Cleaned up drop callback design.

README.md

@@ -46,6 +46,7 @@ The following dependencies are needed by the examples and test programs:
 ## Changelog
 
  - Added native monitor handle access to native API
+ - Added `glfwSetDropCallback` and `GLFWdropfun` for receiving dropped files
  - [Cocoa] Bugfix: Using a 1x1 cursor for hidden mode caused some screen
                    recorders to fail
 

include/GLFW/glfw3.h

@@ -779,13 +779,14 @@ typedef void (* GLFWcharfun)(GLFWwindow*,unsigned int);
  *  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.
+ *  @param[in] count The number of dropped objects.
+ *  @param[in] names The names of the dropped object.
  *
  *  @sa glfwSetDropCallback
  *
  *  @ingroup input
  */
-typedef void (* GLFWdropfun)(GLFWwindow*,const char*);
+typedef void (* GLFWdropfun)(GLFWwindow*,int,const char**);
 
 /*! @brief The function signature for monitor configuration callbacks.
  *

src/cocoa_window.m

@@ -413,8 +413,6 @@ static int translateKey(unsigned int key)
 @interface GLFWContentView : NSView
 {
     _GLFWwindow* window;
-    char * fileNamesForDrag;
-    int fileNamesSize;
     NSTrackingArea* trackingArea;
 }
 
@@ -446,9 +444,6 @@ static int translateKey(unsigned int key)
         window = initWindow;
         trackingArea = nil;
 
-        fileNamesForDrag = malloc(1024);
-        fileNamesSize = 1024;
-
         [self updateTrackingAreas];
         [self registerForDraggedTypes:[NSArray arrayWithObjects:
                                        NSFilenamesPboardType, nil]];
@@ -460,7 +455,6 @@ static int translateKey(unsigned int key)
 -(void)dealloc
 {
     [trackingArea release];
-    free(fileNamesForDrag);
     [super dealloc];
 }
 
@@ -696,38 +690,27 @@ static int translateKey(unsigned int key)
     NSPasteboard* pasteboard = [sender draggingPasteboard];
     NSArray* files = [pasteboard propertyListForType:NSFilenamesPboardType];
 
-    // set the first char to 0 so strcat
-    // starts to add from the beginning
-    fileNamesForDrag[0] = 0;
-
-    const int dragX = [sender draggingLocation].x;
-    const 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);
+    _glfwInputCursorMotion(window,
-    _glfwInputDrop(window, fileNamesForDrag);
+                           [sender draggingLocation].x,
+                           height - [sender draggingLocation].y);
+
+    const int count = [files count];
+    if (count)
+    {
+        NSEnumerator* e = [files objectEnumerator];
+        char** names = calloc(count, sizeof(char*));
+
+        for (int i = 0;  i < count;  i++)
+            names[i] = strdup([[e nextObject] UTF8String]);
+
+        _glfwInputDrop(window, count, (const char**) names);
+
+        for (int i = 0;  i < count;  i++)
+            free(names[i]);
+        free(names);
+    }
 
     return YES;
 }

src/input.c

@@ -211,10 +211,10 @@ void _glfwInputCursorEnter(_GLFWwindow* window, int entered)
         window->callbacks.cursorEnter((GLFWwindow*) window, entered);
 }
 
-void _glfwInputDrop(_GLFWwindow* window, const char* dropString)
+void _glfwInputDrop(_GLFWwindow* window, int count, const char** names)
 {
     if (window->callbacks.drop)
-        window->callbacks.drop((GLFWwindow*) window, dropString);
+        window->callbacks.drop((GLFWwindow*) window, count, names);
 }
 
 

src/internal.h

@@ -681,11 +681,11 @@ 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
+ *  @param[in] count The number of dropped objects.
- *  description.
+ *  @param[in] names The names of the dropped objects.
  *  @ingroup event
  */
-void _glfwInputDrop(_GLFWwindow* window, const char* dropString);
+void _glfwInputDrop(_GLFWwindow* window, int count, const char** names);
 
 
 //========================================================================

src/win32_init.c

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

src/win32_platform.h

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

src/win32_window.c

@@ -751,38 +751,34 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
 
         case WM_DROPFILES:
         {
-            WCHAR szName[MAX_PATH];
             HDROP hDrop = (HDROP) wParam;
             POINT pt;
-            const int numFiles = DragQueryFile(hDrop, 0xffffffff, szName, MAX_PATH);
+            int i;
-            int i, currentSize = 1;
+
-            char* utf8str;
+            const int count = DragQueryFile(hDrop, 0xffffffff, NULL, 0);
+            char** names = calloc(count, sizeof(char*));
 
             // Move the mouse to the position of the drop
             DragQueryPoint(hDrop, &pt);
             _glfwInputCursorMotion(window, pt.x, pt.y);
 
-            memset(_glfw.win32.dropString, 0, _glfw.win32.dropStringSize);
+            for (i = 0;  i < count;  i++)
-
-            for (i = 0;  i < numFiles;  i++)
             {
-                DragQueryFile(hDrop, i, szName, MAX_PATH);
+                const UINT length = DragQueryFile(hDrop, i, NULL, 0);
-                utf8str = _glfwCreateUTF8FromWideString((const WCHAR*) szName);
+                WCHAR* buffer = calloc(length + 1, sizeof(WCHAR));
-                currentSize += strlen(utf8str);
 
