Long live Qt!

1 files changed, 422 insertions, 0 deletions

diff --git a/src/gui/kernel/qdnd_qws.cpp b/src/gui/kernel/qdnd_qws.cpp
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index 0000000..98a60a1
--- /dev/null
+++ b/src/gui/kernel/qdnd_qws.cpp
@@ -0,0 +1,422 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qapplication.h"
+
+#ifndef QT_NO_DRAGANDDROP
+
+#include "qwidget.h"
+#include "qdatetime.h"
+#include "qbitmap.h"
+#include "qcursor.h"
+#include "qevent.h"
+#include "qpainter.h"
+#include "qdnd_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QT_USE_NAMESPACE
+
+static QPixmap *defaultPm = 0;
+static const int default_pm_hotx = -2;
+static const int default_pm_hoty = -16;
+static const char *const default_pm[] = {
+"13 9 3 1",
+".      c None",
+"       c #000000",
+"X      c #FFFFFF",
+"X X X X X X X",
+" X X X X X X ",
+"X ......... X",
+" X.........X ",
+"X ......... X",
+" X.........X ",
+"X ......... X",
+" X X X X X X ",
+"X X X X X X X",
+};
+
+// Shift/Ctrl handling, and final drop status
+static Qt::DropAction global_accepted_action = Qt::CopyAction;
+static Qt::DropActions possible_actions = Qt::IgnoreAction;
+
+
+// static variables in place of a proper cross-process solution
+static QDrag *drag_object;
+static bool qt_qws_dnd_dragging = false;
+
+
+static Qt::KeyboardModifiers oldstate;
+
+class QShapedPixmapWidget : public QWidget {
+    QPixmap pixmap;
+public:
+    QShapedPixmapWidget() :
+        QWidget(0, Qt::Tool | Qt::FramelessWindowHint | Qt::X11BypassWindowManagerHint)
+    {
+        // ### Temporary workaround for 4.2-rc1!!! To prevent flickering when
+        // using drag'n drop in a client application. (task 126956)
+        // setAttribute() should be done unconditionally!
+        if (QApplication::type() == QApplication::GuiServer)
+            setAttribute(Qt::WA_TransparentForMouseEvents);
+    }
+
+    void setPixmap(QPixmap pm)
+    {
+        pixmap = pm;
+        if (!pixmap.mask().isNull()) {
+            setMask(pixmap.mask());
+        } else {
+            clearMask();
+        }
+        resize(pm.width(),pm.height());
+    }
+
+    void paintEvent(QPaintEvent*)
+    {
+        QPainter p(this);
+        p.drawPixmap(0,0,pixmap);
+    }
+};
+
+
+static QShapedPixmapWidget *qt_qws_dnd_deco = 0;
+
+
+void QDragManager::updatePixmap()
+{
+    if (qt_qws_dnd_deco) {
+        QPixmap pm;
+        QPoint pm_hot(default_pm_hotx,default_pm_hoty);
+        if (drag_object) {
+            pm = drag_object->pixmap();
+            if (!pm.isNull())
+                pm_hot = drag_object->hotSpot();
+        }
+        if (pm.isNull()) {
+            if (!defaultPm)
+                defaultPm = new QPixmap(default_pm);
+            pm = *defaultPm;
+        }
+        qt_qws_dnd_deco->setPixmap(pm);
+        qt_qws_dnd_deco->move(QCursor::pos()-pm_hot);
+        if (willDrop) {
+            qt_qws_dnd_deco->show();
+        } else {
+            qt_qws_dnd_deco->hide();
+        }
+    }
+}
+
+void QDragManager::timerEvent(QTimerEvent *) { }
+
+void QDragManager::move(const QPoint &) { }
+
+void QDragManager::updateCursor()
+{
+#ifndef QT_NO_CURSOR
+    if (willDrop) {
+        if (qt_qws_dnd_deco)
+            qt_qws_dnd_deco->show();
+        if (currentActionForOverrideCursor != global_accepted_action) {
+            QApplication::changeOverrideCursor(QCursor(dragCursor(global_accepted_action), 0, 0));
+            currentActionForOverrideCursor = global_accepted_action;
+        }
+    } else {
+        QCursor *overrideCursor = QApplication::overrideCursor();
+        if (!overrideCursor || overrideCursor->shape() != Qt::ForbiddenCursor) {
+            QApplication::changeOverrideCursor(QCursor(Qt::ForbiddenCursor));
+            currentActionForOverrideCursor = Qt::IgnoreAction;
+        }
+        if (qt_qws_dnd_deco)
+            qt_qws_dnd_deco->hide();
