зеркало из https://github.com/mozilla/gecko-dev.git
56 строки
2.4 KiB
Objective-C
56 строки
2.4 KiB
Objective-C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZMenuOpeningCoordinator_h
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#define MOZMenuOpeningCoordinator_h
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#import <Cocoa/Cocoa.h>
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#include "mozilla/RefPtr.h"
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namespace mozilla {
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class Runnable;
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}
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/*
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* MOZMenuOpeningCoordinator is a workaround for the fact that opening an NSMenu creates a nested
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* event loop. This event loop is only exited after the menu is closed. The caller of
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* NativeMenuMac::ShowAsContextMenu does not expect ShowAsContextMenu to create a nested event loop,
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* so we need to make sure to open the NSMenu asynchronously.
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*/
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@interface MOZMenuOpeningCoordinator : NSObject
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+ (instancetype)sharedInstance;
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// Queue aMenu for opening.
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// The menu will open from a new event loop tick so that its nested event loop does not block the
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// caller. If another menu's nested event loop is currently on the stack, we wait for that nested
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// event loop to unwind before opening aMenu. Returns a handle that can be passed to
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// cancelAsynchronousOpening:. Can only be called on the main thread.
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- (NSInteger)asynchronouslyOpenMenu:(NSMenu*)aMenu
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atScreenPosition:(NSPoint)aPosition
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forView:(NSView*)aView;
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// If the menu opening request for aHandle hasn't been processed yet, cancel it.
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// Can only be called on the main thread.
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- (void)cancelAsynchronousOpening:(NSInteger)aHandle;
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// Run aRunnable once the nested event loop of the currently open menu has been exited.
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// If no menu is currently open, post the runnable with NS_DispatchToCurrentThread.
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- (void)runAfterMenuClosed:(RefPtr<mozilla::Runnable>&&)aRunnable;
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// This field is a terrible workaround for a gnarly problem.
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// It should be set to YES by the caller of -[NSMenu cancelTracking(WithoutAnimation)].
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// This field gets checked by the native event loop code in nsAppShell.mm to avoid calling
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// -[NSApplication nextEventMatchingMask:...] between the call to cancelTracking and the point at
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// which the menu has finished closing and unwound from its tracking event loop, because such calls
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// can interfere with menu closing and get us stuck in the menu event loop forever.
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@property(class) BOOL needToUnwindForMenuClosing;
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@end
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#endif // MOZMenuOpeningCoordinator_h
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