| View previous topic :: View next topic |
| Author |
Message |
eldar
Joined: 14 Jun 2008
Posts: 101
Location: Ufa, Russia
|
 Posted: Sat Sep 13, 2008 1:38 pm Post subject: Calling default implementation of on_button_press_event |
 |
|
I am trying to implement Popup menu functionality for a TreeView widget. I use addOnButtonPress() to add an event handler for an mouse button press. But this overrides the default implementation of mouse press event of the TreeView widget. This default implementation handles rows selection. In gtkmm tutorial for a TreeView there is an example for popup menus:http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-treeview-examples.html . In on_button_press_event of their custom TreeView they call TreeView::on_button_press_event(event);
| Code: |
bool TreeView_WithPopup::on_button_press_event(GdkEventButton* event)
{
//Call base class, to allow normal handling,
//such as allowing the row to be selected by the right-click:
bool return_value = TreeView::on_button_press_event(event);
//Then do our custom stuff:
if( (event->type == GDK_BUTTON_PRESS) && (event->button == 3) )
{
m_Menu_Popup.popup(event->button, event->time);
}
return return_value;
}
|
I need something like this in gtkD - is it possible? I don't want to handcode rows-selection behaviour because it is already done in gtk itself. |
|
| Back to top |
|
 |
eldar
Joined: 14 Jun 2008
Posts: 101
Location: Ufa, Russia
|
| Posted: Sun Sep 14, 2008 12:48 am Post subject: |
|
|
| I understood, that if I return false in event handler - the default handler will be called, but this is not suitable for me, because I need the default implementation of on_button_press to be called before my implementation - because it should select necessary Tree nodes, and only after that I will do something with this selection. |
|
| Back to top |
|
|
eldar
Joined: 14 Jun 2008
Posts: 101
Location: Ufa, Russia
|
| Posted: Sun Sep 14, 2008 8:55 am Post subject: |
|
|
So I did what I wanted to do in C:
| Code: |
typedef gboolean (*button_press) (GtkWidget *widget, GdkEventButton *event);
button_press tree_view_button_press = NULL;
gboolean view_onButtonPressed (GtkWidget *treeview, GdkEventButton *event, gpointer userdata)
{
g_print ("Single click on the tree view.\n");
gboolean result = tree_view_button_press(treeview, event);
view_popup_menu(treeview, event, userdata);
return result; /* we handled this */
}
create_view_and_model (void)
{
GtkWidget *view;
view = gtk_tree_view_new ();
...
tree_view_button_press = ((struct _GtkWidgetClass*)(G_OBJECT_GET_CLASS(view)))->button_press_event;
g_signal_connect(view, "button-press-event", (GCallback) view_onButtonPressed, NULL);
}
|
So what we need is access gtkWidgetClass structure fo a widget. Or it would be even better if it will be done like in gtkmm:
http://www.everfall.com/paste/id.php?8ei9j9w3bdex
It is a header for GtkWidget - necessary methods start from 350 line - the default event handlers. http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/sec-overriding-default-signal-handlers.html - here is the tutorial that explains it. Having in gtkD something like this will be nice. |
|
| Back to top |
|
|
Mike Wey
Joined: 07 May 2007
Posts: 428
|
| Posted: Sun Sep 14, 2008 9:15 am Post subject: |
|
|
| currently no, I'll try to get something working tonight. |
|
| Back to top |
|
|
Dubhead
Joined: 08 Sep 2008
Posts: 4
Location: Tokyo, Japan
|
| Posted: Sun Sep 14, 2008 10:04 am Post subject: |
|
|
| eldar wrote: | | I understood, that if I return false in event handler - the default handler will be called, but this is not suitable for me, because I need the default implementation of on_button_press to be called before my implementation - because it should select necessary Tree nodes, and only after that I will do something with this selection. |
Have you tried passing an optional parameter connectFlags=ConnectFlags.AFTER to addOnButtonPress() ? |
|
| Back to top |
|
|
eldar
Joined: 14 Jun 2008
Posts: 101
Location: Ufa, Russia
|
| Posted: Sun Sep 14, 2008 1:06 pm Post subject: |
|
|
| Dubhead, yes I tried. As I tried it in plain C gtk+: g_signal_connect_after(). Because the default implementation of an event handler returns true - my handler is not executed. So there is an only option to call the default handler explicitly and gtk+ API gives that possibility. |
|
| Back to top |
|
|
Mike Wey
Joined: 07 May 2007
Posts: 428
|
| Posted: Sun Sep 14, 2008 1:19 pm Post subject: |
|
|
| Added Widget.onButtonPressEvent(GdkEventButton* event) in svn r610, i'll add the others next. |
|
| Back to top |
|
|
Mike Wey
Joined: 07 May 2007
Posts: 428
|
| Posted: Mon Sep 15, 2008 3:28 am Post subject: |
|
|
| svn r612 adds the other Widget.on*Event functions. |
|
| Back to top |
|
|
eldar
Joined: 14 Jun 2008
Posts: 101
Location: Ufa, Russia
|
| Posted: Mon Sep 15, 2008 3:46 am Post subject: |
|
|
| Thank you! |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
