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Adjust event location when two-finger dragging in TouchExplorer

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To scroll on the screen when using TalkBack, a user need to dragging two
finger pointers. If the dragging pointer are closer that a given distance
we use the location of the primary one. Otherwise, we should adjust the
event location to take the middle between the two finger pointers.

Bug: 126354276
Test: atest TouchExplorerTest
Change-Id: I9e95ccec964d7930498febdd02731b94826fbb7b
This commit is contained in:
mincheli
2019-04-24 18:10:28 +08:00
parent c37d832194
commit b7507a9997
1 changed files with 8 additions and 3 deletions
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11
services/accessibility/java/com/android/server/accessibility/TouchExplorer.java
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@@ -703,12 +703,17 @@ class TouchExplorer extends BaseEventStreamTransformation
final float secondPtrX = event.getX(1);
final float secondPtrY = event.getY(1);
final float deltaX = firstPtrX - secondPtrX;
final float deltaY = firstPtrY - secondPtrY;
final int pointerIndex = event.findPointerIndex(mDraggingPointerId);
final float deltaX =
(pointerIndex == 0) ? (secondPtrX - firstPtrX)
: (firstPtrX - secondPtrX);
final float deltaY =
(pointerIndex == 0) ? (secondPtrY - firstPtrY)
: (firstPtrY - secondPtrY);
final double distance = Math.hypot(deltaX, deltaY);
if (distance > mScaledMinPointerDistanceToUseMiddleLocation) {
event.setLocation(deltaX / 2, deltaY / 2);
event.offsetLocation(deltaX / 2, deltaY / 2);
}
// If still dragging send a drag event.