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gecko-dev/dom/plugins/base/nsPluginNativeWindowWin.cpp
Jacek Caban 116352d107 Bug 849198 - Merge nsPluginSafety.h into nsNPAPIPluginInstance.h r=roc 
--HG--
extra : rebase_source : b5e71211edce0b30f92033010d47b9a303f2c3bf
2013-03-12 11:34:07 +01:00

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/* -*- Mode: C++; tab-width: 2; 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/. */
#include "mozilla/DebugOnly.h"
#include "windows.h"
#include "windowsx.h"
// XXXbz windowsx.h defines GetFirstChild, GetNextSibling,
// GetPrevSibling are macros, apparently... Eeevil. We have functions
// called that on some classes, so undef them.
#undef GetFirstChild
#undef GetNextSibling
#undef GetPrevSibling
#include "nsDebug.h"
#include "nsGUIEvent.h"
#include "nsWindowsDllInterceptor.h"
#include "nsPluginNativeWindow.h"
#include "nsThreadUtils.h"
#include "nsAutoPtr.h"
#include "nsTWeakRef.h"
#include "nsCrashOnException.h"
using namespace mozilla;
#define NP_POPUP_API_VERSION 16
#define nsMajorVersion(v) (((int32_t)(v) >> 16) & 0xffff)
#define nsMinorVersion(v) ((int32_t)(v) & 0xffff)
#define versionOK(suppliedV, requiredV) \
(nsMajorVersion(suppliedV) == nsMajorVersion(requiredV) \
&& nsMinorVersion(suppliedV) >= nsMinorVersion(requiredV))
#define NS_PLUGIN_WINDOW_PROPERTY_ASSOCIATION TEXT("MozillaPluginWindowPropertyAssociation")
#define NS_PLUGIN_CUSTOM_MSG_ID TEXT("MozFlashUserRelay")
#define WM_USER_FLASH WM_USER+1
static UINT sWM_FLASHBOUNCEMSG = 0;
typedef nsTWeakRef<class nsPluginNativeWindowWin> PluginWindowWeakRef;
/**
* PLEvent handling code
*/
class PluginWindowEvent : public nsRunnable {
public:
PluginWindowEvent();
void Init(const PluginWindowWeakRef &ref, HWND hWnd, UINT msg, WPARAM wParam,
LPARAM lParam);
void Clear();
HWND GetWnd() { return mWnd; };
UINT GetMsg() { return mMsg; };
WPARAM GetWParam() { return mWParam; };
LPARAM GetLParam() { return mLParam; };
bool InUse() { return (mWnd!=NULL); };
NS_DECL_NSIRUNNABLE
protected:
PluginWindowWeakRef mPluginWindowRef;
HWND mWnd;
UINT mMsg;
WPARAM mWParam;
LPARAM mLParam;
};
PluginWindowEvent::PluginWindowEvent()
{
Clear();
}
void PluginWindowEvent::Clear()
{
mWnd = NULL;
mMsg = 0;
mWParam = 0;
mLParam = 0;
}
void PluginWindowEvent::Init(const PluginWindowWeakRef &ref, HWND aWnd,
UINT aMsg, WPARAM aWParam, LPARAM aLParam)
{
NS_ASSERTION(aWnd != NULL, "invalid plugin event value");
NS_ASSERTION(mWnd == NULL, "event already in use");
mPluginWindowRef = ref;
mWnd = aWnd;
mMsg = aMsg;
mWParam = aWParam;
mLParam = aLParam;
}
/**
* nsPluginNativeWindow Windows specific class declaration
*/
typedef enum {
nsPluginType_Unknown = 0,
nsPluginType_Flash,
nsPluginType_Real,
nsPluginType_PDF,
nsPluginType_Other
} nsPluginType;
class nsPluginNativeWindowWin : public nsPluginNativeWindow {
public:
nsPluginNativeWindowWin();
virtual ~nsPluginNativeWindowWin();
virtual nsresult CallSetWindow(nsRefPtr<nsNPAPIPluginInstance> &aPluginInstance);
