Added Button and control adding to the Mac OS X backend.

redo/controls_darwin.go

@@ -0,0 +1,92 @@
+// 16 july 2014
+
+package ui
+
+import (
+	"unsafe"
+)
+
+// #include "objc_darwin.h"
+import "C"
+
+// TODO move to common_darwin.go
+func toBOOL(b bool) C.BOOL {
+	if b == true {
+		return C.YES
+	}
+	return C.NO
+}
+
+type widgetbase struct {
+	id		C.id
+	parentw	*window
+	floating	bool
+}
+
+func newWidget(id C.id) *widgetbase {
+	return &widgetbase{
+		id:	id,
+	}
+}
+
+// these few methods are embedded by all the various Controls since they all will do the same thing
+
+func (w *widgetbase) unparent() {
+	if w.parentw != nil {
+		C.unparent(w.id)
+		w.floating = true
+		w.parentw = nil
+	}
+}
+
+func (w *widgetbase) parent(win *window) {
+	C.parent(w.id, win.id, toBOOL(w.floating))
+	w.floating = false
+	w.parentw = win
+}
+
+type button struct {
+	*widgetbase
+}
+
+func newButton(text string) *Request {
+	c := make(chan interface{})
+	return &Request{
+		op:		func() {
+			ctext := C.CString(text)
+			defer C.free(unsafe.Pointer(ctext))
+			c <- &button{
+				widgetbase:	newWidget(C.newButton(ctext)),
+			}
+		},
+		resp:		c,
+	}
+}
+
+func (b *button) OnClicked(e func(c Doer)) *Request {
+	// TODO
+	return nil
+}
+
+func (b *button) Text() *Request {
+	c := make(chan interface{})
+	return &Request{
+		op:		func() {
+			c <- C.GoString(C.buttonText(b.id))
+		},
+		resp:		c,
+	}
+}
+
+func (b *button) SetText(text string) *Request {
+	c := make(chan interface{})
+	return &Request{
+		op:		func() {
+			ctext := C.CString(text)
+			defer C.free(unsafe.Pointer(ctext))
+			C.buttonSetText(b.id, ctext)
+			c <- struct{}{}
+		},
+		resp:		c,
+	}
+}

redo/controls_darwin.m

@@ -0,0 +1,47 @@
+// 16 july 2014
+
+#import "objc_darwin.h"
+#import "_cgo_export.h"
+#import <Cocoa/Cocoa.h>
+
+#define toNSView(x) ((NSView *) (x))
+#define toNSWindow(x) ((NSWindow *) (x))
+#define toNSButton(x) ((NSButton *) (x))
+
+void unparent(id control)
+{
+	[toNSView(control) retain];		// save from being freed when released by the removal selector below
+	// TODO removeFromSuperviewWithoutNeedingDisplay?
+	[toNSView(control) removeFromSuperview];
+}
+
+void parent(id control, id parentid, BOOL floating)
+{
+	[[toNSWindow(parentid) contentView] addSubview:toNSView(control)];
+	if (floating)		// previously unparented
+		[toNSView(control) release];
+}
+
+id newButton(char *text)
+{
+	NSButton *b;
+
+	// TODO cache the initial rect?
+	b = [[NSButton alloc] initWithFrame:NSMakeRect(0, 0, 100, 100)];
+	// TODO verify all of these against Interface Builder
+	[b setButtonType:NSMomentaryLightButton];
+	[b setTitle:[NSString stringWithUTF8String:text]];
+	[b setBordered:YES];
+	[b setBezelStyle:NSRoundedBezelStyle];
+	return b;
+}
+
+const char *buttonText(id button)
+{
+	return [[toNSButton(button) title] UTF8String];
+}
+
+void buttonSetText(id button, char *text)
+{
+	[toNSButton(button) setTitle:[NSString stringWithUTF8String:text]];
+}

redo/objc_darwin.h

@@ -26,4 +26,11 @@ extern void windowShow(id);
 extern void windowHide(id);
 extern void windowClose(id);
 
+/* controls_darwin.m */
+extern void unparent(id);
+extern void parent(id, id, BOOL);
+extern id newButton(char *);
+extern const char *buttonText(id);
+extern void buttonSetText(id, char *);
+
 #endif

redo/window_darwin.go

@@ -13,6 +13,8 @@ import "C"
 type window struct {
 	id		C.id
 
+	child		Control
+
 	closing	*event
 }
 
@@ -39,8 +41,12 @@ func (w *window) SetControl(control Control) *Request {
 	c := make(chan interface{})
 	return &Request{
 		op:		func() {
-			// TODO unparent
-			// TODO reparent
+			if w.child != nil {		// unparent existing control
+				w.child.unparent()
+			}
+			control.unparent()
+			control.parent(w)
+			w.child = control
 			c <- struct{}{}
 		},
 		resp:		c,
@@ -131,6 +137,3 @@ func windowResized(xw unsafe.Pointer, width C.uintptr_t, height C.uintptr_t) {
 _=w//TODO
 	fmt.Printf("new size %d x %d\n", width, height)
 }
-
-// TODO for testing
-func newButton(string) *Request { return nil }