gecko-dev/widget/windows/nsWinGesture.cpp

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C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* nsWinGesture - Touch input handling for tablet displays.
*/
#include "nscore.h"
#include "nsWinGesture.h"
#include "nsUXThemeData.h"
#include "nsIDOMSimpleGestureEvent.h"
#include "nsGUIEvent.h"
#include "nsIDOMWheelEvent.h"
#include "mozilla/Constants.h"
#include "mozilla/Preferences.h"
using namespace mozilla;
using namespace mozilla::widget;
#ifdef PR_LOGGING
extern PRLogModuleInfo* gWindowsLog;
#endif
const PRUnichar nsWinGesture::kGestureLibraryName[] = L"user32.dll";
HMODULE nsWinGesture::sLibraryHandle = nullptr;
nsWinGesture::GetGestureInfoPtr nsWinGesture::getGestureInfo = nullptr;
nsWinGesture::CloseGestureInfoHandlePtr nsWinGesture::closeGestureInfoHandle = nullptr;
nsWinGesture::GetGestureExtraArgsPtr nsWinGesture::getGestureExtraArgs = nullptr;
nsWinGesture::SetGestureConfigPtr nsWinGesture::setGestureConfig = nullptr;
nsWinGesture::GetGestureConfigPtr nsWinGesture::getGestureConfig = nullptr;
nsWinGesture::BeginPanningFeedbackPtr nsWinGesture::beginPanningFeedback = nullptr;
nsWinGesture::EndPanningFeedbackPtr nsWinGesture::endPanningFeedback = nullptr;
nsWinGesture::UpdatePanningFeedbackPtr nsWinGesture::updatePanningFeedback = nullptr;
nsWinGesture::RegisterTouchWindowPtr nsWinGesture::registerTouchWindow = nullptr;
nsWinGesture::UnregisterTouchWindowPtr nsWinGesture::unregisterTouchWindow = nullptr;
nsWinGesture::GetTouchInputInfoPtr nsWinGesture::getTouchInputInfo = nullptr;
nsWinGesture::CloseTouchInputHandlePtr nsWinGesture::closeTouchInputHandle = nullptr;
static bool gEnableSingleFingerPanEvents = false;
nsWinGesture::nsWinGesture() :
mPanActive(false),
mFeedbackActive(false),
mXAxisFeedback(false),
mYAxisFeedback(false),
mPanInertiaActive(false)
{
(void)InitLibrary();
mPixelScrollOverflow = 0;
}
/* Load and shutdown */
bool nsWinGesture::InitLibrary()
{
if (getGestureInfo) {
return true;
} else if (sLibraryHandle) {
return false;
}
sLibraryHandle = ::LoadLibraryW(kGestureLibraryName);
HMODULE hTheme = nsUXThemeData::GetThemeDLL();
// gesture interfaces
if (sLibraryHandle) {
getGestureInfo = (GetGestureInfoPtr)GetProcAddress(sLibraryHandle, "GetGestureInfo");
closeGestureInfoHandle = (CloseGestureInfoHandlePtr)GetProcAddress(sLibraryHandle, "CloseGestureInfoHandle");
getGestureExtraArgs = (GetGestureExtraArgsPtr)GetProcAddress(sLibraryHandle, "GetGestureExtraArgs");
setGestureConfig = (SetGestureConfigPtr)GetProcAddress(sLibraryHandle, "SetGestureConfig");
getGestureConfig = (GetGestureConfigPtr)GetProcAddress(sLibraryHandle, "GetGestureConfig");
registerTouchWindow = (RegisterTouchWindowPtr)GetProcAddress(sLibraryHandle, "RegisterTouchWindow");
unregisterTouchWindow = (UnregisterTouchWindowPtr)GetProcAddress(sLibraryHandle, "UnregisterTouchWindow");
getTouchInputInfo = (GetTouchInputInfoPtr)GetProcAddress(sLibraryHandle, "GetTouchInputInfo");
closeTouchInputHandle = (CloseTouchInputHandlePtr)GetProcAddress(sLibraryHandle, "CloseTouchInputHandle");
}
if (!getGestureInfo || !closeGestureInfoHandle || !getGestureExtraArgs ||
!setGestureConfig || !getGestureConfig) {
getGestureInfo = nullptr;
closeGestureInfoHandle = nullptr;
getGestureExtraArgs = nullptr;
setGestureConfig = nullptr;
getGestureConfig = nullptr;
return false;
}
if (!registerTouchWindow || !unregisterTouchWindow || !getTouchInputInfo || !closeTouchInputHandle) {
registerTouchWindow = nullptr;
unregisterTouchWindow = nullptr;
getTouchInputInfo = nullptr;
closeTouchInputHandle = nullptr;
}
// panning feedback interfaces
if (hTheme) {
beginPanningFeedback = (BeginPanningFeedbackPtr)GetProcAddress(hTheme, "BeginPanningFeedback");
endPanningFeedback = (EndPanningFeedbackPtr)GetProcAddress(hTheme, "EndPanningFeedback");
updatePanningFeedback = (UpdatePanningFeedbackPtr)GetProcAddress(hTheme, "UpdatePanningFeedback");
}
if (!beginPanningFeedback || !endPanningFeedback || !updatePanningFeedback) {
beginPanningFeedback = nullptr;
endPanningFeedback = nullptr;
updatePanningFeedback = nullptr;
}
// Check to see if we want single finger gesture input. Only do this once
// for the app so we don't have to look it up on every window create.
