GooCanvasWidget provides support for placing any GtkWidget in the canvas.
The width and height
properties specify the widget's size. If either of them is -1, then the requested size of the widget is used instead, which is the
default for both width and height.
Note that there are a number of limitations in the use of CanvasWidget:
<itemizedlist><listitem><para> It doesn't support any transformation besides simple translation. This means you can't
scale a canvas with a CanvasWidget in it. </para></listitem><listitem><para> It doesn't
support layering, so you can't place other items beneath or above the CanvasWidget. </para></listitem
><listitem><para> It doesn't support rendering of widgets to a given cairo_t, which means you can't output the widget to a
pdf or postscript file. </para></listitem><listitem><para> It doesn't have a model/view variant like the other
standard items, so it can only be used in a simple canvas without a model. </para></listitem><listitem><para> It
can't be made a static item. </para></listitem></itemizedlist>