Added uiAreaHandler.RedrawOnResize() to handle redrawing on resizes.

gtkarea/area.c

@@ -113,6 +113,8 @@ static void areaWidget_size_allocate(GtkWidget *w, GtkAllocation *allocation)
 	ap->clientWidth = allocation->width;
 	ap->clientHeight = allocation->height;
 	updateScroll(areaWidget(w));
+	if ((*(ap->ah->RedrawOnResize))(ap->ah, ap->a))
+		gtk_widget_queue_resize(w);
 }
 
 static gboolean areaWidget_draw(GtkWidget *w, cairo_t *cr)

gtkarea/main.c

@@ -99,6 +99,11 @@ static uintmax_t handlerVScrollMax(uiAreaHandler *a, uiArea *area)
 	return gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(nvspinb));
 }
 
+static int handlerRedrawOnResize(uiAreaHandler *a, uiArea *area)
+{
+	return 1;
+}
+
 static void recalcScroll(GtkSpinButton *sb, gpointer data)
 {
 	areaUpdateScroll(area);
@@ -124,6 +129,7 @@ int main(void)
 	h.ah.Draw = handlerDraw;
 	h.ah.HScrollMax = handlerHScrollMax;
 	h.ah.VScrollMax = handlerVScrollMax;
+	h.ah.RedrawOnResize = handlerRedrawOnResize;
 
 	gtk_init(NULL, NULL);
 

gtkarea/ui.h

@@ -10,6 +10,7 @@ struct uiAreaHandler {
 	void (*Draw)(uiAreaHandler *, uiArea *, uiAreaDrawParams *);
 	uintmax_t (*HScrollMax)(uiAreaHandler *, uiArea *);
 	uintmax_t (*VScrollMax)(uiAreaHandler *, uiArea *);
+	int (*RedrawOnResize)(uiAreaHandler *, uiArea *);
 };
 
 struct uiAreaDrawParams {

macarea/alt/area.m

@@ -287,6 +287,9 @@ struct uiArea {
 	// and update the scrolling position
 	[self hscrollTo:self->hscrollpos];
 	[self vscrollTo:self->vscrollpos];
+
+	if ((*(self->libui_a->ah->RedrawOnResize))(self->libui_a->ah, self->libui_a))
+		[self->drawingView setNeedsDisplay:YES];
 }
 
 - (IBAction)hscrollEvent:(id)sender

macarea/alt/main.m

@@ -105,6 +105,11 @@ static uintmax_t handlerVScrollMax(uiAreaHandler *a, uiArea *area)
 	return _wtoi(c);
 */}
 
+static int handlerRedrawOnResize(uiAreaHandler *a, uiArea *area)
+{
+	return 1;
+}
+
 // areaUpdateScroll(area);
 
 @interface appDelegate : NSObject<NSApplicationDelegate, NSTextFieldDelegate>
@@ -162,6 +167,7 @@ int main(void)
 	h.ah.Draw = handlerDraw;
 	h.ah.HScrollMax = handlerHScrollMax;
 	h.ah.VScrollMax = handlerVScrollMax;
+	h.ah.RedrawOnResize = handlerRedrawOnResize;
 
 	app = [NSApplication sharedApplication];
 	[app setActivationPolicy:NSApplicationActivationPolicyRegular];

macarea/alt/ui.h

@@ -10,6 +10,7 @@ struct uiAreaHandler {
 	void (*Draw)(uiAreaHandler *, uiArea *, uiAreaDrawParams *);
 	uintmax_t (*HScrollMax)(uiAreaHandler *, uiArea *);
 	uintmax_t (*VScrollMax)(uiAreaHandler *, uiArea *);
+	int (*RedrawOnResize)(uiAreaHandler *, uiArea *);
 };
 
 struct uiAreaDrawParams {

macarea/main.m

@@ -105,6 +105,11 @@ static uintmax_t handlerVScrollMax(uiAreaHandler *a, uiArea *area)
 	return _wtoi(c);
 */}
 
