Started writing code for handling single-HWND controls on Windows. Similar code will exist for single-GtkWidget controls on GTK+ and single-NSView controls on Cocoa.

singlehandle_windows.c

@@ -0,0 +1,52 @@
+// 6 april 2015
+#include "tablepriv.h"
+
+// Common code for controls with a single window handle.
+// The only method NOT defined is preferredSize(); this differs between controls.
+
+static uintptr_t singleHandle(uiControl *c)
+{
+	return (uintptr_t) (c->hwnd);
+}
+
+//TODO	void (*setParent)(uiControl *, uintptr_t);
+
+static void singleResize(uiControl *c, intmax_t x, intmax_t y, intmax_t width, intmax_t height, uiSizing *d)
+{
+	if (MoveWindow(c->hwnd, x, y, width, height, TRUE) == 0)
+		logLastError("error moving control in singleResize()");
+}
+
+static void singleContainerShow(uiControl *c)
+{
+	ShowWindow(c->hwnd, SW_SHOW);
+}
+
+static void singleContainerHide(uiControl *c)
+{
+	ShowWindow(c->hwnd, SW_HIDE);
+}
+
+uiSingleHWNDControl *newSingleHWNDControl(DWORD exstyle, const WCHAR *class, DWORD style, HWND parent, HINSTANCE hInstance)
+{
+	uiSingleHWNDControl *c;
+
+	c = uiNew(uiSingleHWNDControl);
+	c->hwnd = CreateWindowExW(exstyle,
+		class, L"",
+		style | WS_CHILD | WS_VISIBLE,
+		0, 0,
+		100, 100,
+		// TODO specify control IDs properly
+		parent, NULL, hInstance, NULL);
+	if (c->hwnd == NULL)
+		logLastError("error creating control in newSingleHWNDControl()");
+
+	c->control.handle = singleHandle;
+//TODO	c->control.setParent = singleSetParent;
+	c->control.resize = singleResize;
+	c->control.containerShow = singleContainerShow;
+	c->control.containerHide = singleContainerHide;
+
+	return c;
+}

ui_windows.h

@@ -33,6 +33,8 @@
 
 // alloc_windows.c
 extern void *uiAlloc(size_t);
+// TODO use this in existing files
+#define uiNew(T) ((T *) uiAlloc(sizeof (T)))
 extern void *uiRealloc(void *, size_t);
 extern void uiFree(void *);
 
@@ -52,4 +54,14 @@ extern WCHAR *toUTF16(const char *);
 // window_windows.c
 extern ATOM registerWindowClass(HICON, HCURSOR);
 
+// singlehandle_windows.c
+typedef struct uiSingleHWNDControl uiSingleHWNDControl;
+struct uiSingleHWNDControl {
+	uiControl control;
+	HWND hwnd;
+	void (*voidEvent)(uiControl *, void *);
+	void *voidEventData;
+};
+extern uiSingleHWNDControl *newSingleHWNDControl(DWORD, const WCHAR *, DWORD, HWND, HINSTANCE);
+
 #endif

uipriv.h

@@ -9,11 +9,12 @@ struct uiSize {
 	intmax_t height;
 };
 
+// TODO handle destruction
 struct uiControl {
 	uintptr_t (*handle)(uiControl *);
-	void (*setParent)(uiControl *, uintptr_t);
+//TODO	void (*setParent)(uiControl *, uintptr_t);
 	uiSize (*preferredSize)(uiControl *, uiSizing *);
-	void (*resizing)(uiControl *, intmax_t, intmax_t, intmax_t, intmax_t, uiSizing *);
+	void (*resize)(uiControl *, intmax_t, intmax_t, intmax_t, intmax_t, uiSizing *);
 	void (*containerShow)(uiControl *);
 	void (*containerHide)(uiControl *);
 };