Hi,
I have a problem with an self created widget, based on Gtk::DrawingArea.
It was introduced with a change to version 3.14.1 (debian version is
3.14.1-1; ruby-gtk shows as Gtk::VERSION [3, 14, 1]).
If I place the drawing area in box (vertical) below an other widget, all
drawing with cairo is clipped on the bottom side of the drawing area, as
much as the widgets above the area are tall.
Here is a simple ruby-gtk example that shows this behavior.
#!/usr/bin/env ruby
require 'gtk3'
win = Gtk::Window.new
win.set_default_size 400, 400
box = Gtk::Box.new :vertical
win.add box
button = Gtk::Button.new :label => 'click me'
box.pack_start button, :expand => false, :fill => false
area = Gtk::DrawingArea.new
box.pack_start area, :expand => true, :fill => true
button.signal_connect(:clicked) do
cc = area.window.create_cairo_context
# cc.reset_clip
cc.set_source_rgb 1, 1, 1
cc.paint
cc.set_source_rgb 0, 0, 0
allo = area.allocation
cc.rectangle 10, 10, allo.width - 20, allo.height - 20
cc.stroke
end
win.show_all
Gtk.main
If I uncomment the line 18 to reset the clipping of the cairo context,
The drawing fills as expected the complete drawing area. So my
assumption is, that gtk creates a default clip region, that is in this
case wrong. Or is this behavior expected, and if so, what is the
preferred way to handle it?
Cheers, detlef
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