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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 static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.view.View;
import androidx.annotation.Nullable;
import com.android.launcher3.BubbleTextView;
import com.android.launcher3.Launcher;
import com.android.launcher3.R;
import com.android.launcher3.config.FeatureFlags;
import com.android.launcher3.dragndrop.DraggableView;
import com.android.launcher3.icons.BitmapRenderer;
import com.android.launcher3.icons.FastBitmapDrawable;
import com.android.launcher3.util.SafeCloseable;
import com.android.launcher3.widget.LauncherAppWidgetHostView;
import java.nio.ByteBuffer;
/**
* A utility class to generate preview bitmap for dragging.
*/
public class DragPreviewProvider {
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 final int blurSizeOutline;
private OutlineGeneratorCallback mOutlineGeneratorCallback;
public Bitmap generatedDragOutline;
public DragPreviewProvider(View view) {
this(view, view.getContext());
}
public DragPreviewProvider(View view, Context context) {
mView = view;
blurSizeOutline =
context.getResources().getDimensionPixelSize(R.dimen.blur_size_medium_outline);
previewPadding = blurSizeOutline;
}
/**
* Draws the {@link #mView} into the given {@param destCanvas}.
*/
protected void drawDragView(Canvas destCanvas, float scale) {
int saveCount = destCanvas.save();
destCanvas.scale(scale, scale);
if (mView instanceof DraggableView) {
DraggableView dv = (DraggableView) mView;
try (SafeCloseable t = dv.prepareDrawDragView()) {
dv.getSourceVisualDragBounds(mTempRect);
destCanvas.translate(blurSizeOutline / 2 - mTempRect.left,
blurSizeOutline / 2 - mTempRect.top);
mView.draw(destCanvas);
}
}
destCanvas.restoreToCount(saveCount);
}
/**
* Returns a new drawable to show when the {@link #mView} is being dragged around.
* Responsibility for the drawable is transferred to the caller.
*/
public Drawable createDrawable() {
if (mView instanceof LauncherAppWidgetHostView) {
return null;
}
int width = 0;
int height = 0;
// Assume scaleX == scaleY, which is always the case for workspace items.
float scale = mView.getScaleX();
if (mView instanceof DraggableView) {
((DraggableView) mView).getSourceVisualDragBounds(mTempRect);
width = mTempRect.width();
height = mTempRect.height();
} else {
width = mView.getWidth();
height = mView.getHeight();
}
return new FastBitmapDrawable(
BitmapRenderer.createHardwareBitmap(width + blurSizeOutline,
height + blurSizeOutline, (c) -> drawDragView(c, scale)));
}
/**
* Returns the content view if the content should be rendered directly in
* {@link com.android.launcher3.dragndrop.DragView}. Otherwise, returns null.
*/
@Nullable
public View getContentView() {
if (mView instanceof LauncherAppWidgetHostView) {
return mView;
}
return null;
}
public final void generateDragOutline(Bitmap preview) {
if (FeatureFlags.IS_STUDIO_BUILD && mOutlineGeneratorCallback != null) {
throw new RuntimeException("Drag outline generated twice");
}
mOutlineGeneratorCallback = new OutlineGeneratorCallback(preview);
UI_HELPER_EXECUTOR.post(mOutlineGeneratorCallback);
}
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);
}
return bounds;
}
public float getScaleAndPosition(Drawable preview, int[] outPos) {
float scale = Launcher.getLauncher(mView.getContext())
.getDragLayer().getLocationInDragLayer(mView, outPos);
if (mView instanceof LauncherAppWidgetHostView) {
// App widgets are technically scaled, but are drawn at their expected size -- so the
// app widget scale should not affect the scale of the preview.
scale /= ((LauncherAppWidgetHostView) mView).getScaleToFit();
}
outPos[0] = Math.round(outPos[0] -
(preview.getIntrinsicWidth() - scale * mView.getWidth() * mView.getScaleX()) / 2);
outPos[1] = Math.round(outPos[1] - (1 - scale) * preview.getIntrinsicHeight() / 2
- previewPadding / 2);
return scale;
}
/** Returns the scale and position of a given view for drag-n-drop. */
public float getScaleAndPosition(View view, int[] outPos) {
float scale = Launcher.getLauncher(mView.getContext())
.getDragLayer().getLocationInDragLayer(mView, outPos);
if (mView instanceof LauncherAppWidgetHostView) {
// App widgets are technically scaled, but are drawn at their expected size -- so the
// app widget scale should not affect the scale of the preview.