gEnableSingleFingerPanEvents =
Preferences::GetBool("gestures.enable_single_finger_input", false);
return true;
}
#define GCOUNT 5
bool nsWinGesture::SetWinGestureSupport(HWND hWnd, nsGestureNotifyEvent::ePanDirection aDirection)
{
if (!getGestureInfo)
return false;
GESTURECONFIG config[GCOUNT];
memset(&config, 0, sizeof(config));
config[0].dwID = GID_ZOOM;
config[0].dwWant = GC_ZOOM;
config[0].dwBlock = 0;
config[1].dwID = GID_ROTATE;
config[1].dwWant = GC_ROTATE;
config[1].dwBlock = 0;
config[2].dwID = GID_PAN;
config[2].dwWant = GC_PAN|GC_PAN_WITH_INERTIA|
GC_PAN_WITH_GUTTER;
config[2].dwBlock = GC_PAN_WITH_SINGLE_FINGER_VERTICALLY|
GC_PAN_WITH_SINGLE_FINGER_HORIZONTALLY;
if (gEnableSingleFingerPanEvents) {
if (aDirection == nsGestureNotifyEvent::ePanVertical ||
aDirection == nsGestureNotifyEvent::ePanBoth)
{
config[2].dwWant |= GC_PAN_WITH_SINGLE_FINGER_VERTICALLY;
config[2].dwBlock -= GC_PAN_WITH_SINGLE_FINGER_VERTICALLY;
}
if (aDirection == nsGestureNotifyEvent::ePanHorizontal ||
aDirection == nsGestureNotifyEvent::ePanBoth)
{
config[2].dwWant |= GC_PAN_WITH_SINGLE_FINGER_HORIZONTALLY;
config[2].dwBlock -= GC_PAN_WITH_SINGLE_FINGER_HORIZONTALLY;
}
}
config[3].dwWant = GC_TWOFINGERTAP;
config[3].dwID = GID_TWOFINGERTAP;
config[3].dwBlock = 0;
config[4].dwWant = GC_PRESSANDTAP;
config[4].dwID = GID_PRESSANDTAP;
config[4].dwBlock = 0;
return SetGestureConfig(hWnd, GCOUNT, (PGESTURECONFIG)&config);
}
/* Helpers */
bool nsWinGesture::IsAvailable()
{
return getGestureInfo != nullptr;
}
bool nsWinGesture::RegisterTouchWindow(HWND hWnd)
{
if (!registerTouchWindow)
return false;
return registerTouchWindow(hWnd, TWF_WANTPALM);
}
bool nsWinGesture::UnregisterTouchWindow(HWND hWnd)
{
if (!unregisterTouchWindow)
return false;
return unregisterTouchWindow(hWnd);
}
bool nsWinGesture::GetTouchInputInfo(HTOUCHINPUT hTouchInput, uint32_t cInputs, PTOUCHINPUT pInputs)
{
if (!getTouchInputInfo)
return false;
return getTouchInputInfo(hTouchInput, cInputs, pInputs, sizeof(TOUCHINPUT));
}
bool nsWinGesture::CloseTouchInputHandle(HTOUCHINPUT hTouchInput)
{
if (!closeTouchInputHandle)
return false;
return closeTouchInputHandle(hTouchInput);
}
bool nsWinGesture::GetGestureInfo(HGESTUREINFO hGestureInfo, PGESTUREINFO pGestureInfo)
{
if (!getGestureInfo || !hGestureInfo || !pGestureInfo)
return false;
ZeroMemory(pGestureInfo, sizeof(GESTUREINFO));
pGestureInfo->cbSize = sizeof(GESTUREINFO);
return getGestureInfo(hGestureInfo, pGestureInfo);
}
bool nsWinGesture::CloseGestureInfoHandle(HGESTUREINFO hGestureInfo)
{
