Re: Widget movement signal in custom widget

["Marco Scholten" <mscholtn xs4all nl>]

Why don't you use a Gtk::Layout instead of a DrawingArea, then you can add 
the progressbar as a child widget and show it on button press and hide it on 
button release.

--
Marco

----- Original Message ----- 
From: "Matt Strange" <mstrange wans net>
To: <gtkmm-list gnome org>
Sent: Thursday, July 07, 2005 9:31 AM
Subject: Widget movement signal in custom widget


> Hello All,
>        I am trying to creating a custom widget which has a
> Gtk::Progressbar floating above it in a popup Window.  The
> Progressbar's window only appears when the mouse button is down (it's
> hidden the rest of the time).  To keep the floating Progressbar in
> the
> correct position relative to the widget, I need to have the
> Progressbar's popup window move whenever the custom widget is moved.
> However, I cannot find the right signal for the "widget moved" event.
> The generally recommended "configure_event" signal is only called on
> resizing signals, even with all GdkEventFlags on.
>        Assuming there is no better way to link this floating
> Progressbar to the custom widget (e.g. a method which makes moving
> the
> Progressbar unnecessary), I would appreciate any help adding a method
> to the CustomDrawingArea (see code below) which is called when the
> widget is moved (`on_configure_event' attempts to do that in the
> example code).
>        The following code is modified from one of the Tutorial
> Examples and is simply an overridden DrawingArea with the additional
> Progressbar.  Note that `on_configure_event' is only called when the
> widget is resized; `on_configure_event' is not called when the widget
> is moved.
>
> Thank you very much for your time,
> Matt Strange
>
> //test1.cpp
> #include <iostream>
> #include <gtkmm/main.h>
> #include <gtkmm/drawingarea.h>
> #include <gtkmm/window.h>
> #include <gtkmm/progressbar.h>
>
> class CustomDrawingArea : public Gtk::DrawingArea
> {
> public:
>  CustomDrawingArea(int x_size = 0, int y_size = 0);
>  ~CustomDrawingArea();
>  virtual bool on_expose_event(GdkEventExpose* event);
>  virtual bool on_configure_event(GdkEventConfigure* event);
>  virtual bool on_button_press_event(GdkEventButton* event);
>  virtual bool on_button_release_event(GdkEventButton* event);
> protected:
>  int m_width, m_height;
>  Gtk::ProgressBar* _progressbar;
>  Gtk::Window* _progressbar_window;
> };
>
> CustomDrawingArea::CustomDrawingArea(int x_size, int y_size)
>  : DrawingArea(), m_width(x_size), m_height(y_size)
> {
>  set_size_request(m_width, m_height);
>  // note: STRUCTURE_MASK should make the configure events
>  // recievable...
>  add_events(Gdk::STRUCTURE_MASK | Gdk::BUTTON_PRESS_MASK |
>             Gdk::BUTTON_RELEASE_MASK);
>
>  // make the progressbar & a popup window that it sits in
>  _progressbar_window = new Gtk::Window(Gtk::WINDOW_POPUP);
>  _progressbar = manage(new Gtk::ProgressBar);
>  _progressbar->set_size_request(10,50);
>  _progressbar->set_orientation(Gtk::PROGRESS_BOTTOM_TO_TOP);
>  _progressbar_window->add(*_progressbar);
> }
> CustomDrawingArea::
> ~CustomDrawingArea()
> {
>  delete _progressbar_window;
> }
>
> bool CustomDrawingArea::on_expose_event(GdkEventExpose*)
> {
>  Glib::RefPtr<Gdk::Window> win = get_window();
>  Glib::RefPtr<Gdk::GC> some_gc = Gdk::GC::create(win);
>
>  Gdk::Color some_color("white");
>  Glib::RefPtr<Gdk::Colormap> some_colormap =
>        get_default_colormap();
>  some_colormap->alloc_color(some_color);
>  some_gc->set_foreground(some_color);
>
>  //Draw circle
>  win->draw_arc(some_gc, true, 0, 0, 50, 50, 0, 23040);
>
>  return true;
> }
>
> bool
> CustomDrawingArea::on_configure_event(GdkEventConfigure* event)
> {
>  std::cerr << "on_configure_event called\n";
>  // ERROR: this is only called when the window is resized, how to
>  // call when moved?
>  int x,y;
>  get_window()->get_origin(x,y);
>  _progressbar_window->move(x+50,y);
>  return true;
> }
>
> bool
> CustomDrawingArea::on_button_press_event(GdkEventButton* event)
> {
>  _progressbar_window->show_all();
>  return true;
> }
>
> bool
> CustomDrawingArea::on_button_release_event(GdkEventButton* event)
> {
>  _progressbar_window->hide();
>  return true;
> }
>
> int
> main(int argc, char* argv[])
> {
>  Gtk::Main gtk_main(argc, argv);
>
>  Gtk::Window window;
>  CustomDrawingArea my_widget(200,200);
>
>  window.add(my_widget);
>
>  window.show_all();
>
>  gtk_main.run(window);
>
>  return 0;
> }
>
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