diff options
Diffstat (limited to 'widget/windows/WinMouseScrollHandler.cpp')
| -rw-r--r-- | widget/windows/WinMouseScrollHandler.cpp | 1668 |
1 files changed, 1668 insertions, 0 deletions
diff --git a/widget/windows/WinMouseScrollHandler.cpp b/widget/windows/WinMouseScrollHandler.cpp new file mode 100644 index 0000000000..74cb112569 --- /dev/null +++ b/widget/windows/WinMouseScrollHandler.cpp @@ -0,0 +1,1668 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=2 et sw=2 tw=80: */ +/* 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 "mozilla/Logging.h" + +#include "WinMouseScrollHandler.h" +#include "nsWindow.h" +#include "nsWindowDefs.h" +#include "KeyboardLayout.h" +#include "WinUtils.h" +#include "nsGkAtoms.h" +#include "nsIDOMWindowUtils.h" + +#include "mozilla/MiscEvents.h" +#include "mozilla/MouseEvents.h" +#include "mozilla/Preferences.h" +#include "mozilla/dom/WheelEventBinding.h" +#include "mozilla/StaticPrefs_mousewheel.h" + +#include <psapi.h> + +namespace mozilla { +namespace widget { + +LazyLogModule gMouseScrollLog("MouseScrollHandlerWidgets"); + +static const char* GetBoolName(bool aBool) { return aBool ? "TRUE" : "FALSE"; } + +MouseScrollHandler* MouseScrollHandler::sInstance = nullptr; + +bool MouseScrollHandler::Device::sFakeScrollableWindowNeeded = false; + +bool MouseScrollHandler::Device::SynTP::sInitialized = false; +int32_t MouseScrollHandler::Device::SynTP::sMajorVersion = 0; +int32_t MouseScrollHandler::Device::SynTP::sMinorVersion = -1; + +bool MouseScrollHandler::Device::Elantech::sUseSwipeHack = false; +bool MouseScrollHandler::Device::Elantech::sUsePinchHack = false; +DWORD MouseScrollHandler::Device::Elantech::sZoomUntil = 0; + +bool MouseScrollHandler::Device::Apoint::sInitialized = false; +int32_t MouseScrollHandler::Device::Apoint::sMajorVersion = 0; +int32_t MouseScrollHandler::Device::Apoint::sMinorVersion = -1; + +bool MouseScrollHandler::Device::SetPoint::sMightBeUsing = false; + +// The duration until timeout of events transaction. The value is 1.5 sec, +// it's just a magic number, it was suggested by Logitech's engineer, see +// bug 605648 comment 90. +#define DEFAULT_TIMEOUT_DURATION 1500 + +/****************************************************************************** + * + * MouseScrollHandler + * + ******************************************************************************/ + +/* static */ +POINTS +MouseScrollHandler::GetCurrentMessagePos() { + if (SynthesizingEvent::IsSynthesizing()) { + return sInstance->mSynthesizingEvent->GetCursorPoint(); + } + DWORD pos = ::GetMessagePos(); + return MAKEPOINTS(pos); +} + +// Get rid of the GetMessagePos() API. +#define GetMessagePos() + +/* static */ +void MouseScrollHandler::Initialize() { Device::Init(); } + +/* static */ +void MouseScrollHandler::Shutdown() { + delete sInstance; + sInstance = nullptr; +} + +/* static */ +MouseScrollHandler* MouseScrollHandler::GetInstance() { + if (!sInstance) { + sInstance = new MouseScrollHandler(); + } + return sInstance; +} + +MouseScrollHandler::MouseScrollHandler() + : mIsWaitingInternalMessage(false), mSynthesizingEvent(nullptr) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll: Creating an instance, this=%p, sInstance=%p", this, + sInstance)); +} + +MouseScrollHandler::~MouseScrollHandler() { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll: Destroying an instance, this=%p, sInstance=%p", this, + sInstance)); + + delete mSynthesizingEvent; +} + +/* static */ +void MouseScrollHandler::MaybeLogKeyState() { + if (!MOZ_LOG_TEST(gMouseScrollLog, LogLevel::Debug)) { + return; + } + BYTE keyboardState[256]; + if (::GetKeyboardState(keyboardState)) { + for (size_t i = 0; i < ArrayLength(keyboardState); i++) { + if (keyboardState[i]) { + MOZ_LOG(gMouseScrollLog, LogLevel::Debug, + (" Current key state: keyboardState[0x%02zX]=0x%02X (%s)", i, + keyboardState[i], + ((keyboardState[i] & 0x81) == 0x81) ? "Pressed and Toggled" + : (keyboardState[i] & 0x80) ? "Pressed" + : (keyboardState[i] & 0x01) ? "Toggled" + : "Unknown")); + } + } + } else { + MOZ_LOG( + gMouseScrollLog, LogLevel::Debug, + ("MouseScroll::MaybeLogKeyState(): Failed to print current keyboard " + "state")); + } +} + +/* static */ +bool MouseScrollHandler::NeedsMessage(UINT aMsg) { + switch (aMsg) { + case WM_SETTINGCHANGE: + case WM_MOUSEWHEEL: + case WM_MOUSEHWHEEL: + case WM_HSCROLL: + case WM_VSCROLL: + case MOZ_WM_MOUSEVWHEEL: + case MOZ_WM_MOUSEHWHEEL: + case MOZ_WM_HSCROLL: + case MOZ_WM_VSCROLL: + case WM_KEYDOWN: + case WM_KEYUP: + return true; + } + return false; +} + +/* static */ +bool MouseScrollHandler::ProcessMessage(nsWindow* aWidget, UINT msg, + WPARAM wParam, LPARAM lParam, + MSGResult& aResult) { + Device::Elantech::UpdateZoomUntil(); + + switch (msg) { + case WM_SETTINGCHANGE: + if (!sInstance) { + return false; + } + if (wParam == SPI_SETWHEELSCROLLLINES || + wParam == SPI_SETWHEELSCROLLCHARS) { + sInstance->mSystemSettings.MarkDirty(); + } + return false; + + case WM_MOUSEWHEEL: + case WM_MOUSEHWHEEL: + GetInstance()->ProcessNativeMouseWheelMessage(aWidget, msg, wParam, + lParam); + sInstance->mSynthesizingEvent->NotifyNativeMessageHandlingFinished(); + // We don't need to call next wndproc for WM_MOUSEWHEEL and + // WM_MOUSEHWHEEL. We should consume them always. If the messages + // would be handled by our window again, it caused making infinite + // message loop. + aResult.mConsumed = true; + aResult.mResult = (msg != WM_MOUSEHWHEEL); + return true; + + case WM_HSCROLL: + case WM_VSCROLL: + aResult.mConsumed = GetInstance()->ProcessNativeScrollMessage( + aWidget, msg, wParam, lParam); + sInstance->mSynthesizingEvent->NotifyNativeMessageHandlingFinished(); + aResult.mResult = 0; + return true; + + case MOZ_WM_MOUSEVWHEEL: + case MOZ_WM_MOUSEHWHEEL: + GetInstance()->HandleMouseWheelMessage(aWidget, msg, wParam, lParam); + sInstance->mSynthesizingEvent->NotifyInternalMessageHandlingFinished(); + // Doesn't need to call next wndproc for internal wheel message. + aResult.mConsumed = true; + return true; + + case MOZ_WM_HSCROLL: + case MOZ_WM_VSCROLL: + GetInstance()->HandleScrollMessageAsMouseWheelMessage(aWidget, msg, + wParam, lParam); + sInstance->mSynthesizingEvent->NotifyInternalMessageHandlingFinished(); + // Doesn't need to call next wndproc for internal scroll message. + aResult.mConsumed = true; + return true; + + case WM_KEYDOWN: + case WM_KEYUP: + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessMessage(): aWidget=%p, " + "msg=%s(0x%04X), wParam=0x%02zX, ::GetMessageTime()=%ld", + aWidget, + msg == WM_KEYDOWN ? "WM_KEYDOWN" + : msg == WM_KEYUP ? "WM_KEYUP" + : "Unknown", + msg, wParam, ::GetMessageTime())); + MaybeLogKeyState(); + if (Device::Elantech::HandleKeyMessage(aWidget, msg, wParam, lParam)) { + aResult.mResult = 0; + aResult.mConsumed = true; + return true; + } + return false; + + default: + return false; + } +} + +/* static */ +nsresult MouseScrollHandler::SynthesizeNativeMouseScrollEvent( + nsWindow* aWidget, const LayoutDeviceIntPoint& aPoint, + uint32_t aNativeMessage, int32_t aDelta, uint32_t aModifierFlags, + uint32_t aAdditionalFlags) { + bool useFocusedWindow = !