if (!getGestureInfo || !hGestureInfo)
return false;
return closeGestureInfoHandle(hGestureInfo);
}
bool nsWinGesture::GetGestureExtraArgs(HGESTUREINFO hGestureInfo, UINT cbExtraArgs, PBYTE pExtraArgs)
{
if (!getGestureInfo || !hGestureInfo || !pExtraArgs)
return false;
return getGestureExtraArgs(hGestureInfo, cbExtraArgs, pExtraArgs);
}
bool nsWinGesture::SetGestureConfig(HWND hWnd, UINT cIDs, PGESTURECONFIG pGestureConfig)
{
if (!getGestureInfo || !pGestureConfig)
return false;
return setGestureConfig(hWnd, 0, cIDs, pGestureConfig, sizeof(GESTURECONFIG));
}
bool nsWinGesture::GetGestureConfig(HWND hWnd, DWORD dwFlags, PUINT pcIDs, PGESTURECONFIG pGestureConfig)
{
if (!getGestureInfo || !pGestureConfig)
return false;
return getGestureConfig(hWnd, 0, dwFlags, pcIDs, pGestureConfig, sizeof(GESTURECONFIG));
}
bool nsWinGesture::BeginPanningFeedback(HWND hWnd)
{
if (!beginPanningFeedback)
return false;
return beginPanningFeedback(hWnd);
}
bool nsWinGesture::EndPanningFeedback(HWND hWnd)
{
if (!beginPanningFeedback)
return false;
return endPanningFeedback(hWnd, TRUE);
}
bool nsWinGesture::UpdatePanningFeedback(HWND hWnd, LONG offsetX, LONG offsetY, BOOL fInInertia)
{
if (!beginPanningFeedback)
return false;
return updatePanningFeedback(hWnd, offsetX, offsetY, fInInertia);
}
bool nsWinGesture::IsPanEvent(LPARAM lParam)
{
GESTUREINFO gi;
ZeroMemory(&gi,sizeof(GESTUREINFO));
gi.cbSize = sizeof(GESTUREINFO);
BOOL result = GetGestureInfo((HGESTUREINFO)lParam, &gi);
if (!result)
return false;
if (gi.dwID == GID_PAN)
return true;
return false;
}
/* Gesture event processing */
bool
nsWinGesture::ProcessGestureMessage(HWND hWnd, WPARAM wParam, LPARAM lParam, nsSimpleGestureEvent& evt)
{
GESTUREINFO gi;
ZeroMemory(&gi,sizeof(GESTUREINFO));
gi.cbSize = sizeof(GESTUREINFO);
BOOL result = GetGestureInfo((HGESTUREINFO)lParam, &gi);
if (!result)
return false;
// The coordinates of this event
nsPointWin coord;
coord = gi.ptsLocation;
coord.ScreenToClient(hWnd);
evt.refPoint.x = coord.x;
evt.refPoint.y = coord.y;
// Multiple gesture can occur at the same time so gesture state
// info can't be shared.
switch(gi.dwID)
{
case GID_BEGIN:
case GID_END:
// These should always fall through to DefWndProc
return false;
break;
case GID_ZOOM:
{
if (gi.dwFlags & GF_BEGIN) {
// Send a zoom start event
// The low 32 bits are the distance in pixels.
mZoomIntermediate = (float)gi.ullArguments;
evt.message = NS_SIMPLE_GESTURE_MAGNIFY_START;
evt.delta = 0.0;
}
else if (gi.dwFlags & GF_END) {
// Send a zoom end event, the delta is the change
// in touch points.
