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WinMouseScrollHandler.cpp
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/* -*- 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 "nsIDOMWheelEvent.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/WindowsVersion.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%02X]=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(nsWindowBase* 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%02X, ::GetMessageTime()=%d",
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(nsWindowBase* 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);
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(nsWindowBase* aWidget,
WidgetGUIEvent& aEvent,
LayoutDeviceIntPoint* aPoint)
{
NS_ENSURE_TRUE_VOID(aWidget);
LayoutDeviceIntPoint point;
if (aPoint) {
point = *aPoint;
} else {
POINTS pts = GetCurrentMessagePos();
POINT pt;
pt.x = pts.x;
pt.y = pts.y;
::ScreenToClient(aWidget->GetWindowHandle(), &pt);
point.x = pt.x;
point.y = pt.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()) {
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(nsWindowBase* 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%08X, lParam=0x%08X, point: { x=%d, y=%d }",
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)) {
nsWindowBase* destWindow = WinUtils::GetNSWindowBasePtr(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::GetNSWindowBasePtr(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");
// If the found window is our plugin window, it means that the message
// has been handled by the plugin but not consumed. We should handle the
// message on its parent window. However, note that the DOM event may
// cause accessing the plugin. Therefore, we should unlock the plugin
// process by using PostMessage().
if (destWindow->IsPlugin()) {
destWindow = destWindow->GetParentWindowBase(false);
if (!destWindow) {
MOZ_LOG(gMouseScrollLog, LogLevel::Info,
("MouseScroll::ProcessNativeMouseWheelMessage: "
"Our window which is a parent of a plugin window is not found"));
return;
}
}
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 we're a plugin window (MozillaWindowClass) and cursor in this window,
// the message shouldn't go to plugin's wndproc again. So, we should handle
// it on parent window. However, note that the DOM event may cause accessing
// the plugin. Therefore, we should unlock the plugin process by using
// PostMessage().
if (aWidget->IsPlugin() &&
aWidget->GetWindowHandle() == pluginWnd) {
nsWindowBase* destWindow = aWidget->GetParentWindowBase(false);
if (!destWindow) {
MOZ_LOG(gMouseScrollLog, LogLevel::Info,
("MouseScroll::ProcessNativeMouseWheelMessage: Our normal window which "
"is a parent of this plugin window is not found"));
return;
}
MOZ_LOG(gMouseScrollLog, LogLevel::Info,
("MouseScroll::ProcessNativeMouseWheelMessage: Succeeded, "
"Posting internal message to an nsWindow (%p) which is parent of this "
"plugin window...",
destWindow));
mIsWaitingInternalMessage = true;
UINT internalMessage = WinUtils::GetInternalMessage(aMessage);
::PostMessage(destWindow->GetWindowHandle(), internalMessage,
aWParam, aLParam);
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(nsWindowBase* 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%08X, lParam=0x%08X",
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(nsWindowBase* 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%08X, aLParam=0x%08X",
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<nsWindowBase> kungFuDethGrip(aWidget);
WidgetWheelEvent wheelEvent(true, eWheel, aWidget);
if (mLastEventInfo.InitWheelEvent(aWidget, wheelEvent, modKeyState)) {
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(nsWindowBase* 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;
case SB_PAGEDOWN:
wheelEvent.mDeltaMode = nsIDOMWheelEvent::DOM_DELTA_PAGE;
break;
case SB_LINEUP:
delta = -1.0;
lineOrPageDelta = -1;
case SB_LINEDOWN:
wheelEvent.mDeltaMode = nsIDOMWheelEvent::DOM_DELTA_LINE;
break;
default:
return;
}
modKeyState.InitInputEvent(wheelEvent);
// XXX Current mouse position may not be same as when the original message
// is received. We need to know the actual mouse cursor position when
// the original message was received.
InitEvent(aWidget, wheelEvent);
MOZ_LOG(gMouseScrollLog, LogLevel::Info,
("MouseScroll::HandleScrollMessageAsMouseWheelMessage: aWidget=%p, "
"aMessage=MOZ_WM_%sSCROLL, aWParam=0x%08X, aLParam=0x%08X, "
"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, wheelEvent.mRefPoint.y,
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(nsWindowBase* 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(
nsWindowBase* aWidget,
WidgetWheelEvent& aWheelEvent,
const ModifierKeyState& aModKeyState)
{
MOZ_ASSERT(aWheelEvent.mMessage == eWheel);
// XXX Why don't we use lParam value? We should use lParam value because
// our internal message is always posted by original message handler.
// So, GetMessagePos() may return different cursor position.
InitEvent(aWidget, aWheelEvent);
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 ? nsIDOMWheelEvent::DOM_DELTA_PAGE :
nsIDOMWheelEvent::DOM_DELTA_LINE;
double& delta = mIsVertical ? aWheelEvent.mDeltaY : aWheelEvent.mDeltaX;
int32_t& lineOrPageDelta = mIsVertical ? aWheelEvent.mLineOrPageDeltaY :
aWheelEvent.mLineOrPageDeltaX;
double nativeDeltaPerUnit =
mIsPage ? static_cast<double>(WHEEL_DELTA) :
static_cast<double>(WHEEL_DELTA) / GetScrollAmount();
delta = static_cast<double>(mDelta) * orienter / nativeDeltaPerUnit;
mAccumulatedDelta += mDelta;
lineOrPageDelta =
mAccumulatedDelta * orienter / RoundDelta(nativeDeltaPerUnit);
mAccumulatedDelta -=
lineOrPageDelta * orienter * RoundDelta(nativeDeltaPerUnit);
if (aWheelEvent.mDeltaMode != nsIDOMWheelEvent::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, aWheelEvent.mRefPoint.y,
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, %s",
IsVistaOrLater() ?
"this is unexpected on Vista or later" :
"but on XP or earlier, this is not a problem"));
// XXX Should we use DefaultScrollChars()?
mScrollChars = 1;