Merge pull request #3 from andlabs/master

Merge upstream changes

README.md

@@ -16,10 +16,14 @@ This README is being written.<br>
 
 ## Updates
 
-*Note that today's entry may be updated later today Eastern Time.*
+*Note that today's entry (Eastern Time) may be updated later today.*
+
+* **16 June 2016**
+	* Added `uiWindowContentSize()`, `uiWindowSetContentSize()`, and `uiWindowOnContentSizeChanged()` methods for manipulating uiWindow content sizes. Note the use of "content size"; the size you work with does NOT include window decorations (titlebars, menus, etc.).
 
 * **15 June 2016**
 	* Added `uiFormDelete()`; thanks to @emersion.
+	* Added `uiWindowPosition()`, `uiWindowSetPosition()`, `uiWindowCenter()`, and `uiWindowOnPositionChanged()`, methods for manipulating uiWindow position.
 
 * **14 June 2016**
 	* uiDarwinControl now has a `ChildVisibilityChanged()` method and a corresponding `NotifyVisibilityChanged()` function that is called by the default show/hide handlers. This is used to make visibility changes work on OS X; uiBox, uiForm, and uiGrid all respect these now.

darwin/window.m

@@ -9,12 +9,20 @@ struct uiWindow {
 	int (*onClosing)(uiWindow *, void *);
 	void *onClosingData;
 	struct singleChildConstraints constraints;
+	void (*onPositionChanged)(uiWindow *, void *);
+	void *onPositionChangedData;
+	BOOL suppressPositionChanged;
+	void (*onContentSizeChanged)(uiWindow *, void *);
+	void *onContentSizeChangedData;
+	BOOL suppressSizeChanged;
 };
 
 @interface windowDelegateClass : NSObject<NSWindowDelegate> {
 	struct mapTable *windows;
 }
 - (BOOL)windowShouldClose:(id)sender;
+- (void)windowDidMove:(NSNotification *)note;
+- (void)windowDidResize:(NSNotification *)note;
 - (void)registerWindow:(uiWindow *)w;
 - (void)unregisterWindow:(uiWindow *)w;
 - (uiWindow *)lookupWindow:(NSWindow *)w;
@@ -47,6 +55,25 @@ struct uiWindow {
 	return NO;
 }
 
+// TODO doesn't happen live
+- (void)windowDidMove:(NSNotification *)note
+{
+	uiWindow *w;
+
+	w = [self lookupWindow:((NSWindow *) [note object])];
+	if (!w->suppressPositionChanged)
+		(*(w->onPositionChanged))(w, w->onPositionChangedData);
+}
+
+- (void)windowDidResize:(NSNotification *)note
+{
+	uiWindow *w;
+
+	w = [self lookupWindow:((NSWindow *) [note object])];
+	if (!w->suppressSizeChanged)
+		(*(w->onContentSizeChanged))(w, w->onContentSizeChangedData);
+}
+
 - (void)registerWindow:(uiWindow *)w
 {
 	mapSet(self->windows, w->window, w);
@@ -204,6 +231,71 @@ void uiWindowSetTitle(uiWindow *w, const char *title)
 	[w->window setTitle:toNSString(title)];
 }
 
