Ok, so this is really a pure Gtk issue. I know this isn't necessarily the proper mailing list, but if anyone has any clues, I'd really appreciate the help.
See below for test program to illustrate issue, just resize X-window and watch the debug output. What can I do to get the GdkWindow to update its size bounds when the underlying XWindow changes size? // Written by Ch. Tronche (http://tronche.lri.fr:8000/) // Modified by C. Nygard to illustrate gdk_window resize issue // Copyright by the author. This is unmaintained, no-warranty free software. // Please use freely. It is appreciated (but by no means mandatory) to // acknowledge the author's contribution. Thank you. // Started on Thu Jun 26 23:29:03 1997 // gcc -o test test.c `pkg-config --libs --cflags gtk+-2.0 gtk+-x11-2.0` #include <X11/Xlib.h> #include <assert.h> #include <unistd.h> #include <gdk/gdk.h> #include <gdk/gdkx.h> #define NIL (0) main(int argc, char **argv) { GdkWindow *gdk_win; gdk_init(&argc, &argv); // Open the display Display *dpy = XOpenDisplay(NIL); assert(dpy); // Get some colors int blackColor = BlackPixel(dpy, DefaultScreen(dpy)); int whiteColor = WhitePixel(dpy, DefaultScreen(dpy)); // Create the window Window w = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, 200, 100, 0, blackColor, blackColor); gdk_win = gdk_window_foreign_new((guint32)w); printf("gdk_win = %p\n", gdk_win); // We want to get MapNotify events XSelectInput(dpy, w, StructureNotifyMask); // "Map" the window (that is, make it appear on the screen) XMapWindow(dpy, w); // Create a "Graphics Context" GC gc = XCreateGC(dpy, w, 0, NIL); // Tell the GC we draw using the white color XSetForeground(dpy, gc, whiteColor); // Wait for the MapNotify event for(;;) { XEvent e; XNextEvent(dpy, &e); if (e.type == MapNotify) break; } // Draw the line XDrawLine(dpy, w, gc, 10, 60, 180, 20); // Send the "DrawLine" request to the server XFlush(dpy); gdk_win = gdk_window_foreign_new((guint32)w); printf("gdk_win = %p\n", gdk_win); // Spit out window dimensions whenever we get an event. for(;;) { XEvent e; Window root; int x, y, xret, yret; unsigned int widthret,heightret,borderwidthret,depthret; XNextEvent(dpy, &e); XGetGeometry(dpy, w, &root, &xret, &yret, &widthret, &heightret, &borderwidthret, &depthret); printf("Window dims: (%d, %d) pos: (%d, %d)\n", widthret, heightret, xret, yret); // Re-initializing gdk_win doesn't even help gdk_win = gdk_window_foreign_new((guint32)w); gdk_window_get_size(gdk_win, &x, &y); printf("GdkWindow dims: (%d, %d)\n", x, y); } // Wait for 10 seconds sleep(10); } On Sat, Mar 8, 2014 at 2:02 PM, Carl Nygard <cjnyg...@gmail.com> wrote: > Hey all, > > Hoping to get some help on an older version of Gtkmm (2.4). I'm > supporting some legacy code and as we migrate to newer versions of OS, > we're running into issues with some drawing functionality. > > To boil it down, we are creating a GdkWindow via gdk_window_foreign_new() > from a drawable window, and then wrapping that in a > Glib::RefPtr<Gdk::Drawable> via Glib::wrap(). > > void InitDrawable() { > > Window win; // local variable, assume initialized properly > Glib::RefPtr<Gdk::Drawable> drawable; > GdkWindow* w = gdk_window_foreign_new(win) > drawable = Glib::wrap(w); > > } > > The issue is that everything works fine the first time through. But if we > resize the window, the drawable->get_size() always returns whatever size > the window was when the drawable was initialized. > > I've tried a bunch of different ideas to try to get this to work: > > - gdk_window_foreign_new_for_display(dpy, win) has no effect on behavior > - drawable.reset() to free up the GdkWindow and re-initialize whenever the > Window resizes. > - XGetGeometry(dpy, win, ...) followed by drawable->resize() or > gdk_window_resize(win,...) > > Nothing seems to work. Resize() has no effect on the GdkWindow. Freeing > the drawable and then calling gdk_window_foreign_new() actually returns the > same value for the GdkWindow* every time. > > I'm hoping someone has some clues as to what I'm doing wrong. I'd be > happy with any kind of workaround just to get this functional. Suggestions > to just upgrade to latest are not helpful, as this is legacy code. > However, we are in the middle of rewriting the front end in pure Gtkmm, so > this issue will not last forever. I just need to get the previous version > stabilized for the porting period. > > --carl > >
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