qt-everywhere-src-5.14.1/qtbase/src/plugins/platforms/cocoa/qnsview_menus.mm

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// This file is included from qnsview.mm, and only used to organize the code

#include <qcocoaapplicationdelegate.h>
#include <qcocoansmenu.h>
#include <qcocoamenuitem.h>
#include <qcocoamenu.h>
#include <qcocoamenubar.h>

static bool selectorIsCutCopyPaste(SEL selector)
{
    return (selector == @selector(cut:)
            || selector == @selector(copy:)
            || selector == @selector(paste:)
            || selector == @selector(selectAll:));
}

@interface QNSView (Menus)
- (void)qt_itemFired:(QCocoaNSMenuItem *)item;
@end

@implementation QNSView (Menus)

- (BOOL)validateMenuItem:(NSMenuItem*)item
{
    auto *nativeItem = qt_objc_cast<QCocoaNSMenuItem *>(item);
    if (!nativeItem)
        return item.enabled; // FIXME Test with with Qt as plugin or embedded QWindow.

    auto *platformItem = nativeItem.platformMenuItem;
    if (!platformItem)
        return NO;

    // Menu-holding items are always enabled, as it's conventional in Cocoa
    if (platformItem->menu())
        return YES;

    // Check if a modal dialog is active. Validate only menu
    // items belonging to this view's window own menu bar.
    if (QGuiApplication::modalWindow()) {
        QCocoaMenuBar *menubar = nullptr;

        QObject *menuParent = platformItem->menuParent();
        while (menuParent && !(menubar = qobject_cast<QCocoaMenuBar *>(menuParent))) {
            auto *menuObject = dynamic_cast<QCocoaMenuObject *>(menuParent);
            menuParent = menuObject->menuParent();
        }

        if (menubar && menubar->cocoaWindow() != self.platformWindow)
            return NO;
    }

    return platformItem->isEnabled();
}

- (BOOL)respondsToSelector:(SEL)selector
{
    // Not exactly true. Both copy: and selectAll: can work on non key views.
    if (selectorIsCutCopyPaste(selector))
        return ([NSApp keyWindow] == self.window) && (self.window.firstResponder == self);

    return [super respondsToSelector:selector];
}

- (void)qt_itemFired:(QCocoaNSMenuItem *)item
{
    auto *appDelegate = [QCocoaApplicationDelegate sharedDelegate];
    [appDelegate qt_itemFired:item];
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector
{
    if (selectorIsCutCopyPaste(selector)) {
        NSMethodSignature *itemFiredSign = [super methodSignatureForSelector:@selector(qt_itemFired:)];
        return itemFiredSign;
    }

    return [super methodSignatureForSelector:selector];
}

- (void)forwardInvocation:(NSInvocation *)invocation
{
    if (selectorIsCutCopyPaste(invocation.selector)) {
        NSObject *sender;
        [invocation getArgument:&sender atIndex:2];
        if (auto *nativeItem = qt_objc_cast<QCocoaNSMenuItem *>(sender)) {
            [self qt_itemFired:nativeItem];
            return;
        }
    }

    [super forwardInvocation:invocation];
}

@end