+void uiWindowPosition(uiWindow *w, int *x, int *y)
+{
+	NSScreen *screen;
+	NSRect r;
+
+	r = [w->window frame];
+	*x = r.origin.x;
+	// this is the right screen to use; thanks mikeash in irc.freenode.net/#macdev
+	// -mainScreen is useless for positioning (it's just the key window's screen)
+	// and we use -frame, not -visibleFrame, for dealing with absolute positions
+	screen = (NSScreen *) [[NSScreen screens] objectAtIndex:0];
+	*y = ([screen frame].size.height - r.origin.y) - r.size.height;
+}
+
+void uiWindowSetPosition(uiWindow *w, int x, int y)
+{
+	// -[NSWindow setFrameTopLeftPoint:] is acting weird so...
+	NSRect r;
+	NSScreen *screen;
+
+	// this fires windowDidMove:
+	w->suppressPositionChanged = YES;
+	r = [w->window frame];
+	r.origin.x = x;
+	screen = (NSScreen *) [[NSScreen screens] objectAtIndex:0];
+	r.origin.y = [screen frame].size.height - (y + r.size.height);
+	[w->window setFrameOrigin:r.origin];
+	w->suppressPositionChanged = NO;
+}
+
+void uiWindowCenter(uiWindow *w)
+{
+	w->suppressPositionChanged = YES;
+	[w->window center];
+	w->suppressPositionChanged = NO;
+}
+
+void uiWindowOnPositionChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data)
+{
+	w->onPositionChanged = f;
+	w->onPositionChangedData = data;
+}
+
+void uiWindowContentSize(uiWindow *w, int *width, int *height)
+{
+	NSRect r;
+
+	r = [w->window contentRectForFrameRect:[w->window frame]];
+	*width = r.size.width;
+	*height = r.size.height;
+}
+
+void uiWindowSetContentSize(uiWindow *w, int width, int height)
+{
+	w->suppressSizeChanged = YES;
+	[w->window setContentSize:NSMakeSize(width, height)];
+	w->suppressSizeChanged = NO;
+}
+
+void uiWindowOnContentSizeChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data)
+{
+	w->onContentSizeChanged = f;
+	w->onContentSizeChangedData = data;
+}
+
 void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *, void *), void *data)
 {
 	w->onClosing = f;
@@ -245,6 +337,11 @@ static int defaultOnClosing(uiWindow *w, void *data)
 	return 0;
 }
 
+static void defaultOnPositionContentSizeChanged(uiWindow *w, void *data)
+{
+	// do nothing
+}
+
 uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 {
 	uiWindow *w;
@@ -269,6 +366,8 @@ uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 	}
 	[windowDelegate registerWindow:w];
 	uiWindowOnClosing(w, defaultOnClosing, NULL);
+	uiWindowOnPositionChanged(w, defaultOnPositionContentSizeChanged, NULL);
+	uiWindowOnContentSizeChanged(w, defaultOnPositionContentSizeChanged, NULL);
 
 	return w;
 }

doc/windowmovesize

@@ -0,0 +1,3 @@
+you should never need to use these functions
+they are provided only for the cases when ABSOLUTELY NECESSARY
+the operating system may ignore your requests, for instance, if you are giving it invalid numbers or a size too small to fit; this is all system-defined

test/CMakeLists.txt

@@ -25,6 +25,7 @@ _add_exec(tester
 	page12.c
 	page13.c
 	page14.c
+	page15.c
 	spaced.c
 	${_TEST_RESOURCES_RC}
 )

test/main.c

@@ -49,6 +49,7 @@ int main(int argc, char *argv[])
 	uiBox *page6, *page7, *page8, *page9, *page10;
 	uiBox *page11, *page12, *page13;
 	uiTab *page14;
+	uiBox *page15;
 	uiTab *outerTab;
 	uiTab *innerTab;
 	int nomenus = 0;
@@ -148,6 +149,9 @@ int main(int argc, char *argv[])
 	page14 = makePage14();
 	uiTabAppend(innerTab, "Page 14", uiControl(page14));
 
+	page15 = makePage15(w);
+	uiTabAppend(innerTab, "Page 15", uiControl(page15));
+
 	if (startspaced)
 		setSpaced(1);
 

