Mostly completed writing Area on Windows. Now to fix compiler errors.

redo/area_windows.c

@@ -5,7 +5,7 @@
 #include "winapi_windows.h"
 #include "_cgo_epxort.h"
 
-LPWSTR areaWindowClass = L"gouiarea";
+#define areaWindowClass L"gouiarea"
 
 static void getScrollPos(HWND hwnd, int *xpos, int *ypos)
 {
@@ -441,3 +441,19 @@ DWORD makeAreaWindowClass(char **errmsg)
 	}
 	return 0;
 }
+
+HWND newArea(void *data)
+{
+	HWND hwnd;
+
+	hwnd = CreateWindowExW(
+		0,
+		areaWindowClass, L"",
+		WS_HSCROLL | WS_VSCROLL | WS_CHILD | WS_VISIBLE,
+		CW_USEDEFAULT, CW_USEDEFAULT,
+		100, 100,
+		msgwin, NULL, hInstance, data);
+	if (hwnd == NULL)
+		xpanic("container creation failed", GetLastError());
+	return hwnd;
+}

redo/area_windows.go

@@ -12,10 +12,43 @@ import (
 // #include "winapi_windows.h"
 import "C"
 
-const (
-	areastyle  = _WS_HSCROLL | _WS_VSCROLL | controlstyle
-	areaxstyle = 0 | controlxstyle
-)
+type area struct {
+	*areabase
+
+	_hwnd		C.HWND
+
+	clickCounter	*clickCounter
+}
+
+func registerAreaWndClass() (err error) {
+	var errmsg *C.char
+
+	err := C.makeWindowWindowClass(&errmsg)
+	if err != 0 || errmsg != nil {
+		return fmt.Errorf("%s: %v", C.GoString(errmsg), syscall.Errno(err))
+	}
+	return nil
+}
+
+func newArea(ab *areabase) Area {
+	a := &area{
+		areabase:		ab,
+		clickCounter:	new(clickCounter),
+	}
+	a._hwnd = C.newArea(unsafe.Pointer(a))
+	a.SetSize(width, height)
+	return a
+}
+
+func (a *area) SetSize(width, height int) {
+	a.width = width
+	a.height = height
+	C.SendMessageW(a._hwnd, C.msgAreaSizeChanged, 0, 0)
+}
+
+func (a *area) RepaintAll() {
+	C.SendMessageW(a._hwnd, C.msgAreaRepaintAll, 0, 0)
+}
 
 //export doPaint
 func doPaint(xrect *C.RECT, hscroll C.int, vscroll C.int, data unsafe.Pointer, dx *C.intptr_t, dy *C.intptr_t) unsafe.Pointer {
@@ -241,7 +274,11 @@ var modonlykeys = map[C.WPARAM]Modifiers{
 	C.VK_RWIN: Super,
 }
 
-// TODO storeAreaHWND
+//export storeAreaHWND
+func storeAreaHWND(data unsafe.Pointer, hwnd C.HWND) {
+	a := (*area)(data)
+	a._hwnd = hwnd
+}
 
 //export areaResetClickCounter
 func areaResetClickCounter(data unsafe.Pointer) {
@@ -249,12 +286,27 @@ func areaResetClickCounter(data unsafe.Pointer) {
 	a.clickCounter.reset()
 }
 
-func registerAreaWndClass() (err error) {
-	var errmsg *C.char
-
-	err := C.makeWindowWindowClass(&errmsg)
-	if err != 0 || errmsg != nil {
-		return fmt.Errorf("%s: %v", C.GoString(errmsg), syscall.Errno(err))
-	}
-	return nil
+func (a *area) hwnd() C.HWND {
+	return a._hwnd
+}
+
+func (a *area) setParent(p *controlParent) {
+	basesetParent(a, p)
+}
+
+func (a *area) allocate(x int, y int, width int, height int, d *sizing) []*allocation {
+	return baseallocate(a, x, y, width, height, d)
+}
+
+func (a *area) preferredSize(d *sizing) (width, height int) {
+	// the preferred size of an Area is its size
+	return a.width, a.height
+}
+
+func (a *area) commitResize(a *allocation, d *sizing) {
+	basecommitResize(a, a, d)
+}
+
+func (a *area) getAuxResizeInfo(d *sizing) {
+	basegetAuxResizeInfo(a, d)
 }

redo/winapi_windows.h

@@ -102,8 +102,8 @@ extern DWORD makeContainerWindowClass(char **);
 extern HWND newContainer(void *);
 
 /* area_window.c */
-extern LPWSTR areaWindowClass;
 extern void repaintArea(HWND);
 extern DWORD makeAreaWindowClass(char **);
+extern HWND newArea(void *);
 
 #endif