src/plugins/platforms/windows/qwindowsmousehandler.cpp

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  41
  42 #include "qwindowsmousehandler.h"
  43 #include "qwindowskeymapper.h"
  44 #include "qwindowscontext.h"
  45 #include "qwindowswindow.h"
  46 #include "qwindowsintegration.h"
  47
  48 #include <QtGui/qwindowsysteminterface.h>
  49 #include <QtGui/QGuiApplication>
  50 #include <QtGui/QScreen>
  51
  52 #include <QtCore/QDebug>
  53 #include <QtCore/QScopedArrayPointer>
  54
  55 #include <windowsx.h>
  56
  57 QT_BEGIN_NAMESPACE
  58
  59 static inline void compressMouseMove(MSG *msg)
  60 {
  61     // Compress mouse move events
  62     if (msg->message == WM_MOUSEMOVE) {
  63         MSG mouseMsg;
  64         while (PeekMessage(&mouseMsg, msg->hwnd, WM_MOUSEFIRST,
  65                            WM_MOUSELAST, PM_NOREMOVE)) {
  66             if (mouseMsg.message == WM_MOUSEMOVE) {
  67 #define PEEKMESSAGE_IS_BROKEN 1
  68 #ifdef PEEKMESSAGE_IS_BROKEN
  69                 // Since the Windows PeekMessage() function doesn't
  70                 // correctly return the wParam for WM_MOUSEMOVE events
  71                 // if there is a key release event in the queue
  72                 // _before_ the mouse event, we have to also consider
  73                 // key release events (kls 2003-05-13):
  74                 MSG keyMsg;
  75                 bool done = false;
  76                 while (PeekMessage(&keyMsg, 0, WM_KEYFIRST, WM_KEYLAST,
  77                                    PM_NOREMOVE)) {
  78                     if (keyMsg.time < mouseMsg.time) {
  79                         if ((keyMsg.lParam & 0xC0000000) == 0x40000000) {
  80                             PeekMessage(&keyMsg, 0, keyMsg.message,
  81                                         keyMsg.message, PM_REMOVE);
  82                         } else {
  83                             done = true;
  84                             break;
  85                         }
  86                     } else {
  87                         break; // no key event before the WM_MOUSEMOVE event
  88                     }
  89                 }
  90                 if (done)
  91                     break;
  92 #else
  93                 // Actually the following 'if' should work instead of
  94                 // the above key event checking, but apparently
  95                 // PeekMessage() is broken :-(
  96                 if (mouseMsg.wParam != msg.wParam)
  97                     break; // leave the message in the queue because
  98                 // the key state has changed
  99 #endif
 100                 // Update the passed in MSG structure with the
 101                 // most recent one.
 102                 msg->lParam = mouseMsg.lParam;
 103                 msg->wParam = mouseMsg.wParam;
 104                 // Extract the x,y coordinates from the lParam as we do in the WndProc
 105                 msg->pt.x = GET_X_LPARAM(mouseMsg.lParam);
 106                 msg->pt.y = GET_Y_LPARAM(mouseMsg.lParam);
 107                 ClientToScreen(msg->hwnd, &(msg->pt));
 108                 // Remove the mouse move message
 109                 PeekMessage(&mouseMsg, msg->hwnd, WM_MOUSEMOVE,
 110                             WM_MOUSEMOVE, PM_REMOVE);
 111             } else {
 112                 break; // there was no more WM_MOUSEMOVE event
 113             }
 114         }
 115     }
 116 }
 117
 118 /*!
 119     \class QWindowsMouseHandler
 120     \brief Windows mouse handler
 121
 122     Dispatches mouse and touch events. Separate for code cleanliness.
 123
 124     \internal
 125     \ingroup qt-lighthouse-win
 126 */
 127
 128 QWindowsMouseHandler::QWindowsMouseHandler() :
 129     m_windowUnderMouse(0),
 130     m_touchDevice(0)
 131 {
 132 }
 133
 134 Qt::MouseButtons QWindowsMouseHandler::queryMouseButtons()
 135 {
 136     Qt::MouseButtons result = 0;
 137     const bool mouseSwapped = GetSystemMetrics(SM_SWAPBUTTON);
 138     if (GetAsyncKeyState(VK_LBUTTON) < 0)
 139         result |= mouseSwapped ? Qt::RightButton: Qt::LeftButton;
 140     if (GetAsyncKeyState(VK_RBUTTON) < 0)
 141         result |= mouseSwapped ? Qt::LeftButton : Qt::RightButton;
 142     if (GetAsyncKeyState(VK_MBUTTON) < 0)
 143         result |= Qt::MidButton;
 144     return result;
 145 }
 146
 147 bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
 148                                                QtWindows::WindowsEventType et,
 149                                                MSG msg, LRESULT *result)
 150 {
 151     if (et == QtWindows::MouseWheelEvent)
 152         return translateMouseWheelEvent(window, hwnd, msg, result);
 153
 154     const QPoint winEventPosition(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
 155     if (et & QtWindows::NonClientEventFlag) {
 156         const QPoint globalPosition = winEventPosition;
 157         const QPoint clientPosition = QWindowsGeometryHint::mapFromGlobal(hwnd, globalPosition);
 158         const Qt::MouseButtons buttons = QWindowsMouseHandler::queryMouseButtons();
 159         QWindowSystemInterface::handleFrameStrutMouseEvent(window, clientPosition,
 160                                                            globalPosition, buttons,
 161                                                            QWindowsKeyMapper::queryKeyboardModifiers());
 162         return false; // Allow further event processing (dragging of windows).
