Initial drag and drop support.

include/GLFW/glfw3.h

@@ -773,6 +773,20 @@ typedef void (* GLFWkeyfun)(GLFWwindow*,int,int,int,int);
  */
 typedef void (* GLFWcharfun)(GLFWwindow*,unsigned int);
 
+
+/*! @brief The function signature for drop callbacks.
+ *
+ *  This is the function signature for drop callbacks.
+ *
+ *  @param[in] window The window that received the event.
+ *  @param[in] string The string descriptor for the dropped object.
+ *
+ *  @sa glfwSetDropCallback
+ *
+ *  @ingroup input
+ */
+typedef void (* GLFWdropfun)(GLFWwindow*,const char*);
+
 /*! @brief The function signature for monitor configuration callbacks.
  *
  *  This is the function signature for monitor configuration callback functions.
@@ -2014,6 +2028,22 @@ GLFWAPI GLFWcursorenterfun glfwSetCursorEnterCallback(GLFWwindow* window, GLFWcu
  */
 GLFWAPI GLFWscrollfun glfwSetScrollCallback(GLFWwindow* window, GLFWscrollfun cbfun);
 
+/*! @brief Sets the drop callback.
+ *
+ *  This function sets the drop callback of the specified window, which is
+ *  called when an object is dropped over the window.
+ *
+ *
+ *  @param[in] window The window whose callback to set.
+ *  @param[in] cbfun The new drop callback, or `NULL` to remove the currently
+ *  set callback.
+ *  @return The previously set callback, or `NULL` if no callback was set or an
+ *  error occurred.
+ *
+ *  @ingroup input
+ */
+GLFWAPI GLFWdropfun glfwSetDropCallback(GLFWwindow* window, GLFWdropfun cbfun);
+
 /*! @brief Returns whether the specified joystick is present.
  *
  *  This function returns whether the specified joystick is present.

src/cocoa_window.m

@@ -413,6 +413,8 @@ static int translateKey(unsigned int key)
 @interface GLFWContentView : NSView
 {
     _GLFWwindow* window;
+    char * fileNamesForDrag;
+    int fileNamesSize;
     NSTrackingArea* trackingArea;
 }
 
@@ -444,7 +446,14 @@ static int translateKey(unsigned int key)
         window = initWindow;
         trackingArea = nil;
         
+        fileNamesForDrag = (char*)malloc(1024);
+        fileNamesSize = 1024;
+        
         [self updateTrackingAreas];
+        
+        
+        [self registerForDraggedTypes:[NSArray arrayWithObjects:
+                                       NSFilenamesPboardType, nil]];
     }
 
     return self;
@@ -453,6 +462,7 @@ static int translateKey(unsigned int key)
 -(void)dealloc
 {
     [trackingArea release];
+    free(fileNamesForDrag);
     [super dealloc];
 }
 
@@ -657,6 +667,72 @@ static int translateKey(unsigned int key)
         _glfwInputScroll(window, deltaX, deltaY);
 }
 
+
+// arturoc: this makes the cursor dissapear when the window is
+// resized or received a drag operation
+/*- (void)resetCursorRects
+{
+    [self discardCursorRects];
+    [self addCursorRect:[self bounds] cursor:_glfw.ns.cursor];
+}*/
+
+- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
+{
+    if ((NSDragOperationGeneric & [sender draggingSourceOperationMask]) 
+		== NSDragOperationGeneric) {
+        
+		[self setNeedsDisplay:YES];
+        
+        return NSDragOperationGeneric;
+		
+    }
+    
+	return NSDragOperationNone;	
+}
+
+- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender {
+    [self setNeedsDisplay:YES];
+    return YES;
+}
+
+- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender {
+	NSPasteboard *zPasteboard = [sender draggingPasteboard];
+	NSArray *files = [zPasteboard propertyListForType:NSFilenamesPboardType];
+	
+    // set the first char to 0 so strcat
+    // starts to add from the beginning
+	fileNamesForDrag[0] = 0;
+
+	int dragX = [sender draggingLocation].x;
+	int dragY = [sender draggingLocation].y;
+	
+	int dragSize = 1;
+	if ([files count]) {
+		NSEnumerator *filenameEnum = [files objectEnumerator]; 
+        NSString *name;
+		while (name = [filenameEnum nextObject]) {
+            dragSize += [name length]+1;
+			if (dragSize > fileNamesSize){
+                fileNamesSize *= 2;
+                fileNamesForDrag = realloc(fileNamesForDrag, fileNamesSize);
+            }
+            strcat(fileNamesForDrag, [name UTF8String]);
+            strcat(fileNamesForDrag, "\n");
+		}
+	}
+	
+    int height;
+	_glfwPlatformGetWindowSize(window, NULL, &height);
+    _glfwInputCursorMotion(window, dragX,  height-dragY);
+    _glfwInputDrop(window, fileNamesForDrag);
+    
+	return YES;
+}
+
+- (void)concludeDragOperation:(id <NSDraggingInfo>)sender {
+    [self setNeedsDisplay:YES];
+}
+
 @end
 
