API for registering MIME types for drag enter

glfw/cocoa_window.m

@@ -3876,6 +3876,17 @@ glfwCocoaCycleThroughOSWindows(bool backwards) {
 }
 
 
+GLFWAPI void
+glfwCocoaRegisterMIMETypes(GLFWwindow *window, const char **mimes, size_t count) {
+    _GLFWwindow *w = (_GLFWwindow*)window;
+    NSArray *currentTypes = [w->ns.view registeredDraggedTypes];
+    NSMutableArray *updatedTypes = [NSMutableArray arrayWithArray:currentTypes];
+    for (size_t i = 0; i < count; i++) {
+        NSString *uti = mime_to_uti(mimes[i]);
+        if (![updatedTypes containsObject:uti]) [updatedTypes addObject:uti];
+    }
+    [w->ns.view registerForDraggedTypes:updatedTypes];
+}
 
 //////////////////////////////////////////////////////////////////////////
 //////                       GLFW internal API                      //////

glfw/glfw.py

@@ -316,6 +316,7 @@ def generate_wrappers(glfw_header: str) -> None:
     void glfwCocoaCycleThroughOSWindows(bool backwards)
     void glfwCocoaSetWindowChrome(GLFWwindow* window, unsigned int color, bool use_system_color, unsigned int system_color,\
     int background_blur, unsigned int hide_window_decorations, bool show_text_in_titlebar, int color_space, float background_opacity, bool resizable)
+    void glfwCocoaRegisterMIMETypes(GLFWwindow *window, const char **mimes, size_t count)
     const char* glfwGetPrimarySelectionString(GLFWwindow* window, void)
     int glfwGetNativeKeyForName(const char* key_name, int case_sensitive)
     void glfwRequestWaylandFrameEvent(GLFWwindow *handle, unsigned long long id, GLFWwaylandframecallbackfunc callback)

kitty/glfw-wrapper.c

@@ -491,6 +491,9 @@ load_glfw(const char* path) {
     *(void **) (&glfwCocoaSetWindowChrome_impl) = dlsym(handle, "glfwCocoaSetWindowChrome");
     if (glfwCocoaSetWindowChrome_impl == NULL) dlerror(); // clear error indicator
 
+    *(void **) (&glfwCocoaRegisterMIMETypes_impl) = dlsym(handle, "glfwCocoaRegisterMIMETypes");
+    if (glfwCocoaRegisterMIMETypes_impl == NULL) dlerror(); // clear error indicator
+
     *(void **) (&glfwGetPrimarySelectionString_impl) = dlsym(handle, "glfwGetPrimarySelectionString");
     if (glfwGetPrimarySelectionString_impl == NULL) dlerror(); // clear error indicator
 

kitty/glfw-wrapper.h

@@ -1540,7 +1540,7 @@ typedef void (* GLFWscrollfun)(GLFWwindow*,const GLFWScrollEvent*);
 typedef void (* GLFWkeyboardfun)(GLFWwindow*, GLFWkeyevent*);
 
 typedef enum {
-    GLFW_DRAG_DATA_REQUEST,
+    GLFW_DRAG_DATA_REQUEST,  // request data for specified mime type
     GLFW_DRAG_CANCELLED,
     GLFW_DRAG_FINSHED,
     GLFW_DRAG_ACCEPTED,  // mimetype was accepted or NULL if drag was accepted but no mime type specified
@@ -1557,8 +1557,14 @@ typedef struct GLFWDragSourceItem {
 
 typedef struct GLFWDragEvent {
     GLFWDragEventType type;
+    // When the drag event callback is called with a mimetype and no data, the
+    // application should set the data ans data_sz and err_num fields.
+    // Once glfw is done reading the data the drag event callback will be
+    // called with the data pointer unchanged. The application is now free
+    // to delete the data, as needed.
     const char *mime_type;
-    const char *data; size_t data_sz; int err_num;
+    const char *data; size_t data_sz;
+    int err_num;  // POSIX error code indicating failure fetching data
     GLFWDragOperationType action;  // can be 0 indicating no action
 } GLFWDragEvent;
 
@@ -2459,6 +2465,10 @@ typedef void (*glfwCocoaSetWindowChrome_func)(GLFWwindow*, unsigned int, bool, u
 GFW_EXTERN glfwCocoaSetWindowChrome_func glfwCocoaSetWindowChrome_impl;
 #define glfwCocoaSetWindowChrome glfwCocoaSetWindowChrome_impl
 
+typedef void (*glfwCocoaRegisterMIMETypes_func)(GLFWwindow*, const char**, size_t);
+GFW_EXTERN glfwCocoaRegisterMIMETypes_func glfwCocoaRegisterMIMETypes_impl;
+#define glfwCocoaRegisterMIMETypes glfwCocoaRegisterMIMETypes_impl
+
 typedef const char* (*glfwGetPrimarySelectionString_func)(GLFWwindow*);
 GFW_EXTERN glfwGetPrimarySelectionString_func glfwGetPrimarySelectionString_impl;
 #define glfwGetPrimarySelectionString glfwGetPrimarySelectionString_impl