private:
nsresult SubclassAndAssociateWindow();
nsresult UndoSubclassAndAssociateWindow();
public:
// locals
WNDPROC GetPrevWindowProc();
void SetPrevWindowProc(WNDPROC proc) { mPluginWinProc = proc; }
WNDPROC GetWindowProc();
PluginWindowEvent * GetPluginWindowEvent(HWND aWnd,
UINT aMsg,
WPARAM aWParam,
LPARAM aLParam);
private:
WNDPROC mPluginWinProc;
WNDPROC mPrevWinProc;
PluginWindowWeakRef mWeakRef;
nsRefPtr<PluginWindowEvent> mCachedPluginWindowEvent;
HWND mParentWnd;
LONG_PTR mParentProc;
public:
nsPluginType mPluginType;
};
static bool sInMessageDispatch = false;
static bool sInPreviousMessageDispatch = false;
static UINT sLastMsg = 0;
static bool ProcessFlashMessageDelayed(nsPluginNativeWindowWin * aWin, nsNPAPIPluginInstance * aInst,
HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
NS_ENSURE_TRUE(aWin, false);
NS_ENSURE_TRUE(aInst, false);
if (msg == sWM_FLASHBOUNCEMSG) {
// See PluginWindowEvent::Run() below.
NS_ASSERTION((sWM_FLASHBOUNCEMSG != 0), "RegisterWindowMessage failed in flash plugin WM_USER message handling!");
::CallWindowProc((WNDPROC)aWin->GetWindowProc(), hWnd, WM_USER_FLASH, wParam, lParam);
return true;
}
if (msg != WM_USER_FLASH)
return false; // no need to delay
// do stuff
nsCOMPtr<nsIRunnable> pwe = aWin->GetPluginWindowEvent(hWnd, msg, wParam, lParam);
if (pwe) {
NS_DispatchToCurrentThread(pwe);
return true;
}
return false;
}
class nsDelayedPopupsEnabledEvent : public nsRunnable
{
public:
nsDelayedPopupsEnabledEvent(nsNPAPIPluginInstance *inst)
: mInst(inst)
{}
NS_DECL_NSIRUNNABLE
private:
nsRefPtr<nsNPAPIPluginInstance> mInst;
};
NS_IMETHODIMP nsDelayedPopupsEnabledEvent::Run()
{
mInst->PushPopupsEnabledState(false);
return NS_OK;
}
static LRESULT CALLBACK PluginWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
/**
* New plugin window procedure
*/
static LRESULT CALLBACK PluginWndProcInternal(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
nsPluginNativeWindowWin * win = (nsPluginNativeWindowWin *)::GetProp(hWnd, NS_PLUGIN_WINDOW_PROPERTY_ASSOCIATION);
if (!win)
return TRUE;
// The DispatchEvent(NS_PLUGIN_ACTIVATE) below can trigger a reentrant focus
// event which might destroy us. Hold a strong ref on the plugin instance
// to prevent that, bug 374229.
nsRefPtr<nsNPAPIPluginInstance> inst;
win->GetPluginInstance(inst);
// Real may go into a state where it recursivly dispatches the same event
// when subclassed. If this is Real, lets examine the event and drop it
// on the floor if we get into this recursive situation. See bug 192914.
if (win->mPluginType == nsPluginType_Real) {
if (sInMessageDispatch && msg == sLastMsg)
return true;
// Cache the last message sent
sLastMsg = msg;
}
bool enablePopups = false;
// Activate/deactivate mouse capture on the plugin widget
// here, before we pass the Windows event to the plugin
// because its possible our widget won't get paired events
// (see bug 131007) and we'll look frozen. Note that this
// is also done in ChildWindow::DispatchMouseEvent.
