Add support to drop files on OS X window (fix #605)

src/she/osx/app_delegate.mm

@@ -16,6 +16,7 @@
 #include "she/event.h"
 #include "she/event_queue.h"
 #include "she/osx/app.h"
+#include "she/osx/generate_drop_files.h"
 #include "she/system.h"
 
 @implementation OSXAppDelegate
@@ -39,16 +40,7 @@
 
 - (BOOL)application:(NSApplication*)app openFiles:(NSArray*)filenames
 {
-  std::vector<std::string> files;
-  for (int i=0; i<[filenames count]; ++i) {
-    NSString* fn = [filenames objectAtIndex: i];
-    files.push_back(base::normalize_path([fn UTF8String]));
-  }
-
-  she::Event ev;
-  ev.setType(she::Event::DropFiles);
-  ev.setFiles(files);
-  she::queue_event(ev);
+  generate_drop_files_from_nsarray(filenames);
 
   [app replyToOpenOrPrint:NSApplicationDelegateReplySuccess];
   return YES;

src/she/osx/generate_drop_files.h

@@ -0,0 +1,27 @@
+// SHE library
+// Copyright (C) 2016  David Capello
+//
+// This file is released under the terms of the MIT license.
+// Read LICENSE.txt for more information.
+
+#ifndef SHE_OSX_APP_GENERATE_DROP_FILES_H_INCLUDED
+#define SHE_OSX_APP_GENERATE_DROP_FILES_H_INCLUDED
+#pragma once
+
+#include "base/path.h"
+
+inline void generate_drop_files_from_nsarray(NSArray* filenames)
+{
+  std::vector<std::string> files;
+  for (int i=0; i<[filenames count]; ++i) {
+    NSString* fn = [filenames objectAtIndex: i];
+    files.push_back(base::normalize_path([fn UTF8String]));
+  }
+
+  she::Event ev;
+  ev.setType(she::Event::DropFiles);
+  ev.setFiles(files);
+  she::queue_event(ev);
+}
+
+#endif

src/she/osx/view.h

@@ -50,6 +50,8 @@
 - (void)createMouseTrackingArea;
 - (void)destroyMouseTrackingArea;
 - (void)updateCurrentCursor;
+- (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender;
+- (BOOL)performDragOperation:(id<NSDraggingInfo>)sender;
 @end
 
 #endif

src/she/osx/view.mm

@@ -14,6 +14,7 @@
 #include "she/event.h"
 #include "she/event_queue.h"
 #include "she/keys.h"
+#include "she/osx/generate_drop_files.h"
 #include "she/osx/window.h"
 
 using namespace she;
@@ -97,6 +98,10 @@ bool is_key_pressed(KeyScancode scancode)
   self = [super initWithFrame:frameRect];
   if (self != nil) {
     [self createMouseTrackingArea];
+    [self registerForDraggedTypes:
+      [NSArray arrayWithObjects:
+        NSFilenamesPboardType,
+        nil]];
   }
   return self;
 }
@@ -466,4 +471,22 @@ bool is_key_pressed(KeyScancode scancode)
   }
 }
 
+- (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender
+{
+  return NSDragOperationCopy;
+}
+
+- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
+{
+  NSPasteboard* pasteboard = [sender draggingPasteboard];
+
+  if ([pasteboard.types containsObject:NSFilenamesPboardType]) {
+    NSArray* filenames = [pasteboard propertyListForType:NSFilenamesPboardType];
+    generate_drop_files_from_nsarray(filenames);
+    return YES;
+  }
+  else
+    return NO;
+}
+
 @end