 163     }
 164
 165     *result = 0;
 166     if (msg.message == WM_MOUSELEAVE) {
 167         // When moving out of a child, MouseMove within parent is received first
 168         // (see below)
 169         if (QWindowsContext::verboseEvents)
 170             qDebug() << "WM_MOUSELEAVE for " << window << " current= " << m_windowUnderMouse;
 171         if (window == m_windowUnderMouse) {
 172             QWindowSystemInterface::handleLeaveEvent(window);
 173             m_windowUnderMouse = 0;
 174         }
 175         return true;
 176     }
 177     compressMouseMove(&msg);
 178     // Eat mouse move after size grip drag.
 179     if (msg.message == WM_MOUSEMOVE) {
 180         QWindowsWindow *platformWindow = static_cast<QWindowsWindow *>(window->handle());
 181         if (platformWindow->testFlag(QWindowsWindow::SizeGripOperation)) {
 182             MSG mouseMsg;
 183             while (PeekMessage(&mouseMsg, platformWindow->handle(), WM_MOUSEMOVE, WM_MOUSEMOVE, PM_REMOVE)) ;
 184             platformWindow->clearFlag(QWindowsWindow::SizeGripOperation);
 185             return true;
 186         }
 187     }
 188     // Enter new window: track to generate leave event.
 189     if (m_windowUnderMouse != window) {
 190         // The tracking on m_windowUnderMouse might still be active and
 191         // trigger later on.
 192         if (m_windowUnderMouse) {
 193             if (QWindowsContext::verboseEvents)
 194                 qDebug() << "Synthetic leave for " << m_windowUnderMouse;
 195             QWindowSystemInterface::handleLeaveEvent(m_windowUnderMouse);
 196         }
 197         m_windowUnderMouse = window;
 198         if (QWindowsContext::verboseEvents)
 199             qDebug() << "Entering " << window;
 200         QWindowsWindow::baseWindowOf(window)->applyCursor();
 201 //#ifndef Q_OS_WINCE
 202         QWindowSystemInterface::handleEnterEvent(window);
 203 #ifndef Q_OS_WINCE
 204         TRACKMOUSEEVENT tme;
 205         tme.cbSize = sizeof(TRACKMOUSEEVENT);
 206         tme.dwFlags = TME_LEAVE;
 207         tme.hwndTrack = hwnd;
 208         tme.dwHoverTime = HOVER_DEFAULT; //
 209         if (!TrackMouseEvent(&tme))
 210             qWarning("TrackMouseEvent failed.");
 211 #endif // !Q_OS_WINCE
 212     }
 213     const QPoint clientPosition = winEventPosition;
 214     QWindowSystemInterface::handleMouseEvent(window, clientPosition,
 215                                              QWindowsGeometryHint::mapToGlobal(hwnd, clientPosition),
 216                                              keyStateToMouseButtons((int)msg.wParam),
 217                                              QWindowsKeyMapper::queryKeyboardModifiers());
 218     return true;
 219 }
 220
 221 bool QWindowsMouseHandler::translateMouseWheelEvent(QWindow *window, HWND,
 222                                                     MSG msg, LRESULT *)
 223 {
 224     const Qt::MouseButtons buttons = keyStateToMouseButtons((int)msg.wParam);
 225     const Qt::KeyboardModifiers mods = keyStateToModifiers((int)msg.wParam);
 226
 227     int delta;
 228     if (msg.message == WM_MOUSEWHEEL || msg.message == WM_MOUSEHWHEEL)
 229         delta = (short) HIWORD (msg.wParam);
 230     else
 231         delta = (int) msg.wParam;
 232
 233     Qt::Orientation orientation = (msg.message == WM_MOUSEHWHEEL
 234                                   || (buttons & Qt::AltModifier)) ?
 235                                   Qt::Horizontal : Qt::Vertical;
 236
 237     // according to the MSDN documentation on WM_MOUSEHWHEEL:
 238     // a positive value indicates that the wheel was rotated to the right;
 239     // a negative value indicates that the wheel was rotated to the left.
 240     // Qt defines this value as the exact opposite, so we have to flip the value!
