Migrated the GTK+ backend to the new new container system in which containers are no longer full controls but are still used to hold more than one control and handle the resizing entirely on their own.

container_unix.c

@@ -59,6 +59,7 @@ static void goContainer_remove(GtkContainer *container, GtkWidget *widget)
 static void goContainer_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
 {
 	gtk_widget_set_allocation(widget, allocation);
+	containerResize(GOCONTAINER(widget)->gocontainer, allocation);
 }
 
 struct forall {

container_unix.go

@@ -11,9 +11,12 @@ import (
 // #include "gtk_unix.h"
 import "C"
 
+// TODO avoid direct access to contents?
 type container struct {
-	*controlSingleWidget
-	container *C.GtkContainer
+	widget		*C.GtkWidget
+	container		*C.GtkContainer
+	resize		func(x int, y int, width int, height int, d *sizing)
+	margined		bool
 }
 
 type sizing struct {
@@ -28,7 +31,7 @@ type sizing struct {
 
 func newContainer() *container {
 	c := new(container)
-	c.controlSingleWidget = newControlSingleWidget(C.newContainer(unsafe.Pointer(c)))
+	c.widget = C.newContainer(unsafe.Pointer(c))
 	c.container = (*C.GtkContainer)(unsafe.Pointer(c.widget))
 	return c
 }
@@ -37,26 +40,19 @@ func (c *container) parent() *controlParent {
 	return &controlParent{c.container}
 }
 
-func (c *container) allocation(margined bool) C.GtkAllocation {
-	var a C.GtkAllocation
-
-	C.gtk_widget_get_allocation(c.widget, &a)
-	if margined {
+//export containerResize
+func containerResize(data unsafe.Pointer, aorig *C.GtkAllocation) {
+	c := (*container)(data)
+	d := beginResize()
+	// copy aorig
+	a := *aorig
+	if c.margined {
 		a.x += C.int(gtkXMargin)
 		a.y += C.int(gtkYMargin)
 		a.width -= C.int(gtkXMargin) * 2
 		a.height -= C.int(gtkYMargin) * 2
 	}
-	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)
+	c.resize(int(a.x), int(a.y), int(a.width), int(a.height), d)
 }
 
 const (
@@ -66,7 +62,7 @@ const (
 	gtkYPadding = 6
 )
 
-func (w *window) beginResize() (d *sizing) {
+func beginResize() (d *sizing) {
 	d = new(sizing)
 	d.xpadding = gtkXPadding
 	d.ypadding = gtkYPadding

group_unix.go

@@ -18,10 +18,6 @@ type group struct {
 
 	child			Control
 	container		*container
-
-	margined		bool
-
-	chainresize	func(x int, y int, width int, height int, d *sizing)
 }
 
 func newGroup(text string, control Control) Group {
@@ -54,10 +50,8 @@ func newGroup(text string, control Control) Group {
 
 	g.container = newContainer()
 	g.child.setParent(g.container.parent())
-	g.container.setParent(&controlParent{g.gcontainer})
-
-	g.chainresize = g.fresize
-	g.fresize = g.xresize
+	g.container.resize = g.child.resize
+	C.gtk_container_add(g.gcontainer, g.container.widget)
 
 	return g
 }
@@ -73,18 +67,11 @@ func (g *group) SetText(text string) {
 }
 
 func (g *group) Margined() bool {
-	return g.margined
+	return g.container.margined
 }
 
 func (g *group) SetMargined(margined bool) {
-	g.margined = margined
+	g.container.margined = margined
 }
 
