public void OnTransitionStart(Android.Transitions.Transition transition)
{
_startingType = _container.LayerType;
if (_startingType != LayerType.Hardware && !_container.IsDisposed())
{
_container.SetLayerType(LayerType.Hardware, null);
}
}
public static void Focus(this AView platformView, FocusRequest request)
{
request.IsFocused = true;
// Android does the actual focus/unfocus work on the main looper
// So in case we're setting the focus in response to another control's un-focusing,
// we need to post the handling of it to the main looper so that it happens _after_ all the other focus
// work is done; otherwise, a call to ClearFocus on another control will kill the focus we set
var q = Looper.MyLooper();
if (q != null)
{
new Handler(q).Post(RequestFocus);
}
else
{
MainThread.InvokeOnMainThreadAsync(RequestFocus);
}
void RequestFocus()
{
if (platformView == null || platformView.IsDisposed())
{
return;
}
platformView?.RequestFocus();
}
}
public static void SetClipToOutline(this AView view, bool value)
{
if (view.IsDisposed() || !Forms.IsLollipopOrNewer)
{
return;
}
view.ClipToOutline = value;
}
public static bool GetClipToOutline(this AView view)
{
if (view.IsDisposed() || !Forms.IsLollipopOrNewer)
{
return(false);
}
return(view.ClipToOutline);
}
public static bool SetElevation(this AView view, float value)
{
if (view.IsDisposed() || !Forms.IsLollipopOrNewer)
{
return(false);
}
view.Elevation = value;
return(true);
}
public static void EnsureId(this AView view)
{
if (view.IsDisposed())
{
return;
}
if (view.Id == AView.NoId)
{
view.Id = AppCompat.Platform.GenerateViewId();
}
}
public static void SetClipToOutline(this AView view, bool value, VisualElement element)
{
if (view.IsDisposed())
{
return;
}
var shouldClip = value;
if (element is Frame frame)
{
shouldClip = frame.IsSet(Layout.IsClippedToBoundsProperty)
? frame.IsClippedToBounds : frame.CornerRadius > 0f;
}
if (view is FastRenderers.FrameRenderer && System.Maui.Maui.IsLollipopOrNewer)
{
view.SetClipToOutline(shouldClip);
return;
}
// setClipBounds is only available in API 18 +
if ((int)Build.VERSION.SdkInt >= 18)
{
if (!(view is ViewGroup viewGroup))
{
return;
}
// Forms layouts should not impose clipping on their children
viewGroup.SetClipChildren(false);
// But if IsClippedToBounds is true, they _should_ enforce clipping at their own edges
viewGroup.ClipBounds = shouldClip ? new Rect(0, 0, viewGroup.Width, viewGroup.Height) : null;
}
else
{
// For everything in 17 and below, use the setClipChildren method
if (!(view.Parent is ViewGroup parent))
{
return;
}
if ((int)Build.VERSION.SdkInt >= 18 && parent.ClipChildren == shouldClip)
{
return;
}
parent.SetClipChildren(shouldClip);
parent.Invalidate();
}
}
public static void Focus(this AView platformView, FocusRequest request)
{
// Android does the actual focus/unfocus work on the main looper
// So in case we're setting the focus in response to another control's un-focusing,
// we need to post the handling of it to the main looper so that it happens _after_ all the other focus
// work is done; otherwise, a call to ClearFocus on another control will kill the focus we set here
MainThread.BeginInvokeOnMainThread(() =>
{
if (platformView == null || platformView.IsDisposed())
{
return;
}
platformView?.RequestFocus();
});
}
public static void EnsureLongClickCancellation(this AView view, MotionEvent motionEvent, bool handled, VisualElement element)
{
if (view.IsDisposed())
{
return;
}
if (motionEvent.Action == MotionEventActions.Up && handled && view.LongClickable && element.IsInViewCell())
{
// In order for long presses/clicks (for opening context menus) to work in a ViewCell
// which contains any Clickable Views (e.g., any with TapGestures associated, or Buttons)
// the top-level container in the ViewCell has to be LongClickable; unfortunately, Android
// cancels a pending long press/click during MotionEventActions.Up, which the View won't
// get if the gesture listener has already processed it. So when all these conditions are
// true, we need to go ahead and send the Up event to the View; if we don't, the context menu will open
view.OnTouchEvent(motionEvent);
}
}