evt.message = NS_SIMPLE_GESTURE_MAGNIFY;
// (positive for a "zoom in")
evt.delta = -1.0 * (mZoomIntermediate - (float)gi.ullArguments);
mZoomIntermediate = (float)gi.ullArguments;
}
else {
// Send a zoom intermediate event, the delta is the change
// in touch points.
evt.message = NS_SIMPLE_GESTURE_MAGNIFY_UPDATE;
// (positive for a "zoom in")
evt.delta = -1.0 * (mZoomIntermediate - (float)gi.ullArguments);
mZoomIntermediate = (float)gi.ullArguments;
}
}
break;
case GID_ROTATE:
{
// Send a rotate start event
double radians = 0.0;
// On GF_BEGIN, ullArguments contains the absolute rotation at the
// start of the gesture. In later events it contains the offset from
// the start angle.
if (gi.ullArguments != 0)
radians = GID_ROTATE_ANGLE_FROM_ARGUMENT(gi.ullArguments);
double degrees = -1 * radians * (180/M_PI);
if (gi.dwFlags & GF_BEGIN) {
// At some point we should pass the initial angle in
// along with delta. It's useful.
degrees = mRotateIntermediate = 0.0;
}
evt.direction = 0;
evt.delta = degrees - mRotateIntermediate;
mRotateIntermediate = degrees;
if (evt.delta > 0)
evt.direction = nsIDOMSimpleGestureEvent::ROTATION_COUNTERCLOCKWISE;
else if (evt.delta < 0)
evt.direction = nsIDOMSimpleGestureEvent::ROTATION_CLOCKWISE;
if (gi.dwFlags & GF_BEGIN)
evt.message = NS_SIMPLE_GESTURE_ROTATE_START;
else if (gi.dwFlags & GF_END)
evt.message = NS_SIMPLE_GESTURE_ROTATE;
else
evt.message = NS_SIMPLE_GESTURE_ROTATE_UPDATE;
}
break;
case GID_TWOFINGERTAP:
{
// Normally maps to "restore" from whatever you may have recently changed. A simple
// double click.
evt.message = NS_SIMPLE_GESTURE_TAP;
evt.clickCount = 1;
}
break;
case GID_PRESSANDTAP:
{
// Two finger right click. Defaults to right click if it falls through.
evt.message = NS_SIMPLE_GESTURE_PRESSTAP;
evt.clickCount = 1;
}
break;
}
return true;
}
bool
nsWinGesture::ProcessPanMessage(HWND hWnd, WPARAM wParam, LPARAM lParam)
{
GESTUREINFO gi;
ZeroMemory(&gi,sizeof(GESTUREINFO));
gi.cbSize = sizeof(GESTUREINFO);
BOOL result = GetGestureInfo((HGESTUREINFO)lParam, &gi);
if (!result)
return false;
// The coordinates of this event
nsPointWin coord;
coord = mPanRefPoint = gi.ptsLocation;
// We want screen coordinates in our local offsets as client coordinates will change
// when feedback is taking place. Gui events though require client coordinates.
mPanRefPoint.ScreenToClient(hWnd);
switch(gi.dwID)
{
case GID_BEGIN:
case GID_END:
// These should always fall through to DefWndProc
return false;
break;
// Setup pixel scroll events for both axis
case GID_PAN:
{
if (gi.dwFlags & GF_BEGIN) {
mPanIntermediate = coord;
mPixelScrollDelta = 0;
mPanActive = true;
mPanInertiaActive = false;
}
else {
#ifdef DBG_jimm
int32_t deltaX = mPanIntermediate.x - coord.x;
int32_t deltaY = mPanIntermediate.y - coord.y;
PR_LOG(gWindowsLog, PR_LOG_ALWAYS,
("coordX=%d coordY=%d deltaX=%d deltaY=%d x:%d y:%d\n", coord.x,
coord.y, deltaX, deltaY, mXAxisFeedback, mYAxisFeedback));
#endif
mPixelScrollDelta.x = mPanIntermediate.x - coord.x;
mPixelScrollDelta.y = mPanIntermediate.y - coord.y;
mPanIntermediate = coord;
if (gi.dwFlags & GF_INERTIA)
mPanInertiaActive = true;
if (gi.dwFlags & GF_END) {
mPanActive = false;
mPanInertiaActive = false;
PanFeedbackFinalize(hWnd, true);
}
}
}
break;
}
return true;
}
inline bool TestTransition(int32_t a, int32_t b)
{
// If a is zero, overflow is zero, implying the cursor has moved back to the start position.
