move drag handling back to Gui

Move the DnD related classes back into
QtGui. Parts of the implementation is currently
commented out and needs to be moved to
QWidgetWindow.

SC incompatible change:
APIs taking QWidget * now take QObject *

1 files changed, 490 insertions, 0 deletions

diff --git a/src/gui/kernel/qdnd.cpp b/src/gui/kernel/qdnd.cpp
new file mode 100644
index 0000000000..55fc3b09fc
--- /dev/null
+++ b/src/gui/kernel/qdnd.cpp
@@ -0,0 +1,490 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qplatformdefs.h"
+
+#include "qbitmap.h"
+#include "qdrag.h"
+#include "qpixmap.h"
+#include "qevent.h"
+#include "qfile.h"
+#include "qtextcodec.h"
+#include "qguiapplication.h"
+#include "qpoint.h"
+#include "qbuffer.h"
+#include "qimage.h"
+#include "qregexp.h"
+#include "qdir.h"
+#include "qdnd_p.h"
+#include "qimagereader.h"
+#include "qimagewriter.h"
+#include "qdebug.h"
+#include <ctype.h>
+
+#include <private/qguiapplication_p.h>
+
+#ifndef QT_NO_DRAGANDDROP
+
+QT_BEGIN_NAMESPACE
+
+#ifndef QT_NO_DRAGANDDROP
+
+//#define QDND_DEBUG
+
+#ifdef QDND_DEBUG
+QString dragActionsToString(Qt::DropActions actions)
+{
+    QString str;
+    if (actions == Qt::IgnoreAction) {
+        if (!str.isEmpty())
+            str += " | ";
+        str += "IgnoreAction";
+    }
+    if (actions & Qt::LinkAction) {
+        if (!str.isEmpty())
+            str += " | ";
+        str += "LinkAction";
+    }
+    if (actions & Qt::CopyAction) {
+        if (!str.isEmpty())
+            str += " | ";
+        str += "CopyAction";
+    }
+    if (actions & Qt::MoveAction) {
+        if (!str.isEmpty())
+            str += " | ";
+        str += "MoveAction";
+    }
+    if ((actions & Qt::TargetMoveAction) == Qt::TargetMoveAction ) {
+        if (!str.isEmpty())
+            str += " | ";
+        str += "TargetMoveAction";
+    }
+    return str;
+}
+
+QString KeyboardModifiersToString(Qt::KeyboardModifiers moderfies)
+{
+    QString str;
+    if (moderfies & Qt::ControlModifier) {
+        if (!str.isEmpty())
+            str += " | ";
+        str += Qt::ControlModifier;
+    }
+    if (moderfies & Qt::AltModifier) {
+        if (!str.isEmpty())
+            str += " | ";
+        str += Qt::AltModifier;
+    }
+    if (moderfies & Qt::ShiftModifier) {
+        if (!str.isEmpty())
+            str += " | ";
+        str += Qt::ShiftModifier;
+    }
+    return str;
+}
+#endif
+
+
+// the universe's only drag manager
+QDragManager *QDragManager::instance = 0;
+
+
+QDragManager::QDragManager()
+    : QObject(qApp)
+{
+    Q_ASSERT(!instance);
+
+#ifdef Q_WS_QWS
+    currentActionForOverrideCursor = Qt::IgnoreAction;
+#endif
+    object = 0;
+    beingCancelled = false;
+    restoreCursor = false;
+    willDrop = false;
+    eventLoop = 0;
+    dropData = new QDropData();
+    currentDropTarget = 0;
+#ifdef Q_WS_X11
+    xdndMimeTransferedPixmapIndex = 0;
+#endif
+}
+
+
+QDragManager::~QDragManager()
+{
+#ifndef QT_NO_CURSOR
+    if (restoreCursor)
+        QGuiApplication::restoreOverrideCursor();
+#endif
+    instance = 0;
+    delete dropData;
+}
+
+QDragManager *QDragManager::self()
+{
+    if (!instance && !QGuiApplication::closingDown())
+        instance = new QDragManager;
+    return instance;
+}
+
+QPixmap QDragManager::dragCursor(Qt::DropAction action) const
+{
+    QDragPrivate * d = dragPrivate();
+    if (d && d->customCursors.contains(action))
+        return d->customCursors[action];
+    else if (action == Qt::MoveAction)
+        return QGuiApplicationPrivate::instance()->getPixmapCursor(Qt::DragMoveCursor);
+    else if (action == Qt::CopyAction)
+        return QGuiApplicationPrivate::instance()->getPixmapCursor(Qt::DragCopyCursor);
