protected virtual void ShowDropDown()
{
if (HasChildren)
{
PopupMenu = new Gtk.Menu();
PopupMenu.Hidden += (s, o) =>
HideDropDown();
PopupMenu.SelectionDone += (s, e) => {
var i = 0;
};
Populate(PopupMenu);
PopupMenu.ShowAll();
PopupMenu.Popup(null, null, delegate(Gtk.Menu menu, out int x, out int y, out bool push_in) {
var all = ContentWidget.Allocation;
var loc = GtkBackendHelper.ConvertToScreenCoordinates(ContentWidget, new Xwt.Point(0, all.Height));
x = (int)loc.X;
y = (int)loc.Y;
push_in = true;
}, 0,
Gtk.Global.CurrentEventTime);
PopupMenu.WidthRequest = this.Widget.Allocation.Width;
}
}
public void SetChild(Vidget value)
{
var child = value.Backend.ToGtk();
if (child != null)
{
if (Widget.Child != child)
{
if (Widget.Child != null)
{
Widget.Remove(Widget.Child);
}
child.Show();
Widget.Child = GtkBackendHelper.EventsRootWidget(child);
}
}
}
public static PopupWindow Show(Widget reference, Xwt.Rectangle positionRect, Widget child)
{
var popup = new PopupWindow(child);
var topLevel = (Window)reference.Toplevel;
popup.DestroyWithParent = true;
popup.BorderWidth = topLevel.BorderWidth;
// bounds of reference widget in screen coordinates
var referenceBounds = Xwt.Rectangle.Zero;
// position of popup
Func <Xwt.Point> calcPosition = () => {
referenceBounds = new Xwt.Rectangle(
GtkBackendHelper.ConvertToScreenCoordinates(reference, Xwt.Point.Zero),
new Xwt.Size(reference.Allocation.Width, reference.Allocation.Height));
if (positionRect == Xwt.Rectangle.Zero)
{
positionRect = new Xwt.Rectangle(Xwt.Point.Zero, referenceBounds.Size);
}
positionRect = positionRect.Offset(referenceBounds.Location);
return(new Xwt.Point(positionRect.X, positionRect.Bottom));
};
var popupPosition = calcPosition();
if (child == null)
{
popup.SetSizeRequest((int)referenceBounds.Width, (int)referenceBounds.Height);
}
else
{
popup.DefaultWidth = 10;
child.ShowAll();
}
var topLevelPos = GtkBackendHelper.ConvertToScreenCoordinates(topLevel, Xwt.Point.Zero);
popup.TransientPosition = popupPosition.Offset(-topLevelPos.X, -topLevelPos.Y);
Gtk.SizeAllocatedHandler sizeAllocated = (o, args) => {
popup.Move((int)popupPosition.X, (int)popupPosition.Y);
popup.GrabFocus();
};
popup.SizeAllocated += sizeAllocated;
topLevel.AddEvents((int)Gdk.EventMask.StructureMask);
topLevel.ConfigureEvent -= popup.TopLevelConfigureEvent;
topLevel.ConfigureEvent += popup.TopLevelConfigureEvent;
// if the mouse is moved in toplevel-window:
Gtk.MotionNotifyEventHandler topLevelMotion = (s, args) => {
if (topLevel == null)
{
return;
}
topLevelPos = GtkBackendHelper.ConvertToScreenCoordinates(topLevel, Xwt.Point.Zero);
var referencePos = GtkBackendHelper.ConvertToScreenCoordinates(reference, Xwt.Point.Zero);
// take args in sceen coordinates:
var motionPos = new Xwt.Point(args.Event.XRoot, args.Event.YRoot);//topLevelPos.Offset (args.Event.X, args.Event.Y);
var tolerance = popup.Tolerance;
var popupSize = new Xwt.Size(popup.Allocation.Width, popup.Allocation.Height);
// var refBounds = new Xwt.Rectangle (refPos, screenBounds.Size);
var motionBounds = new Xwt.Rectangle(
referencePos.X - tolerance.Left,
referencePos.Y - tolerance.Top,
popupSize.Width + tolerance.HorizontalSpacing,
popupSize.Height + tolerance.VerticalSpacing);
// TODO: hide if other event than move-event occurs outside of popup window
// TODO: something is wrong with referencepos; maybe ConvertToScreenCoordinates has an error
if (!motionBounds.Contains(motionPos))
{
popup.HideAll();
}
};
topLevel.MotionNotifyEvent += topLevelMotion;
//ClientEvent: a message has been received from another application.
popup.ShowAll();
popup.Hidden += (o, args) => {
topLevel.ConfigureEvent -= popup.TopLevelConfigureEvent;
topLevel.MotionNotifyEvent -= topLevelMotion;
popup.ReleaseInnerWidget();
popup.Destroy();
};
return(popup);
}
