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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/. */
#ifdef MOZ_LOGGING
#define FORCE_PR_LOG /* Allow logging in the release build */
#endif // MOZ_LOGGING
#include "prlog.h"
#include "WinMouseScrollHandler.h"
#include "nsWindow.h"
#include "KeyboardLayout.h"
#include "WinUtils.h"
#include "nsGkAtoms.h"
#include "nsIDOMWindowUtils.h"
#include "mozilla/Preferences.h"
#include <psapi.h>
namespace mozilla {
namespace widget {
#ifdef PR_LOGGING
PRLogModuleInfo* gMouseScrollLog = nullptr;
static const char* GetBoolName(bool aBool)
{
return aBool ? "TRUE" : "FALSE";
}
static void LogKeyStateImpl()
{
if (!PR_LOG_TEST(gMouseScrollLog, PR_LOG_DEBUG)) {
return;
}
BYTE keyboardState[256];
if (::GetKeyboardState(keyboardState)) {
for (size_t i = 0; i < ArrayLength(keyboardState); i++) {
if (keyboardState[i]) {
PR_LOG(gMouseScrollLog, PR_LOG_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 {
PR_LOG(gMouseScrollLog, PR_LOG_DEBUG,
("MouseScroll::Device::Elantech::HandleKeyMessage(): Failed to print "
"current keyboard state"));
}
}
#define LOG_KEYSTATE() LogKeyStateImpl()
#else // PR_LOGGING
#define LOG_KEYSTATE()
#endif
MouseScrollHandler* MouseScrollHandler::sInstance = nullptr;
bool MouseScrollHandler::Device::sFakeScrollableWindowNeeded = false;
bool MouseScrollHandler::Device::Elantech::sUseSwipeHack = false;
bool MouseScrollHandler::Device::Elantech::sUsePinchHack = false;
DWORD MouseScrollHandler::Device::Elantech::sZoomUntil = 0;
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()
{
#ifdef PR_LOGGING
if (!gMouseScrollLog) {
gMouseScrollLog = PR_NewLogModule("MouseScrollHandlerWidgets");
}
#endif
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)
{
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll: Creating an instance, this=%p, sInstance=%p",
this, sInstance));
}
MouseScrollHandler::~MouseScrollHandler()
{
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll: Destroying an instance, this=%p, sInstance=%p",
this, sInstance));
delete mSynthesizingEvent;
}
/* static */
bool
MouseScrollHandler::ProcessMessage(nsWindow* aWindow, UINT msg,
WPARAM wParam, LPARAM lParam,
LRESULT *aRetValue, bool &aEatMessage)
{
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(aWindow, 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.
aEatMessage = true;
*aRetValue = (msg != WM_MOUSEHWHEEL);
return true;
case WM_HSCROLL:
case WM_VSCROLL:
aEatMessage =
GetInstance()->ProcessNativeScrollMessage(aWindow, msg, wParam, lParam);
sInstance->mSynthesizingEvent->NotifyNativeMessageHandlingFinished();
*aRetValue = 0;
return true;
case MOZ_WM_MOUSEVWHEEL:
case MOZ_WM_MOUSEHWHEEL:
GetInstance()->HandleMouseWheelMessage(aWindow, msg, wParam, lParam);
sInstance->mSynthesizingEvent->NotifyInternalMessageHandlingFinished();
// Doesn't need to call next wndproc for internal wheel message.
aEatMessage = true;
return true;
case MOZ_WM_HSCROLL:
case MOZ_WM_VSCROLL:
GetInstance()->
HandleScrollMessageAsMouseWheelMessage(aWindow, msg, wParam, lParam);
sInstance->mSynthesizingEvent->NotifyInternalMessageHandlingFinished();
// Doesn't need to call next wndproc for internal scroll message.
