File Selector, support filepath dropping

This adds support for dropping a filepath on an open file-selector to set that path.

source/blender/editors/space_file/file_intern.h

@@ -93,6 +93,7 @@ void FILE_OT_filenum(struct wmOperatorType *ot);
 void FILE_OT_delete(struct wmOperatorType *ot);
 void FILE_OT_rename(struct wmOperatorType *ot);
 void FILE_OT_smoothscroll(struct wmOperatorType *ot);
+void FILE_OT_filepath_drop(struct wmOperatorType *ot);
 
 int file_exec(bContext *C, struct wmOperator *exec_op);
 int file_cancel_exec(bContext *C, struct wmOperator *unused);
@@ -107,7 +108,9 @@ void file_filename_enter_handle(bContext *C, void *arg_unused, void *arg_but);
 
 int file_highlight_set(struct SpaceFile *sfile, struct ARegion *ar, int mx, int my);
 
-void file_sfile_to_operator(struct wmOperator *op, struct SpaceFile *sfile, char *filepath);
+void file_sfile_filepath_set(struct SpaceFile *sfile, const char *filepath);
+void file_sfile_to_operator_ex(struct wmOperator *op, struct SpaceFile *sfile, char *filepath);
+void file_sfile_to_operator(struct wmOperator *op, struct SpaceFile *sfile);
 void file_operator_to_sfile(struct SpaceFile *sfile, struct wmOperator *op);
 
 

source/blender/editors/space_file/file_ops.c

@@ -1188,7 +1188,7 @@ void FILE_OT_cancel(struct wmOperatorType *ot)
 }
 
 
-void file_sfile_to_operator(wmOperator *op, SpaceFile *sfile, char *filepath)
+void file_sfile_to_operator_ex(wmOperator *op, SpaceFile *sfile, char *filepath)
 {
 	PropertyRNA *prop;
 
@@ -1258,6 +1258,12 @@ void file_sfile_to_operator(wmOperator *op, SpaceFile *sfile, char *filepath)
 
 	}
 }
+void file_sfile_to_operator(wmOperator *op, SpaceFile *sfile)
+{
+	char filepath[FILE_MAX];
+
+	file_sfile_to_operator_ex(op, sfile, filepath);
+}
 
 void file_operator_to_sfile(SpaceFile *sfile, wmOperator *op)
 {
@@ -1285,14 +1291,35 @@ void file_operator_to_sfile(SpaceFile *sfile, wmOperator *op)
 	/* XXX, files and dirs updates missing, not really so important though */
 }
 
+/**
+ * Use to set the file selector path from some arbitrary source.
+ */
+void file_sfile_filepath_set(SpaceFile *sfile, const char *filepath)
+{
+	BLI_assert(BLI_exists(filepath));
+
+	if (BLI_is_dir(filepath)) {
+		BLI_strncpy(sfile->params->dir, filepath, sizeof(sfile->params->dir));
+		sfile->params->file[0] = '\0';
+	}
+	else {
+		if ((sfile->params->flag & FILE_DIRSEL_ONLY) == 0) {
+			BLI_split_dirfile(filepath, sfile->params->dir, sfile->params->file,
+			                  sizeof(sfile->params->dir), sizeof(sfile->params->file));
+		}
+		else{
+			BLI_split_dir_part(filepath, sfile->params->dir, sizeof(sfile->params->dir));
+		}
+	}
+}
+
 void file_draw_check(bContext *C)
 {
 	SpaceFile *sfile = CTX_wm_space_file(C);
 	wmOperator *op = sfile->op;
 	if (op) { /* fail on reload */
 		if (op->type->check) {
-			char filepath[FILE_MAX];
+			file_sfile_to_operator(op, sfile);
-			file_sfile_to_operator(op, sfile, filepath);
 			
 			/* redraw */
 			if (op->type->check(C, op)) {
@@ -1375,7 +1402,7 @@ int file_exec(bContext *C, wmOperator *exec_op)
 		
 		sfile->op = NULL;
 
