Murray Cumming wrote:
I found the problem, why Gdk::Window in GTKMM-2.4 is not compatible now
with GdkWindow in GTK+-2.4.
What do you mean? Exactly what problem are you encountering?
Example for custom cellrenderer:
CustomCellRenderer : public Gtk::CellRenderer
{
...
protected:
virtual void get_size_vfunc(...) const;virtual void render_vfunc (
const Glib::RefPtr<Gdk::Drawable>& window, // render function accepts GdkDrawable* as argument in GTK+
Gtk::Widget& widget,
const Gdk::Rectangle& background_area,
const Gdk::Rectangle& cell_area,
const Gdk::Rectangle& expose_area,
Gtk::CellRendererState flags);
...
};
---------------------------
...
// method to draw simple text cell in tree view (removed extra Pango attributes to speed up rendering)
virtual void CustomCellRenderer::render_vfunc(
const Glib::RefPtr<Gdk::Drawable>& window, // render function accepts GdkDrawable* as argument in GTK+
Gtk::Widget& widget,
const Gdk::Rectangle& background_area,
const Gdk::Rectangle& cell_area,
const Gdk::Rectangle& expose_area,
Gtk::CellRendererState flags)
{
// get text value
...
Glib::RefPtr<Pango::Layout> ptrLayout = widget.create_pango_layout (text);
// get cell dimension
...
// draw the text. Function was taken from cellrenderertext.c
widget.get_style ()->paint_layout (
/*
GTKMM declaring paint_layout fucntion that take Glib::RefPtr<Gdk::Window> as parameter, but we cannot cast Gdk::Drawable to Gdk::Window, because Gdk::Drawable is base of Gdk::Window (see Glib::RefPtr casting rules). In this case problem could be fixed by replacing Gtk::Style::paint_layout() Glib::RefPtr<Gdk::Window> parameter with Glib::RefPtr<Gdk::Drawable>.
Also, If you look at GTK+ code, you will find that almost all functions are taking GdkWindow (equal to GdkDrawable) as argument. And that may cause potential problems for developers in GTKMM.
*/ window, // COMPILATION ERROR !!!
state,
true,
cell_area,
widget,
"cellrenderertext",
cell_area.get_x () + x_offset + cell_xpad,
cell_area.get_y () + y_offset + cell_ypad,
ptrLayout );
}
Regards, -andrew
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