The documentation of OffscreenWindow says: "When contained offscreen
widgets are redrawn, OffscreenWindow will emit a "damage-event"
signal."
I connected a signal handler to signal_damage_event(), like so:
m_pw.signal_damage_event().connect(
sigc::mem_fun(*this,
&Test::on_offscreen_window_damage_event));
And it worked, when I called get_pixbuf() in the signal handler!
Kjell
Den 2014-09-03 15:32, Phil Wolff skrev:
Yes,
I discovered that yesterday, but my end use for this cannot rely
on user intervention.
I derived my own OffscreenWindow class so I could trap events.
Following the show_all(), I see signal_realize, and I see
signal_map, but (contrary to the documentation: "The
signal_map_event() signal will be emitted when the widget's window
is mapped. A window is mapped when it becomes visible on the
screen.") I never see signal_map_event, which is the one that
would tell me when to call get_pixbuf().
???
Phil
On 09/03/2014 01:46 AM, Kjell Ahlstedt wrote:
Den 2014-09-02 01:23, Phil Wolff skrev:
Can anybody tell me why this code
returns a properly sized Pixbuf with no image data?
When Gtk::OffscreenWindow::get_pixbuf() is called in Test::Test,
the OffscreenWindow has not yet been drawn. Try my modified
version of your code. When it's started, the window is empty. If
you press a mouse button in the window,
Test::on_button_press_event() is called, and the label's text is
shown.
Kjell
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