+    else if (action == Qt::LinkAction)
+        return QGuiApplicationPrivate::instance()->getPixmapCursor(Qt::DragLinkCursor);
+#ifdef Q_WS_WIN
+    else if (action == Qt::IgnoreAction)
+        return QGuiApplicationPrivate::instance()->getPixmapCursor(Qt::ForbiddenCursor);
+#endif
+    return QPixmap();
+}
+
+bool QDragManager::hasCustomDragCursors() const
+{
+    QDragPrivate * d = dragPrivate();
+    return d && !d->customCursors.isEmpty();
+}
+
+Qt::DropAction QDragManager::defaultAction(Qt::DropActions possibleActions,
+                                           Qt::KeyboardModifiers modifiers) const
+{
+#ifdef QDND_DEBUG
+    qDebug("QDragManager::defaultAction(Qt::DropActions possibleActions)");
+    qDebug("keyboard modifiers : %s", KeyboardModifiersToString(modifiers).latin1());
+#endif
+
+    QDragPrivate *d = dragPrivate();
+    Qt::DropAction defaultAction = d ? d->defaultDropAction : Qt::IgnoreAction;
+
+    if (defaultAction == Qt::IgnoreAction) {
+        //This means that the drag was initiated by QDrag::start and we need to
+        //preserve the old behavior
+#ifdef Q_WS_MAC
+        defaultAction = Qt::MoveAction;
+#else
+        defaultAction = Qt::CopyAction;
+#endif
+    }
+
+#ifdef Q_WS_MAC
+    if (modifiers & Qt::ControlModifier && modifiers & Qt::AltModifier)
+        defaultAction = Qt::LinkAction;
+    else if (modifiers & Qt::AltModifier)
+        defaultAction = Qt::CopyAction;
+    else if (modifiers & Qt::ControlModifier)
+        defaultAction = Qt::MoveAction;
+#else
+    if (modifiers & Qt::ControlModifier && modifiers & Qt::ShiftModifier)
+        defaultAction = Qt::LinkAction;
+    else if (modifiers & Qt::ControlModifier)
+        defaultAction = Qt::CopyAction;
+    else if (modifiers & Qt::ShiftModifier)
+        defaultAction = Qt::MoveAction;
+    else if (modifiers & Qt::AltModifier)
+        defaultAction = Qt::LinkAction;
+#endif
+
+    // if the object is set take the list of possibles from it
+    if (object)
+        possibleActions = object->d_func()->possible_actions;
+
+#ifdef QDND_DEBUG
+    qDebug("possible actions : %s", dragActionsToString(possibleActions).latin1());
+#endif
+
+    // Check if the action determined is allowed
+    if (!(possibleActions & defaultAction)) {
+        if (possibleActions & Qt::CopyAction)
+            defaultAction = Qt::CopyAction;
+        else if (possibleActions & Qt::MoveAction)
+            defaultAction = Qt::MoveAction;
+        else if (possibleActions & Qt::LinkAction)
+            defaultAction = Qt::LinkAction;
+        else
+            defaultAction = Qt::IgnoreAction;
+    }
+
+#ifdef QDND_DEBUG
+    qDebug("default action : %s", dragActionsToString(defaultAction).latin1());
+#endif
+
+    return defaultAction;
+}
+
+void QDragManager::setCurrentTarget(QObject *target, bool dropped)
+{
+    if (currentDropTarget == target)
+        return;
+
+    currentDropTarget = target;
+    if (!dropped && object) {
+        object->d_func()->target = target;
+        emit object->targetChanged(target);
+    }
+
+}
+
+QObject *QDragManager::currentTarget()
+{
+    return currentDropTarget;
+}
+
+#endif
+
+QDropData::QDropData()
+    : QInternalMimeData()
+{
+}
+
+QDropData::~QDropData()
+{
+}
+#endif // QT_NO_DRAGANDDROP
+
+#if !(defined(QT_NO_DRAGANDDROP) && defined(QT_NO_CLIPBOARD))
+
+static QStringList imageReadMimeFormats()
+{
+    QStringList formats;
+    QList<QByteArray> imageFormats = QImageReader::supportedImageFormats();
+    for (int i = 0; i < imageFormats.size(); ++i) {
+        QString format = QLatin1String("image/");
+        format += QString::fromLatin1(imageFormats.at(i).toLower());
