Remember exact window position (e.g. in which monitor it was closed)

It's working on alleg4 port on Windows only.

src/app/modules/gui.cpp

@@ -90,7 +90,8 @@ static ui::Timer* defered_invalid_timer = nullptr;
 static gfx::Region defered_invalid_region;
 
 // Load & save graphics configuration
-static void load_gui_config(int& w, int& h, bool& maximized);
+static void load_gui_config(int& w, int& h, bool& maximized,
+                            std::string& windowLayout);
 static void save_gui_config();
 
 static int get_screen_scale()
@@ -106,7 +107,8 @@ static bool create_main_display(bool gpuAccel,
 {
   int w, h;
   int scale = get_screen_scale();
-  load_gui_config(w, h, maximized);
+  std::string windowLayout;
+  load_gui_config(w, h, maximized, windowLayout);
 
   she::instance()->setGpuAcceleration(gpuAccel);
 
@@ -136,6 +138,9 @@ static bool create_main_display(bool gpuAccel,
     }
   }
 
+  if (main_display && !windowLayout.empty())
+    main_display->setLayout(windowLayout);
+
   return (main_display != nullptr);
 }
 
@@ -201,11 +206,13 @@ void exit_module_gui()
   main_display->dispose();
 }
 
-static void load_gui_config(int& w, int& h, bool& maximized)
+static void load_gui_config(int& w, int& h, bool& maximized,
+                            std::string& windowLayout)
 {
   w = get_config_int("GfxMode", "Width", 0);
   h = get_config_int("GfxMode", "Height", 0);
   maximized = get_config_bool("GfxMode", "Maximized", false);
+  windowLayout = get_config_string("GfxMode", "WindowLayout", "");
 }
 
 static void save_gui_config()
@@ -215,6 +222,10 @@ static void save_gui_config()
     set_config_bool("GfxMode", "Maximized", display->isMaximized());
     set_config_int("GfxMode", "Width", display->originalWidth());
     set_config_int("GfxMode", "Height", display->originalHeight());
+
+    std::string windowLayout = display->getLayout();
+    if (!windowLayout.empty())
+      set_config_string("GfxMode", "WindowLayout", windowLayout.c_str());
   }
 }
 

src/she/alleg4/alleg_display.cpp

@@ -24,9 +24,7 @@
 
 #ifdef _WIN32
   #include <winalleg.h>
-
   #include <windowsx.h>
-
   #include <commctrl.h>
 
   #if defined STRICT || defined __GNUC__
@@ -53,6 +51,7 @@
 
 #include <cassert>
 #include <list>
+#include <sstream>
 #include <vector>
 
 #include "she/alleg4/clock.h"
@@ -594,6 +593,63 @@ void Alleg4Display::releaseMouse()
 #endif
 }
 
+std::string Alleg4Display::getLayout()
+{
+#ifdef _WIN32
+  WINDOWPLACEMENT wp;
+  wp.length = sizeof(WINDOWPLACEMENT);
+  if (GetWindowPlacement((HWND)nativeHandle(), &wp)) {
+    std::ostringstream s;
+    s << 1 << ' '
+      << wp.flags << ' '
+      << wp.showCmd << ' '
+      << wp.ptMinPosition.x << ' '
+      << wp.ptMinPosition.y << ' '
+      << wp.ptMaxPosition.x << ' '
+      << wp.ptMaxPosition.y << ' '
+      << wp.rcNormalPosition.left << ' '
+      << wp.rcNormalPosition.top << ' '
+      << wp.rcNormalPosition.right << ' '
+      << wp.rcNormalPosition.bottom;
+    return s.str();
+  }
+#endif
+  return "";
+}
+
+void Alleg4Display::setLayout(const std::string& layout)
+{
+#ifdef _WIN32
+
+  WINDOWPLACEMENT wp;
+  wp.length = sizeof(WINDOWPLACEMENT);
+
+  std::istringstream s(layout);
+  int ver;
+  s >> ver;
+  if (ver == 1) {
+    s >> wp.flags
+      >> wp.showCmd
+      >> wp.ptMinPosition.x
+      >> wp.ptMinPosition.y
+      >> wp.ptMaxPosition.x
+      >> wp.ptMaxPosition.y
+      >> wp.rcNormalPosition.left
+      >> wp.rcNormalPosition.top
+      >> wp.rcNormalPosition.right
+      >> wp.rcNormalPosition.bottom;
+  }
+  else
+    return;
+
+  if (SetWindowPlacement((HWND)nativeHandle(), &wp)) {
+    // TODO use the return value
+  }
+#else
+  // Do nothing
+#endif
+}
+
 void* Alleg4Display::nativeHandle()
 {
 #ifdef _WIN32

src/she/alleg4/alleg_display.h

@@ -37,6 +37,8 @@ namespace she {
     void setMousePosition(const gfx::Point& position) override;
     void captureMouse() override;
     void releaseMouse() override;
+    std::string getLayout() override;
+    void setLayout(const std::string& layout) override;
     void* nativeHandle() override;
 
   private:

src/she/display.h

@@ -62,6 +62,11 @@ namespace she {
     virtual void captureMouse() = 0;
     virtual void releaseMouse() = 0;
 
+    // Set/get the specific information to restore the exact same
+    // window position (e.g. in the same monitor).
+    virtual std::string getLayout() = 0;
+    virtual void setLayout(const std::string& layout) = 0;
+
     // Returns the HWND on Windows.
     virtual DisplayHandle nativeHandle() = 0;
   };