Re: Custom container and mouse events

[Matthew Bucknall <matt mattbucknall com>]

Never mind, I've solved the problem. Hadn't created a Gdk::Window for
the container.

Matthew Bucknall wrote:
> Hello,
>
> I'm try to implement a custom container which allows the user to resize
> the widgets it contains (similar to Paned, but allowing more than 2
> widgets). Nesting Paned containers to achieve this leads to unintuitive
> behavior.
>
> The layout code is complete and works great. Being fairly new to gtk and
> gtkmm, I'm having some issues getting the container class to receive
> button press/release and motion notify events. Currently I am overriding
> on_button_press_event, on_button_release_event, and
> on_motion_notify_event to handle user interaction.
>
> I've noticed, when I put notebook widgets inside the container, the
> container's motion notify event handler gets called any time the mouse
> moves across the notebook tabs (but not the body of the page), with x
> and y relative to the top-left point of each tab. When the pointer is in
> a space between the container's children, I get no motion notify events
> at all. Please could someone give me some insight as to what is
> happening there?
>
> Also, I get responses to button press/release events only if I click in
> certain places on the notebook tabs, but not in the container's
> uninhabited space. The strange thing is, these responses are
> intermittent. Sometimes a certain point on a notebook tab triggers the
> event, sometimes it does not. This all seems a bit weird to me.
>
> Essentially what I want is for the container to respond to mouse events
> so that the user can drag the gap in between each contained widget left
> or right to change the size of the widgets either side of it.
>
> Apart from initializing various private members, my constructor
> currently only calls the following (I'm sure I should be doing a lot
> more, but I'm not sure what):
>
> set_flags(Gtk::NO_WINDOW);
>     set_events(get_events() | Gdk::EXPOSURE_MASK |
> Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK |
> Gdk::POINTER_MOTION_MASK | Gdk::POINTER_MOTION_HINT_MASK);
>
> Any help much appreciated. Thanks.
>
> Matt.
>
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