switch (msg) {
case WM_LBUTTONDOWN:
case WM_MBUTTONDOWN:
case WM_RBUTTONDOWN: {
nsCOMPtr<nsIWidget> widget;
win->GetPluginWidget(getter_AddRefs(widget));
if (widget)
widget->CaptureMouse(true);
break;
}
case WM_LBUTTONUP:
enablePopups = true;
// fall through
case WM_MBUTTONUP:
case WM_RBUTTONUP: {
nsCOMPtr<nsIWidget> widget;
win->GetPluginWidget(getter_AddRefs(widget));
if (widget)
widget->CaptureMouse(false);
break;
}
case WM_KEYDOWN:
// Ignore repeating keydown messages...
if ((lParam & 0x40000000) != 0) {
break;
}
// fall through
case WM_KEYUP:
enablePopups = true;
break;
case WM_MOUSEACTIVATE: {
// If a child window of this plug-in is already focused,
// don't focus the parent to avoid focus dance. We'll
// receive a follow up WM_SETFOCUS which will notify
// the appropriate window anyway.
HWND focusedWnd = ::GetFocus();
if (!::IsChild((HWND)win->window, focusedWnd)) {
// Notify the dom / focus manager the plugin has focus when one of
// it's child windows receives it. OOPP specific - this code is
// critical in notifying the dom of focus changes when the plugin
// window in the child process receives focus via a mouse click.
// WM_MOUSEACTIVATE is sent by nsWindow via a custom window event
// sent from PluginInstanceParent in response to focus events sent
// from the child. (bug 540052) Note, this gui event could also be
// sent directly from widget.
nsCOMPtr<nsIWidget> widget;
win->GetPluginWidget(getter_AddRefs(widget));
if (widget) {
nsGUIEvent event(true, NS_PLUGIN_ACTIVATE, widget);
nsEventStatus status;
widget->DispatchEvent(&event, status);
}
}
}
break;
case WM_SETFOCUS:
case WM_KILLFOCUS: {
// RealPlayer can crash, don't process the message for those,
// see bug 328675.
if (win->mPluginType == nsPluginType_Real && msg == sLastMsg)
return TRUE;
// Make sure setfocus and killfocus get through to the widget procedure
// even if they are eaten by the plugin. Also make sure we aren't calling
// recursively.
WNDPROC prevWndProc = win->GetPrevWindowProc();
if (prevWndProc && !sInPreviousMessageDispatch) {
sInPreviousMessageDispatch = true;
::CallWindowProc(prevWndProc, hWnd, msg, wParam, lParam);
sInPreviousMessageDispatch = false;
}
break;
}
}
// Macromedia Flash plugin may flood the message queue with some special messages
// (WM_USER+1) causing 100% CPU consumption and GUI freeze, see mozilla bug 132759;
// we can prevent this from happening by delaying the processing such messages;
if (win->mPluginType == nsPluginType_Flash) {
if (ProcessFlashMessageDelayed(win, inst, hWnd, msg, wParam, lParam))
return TRUE;
}
if (enablePopups && inst) {
uint16_t apiVersion;
if (NS_SUCCEEDED(inst->GetPluginAPIVersion(&apiVersion)) &&
!versionOK(apiVersion, NP_POPUP_API_VERSION)) {
inst->PushPopupsEnabledState(true);
}
}
sInMessageDispatch = true;
LRESULT res;
WNDPROC proc = (WNDPROC)win->GetWindowProc();
if (PluginWndProc == proc) {
NS_WARNING("Previous plugin window procedure references PluginWndProc! "
"Report this bug!");
res = CallWindowProc(DefWindowProc, hWnd, msg, wParam, lParam);
} else {
res = CallWindowProc(proc, hWnd, msg, wParam, lParam);
}
sInMessageDispatch = false;
if (inst) {
// Popups are enabled (were enabled before the call to
// CallWindowProc()). Some plugins (at least the flash player)
// post messages from their key handlers etc that delay the actual
// processing, so we need to delay the disabling of popups so that
// popups remain enabled when the flash player ends up processing
// the actual key handlers. We do this by posting an event that
// does the disabling, this way our disabling will happen after
// the handlers in the plugin are done.
