Long live Qt 4.5!

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diff --git a/tools/designer/src/lib/shared/qdesigner_dnditem.cpp b/tools/designer/src/lib/shared/qdesigner_dnditem.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the Qt Designer 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 "qdesigner_dnditem_p.h"
+#include "formwindowbase_p.h"
+#include "ui4_p.h"
+
+#include <QtGui/QPainter>
+#include <QtGui/QBitmap>
+#include <QtGui/QPixmap>
+#include <QtGui/QImage>
+#include <QtGui/QLabel>
+#include <QtGui/QDrag>
+#include <QtGui/QCursor>
+#include <QtGui/QDropEvent>
+#include <QtGui/QRgb>
+
+#include <QtCore/QMultiMap>
+
+QT_BEGIN_NAMESPACE
+
+namespace qdesigner_internal {
+
+QDesignerDnDItem::QDesignerDnDItem(DropType type, QWidget *source) :
+    m_source(source),
+    m_type(type),
+    m_dom_ui(0),
+    m_widget(0),
+    m_decoration(0)
+{
+}
+
+void QDesignerDnDItem::init(DomUI *ui, QWidget *widget, QWidget *decoration,
+                                    const QPoint &global_mouse_pos)
+{
+    Q_ASSERT(widget != 0 || ui != 0);
+    Q_ASSERT(decoration != 0);
+
+    m_dom_ui = ui;
+    m_widget = widget;
+    m_decoration = decoration;
+
+    const QRect geometry = m_decoration->geometry();
+    m_hot_spot = global_mouse_pos - m_decoration->geometry().topLeft();
+}
+
+QDesignerDnDItem::~QDesignerDnDItem()
+{
+    if (m_decoration != 0)
+        m_decoration->deleteLater();
+    delete m_dom_ui;
+}
+
+DomUI *QDesignerDnDItem::domUi() const
+{
+    return m_dom_ui;
+}
+
+QWidget *QDesignerDnDItem::decoration() const
+{
+    return m_decoration;
+}
+
+QPoint QDesignerDnDItem::hotSpot() const
+{
+    return m_hot_spot;
+}
+
+QWidget *QDesignerDnDItem::widget() const
+{
+    return m_widget;
+}
+
+QDesignerDnDItem::DropType QDesignerDnDItem::type() const
+{
+    return m_type;
+}
+
+QWidget *QDesignerDnDItem::source() const
+{
+    return m_source;
+}
+
+void QDesignerDnDItem::setDomUi(DomUI *dom_ui)
+{
+    delete m_dom_ui;
+    m_dom_ui = dom_ui;
+}
+
+// ---------- QDesignerMimeData
+
+// Make pixmap transparent on Windows only. Mac is transparent by default, Unix usually does not work.
+#ifdef Q_WS_WIN
+#  define TRANSPARENT_DRAG_PIXMAP
+#endif
+
+QDesignerMimeData::QDesignerMimeData(const QDesignerDnDItems &items, QDrag *drag) :
+    m_items(items)
+{
+    enum { Alpha = 200 };
+    QPoint decorationTopLeft;
+    switch (m_items.size()) {
+    case 0:
+        break;
+    case 1: {
+        QWidget *deco = m_items.first()->decoration();
+        decorationTopLeft = deco->pos();
+        const QPixmap widgetPixmap = QPixmap::grabWidget(deco);
+#ifdef TRANSPARENT_DRAG_PIXMAP
+        QImage image(widgetPixmap.size(), QImage::Format_ARGB32);
+        image.fill(QColor(Qt::transparent).rgba());
+        QPainter painter(&image);
+        painter.drawPixmap(QPoint(0, 0), widgetPixmap);
+        painter.end();
+        setImageTransparency(image, Alpha);
+        drag->setPixmap(QPixmap::fromImage(image));
+#else
+        drag->setPixmap(widgetPixmap);
+#endif
+    }
+        break;
+    default: {
+        // determine size of drag decoration by uniting all geometries
+        const QDesignerDnDItems::const_iterator cend = m_items.constEnd();
+        QDesignerDnDItems::const_iterator it =m_items.constBegin();
+        QRect unitedGeometry = (*it)->decoration()->geometry();
+        for (++it; it != cend; ++it )
+            unitedGeometry  = unitedGeometry .united((*it)->decoration()->geometry());
+
+        // paint with offset. At the same time, create a mask bitmap, containing widget rectangles.