// If b is zero, cached overscroll is zero, implying feedback just begun.
if (a == 0 || b == 0) return true;
// Test for different signs.
return (a < 0) == (b < 0);
}
void
nsWinGesture::UpdatePanFeedbackX(HWND hWnd, int32_t scrollOverflow, bool& endFeedback)
{
// If scroll overflow was returned indicating we panned past the bounds of
// the scrollable view port, start feeback.
if (scrollOverflow != 0) {
if (!mFeedbackActive) {
BeginPanningFeedback(hWnd);
mFeedbackActive = true;
}
endFeedback = false;
mXAxisFeedback = true;
return;
}
if (mXAxisFeedback) {
int32_t newOverflow = mPixelScrollOverflow.x - mPixelScrollDelta.x;
// Detect a reverse transition past the starting drag point. This tells us the user
// has panned all the way back so we can stop providing feedback for this axis.
if (!TestTransition(newOverflow, mPixelScrollOverflow.x) || newOverflow == 0)
return;
// Cache the total over scroll in pixels.
mPixelScrollOverflow.x = newOverflow;
endFeedback = false;
}
}
void
nsWinGesture::UpdatePanFeedbackY(HWND hWnd, int32_t scrollOverflow, bool& endFeedback)
{
// If scroll overflow was returned indicating we panned past the bounds of
// the scrollable view port, start feeback.
if (scrollOverflow != 0) {
if (!mFeedbackActive) {
BeginPanningFeedback(hWnd);
mFeedbackActive = true;
}
endFeedback = false;
mYAxisFeedback = true;
return;
}
if (mYAxisFeedback) {
int32_t newOverflow = mPixelScrollOverflow.y - mPixelScrollDelta.y;
// Detect a reverse transition past the starting drag point. This tells us the user
// has panned all the way back so we can stop providing feedback for this axis.
if (!TestTransition(newOverflow, mPixelScrollOverflow.y) || newOverflow == 0)
return;
// Cache the total over scroll in pixels.
mPixelScrollOverflow.y = newOverflow;
endFeedback = false;
}
}
void
nsWinGesture::PanFeedbackFinalize(HWND hWnd, bool endFeedback)
{
if (!mFeedbackActive)
return;
if (endFeedback) {
mFeedbackActive = false;
mXAxisFeedback = false;
mYAxisFeedback = false;
mPixelScrollOverflow = 0;
EndPanningFeedback(hWnd);
return;
}
UpdatePanningFeedback(hWnd, mPixelScrollOverflow.x, mPixelScrollOverflow.y, mPanInertiaActive);
}
bool
nsWinGesture::PanDeltaToPixelScroll(WheelEvent& aWheelEvent)
{
aWheelEvent.deltaX = aWheelEvent.deltaY = aWheelEvent.deltaZ = 0.0;
aWheelEvent.lineOrPageDeltaX = aWheelEvent.lineOrPageDeltaY = 0;
aWheelEvent.refPoint.x = mPanRefPoint.x;
aWheelEvent.refPoint.y = mPanRefPoint.y;
aWheelEvent.deltaMode = nsIDOMWheelEvent::DOM_DELTA_PIXEL;
aWheelEvent.scrollType = WheelEvent::SCROLL_SYNCHRONOUSLY;
aWheelEvent.isPixelOnlyDevice = true;
aWheelEvent.overflowDeltaX = 0.0;
aWheelEvent.overflowDeltaY = 0.0;
// Don't scroll the view if we are currently at a bounds, or, if we are
// panning back from a max feedback position. This keeps the original drag point
// constant.
if (!mXAxisFeedback) {
aWheelEvent.deltaX = mPixelScrollDelta.x;
}
if (!mYAxisFeedback) {
aWheelEvent.deltaY = mPixelScrollDelta.y;
}
return (aWheelEvent.deltaX != 0 || aWheelEvent.deltaY != 0);
}