Add Windows to the Lighthouse.

Add an initial Lighthouse plugin for the Windows operating system.

Change-Id: I6934562266e1aa0ac270bf6107df05a9e56ef82c
Reviewed-on: http://codereview.qt.nokia.com/3107
Reviewed-by: Oliver Wolff <oliver.wolff@nokia.com>
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

1 files changed, 288 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/qwindowsmousehandler.cpp b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
new file mode 100644
index 0000000000..dea965b439
--- /dev/null
+++ b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
@@ -0,0 +1,288 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwindowsmousehandler.h"
+#include "qwindowscontext.h"
+#include "qwindowswindow.h"
+#include "qwindowsintegration.h"
+
+#include <QtGui/QWindowSystemInterface>
+#include <QtGui/QGuiApplication>
+#include <QtGui/QScreen>
+
+#include <QtCore/QDebug>
+#include <QtCore/QScopedArrayPointer>
+
+#include <windowsx.h>
+
+QT_BEGIN_NAMESPACE
+
+static inline void compressMouseMove(MSG *msg)
+{
+    // Compress mouse move events
+    if (msg->message == WM_MOUSEMOVE) {
+        MSG mouseMsg;
+        while (PeekMessage(&mouseMsg, msg->hwnd, WM_MOUSEFIRST,
+                           WM_MOUSELAST, PM_NOREMOVE)) {
+            if (mouseMsg.message == WM_MOUSEMOVE) {
+#define PEEKMESSAGE_IS_BROKEN 1
+#ifdef PEEKMESSAGE_IS_BROKEN
+                // Since the Windows PeekMessage() function doesn't
+                // correctly return the wParam for WM_MOUSEMOVE events
+                // if there is a key release event in the queue
+                // _before_ the mouse event, we have to also consider
+                // key release events (kls 2003-05-13):
+                MSG keyMsg;
+                bool done = false;
+                while (PeekMessage(&keyMsg, 0, WM_KEYFIRST, WM_KEYLAST,
+                                   PM_NOREMOVE)) {
+                    if (keyMsg.time < mouseMsg.time) {
+                        if ((keyMsg.lParam & 0xC0000000) == 0x40000000) {
+                            PeekMessage(&keyMsg, 0, keyMsg.message,
+                                        keyMsg.message, PM_REMOVE);
+                        } else {
+                            done = true;
+                            break;
+                        }
+                    } else {
+                        break; // no key event before the WM_MOUSEMOVE event
+                    }
+                }
+                if (done)
+                    break;
+#else
+                // Actually the following 'if' should work instead of
+                // the above key event checking, but apparently
+                // PeekMessage() is broken :-(
+                if (mouseMsg.wParam != msg.wParam)
+                    break; // leave the message in the queue because
+                // the key state has changed
+#endif
+                // Update the passed in MSG structure with the
+                // most recent one.
+                msg->lParam = mouseMsg.lParam;
+                msg->wParam = mouseMsg.wParam;
+                // Extract the x,y coordinates from the lParam as we do in the WndProc
+                msg->pt.x = GET_X_LPARAM(mouseMsg.lParam);
+                msg->pt.y = GET_Y_LPARAM(mouseMsg.lParam);
+                ClientToScreen(msg->hwnd, &(msg->pt));
+                // Remove the mouse move message
+                PeekMessage(&mouseMsg, msg->hwnd, WM_MOUSEMOVE,
+                            WM_MOUSEMOVE, PM_REMOVE);
+            } else {
+                break; // there was no more WM_MOUSEMOVE event
+            }
+        }
+    }
+}
+
+/*!
+    \class QWindowsMouseHandler
+    \brief Windows mouse handler
+
+    Dispatches mouse and touch events. Separate for code cleanliness.
