GTK+ Forums

Wolfgang · GTK+ Geek Joined: 05 Feb 2008 Posts: 53

Hello, everybody!

Is there any way to modify default pop-up menu of GtkTextView? In particular - to add own menu item

dreblen · Posted: Fri Aug 29, 2008 1:51 pm Post subject:

you can use the "populate-popup" signal
http://library.gnome.org/devel/gtk/stable/GtkTextView.html#GtkTextView-populate-popup
you can then use GTK's menu related functions of the GtkMenu argument
http://library.gnome.org/devel/gtk/stable/GtkMenu.html
http://library.gnome.org/devel/gtk/stable/GtkMenuItem.html
http://library.gnome.org/devel/gtk/stable/GtkMenuShell.html

here's an example:

Code: (C)

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#include <gtk/gtk.h>

void populate_popup(GtkTextView *view, GtkMenu *menu, gpointer user_data)
{
GtkWidget *m;
GtkWidget *i;

gint x;

const gchar *labels[] = {
"Some menu item number 1",
"This is a menu item too",
"this is too",
NULL,
};

i = gtk_separator_menu_item_new();
gtk_menu_shell_append(GTK_MENU_SHELL(menu), i);
gtk_widget_show(i);

i = gtk_menu_item_new_with_label("Some item");
gtk_menu_shell_append(GTK_MENU_SHELL(menu), i);
gtk_widget_show(i);

m = gtk_menu_new();
i = gtk_menu_item_new_with_label("Some menu");
gtk_menu_shell_append(GTK_MENU_SHELL(menu), i);
gtk_menu_item_set_submenu(GTK_MENU_ITEM(i), m);
gtk_widget_show(i);

for(x = 0; labels[x] != NULL; x++)
{
i = gtk_menu_item_new_with_label(labels[x]);
gtk_menu_shell_append(GTK_MENU_SHELL(m), i);
gtk_widget_show(i);
}
}

int main(int argc, char **argv)
{
GtkWidget *win;
GtkWidget *swin;
GtkWidget *view;

gtk_init(&argc, &argv);

win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
g_signal_connect(G_OBJECT(win), "delete-event", G_CALLBACK(gtk_main_quit), NULL);

swin = gtk_scrolled_window_new(NULL, NULL);
gtk_container_add(GTK_CONTAINER(win), swin);
gtk_widget_show(swin);

view = gtk_text_view_new();
g_signal_connect(G_OBJECT(view), "populate-popup", G_CALLBACK(populate_popup), NULL);
gtk_container_add(GTK_CONTAINER(swin), view);
gtk_widget_show(view);

gtk_widget_show(win);

gtk_main();

return 0;
}

Wolfgang · GTK+ Geek Joined: 05 Feb 2008 Posts: 53

Thank you very much!
And how can I detect click coordinates to know over which text menu appears?

ramesh · GTK+ Guru Joined: 16 Nov 2006 Posts: 173 Location: INDIA

dreblen · Posted: Mon Sep 01, 2008 11:37 pm Post subject:

@Wolfgang - You can use gtk_text_view_get_iter_at_location and the "button-press-event" to get an iter under the cursor.
http://library.gnome.org/devel/gtk/stable/GtkTextView.html#gtk-text-view-get-iter-at-location
Here's an example:

Code: (C)

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#include <gtk/gtk.h>

gboolean button_press_cb(GtkTextView *view, GdkEventButton *ev, gchar **text)
{
GtkTextIter iter, start, end;
gint x, y;
gunichar ch;

/* only do something with RMB */
if(ev->button != 3)
return FALSE;

/* convert the event coords to buffer coords */
gtk_text_view_window_to_buffer_coords(view, GTK_TEXT_WINDOW_WIDGET, ev->x, ev->y, &x, &y);

/* get our starting iter at the new buffer coords */
gtk_text_view_get_iter_at_location(view, &iter, x, y);
/* get the character at the current location */
ch = gtk_text_iter_get_char(&iter);
/* if it's whitespace, then nothing is active */
if(ch == ' ' || ch == '\t' || ch == '\n')
{
*text = NULL;
return FALSE;
}

do
{
/* if we're at the beginning of the buffer, stop */
if(gtk_text_iter_backward_char(&iter) == FALSE)
break;
ch = gtk_text_iter_get_char(&iter);
} while(ch != ' ' && ch != '\t' && ch != '\n');