// Note that it's not fatal if any of this fails (which won't
// happen unless we're out of memory anyways) since the plugin
// code will pop any popup state pushed by this plugin on
// destruction.
nsCOMPtr<nsIRunnable> event = new nsDelayedPopupsEnabledEvent(inst);
if (event)
NS_DispatchToCurrentThread(event);
}
return res;
}
static LRESULT CALLBACK PluginWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
return mozilla::CallWindowProcCrashProtected(PluginWndProcInternal, hWnd, msg, wParam, lParam);
}
/*
* Flash will reset the subclass of our widget at various times.
* (Notably when entering and exiting full screen mode.) This
* occurs independent of the main plugin window event procedure.
* We trap these subclass calls to prevent our subclass hook from
* getting dropped.
* Note, ascii versions can be nixed once flash versions < 10.1
* are considered obsolete.
*/
static WindowsDllInterceptor sUser32Intercept;
#ifdef _WIN64
typedef LONG_PTR
(WINAPI *User32SetWindowLongPtrA)(HWND hWnd,
int nIndex,
LONG_PTR dwNewLong);
typedef LONG_PTR
(WINAPI *User32SetWindowLongPtrW)(HWND hWnd,
int nIndex,
LONG_PTR dwNewLong);
static User32SetWindowLongPtrA sUser32SetWindowLongAHookStub = NULL;
static User32SetWindowLongPtrW sUser32SetWindowLongWHookStub = NULL;
#else
typedef LONG
(WINAPI *User32SetWindowLongA)(HWND hWnd,
int nIndex,
LONG dwNewLong);
typedef LONG
(WINAPI *User32SetWindowLongW)(HWND hWnd,
int nIndex,
LONG dwNewLong);
static User32SetWindowLongA sUser32SetWindowLongAHookStub = NULL;
static User32SetWindowLongW sUser32SetWindowLongWHookStub = NULL;
#endif
static inline bool
SetWindowLongHookCheck(HWND hWnd,
int nIndex,
LONG_PTR newLong)
{
nsPluginNativeWindowWin * win =
(nsPluginNativeWindowWin *)GetProp(hWnd, NS_PLUGIN_WINDOW_PROPERTY_ASSOCIATION);
if (!win || (win && win->mPluginType != nsPluginType_Flash) ||
(nIndex == GWLP_WNDPROC &&
newLong == reinterpret_cast<LONG_PTR>(PluginWndProc)))
return true;
return false;
}
#ifdef _WIN64
LONG_PTR WINAPI
SetWindowLongPtrAHook(HWND hWnd,
int nIndex,
LONG_PTR newLong)
#else
LONG WINAPI
SetWindowLongAHook(HWND hWnd,
int nIndex,
LONG newLong)
#endif
{
if (SetWindowLongHookCheck(hWnd, nIndex, newLong))
return sUser32SetWindowLongAHookStub(hWnd, nIndex, newLong);
// Set flash's new subclass to get the result.
LONG_PTR proc = sUser32SetWindowLongAHookStub(hWnd, nIndex, newLong);
// We already checked this in SetWindowLongHookCheck
nsPluginNativeWindowWin * win =
(nsPluginNativeWindowWin *)GetProp(hWnd, NS_PLUGIN_WINDOW_PROPERTY_ASSOCIATION);
// Hook our subclass back up, just like we do on setwindow.
win->SetPrevWindowProc(
reinterpret_cast<WNDPROC>(sUser32SetWindowLongWHookStub(hWnd, nIndex,
reinterpret_cast<LONG_PTR>(PluginWndProc))));
return proc;
}
#ifdef _WIN64
LONG_PTR WINAPI
SetWindowLongPtrWHook(HWND hWnd,
int nIndex,
LONG_PTR newLong)
#else
LONG WINAPI
SetWindowLongWHook(HWND hWnd,
int nIndex,
LONG newLong)
#endif
{
if (SetWindowLongHookCheck(hWnd, nIndex, newLong))
return sUser32SetWindowLongWHookStub(hWnd, nIndex, newLong);
// Set flash's new subclass to get the result.