+
+    \ingroup qt-lighthouse-win
+*/
+
+QWindowsMouseHandler::QWindowsMouseHandler() :
+    m_windowUnderMouse(0)
+{
+}
+
+bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
+                                               QtWindows::WindowsEventType et,
+                                               MSG msg, LRESULT *result)
+{
+    if (et & QtWindows::NonClientEventFlag)
+        return false;
+    if (et == QtWindows::MouseWheelEvent)
+        return translateMouseWheelEvent(window, hwnd, msg, result);
+    *result = 0;
+    if (msg.message == WM_MOUSELEAVE) {
+        // When moving out of a child, MouseMove within parent is received first
+        // (see below)
+        if (QWindowsContext::verboseEvents)
+            qDebug() << "WM_MOUSELEAVE for " << window << " current= " << m_windowUnderMouse;
+        if (window == m_windowUnderMouse) {
+            QWindowSystemInterface::handleLeaveEvent(window);
+            m_windowUnderMouse = 0;
+        }
+        return true;
+    }
+    compressMouseMove(&msg);
+    const QPoint client(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
+    // Enter new window: track to generate leave event.
+    if (m_windowUnderMouse != window) {
+        // The tracking on m_windowUnderMouse might still be active and
+        // trigger later on.
+        if (m_windowUnderMouse) {
+            if (QWindowsContext::verboseEvents)
+                qDebug() << "Synthetic leave for " << m_windowUnderMouse;
+            QWindowSystemInterface::handleLeaveEvent(m_windowUnderMouse);
+        }
+        m_windowUnderMouse = window;
+        if (QWindowsContext::verboseEvents)
+            qDebug() << "Entering " << window;
+        QWindowsWindow::baseWindowOf(window)->applyCursor();
+        QWindowSystemInterface::handleEnterEvent(window);
+        TRACKMOUSEEVENT tme;
+        tme.cbSize = sizeof(TRACKMOUSEEVENT);
+        tme.dwFlags = TME_LEAVE;
+        tme.hwndTrack = hwnd;
+        tme.dwHoverTime = HOVER_DEFAULT; //
+        if (!TrackMouseEvent(&tme))
+            qWarning("TrackMouseEvent failed.");
+    }
+    QWindowSystemInterface::handleMouseEvent(window, client,
+                                             QWindowsGeometryHint::mapToGlobal(hwnd, client),
+                                             keyStateToMouseButtons((int)msg.wParam));
+    return true;
+}
+
+bool QWindowsMouseHandler::translateMouseWheelEvent(QWindow *window, HWND,
+                                                    MSG msg, LRESULT *)
+{
+    const Qt::MouseButtons buttons = keyStateToMouseButtons((int)msg.wParam);
+    int delta;
+    if (msg.message == WM_MOUSEWHEEL || msg.message == WM_MOUSEHWHEEL)
+        delta = (short) HIWORD (msg.wParam);
+    else
+        delta = (int) msg.wParam;
+
+    Qt::Orientation orientation = (msg.message == WM_MOUSEHWHEEL
+                                  || (buttons & Qt::AltModifier)) ?
+                                  Qt::Horizontal : Qt::Vertical;
+
+    // according to the MSDN documentation on WM_MOUSEHWHEEL:
+    // a positive value indicates that the wheel was rotated to the right;
+    // a negative value indicates that the wheel was rotated to the left.
+    // Qt defines this value as the exact opposite, so we have to flip the value!
+    if (msg.message == WM_MOUSEHWHEEL)
+        delta = -delta;
+
+    const QPoint globalPos(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
+    // TODO: if there is a widget under the mouse and it is not shadowed
+    // QWindow *receiver = windowAt(pos);
+    // by modality, we send the event to it first.
