From 31d4006d7793100435aaf331f5e48e2762656ca9 Mon Sep 17 00:00:00 2001
From: Bjorn Winckler <bjorn.winckler@gmail.com>
Date: Mon, 6 Aug 2007 13:23:35 +0000
Subject: [PATCH] Added rudimentary support for drag and drop of files on
 window.

git-svn-id: http://macvim.googlecode.com/svn/trunk@90 96c4425d-ca35-0410-94e5-3396d5c13a8f
---
 MMBackend.m  | 55 ++++++++++++++++++++++++++++++++++++++++
 MMTextView.m | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 MacVim.h     |  1 +
 3 files changed, 127 insertions(+)

diff --git a/MMBackend.m b/MMBackend.m
index c30214419a..b82e17a117 100644
--- a/MMBackend.m
+++ b/MMBackend.m
@@ -1075,6 +1075,61 @@ static int specialKeyToNSKey(int key);
         }
     } else if (VimShouldCloseMsgID == msgid) {
         gui_shell_closed();
+    } else if (DropFilesMsgID == msgid) {
+#ifdef FEAT_DND
+        const void *bytes = [data bytes];
+        int n = *((int*)bytes);  bytes += sizeof(int);
+
+#if 0
+        int row = *((int*)bytes);  bytes += sizeof(int);
+        int col = *((int*)bytes);  bytes += sizeof(int);
+
+	char_u **fnames = (char_u **)alloc(n * sizeof(char_u *));
+        if (fnames) {
+            const void *end = [data bytes] + [data length];
+            int i = 0;
+            while (bytes < end && i < n) {
+                int len = *((int*)bytes);  bytes += sizeof(int);
+                fnames[i++] = vim_strnsave((char_u*)bytes, len);
+                bytes += len;
+            }
+
+            // NOTE!  This function will free 'fnames'.
+            gui_handle_drop(col, row, 0, fnames, i < n ? i : n);
+        }
+#else
+        // HACK!  I'm not sure how to get Vim to open a list of files in tabs,
+        // so instead I create a ':tab drop' command with all the files to open
+        // and execute it.
+        NSMutableString *cmd = [NSMutableString stringWithString:@":tab drop"];
+
+        const void *end = [data bytes] + [data length];
+        int i;
+        for (i = 0; i < n && bytes < end; ++i) {
+            int len = *((int*)bytes);  bytes += sizeof(int);
+            NSString *file = [NSString stringWithUTF8String:bytes];
+            bytes += len;
+
+            [cmd appendString:@" "];
+            [cmd appendString:file];
+        }
+
+        // By going to the last tabpage we ensure that the new tabs will appear
+        // last (if this call is left out, the taborder becomes messy).
+        goto_tabpage(9999);
+
+        do_cmdline_cmd((char_u*)[cmd UTF8String]);
+
+#if 1
+        // This code was taken from the end of gui_handle_drop().
+	update_screen(NOT_VALID);
+	setcursor();
+	out_flush();
+	gui_update_cursor(FALSE, FALSE);
+	gui_mch_flush();
+#endif
+#endif
+#endif // FEAT_DND
     } else {
         NSLog(@"WARNING: Unknown message received (msgid=%d)", msgid);
     }
diff --git a/MMTextView.m b/MMTextView.m
index fbe3990c77..a373079cf4 100644
--- a/MMTextView.m
+++ b/MMTextView.m
@@ -259,6 +259,77 @@
 }
 #endif
 
+#if 1
+- (NSArray *)acceptableDragTypes
+{
+    return [NSArray arrayWithObjects:NSFilenamesPboardType, nil];
+}
+
+- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
+{
+    NSPasteboard *pboard = [sender draggingPasteboard];
+
+    if ( [[pboard types] containsObject:NSFilenamesPboardType] ) {
+        NSArray *files = [pboard propertyListForType:NSFilenamesPboardType];
+        int i, numberOfFiles = [files count];
+        NSMutableData *data = [NSMutableData data];
+
+        [data appendBytes:&numberOfFiles length:sizeof(int)];
+
+#if 0
+        int row, col;
+        NSPoint pt = [self convertPoint:[sender draggingLocation] fromView:nil];
+        if (![self convertPoint:pt toRow:&row column:&col])
+            return NO;
+
+        [data appendBytes:&row length:sizeof(int)];
+        [data appendBytes:&col length:sizeof(int)];
+#endif
+
+        for (i = 0; i < numberOfFiles; ++i) {
+            NSString *file = [files objectAtIndex:i];
+            int len = [file lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
+
+            if (len > 0) {
+                ++len;  // append NUL as well
+                [data appendBytes:&len length:sizeof(int)];
+                [data appendBytes:[file UTF8String] length:len];
+            }
+        }
+
+        [[self vimController] sendMessage:DropFilesMsgID data:data wait:NO];
+        return YES;
+    }
+
+    return NO;
+}
+
+- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
+{
+    NSDragOperation sourceDragMask = [sender draggingSourceOperationMask];
+    NSPasteboard *pboard = [sender draggingPasteboard];
+
+    if ( [[pboard types] containsObject:NSFilenamesPboardType]
+            && (sourceDragMask & NSDragOperationCopy) )
+        return NSDragOperationCopy;
+
+    return NSDragOperationNone;
+}
+
+- (NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)sender
+{
+    NSDragOperation sourceDragMask = [sender draggingSourceOperationMask];
+    NSPasteboard *pboard = [sender draggingPasteboard];
+
+    if ( [[pboard types] containsObject:NSFilenamesPboardType]
+            && (sourceDragMask & NSDragOperationCopy) )
+        return NSDragOperationCopy;
+
+    return NSDragOperationNone;
+}
+
+#endif
+
 @end // MMTextView
 
 
diff --git a/MacVim.h b/MacVim.h
index 187ab7af9d..f0032b7ac4 100644
--- a/MacVim.h
+++ b/MacVim.h
@@ -90,6 +90,7 @@ enum {
     VimShouldCloseMsgID,
     SetDefaultColorsMsgID,
     ExecuteActionMsgID,
+    DropFilesMsgID,
 };