From 36d50301cfbf1b62d1eeda0ea4eebf894f0a25e1 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 6 Jun 2007 11:28:44 +0000
Subject: [PATCH] From Olaf Flebbe, "an implementation of
 GraphicsWindow::setCursor for WIN32."

---
 .../osgViewer/api/Win32/GraphicsWindowWin32   | 10 ++
 src/osgViewer/GraphicsWindowWin32.cpp         | 91 ++++++++++++++++++-
 2 files changed, 98 insertions(+), 3 deletions(-)

diff --git a/include/osgViewer/api/Win32/GraphicsWindowWin32 b/include/osgViewer/api/Win32/GraphicsWindowWin32
index 946045750..843c2e919 100644
--- a/include/osgViewer/api/Win32/GraphicsWindowWin32
+++ b/include/osgViewer/api/Win32/GraphicsWindowWin32
@@ -78,6 +78,9 @@ class GraphicsWindowWin32 : public osgViewer::GraphicsWindow
         /** Switch on/off the cursor.*/
         virtual void useCursor(bool /*cursorOn*/);
         
+        /** Set mouse cursor to a specific shape.*/
+        virtual void setCursor(MouseCursor cursor);
+        
         /** Handle a native (Win32) windowing event as received from the system */
         virtual LRESULT handleNativeWindowingEvent( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
         
@@ -119,15 +122,20 @@ class GraphicsWindowWin32 : public osgViewer::GraphicsWindow
                 
         void transformMouseXY(float& x, float& y);
         
+        HCURSOR getOrCreateCursor(MouseCursor mouseShape);
         
         HWND            _hwnd;
         HDC             _hdc;
         HGLRC           _hglrc;
+        HCURSOR         _currentCursor;
         
         WNDPROC         _windowProcedure;
         
         double          _timeOfLastCheckEvents;
         
+        
+        
+        
         int             _screenOriginX;
         int             _screenOriginY;
         unsigned int    _screenWidth;
@@ -146,6 +154,8 @@ class GraphicsWindowWin32 : public osgViewer::GraphicsWindow
         bool            _closeWindow;
         bool            _destroyWindow;
         bool            _destroying;
+        
+        std::map<MouseCursor,HCURSOR> _mouseCursorMap;
 };
 
 }
diff --git a/src/osgViewer/GraphicsWindowWin32.cpp b/src/osgViewer/GraphicsWindowWin32.cpp
index 1c6ebc857..d758f7baa 100644
--- a/src/osgViewer/GraphicsWindowWin32.cpp
+++ b/src/osgViewer/GraphicsWindowWin32.cpp
@@ -1021,6 +1021,7 @@ GraphicsWindowWin32::GraphicsWindowWin32( osg::GraphicsContext::Traits* traits )
   _destroying(false)
 {
     _traits = traits;
+    setCursor( LeftArrowCursor);
 
     init();
     
@@ -1772,6 +1773,89 @@ void GraphicsWindowWin32::useCursor( bool cursorOn )
     _traits->useCursor = cursorOn;
 }
 
+void GraphicsWindowWin32::setCursor( MouseCursor mouseCursor )
+{
+    HCURSOR newCursor = getOrCreateCursor( mouseCursor);
+    if (newCursor == _currentCursor) return;
+
+    _currentCursor = newCursor;
+    _traits->useCursor = (_currentCursor != NULL);
+}
+
+HCURSOR GraphicsWindowWin32::getOrCreateCursor(MouseCursor mouseCursor)
+{
+    std::map<MouseCursor,HCURSOR>::iterator i = _mouseCursorMap.find(mouseCursor);
+    if (i != _mouseCursorMap.end()) return i->second;
+
+    switch (mouseCursor) {
+    case NoCursor:
+        _mouseCursorMap[mouseCursor] = NULL;
+    break;
+    case RightArrowCursor:
+    _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_ARROW);
+        break;
+    case LeftArrowCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_ARROW);
+        break;
+    case InfoCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZEALL);
+        break;
+    case DestroyCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_NO );
+        break;
+    case HelpCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_HELP );
+        break;
+    case CycleCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_NO );
+        break;
+    case SprayCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZEALL );
+        break;
+    case WaitCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_WAIT);
+        break;
+    case TextCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_IBEAM );
+        break;
+    case CrosshairCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_CROSS );
+        break;
+    case UpDownCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZENS );
+        break;
+    case LeftRightCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZEWE );
+        break;
+    case TopSideCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_UPARROW );
+        break;
+    case BottomSideCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_UPARROW );
+        break;
+    case LeftSideCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZEWE);
+        break;
+    case RightSideCursor:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZEWE );
+        break;
+    case TopLeftCorner:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZENWSE );
+        break;
+    case TopRightCorner:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZENESW );
+        break;
+    case BottomRightCorner:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZENWSE );
+        break;
+    case BottomLeftCorner:
+        _mouseCursorMap[mouseCursor] = LoadCursor( NULL, IDC_SIZENESW );
+        break;
+    }
+    
+    return _mouseCursorMap[mouseCursor];
+}
+
 void GraphicsWindowWin32::adaptKey( WPARAM wParam, LPARAM lParam, int& keySymbol, unsigned int& modifierMask )
 {
     modifierMask = 0;
@@ -2044,9 +2128,10 @@ LRESULT GraphicsWindowWin32::handleNativeWindowingEvent( HWND hwnd, UINT uMsg, W
         ///////////////////
         case WM_SETCURSOR :
         ///////////////////
-
-            if (_traits->useCursor) return ::DefWindowProc(hwnd, uMsg, wParam, lParam);
-            ::SetCursor(NULL);
+            if (_traits->useCursor) 
+                ::SetCursor( _currentCursor);
+            else
+                ::SetCursor(NULL);
             return TRUE;
 
         /////////////////