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Code Issues Packages Projects Releases Wiki Activity

Enable accessibility of Clear All button.

Browse Source 
The button appears in the accessibility hierarchy
as a child of RecentsView.

This makes both Talkback and Switch access
to work with it normally.

Bug: 80156299
Test: Manual

Change-Id: Ife2044b2ef78fb27b32f2d33fb17744662a2b054
This commit is contained in:
Vadim Tryshev
2018-05-24 14:21:05 -07:00
parent a845e1500c
commit a3e48d8035
3 changed files with 51 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
quickstep/src/com/android/quickstep/views/ClearAllButton.java
View File

@@ -16,13 +16,11 @@
package com.android.quickstep.views;
import static android.view.accessibility.AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS;
import android.content.Context;
import android.graphics.Rect;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.Button;
public class ClearAllButton extends Button {
@@ -37,12 +35,9 @@ public class ClearAllButton extends Button {
}
@Override
public boolean performAccessibilityAction(int action, Bundle arguments) {
final boolean res = super.performAccessibilityAction(action, arguments);
if (action == ACTION_ACCESSIBILITY_FOCUS) {
mRecentsView.revealClearAllButton();
}
return res;
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(info);
info.setParent(mRecentsView); // Pretend we are a part of the task carousel.
}
@Override

44
quickstep/src/com/android/quickstep/views/RecentsView.java
View File

@@ -39,6 +39,7 @@ import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.UserHandle;
import android.support.annotation.Nullable;
@@ -386,7 +387,13 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
private void updateClearAllButtonAlpha() {
if (mClearAllButton != null) {
final float alpha = calculateClearAllButtonAlpha();
mIsClearAllButtonFullyRevealed = alpha == 1;
final boolean revealed = alpha == 1;
if (mIsClearAllButtonFullyRevealed != revealed) {
mIsClearAllButtonFullyRevealed = revealed;
mClearAllButton.setImportantForAccessibility(revealed ?
IMPORTANT_FOR_ACCESSIBILITY_YES :
IMPORTANT_FOR_ACCESSIBILITY_NO);
}
mClearAllButton.setAlpha(alpha * mContentAlpha);
}
}
@@ -1284,8 +1291,31 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
scrollTo(mIsRtl ? 0 : computeMaxScrollX(), 0);
}
@Override
public boolean performAccessibilityAction(int action, Bundle arguments) {
if (getChildCount() > 0) {
switch (action) {
case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
if (!mIsClearAllButtonFullyRevealed && getCurrentPage() == getPageCount() - 1) {
revealClearAllButton();
return true;
}
}
case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
if (mIsClearAllButtonFullyRevealed) {
setCurrentPage(getChildCount() - 1);
return true;
}
}
break;
}
}
return super.performAccessibilityAction(action, arguments);
}
@Override
public void addChildrenForAccessibility(ArrayList<View> outChildren) {
outChildren.add(mClearAllButton);
for (int i = getChildCount() - 1; i >= 0; --i) {
outChildren.add(getChildAt(i));
}
@@ -1295,6 +1325,13 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(info);
if (getChildCount() > 0) {
info.addAction(mIsClearAllButtonFullyRevealed ?
AccessibilityNodeInfo.ACTION_SCROLL_FORWARD :
AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
info.setScrollable(true);
}
final AccessibilityNodeInfo.CollectionInfo
collectionInfo = AccessibilityNodeInfo.CollectionInfo.obtain(
1, getChildCount(), false,
@@ -1306,7 +1343,10 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
event.setScrollable(getPageCount() > 0);
if (!mIsClearAllButtonFullyRevealed
&& event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
final int childCount = getChildCount();
final int[] visibleTasks = getVisibleChildrenRange();
event.setFromIndex(childCount - visibleTasks[1] - 1);

5
quickstep/src/com/android/quickstep/views/RecentsViewContainer.java
View File

@@ -124,4 +124,9 @@ public class RecentsViewContainer extends InsettableFrameLayout {
return mRecentsView.requestFocus(direction, previouslyFocusedRect) ||
super.requestFocus(direction, previouslyFocusedRect);
}
@Override
public void addChildrenForAccessibility(ArrayList<View> outChildren) {
outChildren.add(mRecentsView);
}
}