How does MacVim enable ⌘A for the call to NSOpenPanel

[Jeff Holt]

I'm looking at the source for the fileOpen method and I cannot figure out how it tells NSOpenPanel to respect ⌘A to select all files in the dialog.

Does anyone know how it's done?

[Yee Cheng Chin]

It's done in MMAppController.m's fileOpen: method. I think you just need to enable "allowsMultipleSelection" (https://developer.apple.com/documentation/appkit/nsopenpanel/1530786-allowsmultipleselection) if you are trying to debug your own app.

On Wed, Jan 31, 2024 at 2:00 PM Jeff Holt <jeffrey...@gmail.com> wrote:

I'm looking at the source for the fileOpen method and I cannot figure out how it tells NSOpenPanel to respect ⌘A to select all files in the dialog.

Does anyone know how it's done?

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[Jeff Holt]

The code I wrote does indeed set that attribute to true but ⌘ A is not working. Here's my MCV example that does everything except allow me to select all items. BTW, if I use "true" instead of "YES", then it behaves the same way.

Multiple selections work but it won't let me select all. I would have expected select all to work even in the context below.

#import <Cocoa/Cocoa.h>

void openDialog () {
    @try {
        NSOpenPanel *panel = [NSOpenPanel openPanel];
        [panel setCanChooseFiles:YES];
        [panel setCanChooseDirectories:YES];
        [panel setAllowsMultipleSelection:YES];
        if ([panel runModal] == NSModalResponseOK) {
            for ( NSURL* URL in [panel URLs] ) {
                NSLog( @"%@", [URL path] );
            }
        } else {
            NSLog( @"ok button not pressed");
        }
    } @catch (NSException *exception) {
        NSLog(@"%@", [exception callStackSymbols]);
    }
}

void setup () {
    NSWindow *myWindow;
    NSRect    graphicsRect = NSMakeRect(100.0, 350.0, 400.0, 400.0);

    myWindow = [ [NSWindow alloc]
               initWithContentRect: graphicsRect
                         styleMask:NSWindowStyleMaskTitled
                                  |NSWindowStyleMaskClosable
                                  |NSWindowStyleMaskMiniaturizable
                           backing:NSBackingStoreBuffered
                             defer:NO ];

    [myWindow setTitle:@"Open File App"];
    [myWindow makeKeyAndOrderFront: nil];
openDialog();
}

int main (  ) {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSApp = [NSApplication sharedApplication];
    setup();
    [NSApp run];
    [NSApp release];
    [pool release];
    return(EXIT_SUCCESS);
}

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[Yee Cheng Chin]

Sorry, I'm not sure then. Feel free to debug MacVim itself and see if you could bridge the difference to see why the two work differently. The code is in MMAppController.m's fileOpen: method as I mentioned.

It's also possible that your app is eating the Cmd-A somehow. You should make sure nothing in your app is doing key handling just for testing.

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