-		file_sfile_to_operator(op, sfile, filepath);
+		file_sfile_to_operator_ex(op, sfile, filepath);
 
 		if (BLI_exists(sfile->params->dir)) {
 			fsmenu_insert_entry(ED_fsmenu_get(), FS_CATEGORY_RECENT, sfile->params->dir, NULL,
@@ -1652,6 +1679,45 @@ void FILE_OT_smoothscroll(wmOperatorType *ot)
 }
 
 
+static int filepath_drop_exec(bContext *C, wmOperator *op)
+{
+	SpaceFile *sfile = CTX_wm_space_file(C);
+
+	if (sfile) {
+		char filepath[FILE_MAX];
+
+		RNA_string_get(op->ptr, "filepath", filepath);
+		if (!BLI_exists(filepath)) {
+			BKE_report(op->reports, RPT_ERROR, "File does not exist");
+			return OPERATOR_CANCELLED;
+		}
+
+		file_sfile_filepath_set(sfile, filepath);
+
+		if (sfile->op) {
+			file_sfile_to_operator(sfile->op, sfile);
+			file_draw_check(C);
+		}
+
+		WM_event_add_notifier(C, NC_SPACE | ND_SPACE_FILE_PARAMS, NULL);
+		return OPERATOR_FINISHED;
+	}
+
+	return OPERATOR_CANCELLED;
+}
+
+void FILE_OT_filepath_drop(wmOperatorType *ot)
+{
+	ot->name = "File Selector Drop";
+	ot->description = "";
+	ot->idname = "FILE_OT_filepath_drop";
+
+	ot->exec = filepath_drop_exec;
+	ot->poll = WM_operator_winactive;
+
+	RNA_def_string_file_path(ot->srna, "filepath", "Path", FILE_MAX, "", "");
+}
+
 /* create a new, non-existing folder name, returns 1 if successful, 0 if name couldn't be created.
  * The actual name is returned in 'name', 'folder' contains the complete path, including the new folder name.
  */

source/blender/editors/space_file/space_file.c

@@ -441,6 +441,7 @@ static void file_operatortypes(void)
 	WM_operatortype_append(FILE_OT_delete);
 	WM_operatortype_append(FILE_OT_rename);
 	WM_operatortype_append(FILE_OT_smoothscroll);
+	WM_operatortype_append(FILE_OT_filepath_drop);
 }
 
 /* NOTE: do not add .blend file reading on this level */
@@ -661,6 +662,30 @@ static void file_ui_area_listener(bScreen *UNUSED(sc), ScrArea *UNUSED(sa), AReg
 	}
 }
 
+static int filepath_drop_poll(bContext *C, wmDrag *drag, const wmEvent *UNUSED(event))
+{
+	if (drag->type == WM_DRAG_PATH) {
+		SpaceFile *sfile = CTX_wm_space_file(C);
+		if (sfile) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static void filepath_drop_copy(wmDrag *drag, wmDropBox *drop)
+{
+	RNA_string_set(drop->ptr, "filepath", drag->path);
+}
+
+/* region dropbox definition */
+static void file_dropboxes(void)
+{
+	ListBase *lb = WM_dropboxmap_find("Window", SPACE_EMPTY, RGN_TYPE_WINDOW);
+
+	WM_dropbox_add(lb, "FILE_OT_filepath_drop", filepath_drop_poll, filepath_drop_copy);
+}
+
 /* only called once, from space/spacetypes.c */
 void ED_spacetype_file(void)
 {
@@ -679,7 +704,8 @@ void ED_spacetype_file(void)
 	st->listener = file_listener;
 	st->operatortypes = file_operatortypes;
 	st->keymap = file_keymap;
-	
+	st->dropboxes = file_dropboxes;
+
 	/* regions: main window */
 	art = MEM_callocN(sizeof(ARegionType), "spacetype file region");
 	art->regionid = RGN_TYPE_WINDOW;