( + aAdditionalFlags & nsIDOMWindowUtils::MOUSESCROLL_PREFER_WIDGET_AT_POINT); + + POINT pt; + pt.x = aPoint.x; + pt.y = aPoint.y; + + HWND target = useFocusedWindow ? ::WindowFromPoint(pt) : ::GetFocus(); + NS_ENSURE_TRUE(target, NS_ERROR_FAILURE); + + WPARAM wParam = 0; + LPARAM lParam = 0; + switch (aNativeMessage) { + case WM_MOUSEWHEEL: + case WM_MOUSEHWHEEL: { + lParam = MAKELPARAM(pt.x, pt.y); + WORD mod = 0; + if (aModifierFlags & (nsIWidget::CTRL_L | nsIWidget::CTRL_R)) { + mod |= MK_CONTROL; + } + if (aModifierFlags & (nsIWidget::SHIFT_L | nsIWidget::SHIFT_R)) { + mod |= MK_SHIFT; + } + wParam = MAKEWPARAM(mod, aDelta); + break; + } + case WM_VSCROLL: + case WM_HSCROLL: + lParam = (aAdditionalFlags & + nsIDOMWindowUtils::MOUSESCROLL_WIN_SCROLL_LPARAM_NOT_NULL) + ? reinterpret_cast<LPARAM>(target) + : 0; + wParam = aDelta; + break; + default: + return NS_ERROR_INVALID_ARG; + } + + // Ensure to make the instance. + GetInstance(); + + BYTE kbdState[256]; + memset(kbdState, 0, sizeof(kbdState)); + + AutoTArray<KeyPair, 10> keySequence; + WinUtils::SetupKeyModifiersSequence(&keySequence, aModifierFlags, + aNativeMessage); + + for (uint32_t i = 0; i < keySequence.Length(); ++i) { + uint8_t key = keySequence[i].mGeneral; + uint8_t keySpecific = keySequence[i].mSpecific; + kbdState[key] = 0x81; // key is down and toggled on if appropriate + if (keySpecific) { + kbdState[keySpecific] = 0x81; + } + } + + if (!sInstance->mSynthesizingEvent) { + sInstance->mSynthesizingEvent = new SynthesizingEvent(); + } + + POINTS pts; + pts.x = static_cast<SHORT>(pt.x); + pts.y = static_cast<SHORT>(pt.y); + return sInstance->mSynthesizingEvent->Synthesize(pts, target, aNativeMessage, + wParam, lParam, kbdState); +} + +/* static */ +void MouseScrollHandler::InitEvent(nsWindow* aWidget, WidgetGUIEvent& aEvent, + LPARAM* aPoint) { + NS_ENSURE_TRUE_VOID(aWidget); + + // If a point is provided, use it; otherwise, get current message point or + // synthetic point + POINTS pointOnScreen; + if (aPoint != nullptr) { + pointOnScreen = MAKEPOINTS(*aPoint); + } else { + pointOnScreen = GetCurrentMessagePos(); + } + + // InitEvent expects the point to be in window coordinates, so translate the + // point from screen coordinates. + POINT pointOnWindow; + POINTSTOPOINT(pointOnWindow, pointOnScreen); + ::ScreenToClient(aWidget->GetWindowHandle(), &pointOnWindow); + + LayoutDeviceIntPoint point; + point.x = pointOnWindow.x; + point.y = pointOnWindow.y; + + aWidget->InitEvent(aEvent, &point); +} + +/* static */ +ModifierKeyState MouseScrollHandler::GetModifierKeyState(UINT aMessage) { + ModifierKeyState result; + // Assume the Control key is down if the Elantech touchpad has sent the + // mis-ordered WM_KEYDOWN/WM_MOUSEWHEEL messages. (See the comment in + // MouseScrollHandler::Device::Elantech::HandleKeyMessage().) + if ((aMessage == MOZ_WM_MOUSEVWHEEL || aMessage == WM_MOUSEWHEEL) && + !result.IsControl() && Device::Elantech::IsZooming()) { + // XXX Do we need to unset MODIFIER_SHIFT, MODIFIER_ALT, MODIFIER_OS too? + // If one of them are true, the default action becomes not zooming. + result.Unset(MODIFIER_ALTGRAPH); + result.Set(MODIFIER_CONTROL); + } + return result; +} + +POINT +MouseScrollHandler::ComputeMessagePos(UINT aMessage, WPARAM aWParam, + LPARAM aLParam) { + POINT point; + if (Device::SetPoint::IsGetMessagePosResponseValid(aMessage, aWParam, + aLParam)) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ComputeMessagePos: Using ::GetCursorPos()")); + ::GetCursorPos(&point); + } else { + POINTS pts = GetCurrentMessagePos(); + point.x = pts.x; + point.y = pts.y; + } + return point; +} + +void MouseScrollHandler::ProcessNativeMouseWheelMessage(nsWindow* aWidget, + UINT aMessage, + WPARAM aWParam, + LPARAM aLParam) { + if (SynthesizingEvent::IsSynthesizing()) { + mSynthesizingEvent->NativeMessageReceived(aWidget, aMessage, aWParam, + aLParam); + } + + POINT point = ComputeMessagePos(aMessage, aWParam, aLParam); + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessNativeMouseWheelMessage: aWidget=%p, " + "aMessage=%s, wParam=0x%08zX, lParam=0x%08" PRIXLPTR + ", point: { x=%ld, y=%ld }", + aWidget, + aMessage == WM_MOUSEWHEEL ? "WM_MOUSEWHEEL" + : aMessage == WM_MOUSEHWHEEL ? "WM_MOUSEHWHEEL" + : aMessage == WM_VSCROLL ? "WM_VSCROLL" + : "WM_HSCROLL", + aWParam, aLParam, point.x, point.y)); + MaybeLogKeyState(); + + HWND underCursorWnd = ::WindowFromPoint(point); + if (!underCursorWnd) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessNativeMouseWheelMessage: " + "No window is not found under the cursor")); + return; + } + + if (Device::Elantech::IsPinchHackNeeded() && + Device::Elantech::IsHelperWindow(underCursorWnd)) { + // The Elantech driver places a window right underneath the cursor + // when sending a WM_MOUSEWHEEL event to us as part of a pinch-to-zoom + // gesture. We detect that here, and search for our window that would + // be beneath the cursor if that window wasn't there. + underCursorWnd = WinUtils::FindOurWindowAtPoint(point); + if (!underCursorWnd) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessNativeMouseWheelMessage: " + "Our window is not found under the Elantech helper window")); + return; + } + } + + // Handle most cases first. If the window under mouse cursor is our window + // except plugin window (MozillaWindowClass), we should handle the message + // on the window. + if (WinUtils::IsOurProcessWindow(underCursorWnd)) { + nsWindow* destWindow = WinUtils::GetNSWindowPtr(underCursorWnd); + if (!destWindow) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessNativeMouseWheelMessage: " + "Found window under the cursor isn't managed by nsWindow...")); + HWND wnd = ::GetParent(underCursorWnd); + for (; wnd; wnd = ::GetParent(wnd)) { + destWindow = WinUtils::GetNSWindowPtr(wnd); + if (destWindow) { + break; + } + } + if (!wnd) { + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessNativeMouseWheelMessage: Our window which is " + "managed by nsWindow is not found under the cursor")); + return; + } + } + + MOZ_ASSERT(destWindow, "destWindow must not be NULL"); + + // Some odd touchpad utils sets focus to window under the mouse cursor. + // this emulates the odd behavior for debug. + if (mUserPrefs.ShouldEmulateToMakeWindowUnderCursorForeground() && + (aMessage == WM_MOUSEWHEEL || aMessage == WM_MOUSEHWHEEL) && + ::GetForegroundWindow() != destWindow->GetWindowHandle()) { + ::SetForegroundWindow(destWindow->GetWindowHandle()); + } + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessNativeMouseWheelMessage: Succeeded, " + "Posting internal message to an nsWindow (%p)...", + destWindow)); + mIsWaitingInternalMessage = true; + UINT internalMessage = WinUtils::GetInternalMessage(aMessage); + ::PostMessage(destWindow->GetWindowHandle(), internalMessage, aWParam, + aLParam); + return; + } + + // If the window under cursor is not in our process, it means: + // 1. The window may be a plugin window (GeckoPluginWindow or its descendant). + // 2. The window may be another application's window. + HWND pluginWnd = WinUtils::FindOurProcessWindow(underCursorWnd); + if (!pluginWnd) { + // If there is no plugin window in ancestors of the window under cursor, + // the window is for another applications (case 2). + // We don't need to handle this message. + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessNativeMouseWheelMessage: " + "Our window is not found under the cursor")); + return; + } + + // If the window is a part of plugin, we should post the message to it. + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessNativeMouseWheelMessage: Succeeded, " + "Redirecting the message to a window which is a plugin child window")); + ::PostMessage(underCursorWnd, aMessage, aWParam, aLParam); +} + +bool MouseScrollHandler::ProcessNativeScrollMessage(nsWindow* aWidget, + UINT aMessage, + WPARAM aWParam, + LPARAM aLParam) { + if (aLParam || mUserPrefs.IsScrollMessageHandledAsWheelMessage()) { + // Scroll message generated by Thinkpad Trackpoint Driver or similar + // Treat as a mousewheel message and scroll appropriately + ProcessNativeMouseWheelMessage(aWidget, aMessage, aWParam, aLParam); + // Always consume the scroll message if we try to emulate mouse wheel + // action. + return true; + } + + if (SynthesizingEvent::IsSynthesizing()) { + mSynthesizingEvent->NativeMessageReceived(aWidget, aMessage, aWParam, + aLParam); + } + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::ProcessNativeScrollMessage: aWidget=%p, " + "aMessage=%s, wParam=0x%08zX, lParam=0x%08" PRIXLPTR, + aWidget, aMessage == WM_VSCROLL ? "WM_VSCROLL" : "WM_HSCROLL", + aWParam, aLParam)); + + // Scroll message generated by external application + WidgetContentCommandEvent commandEvent(true, eContentCommandScroll, aWidget); + commandEvent.mScroll.mIsHorizontal = (aMessage == WM_HSCROLL); + + switch (LOWORD(aWParam)) { + case SB_LINEUP: // SB_LINELEFT + commandEvent.mScroll.mUnit = + WidgetContentCommandEvent::eCmdScrollUnit_Line; + commandEvent.mScroll.mAmount = -1; + break; + case SB_LINEDOWN: // SB_LINERIGHT + commandEvent.mScroll.mUnit = + WidgetContentCommandEvent::eCmdScrollUnit_Line; + commandEvent.mScroll.mAmount = 1; + break; + case SB_PAGEUP: // SB_PAGELEFT + commandEvent.mScroll.mUnit = + WidgetContentCommandEvent::eCmdScrollUnit_Page; + commandEvent.mScroll.mAmount = -1; + break; + case SB_PAGEDOWN: // SB_PAGERIGHT + commandEvent.mScroll.mUnit = + WidgetContentCommandEvent::eCmdScrollUnit_Page; + commandEvent.mScroll.mAmount = 1; + break; + case SB_TOP: // SB_LEFT + commandEvent.mScroll.mUnit = + WidgetContentCommandEvent::eCmdScrollUnit_Whole; + commandEvent.mScroll.mAmount = -1; + break; + case SB_BOTTOM: // SB_RIGHT + commandEvent.mScroll.mUnit = + WidgetContentCommandEvent::eCmdScrollUnit_Whole; + commandEvent.mScroll.mAmount = 1; + break; + default: + return false; + } + // XXX If this is a plugin window, we should dispatch the event from + // parent window. + aWidget->DispatchContentCommandEvent(&commandEvent); + return true; +} + +void MouseScrollHandler::HandleMouseWheelMessage(nsWindow* aWidget, + UINT aMessage, WPARAM aWParam, + LPARAM aLParam) { + MOZ_ASSERT((aMessage == MOZ_WM_MOUSEVWHEEL || aMessage == MOZ_WM_MOUSEHWHEEL), + "HandleMouseWheelMessage must be called with " + "MOZ_WM_MOUSEVWHEEL or MOZ_WM_MOUSEHWHEEL"); + + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScroll::HandleMouseWheelMessage: aWidget=%p, " + "aMessage=MOZ_WM_MOUSE%sWHEEL, aWParam=0x%08zX, aLParam=0x%08" PRIXLPTR, + aWidget, aMessage == MOZ_WM_MOUSEVWHEEL ? "V" : "H", aWParam, aLParam)); + + mIsWaitingInternalMessage = false; + + // If it's not allowed to cache system settings, we need to reset the cache + // before handling the mouse wheel message. + mSystemSettings.TrustedScrollSettingsDriver(); + + EventInfo eventInfo(aWidget, WinUtils::GetNativeMessage(aMessage), aWParam, + aLParam); + if (!eventInfo.CanDispatchWheelEvent()) { + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScroll::HandleMouseWheelMessage: Cannot dispatch the events")); + mLastEventInfo.ResetTransaction(); + return; + } + + // Discard the remaining delta if current wheel message and last one are + // received by different window or to scroll different direction or + // different unit scroll. Furthermore, if the last event was too old. + if (!mLastEventInfo.CanContinueTransaction(eventInfo)) { + mLastEventInfo.ResetTransaction(); + } + + mLastEventInfo.RecordEvent(eventInfo); + + ModifierKeyState modKeyState = GetModifierKeyState(aMessage); + + // Grab the widget, it might be destroyed by a DOM event handler. + RefPtr<nsWindow> kungFuDethGrip(aWidget); + + WidgetWheelEvent wheelEvent(true, eWheel, aWidget); + if (mLastEventInfo.InitWheelEvent(aWidget, wheelEvent, modKeyState, + aLParam)) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::HandleMouseWheelMessage: dispatching " + "eWheel event")); + aWidget->DispatchWheelEvent(&wheelEvent); + if (aWidget->Destroyed()) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::HandleMouseWheelMessage: The window was destroyed " + "by eWheel event")); + mLastEventInfo.ResetTransaction(); + return; + } + } else { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::HandleMouseWheelMessage: eWheel event is not " + "dispatched")); + } +} + +void MouseScrollHandler::HandleScrollMessageAsMouseWheelMessage( + nsWindow* aWidget, UINT aMessage, WPARAM aWParam, LPARAM aLParam) { + MOZ_ASSERT((aMessage == MOZ_WM_VSCROLL || aMessage == MOZ_WM_HSCROLL), + "HandleScrollMessageAsMouseWheelMessage must be called with " + "MOZ_WM_VSCROLL or MOZ_WM_HSCROLL"); + + mIsWaitingInternalMessage = false; + + ModifierKeyState modKeyState = GetModifierKeyState(aMessage); + + WidgetWheelEvent wheelEvent(true, eWheel, aWidget); + double& delta = + (aMessage == MOZ_WM_VSCROLL) ? wheelEvent.mDeltaY : wheelEvent.mDeltaX; + int32_t& lineOrPageDelta = (aMessage == MOZ_WM_VSCROLL) + ? wheelEvent.mLineOrPageDeltaY + : wheelEvent.mLineOrPageDeltaX; + + delta = 1.0; + lineOrPageDelta = 1; + + switch (LOWORD(aWParam)) { + case SB_PAGEUP: + delta = -1.0; + lineOrPageDelta = -1; + [[fallthrough]]; + case SB_PAGEDOWN: + wheelEvent.mDeltaMode = dom::WheelEvent_Binding::DOM_DELTA_PAGE; + break; + + case SB_LINEUP: + delta = -1.0; + lineOrPageDelta = -1; + [[fallthrough]]; + case SB_LINEDOWN: + wheelEvent.mDeltaMode = dom::WheelEvent_Binding::DOM_DELTA_LINE; + break; + + default: + return; + } + modKeyState.InitInputEvent(wheelEvent); + + // Current mouse position may not be same as when the original message + // is received. However, this data is not available with the original + // message, which is why nullptr