 

src/input.c

@@ -211,6 +211,12 @@ void _glfwInputCursorEnter(_GLFWwindow* window, int entered)
         window->callbacks.cursorEnter((GLFWwindow*) window, entered);
 }
 
+void _glfwInputDrop(_GLFWwindow* window, const char* dropString){
+
+    if (window->callbacks.drop)
+        window->callbacks.drop((GLFWwindow*) window, dropString);
+}
+
 
 //////////////////////////////////////////////////////////////////////////
 //////                        GLFW public API                       //////
@@ -394,3 +400,14 @@ GLFWAPI GLFWscrollfun glfwSetScrollCallback(GLFWwindow* handle,
     return cbfun;
 }
 
+GLFWAPI GLFWdropfun glfwSetDropCallback(GLFWwindow* handle, GLFWdropfun cbfun)
+{
+    _GLFWwindow* window = (_GLFWwindow*) handle;
+    GLFWdropfun previous;
+
+    _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
+
+    previous = window->callbacks.drop;
+    window->callbacks.drop = cbfun;
+    return previous;
+}

src/internal.h

@@ -239,6 +239,7 @@ struct _GLFWwindow
         GLFWscrollfun           scroll;
         GLFWkeyfun              key;
         GLFWcharfun             character;
+        GLFWdropfun             drop;
     } callbacks;
 
     // This is defined in the window API's platform.h
@@ -678,6 +679,14 @@ void _glfwInputMonitorChange(void);
  */
 void _glfwInputError(int error, const char* format, ...);
 
+/*! @brief Notifies dropped object over window.
+ *  @param[in] window The window that received the event.
+ *  @param[in] dropString The string descriptor of the dropped object
+ *  description.
+ *  @ingroup event
+ */
+void _glfwInputDrop(_GLFWwindow* window, const char* dropString);
+
 
 //========================================================================
 // Utility functions

src/win32_init.c

@@ -215,6 +215,9 @@ int _glfwPlatformInit(void)
     if (!_glfwInitContextAPI())
         return GL_FALSE;
 	
+	_glfw.win32.dropString = (char*)malloc(1000);
+	_glfw.win32.dropStringSize = 1000;
+
     _glfwInitTimer();
     _glfwInitJoysticks();
 

src/win32_platform.h

@@ -169,6 +169,8 @@ typedef struct _GLFWlibraryWin32
     ATOM                classAtom;
     DWORD               foregroundLockTimeout;
     char*               clipboardString;
+    char*				dropString;
+	int					dropStringSize;
 
     // Timer data
     struct {

src/win32_window.c

@@ -29,7 +29,9 @@
 
 #include <stdlib.h>
 #include <malloc.h>
+#include <Windows.h>
 #include <windowsx.h>
+#include <Shellapi.h>
 
 #define _GLFW_KEY_INVALID -2
 
@@ -747,6 +749,39 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
             // TODO: Restore vsync if compositing was disabled
             break;
         }
+        case WM_DROPFILES:
+        {
+			TCHAR szName[MAX_PATH];
+			HDROP hDrop = (HDROP)wParam;
+			POINT pt;
+			int numFiles = DragQueryFile(hDrop, 0xFFFFFFFF, szName, MAX_PATH);
+			int currentSize = 1;
+			int i;
+			char* utf8str;
+			DragQueryPoint(hDrop, &pt);
+
+			// Move the mouse to the position of the drop
+			_glfwInputCursorMotion(window,pt.x,pt.y);
+			
+			memset(_glfw.win32.dropString, 0, _glfw.win32.dropStringSize);
+			for(i = 0; i < numFiles; i++)
+			{
+				DragQueryFile(hDrop, i, szName, MAX_PATH);
+				utf8str = _glfwCreateUTF8FromWideString((const wchar_t*)szName);
+				currentSize += strlen(utf8str);
+				if(_glfw.win32.dropStringSize < currentSize){
+					_glfw.win32.dropStringSize *= 2;
+					_glfw.win32.dropString = (char*)realloc(_glfw.win32.dropString,_glfw.win32.dropStringSize);
+				}
+				strcat(_glfw.win32.dropString, utf8str);
+				strcat(_glfw.win32.dropString, "\n");
+				free(utf8str);
+			}
+			
+			_glfwInputDrop(window,_glfw.win32.dropString);
+			DragFinish(hDrop);
+			break;
+        }
     }
 
     return DefWindowProc(hWnd, uMsg, wParam, lParam);
@@ -866,6 +901,8 @@ static int createWindow(_GLFWwindow* window,
 
     free(wideTitle);
 	
