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Ensuring that tasks in the back are always visible.

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Change-Id: Ic64a1eac4b312c1efdb8c3ab005903a53b4a61d2
This commit is contained in:
Winson
2015-10-30 16:03:08 -07:00
parent 3e9964ffdb
commit 0711be5cef
1 changed files with 17 additions and 10 deletions
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27
packages/SystemUI/src/com/android/systemui/recents/views/TaskStackLayoutAlgorithm.java
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@@ -44,6 +44,8 @@ public class TaskStackLayoutAlgorithm {
private static final float STACK_PEEK_MIN_SCALE = 0.85f;
// The scale of the last task
private static final float SINGLE_TASK_SCALE = 0.95f;
// The percentage of the height of the stack that we want to show the last task at
private static final float VISIBLE_LAST_TASK_HEIGHT_PCT = 0.45f;
// The percentage of height of task to show between tasks
private static final float VISIBLE_TASK_HEIGHT_BETWEEN_TASKS = 0.5f;
// The percentage between the maxStackScroll and the maxScroll where a given scroll will still
@@ -316,15 +318,20 @@ public class TaskStackLayoutAlgorithm {
mFrontMostTaskP = pAtFrontMostTaskTop;
// Set the stack end scroll progress to the point at which the bottom of the front-most
// task is aligned to the bottom of the stack
mStackEndScrollP = alignToStackBottom(pAtFrontMostTaskTop,
mTaskHeightPOffset);
// Set the preferred stack end scroll progress to the point where the bottom of the
// front-most task is offset by the navbar and padding from the bottom of the stack
mPreferredStackEndScrollP = mStackEndScrollP + mStackBottomPOffset;
// Basically align the back-most task such that its progress is the same as the top of
// the front most task at the max stack scroll
mMinScrollP = alignToStackBottom(pAtBackMostTaskTop,
mStackBottomPOffset + mTaskHeightPOffset);
mStackEndScrollP = alignToStackBottom(pAtFrontMostTaskTop, mTaskHeightPOffset);
if (mNumStackTasks > 1) {
// Set the preferred stack end scroll progress to the point where the bottom of the
// front-most task is offset by the navbar and padding from the bottom of the stack
mPreferredStackEndScrollP = mStackEndScrollP + mStackBottomPOffset;
// Basically align the back-most task such that the last two tasks would be visible
mMinScrollP = alignToStackBottom(pAtBackMostTaskTop, 2 *
mBetweenAffiliationPOffset);
} else {
// When there is a single item, then just make all the stack progresses the same
mPreferredStackEndScrollP = mStackEndScrollP;
mMinScrollP = mStackEndScrollP;
}
} else {
// TODO: In the case where there is only freeform tasks, then the scrolls should be
// set to zero
@@ -455,7 +462,7 @@ public class TaskStackLayoutAlgorithm {
// Center the task in the stack, changing the scale will not follow the curve, but just
// modulate some values directly
float pTaskRelative = mMinScrollP - stackScroll;
float scale = SINGLE_TASK_SCALE;
float scale = (mNumFreeformTasks > 0) ? 1f : SINGLE_TASK_SCALE;
int topOffset = (mStackRect.height() - mTaskRect.height()) / 2;
transformOut.scale = scale;
transformOut.translationX = 0;