public static Point GetOverlayAnchorPosition(AccessibilityNodeInfo anchorNode, AccessibilityNodeInfo root,
IEnumerable <AccessibilityWindowInfo> windows)
{
Point point = null;
if (anchorNode != null)
{
// Update node's info since this is still a reference from an older event
anchorNode.Refresh();
if (!anchorNode.VisibleToUser)
{
return(new Point(-1, -1));
}
if (!anchorNode.Focused)
{
return(null);
}
// node.VisibleToUser doesn't always give us exactly what we want, so attempt to tighten up the range
// of visibility
var rootNodeHeight = GetNodeHeight(root);
var limitLowY = 0;
var limitHighY = rootNodeHeight - GetNodeHeight(anchorNode);
if (windows != null)
{
if (IsStatusBarExpanded(windows))
{
return(new Point(-1, -1));
}
var inputWindowRect = GetInputMethodWindowRect(windows);
if (inputWindowRect != null)
{
limitLowY += inputWindowRect.Height();
if (Build.VERSION.SdkInt >= BuildVersionCodes.Q)
{
limitLowY += GetNavigationBarHeight() + GetStatusBarHeight();
}
inputWindowRect.Dispose();
}
}
point = GetOverlayAnchorPosition(root, anchorNode, rootNodeHeight);
if (point.Y < limitLowY || point.Y > limitHighY)
{
point.X = -1;
point.Y = -1;
}
}
return(point);
}
public static Point GetOverlayAnchorPosition(AccessibilityService service, AccessibilityNodeInfo anchorNode,
AccessibilityNodeInfo root, IEnumerable <AccessibilityWindowInfo> windows, int overlayViewHeight,
bool isOverlayAboveAnchor)
{
Point point = null;
if (anchorNode != null)
{
// Update node's info since this is still a reference from an older event
anchorNode.Refresh();
if (!anchorNode.VisibleToUser)
{
return(new Point(-1, -1));
}
if (!anchorNode.Focused)
{
return(null);
}
// node.VisibleToUser doesn't always give us exactly what we want, so attempt to tighten up the range
// of visibility
var inputMethodHeight = 0;
if (windows != null)
{
if (IsStatusBarExpanded(windows))
{
return(new Point(-1, -1));
}
inputMethodHeight = GetInputMethodHeight(windows);
}
var minY = 0;
var rootNodeHeight = GetNodeHeight(root);
if (rootNodeHeight == -1)
{
return(null);
}
var maxY = rootNodeHeight - GetNavigationBarHeight(service) - GetStatusBarHeight(service) -
inputMethodHeight;
point = GetOverlayAnchorPosition(service, anchorNode, overlayViewHeight, isOverlayAboveAnchor);
if (point.Y < minY)
{
if (isOverlayAboveAnchor)
{
// view nearing bounds, anchor to bottom
point.X = -1;
point.Y = 0;
}
else
{
// view out of bounds, hide overlay
point.X = -1;
point.Y = -1;
}
}
else if (point.Y > (maxY - overlayViewHeight))
{
if (isOverlayAboveAnchor)
{
// view out of bounds, hide overlay
point.X = -1;
point.Y = -1;
}
else
{
// view nearing bounds, anchor to top
point.X = 0;
point.Y = -1;
}
}
else if (isOverlayAboveAnchor && point.Y < (maxY - (overlayViewHeight * 2) - GetNodeHeight(anchorNode)))
{
// This else block forces the overlay to return to bottom alignment as soon as space is available
// below the anchor view. Removing this will change the behavior to wait until there isn't enough
// space above the anchor view before returning to bottom alignment.
point.X = -1;
point.Y = 0;
}
}
return(point);
}