aEatMessage = true;
return true;
case WM_KEYDOWN:
case WM_KEYUP:
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::ProcessMessage(): aWindow=%p, "
"msg=%s(0x%04X), wParam=0x%02X, ::GetMessageTime()=%d",
aWindow, msg == WM_KEYDOWN ? "WM_KEYDOWN" :
msg == WM_KEYUP ? "WM_KEYUP" : "Unknown", msg, wParam,
::GetMessageTime()));
LOG_KEYSTATE();
if (Device::Elantech::HandleKeyMessage(aWindow, msg, wParam)) {
*aRetValue = 0;
aEatMessage = true;
return true;
}
return false;
default:
return false;
}
}
/* static */
nsresult
MouseScrollHandler::SynthesizeNativeMouseScrollEvent(nsWindow* aWindow,
const nsIntPoint& aPoint,
PRUint32 aNativeMessage,
PRInt32 aDelta,
PRUint32 aModifierFlags,
PRUint32 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) : NULL;
wParam = aDelta;
break;
default:
return NS_ERROR_INVALID_ARG;
}
// Ensure to make the instance.
GetInstance();
BYTE kbdState[256];
memset(kbdState, 0, sizeof(kbdState));
nsAutoTArray<KeyPair,10> keySequence;
nsWindow::SetupKeyModifiersSequence(&keySequence, aModifierFlags);
for (PRUint32 i = 0; i < keySequence.Length(); ++i) {
PRUint8 key = keySequence[i].mGeneral;
PRUint8 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 */
bool
MouseScrollHandler::DispatchEvent(nsWindow* aWindow, nsGUIEvent& aEvent)
{
return aWindow->DispatchWindowEvent(&aEvent);
}
/* static */
void
MouseScrollHandler::InitEvent(nsWindow* aWindow,
nsGUIEvent& aEvent,
nsIntPoint* aPoint)
{
NS_ENSURE_TRUE(aWindow, );
nsIntPoint point;
if (aPoint) {
point = *aPoint;
} else {
POINTS pts = GetCurrentMessagePos();
POINT pt;
pt.x = pts.x;
pt.y = pts.y;
::ScreenToClient(aWindow->GetWindowHandle(), &pt);
point.x = pt.x;
point.y = pt.y;
}
aWindow->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)) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::ComputeMessagePos: Using ::GetCursorPos()"));
::GetCursorPos(&point);
} else {
POINTS pts = GetCurrentMessagePos();
point.x = pts.x;
point.y = pts.y;
}
return point;
}
MouseScrollHandler::ScrollTargetInfo
MouseScrollHandler::GetScrollTargetInfo(
nsWindow* aWindow,
const EventInfo& aEventInfo,
const ModifierKeyState& aModifierKeyState)
{
ScrollTargetInfo result;
result.dispatchPixelScrollEvent = false;
result.reversePixelScrollDirection = false;
result.actualScrollAmount = aEventInfo.GetScrollAmount();
result.actualScrollAction = nsQueryContentEvent::SCROLL_ACTION_NONE;
result.pixelsPerUnit = 0;
if (!mUserPrefs.IsPixelScrollingEnabled()) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::GetPixelScrollInfo: Succeeded, aWindow=%p, "
"result: { dispatchPixelScrollEvent: %s, actualScrollAmount: %d }",
aWindow, GetBoolName(result.dispatchPixelScrollEvent),
result.actualScrollAmount));
return result;
}
nsMouseScrollEvent testEvent(true, NS_MOUSE_SCROLL, aWindow);
InitEvent(aWindow, testEvent);
aModifierKeyState.InitInputEvent(testEvent);
testEvent.scrollFlags = aEventInfo.GetScrollFlags();
testEvent.delta = result.actualScrollAmount;
if ((aEventInfo.IsVertical() && aEventInfo.IsPositive()) ||
(!aEventInfo.IsVertical() && !aEventInfo.IsPositive())) {
testEvent.delta *= -1;
}
nsQueryContentEvent queryEvent(true, NS_QUERY_SCROLL_TARGET_INFO, aWindow);
InitEvent(aWindow, queryEvent);
queryEvent.InitForQueryScrollTargetInfo(&testEvent);
DispatchEvent(aWindow, queryEvent);
// If the necessary interger isn't larger than 0, we should assume that
// the event failed for us.
