MacPDF: Add a toolbar with a standard sidebar button

Meta/Lagom/Contrib/MacPDF/MacPDFWindowController.h

@@ -15,7 +15,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @class MacPDFDocument;
 
-@interface MacPDFWindowController : NSWindowController <MacPDFViewDelegate>
+@interface MacPDFWindowController : NSWindowController <MacPDFViewDelegate, NSToolbarDelegate>
 
 - (instancetype)initWithDocument:(MacPDFDocument*)document;
 - (IBAction)showGoToPageDialog:(id)sender;

Meta/Lagom/Contrib/MacPDF/MacPDFWindowController.mm

@@ -32,6 +32,11 @@
     window.contentView = _pdfView;
     [_pdfView setDelegate:self];
 
+    NSToolbar* toolbar = [[NSToolbar alloc] initWithIdentifier:@"MacPDFToolbar"];
+    toolbar.delegate = self;
+    toolbar.displayMode = NSToolbarDisplayModeIconOnly;
+    [window setToolbar:toolbar];
+
     _pdfDocument = document;
     return self;
 }
@@ -73,4 +78,25 @@
                      [NSString stringWithFormat:@"Page %d of %d", [_pdfView page], _pdfDocument.pdf->get_page_count()]];
 }
 
+#pragma mark - NSToolbarDelegate
+
+- (NSArray<NSToolbarItemIdentifier>*)toolbarAllowedItemIdentifiers:(NSToolbar*)toolbar
+{
+    return [self toolbarDefaultItemIdentifiers:toolbar];
+}
+
+- (NSArray<NSToolbarItemIdentifier>*)toolbarDefaultItemIdentifiers:(NSToolbar*)toolbar
+{
+    return @[ NSToolbarToggleSidebarItemIdentifier ];
+}
+
+- (NSToolbarItem*)toolbar:(NSToolbar*)toolbar
+        itemForItemIdentifier:(NSToolbarItemIdentifier)itemIdentifier
+    willBeInsertedIntoToolbar:(BOOL)flag
+{
+    // Not called for standard identifiers, but the implementation of the method must exist, or else:
+    // ERROR: invalid delegate <MacPDFWindowController: 0x600003054c80> (does not implement all required methods)
+    return nil;
+}
+
 @end