1 files changed, 120 insertions, 0 deletions
diff --git a/control_unix.go b/control_unix.go
new file mode 100644
index 0000000..10193e8
--- /dev/null
+++ b/control_unix.go
@@ -0,0 +1,120 @@
+// +build !windows,!darwin
+
+// 30 july 2014
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "gtk_unix.h"
+import "C"
+
+// all Controls that call base methods must be this
+type controlPrivate interface {
+	widget() *C.GtkWidget
+	Control
+}
+
+type controlParent struct {
+	c	*C.GtkContainer
+}
+
+func basesetParent(c controlPrivate, p *controlParent) {
+	widget := c.widget()		// avoid multiple interface lookups
+	C.gtk_container_add(p.c, widget)
+	// make sure the new widget is shown if not explicitly hidden
+	C.gtk_widget_show_all(widget)
+}
+
+func basepreferredSize(c controlPrivate, 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 basecommitResize(c controlPrivate, a *allocation, d *sizing) {
+	dobasecommitResize(c.widget(), a, d)
+}
+
+func dobasecommitResize(w *C.GtkWidget, c *allocation, 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(c.x)
+	r.y = C.int(c.y)
+	r.width = C.int(c.width)
+	r.height = C.int(c.height)
+	C.gtk_widget_size_allocate(w, &r)
+}
+
+func basegetAuxResizeInfo(c Control, d *sizing) {
+	// controls set this to true if a Label to its left should be vertically aligned to the control's top
+	d.shouldVAlignTop = false
+}
+
+type scroller struct {
+	scrollwidget		*C.GtkWidget
+	scrollcontainer		*C.GtkContainer
+	scrollwindow		*C.GtkScrolledWindow
+
+	overlaywidget		*C.GtkWidget
+	overlaycontainer	*C.GtkContainer
+	overlay			*C.GtkOverlay
+
+	addShowWhich		*C.GtkWidget
+}
+
+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 (s *scroller) setParent(p *controlParent) {
+	C.gtk_container_add(p.c, s.addShowWhich)
+	// see basesetParent() above for why we call gtk_widget_show_all()
+	C.gtk_widget_show_all(s.addShowWhich)
+}
+
+func (s *scroller) commitResize(c *allocation, d *sizing) {
+	dobasecommitResize(s.addShowWhich, c, d)
+}