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Resue TaskView information.

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am: 0a5e2d6b93

Change-Id: I0d998b0e31dedb48ef284386811fe67fbda6c981
This commit is contained in:
Jiaquan He
2016-12-28 23:58:49 +00:00
committed by android-build-merger
parent eb609a3d0f 0a5e2d6b93
commit e6dd53291e
1 changed files with 76 additions and 35 deletions
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111
packages/SystemUI/src/com/android/systemui/recents/views/grid/TaskGridLayoutAlgorithm.java
View File

@@ -52,6 +52,69 @@ public class TaskGridLayoutAlgorithm {
private float mAppAspectRatio;
private Rect mSystemInsets = new Rect();
/**
* When the amount of tasks is determined, the size and position of every task view can be
* decided. Each instance of TaskGridRectInfo store the task view information for a certain
* amount of tasks.
*/
class TaskGridRectInfo {
Rect size;
int[] xOffsets;
int[] yOffsets;
public TaskGridRectInfo(int taskCount) {
size = new Rect();
xOffsets = new int[taskCount];
yOffsets = new int[taskCount];
int layoutTaskCount = Math.min(MAX_LAYOUT_TASK_COUNT, taskCount);
int tasksPerLine = layoutTaskCount < 2 ? 1 : (
layoutTaskCount < 5 ? 2 : (
layoutTaskCount < 7 ? 3 : 4));
int lines = layoutTaskCount < 3 ? 1 : 2;
int taskWidth, taskHeight;
int maxTaskWidth = (mDisplayRect.width() - 2 * mPaddingLeftRight
- (tasksPerLine - 1) * mPaddingTaskView) / tasksPerLine;
int maxTaskHeight = (mDisplayRect.height() - 2 * mPaddingTopBottom
- (lines - 1) * mPaddingTaskView) / lines;
if (maxTaskHeight >= maxTaskWidth / mAppAspectRatio + mTitleBarHeight) {
// Width bound.
taskWidth = maxTaskWidth;
taskHeight = (int) (maxTaskWidth / mAppAspectRatio + mTitleBarHeight);
} else {
// Height bound.
taskHeight = maxTaskHeight;
taskWidth = (int) ((taskHeight - mTitleBarHeight) * mAppAspectRatio);
}
size.set(0, 0, taskWidth, taskHeight);
int emptySpaceX = mDisplayRect.width() - 2 * mPaddingLeftRight
- (tasksPerLine * taskWidth) - (tasksPerLine - 1) * mPaddingTaskView;
int emptySpaceY = mDisplayRect.height() - 2 * mPaddingTopBottom
- (lines * taskHeight) - (lines - 1) * mPaddingTaskView;
for (int taskIndex = 0; taskIndex < taskCount; taskIndex++) {
// We also need to invert the index in order to display the most recent tasks first.
int taskLayoutIndex = taskCount - taskIndex - 1;
int xIndex = taskLayoutIndex % tasksPerLine;
int yIndex = taskLayoutIndex / tasksPerLine;
xOffsets[taskIndex] =
emptySpaceX / 2 + mPaddingLeftRight + (taskWidth + mPaddingTaskView) * xIndex;
yOffsets[taskIndex] =
emptySpaceY / 2 + mPaddingTopBottom + (taskHeight + mPaddingTaskView) * yIndex;
}
}
}
/**
* We can find task view sizes and positions from mTaskGridRectInfoList[k - 1] when there
* are k tasks.
*/
TaskGridRectInfo[] mTaskGridRectInfoList;
public TaskGridLayoutAlgorithm(Context context) {
reloadOnConfigurationChange(context);
}
@@ -75,46 +138,17 @@ public class TaskGridLayoutAlgorithm {
public TaskViewTransform getTransform(int taskIndex, int taskCount,
TaskViewTransform transformOut, TaskStackLayoutAlgorithm stackLayout) {
int layoutTaskCount = Math.min(MAX_LAYOUT_TASK_COUNT, taskCount);
TaskGridRectInfo gridInfo = mTaskGridRectInfoList[taskCount - 1];
mTaskGridRect.set(gridInfo.size);
// We also need to invert the index in order to display the most recent tasks first.
int taskLayoutIndex = taskCount - taskIndex - 1;
int tasksPerLine = layoutTaskCount < 2 ? 1 : (
layoutTaskCount < 5 ? 2 : (
layoutTaskCount < 7 ? 3 : 4));
int lines = layoutTaskCount < 3 ? 1 : 2;
int taskWidth, taskHeight;
int maxTaskWidth = (mDisplayRect.width() - 2 * mPaddingLeftRight
- (tasksPerLine - 1) * mPaddingTaskView) / tasksPerLine;
int maxTaskHeight = (mDisplayRect.height() - 2 * mPaddingTopBottom
- (lines - 1) * mPaddingTaskView) / lines;
if (maxTaskHeight >= maxTaskWidth / mAppAspectRatio + mTitleBarHeight) {
// Width bound.
taskWidth = maxTaskWidth;
taskHeight = (int) (maxTaskWidth / mAppAspectRatio + mTitleBarHeight);
} else {
// Height bound.
taskHeight = maxTaskHeight;
taskWidth = (int) ((taskHeight - mTitleBarHeight) * mAppAspectRatio);
}
int emptySpaceX = mDisplayRect.width() - 2 * mPaddingLeftRight
- (tasksPerLine * taskWidth) - (tasksPerLine - 1) * mPaddingTaskView;
int emptySpaceY = mDisplayRect.height() - 2 * mPaddingTopBottom
- (lines * taskHeight) - (lines - 1) * mPaddingTaskView;
mTaskGridRect.set(0, 0, taskWidth, taskHeight);
int xIndex = taskLayoutIndex % tasksPerLine;
int yIndex = taskLayoutIndex / tasksPerLine;
int x = emptySpaceX / 2 + mPaddingLeftRight + (taskWidth + mPaddingTaskView) * xIndex;
int y = emptySpaceY / 2 + mPaddingTopBottom + (taskHeight + mPaddingTaskView) * yIndex;
int x = gridInfo.xOffsets[taskIndex];
int y = gridInfo.yOffsets[taskIndex];
float z = stackLayout.mMaxTranslationZ;
float dimAlpha = 0f;
float viewOutlineAlpha = 0f;
// We also need to invert the index in order to display the most recent tasks first.
int taskLayoutIndex = taskCount - taskIndex - 1;
boolean isTaskViewVisible = (taskLayoutIndex < MAX_LAYOUT_TASK_COUNT);
// Fill out the transform
@@ -134,6 +168,13 @@ public class TaskGridLayoutAlgorithm {
public void initialize(Rect displayRect, Rect windowRect) {
mDisplayRect = displayRect;
mWindowRect = windowRect;
// Pre-calculate the positions and offsets of task views so that we can reuse them directly
// in the future.
mTaskGridRectInfoList = new TaskGridRectInfo[MAX_LAYOUT_TASK_COUNT];
for (int i = 0; i < MAX_LAYOUT_TASK_COUNT; i++) {
mTaskGridRectInfoList[i] = new TaskGridRectInfo(i + 1);
}
}
public void setSystemInsets(Rect systemInsets) {