if (!queryEvent.mSucceeded) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::GetPixelScrollInfo: Failed to query the "
"scroll target information, aWindow=%p"
"result: { dispatchPixelScrollEvent: %s, actualScrollAmount: %d }",
aWindow, GetBoolName(result.dispatchPixelScrollEvent),
result.actualScrollAmount));
return result;
}
result.actualScrollAction = queryEvent.mReply.mComputedScrollAction;
if (result.actualScrollAction == nsQueryContentEvent::SCROLL_ACTION_PAGE) {
result.pixelsPerUnit =
aEventInfo.IsVertical() ? queryEvent.mReply.mPageHeight :
queryEvent.mReply.mPageWidth;
} else {
result.pixelsPerUnit = queryEvent.mReply.mLineHeight;
}
result.actualScrollAmount = queryEvent.mReply.mComputedScrollAmount;
if (result.pixelsPerUnit > 0 && result.actualScrollAmount != 0 &&
result.actualScrollAction != nsQueryContentEvent::SCROLL_ACTION_NONE) {
result.dispatchPixelScrollEvent = true;
// If original delta's sign and computed delta's one are different,
// we need to reverse the pixel scroll direction at dispatching it.
result.reversePixelScrollDirection =
(testEvent.delta > 0 && result.actualScrollAmount < 0) ||
(testEvent.delta < 0 && result.actualScrollAmount > 0);
// scroll amount must be positive.
result.actualScrollAmount = NS_ABS(result.actualScrollAmount);
}
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::GetPixelScrollInfo: Succeeded, aWindow=%p, "
"result: { dispatchPixelScrollEvent: %s, reversePixelScrollDirection: %s, "
"actualScrollAmount: %d, actualScrollAction: 0x%01X, "
"pixelsPerUnit: %d }",
aWindow, GetBoolName(result.dispatchPixelScrollEvent),
GetBoolName(result.reversePixelScrollDirection), result.actualScrollAmount,
result.actualScrollAction, result.pixelsPerUnit));
return result;
}
void
MouseScrollHandler::ProcessNativeMouseWheelMessage(nsWindow* aWindow,
UINT aMessage,
WPARAM aWParam,
LPARAM aLParam)
{
if (SynthesizingEvent::IsSynthesizing()) {
mSynthesizingEvent->NativeMessageReceived(aWindow, aMessage,
aWParam, aLParam);
}
POINT point = ComputeMessagePos(aMessage, aWParam, aLParam);
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::ProcessNativeMouseWheelMessage: aWindow=%p, "
"aMessage=%s, wParam=0x%08X, lParam=0x%08X, point: { x=%d, y=%d }",
aWindow, aMessage == WM_MOUSEWHEEL ? "WM_MOUSEWHEEL" :
aMessage == WM_MOUSEHWHEEL ? "WM_MOUSEHWHEEL" :
aMessage == WM_VSCROLL ? "WM_VSCROLL" : "WM_HSCROLL",
aWParam, aLParam, point.x, point.y));
LOG_KEYSTATE();
HWND underCursorWnd = ::WindowFromPoint(point);
if (!underCursorWnd) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("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) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("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) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("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) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("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->GetWindowType() == eWindowType_plugin) {
destWindow = destWindow->GetParentWindow(false);
if (!destWindow) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::ProcessNativeMouseWheelMessage: "
"Our window which is a parent of a plugin window is not found"));
return;
}
}
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("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.
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("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 (aWindow->GetWindowType() == eWindowType_plugin &&
aWindow->GetWindowHandle() == pluginWnd) {
nsWindow* destWindow = aWindow->GetParentWindow(false);
if (!destWindow) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::ProcessNativeMouseWheelMessage: Our normal window which "
"is a parent of this plugin window is not found"));
return;
}
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("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.
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::ProcessNativeMouseWheelMessage: Succeeded, "
"Redirecting the message to a window which is a plugin child window"));
::PostMessage(underCursorWnd, aMessage, aWParam, aLParam);
}
bool
MouseScrollHandler::ProcessNativeScrollMessage(nsWindow* aWindow,
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(aWindow, aMessage, aWParam, aLParam);
// Always consume the scroll message if we try to emulate mouse wheel
// action.