-func (g *group) xresize(x int, y int, width int, height int, d *sizing) {
-	// first, chain up to change the GtkFrame and its child container
-	g.chainresize(x, y, width, height, d)
-
-	// now that the container has the correct size, we can resize the child
-	a := g.container.allocation(g.margined)
-	g.child.resize(int(a.x), int(a.y), int(a.width), int(a.height), d)
-}
+// no need to override resize; the child container handles that for us

tab_unix.go

@@ -18,8 +18,6 @@ type tab struct {
 
 	tabs []*container
 	children	[]Control
-
-	chainresize	func(x int, y int, width int, height int, d *sizing)
 }
 
 func newTab() Tab {
@@ -29,8 +27,6 @@ func newTab() Tab {
 		container: (*C.GtkContainer)(unsafe.Pointer(widget)),
 		notebook:  (*C.GtkNotebook)(unsafe.Pointer(widget)),
 	}
-	t.chainresize = t.fresize
-	t.fresize = t.xresize
 	// there are no scrolling arrows by default; add them in case there are too many tabs
 	C.gtk_notebook_set_scrollable(t.notebook, C.TRUE)
 	return t
@@ -40,8 +36,9 @@ func (t *tab) Append(name string, control Control) {
 	c := newContainer()
 	t.tabs = append(t.tabs, c)
 	// this calls gtk_container_add(), which, according to gregier in irc.gimp.net/#gtk+, acts just like gtk_notebook_append_page()
-	c.setParent(&controlParent{t.container})
+	C.gtk_container_add(t.container, c.widget)
 	control.setParent(c.parent())
+	c.resize = control.resize
 	t.children = append(t.children, control)
 	cname := togstr(name)
 	defer freegstr(cname)
@@ -51,13 +48,4 @@ func (t *tab) Append(name string, control Control) {
 		cname)
 }
 
-func (t *tab) xresize(x int, y int, width int, height int, d *sizing) {
-	// first, chain up to change the GtkFrame and its child container
-	t.chainresize(x, y, width, height, d)
-
-	// now that the containers have the correct size, we can resize the children
-	for i, _ := range t.tabs {
-		a := t.tabs[i].allocation(false/*TODO*/)
-		t.children[i].resize(int(a.x), int(a.y), int(a.width), int(a.height), d)
-	}
-}
+// no need to handle resize; the children containers handle that for us

window_unix.go

@@ -10,7 +10,6 @@ import (
 
 // #include "gtk_unix.h"
 // extern gboolean windowClosing(GtkWidget *, GdkEvent *, gpointer);
-// extern void windowResized(GtkWidget *, GdkRectangle *, gpointer);
 import "C"
 
 type window struct {
@@ -25,8 +24,6 @@ type window struct {
 
 	child			Control
 	container		*container
-
-	margined		bool
 }
 
 func newWindow(title string, width int, height int, control Control) *window {
@@ -50,13 +47,8 @@ func newWindow(title string, width int, height int, control Control) *window {
 	C.gtk_window_resize(w.window, C.gint(width), C.gint(height))
 	w.container = newContainer()
 	w.child.setParent(w.container.parent())
-	w.container.setParent(&controlParent{w.wc})
-	// notice that we connect this to the container
-	g_signal_connect_after(		// so we get it after the child container has been allocated
-		C.gpointer(unsafe.Pointer(w.container.widget)),
-		"size-allocate",
-		C.GCallback(C.windowResized),
-		C.gpointer(unsafe.Pointer(w)))
+	w.container.resize = w.child.resize
+	C.gtk_container_add(w.wc, w.container.widget)
 	// for dialogs; otherwise, they will be modal to all windows, not just this one
 	w.group = C.gtk_window_group_new()
 	C.gtk_window_group_add_window(w.group, w.window)
@@ -90,11 +82,11 @@ func (w *window) OnClosing(e func() bool) {
 }
 
 func (w *window) Margined() bool {
-	return w.margined
+	return w.container.margined
 }
 
 func (w *window) SetMargined(margined bool) {
-	w.margined = margined
+	w.container.margined = margined
 }
 
 //export windowClosing
@@ -107,10 +99,4 @@ func windowClosing(wid *C.GtkWidget, e *C.GdkEvent, data C.gpointer) C.gboolean
 	return C.GDK_EVENT_STOP // keeps window alive
 }
 
-//export windowResized
-func windowResized(wid *C.GtkWidget, r *C.GdkRectangle, data C.gpointer) {
-	w := (*window)(unsafe.Pointer(data))
-	a := w.container.allocation(w.margined)
-	d := w.beginResize()
-	w.child.resize(int(a.x), int(a.y), int(a.width), int(a.height), d)
-}
+// no need for windowResized; the child container takes care of that