private void ClearStateFlags()
{
using var suspender = new StateChangeSuspender(this);
IsPressed = false;
IsPointerOver = false;
_isPointerCaptured = false;
_isSpaceOrEnterKeyDown = false;
_isPointerLeftButtonDown = false;
_isNavigationAcceptOrGamepadAKeyDown = false;
}
protected override void OnPointerPressed(PointerRoutedEventArgs args)
{
if (args.Handled)
{
Cleanup();
return;
}
var pointerPoint = args.GetCurrentPoint(this);
var pointerProperties = pointerPoint.Properties;
var isLeftButtonPressed = pointerProperties.IsLeftButtonPressed;
if (isLeftButtonPressed)
{
_isPointerLeftButtonDown = true;
// Note: even if ClickMode is Press, we capture the pointer and handle the Release args, but we do nothing if Hover
// Capturing the Pointer ensures that we will be the first element to receive the pointer released event
// It will also ensure that if we scroll while pressing the button, as the capture will be lost, we won't raise Click.
if (!IsEnabled || ClickMode == ClickMode.Hover)
{
Cleanup();
return;
}
args.Handled = true;
using (var suspender = new StateChangeSuspender(this))
{
Focus(FocusState.Pointer);
CapturePointerInternal(args.Pointer);
if (_isPointerCaptured)
{
IsPressed = true;
}
}
if (ClickMode == ClickMode.Press)
{
RaiseClick(args);
}
}
Cleanup();
void Cleanup()
{
base.OnPointerPressed(args);
}
}
protected override void OnPointerExited(PointerRoutedEventArgs e)
{
IsPointerOver = false;
using (var suspender = new StateChangeSuspender(this))
{
if (ClickMode == ClickMode.Hover && IsEnabled)
{
IsPressed = false;
}
}
base.OnPointerExited(e);
}
protected override void OnPointerEntered(PointerRoutedEventArgs args)
{
IsPointerOver = true;
using (var suspender = new StateChangeSuspender(this))
{
if (ClickMode == ClickMode.Hover && IsEnabled)
{
IsPressed = true;
RaiseClick(args);
}
}
base.OnPointerEntered(args);
}
protected override void OnLostFocus(RoutedEventArgs e)
{
if (FocusState == FocusState.Unfocused)
{
using var suspender = new StateChangeSuspender(this);
if (ClickMode != ClickMode.Hover)
{
IsPressed = false;
ReleasePointerCaptureInternal(null);
}
}
base.OnLostFocus(e);
}
protected override void OnPointerCaptureLost(PointerRoutedEventArgs args)
{
base.OnPointerCaptureLost(args);
var pointer = args.Pointer;
ReleasePointerCaptureInternal(pointer);
// For touch, we can clear PointerOver when receiving PointerCaptureLost, which we get when the finger is lifted
// or from cancellation, e.g. pinch-zoom gesture in ScrollViewer.
// For mouse, we need to wait for PointerExited because the mouse may still be above the ButtonBase when
// PointerCaptureLost is received from clicking.
var pointerPoint = args.GetCurrentPoint(null);
var pointerDeviceType = pointerPoint.PointerDevice?.PointerDeviceType ?? PointerDeviceType.Touch;
if (pointerDeviceType == PointerDeviceType.Touch)
{
//IsPointerOver = false;
}
using var suspender = new StateChangeSuspender(this);
IsPressed = false;
}