+	DragAcceptFiles(window->win32.handle, TRUE);
+
     if (!window->win32.handle)
     {
         _glfwInputError(GLFW_PLATFORM_ERROR, "Win32: Failed to create window");

src/x11_init.c

@@ -32,6 +32,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <limits.h>
+#include <stdio.h>
 
 
 // Translate an X11 key code to a GLFW key code.
@@ -394,7 +395,6 @@ static void detectEWMH(void)
                                        (unsigned char**) &supportedAtoms);
 
     // See which of the atoms we support that are supported by the WM
-
     _glfw.x11.NET_WM_STATE =
         getSupportedAtom(supportedAtoms, atomCount, "_NET_WM_STATE");
     _glfw.x11.NET_WM_STATE_FULLSCREEN =
@@ -539,6 +539,21 @@ static GLboolean initExtensions(void)
     _glfw.x11.SAVE_TARGETS =
         XInternAtom(_glfw.x11.display, "SAVE_TARGETS", False);
 
+    // Find or create drag and drop atoms
+
+	//Atoms for Xdnd
+    _glfw.x11.XdndAware = XInternAtom(_glfw.x11.display, "XdndAware", True);
+    _glfw.x11.XdndEnter = XInternAtom(_glfw.x11.display, "XdndEnter", True);
+    _glfw.x11.XdndPosition = XInternAtom(_glfw.x11.display, "XdndPosition", True);
+    _glfw.x11.XdndStatus = XInternAtom(_glfw.x11.display, "XdndStatus", True);
+    _glfw.x11.XdndActionCopy = XInternAtom(_glfw.x11.display, "XdndActionCopy", True);
+    _glfw.x11.XdndDrop = XInternAtom(_glfw.x11.display, "XdndDrop", True);
+    _glfw.x11.XdndLeave = XInternAtom(_glfw.x11.display, "XdndLeave", True);
+    _glfw.x11.XdndFinished = XInternAtom(_glfw.x11.display, "XdndFinished", True);
+    _glfw.x11.XdndSelection = XInternAtom(_glfw.x11.display, "XdndSelection", True);
+
+
+
     return GL_TRUE;
 }
 

src/x11_platform.h

@@ -119,6 +119,24 @@ typedef struct _GLFWlibraryX11
     Atom            NET_ACTIVE_WINDOW;
     Atom            MOTIF_WM_HINTS;
 
+	// Atoms for Xdnd
+    Atom			XdndAware;
+	Atom 			XdndEnter;
+	Atom 			XdndPosition;
+	Atom 			XdndStatus;
+	Atom 			XdndActionCopy;
+	Atom 			XdndDrop;
+	Atom 			XdndLeave;
+	Atom 			XdndFinished;
+	Atom 			XdndSelection;
+	struct{
+		Window 			sourceWindow;
+		char*			string;
+		char*			type1;
+		char*			type2;
+		char*			type3;
+	} xdnd;
+
     // Selection atoms
     Atom            TARGETS;
     Atom            MULTIPLE;

src/x11_window.c

@@ -306,6 +306,14 @@ static GLboolean createWindow(_GLFWwindow* window,
         XISelectEvents(_glfw.x11.display, window->x11.handle, &eventmask, 1);
     }
 
+    // Enable Xdnd
+    if(_glfw.x11.XdndAware!=None)
+    {
+    	//Announce XDND support
+		Atom version=5;
+		XChangeProperty(_glfw.x11.display, window->x11.handle, _glfw.x11.XdndAware, XA_ATOM, 32, PropModeReplace, (unsigned char*)&version, 1);
+    }
+
     _glfwPlatformSetWindowTitle(window, wndconfig->title);
 
     XRRSelectInput(_glfw.x11.display, window->x11.handle,
@@ -494,6 +502,7 @@ static void leaveFullscreenMode(_GLFWwindow* window)
     }
 }
 
