1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_UI_COCOA_WRENCH_MENU_MENU_TRACKED_BUTTON_H_ 6 #define CHROME_BROWSER_UI_COCOA_WRENCH_MENU_MENU_TRACKED_BUTTON_H_ 7 8 #import <Cocoa/Cocoa.h> 9 10 // A MenuTrackedButton is meant to be used whenever a button is placed inside 11 // the custom view of an NSMenuItem. If the user opens the menu in a non-sticky 12 // fashion (i.e. clicks, holds, and drags) and then releases the mouse over 13 // a MenuTrackedButton, it will |-performClick:| itself. 14 // 15 // To create the hover state effects, there are two code paths. When the menu 16 // is opened sticky, a tracking rect produces mouse entered/exit events that 17 // allow for setting the cell's highlight property. When in a drag cycle, 18 // however, the only event received is |-mouseDragged:|. Therefore, a 19 // delayed selector is scheduled to poll the mouse location after each drag 20 // event. This checks if the user is still over the button after the drag 21 // events stop being sent, indicating either the user is hovering without 22 // movement or that the mouse is no longer over the receiver. 23 @interface MenuTrackedButton : NSButton { 24 @private 25 // If the button received a |-mouseEntered:| event. This short-circuits the 26 // custom drag tracking logic. 27 BOOL didEnter_; 28 29 // Whether or not the user is in a click-drag-release event sequence. If so 30 // and this receives a |-mouseUp:|, then this will click itself. 31 BOOL tracking_; 32 33 // In order to get hover effects when the menu is sticky-opened, a tracking 34 // rect needs to be installed on the button. 35 NSTrackingRectTag trackingTag_; 36 } 37 38 @property(nonatomic, readonly, getter=isTracking) BOOL tracking; 39 40 @end 41 42 #endif // CHROME_BROWSER_UI_COCOA_WRENCH_MENU_MENU_TRACKED_BUTTON_H_ 43
