Accessing active layer from Palette plugin

danielgamage · September 28, 2016, 9:48am

Working in objC, I’m trying to find the active layer for a palette plugin. I’m not positive which class to access it through, though.

It seems like rather than accessing it through the editViewController, I should be using the activeLayer method from windowController in GSWindowControllerProtocol.h, via GlyphsPaletteProtocol.h. I can’t seem to make that work, though. As the code is below, windowController is null. Does it need to be more explicitly imported?

Here’s the relevant code if that’s helpful:

github.com

danielgamage/SelectionPalette/blob/master/SelectionPalette/SelectionPalette.m#L23


#import <GlyphsCore/GSLayer.h>
#import <GlyphsCore/GSPath.h>
#import <GlyphsCore/GSElement.h>
#import <GlyphsCore/GSNode.h>
#import <GlyphsCore/GSWindowControllerProtocol.h>


@interface NSApplication (FontDocument)
- (NSDocument*)currentFontDocument;
@end


@implementation SelectionPalette


@synthesize windowController;


- (id) init {
self = [super init];
[NSBundle loadNibNamed:@"SelectionPaletteView" owner:self];
[self addMenuItems];
return self;
}

GeorgSeifert · September 28, 2016, 9:40pm

The windowController is not set when the object in instantiated. You need to add a callback to be notified if something has changed. you can do that like this in -(id)init:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(update:) name:@"GSUpdateInterface" object:nil];

Then you implement:

- (void)update:(id)sender {
    layer = [windowController activeLayer];
    ...
}