Fixed control positioning on GTK+. This will also "fix" control positioning on Windows; next commit.

newctrl/container_unix.go

@@ -50,6 +50,15 @@ func (c *container) allocation(margined bool) C.GtkAllocation {
 	return a
 }
 
+// we can just return these values as is
+// note that allocations of a widget on GTK+ have their origin in the /window/ origin
+func (c *container) bounds(d *sizing) (int, int, int, int) {
+	var a C.GtkAllocation
+
+	C.gtk_widget_get_allocation(c.widget, &a)
+	return int(a.x), int(a.y), int(a.width), int(a.height)
+}
+
 const (
 	gtkXMargin  = 12
 	gtkYMargin  = 12

newctrl/grid.go

@@ -205,6 +205,8 @@ func (g *grid) resize(x int, y int, width int, height int, d *sizing) {
 		return
 	}
 
+	x, y, width, height = g.container.bounds(d)
+
 	// -2) get this Grid's padding
 	xpadding := d.xpadding
 	ypadding := d.ypadding

newctrl/simplegrid.go

@@ -136,6 +136,7 @@ func (g *simpleGrid) resize(x int, y int, width int, height int, d *sizing) {
 	if len(g.controls) == 0 {
 		return
 	}
+	x, y, width, height = g.container.bounds(d)
 	// -1) get this SimpleGrid's padding
 	xpadding := d.xpadding
 	ypadding := d.ypadding
@@ -146,9 +147,6 @@ func (g *simpleGrid) resize(x int, y int, width int, height int, d *sizing) {
 	// 0) inset the available rect by the needed padding and reset x/y for children
 	width -= (len(g.colwidths) - 1) * xpadding
 	height -= (len(g.rowheights) - 1) * ypadding
-	// TODO get the correct client rect
-	x = 0
-	y = 0
 	// 1) clear data structures
 	for i := range g.rowheights {
 		g.rowheights[i] = 0

newctrl/stack.go

@@ -92,6 +92,7 @@ func (s *stack) resize(x int, y int, width int, height int, d *sizing) {
 	if len(s.controls) == 0 { // do nothing if there's nothing to do
 		return
 	}
+	x, y, width, height = s.container.bounds(d)
 	// -1) get this Stack's padding
 	xpadding := d.xpadding
 	ypadding := d.ypadding
@@ -99,14 +100,12 @@ func (s *stack) resize(x int, y int, width int, height int, d *sizing) {
 		xpadding = 0
 		ypadding = 0
 	}
-	// 0) inset the available rect by the needed padding and reset the x/y coordinates for the children
+	// 0) inset the available rect by the needed padding
 	if s.orientation == horizontal {
 		width -= (len(s.controls) - 1) * xpadding
 	} else {
 		height -= (len(s.controls) - 1) * ypadding
 	}
-	x = 0
-	y = 0
 	// 1) get height and width of non-stretchy controls; figure out how much space is alloted to stretchy controls
 	stretchywid = width
 	stretchyht = height