+static int handlerRedrawOnResize(uiAreaHandler *a, uiArea *area)
+{
+	return 1;
+}
+
 // areaUpdateScroll(area);
 
 @interface appDelegate : NSObject<NSApplicationDelegate, NSTextFieldDelegate>
@@ -162,6 +167,7 @@ int main(void)
 	h.ah.Draw = handlerDraw;
 	h.ah.HScrollMax = handlerHScrollMax;
 	h.ah.VScrollMax = handlerVScrollMax;
+	h.ah.RedrawOnResize = handlerRedrawOnResize;
 
 	app = [NSApplication sharedApplication];
 	[app setActivationPolicy:NSApplicationActivationPolicyRegular];

macarea/ui.h

@@ -10,6 +10,7 @@ struct uiAreaHandler {
 	void (*Draw)(uiAreaHandler *, uiArea *, uiAreaDrawParams *);
 	uintmax_t (*HScrollMax)(uiAreaHandler *, uiArea *);
 	uintmax_t (*VScrollMax)(uiAreaHandler *, uiArea *);
+	int (*RedrawOnResize)(uiAreaHandler *, uiArea *);
 };
 
 struct uiAreaDrawParams {

winarea/area.c

@@ -257,6 +257,7 @@ static LRESULT CALLBACK areaWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM
 	HDC dc;
 	PAINTSTRUCT ps;
 	RECT client;
+	WINDOWPOS *wp = (WINDOWPOS *) lParam;
 
 	a = (uiArea *) GetWindowLongPtrW(hwnd, GWLP_USERDATA);
 	if (a == NULL) {
@@ -281,6 +282,13 @@ static LRESULT CALLBACK areaWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM
 			logLastError("error getting client rect in WM_PRINTCLIENT in areaWndProc()");
 		doPaint(a, (HDC) wParam, &client, &client);
 		return 0;
+	case WM_WINDOWPOSCHANGED:
+		if ((wp->flags & SWP_NOSIZE) != 0)
+			break;
+		if ((*(a->ah->RedrawOnResize))(a->ah, a))
+			if (InvalidateRect(a->hwnd, NULL, TRUE) == 0)
+				logLastError("error redrawing area on resize in areaWndProc()");
+		return 0;
 	case WM_HSCROLL:
 		hscroll(a, wParam, lParam);
 		return 0;
@@ -312,7 +320,7 @@ ATOM registerAreaClass(void)
 //TODO	wc.hIcon = hDefaultIcon;
 //TODO	wc.hCursor = hDefaultCursor;
 	wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
-	wc.style = CS_HREDRAW | CS_VREDRAW;
+	// don't specify CS_HREDRAW or CS_VREDRAW; that's decided by the uiAreaHandler in RedrawOnResize()
 	return RegisterClassW(&wc);
 }
 

winarea/main.c

@@ -105,6 +105,11 @@ static uintmax_t handlerVScrollMax(uiAreaHandler *a, uiArea *area)
 	return _wtoi(c);
 }
 
+static int handlerRedrawOnResize(uiAreaHandler *a, uiArea *area)
+{
+	return 1;
+}
+
 static void repos(HWND hwnd)
 {
 	RECT r;
@@ -155,6 +160,7 @@ int main(void)
 	h.ah.Draw = handlerDraw;
 	h.ah.HScrollMax = handlerHScrollMax;
 	h.ah.VScrollMax = handlerVScrollMax;
+	h.ah.RedrawOnResize = handlerRedrawOnResize;
 
 	registerAreaClass();
 

winarea/ui.h

@@ -10,6 +10,7 @@ struct uiAreaHandler {
 	void (*Draw)(uiAreaHandler *, uiArea *, uiAreaDrawParams *);
 	uintmax_t (*HScrollMax)(uiAreaHandler *, uiArea *);
 	uintmax_t (*VScrollMax)(uiAreaHandler *, uiArea *);
+	int (*RedrawOnResize)(uiAreaHandler *, uiArea *);
 };
 
 struct uiAreaDrawParams {