| /* |
| * 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.Animator; |
| import android.animation.AnimatorListenerAdapter; |
| import android.content.Context; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.animation.AccelerateInterpolator; |
| import android.widget.FrameLayout; |
| |
| import com.android.launcher3.dragndrop.DragController; |
| |
| /** |
| * Base class for drop target bars (where you can drop apps to do actions such as uninstall). |
| */ |
| public abstract class BaseDropTargetBar extends FrameLayout implements DragController.DragListener { |
| protected static final int DEFAULT_DRAG_FADE_DURATION = 175; |
| |
| protected View mDropTargetBar; |
| |
| protected LauncherViewPropertyAnimator mDropTargetBarAnimator; |
| protected static final AccelerateInterpolator sAccelerateInterpolator = |
| new AccelerateInterpolator(); |
| protected boolean mAccessibilityEnabled = false; |
| |
| protected boolean mDeferOnDragEnd; |
| |
| public BaseDropTargetBar(Context context, AttributeSet attrs) { |
| this(context, attrs, 0); |
| } |
| |
| public BaseDropTargetBar(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| } |
| |
| @Override |
| protected void onFinishInflate() { |
| super.onFinishInflate(); |
| |
| mDropTargetBar = findViewById(R.id.drag_target_bar); |
| |
| // Create the various fade animations |
| mDropTargetBar.setAlpha(0f); |
| mDropTargetBarAnimator = new LauncherViewPropertyAnimator(mDropTargetBar); |
| mDropTargetBarAnimator.setInterpolator(sAccelerateInterpolator); |
| mDropTargetBarAnimator.addListener(new AnimatorListenerAdapter() { |
| @Override |
| public void onAnimationStart(Animator animation) { |
| // Ensure that the view is visible for the animation |
| mDropTargetBar.setVisibility(View.VISIBLE); |
| } |
| |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| if (mDropTargetBar != null) { |
| AlphaUpdateListener.updateVisibility(mDropTargetBar, mAccessibilityEnabled); |
| } |
| } |
| }); |
| } |
| |
| |
| /** |
| * Convenience method to animate the alpha of a view using hardware layers. |
| */ |
| protected void animateViewAlpha(LauncherViewPropertyAnimator animator, View v, float alpha, |
| int duration) { |
| if (v == null) { |
| return; |
| } |
| |
| animator.cancel(); |
| if (Float.compare(v.getAlpha(), alpha) != 0) { |
| if (duration > 0) { |
| animator.alpha(alpha).withLayer().setDuration(duration).start(); |
| } else { |
| v.setAlpha(alpha); |
| AlphaUpdateListener.updateVisibility(v, mAccessibilityEnabled); |
| } |
| } |
| } |
| |
| /* |
| * DragController.DragListener implementation |
| */ |
| @Override |
| public void onDragStart(DragSource source, ItemInfo info, int dragAction) { |
| showDropTargets(); |
| } |
| |
| /** |
| * This is called to defer hiding the delete drop target until the drop animation has completed, |
| * instead of hiding immediately when the drag has ended. |
| */ |
| protected void deferOnDragEnd() { |
| mDeferOnDragEnd = true; |
| } |
| |
| @Override |
| public void onDragEnd() { |
| if (!mDeferOnDragEnd) { |
| hideDropTargets(); |
| } else { |
| mDeferOnDragEnd = false; |
| } |
| } |
| |
| public abstract void showDropTargets(); |
| |
| public abstract void hideDropTargets(); |
| |
| public abstract void enableAccessibleDrag(boolean enable); |
| |
| public abstract void setup(Launcher launcher, DragController dragController); |
| } |