CODEWITHSUNDEEP
c++gtkgtkmm
marko
marko

Reputation: 327

Gtk / Gtkmm Kinetic Scrolling

I am designing a GUI that requires kinetic scrolling for my application and I am using GTK (coming from Qt) and I have the following code:

   Gtk::Window * wnd          = new Gtk::Window();
   Gtk::ScrolledWindow * scr  = new Gtk::ScrolledWindow();
   Gtk::Layout * lay          = new Gtk::Layout();
   Gtk::VBox *   vbox         = new Gtk::VBox();

   wnd->add(*scr);
   scr->add(*vbox);

   for (int i = 0; i < 20; i++)
   {
      Gtk::Button * btn = new Gtk::Button();
      btn->set_label("Click Me");

      vbox->pack_start(*btn);
      btn->show();
   }

   scr->set_kinetic_scrolling(true);

   wnd->show();
   scr->show();
   lay->show();
   vbox->show();

and this is what you get:

enter image description here

This link tells me the following:

void Gtk::ScrolledWindow::set_kinetic_scrolling ( bool kinetic_scrolling = true )

Turns kinetic scrolling on or off.

Kinetic scrolling only applies to devices with source Gdk::SOURCE_TOUCHSCREEN.

Since gtkmm 3.4:

Parameters kinetic_scrolling true to enable kinetic scrolling.

I tried grabbing the button with the mouse and to kinetically scroll but as expected, it does not work. I don't have a touch screen yet and I need to experiment with my mouse, Is there any way I can do this?

I also found the following:

enum InputSource {
  SOURCE_MOUSE,
  SOURCE_PEN,
  SOURCE_ERASER,
  SOURCE_CURSOR,
  SOURCE_KEYBOARD,
  SOURCE_TOUCHSCREEN,
  SOURCE_TOUCHPAD,
  SOURCE_TRACKPOINT,
  SOURCE_TABLET_PAD
}
    An enumeration describing the type of an input device in general terms.

Is there any way I can emulate the type of device? I want to see it working.

Upvotes: 4

Views: 510

Answers (1)

Jos&#233; Fonte
Jos&#233; Fonte

Reputation: 4104

You must have a touch event. Use GtkInspector (Ctrl+Shift+I) then in the Visual tab, set Simulate touchscreen (as shown below):

enter image description here

It should work. More on Gtk Inspector

Upvotes: 4

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