+
 // Process the specified X event
 //
 static void processEvent(XEvent *event)
@@ -703,10 +712,128 @@ static void processEvent(XEvent *event)
                            False,
                            SubstructureNotifyMask | SubstructureRedirectMask,
                            event);
+
+            }
+            else if(event->xclient.message_type == _glfw.x11.XdndEnter)
+            {
+            	// Xdnd Enter: the drag&drop event has started in the window,
+            	// we could be getting the type and possible conversions here
+            	// but since we use always string conversion we don't need
+            	// it
+            }
+            else if(event->xclient.message_type == _glfw.x11.XdndDrop)
+            {
+            	// Xdnd Drop: The drag&drop event has finished dropping on
+            	// the window, ask to convert the selection
+            	_glfw.x11.xdnd.sourceWindow = event->xclient.data.l[0];
+				XConvertSelection(_glfw.x11.display,
+								  _glfw.x11.XdndSelection,
+								  _glfw.x11.UTF8_STRING,
+								  _glfw.x11.XdndSelection,
+								  window->x11.handle, CurrentTime);
+
+            }
+            else if(event->xclient.message_type == _glfw.x11.XdndLeave)
+            {
+
+            }
+            else if(event->xclient.message_type == _glfw.x11.XdndPosition)
+            {
+            	// Xdnd Position: get coordinates of the mouse inside the window
+            	// and update the mouse position
+            	int absX = (event->xclient.data.l[2]>>16) & 0xFFFF;
+            	int absY = (event->xclient.data.l[2]) & 0xFFFF;
+            	int x;
+            	int y;
+
+            	_glfwPlatformGetWindowPos(window,&x,&y);
+
+            	_glfwInputCursorMotion(window,absX-x,absY-y);
+
+				// Xdnd: reply with an XDND status message
+				XClientMessageEvent m;
+				memset(&m, sizeof(m), 0);
+				m.type = ClientMessage;
+				m.display = event->xclient.display;
+				m.window = event->xclient.data.l[0];
+				m.message_type = _glfw.x11.XdndStatus;
+				m.format=32;
+				m.data.l[0] = window->x11.handle;
+				m.data.l[1] = 1; // Always accept the dnd with no rectangle
+				m.data.l[2] = 0; // Specify an empty rectangle
+				m.data.l[3] = 0;
+				m.data.l[4] = _glfw.x11.XdndActionCopy; // We only accept copying
+
+				XSendEvent(_glfw.x11.display, event->xclient.data.l[0], False, NoEventMask, (XEvent*)&m);
+				XFlush(_glfw.x11.display);
             }
 
             break;
         }
+        case SelectionNotify:
+		{
+			if(event->xselection.property != None)
+			{
+				// Xdnd: got a selection notification from the conversion
+				// we asked for, get the data and finish the d&d event
+				char* data;
+				free(_glfw.x11.xdnd.string);
+				_glfw.x11.xdnd.string = NULL;
+				int result = _glfwGetWindowProperty(event->xselection.requestor,
+				                                   event->xselection.property,
+				                                   event->xselection.target,
+				                                   (unsigned char**) &data);
+
+				if(result){
+					// nautilus seems to add a \r at the end of the paths
+					// remove it so paths can be directly used
+					_glfw.x11.xdnd.string = malloc(strlen(data));
+					char *to = _glfw.x11.xdnd.string;
+					const char *from = data;
+					const char *current = strchr(from, '\r');
+					while(current)
+					{
+						int charsToCopy = current - from;
+						memcpy(to, from, (size_t)charsToCopy);
+						to += charsToCopy;
+
+						from = current+1;
+						current = strchr(from, '\r');
+					}
+
+					size_t remaining = strlen(from);
+
+					memcpy(to, from, remaining);
+					to += remaining;
+					*to = 0;
+				}
+
+				XClientMessageEvent m;
+				memset(&m, sizeof(m), 0);
+				m.type = ClientMessage;
+				m.display = _glfw.x11.display;
+				m.window = _glfw.x11.xdnd.sourceWindow;
+				m.message_type = _glfw.x11.XdndFinished;
+				m.format=32;
+				m.data.l[0] = window->x11.handle;
+				m.data.l[1] = result;
+				m.data.l[2] = _glfw.x11.XdndActionCopy; //We only ever copy.
+
+				// Reply that all is well.
+				XSendEvent(_glfw.x11.display, _glfw.x11.xdnd.sourceWindow, False, NoEventMask, (XEvent*)&m);
+
+				XSync(_glfw.x11.display, False);
+
+				XFree(data);
+
+				if(result)
+				{
+					_glfwInputDrop(window,_glfw.x11.xdnd.string);
+
+				}
+			}
+			break;
+		}
 
         case MapNotify:
         {
@@ -897,7 +1024,7 @@ unsigned long _glfwGetWindowProperty(Window window,
                        &bytesAfter,
                        value);
 
-    if (actualType != type)
+    if (type != AnyPropertyType && actualType != type)
         return 0;
 
     return itemCount;
@@ -1001,7 +1128,6 @@ void _glfwPlatformGetWindowPos(_GLFWwindow* window, int* xpos, int* ypos)
     if (child)
     {
         int left, top;
-
         XTranslateCoordinates(_glfw.x11.display, window->x11.handle, child,
                               0, 0, &left, &top, &child);