From 2497577c09b13a55430a95fcf311448fda11cae3 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Thu, 23 Mar 2017 20:56:21 +0100
Subject: Fix resize event in win32 backend.

---
 configure.ac                    |  2 +-
 plugin/Makefile.mingw32.in      |  2 +-
 plugingui/nativewindow_win32.cc | 53 ++++++++++++++++++++++++++++++++++++-----
 plugingui/nativewindow_win32.h  |  2 ++
 4 files changed, 51 insertions(+), 8 deletions(-)

diff --git a/configure.ac b/configure.ac
index a56fd39..070f380 100644
--- a/configure.ac
+++ b/configure.ac
@@ -164,7 +164,7 @@ AS_IF(
   [test "x$enable_gui" = "xwin32"],
   [AC_MSG_RESULT([Setting gui backend to Win32])
   GUI_CPPFLAGS="-DUI_WIN32"
-  GUI_LIBS="-lgdi32 -lsetupapi -lws2_32"],
+  GUI_LIBS="-lgdi32 -lsetupapi -lws2_32 -lcomctl32"],
 
   [test "x$enable_gui" = "xpugl"],
   [AC_MSG_RESULT([Setting gui backend to Pugl])
diff --git a/plugin/Makefile.mingw32.in b/plugin/Makefile.mingw32.in
index 575a8a2..cab3e0c 100644
--- a/plugin/Makefile.mingw32.in
+++ b/plugin/Makefile.mingw32.in
@@ -86,7 +86,7 @@ GUI_SRC = \
 	@top_srcdir@/plugingui/lodepng/lodepng.cpp
 
 GUI_CPPFLAGS=-I@top_srcdir@/plugingui/ -DUSE_THREAD @GUI_CPPFLAGS@
-GUI_LIBS=-lgdi32 -lsetupapi -lws2_32
+GUI_LIBS=@GUI_LIBS@
 
 DBG_SRC = \
 	@top_srcdir@/hugin/hugin.c \
diff --git a/plugingui/nativewindow_win32.cc b/plugingui/nativewindow_win32.cc
index 6297b23..80dcf7d 100644
--- a/plugingui/nativewindow_win32.cc
+++ b/plugingui/nativewindow_win32.cc
@@ -28,6 +28,7 @@
 
 #include <cstring>
 #include <algorithm>
+#include <commctrl.h>
 
 #include "window.h"
 
@@ -54,8 +55,8 @@ LRESULT CALLBACK NativeWindowWin32::dialogProc(HWND hwnd, UINT msg,
 			auto resizeEvent = std::make_shared<ResizeEvent>();
 			resizeEvent->width = LOWORD(lp);
 			resizeEvent->height = HIWORD(lp);
-			//native->event_queue.push_back(resizeEvent);
-			native->window.resized(resizeEvent->width, resizeEvent->height);
+			native->event_queue.push_back(resizeEvent);
+			//native->window.resized(resizeEvent->width, resizeEvent->height);
 		}
 		break;
 
@@ -296,6 +297,36 @@ LRESULT CALLBACK NativeWindowWin32::dialogProc(HWND hwnd, UINT msg,
 	return DefWindowProc(hwnd, msg, wp, lp);
 }
 
+LRESULT CALLBACK NativeWindowWin32::subClassProc(HWND hwnd, UINT msg,
+                                                 WPARAM wp, LPARAM lp,
+                                                 UINT_PTR id, DWORD_PTR data)
+{
+	NativeWindowWin32* native = (NativeWindowWin32*)data;
+
+	// NOTE: 'native' is nullptr intil the WM_CREATE message has been handled.
+	if(!native)
+	{
+		return DefWindowProc(hwnd, msg, wp, lp);
+	}
+
+	switch(msg) {
+	case WM_SIZE:
+		{
+			int width = LOWORD(lp);
+			int height = HIWORD(lp);
+			SetWindowPos(native->m_hwnd, nullptr, -1, -1, width, height, SWP_NOMOVE);
+			RECT rect;
+			GetClientRect(native->m_hwnd, &rect);
+			int w = width - rect.right;
+			int h = height - rect.bottom;
+			SetWindowPos(native->m_hwnd, nullptr, -1, -1, width + w, height + h, SWP_NOMOVE);
+		}
+		break;
+	}
+
+	return DefWindowProc(hwnd, msg, wp, lp);
+}
+
 NativeWindowWin32::NativeWindowWin32(void* native_window, Window& window)
 	: window(window)
 {
@@ -337,6 +368,12 @@ NativeWindowWin32::NativeWindowWin32(void* native_window, Window& window)
 	                        GetModuleHandle(nullptr), nullptr);
 
 	SetWindowLongPtr(m_hwnd, GWLP_USERDATA, (LONG_PTR)this);
+
+	if(parent_window)
+	{
+		// Listen in on parent size changes.
+		SetWindowSubclass(parent_window, subClassProc, 42, (LONG_PTR)this);
+	}
 }
 
 NativeWindowWin32::~NativeWindowWin32()
@@ -355,13 +392,17 @@ void NativeWindowWin32::setFixedSize(std::size_t width, std::size_t height)
 
 void NativeWindowWin32::resize(std::size_t width, std::size_t height)
 {
-	SetWindowPos(m_hwnd, nullptr, -1, -1, (int)width, (int)height, SWP_NOMOVE);
+	auto hwnd = m_hwnd;
+	if(parent_window)
+	{
+		hwnd = parent_window;
+	}
+	SetWindowPos(hwnd, nullptr, -1, -1, (int)width, (int)height, SWP_NOMOVE);
 	RECT rect;
-	GetClientRect(m_hwnd, &rect);
+	GetClientRect(hwnd, &rect);
 	int w = width - rect.right;
 	int h = height - rect.bottom;
-
-	SetWindowPos(m_hwnd, nullptr, -1, -1, width + w, height + h, SWP_NOMOVE);
+	SetWindowPos(hwnd, nullptr, -1, -1, width + w, height + h, SWP_NOMOVE);
 }
 
 std::pair<std::size_t, std::size_t> NativeWindowWin32::getSize()
diff --git a/plugingui/nativewindow_win32.h b/plugingui/nativewindow_win32.h
index 2299189..c7d412a 100644
--- a/plugingui/nativewindow_win32.h
+++ b/plugingui/nativewindow_win32.h
@@ -59,6 +59,8 @@ public:
 
 private:
 	static LRESULT CALLBACK dialogProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp);
+	static LRESULT CALLBACK subClassProc(HWND hwnd, UINT msg, WPARAM wp,
+	                                     LPARAM lp, UINT_PTR id, DWORD_PTR data);
 
 	HWND parent_window;
 	Window& window;
-- 
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