-                if (_glfw.win32.dropStringSize < currentSize)
+                DragQueryFile(hDrop, i, buffer, length + 1);
-                {
+                names[i] = _glfwCreateUTF8FromWideString(buffer);
-                    _glfw.win32.dropStringSize *= 2;
-                    _glfw.win32.dropString = realloc(_glfw.win32.dropString,
-                                                     _glfw.win32.dropStringSize);
-                }
 
-                strcat(_glfw.win32.dropString, utf8str);
+                free(buffer);
-                strcat(_glfw.win32.dropString, "\n");
-                free(utf8str);
             }
 
-            _glfwInputDrop(window,_glfw.win32.dropString);
+            _glfwInputDrop(window, count, (const char**) names);
+
+            for (i = 0;  i < count;  i++)
+                free(names[i]);
+            free(names);
+
             DragFinish(hDrop);
             break;
         }

src/x11_platform.h

@@ -132,10 +132,6 @@ typedef struct _GLFWlibraryX11
 
 	struct {
 		Window      sourceWindow;
-		char*		string;
-		char*		type1;
-		char*		type2;
-		char*		type3;
 	} xdnd;
 
     // Selection atoms

src/x11_window.c

@@ -97,6 +97,51 @@ static int translateChar(XKeyEvent* event)
     return (int) _glfwKeySym2Unicode(keysym);
 }
 
+// Splits a text/uri-list into separate file paths
+//
+static char** splitUriList(char* text, int* count)
+{
+    const char* prefix = "file://";
+    char** names = NULL;
+    char* line;
+
+    *count = 0;
+
+    while ((line = strtok(text, "\r\n")))
+    {
+        text = NULL;
+
+        if (*line == '#')
+            continue;
+
+        if (strncmp(line, prefix, strlen(prefix)) == 0)
+            line += strlen(prefix);
+
+        (*count)++;
+
+        char* name = calloc(strlen(line) + 1, 1);
+        names = realloc(names, *count * sizeof(char*));
+        names[*count - 1] = name;
+
+        while (*line)
+        {
+            if (line[0] == '%' && line[1] && line[2])
+            {
+                const char digits[3] = { line[1], line[2], '\0' };
+                *name = strtol(digits, NULL, 16);
+                line += 2;
+            }
+            else
+                *name = *line;
+
+            name++;
+            line++;
+        }
+    }
+
+    return names;
+}
+
 // Create the X11 window (and its colormap)
 //
 static GLboolean createWindow(_GLFWwindow* window,
@@ -714,7 +759,6 @@ static void processEvent(XEvent *event)
                            False,
                            SubstructureNotifyMask | SubstructureRedirectMask,
                            event);
-
             }
             else if (event->xclient.message_type == _glfw.x11.XdndEnter)
             {
@@ -733,9 +777,6 @@ static void processEvent(XEvent *event)
                                   _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
@@ -771,15 +812,12 @@ static void processEvent(XEvent *event)
 
         case SelectionNotify:
         {
-            if (event->xselection.property != None)
+            if (event->xselection.property)
             {
                 // 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;
-
                 const int result = _glfwGetWindowProperty(event->xselection.requestor,
                                                           event->xselection.property,
                                                           event->xselection.target,
@@ -787,30 +825,18 @@ static void processEvent(XEvent *event)
 
                 if (result)
                 {
-                    // Nautilus seems to add a \r at the end of the paths
+                    int i, count;
-                    // remove it so paths can be directly used
+                    char** names = splitUriList(data, &count);
-                    _glfw.x11.xdnd.string = malloc(strlen(data) + 1);
-                    char *to = _glfw.x11.xdnd.string;
-                    const char *from = data;
-                    const char *current = strchr(from, '\r');
 
-                    while (current)
+                    _glfwInputDrop(window, count, (const char**) names);
-                    {
-                        const int charsToCopy = current - from;
-                        memcpy(to, from, (size_t) charsToCopy);
-                        to += charsToCopy;
 
-                        from = current + 1;
+                    for (i = 0;  i < count;  i++)
-                        current = strchr(from, '\r');
+                        free(names[i]);
-                    }
+                    free(names);
-
-                    const size_t remaining = strlen(from);
-
-                    memcpy(to, from, remaining);
-                    to += remaining;
-                    *to = 0;
                 }
 
+                XFree(data);
+
                 XEvent reply;
                 memset(&reply, 0, sizeof(reply));
 
@@ -825,11 +851,7 @@ static void processEvent(XEvent *event)
                 // Reply that all is well
                 XSendEvent(_glfw.x11.display, _glfw.x11.xdnd.sourceWindow,
                            False, NoEventMask, &reply);
-                XSync(_glfw.x11.display, False);
+                XFlush(_glfw.x11.display);
-                XFree(data);
-
-                if (result)
-                    _glfwInputDrop(window, _glfw.x11.xdnd.string);
             }
 
             break;

tests/events.c

@@ -381,12 +381,14 @@ static void char_callback(GLFWwindow* window, unsigned int codepoint)
            get_character_string(codepoint));
 }
 
-static void drop_callback(GLFWwindow* window, const char* descriptor)
+static void drop_callback(GLFWwindow* window, int count, const char** names)
 {
-    printf("%08x at %0.3f: Drop of \"%s\" input\n",
+    int i;
-           counter++,
+
-           glfwGetTime(),
+    printf("%08x at %0.3f: Drop input\n", counter++, glfwGetTime());
-           descriptor);
+
+    for (i = 0;  i < count;  i++)
+        printf("  %i: \"%s\"\n", i, names[i]);
 }
 
 void monitor_callback(GLFWmonitor* monitor, int event)