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/*
* Copyright (C) 2011 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;
import android.animation.TimeInterpolator;
import android.content.Context;
import android.graphics.PointF;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AnimationUtils;
import com.android.launcher3.dragndrop.DragLayer;
import com.android.launcher3.dragndrop.DragOptions;
import com.android.launcher3.folder.Folder;
import com.android.launcher3.util.FlingAnimation;
import com.android.launcher3.util.Thunk;
public class DeleteDropTarget extends ButtonDropTarget {
public DeleteDropTarget(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DeleteDropTarget(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
// Get the hover color
mHoverColor = getResources().getColor(R.color.delete_target_hover_tint);
setDrawable(R.drawable.ic_remove_launcher);
}
@Override
public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
super.onDragStart(dragObject, options);
setTextBasedOnDragSource(dragObject.dragSource);
}
/** @return true for items that should have a "Remove" action in accessibility. */
public static boolean supportsAccessibleDrop(ItemInfo info) {
return (info instanceof ShortcutInfo)
|| (info instanceof LauncherAppWidgetInfo)
|| (info instanceof FolderInfo);
}
@Override
protected boolean supportsDrop(DragSource source, ItemInfo info) {
return true;
}
/**
* Set the drop target's text to either "Remove" or "Cancel" depending on the drag source.
*/
public void setTextBasedOnDragSource(DragSource dragSource) {
if (!TextUtils.isEmpty(getText())) {
setText(dragSource.supportsDeleteDropTarget() ? R.string.remove_drop_target_label
: android.R.string.cancel);
}
}
@Override
@Thunk void completeDrop(DragObject d) {
ItemInfo item = d.dragInfo;
if ((d.dragSource instanceof Workspace) || (d.dragSource instanceof Folder)) {
removeWorkspaceOrFolderItem(mLauncher, item, null);
}
}
/**
* Removes the item from the workspace. If the view is not null, it also removes the view.
*/
public static void removeWorkspaceOrFolderItem(Launcher launcher, ItemInfo item, View view) {
// Remove the item from launcher and the db, we can ignore the containerInfo in this call
// because we already remove the drag view from the folder (if the drag originated from
// a folder) in Folder.beginDrag()
launcher.removeItem(view, item, true /* deleteFromDb */);
launcher.getWorkspace().stripEmptyScreens();
launcher.getDragLayer().announceForAccessibility(launcher.getString(R.string.item_removed));
}
@Override
public void onFlingToDelete(final DragObject d, PointF vel) {
// Don't highlight the icon as it's animating
d.dragView.setColor(0);
final DragLayer dragLayer = mLauncher.getDragLayer();
FlingAnimation fling = new FlingAnimation(d, vel,
getIconRect(d.dragView.getMeasuredWidth(), d.dragView.getMeasuredHeight(),
mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight()),
dragLayer);
final int duration = fling.getDuration();
final long startTime = AnimationUtils.currentAnimationTimeMillis();
// NOTE: Because it takes time for the first frame of animation to actually be
// called and we expect the animation to be a continuation of the fling, we have
// to account for the time that has elapsed since the fling finished. And since
// we don't have a startDelay, we will always get call to update when we call
// start() (which we want to ignore).
final TimeInterpolator tInterpolator = new TimeInterpolator() {
private int mCount = -1;
private float mOffset = 0f;
@Override
public float getInterpolation(float t) {
if (mCount < 0) {
mCount++;
} else if (mCount == 0) {
mOffset = Math.min(0.5f, (float) (AnimationUtils.currentAnimationTimeMillis() -
startTime) / duration);
mCount++;
}
return Math.min(1f, mOffset + t);
}
};
Runnable onAnimationEndRunnable = new Runnable() {
@Override
public void run() {
mLauncher.exitSpringLoadedDragMode();
completeDrop(d);
mLauncher.getDragController().onDeferredEndFling(d);
}
};
dragLayer.animateView(d.dragView, fling, duration, tInterpolator, onAnimationEndRunnable,
DragLayer.ANIMATION_END_DISAPPEAR, null);
}
}
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