scale /= ((LauncherAppWidgetHostView) mView).getScaleToFit();
}
outPos[0] = Math.round(outPos[0]
- (view.getWidth() - scale * mView.getWidth() * mView.getScaleX()) / 2);
outPos[1] = Math.round(outPos[1] - (1 - scale) * view.getHeight() / 2 - previewPadding / 2);
return scale;
}
protected Bitmap convertPreviewToAlphaBitmap(Bitmap preview) {
return preview.copy(Bitmap.Config.ALPHA_8, true);
}
private class OutlineGeneratorCallback implements Runnable {
private final Bitmap mPreviewSnapshot;
private final Context mContext;
private final boolean mIsIcon;
OutlineGeneratorCallback(Bitmap preview) {
mPreviewSnapshot = preview;
mContext = mView.getContext();
mIsIcon = mView instanceof BubbleTextView;
}
@Override
public void run() {
Bitmap preview = convertPreviewToAlphaBitmap(mPreviewSnapshot);
if (mIsIcon) {
int size = Launcher.getLauncher(mContext).getDeviceProfile().iconSizePx;
preview = Bitmap.createScaledBitmap(preview, size, size, false);
}
//else case covers AppWidgetHost (doesn't drag/drop across different device profiles)
// We start by removing most of the alpha channel so as to ignore shadows, and
// other types of partial transparency when defining the shape of the object
byte[] pixels = new byte[preview.getWidth() * preview.getHeight()];
ByteBuffer buffer = ByteBuffer.wrap(pixels);
buffer.rewind();
preview.copyPixelsToBuffer(buffer);
for (int i = 0; i < pixels.length; i++) {
if ((pixels[i] & 0xFF) < 188) {
pixels[i] = 0;
}
}
buffer.rewind();
preview.copyPixelsFromBuffer(buffer);
final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
Canvas canvas = new Canvas();
// calculate the outer blur first
paint.setMaskFilter(new BlurMaskFilter(blurSizeOutline, BlurMaskFilter.Blur.OUTER));
int[] outerBlurOffset = new int[2];
Bitmap thickOuterBlur = preview.extractAlpha(paint, outerBlurOffset);
paint.setMaskFilter(new BlurMaskFilter(
mContext.getResources().getDimension(R.dimen.blur_size_thin_outline),
BlurMaskFilter.Blur.OUTER));
int[] brightOutlineOffset = new int[2];
Bitmap brightOutline = preview.extractAlpha(paint, brightOutlineOffset);
// calculate the inner blur
canvas.setBitmap(preview);
canvas.drawColor(0xFF000000, PorterDuff.Mode.SRC_OUT);
paint.setMaskFilter(new BlurMaskFilter(blurSizeOutline, BlurMaskFilter.Blur.NORMAL));
int[] thickInnerBlurOffset = new int[2];
Bitmap thickInnerBlur = preview.extractAlpha(paint, thickInnerBlurOffset);
// mask out the inner blur
paint.setMaskFilter(null);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
canvas.setBitmap(thickInnerBlur);
canvas.drawBitmap(preview, -thickInnerBlurOffset[0],
-thickInnerBlurOffset[1], paint);
canvas.drawRect(0, 0, -thickInnerBlurOffset[0], thickInnerBlur.getHeight(), paint);
canvas.drawRect(0, 0, thickInnerBlur.getWidth(), -thickInnerBlurOffset[1], paint);
// draw the inner and outer blur
paint.setXfermode(null);
canvas.setBitmap(preview);
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
canvas.drawBitmap(thickInnerBlur, thickInnerBlurOffset[0], thickInnerBlurOffset[1],
paint);
canvas.drawBitmap(thickOuterBlur, outerBlurOffset[0], outerBlurOffset[1], paint);
// draw the bright outline
canvas.drawBitmap(brightOutline, brightOutlineOffset[0], brightOutlineOffset[1], paint);
// cleanup
canvas.setBitmap(null);
brightOutline.recycle();
thickOuterBlur.recycle();
thickInnerBlur.recycle();
generatedDragOutline = preview;
}
}
}