 241     if (msg.message == WM_MOUSEHWHEEL)
 242         delta = -delta;
 243
 244     const QPoint globalPos(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
 245     // TODO: if there is a widget under the mouse and it is not shadowed
 246     // QWindow *receiver = windowAt(pos);
 247     // by modality, we send the event to it first.
 248     //synaptics touchpad shows its own widget at this position
 249     //so widgetAt() will fail with that HWND, try child of this widget
 250     // if (!receiver) receiver = window->childAt(pos);
 251     QWindow *receiver = window;
 252     QWindowSystemInterface::handleWheelEvent(receiver,
 253                                              QWindowsGeometryHint::mapFromGlobal(receiver, globalPos),
 254                                              globalPos,
 255                                              delta, orientation, mods);
 256     return true;
 257 }
 258
 259 // from bool QApplicationPrivate::translateTouchEvent()
 260 bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND,
 261                                                QtWindows::WindowsEventType,
 262                                                MSG msg, LRESULT *)
 263 {
 264 #ifndef Q_OS_WINCE
 265     typedef QWindowSystemInterface::TouchPoint QTouchPoint;
 266     typedef QList<QWindowSystemInterface::TouchPoint> QTouchPointList;
 267
 268     const QRect screenGeometry = window->screen()->geometry();
 269
 270     const int winTouchPointCount = msg.wParam;
 271     QScopedArrayPointer<TOUCHINPUT> winTouchInputs(new TOUCHINPUT[winTouchPointCount]);
 272     memset(winTouchInputs.data(), 0, sizeof(TOUCHINPUT) * winTouchPointCount);
 273
 274     QTouchPointList touchPoints;
 275     touchPoints.reserve(winTouchPointCount);
 276     Qt::TouchPointStates allStates = 0;
 277
 278     Q_ASSERT(QWindowsContext::user32dll.getTouchInputInfo);
 279
 280     QWindowsContext::user32dll.getTouchInputInfo((HANDLE) msg.lParam, msg.wParam, winTouchInputs.data(), sizeof(TOUCHINPUT));
 281     for (int i = 0; i < winTouchPointCount; ++i) {
 282         const TOUCHINPUT &winTouchInput = winTouchInputs[i];
 283         QTouchPoint touchPoint;
 284         touchPoint.pressure = 1.0;
 285         touchPoint.id = m_touchInputIDToTouchPointID.value(winTouchInput.dwID, -1);
 286         if (touchPoint.id == -1) {
 287             touchPoint.id = m_touchInputIDToTouchPointID.size();
 288             m_touchInputIDToTouchPointID.insert(winTouchInput.dwID, touchPoint.id);
 289         }
 290
 291         QPointF screenPos = QPointF(qreal(winTouchInput.x) / qreal(100.), qreal(winTouchInput.y) / qreal(100.));
 292         if (winTouchInput.dwMask & TOUCHINPUTMASKF_CONTACTAREA)
 293             touchPoint.area.setSize(QSizeF(qreal(winTouchInput.cxContact) / qreal(100.),
 294                                            qreal(winTouchInput.cyContact) / qreal(100.)));
 295         touchPoint.area.moveCenter(screenPos);
 296
 297         if (winTouchInput.dwFlags & TOUCHEVENTF_DOWN) {
 298             touchPoint.state = Qt::TouchPointPressed;
 299         } else if (winTouchInput.dwFlags & TOUCHEVENTF_UP) {
 300             touchPoint.state = Qt::TouchPointReleased;
 301         } else {
 302             // TODO: Previous code checked"
 303             // screenPos == touchPoint.normalPosition -> Qt::TouchPointStationary, but
 304             // but touchPoint.normalPosition was never initialized?
 305             touchPoint.state = touchPoint.state;
 306         }
 307
 308         touchPoint.normalPosition = QPointF(screenPos.x() / screenGeometry.width(),
 309                                  screenPos.y() / screenGeometry.height());
 310
 311         allStates |= touchPoint.state;
 312
 313         touchPoints.append(touchPoint);
 314     }
 315
 316     QWindowsContext::user32dll.closeTouchInputHandle((HANDLE) msg.lParam);
 317
 318     // all touch points released, forget the ids we've seen, they may not be reused
 319     if (allStates == Qt::TouchPointReleased)
 320         m_touchInputIDToTouchPointID.clear();
 321
 322     if (!m_touchDevice) {
 323         m_touchDevice = new QTouchDevice;
 324         // TODO: Device used to be hardcoded to screen in previous code.
 325         m_touchDevice->setType(QTouchDevice::TouchScreen);
 326         m_touchDevice->setCapabilities(QTouchDevice::Position | QTouchDevice::Area | QTouchDevice::NormalizedPosition);
 327         QWindowSystemInterface::registerTouchDevice(m_touchDevice);
 328     }
 329
 330     QWindowSystemInterface::handleTouchEvent(window,
 331                                              m_touchDevice,
 332                                              touchPoints);
 333     return true;
 334 #else
 335     return false;
 336 #endif
 337 }
 338
 339 QT_END_NAMESPACE