviewProvider(View view) {
mView = view;
if (mView instanceof TextView) {
Drawable d = Workspace.getTextViewIcon((TextView) mView);
Rect bounds = getDrawableBounds(d);
previewPadding = DRAG_BITMAP_PADDING - bounds.left - bounds.top;
} else {
previewPadding = DRAG_BITMAP_PADDING;
}
}
/**
* Draws the {@link #mView} into the given {@param destCanvas}.
*/
private void drawDragView(Canvas destCanvas) {
destCanvas.save();
if (mView instanceof TextView) {
Drawable d = Workspace.getTextViewIcon((TextView) mView);
Rect bounds = getDrawableBounds(d);
destCanvas.translate(DRAG_BITMAP_PADDING / 2 - bounds.left,
DRAG_BITMAP_PADDING / 2 - bounds.top);
d.draw(destCanvas);
} else {
final Rect clipRect = mTempRect;
mView.getDrawingRect(clipRect);
boolean textVisible = false;
if (mView instanceof FolderIcon) {
// For FolderIcons the text can bleed into the icon area, and so we need to
// hide the text completely (which can't be achieved by clipping).
if (((FolderIcon) mView).getTextVisible()) {
((FolderIcon) mView).setTextVisible(false);
textVisible = true;
}
}
destCanvas.translate(-mView.getScrollX() + DRAG_BITMAP_PADDING / 2,
-mView.getScrollY() + DRAG_BITMAP_PADDING / 2);
destCanvas.clipRect(clipRect, Op.REPLACE);
mView.draw(destCanvas);
// Restore text visibility of FolderIcon if necessary
if (textVisible) {
((FolderIcon) mView).setTextVisible(true);
}
}
destCanvas.restore();
}
/**
* Returns a new bitmap to show when the {@link #mView} is being dragged around.
* Responsibility for the bitmap is transferred to the caller.
*/
public Bitmap createDragBitmap(Canvas canvas) {
Bitmap b;
if (mView instanceof TextView) {
Drawable d = Workspace.getTextViewIcon((TextView) mView);
Rect bounds = getDrawableBounds(d);
b = Bitmap.createBitmap(bounds.width() + DRAG_BITMAP_PADDING,
bounds.height() + DRAG_BITMAP_PADDING, Bitmap.Config.ARGB_8888);
} else {
b = Bitmap.createBitmap(mView.getWidth() + DRAG_BITMAP_PADDING,
mView.getHeight() + DRAG_BITMAP_PADDING, Bitmap.Config.ARGB_8888);
}
canvas.setBitmap(b);
drawDragView(canvas);
canvas.setBitmap(null);
return b;
}
public final void generateDragOutline(Canvas canvas) {
if (ProviderConfig.IS_DOGFOOD_BUILD && gerenatedDragOutline != null) {
throw new RuntimeException("Drag outline generated twice");
}
gerenatedDragOutline = createDragOutline(canvas);
}
/**
* Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
* Responsibility for the bitmap is transferred to the caller.
*/
public Bitmap createDragOutline(Canvas canvas) {
final Bitmap b = Bitmap.createBitmap(mView.getWidth() + DRAG_BITMAP_PADDING,
mView.getHeight() + DRAG_BITMAP_PADDING, Bitmap.Config.ALPHA_8);
canvas.setBitmap(b);
drawDragView(canvas);
HolographicOutlineHelper.obtain(mView.getContext())
.applyExpensiveOutlineWithBlur(b, canvas);
canvas.setBitmap(null);
return b;
}
protected static Rect getDrawableBounds(Drawable d) {
Rect bounds = new Rect();
d.copyBounds(bounds);
if (bounds.width() == 0 || bounds.height() == 0) {
bounds.set(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
} else {
bounds.offsetTo(0, 0);
}
if (d instanceof PreloadIconDrawable) {
int inset = -((PreloadIconDrawable) d).getOutset();
bounds.inset(inset, inset);
}
return bounds;
}
public float getScaleAndPosition(Bitmap preview, int[] outPos) {
float scale = Launcher.getLauncher(mView.getContext())
.getDragLayer().getLocationInDragLayer(mView, outPos);
outPos[0] = Math.round(outPos[0] - (preview.getWidth() - scale * mView.getWidth()) / 2);
outPos[1] = Math.round(outPos[1] - (1 - scale) * preview.getHeight() / 2 - previewPadding / 2);
return scale;
}
}
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