+    //synaptics touchpad shows its own widget at this position
+    //so widgetAt() will fail with that HWND, try child of this widget
+    // if (!receiver) receiver = window->childAt(pos);
+    QWindow *receiver = window;
+    QWindowSystemInterface::handleWheelEvent(receiver,
+                                             QWindowsGeometryHint::mapFromGlobal(receiver, globalPos),
+                                             globalPos,
+                                             delta, orientation);
+    return true;
+}
+
+// from bool QApplicationPrivate::translateTouchEvent()
+bool QWindowsMouseHandler::translateTouchEvent(QWindow *window, HWND,
+                                               QtWindows::WindowsEventType,
+                                               MSG msg, LRESULT *)
+{
+    typedef QWindowSystemInterface::TouchPoint QTouchPoint;
+    typedef QList<QWindowSystemInterface::TouchPoint> QTouchPointList;
+
+    const QRect screenGeometry = window->screen()->geometry();
+
+    const int winTouchPointCount = msg.wParam;
+    QScopedArrayPointer<TOUCHINPUT> winTouchInputs(new TOUCHINPUT[winTouchPointCount]);
+    memset(winTouchInputs.data(), 0, sizeof(TOUCHINPUT) * winTouchPointCount);
+
+    QTouchPointList touchPoints;
+    touchPoints.reserve(winTouchPointCount);
+    Qt::TouchPointStates allStates = 0;
+
+    Q_ASSERT(QWindowsContext::user32dll.getTouchInputInfo);
+
+    QWindowsContext::user32dll.getTouchInputInfo((HANDLE) msg.lParam, msg.wParam, winTouchInputs.data(), sizeof(TOUCHINPUT));
+    for (int i = 0; i < winTouchPointCount; ++i) {
+        const TOUCHINPUT &winTouchInput = winTouchInputs[i];
+        QTouchPoint touchPoint;
+        touchPoint.pressure = 1.0;
+        touchPoint.isPrimary = (winTouchInput.dwFlags & TOUCHEVENTF_PRIMARY) != 0;
+        touchPoint.id = m_touchInputIDToTouchPointID.value(winTouchInput.dwID, -1);
+        if (touchPoint.id == -1) {
+            touchPoint.id = m_touchInputIDToTouchPointID.size();
+            m_touchInputIDToTouchPointID.insert(winTouchInput.dwID, touchPoint.id);
+        }
+
+        QPointF screenPos = QPointF(qreal(winTouchInput.x) / qreal(100.), qreal(winTouchInput.y) / qreal(100.));
+        if (winTouchInput.dwMask & TOUCHINPUTMASKF_CONTACTAREA)
+            touchPoint.area.setSize(QSizeF(qreal(winTouchInput.cxContact) / qreal(100.),
+                                           qreal(winTouchInput.cyContact) / qreal(100.)));
+        touchPoint.area.moveCenter(screenPos);
+
+        if (winTouchInput.dwFlags & TOUCHEVENTF_DOWN) {
+            touchPoint.state = Qt::TouchPointPressed;
+        } else if (winTouchInput.dwFlags & TOUCHEVENTF_UP) {
+            touchPoint.state = Qt::TouchPointReleased;
+        } else {
+            // TODO: Previous code checked"
+            // screenPos == touchPoint.normalPosition -> Qt::TouchPointStationary, but
+            // but touchPoint.normalPosition was never initialized?
+            touchPoint.state = touchPoint.state;
+        }
+
+        touchPoint.normalPosition = QPointF(screenPos.x() / screenGeometry.width(),
+                                 screenPos.y() / screenGeometry.height());
+
+        allStates |= touchPoint.state;
+
+        touchPoints.append(touchPoint);
+    }
+
+    QWindowsContext::user32dll.closeTouchInputHandle((HANDLE) msg.lParam);
+
+    // all touch points released, forget the ids we've seen, they may not be reused
+    if ((allStates & Qt::TouchPointStateMask) == Qt::TouchPointReleased)
+        m_touchInputIDToTouchPointID.clear();
+
+    // TODO: Device used to be hardcoded to screen in previous code.
+    // What is the correct event type? Which parts of translateRawTouchEvent() are required?
+    QWindowSystemInterface::handleTouchEvent(window, QEvent::TouchBegin,
+                                             QTouchEvent::TouchScreen,
+                                             touchPoints);
+    return true;
+}
+
+QT_END_NAMESPACE