/* make sure that we have a non-whitespace char */
if(ch == ' ' || ch == '\t' || ch == '\n')
gtk_text_iter_forward_char(&iter);
/* set our start iter */
start = iter;

do
{
/* if we're at the end of the buffer, stop */
if(gtk_text_iter_forward_char(&iter) == FALSE)
break;
ch = gtk_text_iter_get_char(&iter);
} while(ch != ' ' && ch != '\t' && ch != '\n');

end = iter;

/* set *text to the text between start and end */
*text = gtk_text_buffer_get_text(gtk_text_view_get_buffer(view), &start, &end, FALSE);

return FALSE;
}

void populate_popup_cb(GtkTextView *view, GtkMenu *menu, gchar **text)
{
GtkWidget *i;
gchar *s;

/* put a separator in front of our item */
i = gtk_separator_menu_item_new();
gtk_menu_shell_append(GTK_MENU_SHELL(menu), i);
gtk_widget_show(i);

/* this will turn out to be:
* if *text == NULL - "Do something with: <No active text>"
* else - "Do something with: '$*text'"
*/
s = g_strdup_printf("Do something with: %s", (*text == NULL ? "<No active text>" : g_strdup_printf("'%s'", *text)));
i = gtk_menu_item_new_with_label(s);
gtk_menu_shell_append(GTK_MENU_SHELL(menu), i);
gtk_widget_show(i);
}

int main(int argc, char **argv)
{
GtkWidget *win;
GtkWidget *swin;
GtkWidget *view;
gchar *text = NULL;

gtk_init(&argc, &argv);

win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
g_signal_connect(G_OBJECT(win), "delete-event", G_CALLBACK(gtk_main_quit), NULL);
gtk_container_set_border_width(GTK_CONTAINER(win), 10);

swin = gtk_scrolled_window_new(NULL, NULL);
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(swin), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
gtk_container_add(GTK_CONTAINER(win), swin);
gtk_widget_show(swin);

view = gtk_text_view_new();
g_signal_connect(G_OBJECT(view), "button-press-event", G_CALLBACK(button_press_cb), (gpointer)&text);
g_signal_connect(G_OBJECT(view), "populate-popup", G_CALLBACK(populate_popup_cb), (gpointer)&text);
gtk_container_add(GTK_CONTAINER(swin), view);
gtk_widget_show(view);

gtk_widget_show(win);

gtk_main();

return 0;
}

dreblen · Posted: Mon Sep 01, 2008 11:52 pm Post subject:

@ramesh - You might be able to get creative with the "button-release-event",
http://library.gnome.org/devel/gtk/stable/GtkWidget.html#GtkWidget-button-release-event
I did a quick mockup of using the button-release-event, it's not perfect (e.g. if you release the mouse over an insensitive item
it won't popdown like it's supposed to), but you might be able to expand it

Code: (C)

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#include <gtk/gtk.h>

void populate_popup_cb(GtkWidget *wi, GtkMenu *menu, gpointer user_data)
{
g_signal_connect_after(G_OBJECT(menu), "button-release-event", G_CALLBACK(gtk_menu_popdown), NULL);
}

int main(int argc, char **argv)
{
GtkWidget *win;
GtkWidget *swin;
GtkWidget *view;

gtk_init(&argc, &argv);

win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
g_signal_connect(G_OBJECT(win), "delete-event", G_CALLBACK(gtk_main_quit), NULL);
gtk_container_set_border_width(GTK_CONTAINER(win), 10);

swin = gtk_scrolled_window_new(NULL, NULL);
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(swin), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
gtk_container_add(GTK_CONTAINER(win), swin);
gtk_widget_show(swin);

view = gtk_text_view_new();
g_signal_connect(G_OBJECT(view), "populate-popup", G_CALLBACK(populate_popup_cb), NULL);
gtk_container_add(GTK_CONTAINER(swin), view);
gtk_widget_show(view);

gtk_widget_show(win);

gtk_main();

return 0;
}

ramesh · GTK+ Guru Joined: 16 Nov 2006 Posts: 173 Location: INDIA

Wolfgang · GTK+ Geek Joined: 05 Feb 2008 Posts: 53

Ok, I can handle button-press-event to know over which text menu appears, but what can I do in case with context-menu button on keyboard? And how can I detect reason of context menu appearance (keyboard/mouse)?