test/page15.c

@@ -0,0 +1,129 @@
+// 15 june 2016
+#include "test.h"
+
+static uiSpinbox *x, *y;
+static uiSpinbox *width, *height;
+
+static void moveX(uiSpinbox *s, void *data)
+{
+	uiWindow *w = uiWindow(data);
+	int xp, yp;
+
+	uiWindowPosition(w, &xp, &yp);
+	xp = uiSpinboxValue(x);
+	uiWindowSetPosition(w, xp, yp);
+}
+
+static void moveY(uiSpinbox *s, void *data)
+{
+	uiWindow *w = uiWindow(data);
+	int xp, yp;
+
+	uiWindowPosition(w, &xp, &yp);
+	yp = uiSpinboxValue(y);
+	uiWindowSetPosition(w, xp, yp);
+}
+
+static void updatepos(uiWindow *w)
+{
+	int xp, yp;
+
+	uiWindowPosition(w, &xp, &yp);
+	uiSpinboxSetValue(x, xp);
+	uiSpinboxSetValue(y, yp);
+}
+
+static void center(uiButton *b, void *data)
+{
+	uiWindow *w = uiWindow(data);
+
+	uiWindowCenter(w);
+	updatepos(w);
+}
+
+void onMove(uiWindow *w, void *data)
+{
+	printf("move\n");
+	updatepos(w);
+}
+
+static void sizeWidth(uiSpinbox *s, void *data)
+{
+	uiWindow *w = uiWindow(data);
+	int xp, yp;
+
+	uiWindowContentSize(w, &xp, &yp);
+	xp = uiSpinboxValue(width);
+	uiWindowSetContentSize(w, xp, yp);
+}
+
+static void sizeHeight(uiSpinbox *s, void *data)
+{
+	uiWindow *w = uiWindow(data);
+	int xp, yp;
+
+	uiWindowContentSize(w, &xp, &yp);
+	yp = uiSpinboxValue(height);
+	uiWindowSetContentSize(w, xp, yp);
+}
+
+static void updatesize(uiWindow *w)
+{
+	int xp, yp;
+
+	uiWindowContentSize(w, &xp, &yp);
+	uiSpinboxSetValue(width, xp);
+	uiSpinboxSetValue(height, yp);
+}
+
+void onSize(uiWindow *w, void *data)
+{
+	printf("size\n");
+	updatesize(w);
+}
+
+uiBox *makePage15(uiWindow *w)
+{
+	uiBox *page15;
+	uiBox *hbox;
+	uiButton *button;
+
+	page15 = newVerticalBox();
+
+	hbox = newHorizontalBox();
+	// TODO if I make this 1 and not add anything else AND not call uiWindowOnPositionChanged(), on OS X the box won't be able to grow vertically
+	uiBoxAppend(page15, uiControl(hbox), 0);
+
+	uiBoxAppend(hbox, uiControl(uiNewLabel("Position")), 0);
+	x = uiNewSpinbox(INT_MIN, INT_MAX);
+	uiBoxAppend(hbox, uiControl(x), 1);
+	y = uiNewSpinbox(INT_MIN, INT_MAX);
+	uiBoxAppend(hbox, uiControl(y), 1);
+	button = uiNewButton("Center");
+	uiBoxAppend(hbox, uiControl(button), 0);
+
+	uiSpinboxOnChanged(x, moveX, w);
+	uiSpinboxOnChanged(y, moveY, w);
+	uiButtonOnClicked(button, center, w);
+	uiWindowOnPositionChanged(w, onMove, NULL);
+	updatepos(w);
+
+	hbox = newHorizontalBox();
+	uiBoxAppend(page15, uiControl(hbox), 0);
+
+	uiBoxAppend(hbox, uiControl(uiNewLabel("Size")), 0);
+	width = uiNewSpinbox(INT_MIN, INT_MAX);
+	uiBoxAppend(hbox, uiControl(width), 1);
+	height = uiNewSpinbox(INT_MIN, INT_MAX);
+	uiBoxAppend(hbox, uiControl(height), 1);
+//	button = uiNewButton("Center");
+//	uiBoxAppend(hbox, uiControl(button), 0);
+
+	uiSpinboxOnChanged(width, sizeWidth, w);
+	uiSpinboxOnChanged(height, sizeHeight, w);
+//	uiButtonOnClicked(button, center, w);
+	uiWindowOnContentSizeChanged(w, onSize, NULL);
+	updatesize(w);
+
+	return page15;
+}

test/test.h

@@ -5,6 +5,7 @@
 #include <stdarg.h>
 #include <string.h>
 #include <math.h>
+#include <limits.h>
 #include "../ui.h"
 
 // main.c
@@ -85,3 +86,6 @@ extern uiBox *makePage13(void);
 
