Hi list,
I'm learning GTK+ using "Foundations of GTK+ Development" by Andrew
Krause and today I did the exercise2-1(chapter2) which should meet the
demand as follows:
when press the key,the label's text and window's title can interchange.
However,I got the warning:"Invalid UTF-8 string passed to
pango_layout_set_text()".
The label's text will be messy character when I first press SHIFT and
both become messy when I press key at the second time.
The code is as follows and please note my comments:
#include<gtk/gtk.h>
#include<gdk/gdkkeysyms.h>
static gboolean changeTitle(GtkWidget* window,
GdkEventKey* keyEvent,
GtkLabel *label)
{
const gchar *textLabel=gtk_label_get_text(GTK_LABEL(label));
const gchar
*textWindow=gtk_window_get_title(GTK_WINDOW(window));
if(keyEvent->keyval==GDK_Shift_L)
{
//surprise,if I skip(via "//") one of the two lines,
another
//will work fine.....
gtk_window_set_title(GTK_WINDOW(window),textLabel);
gtk_label_set_text(GTK_LABEL(label),textWindow);
}
return FALSE;
}
int main(int argc,char *argv[])
{
GtkWidget *main_window;
GtkWidget *selec_label;
gtk_init(&argc,&argv);
main_window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(main_window),"Qiuxyu");
gtk_widget_set_size_request(GTK_WIDGET(main_window),200,100);
gtk_window_set_resizable(GTK_WINDOW(main_window),FALSE);
g_signal_connect(G_OBJECT(main_window),"destroy",G_CALLBACK
(gtk_main_quit),NULL);
selec_label=gtk_label_new("Randy");
gtk_label_set_selectable(GTK_LABEL(selec_label),TRUE);
g_signal_connect(G_OBJECT(main_window),"key_press_event",
G_CALLBACK(changeTitle),(gpointer)selec_label);
gtk_container_add(GTK_CONTAINER(main_window),selec_label);
gtk_widget_show_all(main_window);
gtk_main();
return 0;
}
Thanks for any clue!
Best regards,
Randy
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