+    }
+#endif
+}
+
+
+bool QDragManager::eventFilter(QObject *o, QEvent *e)
+{
+ if (beingCancelled) {
+     if (e->type() == QEvent::KeyRelease && static_cast<QKeyEvent*>(e)->key() == Qt::Key_Escape) {
+            qApp->removeEventFilter(this);
+            Q_ASSERT(object == 0);
+            beingCancelled = false;
+            eventLoop->exit();
+            return true; // block the key release
+        }
+        return false;
+    }
+
+
+
+    if (!o->isWidgetType())
+        return false;
+
+    switch(e->type()) {
+
+        case QEvent::KeyPress:
+        case QEvent::KeyRelease:
+        {
+            QKeyEvent *ke = ((QKeyEvent*)e);
+            if (ke->key() == Qt::Key_Escape && e->type() == QEvent::KeyPress) {
+                cancel();
+                qApp->removeEventFilter(this);
+                beingCancelled = false;
+                eventLoop->exit();
+            } else {
+                updateCursor();
+            }
+            return true; // Eat all key events
+        }
+
+        case QEvent::MouseButtonPress:
+        case QEvent::MouseMove:
+        {
+            if (!object) { //#### this should not happen
+                qWarning("QDragManager::eventFilter: No object");
+                return true;
+            }
+
+            QDragManager *manager = QDragManager::self();
+            QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;
+            if (manager->object)
+                possible_actions =  manager->dragPrivate()->possible_actions;
+            else
+                possible_actions = Qt::IgnoreAction;
+
+            QMouseEvent *me = (QMouseEvent *)e;
+            if (me->buttons()) {
+                Qt::DropAction prevAction = global_accepted_action;
+                QWidget *cw = QApplication::widgetAt(me->globalPos());
+
+                // Fix for when we move mouse on to the deco widget
+                if (qt_qws_dnd_deco && cw == qt_qws_dnd_deco)
+                    cw = object->target();
+
+                while (cw && !cw->acceptDrops() && !cw->isWindow())
+                    cw = cw->parentWidget();
+
+                if (object->target() != cw) {
+                    if (object->target()) {
+                        QDragLeaveEvent dle;
+                        QApplication::sendEvent(object->target(), &dle);
+                        willDrop = false;
+                        global_accepted_action = Qt::IgnoreAction;
+                        updateCursor();
+                        restoreCursor = true;
+                        object->d_func()->target = 0;
+                    }
+                    if (cw && cw->acceptDrops()) {
+                        object->d_func()->target = cw;
+                        QDragEnterEvent dee(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,
+                                            me->buttons(), me->modifiers());
+                        QApplication::sendEvent(object->target(), &dee);
+                        willDrop = dee.isAccepted() && dee.dropAction() != Qt::IgnoreAction;
+                        global_accepted_action = willDrop ? dee.dropAction() : Qt::IgnoreAction;
+                        updateCursor();
+                        restoreCursor = true;
+                    }
+                } else if (cw) {
+                    QDragMoveEvent dme(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,
+                                       me->buttons(), me->modifiers());
+                    if (global_accepted_action != Qt::IgnoreAction) {
+                        dme.setDropAction(global_accepted_action);
+                        dme.accept();
+                    }
+                    QApplication::sendEvent(cw, &dme);
+                    willDrop = dme.isAccepted();
+                    global_accepted_action = willDrop ? dme.dropAction() : Qt::IgnoreAction;
+                    updatePixmap();