LONG_PTR proc = sUser32SetWindowLongWHookStub(hWnd, nIndex, newLong);
// We already checked this in SetWindowLongHookCheck
nsPluginNativeWindowWin * win =
(nsPluginNativeWindowWin *)GetProp(hWnd, NS_PLUGIN_WINDOW_PROPERTY_ASSOCIATION);
// Hook our subclass back up, just like we do on setwindow.
win->SetPrevWindowProc(
reinterpret_cast<WNDPROC>(sUser32SetWindowLongWHookStub(hWnd, nIndex,
reinterpret_cast<LONG_PTR>(PluginWndProc))));
return proc;
}
static void
HookSetWindowLongPtr()
{
sUser32Intercept.Init("user32.dll");
#ifdef _WIN64
if (!sUser32SetWindowLongAHookStub)
sUser32Intercept.AddHook("SetWindowLongPtrA",
reinterpret_cast<intptr_t>(SetWindowLongPtrAHook),
(void**) &sUser32SetWindowLongAHookStub);
if (!sUser32SetWindowLongWHookStub)
sUser32Intercept.AddHook("SetWindowLongPtrW",
reinterpret_cast<intptr_t>(SetWindowLongPtrWHook),
(void**) &sUser32SetWindowLongWHookStub);
#else
if (!sUser32SetWindowLongAHookStub)
sUser32Intercept.AddHook("SetWindowLongA",
reinterpret_cast<intptr_t>(SetWindowLongAHook),
(void**) &sUser32SetWindowLongAHookStub);
if (!sUser32SetWindowLongWHookStub)
sUser32Intercept.AddHook("SetWindowLongW",
reinterpret_cast<intptr_t>(SetWindowLongWHook),
(void**) &sUser32SetWindowLongWHookStub);
#endif
}
/**
* nsPluginNativeWindowWin implementation
*/
nsPluginNativeWindowWin::nsPluginNativeWindowWin() : nsPluginNativeWindow()
{
// initialize the struct fields
window = nullptr;
x = 0;
y = 0;
width = 0;
height = 0;
mPrevWinProc = NULL;
mPluginWinProc = NULL;
mPluginType = nsPluginType_Unknown;
mParentWnd = NULL;
mParentProc = 0;
if (!sWM_FLASHBOUNCEMSG) {
sWM_FLASHBOUNCEMSG = ::RegisterWindowMessage(NS_PLUGIN_CUSTOM_MSG_ID);
}
}
nsPluginNativeWindowWin::~nsPluginNativeWindowWin()
{
// clear weak reference to self to prevent any pending events from
// dereferencing this.
mWeakRef.forget();
}
WNDPROC nsPluginNativeWindowWin::GetPrevWindowProc()
{
return mPrevWinProc;
}
WNDPROC nsPluginNativeWindowWin::GetWindowProc()
{
return mPluginWinProc;
}
NS_IMETHODIMP PluginWindowEvent::Run()
{
nsPluginNativeWindowWin *win = mPluginWindowRef.get();
if (!win)
return NS_OK;
HWND hWnd = GetWnd();
if (!hWnd)
return NS_OK;
nsRefPtr<nsNPAPIPluginInstance> inst;
win->GetPluginInstance(inst);
if (GetMsg() == WM_USER_FLASH) {
// XXX Unwind issues related to runnable event callback depth for this
// event and destruction of the plugin. (Bug 493601)
::PostMessage(hWnd, sWM_FLASHBOUNCEMSG, GetWParam(), GetLParam());
}
else {
// Currently not used, but added so that processing events here
// is more generic.
