func newScroller(widget *C.GtkWidget, native bool, bordered bool, overlay bool) *scroller {
var o *C.GtkWidget
scrollwidget := C.gtk_scrolled_window_new(nil, nil)
if overlay {
o = C.gtk_overlay_new()
}
s := &scroller{
scrollwidget: scrollwidget,
scrollcontainer: (*C.GtkContainer)(unsafe.Pointer(scrollwidget)),
scrollwindow: (*C.GtkScrolledWindow)(unsafe.Pointer(scrollwidget)),
overlaywidget: o,
overlaycontainer: (*C.GtkContainer)(unsafe.Pointer(o)),
overlay: (*C.GtkOverlay)(unsafe.Pointer(o)),
}
// give the scrolled window a border (thanks to jlindgren in irc.gimp.net/#gtk+)
if bordered {
C.gtk_scrolled_window_set_shadow_type(s.scrollwindow, C.GTK_SHADOW_IN)
}
if native {
C.gtk_container_add(s.scrollcontainer, widget)
} else {
C.gtk_scrolled_window_add_with_viewport(s.scrollwindow, widget)
}
s.addShowWhich = s.scrollwidget
if overlay {
C.gtk_container_add(s.overlaycontainer, s.scrollwidget)
s.addShowWhich = s.overlaywidget
}
return s
}
func gtkAreaNew() *C.GtkWidget {
drawingarea := C.gtk_drawing_area_new()
// the Area's size will be set later
// we need to explicitly subscribe to mouse events with GtkDrawingArea
C.gtk_widget_add_events(drawingarea,
C.GDK_BUTTON_PRESS_MASK|C.GDK_BUTTON_RELEASE_MASK|C.GDK_POINTER_MOTION_MASK|C.GDK_BUTTON_MOTION_MASK|C.GDK_ENTER_NOTIFY_MASK|C.GDK_LEAVE_NOTIFY_MASK)
// and we need to allow focusing on a GtkDrawingArea to enable keyboard events
C.gtk_widget_set_can_focus(drawingarea, C.TRUE)
scrollarea := C.gtk_scrolled_window_new((*C.GtkAdjustment)(nil), (*C.GtkAdjustment)(nil))
// need a viewport because GtkDrawingArea isn't natively scrollable
C.gtk_scrolled_window_add_with_viewport((*C.GtkScrolledWindow)(unsafe.Pointer(scrollarea)), drawingarea)
return scrollarea
}
func newScroller(widget *C.GtkWidget, native bool, bordered bool, overlay bool) *scroller {
s := new(scroller)
s.controlSingleWidget = newControlSingleWidget(widget)
s.scrollwidget = C.gtk_scrolled_window_new(nil, nil)
s.scrollcontainer = (*C.GtkContainer)(unsafe.Pointer(s.scrollwidget))
s.scrollwindow = (*C.GtkScrolledWindow)(unsafe.Pointer(s.scrollwidget))
// any actual changing operations need to be done to the GtkScrolledWindow
// that is, everything /except/ preferredSize() are done to the GtkScrolledWindow
s.scroller = newControlSingleWidget(s.scrollwidget)
s.fsetParent = s.scroller.fsetParent
s.fresize = s.scroller.fresize
// in GTK+ 3.4 we still technically need to use the separate gtk_scrolled_window_add_with_viewpoint()/gtk_container_add() spiel for adding the widget to the scrolled window
if native {
C.gtk_container_add(s.scrollcontainer, s.widget)
} else {
C.gtk_scrolled_window_add_with_viewport(s.scrollwindow, s.widget)
}
// give the scrolled window a border (thanks to jlindgren in irc.gimp.net/#gtk+)
if bordered {
C.gtk_scrolled_window_set_shadow_type(s.scrollwindow, C.GTK_SHADOW_IN)
}
if overlay {
// ok things get REALLY fun now
// we now have to do all of the above again
s.overlaywidget = C.gtk_overlay_new()
s.overlaycontainer = (*C.GtkContainer)(unsafe.Pointer(s.overlaywidget))
s.overlayoverlay = (*C.GtkOverlay)(unsafe.Pointer(s.overlaywidget))
s.overlay = newControlSingleWidget(s.overlaywidget)
s.fsetParent = s.overlay.fsetParent
s.fresize = s.overlay.fresize
C.gtk_container_add(s.overlaycontainer, s.scrollwidget)
}
return s
}
