/*
* Copyright (C) 2014 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.systemui.recents.views;
import com.android.systemui.recents.Constants;
import com.android.systemui.recents.RecentsConfiguration;
import com.android.systemui.recents.model.Task;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/* The layout logic for a TaskStackView */
public class TaskStackViewFilterAlgorithm {
RecentsConfiguration mConfig;
TaskStackView mStackView;
ViewPool<TaskView, Task> mViewPool;
public TaskStackViewFilterAlgorithm(RecentsConfiguration config, TaskStackView stackView,
ViewPool<TaskView, Task> viewPool) {
mConfig = config;
mStackView = stackView;
mViewPool = viewPool;
}
/** Orchestrates the animations of the current child views and any new views. */
void startFilteringAnimation(ArrayList<Task> curTasks,
ArrayList<TaskViewTransform> curTaskTransforms,
final ArrayList<Task> tasks,
final ArrayList<TaskViewTransform> taskTransforms) {
// Calculate the transforms to animate out all the existing views if they are not in the
// new visible range (or to their final positions in the stack if they are)
final ArrayList<TaskView> childrenToRemove = new ArrayList<TaskView>();
final HashMap<TaskView, TaskViewTransform> childViewTransforms =
new HashMap<TaskView, TaskViewTransform>();
int duration = getExitTransformsForFilterAnimation(curTasks, curTaskTransforms, tasks,
taskTransforms, childViewTransforms, childrenToRemove);
// If all the current views are in the visible range of the new stack, then don't wait for
// views to animate out and animate all the new views into their place
final boolean unifyNewViewAnimation = childrenToRemove.isEmpty();
if (unifyNewViewAnimation) {
int inDuration = getEnterTransformsForFilterAnimation(tasks, taskTransforms,
childViewTransforms);
duration = Math.max(duration, inDuration);
}
// Animate all the views to their final transforms
for (final TaskView tv : childViewTransforms.keySet()) {
TaskViewTransform t = childViewTransforms.get(tv);
tv.animate().cancel();
tv.animate()
.withEndAction(new Runnable() {
@Override
public void run() {
childViewTransforms.remove(tv);
if (childViewTransforms.isEmpty()) {
// Return all the removed children to the view pool
for (TaskView tv : childrenToRemove) {
mViewPool.returnViewToPool(tv);
}
if (!unifyNewViewAnimation) {
// For views that are not already visible, animate them in
childViewTransforms.clear();
int duration = getEnterTransformsForFilterAnimation(tasks,
taskTransforms, childViewTransforms);
for (final TaskView tv : childViewTransforms.keySet()) {
TaskViewTransform t = childViewTransforms.get(tv);
tv.updateViewPropertiesToTaskTransform(t, duration);
}
}
}
}
});
tv.updateViewPropertiesToTaskTransform(t, duration);
}
}
/**
* Creates the animations for all the children views that need to be animated in when we are
* un/filtering a stack, and returns the duration for these animations.
*/
int getEnterTransformsForFilterAnimation(ArrayList<Task> tasks,
ArrayList<TaskViewTransform> taskTransforms,
HashMap<TaskView, TaskViewTransform> childViewTransformsOut) {
int offset = 0;
int movement = 0;
int taskCount = tasks.size();
for (int i = taskCount - 1; i >= 0; i--) {
Task task = tasks.get(i);
TaskViewTransform toTransform = taskTransforms.get(i);
if (toTransform.visible) {
TaskView tv = mStackView.getChildViewForTask(task);
if (tv == null) {
// For views that are not already visible, animate them in
tv = mViewPool.pickUpViewFromPool(task, task);
// Compose a new transform to fade and slide the new task in
TaskViewTransform fromTransform = new TaskViewTransform(toTransform);
tv.prepareTaskTransformForFilterTaskHidden(fromTransform);
tv.updateViewPropertiesToTaskTransform(fromTransform, 0);
toTransform.startDelay = offset * Constants.Values.TaskStackView.FilterStartDelay;
childViewTransformsOut.put(tv, toTransform);
// Use the movement of the new views to calculate the duration of the animation
movement = Math.max(movement,
Math.abs(toTransform.translationY - fromTransform.translationY));
offset++;
}
}
}
return mConfig.filteringNewViewsAnimDuration;
}
/**
* Creates the animations for all the children views that need to be removed or to move views
* to their un/filtered position when we are un/filtering a stack, and returns the duration
* for these animations.
*/
int getExitTransformsForFilterAnimation(ArrayList<Task> curTasks,
ArrayList<TaskViewTransform> curTaskTransforms,
ArrayList<Task> tasks, ArrayList<TaskViewTransform> taskTransforms,
HashMap<TaskView, TaskViewTransform> childViewTransformsOut,
ArrayList<TaskView> childrenToRemoveOut) {
// Animate all of the existing views out of view (if they are not in the visible range in
// the new stack) or to their final positions in the new stack
int offset = 0;
int movement = 0;
List<TaskView> taskViews = mStackView.getTaskViews();
int taskViewCount = taskViews.size();
for (int i = 0; i < taskViewCount; i++) {
TaskView tv = taskViews.get(i);
Task task = tv.getTask();
int taskIndex = tasks.indexOf(task);
TaskViewTransform toTransform;
// If the view is no longer visible, then we should just animate it out
boolean willBeInvisible = taskIndex < 0 || !taskTransforms.get(taskIndex).visible;
if (willBeInvisible) {
if (taskIndex < 0) {
toTransform = curTaskTransforms.get(curTasks.indexOf(task));
} else {
toTransform = new TaskViewTransform(taskTransforms.get(taskIndex));
}
tv.prepareTaskTransformForFilterTaskVisible(toTransform);
childrenToRemoveOut.add(tv);
} else {
toTransform = taskTransforms.get(taskIndex);
// Use the movement of the visible views to calculate the duration of the animation
movement = Math.max(movement, Math.abs(toTransform.translationY -
(int) tv.getTranslationY()));
}
toTransform.startDelay = offset * Constants.Values.TaskStackView.FilterStartDelay;
childViewTransformsOut.put(tv, toTransform);
offset++;
}
return mConfig.filteringCurrentViewsAnimDuration;
}
}