::CallWindowProc(win->GetWindowProc(),
hWnd,
GetMsg(),
GetWParam(),
GetLParam());
}
Clear();
return NS_OK;
}
PluginWindowEvent *
nsPluginNativeWindowWin::GetPluginWindowEvent(HWND aWnd, UINT aMsg, WPARAM aWParam, LPARAM aLParam)
{
if (!mWeakRef) {
mWeakRef = this;
if (!mWeakRef)
return nullptr;
}
PluginWindowEvent *event;
// We have the ability to alloc if needed in case in the future some plugin
// should post multiple PostMessages. However, this could lead to many
// alloc's per second which could become a performance issue. See bug 169247.
if (!mCachedPluginWindowEvent)
{
event = new PluginWindowEvent();
if (!event) return nullptr;
mCachedPluginWindowEvent = event;
}
else if (mCachedPluginWindowEvent->InUse())
{
event = new PluginWindowEvent();
if (!event) return nullptr;
}
else
{
event = mCachedPluginWindowEvent;
}
event->Init(mWeakRef, aWnd, aMsg, aWParam, aLParam);
return event;
}
nsresult nsPluginNativeWindowWin::CallSetWindow(nsRefPtr<nsNPAPIPluginInstance> &aPluginInstance)
{
// Note, 'window' can be null
// check the incoming instance, null indicates that window is going away and we are
// not interested in subclassing business any more, undo and don't subclass
if (!aPluginInstance) {
UndoSubclassAndAssociateWindow();
nsPluginNativeWindow::CallSetWindow(aPluginInstance);
return NS_OK;
}
// check plugin mime type and cache it if it will need special treatment later
if (mPluginType == nsPluginType_Unknown) {
const char* mimetype = nullptr;
aPluginInstance->GetMIMEType(&mimetype);
if (mimetype) {
if (!strcmp(mimetype, "application/x-shockwave-flash"))
mPluginType = nsPluginType_Flash;
else if (!strcmp(mimetype, "audio/x-pn-realaudio-plugin"))
mPluginType = nsPluginType_Real;
else if (!strcmp(mimetype, "application/pdf"))
mPluginType = nsPluginType_PDF;
else
mPluginType = nsPluginType_Other;
}
}
if (window) {
// grab the widget procedure before the plug-in does a subclass in
// setwindow. We'll use this in PluginWndProc for forwarding focus
// events to the widget.
WNDPROC currentWndProc =
(WNDPROC)::GetWindowLongPtr((HWND)window, GWLP_WNDPROC);
if (!mPrevWinProc && currentWndProc != PluginWndProc)
mPrevWinProc = currentWndProc;
// PDF plugin v7.0.9, v8.1.3, and v9.0 subclass parent window, bug 531551
// V8.2.2 and V9.1 don't have such problem.
if (mPluginType == nsPluginType_PDF) {
HWND parent = ::GetParent((HWND)window);
if (mParentWnd != parent) {
NS_ASSERTION(!mParentWnd, "Plugin's parent window changed");
mParentWnd = parent;
mParentProc = ::GetWindowLongPtr(mParentWnd, GWLP_WNDPROC);
}
}
}
nsPluginNativeWindow::CallSetWindow(aPluginInstance);
SubclassAndAssociateWindow();
if (window && mPluginType == nsPluginType_Flash &&
!GetPropW((HWND)window, L"PluginInstanceParentProperty")) {
HookSetWindowLongPtr();
}
return NS_OK;
}
nsresult nsPluginNativeWindowWin::SubclassAndAssociateWindow()
{
if (type != NPWindowTypeWindow || !window)
return NS_ERROR_FAILURE;
HWND hWnd = (HWND)window;
// check if we need to subclass
WNDPROC currentWndProc = (WNDPROC)::GetWindowLongPtr(hWnd, GWLP_WNDPROC);
if (currentWndProc == PluginWndProc)
return NS_OK;
// If the plugin reset the subclass, set it back.
