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_TAB_CLOSEABLE_STATE_WATCHER_H_ 6 #define CHROME_BROWSER_TAB_CLOSEABLE_STATE_WATCHER_H_ 7 #pragma once 8 9 #include "base/basictypes.h" 10 11 class Browser; 12 13 // Base class for watching closeable state of tabs, which always returns true 14 // to allow closing for all tabs and browsers. Classes that desire otherwise 15 // can inherit this class and override the methods as deemed appropriate to 16 // allow or disallow tabs or browsers to be closed. 17 18 class TabCloseableStateWatcher { 19 public: TabCloseableStateWatcher()20 TabCloseableStateWatcher() {} ~TabCloseableStateWatcher()21 virtual ~TabCloseableStateWatcher() {} 22 23 // Creates the appropriate TabCloseableStateWatcher. The caller owns the 24 // returned object. 25 static TabCloseableStateWatcher* Create(); 26 27 // Called from Browser::CanCloseTab which overrides TabStripModelDelegate:: 28 // CanCloseTab, and returns true if tab of browser is closeable. 29 // Browser::CanCloseTab is in turn called by Browser, TabStripModel and 30 // BrowserTabStripController when: 31 // - rendering tab to determine if close button should be drawn 32 // - setting up tab's context menu to determine if "Close tab" should 33 // should be enabled 34 // - determining if accelerator keys to close tab should be processed 35 virtual bool CanCloseTab(const Browser* browser) const; 36 37 // Called from Browser::IsClosingPermitted which is in turn called from 38 // Browser::ShouldCloseWindow to check if |browser| can be closed. 39 virtual bool CanCloseBrowser(Browser* browser); 40 41 // Called from Browser::CancelWindowClose when closing of window is canceled. 42 // Watcher is potentially interested in this, especially when the closing of 43 // window was initiated by application exiting. OnWindowCloseCanceled(Browser * browser)44 virtual void OnWindowCloseCanceled(Browser* browser) {} 45 46 private: 47 DISALLOW_COPY_AND_ASSIGN(TabCloseableStateWatcher); 48 }; 49 50 #endif // CHROME_BROWSER_TAB_CLOSEABLE_STATE_WATCHER_H_ 51