return true;
}
if (SynthesizingEvent::IsSynthesizing()) {
mSynthesizingEvent->NativeMessageReceived(aWindow, aMessage,
aWParam, aLParam);
}
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::ProcessNativeScrollMessage: aWindow=%p, "
"aMessage=%s, wParam=0x%08X, lParam=0x%08X",
aWindow, aMessage == WM_VSCROLL ? "WM_VSCROLL" : "WM_HSCROLL",
aWParam, aLParam));
// Scroll message generated by external application
nsContentCommandEvent commandEvent(true, NS_CONTENT_COMMAND_SCROLL, aWindow);
commandEvent.mScroll.mIsHorizontal = (aMessage == WM_HSCROLL);
switch (LOWORD(aWParam)) {
case SB_LINEUP: // SB_LINELEFT
commandEvent.mScroll.mUnit = nsContentCommandEvent::eCmdScrollUnit_Line;
commandEvent.mScroll.mAmount = -1;
break;
case SB_LINEDOWN: // SB_LINERIGHT
commandEvent.mScroll.mUnit = nsContentCommandEvent::eCmdScrollUnit_Line;
commandEvent.mScroll.mAmount = 1;
break;
case SB_PAGEUP: // SB_PAGELEFT
commandEvent.mScroll.mUnit = nsContentCommandEvent::eCmdScrollUnit_Page;
commandEvent.mScroll.mAmount = -1;
break;
case SB_PAGEDOWN: // SB_PAGERIGHT
commandEvent.mScroll.mUnit = nsContentCommandEvent::eCmdScrollUnit_Page;
commandEvent.mScroll.mAmount = 1;
break;
case SB_TOP: // SB_LEFT
commandEvent.mScroll.mUnit = nsContentCommandEvent::eCmdScrollUnit_Whole;
commandEvent.mScroll.mAmount = -1;
break;
case SB_BOTTOM: // SB_RIGHT
commandEvent.mScroll.mUnit = nsContentCommandEvent::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.
DispatchEvent(aWindow, commandEvent);
return true;
}
void
MouseScrollHandler::HandleMouseWheelMessage(nsWindow* aWindow,
UINT aMessage,
WPARAM aWParam,
LPARAM aLParam)
{
NS_ABORT_IF_FALSE(
(aMessage == MOZ_WM_MOUSEVWHEEL || aMessage == MOZ_WM_MOUSEHWHEEL),
"HandleMouseWheelMessage must be called with "
"MOZ_WM_MOUSEVWHEEL or MOZ_WM_MOUSEHWHEEL");
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::HandleMouseWheelMessage: aWindow=%p, "
"aMessage=MOZ_WM_MOUSE%sWHEEL, aWParam=0x%08X, aLParam=0x%08X",
aWindow, aMessage == MOZ_WM_MOUSEVWHEEL ? "V" : "H",
aWParam, aLParam));
mIsWaitingInternalMessage = false;
EventInfo eventInfo(aWindow, WinUtils::GetNativeMessage(aMessage),
aWParam, aLParam);
if (!eventInfo.CanDispatchMouseScrollEvent()) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("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);
// Before dispatching line scroll event, we should get the current scroll
// event target information for pixel scroll.
ScrollTargetInfo scrollTargetInfo =
GetScrollTargetInfo(aWindow, eventInfo, modKeyState);
// Grab the widget, it might be destroyed by a DOM event handler.
