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// +build !windows,!darwin
// 30 july 2014
package ui
import (
"unsafe"
)
// #include "gtk_unix.h"
import "C"
type controlParent struct {
c *C.GtkContainer
}
type controlSingleWidget struct {
*controlbase
widget *C.GtkWidget
}
func newControlSingleWidget(widget *C.GtkWidget) *controlSingleWidget {
c := new(controlSingleWidget)
c.controlbase = &controlbase{
fsetParent: c.setParent,
fpreferredSize: c.preferredSize,
fresize: c.resize,
}
c.widget = widget
return c
}
func (c *controlSingleWidget) setParent(p *controlParent) {
C.gtk_container_add(p.c, c.widget)
// make sure the new widget is shown if not explicitly hidden
// TODO why did I have this again?
C.gtk_widget_show_all(c.widget)
}
func (c *controlSingleWidget) preferredSize(d *sizing) (int, int) {
// GTK+ 3 makes this easy: controls can tell us what their preferred size is!
// ...actually, it tells us two things: the "minimum size" and the "natural size".
// The "minimum size" is the smallest size we /can/ display /anything/. The "natural size" is the smallest size we would /prefer/ to display.
// The difference? Minimum size takes into account things like truncation with ellipses: the minimum size of a label can allot just the ellipses!
// So we use the natural size instead.
// There is a warning about height-for-width controls, but in my tests this isn't an issue.
var r C.GtkRequisition
C.gtk_widget_get_preferred_size(c.widget, nil, &r)
return int(r.width), int(r.height)
}
func (c *controlSingleWidget) resize(x int, y int, width int, height int, d *sizing) {
// as we resize on size-allocate, we have to also use size-allocate on our children
// this is fine anyway; in fact, this allows us to move without knowing what the container is!
// this is what GtkBox does anyway
// thanks to tristan in irc.gimp.net/#gtk+
var r C.GtkAllocation
r.x = C.int(x)
r.y = C.int(y)
r.width = C.int(width)
r.height = C.int(height)
C.gtk_widget_size_allocate(c.widget, &r)
}
type scroller struct {
*controlSingleWidget
scroller *controlSingleWidget
scrollwidget *C.GtkWidget
scrollcontainer *C.GtkContainer
scrollwindow *C.GtkScrolledWindow
overlay *controlSingleWidget
overlaywidget *C.GtkWidget
overlaycontainer *C.GtkContainer
overlayoverlay *C.GtkOverlay
}
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.overlayoverlay))
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
}
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