+        formats.append(format);
+    }
+
+    //put png at the front because it is best
+    int pngIndex = formats.indexOf(QLatin1String("image/png"));
+    if (pngIndex != -1 && pngIndex != 0)
+        formats.move(pngIndex, 0);
+
+    return formats;
+}
+
+
+static QStringList imageWriteMimeFormats()
+{
+    QStringList formats;
+    QList<QByteArray> imageFormats = QImageWriter::supportedImageFormats();
+    for (int i = 0; i < imageFormats.size(); ++i) {
+        QString format = QLatin1String("image/");
+        format += QString::fromLatin1(imageFormats.at(i).toLower());
+        formats.append(format);
+    }
+
+    //put png at the front because it is best
+    int pngIndex = formats.indexOf(QLatin1String("image/png"));
+    if (pngIndex != -1 && pngIndex != 0)
+        formats.move(pngIndex, 0);
+
+    return formats;
+}
+
+QInternalMimeData::QInternalMimeData()
+    : QMimeData()
+{
+}
+
+QInternalMimeData::~QInternalMimeData()
+{
+}
+
+bool QInternalMimeData::hasFormat(const QString &mimeType) const
+{
+    bool foundFormat = hasFormat_sys(mimeType);
+    if (!foundFormat && mimeType == QLatin1String("application/x-qt-image")) {
+        QStringList imageFormats = imageReadMimeFormats();
+        for (int i = 0; i < imageFormats.size(); ++i) {
+            if ((foundFormat = hasFormat_sys(imageFormats.at(i))))
+                break;
+        }
+    }
+    return foundFormat;
+}
+
+QStringList QInternalMimeData::formats() const
+{
+    QStringList realFormats = formats_sys();
+    if (!realFormats.contains(QLatin1String("application/x-qt-image"))) {
+        QStringList imageFormats = imageReadMimeFormats();
+        for (int i = 0; i < imageFormats.size(); ++i) {
+            if (realFormats.contains(imageFormats.at(i))) {
+                realFormats += QLatin1String("application/x-qt-image");
+                break;
+            }
+        }
+    }
+    return realFormats;
+}
+
+QVariant QInternalMimeData::retrieveData(const QString &mimeType, QVariant::Type type) const
+{
+    QVariant data = retrieveData_sys(mimeType, type);
+    if (mimeType == QLatin1String("application/x-qt-image")) {
+        if (data.isNull() || (data.type() == QVariant::ByteArray && data.toByteArray().isEmpty())) {
+            // try to find an image
+            QStringList imageFormats = imageReadMimeFormats();
+            for (int i = 0; i < imageFormats.size(); ++i) {
+                data = retrieveData_sys(imageFormats.at(i), type);
+                if (data.isNull() || (data.type() == QVariant::ByteArray && data.toByteArray().isEmpty()))
+                    continue;
+                break;
+            }
+        }
+        // we wanted some image type, but all we got was a byte array. Convert it to an image.
+        if (data.type() == QVariant::ByteArray
+            && (type == QVariant::Image || type == QVariant::Pixmap || type == QVariant::Bitmap))
+            data = QImage::fromData(data.toByteArray());
+
+    } else if (mimeType == QLatin1String("application/x-color") && data.type() == QVariant::ByteArray) {
+        QColor c;
+        QByteArray ba = data.toByteArray();
+        if (ba.size() == 8) {
+            ushort * colBuf = (ushort *)ba.data();
+            c.setRgbF(qreal(colBuf[0]) / qreal(0xFFFF),
+                      qreal(colBuf[1]) / qreal(0xFFFF),
+                      qreal(colBuf[2]) / qreal(0xFFFF),
+                      qreal(colBuf[3]) / qreal(0xFFFF));
+            data = c;
+        } else {
+            qWarning("Qt: Invalid color format");
+        }
+    } else if (data.type() != type && data.type() == QVariant::ByteArray) {
+        // try to use mime data's internal conversion stuf.
