forked from mirrors/gecko-dev
cba747de45
Our telemetry data showed `WinUtils::GetNSWindowPtr` returned nullptr when constructing `TaskbarTabPreview`. We can't find a way to make such a situation, but these crashes tell us we should not assume `GetNSWindowPtr` always returns a valid pointer. A proposed fix is to change the return value of `GetWindowHook()` from a reference to a pointer so that the caller can decide what to do when nullptr is returned. Differential Revision: https://phabricator.services.mozilla.com/D91471
70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
/* vim: se cin sw=2 ts=2 et : */
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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 __mozilla_widget_TaskbarTabPreview_h__
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#define __mozilla_widget_TaskbarTabPreview_h__
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#include "nsITaskbarTabPreview.h"
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#include "TaskbarPreview.h"
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namespace mozilla {
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namespace widget {
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class TaskbarTabPreview : public nsITaskbarTabPreview, public TaskbarPreview {
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virtual ~TaskbarTabPreview();
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public:
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TaskbarTabPreview(ITaskbarList4* aTaskbar,
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nsITaskbarPreviewController* aController, HWND aHWND,
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nsIDocShell* aShell);
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virtual nsresult Init() override;
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NS_DECL_ISUPPORTS
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NS_DECL_NSITASKBARTABPREVIEW
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NS_FORWARD_NSITASKBARPREVIEW(TaskbarPreview::)
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private:
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virtual nsresult ShowActive(bool active);
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virtual HWND& PreviewWindow();
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virtual LRESULT WndProc(UINT nMsg, WPARAM wParam, LPARAM lParam);
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static LRESULT CALLBACK GlobalWndProc(HWND hWnd, UINT nMsg, WPARAM wParam,
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LPARAM lParam);
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virtual nsresult UpdateTaskbarProperties();
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virtual nsresult Enable();
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virtual nsresult Disable();
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virtual void DetachFromNSWindow();
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// WindowHook procedure for hooking mWnd
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static bool MainWindowHook(void* aContext, HWND hWnd, UINT nMsg,
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WPARAM wParam, LPARAM lParam, LRESULT* aResult);
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// Bug 520807 - we need to update the proxy window style based on the main
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// window's style to workaround a bug with the way the DWM displays the
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// previews.
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void UpdateProxyWindowStyle();
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nsresult UpdateTitle();
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nsresult UpdateIcon();
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nsresult UpdateNext();
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// Handle to the toplevel proxy window
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HWND mProxyWindow;
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nsString mTitle;
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nsCOMPtr<imgIContainer> mIconImage;
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// Cached Windows icon of mIconImage
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HICON mIcon;
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// Preview that follows this preview in the taskbar (left-to-right order)
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nsCOMPtr<nsITaskbarTabPreview> mNext;
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// True if this preview has been registered with the taskbar
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bool mRegistered;
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};
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} // namespace widget
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} // namespace mozilla
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#endif /* __mozilla_widget_TaskbarTabPreview_h__ */
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