is passed in. We need to know the actual + // mouse cursor position when the original message was received. + InitEvent(aWidget, wheelEvent, nullptr); + + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScroll::HandleScrollMessageAsMouseWheelMessage: aWidget=%p, " + "aMessage=MOZ_WM_%sSCROLL, aWParam=0x%08zX, aLParam=0x%08" PRIXLPTR ", " + "wheelEvent { mRefPoint: { x: %d, y: %d }, mDeltaX: %f, mDeltaY: %f, " + "mLineOrPageDeltaX: %d, mLineOrPageDeltaY: %d, " + "isShift: %s, isControl: %s, isAlt: %s, isMeta: %s }", + aWidget, (aMessage == MOZ_WM_VSCROLL) ? "V" : "H", aWParam, aLParam, + wheelEvent.mRefPoint.x.value, wheelEvent.mRefPoint.y.value, + wheelEvent.mDeltaX, wheelEvent.mDeltaY, wheelEvent.mLineOrPageDeltaX, + wheelEvent.mLineOrPageDeltaY, GetBoolName(wheelEvent.IsShift()), + GetBoolName(wheelEvent.IsControl()), GetBoolName(wheelEvent.IsAlt()), + GetBoolName(wheelEvent.IsMeta()))); + + aWidget->DispatchWheelEvent(&wheelEvent); +} + +/****************************************************************************** + * + * EventInfo + * + ******************************************************************************/ + +MouseScrollHandler::EventInfo::EventInfo(nsWindow* aWidget, UINT aMessage, + WPARAM aWParam, LPARAM aLParam) { + MOZ_ASSERT( + aMessage == WM_MOUSEWHEEL || aMessage == WM_MOUSEHWHEEL, + "EventInfo must be initialized with WM_MOUSEWHEEL or WM_MOUSEHWHEEL"); + + MouseScrollHandler::GetInstance()->mSystemSettings.Init(); + + mIsVertical = (aMessage == WM_MOUSEWHEEL); + mIsPage = + MouseScrollHandler::sInstance->mSystemSettings.IsPageScroll(mIsVertical); + mDelta = (short)HIWORD(aWParam); + mWnd = aWidget->GetWindowHandle(); + mTimeStamp = TimeStamp::Now(); +} + +bool MouseScrollHandler::EventInfo::CanDispatchWheelEvent() const { + if (!GetScrollAmount()) { + // XXX I think that we should dispatch mouse wheel events even if the + // operation will not scroll because the wheel operation really happened + // and web application may want to handle the event for non-scroll action. + return false; + } + + return (mDelta != 0); +} + +int32_t MouseScrollHandler::EventInfo::GetScrollAmount() const { + if (mIsPage) { + return 1; + } + return MouseScrollHandler::sInstance->mSystemSettings.GetScrollAmount( + mIsVertical); +} + +/****************************************************************************** + * + * LastEventInfo + * + ******************************************************************************/ + +bool MouseScrollHandler::LastEventInfo::CanContinueTransaction( + const EventInfo& aNewEvent) { + int32_t timeout = MouseScrollHandler::sInstance->mUserPrefs + .GetMouseScrollTransactionTimeout(); + return !mWnd || + (mWnd == aNewEvent.GetWindowHandle() && + IsPositive() == aNewEvent.IsPositive() && + mIsVertical == aNewEvent.IsVertical() && + mIsPage == aNewEvent.IsPage() && + (timeout < 0 || TimeStamp::Now() - mTimeStamp <= + TimeDuration::FromMilliseconds(timeout))); +} + +void MouseScrollHandler::LastEventInfo::ResetTransaction() { + if (!mWnd) { + return; + } + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::LastEventInfo::ResetTransaction()")); + + mWnd = nullptr; + mAccumulatedDelta = 0; +} + +void MouseScrollHandler::LastEventInfo::RecordEvent(const EventInfo& aEvent) { + mWnd = aEvent.GetWindowHandle(); + mDelta = aEvent.GetNativeDelta(); + mIsVertical = aEvent.IsVertical(); + mIsPage = aEvent.IsPage(); + mTimeStamp = TimeStamp::Now(); +} + +/* static */ +int32_t MouseScrollHandler::LastEventInfo::RoundDelta(double aDelta) { + return (aDelta >= 0) ? (int32_t)floor(aDelta) : (int32_t)ceil(aDelta); +} + +bool MouseScrollHandler::LastEventInfo::InitWheelEvent( + nsWindow* aWidget, WidgetWheelEvent& aWheelEvent, + const ModifierKeyState& aModKeyState, LPARAM aLParam) { + MOZ_ASSERT(aWheelEvent.mMessage == eWheel); + + if (StaticPrefs::mousewheel_ignore_cursor_position_in_lparam()) { + InitEvent(aWidget, aWheelEvent, nullptr); + } else { + InitEvent(aWidget, aWheelEvent, &aLParam); + } + + aModKeyState.InitInputEvent(aWheelEvent); + + // Our positive delta value means to bottom or right. + // But positive native delta value means to top or right. + // Use orienter for computing our delta value with native delta value. + int32_t orienter = mIsVertical ? -1 : 1; + + aWheelEvent.mDeltaMode = mIsPage ? dom::WheelEvent_Binding::DOM_DELTA_PAGE + : dom::WheelEvent_Binding::DOM_DELTA_LINE; + + double ticks = double(mDelta) * orienter / double(WHEEL_DELTA); + if (mIsVertical) { + aWheelEvent.mWheelTicksY = ticks; + } else { + aWheelEvent.mWheelTicksX = ticks; + } + + double& delta = mIsVertical ? aWheelEvent.mDeltaY : aWheelEvent.mDeltaX; + int32_t& lineOrPageDelta = mIsVertical ? aWheelEvent.mLineOrPageDeltaY + : aWheelEvent.mLineOrPageDeltaX; + + double nativeDeltaPerUnit = + mIsPage ? double(WHEEL_DELTA) : double(WHEEL_DELTA) / GetScrollAmount(); + + delta = double(mDelta) * orienter / nativeDeltaPerUnit; + mAccumulatedDelta += mDelta; + lineOrPageDelta = + mAccumulatedDelta * orienter / RoundDelta(nativeDeltaPerUnit); + mAccumulatedDelta -= + lineOrPageDelta * orienter * RoundDelta(nativeDeltaPerUnit); + + if (aWheelEvent.mDeltaMode != dom::WheelEvent_Binding::DOM_DELTA_LINE) { + // If the scroll delta mode isn't per line scroll, we shouldn't allow to + // override the system scroll speed setting. + aWheelEvent.mAllowToOverrideSystemScrollSpeed = false; + } else if (!MouseScrollHandler::sInstance->mSystemSettings + .IsOverridingSystemScrollSpeedAllowed()) { + // If the system settings are customized by either the user or + // the mouse utility, we shouldn't allow to override the system scroll + // speed setting. + aWheelEvent.mAllowToOverrideSystemScrollSpeed = false; + } else { + // For suppressing too fast scroll, we should ensure that the maximum + // overridden delta value should be less than overridden scroll speed + // with default scroll amount. + double defaultScrollAmount = mIsVertical + ? SystemSettings::DefaultScrollLines() + : SystemSettings::DefaultScrollChars(); + double maxDelta = WidgetWheelEvent::ComputeOverriddenDelta( + defaultScrollAmount, mIsVertical); + if (maxDelta != defaultScrollAmount) { + double overriddenDelta = + WidgetWheelEvent::ComputeOverriddenDelta(Abs(delta), mIsVertical); + if (overriddenDelta > maxDelta) { + // Suppress to fast scroll since overriding system scroll speed with + // current delta value causes too big delta value. + aWheelEvent.mAllowToOverrideSystemScrollSpeed = false; + } + } + } + + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScroll::LastEventInfo::InitWheelEvent: aWidget=%p, " + "aWheelEvent { mRefPoint: { x: %d, y: %d }, mDeltaX: %f, mDeltaY: %f, " + "mLineOrPageDeltaX: %d, mLineOrPageDeltaY: %d, " + "isShift: %s, isControl: %s, isAlt: %s, isMeta: %s, " + "mAllowToOverrideSystemScrollSpeed: %s }, " + "mAccumulatedDelta: %d", + aWidget, aWheelEvent.mRefPoint.x.value, aWheelEvent.mRefPoint.y.value, + aWheelEvent.mDeltaX, aWheelEvent.mDeltaY, aWheelEvent.mLineOrPageDeltaX, + aWheelEvent.mLineOrPageDeltaY, GetBoolName(aWheelEvent.IsShift()), + GetBoolName(aWheelEvent.IsControl()), GetBoolName(aWheelEvent.IsAlt()), + GetBoolName(aWheelEvent.IsMeta()), + GetBoolName(aWheelEvent.mAllowToOverrideSystemScrollSpeed), + mAccumulatedDelta)); + + return (delta != 0); +} + +/****************************************************************************** + * + * SystemSettings + * + ******************************************************************************/ + +void MouseScrollHandler::SystemSettings::Init() { + if (mInitialized) { + return; + } + + InitScrollLines(); + InitScrollChars(); + + mInitialized = true; + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::SystemSettings::Init(): initialized, " + "mScrollLines=%d, mScrollChars=%d", + mScrollLines, mScrollChars)); +} + +bool MouseScrollHandler::SystemSettings::InitScrollLines() { + int32_t oldValue = mInitialized ? mScrollLines : 0; + mIsReliableScrollLines = false; + mScrollLines = MouseScrollHandler::sInstance->mUserPrefs + .GetOverriddenVerticalScrollAmout(); + if (mScrollLines >= 0) { + // overridden by the pref. + mIsReliableScrollLines = true; + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::SystemSettings::InitScrollLines(): mScrollLines is " + "overridden by the pref: %d", + mScrollLines)); + } else if (!::SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &mScrollLines, + 0)) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::SystemSettings::InitScrollLines(): " + "::SystemParametersInfo(" + "SPI_GETWHEELSCROLLLINES) failed")); + mScrollLines = DefaultScrollLines(); + } + + if (mScrollLines > WHEEL_DELTA) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::SystemSettings::InitScrollLines(): the result of " + "::SystemParametersInfo(SPI_GETWHEELSCROLLLINES) is too large: %d", + mScrollLines)); + // sScrollLines usually equals 3 or 0 (for no scrolling) + // However, if sScrollLines > WHEEL_DELTA, we assume that + // the mouse driver wants a page scroll. The docs state that + // sScrollLines should explicitly equal WHEEL_PAGESCROLL, but + // since some mouse drivers use an arbitrary large number instead, + // we have to handle that as well. + mScrollLines = WHEEL_PAGESCROLL; + } + + return oldValue != mScrollLines; +} + +bool MouseScrollHandler::SystemSettings::InitScrollChars() { + int32_t oldValue = mInitialized ? mScrollChars : 0; + mIsReliableScrollChars = false; + mScrollChars = MouseScrollHandler::sInstance->mUserPrefs + .GetOverriddenHorizontalScrollAmout(); + if (mScrollChars >= 0) { + // overridden by the pref. + mIsReliableScrollChars = true; + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::SystemSettings::InitScrollChars(): mScrollChars is " + "overridden by the pref: %d", + mScrollChars)); + } else if (!::SystemParametersInfo(SPI_GETWHEELSCROLLCHARS, 0, &mScrollChars, + 0)) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::SystemSettings::InitScrollChars(): " + "::SystemParametersInfo(" + "SPI_GETWHEELSCROLLCHARS) failed, this is unexpected on Vista or " + "later")); + // XXX Should we use DefaultScrollChars()? + mScrollChars = 1; + } + + if (mScrollChars > WHEEL_DELTA) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::SystemSettings::InitScrollChars(): the result of " + "::SystemParametersInfo(SPI_GETWHEELSCROLLCHARS) is too large: %d", + mScrollChars)); + // See the comments for the case mScrollLines > WHEEL_DELTA. + mScrollChars = WHEEL_PAGESCROLL; + } + + return oldValue != mScrollChars; +} + +void MouseScrollHandler::SystemSettings::MarkDirty() { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScrollHandler::SystemSettings::MarkDirty(): " + "Marking SystemSettings dirty")); + mInitialized = false; + // When system settings are changed, we should reset current transaction. + MOZ_ASSERT(sInstance, + "Must not be called at initializing MouseScrollHandler"); + MouseScrollHandler::sInstance->mLastEventInfo.ResetTransaction(); +} + +void MouseScrollHandler::SystemSettings::RefreshCache() { + bool isChanged = InitScrollLines(); + isChanged = InitScrollChars() || isChanged; + if (!isChanged) { + return; + } + // If the scroll amount is changed, we should reset current transaction. + MOZ_ASSERT(sInstance, + "Must not be called at initializing MouseScrollHandler"); + MouseScrollHandler::sInstance->mLastEventInfo.ResetTransaction(); +} + +void MouseScrollHandler::SystemSettings::TrustedScrollSettingsDriver() { + if (!mInitialized) { + return; + } + + // if the cache is initialized with prefs, we don't need to refresh it. + if (mIsReliableScrollLines && mIsReliableScrollChars) { + return; + } + + MouseScrollHandler::UserPrefs& userPrefs = + MouseScrollHandler::sInstance->mUserPrefs; + + // If system settings cache is disabled, we should always refresh them. + if (!userPrefs.IsSystemSettingCacheEnabled()) { + RefreshCache(); + return; + } + + // If pref is set to as "always trust the cache", we shouldn't refresh them + // in any environments. + if (userPrefs.IsSystemSettingCacheForciblyEnabled()) { + return; + } + + // If SynTP of Synaptics or Apoint of Alps is installed, it may hook + // ::SystemParametersInfo() and returns different value from system settings. + if (Device::SynTP::IsDriverInstalled() || + Device::Apoint::IsDriverInstalled()) { + RefreshCache(); + return; + } + + // XXX We're not sure about other touchpad drivers... +} + +bool MouseScrollHandler::SystemSettings:: + IsOverridingSystemScrollSpeedAllowed() { + return mScrollLines == DefaultScrollLines() && + mScrollChars == DefaultScrollChars(); +} + +/****************************************************************************** + * + * UserPrefs + * + ******************************************************************************/ + +MouseScrollHandler::UserPrefs::UserPrefs() : mInitialized(false) { + // We need to reset mouse wheel transaction when all of mousewheel related + // prefs are changed. + DebugOnly<nsresult> rv = + Preferences::RegisterPrefixCallback(OnChange, "mousewheel.", this); + MOZ_ASSERT(NS_SUCCEEDED(rv), "Failed to register callback for mousewheel."); +} + +MouseScrollHandler::UserPrefs::~UserPrefs() { + DebugOnly<nsresult> rv = + Preferences::UnregisterPrefixCallback(OnChange, "mousewheel.", this); + MOZ_ASSERT(NS_SUCCEEDED(rv), "Failed to unregister callback for mousewheel."); +} + +void MouseScrollHandler::UserPrefs::Init() { + if (mInitialized) { + return; + } + + mInitialized = true; + + mScrollMessageHandledAsWheelMessage = + Preferences::GetBool("mousewheel.emulate_at_wm_scroll", false); + mEnableSystemSettingCache = + Preferences::GetBool("mousewheel.system_settings_cache.enabled", true); + mForceEnableSystemSettingCache = Preferences::GetBool( + "mousewheel.system_settings_cache.force_enabled", false); + mEmulateToMakeWindowUnderCursorForeground = Preferences::GetBool( + "mousewheel.debug.make_window_under_cursor_foreground", false); + mOverriddenVerticalScrollAmount = + Preferences::GetInt("mousewheel.windows.vertical_amount_override", -1); + mOverriddenHorizontalScrollAmount = + Preferences::GetInt("mousewheel.windows.horizontal_amount_override", -1); + mMouseScrollTransactionTimeout = Preferences::GetInt( + "mousewheel.windows.transaction.timeout", DEFAULT_TIMEOUT_DURATION); + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::UserPrefs::Init(): initialized, " + "mScrollMessageHandledAsWheelMessage=%s, " + "mEnableSystemSettingCache=%s, " + "mForceEnableSystemSettingCache=%s, " + "mEmulateToMakeWindowUnderCursorForeground=%s, " + "mOverriddenVerticalScrollAmount=%d, " + "mOverriddenHorizontalScrollAmount=%d, " + "mMouseScrollTransactionTimeout=%d", + GetBoolName(mScrollMessageHandledAsWheelMessage), + GetBoolName(mEnableSystemSettingCache), + GetBoolName(mForceEnableSystemSettingCache), + GetBoolName(mEmulateToMakeWindowUnderCursorForeground), + mOverriddenVerticalScrollAmount, mOverriddenHorizontalScrollAmount, + mMouseScrollTransactionTimeout)); +} + +void MouseScrollHandler::UserPrefs::MarkDirty() { + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScrollHandler::UserPrefs::MarkDirty(): Marking UserPrefs dirty")); + mInitialized = false; + // Some prefs might override system settings, so, we should mark them dirty. + MouseScrollHandler::sInstance->mSystemSettings.MarkDirty(); + // When user prefs for mousewheel are changed, we should reset current + // transaction. + MOZ_ASSERT(sInstance, + "Must not be called at initializing MouseScrollHandler"); + MouseScrollHandler::sInstance->mLastEventInfo.ResetTransaction(); +} + +/****************************************************************************** + * + * Device + * + ******************************************************************************/ + +/* static */ +bool MouseScrollHandler::Device::GetWorkaroundPref(const char* aPrefName, + bool aValueIfAutomatic) { + if (!aPrefName) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::GetWorkaroundPref(): Failed, aPrefName is " + "NULL")); + return aValueIfAutomatic; + } + + int32_t lHackValue = 0; + if (NS_FAILED(Preferences::GetInt(aPrefName, &lHackValue))) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::GetWorkaroundPref(): Preferences::GetInt() " + "failed," + " aPrefName=\"%s\", aValueIfAutomatic=%s", + aPrefName, GetBoolName(aValueIfAutomatic))); + return aValueIfAutomatic; + } + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::GetWorkaroundPref(): Succeeded, " + "aPrefName=\"%s\", aValueIfAutomatic=%s, lHackValue=%d", + aPrefName, GetBoolName(aValueIfAutomatic), lHackValue)); + + switch (lHackValue) { + case 0: // disabled + return false; + case 1: // enabled + return true; + default: // -1: autodetect + return aValueIfAutomatic; + } +} + +/* static */ +void MouseScrollHandler::Device::Init() { + // FYI: Thinkpad's TrackPoint is Apoint of Alps and UltraNav is SynTP of + // Synaptics. So, those drivers' information should be initialized + // before calling methods of TrackPoint and UltraNav. + SynTP::Init(); + Elantech::Init(); + Apoint::Init(); + + sFakeScrollableWindowNeeded = GetWorkaroundPref( + "ui.trackpoint_hack.enabled", (TrackPoint::IsDriverInstalled() || + UltraNav::IsObsoleteDriverInstalled())); + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::Init(): sFakeScrollableWindowNeeded=%s", + GetBoolName(sFakeScrollableWindowNeeded))); +} + +/****************************************************************************** + * + * Device::SynTP + * + ******************************************************************************/ + +/* static */ +void MouseScrollHandler::Device::SynTP::Init() { + if (sInitialized) { + return; + } + + sInitialized = true; + sMajorVersion = 0; + sMinorVersion = -1; + + wchar_t buf[40]; + bool foundKey = WinUtils::GetRegistryKey( + HKEY_LOCAL_MACHINE, L"Software\\Synaptics\\SynTP\\Install", + L"DriverVersion", buf, sizeof buf); + if (!foundKey) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::SynTP::Init(): " + "SynTP driver is not found")); + return; + } + + sMajorVersion = wcstol(buf, nullptr, 10); + sMinorVersion = 0; + wchar_t* p = wcschr(buf, L'.'); + if (p) { + sMinorVersion = wcstol(p + 1, nullptr, 10); + } + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::SynTP::Init(): " + "found driver version = %d.%d", + sMajorVersion, sMinorVersion)); +} + +/****************************************************************************** + * + * Device::Elantech + * + ******************************************************************************/ + +/* static */ +void MouseScrollHandler::Device::Elantech::Init() { + int32_t version = GetDriverMajorVersion(); + bool needsHack = Device::GetWorkaroundPref( + "ui.elantech_gesture_hacks.enabled", version != 0); + sUseSwipeHack = needsHack && version <= 7; + sUsePinchHack = needsHack && version <= 8; + + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::Elantech::Init(): version=%d, sUseSwipeHack=%s, " + "sUsePinchHack=%s", + version, GetBoolName(sUseSwipeHack), GetBoolName(sUsePinchHack))); +} + +/* static */ +int32_t MouseScrollHandler::Device::Elantech::GetDriverMajorVersion() { + wchar_t buf[40]; + // The driver version is found in one of these two registry keys. + bool foundKey = WinUtils::GetRegistryKey(HKEY_CURRENT_USER, + L"Software\\Elantech\\MainOption", + L"DriverVersion", buf, sizeof buf); + if (!foundKey) { + foundKey = + WinUtils::GetRegistryKey(HKEY_CURRENT_USER, L"Software\\Elantech", + L"DriverVersion", buf, sizeof buf); + } + + if (!foundKey) { + return 0; + } + + // Assume that the major version number can be found just after a space + // or at the start of the string. + for (wchar_t* p = buf; *p; p++) { + if (*p >= L'0' && *p <= L'9' && (p == buf || *(p - 1) == L' ')) { + return wcstol(p, nullptr, 10); + } + } + + return 0; +} + +/* static */ +bool MouseScrollHandler::Device::Elantech::IsHelperWindow(HWND aWnd) { + // The helper window cannot be distinguished based on its window class, so we + // need to check if it is owned by the helper process, ETDCtrl.exe. + + const wchar_t* filenameSuffix = L"\\etdctrl.exe"; + const int filenameSuffixLength = 12; + + DWORD pid; + ::GetWindowThreadProcessId(aWnd, &pid); + + HANDLE hProcess = ::OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid); + if (!hProcess) { + return false; + } + + bool result = false; + wchar_t path[256] = {L'\0'}; + if (::GetProcessImageFileNameW(hProcess, path, ArrayLength(path))) { + int pathLength = lstrlenW(path); + if (pathLength >= filenameSuffixLength) { + if (lstrcmpiW(path + pathLength - filenameSuffixLength, filenameSuffix) == + 0) { + result = true; + } + } + } + ::CloseHandle(hProcess); + + return result; +} + +/* static */ +bool MouseScrollHandler::Device::Elantech::HandleKeyMessage(nsWindow* aWidget, + UINT aMsg, + WPARAM aWParam, + LPARAM aLParam) { + // The Elantech touchpad driver understands three-finger swipe left and + // right gestures, and translates them into Page Up and Page Down key + // events for most applications. For Firefox 3.6, it instead sends + // Alt+Left and Alt+Right to trigger browser back/forward actions. As + // with the Thinkpad Driver hack in nsWindow::Create, the change in + // HWND structure makes Firefox not trigger the driver's heuristics + // any longer. + // + // The Elantech driver actually sends these messages for a three-finger + // swipe right: + // + // WM_KEYDOWN virtual_key = 0xCC or 0xFF ScanCode = 00 + // WM_KEYDOWN virtual_key = VK_NEXT ScanCode = 00 + // WM_KEYUP virtual_key = VK_NEXT ScanCode = 00 + // WM_KEYUP virtual_key = 0xCC or 0xFF ScanCode = 00 + // + // Whether 0xCC or 0xFF is sent is suspected to depend on the driver + // version. 