 // page14.c
 extern uiTab *makePage14(void);
+
+// page15.c
+extern uiBox *makePage15(uiWindow *);

ui.h

@@ -99,6 +99,13 @@ typedef struct uiWindow uiWindow;
 #define uiWindow(this) ((uiWindow *) (this))
 _UI_EXTERN char *uiWindowTitle(uiWindow *w);
 _UI_EXTERN void uiWindowSetTitle(uiWindow *w, const char *title);
+_UI_EXTERN void uiWindowPosition(uiWindow *w, int *x, int *y);
+_UI_EXTERN void uiWindowSetPosition(uiWindow *w, int x, int y);
+_UI_EXTERN void uiWindowCenter(uiWindow *w);
+_UI_EXTERN void uiWindowOnPositionChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data);
+_UI_EXTERN void uiWindowContentSize(uiWindow *w, int *width, int *height);
+_UI_EXTERN void uiWindowSetContentSize(uiWindow *w, int width, int height);
+_UI_EXTERN void uiWindowOnContentSizeChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data);
 _UI_EXTERN void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *w, void *data), void *data);
 _UI_EXTERN void uiWindowSetChild(uiWindow *w, uiControl *child);
 _UI_EXTERN int uiWindowMargined(uiWindow *w);

unix/window.c

@@ -12,13 +12,22 @@ struct uiWindow {
 	GtkContainer *vboxContainer;
 	GtkBox *vbox;
 
+	GtkWidget *childHolderWidget;
+	GtkContainer *childHolderContainer;
+
 	GtkWidget *menubar;
 
-	struct child *child;
+	uiControl *child;
 	int margined;
 
 	int (*onClosing)(uiWindow *, void *);
 	void *onClosingData;
+	void (*onPositionChanged)(uiWindow *, void *);
+	void *onPositionChangedData;
+	gboolean changingPosition;
+	void (*onContentSizeChanged)(uiWindow *, void *);
+	void *onContentSizeChangedData;
+	gboolean changingSize;
 };
 
 static gboolean onClosing(GtkWidget *win, GdkEvent *e, gpointer data)
@@ -32,11 +41,39 @@ static gboolean onClosing(GtkWidget *win, GdkEvent *e, gpointer data)
 	return TRUE;
 }
 
+static gboolean onConfigure(GtkWidget *win, GdkEvent *e, gpointer data)
+{
+	uiWindow *w = uiWindow(data);
+
+	// there doesn't seem to be a way to determine if only moving or only resizing is happening :/
+	if (w->changingPosition)
+		w->changingPosition = FALSE;
+	else
+		(*(w->onPositionChanged))(w, w->onPositionChangedData);
+	// always continue handling
+	return FALSE;
+}
+
+static void onSizeAllocate(GtkWidget *widget, GdkRectangle *allocation, gpointer data)
+{
+	uiWindow *w = uiWindow(data);
+
+	if (w->changingSize)
+		w->changingSize = FALSE;
+	else
+		(*(w->onContentSizeChanged))(w, w->onContentSizeChangedData);
+}
+
 static int defaultOnClosing(uiWindow *w, void *data)
 {
 	return 0;
 }
 
+static void defaultOnPositionContentSizeChanged(uiWindow *w, void *data)
+{
+	// do nothing
+}
+
 static void uiWindowDestroy(uiControl *c)
 {
 	uiWindow *w = uiWindow(c);
@@ -44,11 +81,15 @@ static void uiWindowDestroy(uiControl *c)
 	// first hide ourselves
 	gtk_widget_hide(w->widget);
 	// now destroy the child
-	if (w->child != NULL)
-		childDestroy(w->child);
+	if (w->child != NULL) {
+		uiControlSetParent(w->child, NULL);
+		uiUnixControlSetContainer(uiUnixControl(w->child), w->childHolderContainer, TRUE);
+		uiControlDestroy(w->child);
+	}
 	// now destroy the menus, if any
 	if (w->menubar != NULL)
 		freeMenubar(w->menubar);
+	gtk_widget_destroy(w->childHolderWidget);
 	gtk_widget_destroy(w->vboxWidget);
 	// and finally free ourselves
 	g_object_unref(w->widget);
@@ -101,22 +142,99 @@ void uiWindowSetTitle(uiWindow *w, const char *title)
 	gtk_window_set_title(w->window, title);
 }
 
