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/*
* Copyright (C) 2021 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.dragndrop;
import static com.android.launcher3.AbstractFloatingView.TYPE_DISCOVERY_BOUNCE;
import static com.android.launcher3.LauncherAnimUtils.SPRING_LOADED_EXIT_DELAY;
import static com.android.launcher3.LauncherState.NORMAL;
import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
import android.content.res.Resources;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.view.HapticFeedbackConstants;
import android.view.View;
import androidx.annotation.Nullable;
import com.android.launcher3.AbstractFloatingView;
import com.android.launcher3.DragSource;
import com.android.launcher3.DropTarget;
import com.android.launcher3.Launcher;
import com.android.launcher3.R;
import com.android.launcher3.accessibility.DragViewStateAnnouncer;
import com.android.launcher3.model.data.ItemInfo;
/**
* Drag controller for Launcher activity
*/
public class LauncherDragController extends DragController<Launcher> {
private static final boolean PROFILE_DRAWING_DURING_DRAG = false;
private final FlingToDeleteHelper mFlingToDeleteHelper;
public LauncherDragController(Launcher launcher) {
super(launcher);
mFlingToDeleteHelper = new FlingToDeleteHelper(launcher);
}
@Override
protected DragView startDrag(
@Nullable Drawable drawable,
@Nullable View view,
DraggableView originalView,
int dragLayerX,
int dragLayerY,
DragSource source,
ItemInfo dragInfo,
Rect dragRegion,
float initialDragViewScale,
float dragViewScaleOnDrop,
DragOptions options) {
if (PROFILE_DRAWING_DURING_DRAG) {
android.os.Debug.startMethodTracing("Launcher");
}
mActivity.hideKeyboard();
AbstractFloatingView.closeOpenViews(mActivity, false, TYPE_DISCOVERY_BOUNCE);
mOptions = options;
if (mOptions.simulatedDndStartPoint != null) {
mLastTouch.x = mMotionDown.x = mOptions.simulatedDndStartPoint.x;
mLastTouch.y = mMotionDown.y = mOptions.simulatedDndStartPoint.y;
}
final int registrationX = mMotionDown.x - dragLayerX;
final int registrationY = mMotionDown.y - dragLayerY;
final int dragRegionLeft = dragRegion == null ? 0 : dragRegion.left;
final int dragRegionTop = dragRegion == null ? 0 : dragRegion.top;
mLastDropTarget = null;
mDragObject = new DropTarget.DragObject(mActivity.getApplicationContext());
mDragObject.originalView = originalView;
mIsInPreDrag = mOptions.preDragCondition != null
&& !mOptions.preDragCondition.shouldStartDrag(0);
final Resources res = mActivity.getResources();
final float scaleDps = mIsInPreDrag
? res.getDimensionPixelSize(R.dimen.pre_drag_view_scale) : 0f;
final DragView dragView = mDragObject.dragView = drawable != null
? new LauncherDragView(
mActivity,
drawable,
registrationX,
registrationY,
initialDragViewScale,
dragViewScaleOnDrop,
scaleDps)
: new LauncherDragView(
mActivity,
view,
view.getMeasuredWidth(),
view.getMeasuredHeight(),
registrationX,
registrationY,
initialDragViewScale,
dragViewScaleOnDrop,
scaleDps);
dragView.setItemInfo(dragInfo);
mDragObject.dragComplete = false;
mDragObject.xOffset = mMotionDown.x - (dragLayerX + dragRegionLeft);
mDragObject.yOffset = mMotionDown.y - (dragLayerY + dragRegionTop);
mDragDriver = DragDriver.create(this, mOptions, mFlingToDeleteHelper::recordMotionEvent);
if (!mOptions.isAccessibleDrag) {
mDragObject.stateAnnouncer = DragViewStateAnnouncer.createFor(dragView);
}
mDragObject.dragSource = source;
mDragObject.dragInfo = dragInfo;
mDragObject.originalDragInfo = mDragObject.dragInfo.makeShallowCopy();
if (mOptions.preDragCondition != null) {
dragView.setHasDragOffset(mOptions.preDragCondition.getDragOffset().x != 0 ||
mOptions.preDragCondition.getDragOffset().y != 0);
}
if (dragRegion != null) {
dragView.setDragRegion(new Rect(dragRegion));
}
mActivity.getDragLayer().performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
dragView.show(mLastTouch.x, mLastTouch.y);
mDistanceSinceScroll = 0;
if (!mIsInPreDrag) {
callOnDragStart();
} else if (mOptions.preDragCondition != null) {
mOptions.preDragCondition.onPreDragStart(mDragObject);
}
handleMoveEvent(mLastTouch.x, mLastTouch.y);
if (!mActivity.isTouchInProgress() && options.simulatedDndStartPoint == null) {
// If it is an internal drag and the touch is already complete, cancel immediately
MAIN_EXECUTOR.submit(this::cancelDrag);
}
return dragView;
}
@Override
protected void exitDrag() {
mActivity.getStateManager().goToState(NORMAL, SPRING_LOADED_EXIT_DELAY);
}
@Override
protected boolean endWithFlingAnimation() {
Runnable flingAnimation = mFlingToDeleteHelper.getFlingAnimation(mDragObject, mOptions);
if (flingAnimation != null) {
drop(mFlingToDeleteHelper.getDropTarget(), flingAnimation);
return true;
}
return super.endWithFlingAnimation();
}
@Override
protected void endDrag() {
super.endDrag();
mFlingToDeleteHelper.releaseVelocityTracker();
}
@Override
protected DropTarget getDefaultDropTarget(int[] dropCoordinates) {
mActivity.getDragLayer().mapCoordInSelfToDescendant(mActivity.getWorkspace(),
dropCoordinates);
return mActivity.getWorkspace();
}
}