7.0.4.12_14Jul09_WHQL, 7.0.5.10, and 7.0.6.0 generate 0xCC. + // 7.0.4.3 from Asus on EeePC generates 0xFF. + // + // On some hardware, IS_VK_DOWN(0xFF) returns true even when Elantech + // messages are not involved, meaning that alone is not enough to + // distinguish the gesture from a regular Page Up or Page Down key press. + // The ScanCode is therefore also tested to detect the gesture. + // We then pretend that we should dispatch "Go Forward" command. Similarly + // for VK_PRIOR and "Go Back" command. + if (sUseSwipeHack && (aWParam == VK_NEXT || aWParam == VK_PRIOR) && + WinUtils::GetScanCode(aLParam) == 0 && + (IS_VK_DOWN(0xFF) || IS_VK_DOWN(0xCC))) { + if (aMsg == WM_KEYDOWN) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::Elantech::HandleKeyMessage(): Dispatching " + "%s command event", + aWParam == VK_NEXT ? "Forward" : "Back")); + + WidgetCommandEvent appCommandEvent( + true, (aWParam == VK_NEXT) ? nsGkAtoms::Forward : nsGkAtoms::Back, + aWidget); + + // In this scenario, the coordinate of the event isn't supplied, so pass + // nullptr as an argument to indicate using the coordinate from the last + // available window message. + InitEvent(aWidget, appCommandEvent, nullptr); + aWidget->DispatchWindowEvent(appCommandEvent); + } else { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::Elantech::HandleKeyMessage(): Consumed")); + } + return true; // consume the message (doesn't need to dispatch key events) + } + + // Version 8 of the Elantech touchpad driver sends these messages for + // zoom gestures: + // + // WM_KEYDOWN virtual_key = 0xCC time = 10 + // WM_KEYDOWN virtual_key = VK_CONTROL time = 10 + // WM_MOUSEWHEEL time = ::GetTickCount() + // WM_KEYUP virtual_key = VK_CONTROL time = 10 + // WM_KEYUP virtual_key = 0xCC time = 10 + // + // The result of this is that we process all of the WM_KEYDOWN/WM_KEYUP + // messages first because their timestamps make them appear to have + // been sent before the WM_MOUSEWHEEL message. To work around this, + // we store the current time when we process the WM_KEYUP message and + // assume that any WM_MOUSEWHEEL message with a timestamp before that + // time is one that should be processed as if the Control key was down. + if (sUsePinchHack && aMsg == WM_KEYUP && aWParam == VK_CONTROL && + ::GetMessageTime() == 10) { + // We look only at the bottom 31 bits of the system tick count since + // GetMessageTime returns a LONG, which is signed, so we want values + // that are more easily comparable. + sZoomUntil = ::GetTickCount() & 0x7FFFFFFF; + + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::Elantech::HandleKeyMessage(): sZoomUntil=%lu", + sZoomUntil)); + } + + return false; +} + +/* static */ +void MouseScrollHandler::Device::Elantech::UpdateZoomUntil() { + if (!sZoomUntil) { + return; + } + + // For the Elantech Touchpad Zoom Gesture Hack, we should check that the + // system time (32-bit milliseconds) hasn't wrapped around. Otherwise we + // might get into the situation where wheel events for the next 50 days of + // system uptime are assumed to be Ctrl+Wheel events. (It is unlikely that + // we would get into that state, because the system would already need to be + // up for 50 days and the Control key message would need to be processed just + // before the system time overflow and the wheel message just after.) + // + // We also take the chance to reset sZoomUntil if we simply have passed that + // time. + LONG msgTime = ::GetMessageTime(); + if ((sZoomUntil >= 0x3fffffffu && DWORD(msgTime) < 0x40000000u) || + (sZoomUntil < DWORD(msgTime))) { + sZoomUntil = 0; + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::Elantech::UpdateZoomUntil(): " + "sZoomUntil was reset")); + } +} + +/* static */ +bool MouseScrollHandler::Device::Elantech::IsZooming() { + // Assume the Control key is down if the Elantech touchpad has sent the + // mis-ordered WM_KEYDOWN/WM_MOUSEWHEEL messages. (See the comment in + // OnKeyUp.) + return (sZoomUntil && static_cast<DWORD>(::GetMessageTime()) < sZoomUntil); +} + +/****************************************************************************** + * + * Device::Apoint + * + ******************************************************************************/ + +/* static */ +void MouseScrollHandler::Device::Apoint::Init() { + if (sInitialized) { + return; + } + + sInitialized = true; + sMajorVersion = 0; + sMinorVersion = -1; + + wchar_t buf[40]; + bool foundKey = + WinUtils::GetRegistryKey(HKEY_LOCAL_MACHINE, L"Software\\Alps\\Apoint", + L"ProductVer", buf, sizeof buf); + if (!foundKey) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::Apoint::Init(): " + "Apoint driver is not found")); + return; + } + + sMajorVersion = wcstol(buf, nullptr, 10); + sMinorVersion = 0; + wchar_t* p = wcschr(buf, L'.'); + if (p) { + sMinorVersion = wcstol(p + 1, nullptr, 10); + } + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::Apoint::Init(): " + "found driver version = %d.%d", + sMajorVersion, sMinorVersion)); +} + +/****************************************************************************** + * + * Device::TrackPoint + * + ******************************************************************************/ + +/* static */ +bool MouseScrollHandler::Device::TrackPoint::IsDriverInstalled() { + if (WinUtils::HasRegistryKey(HKEY_CURRENT_USER, + L"Software\\Lenovo\\TrackPoint")) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::TrackPoint::IsDriverInstalled(): " + "Lenovo's TrackPoint driver is found")); + return true; + } + + if (WinUtils::HasRegistryKey(HKEY_CURRENT_USER, + L"Software\\Alps\\Apoint\\TrackPoint")) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::TrackPoint::IsDriverInstalled(): " + "Alps's TrackPoint driver is found")); + } + + return false; +} + +/****************************************************************************** + * + * Device::UltraNav + * + ******************************************************************************/ + +/* static */ +bool MouseScrollHandler::Device::UltraNav::IsObsoleteDriverInstalled() { + if (WinUtils::HasRegistryKey(HKEY_CURRENT_USER, + L"Software\\Lenovo\\UltraNav")) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::UltraNav::IsObsoleteDriverInstalled(): " + "Lenovo's UltraNav driver is found")); + return true; + } + + bool installed = false; + if (WinUtils::HasRegistryKey(HKEY_CURRENT_USER, + L"Software\\Synaptics\\SynTPEnh\\UltraNavUSB")) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::UltraNav::IsObsoleteDriverInstalled(): " + "Synaptics's UltraNav (USB) driver is found")); + installed = true; + } else if (WinUtils::HasRegistryKey( + HKEY_CURRENT_USER, + L"Software\\Synaptics\\SynTPEnh\\UltraNavPS2")) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::UltraNav::IsObsoleteDriverInstalled(): " + "Synaptics's UltraNav (PS/2) driver is found")); + installed = true; + } + + if (!installed) { + return false; + } + + int32_t majorVersion = Device::SynTP::GetDriverMajorVersion(); + if (!majorVersion) { + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::UltraNav::IsObsoleteDriverInstalled(): " + "Failed to get UltraNav driver version")); + return false; + } + int32_t minorVersion = Device::SynTP::GetDriverMinorVersion(); + return majorVersion < 15 || (majorVersion == 15 && minorVersion == 0); +} + +/****************************************************************************** + * + * Device::SetPoint + * + ******************************************************************************/ + +/* static */ +bool MouseScrollHandler::Device::SetPoint::IsGetMessagePosResponseValid( + UINT aMessage, WPARAM aWParam, LPARAM aLParam) { + if (aMessage != WM_MOUSEHWHEEL) { + return false; + } + + POINTS pts = MouseScrollHandler::GetCurrentMessagePos(); + LPARAM messagePos = MAKELPARAM(pts.x, pts.y); + + // XXX We should check whether SetPoint is installed or not by registry. + + // SetPoint, Logitech (Logicool) mouse driver, (confirmed with 4.82.11 and + // MX-1100) always sets 0 to the lParam of WM_MOUSEHWHEEL. The driver SENDs + // one message at first time, this time, ::GetMessagePos() works fine. + // Then, we will return 0 (0 means we process it) to the message. Then, the + // driver will POST the same messages continuously during the wheel tilted. + // But ::GetMessagePos() API always returns (0, 0) for them, even if the + // actual mouse cursor isn't 0,0. Therefore, we cannot trust the result of + // ::GetMessagePos API if the sender is SetPoint. + if (!sMightBeUsing && !aLParam && aLParam != messagePos && + ::InSendMessage()) { + sMightBeUsing = true; + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::SetPoint::IsGetMessagePosResponseValid(): " + "Might using SetPoint")); + } else if (sMightBeUsing && aLParam != 0 && ::InSendMessage()) { + // The user has changed the mouse from Logitech's to another one (e.g., + // the user has changed to the touchpad of the notebook. + sMightBeUsing = false; + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScroll::Device::SetPoint::IsGetMessagePosResponseValid(): " + "Might stop using SetPoint")); + } + return (sMightBeUsing && !aLParam && !messagePos); +} + +/****************************************************************************** + * + * SynthesizingEvent + * + ******************************************************************************/ + +/* static */ +bool MouseScrollHandler::SynthesizingEvent::IsSynthesizing() { + return MouseScrollHandler::sInstance && + MouseScrollHandler::sInstance->mSynthesizingEvent && + MouseScrollHandler::sInstance->mSynthesizingEvent->mStatus != + NOT_SYNTHESIZING; +} + +nsresult MouseScrollHandler::SynthesizingEvent::Synthesize( + const POINTS& aCursorPoint, HWND aWnd, UINT aMessage, WPARAM aWParam, + LPARAM aLParam, const BYTE (&aKeyStates)[256]) { + MOZ_LOG( + gMouseScrollLog, LogLevel::Info, + ("MouseScrollHandler::SynthesizingEvent::Synthesize(): aCursorPoint: { " + "x: %d, y: %d }, aWnd=0x%p, aMessage=0x%04X, aWParam=0x%08zX, " + "aLParam=0x%08" PRIXLPTR ", IsSynthesized()=%s, mStatus=%s", + aCursorPoint.x, aCursorPoint.y, aWnd, aMessage, aWParam, aLParam, + GetBoolName(IsSynthesizing()), GetStatusName())); + + if (IsSynthesizing()) { + return NS_ERROR_NOT_AVAILABLE; + } + + ::GetKeyboardState(mOriginalKeyState); + + // Note that we cannot use ::SetCursorPos() because it works asynchronously. + // We should SEND the message for reducing the possibility of receiving + // unexpected message which were not sent from here. + mCursorPoint = aCursorPoint; + + mWnd = aWnd; + mMessage = aMessage; + mWParam = aWParam; + mLParam = aLParam; + + memcpy(mKeyState, aKeyStates, sizeof(mKeyState)); + ::SetKeyboardState(mKeyState); + + mStatus = SENDING_MESSAGE; + + // Don't assume that aWnd is always managed by nsWindow. It might be + // a plugin window. + ::SendMessage(aWnd, aMessage, aWParam, aLParam); + + return NS_OK; +} + +void MouseScrollHandler::SynthesizingEvent::NativeMessageReceived( + nsWindow* aWidget, UINT aMessage, WPARAM aWParam, LPARAM aLParam) { + if (mStatus == SENDING_MESSAGE && mMessage == aMessage && + mWParam == aWParam && mLParam == aLParam) { + mStatus = NATIVE_MESSAGE_RECEIVED; + if (aWidget && aWidget->GetWindowHandle() == mWnd) { + return; + } + // Otherwise, the message may not be sent by us. + } + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScrollHandler::SynthesizingEvent::NativeMessageReceived(): " + "aWidget=%p, aWidget->GetWindowHandle()=0x%p, mWnd=0x%p, " + "aMessage=0x%04X, aWParam=0x%08zX, aLParam=0x%08" PRIXLPTR + ", mStatus=%s", + aWidget, aWidget ? aWidget->GetWindowHandle() : nullptr, mWnd, + aMessage, aWParam, aLParam, GetStatusName())); + + // We failed to receive our sent message, we failed to do the job. + Finish(); + + return; +} + +void MouseScrollHandler::SynthesizingEvent:: + NotifyNativeMessageHandlingFinished() { + if (!IsSynthesizing()) { + return; + } + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScrollHandler::SynthesizingEvent::" + "NotifyNativeMessageHandlingFinished(): IsWaitingInternalMessage=%s", + GetBoolName(MouseScrollHandler::IsWaitingInternalMessage()))); + + if (MouseScrollHandler::IsWaitingInternalMessage()) { + mStatus = INTERNAL_MESSAGE_POSTED; + return; + } + + // If the native message handler didn't post our internal message, + // we our job is finished. + // TODO: When we post the message to plugin window, there is remaning job. + Finish(); +} + +void MouseScrollHandler::SynthesizingEvent:: + NotifyInternalMessageHandlingFinished() { + if (!IsSynthesizing()) { + return; + } + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScrollHandler::SynthesizingEvent::" + "NotifyInternalMessageHandlingFinished()")); + + Finish(); +} + +void MouseScrollHandler::SynthesizingEvent::Finish() { + if (!IsSynthesizing()) { + return; + } + + MOZ_LOG(gMouseScrollLog, LogLevel::Info, + ("MouseScrollHandler::SynthesizingEvent::Finish()")); + + // Restore the original key state. + ::SetKeyboardState(mOriginalKeyState); + + mStatus = NOT_SYNTHESIZING; +} + +} // namespace widget +} // namespace mozilla |