if (mPluginWinProc) {
#ifdef DEBUG
NS_WARNING("A plugin cleared our subclass - resetting.");
if (currentWndProc != mPluginWinProc) {
NS_WARNING("Procedures do not match up, discarding old subclass value.");
}
if (mPrevWinProc && currentWndProc == mPrevWinProc) {
NS_WARNING("The new procedure is our widget procedure?");
}
#endif
SetWindowLongPtr(hWnd, GWLP_WNDPROC, (LONG_PTR)PluginWndProc);
return NS_OK;
}
LONG_PTR style = GetWindowLongPtr(hWnd, GWL_STYLE);
// Out of process plugins must not have the WS_CLIPCHILDREN style set on their
// parent windows or else synchronous paints (via UpdateWindow() and others)
// will cause deadlocks.
if (::GetPropW(hWnd, L"PluginInstanceParentProperty"))
style &= ~WS_CLIPCHILDREN;
else
style |= WS_CLIPCHILDREN;
SetWindowLongPtr(hWnd, GWL_STYLE, style);
mPluginWinProc = (WNDPROC)SetWindowLongPtr(hWnd, GWLP_WNDPROC, (LONG_PTR)PluginWndProc);
if (!mPluginWinProc)
return NS_ERROR_FAILURE;
DebugOnly<nsPluginNativeWindowWin *> win = (nsPluginNativeWindowWin *)::GetProp(hWnd, NS_PLUGIN_WINDOW_PROPERTY_ASSOCIATION);
NS_ASSERTION(!win || (win == this), "plugin window already has property and this is not us");
if (!::SetProp(hWnd, NS_PLUGIN_WINDOW_PROPERTY_ASSOCIATION, (HANDLE)this))
return NS_ERROR_FAILURE;
return NS_OK;
}
nsresult nsPluginNativeWindowWin::UndoSubclassAndAssociateWindow()
{
// release plugin instance
SetPluginInstance(nullptr);
// remove window property
HWND hWnd = (HWND)window;
if (IsWindow(hWnd))
::RemoveProp(hWnd, NS_PLUGIN_WINDOW_PROPERTY_ASSOCIATION);
// restore the original win proc
// but only do this if this were us last time
if (mPluginWinProc) {
WNDPROC currentWndProc = (WNDPROC)::GetWindowLongPtr(hWnd, GWLP_WNDPROC);
if (currentWndProc == PluginWndProc)
SetWindowLongPtr(hWnd, GWLP_WNDPROC, (LONG_PTR)mPluginWinProc);
mPluginWinProc = NULL;
LONG_PTR style = GetWindowLongPtr(hWnd, GWL_STYLE);
style &= ~WS_CLIPCHILDREN;
SetWindowLongPtr(hWnd, GWL_STYLE, style);
}
if (mPluginType == nsPluginType_PDF && mParentWnd) {
::SetWindowLongPtr(mParentWnd, GWLP_WNDPROC, mParentProc);
mParentWnd = NULL;
mParentProc = 0;
}
return NS_OK;
}
nsresult PLUG_NewPluginNativeWindow(nsPluginNativeWindow ** aPluginNativeWindow)
{
NS_ENSURE_ARG_POINTER(aPluginNativeWindow);
*aPluginNativeWindow = new nsPluginNativeWindowWin();
return *aPluginNativeWindow ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
nsresult PLUG_DeletePluginNativeWindow(nsPluginNativeWindow * aPluginNativeWindow)
{
NS_ENSURE_ARG_POINTER(aPluginNativeWindow);
nsPluginNativeWindowWin *p = (nsPluginNativeWindowWin *)aPluginNativeWindow;
delete p;
return NS_OK;
}
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