gtk_clipboard_set_with_data

["Evan Stade" <estade gmail com>]

Hi,

I am trying to use the gtk clipboard. I want to be able to set the
data on the clipboard twice in a row. I have run into some unexpected
behavior, however. Here is an example program:

#include <gtk/gtk.h>
#include <stdio.h>
#include <string.h>

void GetNoOp(GtkClipboard* clipboard,
            GtkSelectionData* selection_data,
            guint info,
            gpointer user_data) {
}

void ClearNoOp(GtkClipboard* clipboard,
              gpointer user_data) {
}

void PrintTargets() {
 GdkAtom* targets;
 int num_targets = 0;
 GtkClipboard* clip = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);

 gtk_clipboard_wait_for_targets(clip, &targets, &num_targets);

 printf("\nAvailable targets:\n---------------\n");

 for(size_t i = 0; i < num_targets; i++){
   printf("  [%s]", gdk_atom_name(targets[i]));
 }

 printf("\n");
}

int main(int argc, char* argv[]){
 char* data = new char[2];
 gtk_init(&argc, &argv);
 GtkClipboard* clipboard = gtk_clipboard_get(GDK_SELECTION_CLIPBOARD);

 GtkTargetEntry targets1[] = {{"TEXT", 0, 0}};
 GtkTargetEntry targets2[] = {{"TEXT", 0, 0}, {"IMAGE", 0, 0}};

 gtk_clipboard_set_with_data(clipboard, targets1, 1, GetNoOp, ClearNoOp, data);
 PrintTargets();

 // the output is the same if you uncomment the following
 // gtk_clipboard_clear(clipboard);

 gtk_clipboard_set_with_data(clipboard, targets2, 2, GetNoOp, ClearNoOp, data);
 PrintTargets();
}


The output is

Available targets:
---------------
 [TIMESTAMP]  [TARGETS]  [MULTIPLE]  [TEXT]

Available targets:
---------------
 [TIMESTAMP]  [TARGETS]  [MULTIPLE]  [TEXT]


whereas I would have hoped it would be something like


Available targets:
---------------
 [TIMESTAMP]  [TARGETS]  [MULTIPLE]  [TEXT]

Available targets:
---------------
 [TIMESTAMP]  [TARGETS]  [MULTIPLE]  [TEXT]  [IMAGE]


Does anyone have any insight why this might be happening? Note that in
my actual program I do set data and I still have this hiccup. And if
you reverse the order of the set_with_data calls, then you get the
following as output:


Available targets:
---------------
 [TIMESTAMP]  [TARGETS]  [MULTIPLE]  [TEXT]  [IMAGE]


Available targets:
---------------
 [TIMESTAMP]  [TARGETS]  [MULTIPLE]  [TEXT]  [IMAGE]


Thanks.

---------------
Evan Stade