I am trying to create a custom GTK Widget by subclassing Gtk.Bin. I am not using the Stetic GUI builder. This widget will contain several standard Gtk widgets (VBoxs, Labels, Buttons, etc).
public class MyWidget : Gtk.Bin
{
public MyWidget : base ()
{
build ();
}
private void build ()
{
VBox vbox1 = new Vbox (true, 0);
vbox1.PackStart (new Label ("MyWidget"), true, true, 0);
this.Add (vbox1);
}
}
Meanwhile when I add my custom widget to the main window, I don't see anything. The windows other controls show up, space is allocated for this custom widget. I expect to see the label "MyWidget" in its space, but nothing shows up. I step thru the code in the debugger and it all gets called but its a no show at runtime.
Any help would be appreciated.
need to override:
protected override void OnSizeAllocated (Gdk.Rectangle allocation)
{
if (this.Child != null)
{
this.Child.Allocation = allocation;
}
}
protected override void OnSizeRequested (ref Requisition requisition)
{
if (this.Child != null)
{
requisition = this.Child.SizeRequest ();
}
}
或者更有可能的是,ShowAll()是所有子项被打包后构建方法中的最后一行,除非您不希望默认情况下其中一些是可见的。
Gtk+ controls are (frustratingly) not visible by default.
Try calling .Show () on your Label.
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