From 2e07e028c1080051846b1b200493e528a8f9a5e6 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sun, 28 Sep 2014 22:00:30 +0200
Subject: Support minimum window size.

Conflicts:
	pugl/pugl_win.cpp
---
 pugl/pugl.h          |  6 ++++++
 pugl/pugl_internal.h |  9 +++++++++
 pugl/pugl_osx.m      |  3 +++
 pugl/pugl_win.cpp    | 17 +++++++++++++++--
 pugl/pugl_x11.c      |  5 +++++
 pugl_test.c          |  1 +
 6 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/pugl/pugl.h b/pugl/pugl.h
index 68ecc19..54b4c78 100644
--- a/pugl/pugl.h
+++ b/pugl/pugl.h
@@ -164,6 +164,12 @@ puglInitWindowParent(PuglView* view, PuglNativeWindow parent);
 PUGL_API void
 puglInitWindowSize(PuglView* view, int width, int height);
 
+/**
+   Set the minimum window size before creating a window.
+*/
+PUGL_API void
+puglInitWindowMinSize(PuglView* view, int width, int height);
+
 /**
    Enable or disable resizing before creating a window.
 */
diff --git a/pugl/pugl_internal.h b/pugl/pugl_internal.h
index 32d31bf..8a193d6 100644
--- a/pugl/pugl_internal.h
+++ b/pugl/pugl_internal.h
@@ -52,6 +52,8 @@ struct PuglViewImpl {
 
 	int      width;
 	int      height;
+	int      min_width;
+	int      min_height;
 	int      mods;
 	bool     mouse_in_view;
 	bool     ignoreKeyRepeat;
@@ -89,6 +91,13 @@ puglInitWindowSize(PuglView* view, int width, int height)
 	view->height = height;
 }
 
+void
+puglInitWindowMinSize(PuglView* view, int width, int height)
+{
+	view->min_width  = width;
+	view->min_height = height;
+}
+
 void
 puglInitWindowParent(PuglView* view, PuglNativeWindow parent)
 {
diff --git a/pugl/pugl_osx.m b/pugl/pugl_osx.m
index 464a8a2..3b62fae 100644
--- a/pugl/pugl_osx.m
+++ b/pugl/pugl_osx.m
@@ -459,6 +459,9 @@ puglCreateWindow(PuglView* view, const char* title)
 
 	[window setPuglview:view];
 	[window setTitle:titleString];
+	if (view->min_width || view->min_height) {
+		[window setContentMinSize:NSMakeSize(view->min_width, view->min_height)];
+	}
 
 	impl->glview           = [PuglOpenGLView new];
 	impl->window           = window;
diff --git a/pugl/pugl_win.cpp b/pugl/pugl_win.cpp
index ead0236..2040b98 100644
--- a/pugl/pugl_win.cpp
+++ b/pugl/pugl_win.cpp
@@ -128,9 +128,16 @@ puglCreateWindow(PuglView* view, const char* title)
 	int winFlags = WS_POPUPWINDOW | WS_CAPTION;
 	if (view->resizable) {
 		winFlags |= WS_SIZEBOX;
+		if (view->min_width || view->min_height) {
+			// Adjust the minimum window size to accomodate requested view size
+			RECT mr = { 0, 0, view->min_width, view->min_height };
+			AdjustWindowRectEx(&mr, winFlags, FALSE, WS_EX_TOPMOST);
+			view->min_width  = mr.right - mr.left;
+			view->min_height = wr.bottom - mr.top;
+		}
 	}
 
-	// Adjust the overall window size to accomodate our requested client size
+	// Adjust the window size to accomodate requested view size
 	RECT wr = { 0, 0, view->width, view->height };
 	AdjustWindowRectEx(&wr, winFlags, FALSE, WS_EX_TOPMOST);
 
@@ -305,18 +312,24 @@ handleMessage(PuglView* view, UINT message, WPARAM wParam, LPARAM lParam)
 {
 	PAINTSTRUCT ps;
 	PuglKey     key;
+	RECT        rect;
+	MINMAXINFO* mmi;
 
 	setModifiers(view);
 	switch (message) {
 	case WM_CREATE:
 	case WM_SHOWWINDOW:
 	case WM_SIZE:
-		RECT rect;
 		GetClientRect(view->impl->hwnd, &rect);
 		puglReshape(view, rect.right, rect.bottom);
 		view->width = rect.right;
 		view->height = rect.bottom;
 		break;
+	case WM_GETMINMAXINFO:
+		mmi = (MINMAXINFO*)lParam;
+		mmi->ptMinTrackSize.x = view->min_width;
+		mmi->ptMinTrackSize.y = view->min_height;
+		break;
 	case WM_PAINT:
 		BeginPaint(view->impl->hwnd, &ps);
 		puglDisplay(view);
diff --git a/pugl/pugl_x11.c b/pugl/pugl_x11.c
index e0852be..e3325cd 100644
--- a/pugl/pugl_x11.c
+++ b/pugl/pugl_x11.c
@@ -210,6 +210,11 @@ puglCreateWindow(PuglView* view, const char* title)
 		sizeHints.max_width  = view->width;
 		sizeHints.max_height = view->height;
 		XSetNormalHints(impl->display, impl->win, &sizeHints);
+	} else if (view->min_width || view->min_height) {
+		sizeHints.flags      = PMinSize;
+		sizeHints.min_width  = view->min_width;
+		sizeHints.min_height = view->min_height;
+		XSetNormalHints(impl->display, impl->win, &sizeHints);
 	}
 
 	if (title) {
diff --git a/pugl_test.c b/pugl_test.c
index aa7997d..9b942f4 100644
--- a/pugl_test.c
+++ b/pugl_test.c
@@ -170,6 +170,7 @@ main(int argc, char** argv)
 
 	PuglView* view = puglInit(NULL, NULL);
 	puglInitWindowSize(view, 512, 512);
+	puglInitWindowMinSize(view, 256, 256);
 	puglInitResizable(view, resizable);
 	
 	puglIgnoreKeyRepeat(view, ignoreKeyRepeat);
-- 
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