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Code Issues Packages Projects Releases Wiki Activity

New calculation for clear-all alpha.

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Per UX feedback, alpha changes from the central position of the last
task and its overscrolled position. Button location is not used.

Bug: 72222505
Test: Manual
Change-Id: Ifc22c935940eaeb1b1ec6e4a5f2709ac7ae8253b
This commit is contained in:
Vadim Tryshev
2018-05-02 13:14:16 -07:00
parent cacf90cc48
commit 80cd825c0f
1 changed files with 12 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
quickstep/src/com/android/quickstep/views/RecentsView.java
View File

@@ -41,7 +41,6 @@ import android.text.TextPaint;
import android.util.ArraySet;
import android.util.AttributeSet;
import android.util.FloatProperty;
import android.util.Log;
import android.util.SparseBooleanArray;
import android.view.KeyEvent;
import android.view.LayoutInflater;
@@ -315,52 +314,25 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
final int childCount = getChildCount();
if (mShowEmptyMessage || childCount == 0) return 0;
// Current visible coordinate of the end of the oldest task.
final View lastChild = getChildAt(childCount - 1);
// Current visible coordinate of the end of the oldest task.
final int carouselCurrentEnd =
(mIsRtl ? lastChild.getLeft() : lastChild.getRight()) - getScrollX();
// As the end (let's call it E aka carouselCurrentEnd) of the carousel moves over Clear
// all button, the button changes trasparency.
// fullAlphaX and zeroAlphaX are the points of the 100% and 0% alpha correspondingly.
// Alpha changes linearly between 100% and 0% as E moves through this range. It doesn't
// change outside of the range.
// Visible button-facing end of a centered task.
final int centeredTaskEnd = mIsRtl ?
getPaddingLeft() + mInsets.left :
getWidth() - getPaddingRight() - mInsets.right;
// Once E hits the border of the Clear-All button that looks towards the most recent
// task, the whole button is uncovered, and it should have alpha 100%.
final float fullAlphaX = mIsRtl ?
mClearAllButton.getX() + mClearAllButton.getWidth() :
mClearAllButton.getX();
// X coordinate of the carousel scrolled as far as possible in the direction towards the
// button. Logically, the button is "behind" the least recent task. This is the
// coordinate of the end of the least recent task in the carousel just after opening,
// with the most recent task in the center, and the rest of tasks go from that point
// towards and potentially behind the button.
final int carouselMotionLimit = getScrollForPage(childCount - 1) - getScrollForPage(0) +
(mIsRtl ?
getPaddingLeft() + mInsets.left :
getWidth() - getPaddingRight() - mInsets.right);
// The carousel might not be able to ever cover a part of the Clear-all button. Then
// always show the button as 100%. Technically, this check also prevents dividing by zero
// or getting a negative transparency ratio.
if (mIsRtl ? carouselMotionLimit >= fullAlphaX : carouselMotionLimit <= fullAlphaX) {
return 1;
}
// If the carousel is able to cover the button completely, we make the button completely
// transparent when E hits the border of the button farthest from the most recent task.
// Or, the carousel may not be able to move that far towards the button so it completely
// covers the it. Then we set the motion limit position of the carousel as the point
// where the button reaches 0 alpha.
final float zeroAlphaX = mIsRtl ?
Math.max(mClearAllButton.getX(), carouselMotionLimit) :
Math.min(mClearAllButton.getX() + mClearAllButton.getWidth(), carouselMotionLimit);
// The distance of the carousel travel during which the alpha changes from 0 to 1. This
// is the motion between the oldest task in its centered position and the oldest task
// scrolled to the end.
final int alphaChangeRange = (mIsRtl ? 0 : mMaxScrollX) - getScrollForPage(childCount - 1);
return Utilities.boundToRange(
(zeroAlphaX - carouselCurrentEnd) /
(zeroAlphaX - fullAlphaX), 0, 1);
((float) (centeredTaskEnd - carouselCurrentEnd)) /
alphaChangeRange, 0, 1);
}
private void updateClearAllButtonAlpha() {