nsRefPtr<nsWindow> kungFuDethGrip(aWindow);
bool fromLines = false;
nsMouseScrollEvent scrollEvent(true, NS_MOUSE_SCROLL, aWindow);
if (mLastEventInfo.InitMouseScrollEvent(aWindow, scrollEvent,
scrollTargetInfo, modKeyState)) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::HandleMouseWheelMessage: dispatching "
"NS_MOUSE_SCROLL event"));
fromLines = true;
DispatchEvent(aWindow, scrollEvent);
if (aWindow->Destroyed()) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::HandleMouseWheelMessage: The window was destroyed "
"by NS_MOUSE_SCROLL event"));
mLastEventInfo.ResetTransaction();
return;
}
}
#ifdef PR_LOGGING
else {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::HandleMouseWheelMessage: NS_MOUSE_SCROLL event is not "
"dispatched"));
}
#endif
nsMouseScrollEvent pixelEvent(true, NS_MOUSE_PIXEL_SCROLL, aWindow);
if (mLastEventInfo.InitMousePixelScrollEvent(aWindow, pixelEvent,
scrollTargetInfo, modKeyState)) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::HandleMouseWheelMessage: dispatching "
"NS_MOUSE_PIXEL_SCROLL event"));
pixelEvent.scrollFlags |= fromLines ? nsMouseScrollEvent::kFromLines : 0;
DispatchEvent(aWindow, pixelEvent);
if (aWindow->Destroyed()) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::HandleMouseWheelMessage: The window was destroyed "
"by NS_MOUSE_PIXEL_SCROLL event"));
mLastEventInfo.ResetTransaction();
return;
}
}
#ifdef PR_LOGGING
else {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::HandleMouseWheelMessage: NS_MOUSE_PIXEL_SCROLL event is "
"not dispatched"));
}
#endif
}
void
MouseScrollHandler::HandleScrollMessageAsMouseWheelMessage(nsWindow* aWindow,
UINT aMessage,
WPARAM aWParam,
LPARAM aLParam)
{
NS_ABORT_IF_FALSE(
(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);
nsMouseScrollEvent scrollEvent(true, NS_MOUSE_SCROLL, aWindow);
scrollEvent.scrollFlags =
(aMessage == MOZ_WM_VSCROLL) ? nsMouseScrollEvent::kIsVertical :
nsMouseScrollEvent::kIsHorizontal;
switch (LOWORD(aWParam)) {
case SB_PAGEDOWN:
scrollEvent.scrollFlags |= nsMouseScrollEvent::kIsFullPage;
case SB_LINEDOWN:
scrollEvent.delta = 1;
break;
case SB_PAGEUP:
scrollEvent.scrollFlags |= nsMouseScrollEvent::kIsFullPage;
case SB_LINEUP:
scrollEvent.delta = -1;
break;
default:
return;
}
modKeyState.InitInputEvent(scrollEvent);
// 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(aWindow, scrollEvent);
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::HandleScrollMessageAsMouseWheelMessage: aWindow=%p, "
"aMessage=MOZ_WM_%sSCROLL, aWParam=0x%08X, aLParam=0x%08X, "
"scrollEvent { refPoint: { x: %d, y: %d }, delta: %d, "
"scrollFlags: 0x%04X, isShift: %s, isControl: %s, isAlt: %s, isMeta: %s }",
aWindow, (aMessage == MOZ_WM_VSCROLL) ? "V" : "H",
aWParam, aLParam, scrollEvent.refPoint.x, scrollEvent.refPoint.y,
scrollEvent.delta, scrollEvent.scrollFlags,
GetBoolName(scrollEvent.IsShift()),
GetBoolName(scrollEvent.IsControl()),
GetBoolName(scrollEvent.IsAlt()),
GetBoolName(scrollEvent.IsMeta())));
DispatchEvent(aWindow, scrollEvent);
}
/******************************************************************************
*
* EventInfo
*
******************************************************************************/
MouseScrollHandler::EventInfo::EventInfo(nsWindow* aWindow,
UINT aMessage,
WPARAM aWParam, LPARAM aLParam)
{
NS_ABORT_IF_FALSE(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 = aWindow->GetWindowHandle();
mTimeStamp = TimeStamp::Now();
}
bool
MouseScrollHandler::EventInfo::CanDispatchMouseScrollEvent() 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);
}
PRInt32
MouseScrollHandler::EventInfo::GetScrollAmount() const
{
if (mIsPage) {
return 1;
}
return MouseScrollHandler::sInstance->
mSystemSettings.GetScrollAmount(mIsVertical);
}
PRInt32
MouseScrollHandler::EventInfo::GetScrollFlags() const
{
PRInt32 result = mIsPage ? nsMouseScrollEvent::kIsFullPage : 0;
result |= mIsVertical ? nsMouseScrollEvent::kIsVertical :
nsMouseScrollEvent::kIsHorizontal;
return result;
}
/******************************************************************************
*
* LastEventInfo
*
******************************************************************************/
bool
MouseScrollHandler::LastEventInfo::CanContinueTransaction(
const EventInfo& aNewEvent)
{
PRInt32 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;
}
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::LastEventInfo::ResetTransaction()"));
mWnd = nullptr;
mRemainingDeltaForScroll = 0;
mRemainingDeltaForPixel = 0;
}
void
MouseScrollHandler::LastEventInfo::RecordEvent(const EventInfo& aEvent)
{
mWnd = aEvent.GetWindowHandle();
mDelta = aEvent.GetNativeDelta();
mIsVertical = aEvent.IsVertical();
mIsPage = aEvent.IsPage();
mTimeStamp = TimeStamp::Now();
}
/* static */
PRInt32
MouseScrollHandler::LastEventInfo::RoundDelta(double aDelta)
{
return (aDelta >= 0) ? (PRInt32)floor(aDelta) : (PRInt32)ceil(aDelta);
}
bool
MouseScrollHandler::LastEventInfo::InitMouseScrollEvent(
nsWindow* aWindow,
nsMouseScrollEvent& aMouseScrollEvent,
const ScrollTargetInfo& aScrollTargetInfo,
const ModifierKeyState& aModKeyState)
{
NS_ABORT_IF_FALSE(aMouseScrollEvent.message == NS_MOUSE_SCROLL,
"aMouseScrollEvent must be NS_MOUSE_SCROLL");
// 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(aWindow, aMouseScrollEvent);
aModKeyState.InitInputEvent(aMouseScrollEvent);
// If we dispatch pixel scroll event after the line scroll event,
// we should set kHasPixels flag to the line scroll event.