+                    updateCursor();
+                }
+                if (global_accepted_action != prevAction)
+                    emitActionChanged(global_accepted_action);
+            }
+            return true; // Eat all mouse events
+        }
+
+        case QEvent::MouseButtonRelease:
+        {
+            qApp->removeEventFilter(this);
+            if (restoreCursor) {
+                willDrop = false;
+#ifndef QT_NO_CURSOR
+                QApplication::restoreOverrideCursor();
+#endif
+                restoreCursor = false;
+            }
+            if (object && object->target()) {
+                QMouseEvent *me = (QMouseEvent *)e;
+
+                QDragManager *manager = QDragManager::self();
+                QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;
+
+                QDropEvent de(object->target()->mapFromGlobal(me->globalPos()), possible_actions, dropData,
+                              me->buttons(), me->modifiers());
+                QApplication::sendEvent(object->target(), &de);
+                if (de.isAccepted())
+                    global_accepted_action = de.dropAction();
+                else
+                    global_accepted_action = Qt::IgnoreAction;
+
+                if (object)
+                    object->deleteLater();
+                drag_object = object = 0;
+            }
+            eventLoop->exit();
+            return true; // Eat all mouse events
+        }
+
+        default:
+             break;
+    }
+
+    return false;
+}
+
+Qt::DropAction QDragManager::drag(QDrag *o)
+{
+    if (object == o || !o || !o->source())
+         return Qt::IgnoreAction;
+
+    if (object) {
+        cancel();
+        qApp->removeEventFilter(this);
+        beingCancelled = false;
+    }
+
+    object = drag_object = o;
+    qt_qws_dnd_deco = new QShapedPixmapWidget();
+    oldstate = Qt::NoModifier; // #### Should use state that caused the drag
+//    drag_mode = mode;
+
+    willDrop = false;
+    updatePixmap();
+    updateCursor();
+    restoreCursor = true;
+    object->d_func()->target = 0;
+    qApp->installEventFilter(this);
+
+    global_accepted_action = Qt::CopyAction;
+#ifndef QT_NO_CURSOR
+    qApp->setOverrideCursor(Qt::ArrowCursor);
+    restoreCursor = true;
+    updateCursor();
+#endif
+
+    qt_qws_dnd_dragging = true;
+
+    eventLoop = new QEventLoop;
+    (void) eventLoop->exec();
+    delete eventLoop;
+    eventLoop = 0;
+
+    delete qt_qws_dnd_deco;
+    qt_qws_dnd_deco = 0;
+    qt_qws_dnd_dragging = false;
+
+
+    return global_accepted_action;
+}
+
+
+void QDragManager::cancel(bool deleteSource)
+{
+//    qDebug("QDragManager::cancel");
+    beingCancelled = true;
+
+    if (object->target()) {
+        QDragLeaveEvent dle;
+        QApplication::sendEvent(object->target(), &dle);
+    }
+
+#ifndef QT_NO_CURSOR
+    if (restoreCursor) {
+        QApplication::restoreOverrideCursor();
+        restoreCursor = false;
+    }
+#endif
+
+    if (drag_object) {
+        if (deleteSource)
+            object->deleteLater();
+        drag_object = object = 0;
+    }
+
+    delete qt_qws_dnd_deco;
+    qt_qws_dnd_deco = 0;
+
+    global_accepted_action = Qt::IgnoreAction;
+}
+
+
+void QDragManager::drop()
+{
+}
+
+QVariant QDropData::retrieveData_sys(const QString &mimetype, QVariant::Type type) const
+{
+    if (!drag_object)
+        return QVariant();
+    QByteArray data =  drag_object->mimeData()->data(mimetype);
+    if (type == QVariant::String)
+        return QString::fromUtf8(data);
+    return data;
+}
+
+bool QDropData::hasFormat_sys(const QString &format) const
+{
+    return formats().contains(format);
+}
+
+QStringList QDropData::formats_sys() const
+{
+    if (drag_object)
+        return drag_object->mimeData()->formats();
+    return QStringList();
+}
+
+
+#endif // QT_NO_DRAGANDDROP
+
+
+QT_END_NAMESPACE