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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_plugins_PluginHangUIParent_h
#define mozilla_plugins_PluginHangUIParent_h
#include "nsString.h"
#include "base/process.h"
#include "base/process_util.h"
#include "mozilla/Mutex.h"
#include "mozilla/plugins/PluginMessageUtils.h"
#include "MiniShmParent.h"
namespace mozilla {
namespace plugins {
class PluginModuleChromeParent;
/**
* This class is responsible for launching and communicating with the
* plugin-hang-ui process.
*
* NOTE: PluginHangUIParent is *not* an IPDL actor! In this case, "Parent"
* is describing the fact that firefox is the parent process to the
* plugin-hang-ui process, which is the PluginHangUIChild.
* PluginHangUIParent and PluginHangUIChild are a matched pair.
* @see PluginHangUIChild
*/
class PluginHangUIParent : public MiniShmObserver
{
public:
PluginHangUIParent(PluginModuleChromeParent* aModule,
const int32_t aHangUITimeoutPref,
const int32_t aChildTimeoutPref);
virtual ~PluginHangUIParent();
/**
* Spawn the plugin-hang-ui.exe child process and terminate the given
* plugin container process if the user elects to stop the hung plugin.
*
* @param aPluginName Human-readable name of the affected plugin.
* @return true if the plugin hang ui process was successfully launched,
* otherwise false.
*/
bool
Init(const nsString& aPluginName);
/**
* If the Plugin Hang UI is being shown, send a cancel notification to the
* Plugin Hang UI child process.
*
* @return true if the UI was shown and the cancel command was successfully
* sent to the child process, otherwise false.
*/
bool
Cancel();
/**
* Returns whether the Plugin Hang UI is currently being displayed.
*
* @return true if the Plugin Hang UI is showing, otherwise false.
*/
bool
IsShowing() const { return mIsShowing; }
/**
* Returns whether this Plugin Hang UI instance has been shown. Note
* that this does not necessarily mean that the UI is showing right now.
*
* @return true if the Plugin Hang UI has shown, otherwise false.
*/
bool
WasShown() const { return mIsShowing || mLastUserResponse != 0; }
/**
* Returns whether the user checked the "Don't ask me again" checkbox.
*
* @return true if the user does not want to see the Hang UI again.
*/
bool
DontShowAgain() const;
/**
* Returns whether the user clicked stop during the last time that the
* Plugin Hang UI was displayed, if applicable.
*
* @return true if the UI was shown and the user chose to stop the
* plugin, otherwise false
*/
bool
WasLastHangStopped() const;
/**
* @return unsigned int containing the response bits from the last
* time the Plugin Hang UI ran.
*/
unsigned int
LastUserResponse() const { return mLastUserResponse; }
/**
* @return unsigned int containing the number of milliseconds that
* the Plugin Hang UI was displayed before the user responded.
* Returns 0 if the Plugin Hang UI has not been shown or was cancelled.
*/
unsigned int
LastShowDurationMs() const;
virtual void
OnMiniShmEvent(MiniShmBase* aMiniShmObj) override;
virtual void
OnMiniShmConnect(MiniShmBase* aMiniShmObj) override;
private:
nsresult
GetHangUIOwnerWindowHandle(NativeWindowHandle& windowHandle);
bool
SendCancel();
bool
RecvUserResponse(const unsigned int& aResponse);
bool
UnwatchHangUIChildProcess(bool aWait);
static
VOID CALLBACK SOnHangUIProcessExit(PVOID aContext, BOOLEAN aIsTimer);
private:
Mutex mMutex;
PluginModuleChromeParent* mModule;
const uint32_t mTimeoutPrefMs;
const uint32_t mIPCTimeoutMs;
MessageLoop* mMainThreadMessageLoop;
bool mIsShowing;
unsigned int mLastUserResponse;
base::ProcessHandle mHangUIProcessHandle;
NativeWindowHandle mMainWindowHandle;
HANDLE mRegWait;
HANDLE mShowEvent;
DWORD mShowTicks;
DWORD mResponseTicks;
MiniShmParent mMiniShm;
DISALLOW_COPY_AND_ASSIGN(PluginHangUIParent);
};
} // namespace plugins
} // namespace mozilla
#endif // mozilla_plugins_PluginHangUIParent_h
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