+// TODO allow specifying either as NULL on all platforms
+void uiWindowPosition(uiWindow *w, int *x, int *y)
+{
+	gint rx, ry;
+
+	gtk_window_get_position(w->window, &rx, &ry);
+	*x = rx;
+	*y = ry;
+}
+
+void uiWindowSetPosition(uiWindow *w, int x, int y)
+{
+	w->changingPosition = TRUE;
+	gtk_window_move(w->window, x, y);
+	// gtk_window_move() is asynchronous
+	// we need to wait for a configure-event
+	// thanks to hergertme in irc.gimp.net/#gtk+
+	while (w->changingPosition)
+		if (gtk_main_iteration() != FALSE)
+			break;		// stop early if gtk_main_quit() called
+}
+
+void uiWindowCenter(uiWindow *w)
+{
+	gint x, y;
+	GtkAllocation winalloc;
+	GdkWindow *gdkwin;
+	GdkScreen *screen;
+	GdkRectangle workarea;
+
+	gtk_widget_get_allocation(w->widget, &winalloc);
+	gdkwin = gtk_widget_get_window(w->widget);
+	screen = gdk_window_get_screen(gdkwin);
+	gdk_screen_get_monitor_workarea(screen,
+		gdk_screen_get_monitor_at_window(screen, gdkwin),
+		&workarea);
+
+	x = (workarea.width - winalloc.width) / 2;
+	y = (workarea.height - winalloc.height) / 2;
+	// TODO move up slightly? see what Mutter or GNOME Shell or GNOME Terminal do(es)?
+	uiWindowSetPosition(w, x, y);
+}
+
+void uiWindowOnPositionChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data)
+{
+	w->onPositionChanged = f;
+	w->onPositionChangedData = data;
+}
+
+void uiWindowContentSize(uiWindow *w, int *width, int *height)
+{
+	GtkAllocation allocation;
+
+	gtk_widget_get_allocation(w->childHolderWidget, &allocation);
+	*width = allocation.width;
+	*height = allocation.height;
+}
+
+// TODO what happens if the size is already the current one?
+// TODO a spurious size-allocate gets sent after this function returns
+void uiWindowSetContentSize(uiWindow *w, int width, int height)
+{
+	w->changingSize = TRUE;
+	gtk_widget_set_size_request(w->childHolderWidget, width, height);
+	while (w->changingSize)
+		if (gtk_main_iteration() != FALSE)
+			break;			// stop early if gtk_main_quit() called
+	gtk_widget_set_size_request(w->childHolderWidget, -1, -1);
+}
+
+void uiWindowOnContentSizeChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data)
+{
+	w->onContentSizeChanged = f;
+	w->onContentSizeChangedData = data;
+}
+
 void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *, void *), void *data)
 {
 	w->onClosing = f;
 	w->onClosingData = data;
 }
 
+// TODO save and restore expands and aligns
 void uiWindowSetChild(uiWindow *w, uiControl *child)
 {
-	if (w->child != NULL)
-		childRemove(w->child);
-	w->child = newChildWithBox(child, uiControl(w), w->vboxContainer, w->margined);
 	if (w->child != NULL) {
-		gtk_widget_set_hexpand(childBox(w->child), TRUE);
-		gtk_widget_set_halign(childBox(w->child), GTK_ALIGN_FILL);
-		gtk_widget_set_vexpand(childBox(w->child), TRUE);
-		gtk_widget_set_valign(childBox(w->child), GTK_ALIGN_FILL);
+		uiControlSetParent(w->child, NULL);
+		uiUnixControlSetContainer(uiUnixControl(w->child), w->childHolderContainer, TRUE);
+	}
+	w->child = child;
+	if (w->child != NULL) {
+		uiControlSetParent(w->child, uiControl(w));
+		uiUnixControlSetContainer(uiUnixControl(w->child), w->childHolderContainer, FALSE);
 	}
 }
 
@@ -128,8 +246,7 @@ int uiWindowMargined(uiWindow *w)
 void uiWindowSetMargined(uiWindow *w, int margined)
 {
 	w->margined = margined;
-	if (w->child != NULL)
-		childSetMargined(w->child, w->margined);
+	setMargined(w->childHolderContainer, w->margined);
 }
 
 uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
@@ -157,12 +274,24 @@ uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 		gtk_container_add(w->vboxContainer, w->menubar);
 	}
 
