Re: Problem with EventBox enter/leave_notify_event and Buttons

[Bill Czermak <czermak netspace net au>]

A few comments.

Is the problem with gtk or the vala wrappers?

Setup a simple test with just a single eventbox in vala.

If you still have the problem then recode in C.

Check that after processing the callback on the button, it returns 
true/false to stop the callback being passed to the parent.

Rgds Bill


On 27/07/11 05:07, Valentín wrote:
> Hello!!
>
> I have a problem with enter_notify_event and leave_notify_event. Let me
> explain:
>
> I have an VBox with 5 EventBox widgets, and inside each EventBox I have a
> HBox with one Label and 2 Buttons. I connect the signals enter_notify_event
> and leave_notify_event of each of the EventBox widgets to a callback and
> everything seems to work well: If you move the mouse pointer vertically
> between EventBox widgets you can see the events --I print a message from
> those mentioned callbacks, and I also modify the Labels making their text
> bold on enter_notify_event and normal on leave_notify_event.
>
> But If you move the mouse pointer horizontally --within the same EventBox--
> you'll also get enter/leave_notify_events, and this shouldn't happen since
> the mouse pointer is always inside the EventBox. More precisely, you'll get
> a leave_notify_event when moving the pointer to a button (although the
> button is a child of the EventBox) and the corresponding enter_notify_event
> when going back from the button's area to another area also inside the
> EventBox.
>
> I can solve this by setting above-child propriety of the EventBox to TRUE,
> but this way I can't click the buttons :S
>
> Below you can see an example written in Vala --if for some reason you don't
> like Vala, I could rewrite it in C... I did it in Vala because it is
> quicker.
>
> How could I solve this situation?
>
>
> private const int CONTROL_SPACING = 8;
> private const int FRAME_BORDER = 6;
>
> public class TestWidget : Gtk.HBox {
>      public Gtk.Button edit_button;
>      public Gtk.Button delete_button;
>      public Gtk.Label label;
>
>      private Pango.AttrList attrs_bold;
>      private Pango.AttrList attrs_normal;
>
>      public TestWidget (string name) {
>          homogeneous = true;
>          spacing = CONTROL_SPACING;
>
>          attrs_bold = new Pango.AttrList();
>          attrs_bold.insert(Pango.attr_weight_new(Pango.Weight.BOLD));
>          attrs_normal = new Pango.AttrList();
>          attrs_normal.insert(Pango.attr_weight_new(Pango.Weight.NORMAL));
>
>          edit_button = new Gtk.Button.from_stock(Gtk.Stock.EDIT);
>          delete_button = new Gtk.Button.from_stock(Gtk.Stock.DELETE);
>
>          label = new Gtk.Label(name);
>          label.set_alignment(0f, 0.5f);
>
>          add(label);
>          add(edit_button);
>          add(delete_button);
>      }
>
>      public bool on_enter_notify_event() {
>          label.set_attributes(attrs_bold);
>
>          stdout.printf("enter_notify_event\n");
>
>          return true;
>      }
>
>      public bool on_leave_notify_event() {
>          label.set_attributes(attrs_normal);
>
>          stdout.printf("leave_notify_event\n");
>
>          return true;
>      }
> }
>
> public class TestWindow : Gtk.Window {
>      private Gtk.VBox widgets_layout = null;
>      private Gtk.VBox layout = null;
>
>      public TestWindow() {
>
>          widgets_layout = new Gtk.VBox(false, CONTROL_SPACING);
>          widgets_layout.set_border_width(FRAME_BORDER);
>
>          layout = new Gtk.VBox(false, CONTROL_SPACING);
>          layout.pack_start(widgets_layout, false);
>
>          add(layout);
>      }
>
>      public void add_widget(TestWidget widget) {
>
>          widget.edit_button.clicked.connect(edit_working);
>          widget.delete_button.clicked.connect(delete_working);
>
>          Gtk.EventBox event_box = new Gtk.EventBox();
> //~         event_box.set_above_child(true);
>
>          event_box.add_events(Gdk.EventMask.ENTER_NOTIFY_MASK |
> Gdk.EventMask.LEAVE_NOTIFY_MASK);
>
>          event_box.add(widget);
>          event_box.enter_notify_event.connect(widget.on_enter_notify_event);
>          event_box.leave_notify_event.connect(widget.on_leave_notify_event);
>
>          widgets_layout.pack_start(event_box, false);
>          widgets_layout.show_all();
>      }
>
>      public void edit_working() {
>          stdout.printf("Edit button is working\n");
>      }
>
>      public void delete_working() {
>          stdout.printf("Delete button is working\n");
>      }
> }
>
> public class Test : Object {
>      public static int main(string[] args) {
>          Gtk.init(ref args);
>
>          TestWindow window = new TestWindow();
>          window.title = "enter/leave_notify_event test";
>          window.destroy.connect(Gtk.main_quit);
>
>          window.add_widget(new TestWidget("Test 01"));
>          window.add_widget(new TestWidget("Test 02"));
>          window.add_widget(new TestWidget("Test 03"));
>          window.add_widget(new TestWidget("Test 04"));
>          window.add_widget(new TestWidget("Test 05"));
>
>          window.show_all();
>
>          Gtk.main();
>
>          return 0;
>      }
> }
>
> You can compile it using
>      valac ./test.vala --pkg=gtk+-2.0
> or
>      valac ./test.vala --pkg=gtk+-3.0
>
> Thanks a lot for your time.
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