aMouseScrollEvent.scrollFlags =
aScrollTargetInfo.dispatchPixelScrollEvent ?
nsMouseScrollEvent::kHasPixels : 0;
aMouseScrollEvent.scrollFlags |= GetScrollFlags();
// 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.
PRInt32 orienter = mIsVertical ? -1 : 1;
// NOTE: Don't use aScrollTargetInfo.actualScrollAmount for computing the
// delta value of line/page scroll event. The value will be recomputed
// in ESM.
PRInt32 nativeDelta = mDelta + mRemainingDeltaForScroll;
if (IsPage()) {
aMouseScrollEvent.delta = nativeDelta * orienter / WHEEL_DELTA;
PRInt32 recomputedNativeDelta =
aMouseScrollEvent.delta * orienter / WHEEL_DELTA;
mRemainingDeltaForScroll = nativeDelta - recomputedNativeDelta;
} else {
double deltaPerUnit = (double)WHEEL_DELTA / GetScrollAmount();
aMouseScrollEvent.delta =
RoundDelta((double)nativeDelta * orienter / deltaPerUnit);
PRInt32 recomputedNativeDelta =
(PRInt32)(aMouseScrollEvent.delta * orienter * deltaPerUnit);
mRemainingDeltaForScroll = nativeDelta - recomputedNativeDelta;
}
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::LastEventInfo::InitMouseScrollEvent: aWindow=%p, "
"aMouseScrollEvent { refPoint: { x: %d, y: %d }, delta: %d, "
"scrollFlags: 0x%04X, isShift: %s, isControl: %s, isAlt: %s, "
"isMeta: %s }, mRemainingDeltaForScroll: %d",
aWindow, aMouseScrollEvent.refPoint.x, aMouseScrollEvent.refPoint.y,
aMouseScrollEvent.delta, aMouseScrollEvent.scrollFlags,
GetBoolName(aMouseScrollEvent.IsShift()),
GetBoolName(aMouseScrollEvent.IsControl()),
GetBoolName(aMouseScrollEvent.IsAlt()),
GetBoolName(aMouseScrollEvent.IsMeta()), mRemainingDeltaForScroll));
return (aMouseScrollEvent.delta != 0);
}
bool
MouseScrollHandler::LastEventInfo::InitMousePixelScrollEvent(
nsWindow* aWindow,
nsMouseScrollEvent& aPixelScrollEvent,
const ScrollTargetInfo& aScrollTargetInfo,
const ModifierKeyState& aModKeyState)
{
NS_ABORT_IF_FALSE(aPixelScrollEvent.message == NS_MOUSE_PIXEL_SCROLL,
"aPixelScrollEvent must be NS_MOUSE_PIXEL_SCROLL");
if (!aScrollTargetInfo.dispatchPixelScrollEvent) {
PR_LOG(gMouseScrollLog, PR_LOG_ALWAYS,
("MouseScroll::LastEventInfo::InitMousePixelScrollEvent: aWindow=%p, "
"PixelScroll is disabled",
aWindow, mRemainingDeltaForPixel));
mRemainingDeltaForPixel = 0;
return false;
}
// 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.