You definitively can use the events in Gtk::DrawingArea, since it is a
Gtk::Widget. Here is a primitive way how:
In constructor:
MyWidget::MyWidget{
this->mbDragging = false;
this->mbPressed = false;
set_events(
Gdk::BUTTON_PRESS_MASK // mouse button pressed
| Gdk::BUTTON_RELEASE_MASK // mouse button released
| Gdk::BUTTON1_MOTION_MASK // dragging left mouse button pressed
);
/* ... lots of code ... */
}
bool
MyWidget::on_button_press_event(GdkEventButton* event)
{
switch ( event->button ) // which mouse button?
{
case 2:
break;
case 3:
break;
}
mbPressed = true;
/* ... remember position here. Could be drag start! ... */
return true;
}
bool
MyWidget::on_button_release_event ( GdkEventButton* event )
{
mbPressed = false;
switch ( event->button )
{
case 1:
break;
case 2:
break;
case 3:
m_pPopup->popup ( 3, event->time ); // Contextmenu
break;
}
mbDragging = false;
return true;
}
/*
this is where it reacts on mouse dragging:
*/
bool
MyWidget::on_motion_notify_event ( GdkEventMotion* event )
{
if ( mbPressed )
{
mbDragging = true;
}
if ( ! mbDragging )
{
return true;
}
/* ... do something with event->x_root or event->x ... */
}
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