+	w->childHolderWidget = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
+	w->childHolderContainer = GTK_CONTAINER(w->childHolderWidget);
+	gtk_widget_set_hexpand(w->childHolderWidget, TRUE);
+	gtk_widget_set_halign(w->childHolderWidget, GTK_ALIGN_FILL);
+	gtk_widget_set_vexpand(w->childHolderWidget, TRUE);
+	gtk_widget_set_valign(w->childHolderWidget, GTK_ALIGN_FILL);
+	gtk_container_add(w->vboxContainer, w->childHolderWidget);
+
 	// show everything in the vbox, but not the GtkWindow itself
 	gtk_widget_show_all(w->vboxWidget);
 
-	// and connect our OnClosing() event
+	// and connect our events
 	g_signal_connect(w->widget, "delete-event", G_CALLBACK(onClosing), w);
+	g_signal_connect(w->widget, "configure-event", G_CALLBACK(onConfigure), w);
+	g_signal_connect(w->childHolderWidget, "size-allocate", G_CALLBACK(onSizeAllocate), w);
 	uiWindowOnClosing(w, defaultOnClosing, NULL);
+	uiWindowOnPositionChanged(w, defaultOnPositionContentSizeChanged, NULL);
+	uiWindowOnContentSizeChanged(w, defaultOnPositionContentSizeChanged, NULL);
 
 	// normally it's SetParent() that does this, but we can't call SetParent() on a uiWindow
 	// TODO we really need to clean this up

windows/window.cpp

@@ -14,6 +14,12 @@ struct uiWindow {
 	void *onClosingData;
 	int margined;
 	BOOL hasMenubar;
+	void (*onPositionChanged)(uiWindow *, void *);
+	void *onPositionChangedData;
+	BOOL changingPosition;		// to avoid triggering the above when programmatically doing this
+	void (*onContentSizeChanged)(uiWindow *, void *);
+	void *onContentSizeChangedData;
+	BOOL changingSize;
 };
 
 // from https://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
@@ -35,7 +41,6 @@ static void windowMargins(uiWindow *w, int *mx, int *my)
 
 static void windowRelayout(uiWindow *w)
 {
-	uiWindowsSizing sizing;
 	int x, y, width, height;
 	RECT r;
 	int mx, my;
@@ -87,8 +92,15 @@ static LRESULT CALLBACK windowWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARA
 		runMenuEvent(LOWORD(wParam), uiWindow(w));
 		return 0;
 	case WM_WINDOWPOSCHANGED:
+		if ((wp->flags & SWP_NOMOVE) == 0)
+			if (!w->changingPosition)
+				(*(w->onPositionChanged))(w, w->onPositionChangedData);
+			// and continue anyway
 		if ((wp->flags & SWP_NOSIZE) != 0)
 			break;
+		if (w->onContentSizeChanged != NULL)		// TODO figure out why this is happening too early
+			if (!w->changingSize)
+				(*(w->onContentSizeChanged))(w, w->onContentSizeChangedData);
 		windowRelayout(w);
 		return 0;
 	case WM_GETMINMAXINFO:
@@ -138,6 +150,11 @@ static int defaultOnClosing(uiWindow *w, void *data)
 	return 0;
 }
 
+static void defaultOnPositionContentSizeChanged(uiWindow *w, void *data)
+{
+	// do nothing
+}
+
 static std::map<uiWindow *, bool> windows;
 
 static void uiWindowDestroy(uiControl *c)
@@ -224,7 +241,6 @@ uiWindowsControlDefaultSetParentHWND(uiWindow)
 static void uiWindowMinimumSize(uiWindowsControl *c, int *width, int *height)
 {
 	uiWindow *w = uiWindow(c);
-	uiWindowsSizing sizing;
 	int mx, my;
 
 	*width = 0;
@@ -277,6 +293,100 @@ void uiWindowSetTitle(uiWindow *w, const char *title)
 	// don't queue resize; the caption isn't part of what affects layout and sizing of the client area (it'll be ellipsized if too long)
 }
 
