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Dear Sir:
I'm porting some old gtk apps to
2.0 recently.It's somehow interesting
getting into the gtk 2.0 internal code.But now I have a
problem:
An widget derived
from GtkLayout,as below
struct MyWidget
{
GtkLayout layout;
GdkPixmap
*back_pixmap; file://backing store to
avoid tingle when redraw
..
..
}
back_pixmap=
gdk_pixmap_new(widget->window,...);
MyWidget contain some child
widget,text.
in function hanle expose,first I use
gdk_pixmap_new() to create a
draw-backing buffer,and all the drawing is done
on back_pixmap
finally I invoke:
gdk_draw_pixmap(layout->bin_window,gc,back_pixmap,x,y,x,y,width,height);
to copy the drawing pixmap area to the
actual layout->bin_window(the window on screen??),
I assume that it will
display back_pixmap on screen.
If the scrollbar positon is (0,0),no
problem
But I scroll the bar, it doesn't work,some
area overlaped badly
GtkLayout in 2.0 differernt from 1.2,it remove
xoffset,yoffset,when scrolling
it just call
gdk_window_move(layout->bin_window,-hadjustment->value,-vadjustment->value);
gdk_window_process_update(layout->bin_window,TRUE);
in 1.2,it call
gdk_window_move_resize(layout->bin_window,dx,0,widget->allocation.width-dx,widget->allocation.height);
then gtk_layout_expose_area (layout,..) to send expose signal
is the difference make the thing wrong? I
wonder
Dear gtk experts,can u help me?any hints is
appreciated
Best wish
robbie
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