Re: Getting a GDK_CONFIGURE event from a GtkImage

2007-06-26 Thread Jim George 
On 6/26/07, Jim George [EMAIL PROTECTED] wrote:
  [...] caused an infinite loop, because I'm trying to
  do the following:
  
  gboolean solar_cal_pixbuf_resize(GtkWidget *widget, GtkAllocation
  *alloc, gpointer user_data)
  {
GtkImage *img_widget = user_data;
GdkPixbuf *pixbuf = gtk_image_get_pixbuf(img_widget);
if (pixbuf) g_object_unref(pixbuf);
pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, alloc-width,
  alloc-height);
gtk_image_set_from_pixbuf(img_widget, pixbuf);
  }
  
  The call to gtk_image_set_from_pixbuf causes a size-alloc to be
  emitted, leading to the infinite loop. I don't see why the
  size-request signal is not being emitted.
 
  Just put a call to g_signal_handlers_block_by_func() before
  gtk_Image_set_from_pixbuf(), and then after, a call to
  g_signal_handlers_unblock_by_func().  There may be a more elegant way
  of handling that, but this'll work.
 
  -brian

 Thanks, Brian, it works now.


I'll take that back, the handler keeps getting called even if I block
it before calling gtk_image_set_from_pixbuf. If I disconnect it, it
doesn't get called again. Seems like the allocate-event occurs with
some delay after gtk_image_set_from_pixbuf is called.
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Re: Getting a GDK_CONFIGURE event from a GtkImage

2007-06-26 Thread Yeti 
On Tue, Jun 26, 2007 at 11:28:48AM -0600, Jim George wrote:
 
 I'll take that back, the handler keeps getting called even if I block
 it before calling gtk_image_set_from_pixbuf. If I disconnect it, it
 doesn't get called again. Seems like the allocate-event occurs with
 some delay after gtk_image_set_from_pixbuf is called.

It does a round-trip through the X server, so the allocation
is performed after you return from the signal handler.

I do not follow this thread, but can't you just compare the
new allocation to the current one and do nothing when they
are equal?

Yeti

--
http://gwyddion.net/
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Re: Getting a GDK_CONFIGURE event from a GtkImage

2007-06-26 Thread Jim George 
 I do not follow this thread, but can't you just compare the
 new allocation to the current one and do nothing when they
 are equal?

That doesn't work, they seem to always be equal. I'm comparing the
allocation being passed to the alloc-event handler in the second
parameter and the allocation of the widget itself using something like
GTK_WIDGET(object)-allocation.width. Seems like alloc-event gets
called after the widget is allocated space, so that's the correct
behaviour.

-Jim
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Getting a GDK_CONFIGURE event from a GtkImage

2007-06-25 Thread Jim George 
Is there some way I can obtain a GDK_CONFIGURE event from a GtkImage
widget? I tried putting the GtkImage inside a GtkEventBox and
connecting a handler to configure-event, without success. I also
manually enabled GDK_STRUCTURE_MASK, even though GTK is supposed to do
that by default. I would like to know when the image size has changed,
so that I can assign a new GdkPixbuf to the GtkImage and draw to the
GdkPixbuf.

TIA

-Jim
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Re: Getting a GDK_CONFIGURE event from a GtkImage

2007-06-25 Thread Jim George 
On 6/25/07, Brian J. Tarricone [EMAIL PROTECTED] wrote:
 On Mon, 25 Jun 2007 15:13:30 -0600 Jim George wrote:

 Is there some way I can obtain a GDK_CONFIGURE event from a GtkImage
 widget? I tried putting the GtkImage inside a GtkEventBox and
 connecting a handler to configure-event, without success. I also
 manually enabled GDK_STRUCTURE_MASK, even though GTK is supposed to do
 that by default. I would like to know when the image size has changed,
 so that I can assign a new GdkPixbuf to the GtkImage and draw to the
 GdkPixbuf.

 AFAIR, configure events are only useful for toplevel windows.  You'll
 probably want to look at the size-request and/or size-allocate signals
 (on GtkWidget).

 -brian

That's true (although GtkDrawingArea will emit it too). I tried using
size-request, and nothing happened (callback never got called).
size-allocate, however, caused an infinite loop, because I'm trying to
do the following:

gboolean solar_cal_pixbuf_resize(GtkWidget *widget, GtkAllocation
*alloc, gpointer user_data)
{
  GtkImage *img_widget = user_data;
  GdkPixbuf *pixbuf = gtk_image_get_pixbuf(img_widget);
  if (pixbuf) g_object_unref(pixbuf);
  pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, alloc-width,
alloc-height);
  gtk_image_set_from_pixbuf(img_widget, pixbuf);
}

The call to gtk_image_set_from_pixbuf causes a size-alloc to be
emitted, leading to the infinite loop. I don't see why the
size-request signal is not being emitted.

Baah, maybe I should just stick to using a GtkDrawingArea instead...

-Jim
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