Le mer 22/12/2004 Ã 16:22, Roger Leigh a Ãcrit : > [I originally posted this to gtk-app-devel-list, but I'm not sure that's > the best place.] > > Is the Canvas on-topic for this list? If so, I have a few basic > questions about it, which I hope are simple :) > > Firstly, which Canvas implementation should I be using? I've tried > libgnomecanvas2, but I see there's also a FooCanvas, and a GtkCanvas > (GTK+ 1.2 only?). Is the AA canvas still experimental and not > recommended? I don't think there is still some development on the Gnome Canvas but it seems there are some projects to rewrite it using Cairo. Nonetheless, I have used the AA canvas in GCHemPaint for a while with only some minor problems, essentially with the rich text item. > I've been looking at George Lebl's "Piskvorky" canvas tutorial. > (ftp://ftp.5z.com/pub/unix/gnome-piskvorky-1.tar.gz) After > tweaking the Makefile to use pkg-config, this built fine with > GTK+ 2.4/GNOME 2.8. However, I did find a problem: if I resize the > window, the canvas viewable area becomes centred in the canvas widget, > but the coordinates of button presses are still relative to the top left > corner of the canvas widget, rather than the canvas view itself. How > should I compensate for this in the code? Or is this a canvas bug, > since the events are outside the drawable area? > > What I really want to do with the canvas is create a grid display > system, similar to Gnumeric, but probably much simpler. What I want to > do is achieve the same scroll behaviour as Gnumeric: the row and column > labels scroll with the canvas, and scrolling is in discrete steps. How > should I do this. I thought of two possible methods: > - packing four canvas widgets into viewports in a GtkTable and tying > their adjustments to the same scrollbars. > - overlaying the row/column headings on top of the canvas relative > to the scroll position. > How does Gnumeric do this? I had a look, but couldn't find the > relevant source files. Have a look at gnumeric-pane.c. I'm not quite sure it's the right file. Jody should be able to tell you more about that when he'll be back from sunny countries. Regards, Jean _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
