Implement puglSetTransientFor() for Mac and Windows

4 files changed, 41 insertions, 1 deletions

diff --git a/pugl/detail/mac.m b/pugl/detail/mac.m
index 501be02..480253e 100644
--- a/pugl/detail/mac.m
+++ b/pugl/detail/mac.m
@@ -1154,6 +1154,23 @@ puglSetAspectRatio(PuglView* const view,
 	return PUGL_SUCCESS;
 }
 
+PuglStatus
+puglSetTransientFor(PuglView* view, PuglNativeView parent)
+{
+	view->transientParent = parent;
+
+	if (view->impl->window) {
+		NSWindow* parentWindow = [(NSView*)parent window];
+		if (parentWindow) {
+			[parentWindow addChildWindow:view->impl->window
+			                     ordered:NSWindowAbove];
+			return PUGL_SUCCESS;
+		}
+	}
+
+	return PUGL_FAILURE;
+}
+
 const void*
 puglGetClipboard(PuglView* const    view,
                  const char** const type,
diff --git a/pugl/detail/win.c b/pugl/detail/win.c
index 44ba6cd..cb9a69c 100644
--- a/pugl/detail/win.c
+++ b/pugl/detail/win.c
@@ -979,6 +979,23 @@ puglSetAspectRatio(PuglView* const view,
 	return PUGL_SUCCESS;
 }
 
+PuglStatus
+puglSetTransientFor(PuglView* view, PuglNativeView parent)
+{
+	if (view->parent) {
+		return PUGL_FAILURE;
+	}
+
+	view->transientParent = parent;
+
+	if (view->impl->hwnd) {
+		SetWindowLongPtr(view->impl->hwnd, GWLP_HWNDPARENT, (LONG_PTR)parent);
+		return GetLastError() == NO_ERROR ? PUGL_SUCCESS : PUGL_FAILURE;
+	}
+
+	return PUGL_SUCCESS;
+}
+
 const void*
 puglGetClipboard(PuglView* const    view,
                  const char** const type,
diff --git a/pugl/detail/win.h b/pugl/detail/win.h
index 949fa90..241ea24 100644
--- a/pugl/detail/win.h
+++ b/pugl/detail/win.h
@@ -96,6 +96,9 @@ puglWinCreateWindow(const PuglView* const view,
 	const unsigned winFlags   = puglWinGetWindowFlags(view);
 	const unsigned winExFlags = puglWinGetWindowExFlags(view);
 
+	// The meaning of "parent" depends on the window type (WS_CHILD)
+	PuglNativeView parent = view->parent ? view->parent : view->transientParent;
+
 	// Calculate total window size to accommodate requested view size
 	RECT wr = { (long)view->frame.x, (long)view->frame.y,
 	            (long)view->frame.width, (long)view->frame.height };
@@ -105,7 +108,7 @@ puglWinCreateWindow(const PuglView* const view,
 	if (!(*hwnd = CreateWindowEx(winExFlags, className, title, winFlags,
 	                             CW_USEDEFAULT, CW_USEDEFAULT,
 	                             wr.right-wr.left, wr.bottom-wr.top,
-	                             (HWND)view->parent, NULL, NULL, NULL))) {
+	                             (HWND)parent, NULL, NULL, NULL))) {
 		return PUGL_REALIZE_FAILED;
 	} else if (!(*hdc = GetDC(*hwnd))) {
 		DestroyWindow(*hwnd);
diff --git a/pugl/pugl.h b/pugl/pugl.h
index fbdf5db..84bfa98 100644
--- a/pugl/pugl.h
+++ b/pugl/pugl.h
@@ -1001,6 +1001,9 @@ puglSetParentWindow(PuglView* view, PuglNativeView parent);
    Set this for transient children like dialogs, to have them properly
    associated with their parent window.  This should be called before
    puglRealize().
+
+   A view can either have a parent (for embedding) or a transient parent (for
+   top-level windows like dialogs), but not both.
 */
 PUGL_API PuglStatus
 puglSetTransientFor(PuglView* view, PuglNativeView parent);