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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /widget/windows/WinMouseScrollHandler.cpp
parentInitial commit. (diff)
downloadfirefox-esr-upstream.tar.xz
firefox-esr-upstream.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--widget/windows/WinMouseScrollHandler.cpp1668
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