+        QImage image(unitedGeometry.size(), QImage::Format_ARGB32);
+        image.fill(QColor(Qt::transparent).rgba());
+        QBitmap mask(unitedGeometry.size());
+        mask.clear();
+        // paint with offset, determine action
+        QPainter painter(&image);
+        QPainter maskPainter(&mask);
+        decorationTopLeft = unitedGeometry.topLeft();
+        for (it = m_items.constBegin() ; it != cend; ++it ) {
+            QWidget *w = (*it)->decoration();
+            const QPixmap wp = QPixmap::grabWidget(w);
+            const QPoint pos = w->pos() - decorationTopLeft;
+            painter.drawPixmap(pos, wp);
+            maskPainter.fillRect(QRect(pos, wp.size()), Qt::color1);
+        }
+        painter.end();
+        maskPainter.end();
+#ifdef TRANSPARENT_DRAG_PIXMAP
+        setImageTransparency(image, Alpha);
+#endif
+        QPixmap pixmap = QPixmap::fromImage(image);
+        pixmap.setMask(mask);
+        drag->setPixmap(pixmap);
+    }
+        break;
+    }
+    // determine hot spot and reconstruct the exact starting position as form window
+    // introduces some offset when detecting DnD
+    m_globalStartPos =  m_items.first()->decoration()->pos() +  m_items.first()->hotSpot();
+    m_hotSpot = m_globalStartPos - decorationTopLeft;
+    drag->setHotSpot(m_hotSpot);
+
+    drag->setMimeData(this);
+}
+
+QDesignerMimeData::~QDesignerMimeData()
+{
+    const QDesignerDnDItems::const_iterator cend = m_items.constEnd();
+    for (QDesignerDnDItems::const_iterator it = m_items.constBegin(); it != cend; ++it )
+        delete *it;
+}
+
+Qt::DropAction QDesignerMimeData::proposedDropAction() const
+{
+   return m_items.first()->type() == QDesignerDnDItemInterface::CopyDrop ? Qt::CopyAction : Qt::MoveAction;
+}
+
+Qt::DropAction QDesignerMimeData::execDrag(const QDesignerDnDItems &items, QWidget * dragSource)
+{
+    if (items.empty())
+        return Qt::IgnoreAction;
+
+    QDrag *drag = new QDrag(dragSource);
+    QDesignerMimeData *mimeData = new QDesignerMimeData(items, drag);
+
+    // Store pointers to widgets that are to be re-shown if a move operation is canceled
+    QWidgetList reshowWidgets;
+    const QDesignerDnDItems::const_iterator cend = items.constEnd();
+    for (QDesignerDnDItems::const_iterator it = items.constBegin(); it != cend; ++it )
+        if (QWidget *w = (*it)->widget())
+            if ((*it)->type() ==  QDesignerDnDItemInterface::MoveDrop)
+                reshowWidgets.push_back(w);
+
+    const Qt::DropAction executedAction = drag->exec(Qt::CopyAction|Qt::MoveAction, mimeData->proposedDropAction());
+
+    if (executedAction == Qt::IgnoreAction && !reshowWidgets.empty())
+        foreach (QWidget *w, reshowWidgets)
+            w->show();
+
+    return executedAction;
+}
+
+
+void QDesignerMimeData::moveDecoration(const QPoint &globalPos) const
+{
+    const QPoint relativeDistance = globalPos - m_globalStartPos;
+    const QDesignerDnDItems::const_iterator cend = m_items.constEnd();
+    for (QDesignerDnDItems::const_iterator it =m_items.constBegin(); it != cend; ++it ) {
+        QWidget *w = (*it)->decoration();
+        w->move(w->pos() + relativeDistance);
+    }
+}
+
+void QDesignerMimeData::removeMovedWidgetsFromSourceForm(const QDesignerDnDItems &items)
+{
+    typedef QMultiMap<FormWindowBase *, QWidget *> FormWidgetMap;
+    FormWidgetMap formWidgetMap;
+    // Find moved widgets per form
+    const QDesignerDnDItems::const_iterator cend = items.constEnd();
+    for (QDesignerDnDItems::const_iterator it = items.constBegin(); it != cend; ++it )
+        if ((*it)->type() ==  QDesignerDnDItemInterface::MoveDrop)
+            if (QWidget *w = (*it)->widget())
+                if (FormWindowBase *fb = qobject_cast<FormWindowBase *>((*it)->source()))
+                    formWidgetMap.insert(fb, w);
+    if (formWidgetMap.empty())
+        return;
+
+    foreach (FormWindowBase * fb, formWidgetMap.keys())
+        fb->deleteWidgetList(formWidgetMap.values(fb));
+}
+
+void QDesignerMimeData::acceptEventWithAction(Qt::DropAction desiredAction, QDropEvent *e)
+{
+    if (e->proposedAction() == desiredAction) {
+        e->acceptProposedAction();
+    } else {
+        e->setDropAction(desiredAction);
+        e->accept();
+    }
+}
+
+void QDesignerMimeData::acceptEvent(QDropEvent *e) const
+{
+    acceptEventWithAction(proposedDropAction(), e);
+}
+
+void QDesignerMimeData::setImageTransparency(QImage &image, int alpha)
+{
+    const int height = image.height();
+    for (int l = 0; l < height; l++) {
+        QRgb *line = reinterpret_cast<QRgb *>(image.scanLine(l));
+        QRgb *lineEnd = line + image.width();
+        for ( ; line < lineEnd; line++) {
+            const QRgb rgba = *line;
+            *line = qRgba(qRed(rgba), qGreen(rgba), qBlue(rgba), alpha);
+        }
+    }
+}
+
+} // namespace qdesigner_internal
+
+QT_END_NAMESPACE