+        QInternalMimeData *that = const_cast<QInternalMimeData *>(this);
+        that->setData(mimeType, data.toByteArray());
+        data = QMimeData::retrieveData(mimeType, type);
+        that->clear();
+    }
+    return data;
+}
+
+bool QInternalMimeData::canReadData(const QString &mimeType)
+{
+    return imageReadMimeFormats().contains(mimeType);
+}
+
+// helper functions for rendering mimedata to the system, this is needed because QMimeData is in core.
+QStringList QInternalMimeData::formatsHelper(const QMimeData *data)
+{
+    QStringList realFormats = data->formats();
+    if (realFormats.contains(QLatin1String("application/x-qt-image"))) {
+        // add all supported image formats
+        QStringList imageFormats = imageWriteMimeFormats();
+        for (int i = 0; i < imageFormats.size(); ++i) {
+            if (!realFormats.contains(imageFormats.at(i)))
+                realFormats.append(imageFormats.at(i));
+        }
+    }
+    return realFormats;
+}
+
+bool QInternalMimeData::hasFormatHelper(const QString &mimeType, const QMimeData *data)
+{
+
+    bool foundFormat = data->hasFormat(mimeType);
+    if (!foundFormat) {
+        if (mimeType == QLatin1String("application/x-qt-image")) {
+            // check all supported image formats
+            QStringList imageFormats = imageWriteMimeFormats();
+            for (int i = 0; i < imageFormats.size(); ++i) {
+                if ((foundFormat = data->hasFormat(imageFormats.at(i))))
+                    break;
+            }
+        } else if (mimeType.startsWith(QLatin1String("image/"))) {
+            return data->hasImage() && imageWriteMimeFormats().contains(mimeType);
+        }
+    }
+    return foundFormat;
+}
+
+QByteArray QInternalMimeData::renderDataHelper(const QString &mimeType, const QMimeData *data)
+{
+    QByteArray ba;
+    if (mimeType == QLatin1String("application/x-color")) {
+        /* QMimeData can only provide colors as QColor or the name
+           of a color as a QByteArray or a QString. So we need to do
+           the conversion to application/x-color here.
+           The application/x-color format is :
+           type: application/x-color
+           format: 16
+           data[0]: red
+           data[1]: green
+           data[2]: blue
+           data[3]: opacity
+        */
+        ba.resize(8);
+        ushort * colBuf = (ushort *)ba.data();
+        QColor c = qvariant_cast<QColor>(data->colorData());
+        colBuf[0] = ushort(c.redF() * 0xFFFF);
+        colBuf[1] = ushort(c.greenF() * 0xFFFF);
+        colBuf[2] = ushort(c.blueF() * 0xFFFF);
+        colBuf[3] = ushort(c.alphaF() * 0xFFFF);
+    } else {
+        ba = data->data(mimeType);
+        if (ba.isEmpty()) {
+            if (mimeType == QLatin1String("application/x-qt-image") && data->hasImage()) {
+                QImage image = qvariant_cast<QImage>(data->imageData());
+                QBuffer buf(&ba);
+                buf.open(QBuffer::WriteOnly);
+                // would there not be PNG ??
+                image.save(&buf, "PNG");
+            } else if (mimeType.startsWith(QLatin1String("image/")) && data->hasImage()) {
+                QImage image = qvariant_cast<QImage>(data->imageData());
+                QBuffer buf(&ba);
+                buf.open(QBuffer::WriteOnly);
+                image.save(&buf, mimeType.mid(mimeType.indexOf(QLatin1Char('/')) + 1).toLatin1().toUpper());
+            }
+        }
+    }
+    return ba;
+}
+
+#endif // QT_NO_DRAGANDDROP && QT_NO_CLIPBOARD
+
+QT_END_NAMESPACE