+void uiWindowPosition(uiWindow *w, int *x, int *y)
+{
+	RECT r;
+
+	uiWindowsEnsureGetWindowRect(w->hwnd, &r);
+	*x = r.left;
+	*y = r.top;
+}
+
+void uiWindowSetPosition(uiWindow *w, int x, int y)
+{
+	w->changingPosition = TRUE;
+	if (SetWindowPos(w->hwnd, NULL, x, y, 0, 0, SWP_NOACTIVATE | SWP_NOOWNERZORDER | SWP_NOSIZE | SWP_NOZORDER) == 0)
+		logLastError(L"error moving window");
+	w->changingPosition = FALSE;
+}
+
+// this is used for both fullscreening and centering
+// see also https://blogs.msdn.microsoft.com/oldnewthing/20100412-00/?p=14353 and https://blogs.msdn.microsoft.com/oldnewthing/20050505-04/?p=35703
+static void windowMonitorRect(HWND hwnd, RECT *r)
+{
+	HMONITOR monitor;
+	MONITORINFO mi;
+
+	monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTOPRIMARY);
+	ZeroMemory(&mi, sizeof (MONITORINFO));
+	mi.cbSize = sizeof (MONITORINFO);
+	if (GetMonitorInfoW(monitor, &mi) == 0) {
+		logLastError(L"error getting window monitor rect");
+		// default to SM_CXSCREEN x SM_CYSCREEN to be safe
+		r->left = 0;
+		r->top = 0;
+		r->right = GetSystemMetrics(SM_CXSCREEN);
+		r->bottom = GetSystemMetrics(SM_CYSCREEN);
+		return;
+	}
+	*r = mi.rcMonitor;
+}
+
+// TODO use the work rect instead?
+void uiWindowCenter(uiWindow *w)
+{
+	RECT wr, mr;
+	int x, y;
+	LONG wwid, mwid;
+	LONG wht, mht;
+
+	uiWindowsEnsureGetWindowRect(w->hwnd, &wr);
+	windowMonitorRect(w->hwnd, &mr);
+	wwid = wr.right - wr.left;
+	mwid = mr.right - mr.left;
+	x = (mwid - wwid) / 2;
+	wht = wr.bottom - wr.top;
+	mht = mr.bottom - mr.top;
+	y = (mht - wht) / 2;
+	// y is now evenly divided, however https://msdn.microsoft.com/en-us/library/windows/desktop/dn742502(v=vs.85).aspx says that 45% should go above and 55% should go below
+	// so just move 5% of the way up
+	// TODO should this be on the work area?
+	// TODO is this calculation correct?
+	y -= y / 20;
+	uiWindowSetPosition(w, x, y);
+}
+
+void uiWindowContentSize(uiWindow *w, int *width, int *height)
+{
+	RECT r;
+
+	uiWindowsEnsureGetClientRect(w->hwnd, &r);
+	*width = r.right - r.left;
+	*height = r.bottom - r.top;
+}
+
+// TODO should this disallow too small?
+void uiWindowSetContentSize(uiWindow *w, int width, int height)
+{
+	w->changingSize = TRUE;
+	clientSizeToWindowSize(w->hwnd, &width, &height, w->hasMenubar);
+	if (SetWindowPos(w->hwnd, NULL, 0, 0, width, height, SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOOWNERZORDER | SWP_NOZORDER) == 0)
+		logLastError(L"error resizing window");
+	w->changingSize = FALSE;
+}
+
+void uiWindowOnContentSizeChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data)
+{
+	w->onContentSizeChanged = f;
+	w->onContentSizeChangedData = data;
+}
+
+void uiWindowOnPositionChanged(uiWindow *w, void (*f)(uiWindow *, void *), void *data)
+{
+	w->onPositionChanged = f;
+	w->onPositionChangedData = data;
+}
+
 void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *, void *), void *data)
 {
 	w->onClosing = f;
@@ -373,6 +483,8 @@ uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 	setClientSize(w, width, height, hasMenubarBOOL, style, exstyle);
 
 	uiWindowOnClosing(w, defaultOnClosing, NULL);
+	uiWindowOnPositionChanged(w, defaultOnPositionContentSizeChanged, NULL);
+	uiWindowOnContentSizeChanged(w, defaultOnPositionContentSizeChanged, NULL);
 
 	windows[w] = true;
 	return w;