1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the Qt Designer of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

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    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

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    36 **

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    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include "qdesigner_dnditem_p.h"

    43 #include "formwindowbase_p.h"

    44 #include "ui4_p.h"

    45 

    46 #include <QtGui/QPainter>

    47 #include <QtGui/QBitmap>

    48 #include <QtGui/QPixmap>

    49 #include <QtGui/QImage>

    50 #include <QtGui/QLabel>

    51 #include <QtGui/QDrag>

    52 #include <QtGui/QCursor>

    53 #include <QtGui/QDropEvent>

    54 #include <QtGui/QRgb>

    55 

    56 #include <QtCore/QMultiMap>

    57 

    58 QT_BEGIN_NAMESPACE

    59 

    60 namespace qdesigner_internal {

    61 

    62 QDesignerDnDItem::QDesignerDnDItem(DropType type, QWidget *source) :

    63     m_source(source),

    64     m_type(type),

    65     m_dom_ui(0),

    66     m_widget(0),

    67     m_decoration(0)

    68 {

    69 }

    70 

    71 void QDesignerDnDItem::init(DomUI *ui, QWidget *widget, QWidget *decoration,

    72                                     const QPoint &global_mouse_pos)

    73 {

    74     Q_ASSERT(widget != 0 || ui != 0);

    75     Q_ASSERT(decoration != 0);

    76 

    77     m_dom_ui = ui;

    78     m_widget = widget;

    79     m_decoration = decoration;

    80 

    81     const QRect geometry = m_decoration->geometry();

    82     m_hot_spot = global_mouse_pos - m_decoration->geometry().topLeft();

    83 }

    84 

    85 QDesignerDnDItem::~QDesignerDnDItem()

    86 {

    87     if (m_decoration != 0)

    88         m_decoration->deleteLater();

    89     delete m_dom_ui;

    90 }

    91 

    92 DomUI *QDesignerDnDItem::domUi() const

    93 {

    94     return m_dom_ui;

    95 }

    96 

    97 QWidget *QDesignerDnDItem::decoration() const

    98 {

    99     return m_decoration;

   100 }

   101 

   102 QPoint QDesignerDnDItem::hotSpot() const

   103 {

   104     return m_hot_spot;

   105 }

   106 

   107 QWidget *QDesignerDnDItem::widget() const

   108 {

   109     return m_widget;

   110 }

   111 

   112 QDesignerDnDItem::DropType QDesignerDnDItem::type() const

   113 {

   114     return m_type;

   115 }

   116 

   117 QWidget *QDesignerDnDItem::source() const

   118 {

   119     return m_source;

   120 }

   121 

   122 void QDesignerDnDItem::setDomUi(DomUI *dom_ui)

   123 {

   124     delete m_dom_ui;

   125     m_dom_ui = dom_ui;

   126 }

   127 

   128 // ---------- QDesignerMimeData

   129 

   130 // Make pixmap transparent on Windows only. Mac is transparent by default, Unix usually does not work.

   131 #ifdef Q_WS_WIN

   132 #  define TRANSPARENT_DRAG_PIXMAP

   133 #endif

   134 

   135 QDesignerMimeData::QDesignerMimeData(const QDesignerDnDItems &items, QDrag *drag) :

   136     m_items(items)

   137 {

   138     enum { Alpha = 200 };

   139     QPoint decorationTopLeft;

   140     switch (m_items.size()) {

   141     case 0:

   142         break;

   143     case 1: {

   144         QWidget *deco = m_items.first()->decoration();

   145         decorationTopLeft = deco->pos();

   146         const QPixmap widgetPixmap = QPixmap::grabWidget(deco);

   147 #ifdef TRANSPARENT_DRAG_PIXMAP

   148         QImage image(widgetPixmap.size(), QImage::Format_ARGB32);

   149         image.fill(QColor(Qt::transparent).rgba());

   150         QPainter painter(&image);

   151         painter.drawPixmap(QPoint(0, 0), widgetPixmap);

   152         painter.end();

   153         setImageTransparency(image, Alpha);

   154         drag->setPixmap(QPixmap::fromImage(image));

   155 #else

   156         drag->setPixmap(widgetPixmap);

   157 #endif

   158     }

   159         break;

   160     default: {

   161         // determine size of drag decoration by uniting all geometries

   162         const QDesignerDnDItems::const_iterator cend = m_items.constEnd();

   163         QDesignerDnDItems::const_iterator it =m_items.constBegin();

   164         QRect unitedGeometry = (*it)->decoration()->geometry();

   165         for (++it; it != cend; ++it )

   166             unitedGeometry  = unitedGeometry .united((*it)->decoration()->geometry());

   167 

   168         // paint with offset. At the same time, create a mask bitmap, containing widget rectangles.

   169         QImage image(unitedGeometry.size(), QImage::Format_ARGB32);

   170         image.fill(QColor(Qt::transparent).rgba());

   171         QBitmap mask(unitedGeometry.size());

   172         mask.clear();

   173         // paint with offset, determine action

   174         QPainter painter(&image);

   175         QPainter maskPainter(&mask);

   176         decorationTopLeft = unitedGeometry.topLeft();

   177         for (it = m_items.constBegin() ; it != cend; ++it ) {

   178             QWidget *w = (*it)->decoration();

   179             const QPixmap wp = QPixmap::grabWidget(w);

   180             const QPoint pos = w->pos() - decorationTopLeft;

   181             painter.drawPixmap(pos, wp);

   182             maskPainter.fillRect(QRect(pos, wp.size()), Qt::color1);

   183         }

   184         painter.end();

   185         maskPainter.end();

   186 #ifdef TRANSPARENT_DRAG_PIXMAP

   187         setImageTransparency(image, Alpha);

   188 #endif

   189         QPixmap pixmap = QPixmap::fromImage(image);

   190         pixmap.setMask(mask);

   191         drag->setPixmap(pixmap);

   192     }

   193         break;

   194     }

   195     // determine hot spot and reconstruct the exact starting position as form window

   196     // introduces some offset when detecting DnD

   197     m_globalStartPos =  m_items.first()->decoration()->pos() +  m_items.first()->hotSpot();

   198     m_hotSpot = m_globalStartPos - decorationTopLeft;

   199     drag->setHotSpot(m_hotSpot);

   200 

   201     drag->setMimeData(this);

   202 }

   203 

   204 QDesignerMimeData::~QDesignerMimeData()

   205 {

   206     const QDesignerDnDItems::const_iterator cend = m_items.constEnd();

   207     for (QDesignerDnDItems::const_iterator it = m_items.constBegin(); it != cend; ++it )

   208         delete *it;

   209 }

   210 

   211 Qt::DropAction QDesignerMimeData::proposedDropAction() const

   212 {

   213    return m_items.first()->type() == QDesignerDnDItemInterface::CopyDrop ? Qt::CopyAction : Qt::MoveAction;

   214 }

   215 

   216 Qt::DropAction QDesignerMimeData::execDrag(const QDesignerDnDItems &items, QWidget * dragSource)

   217 {

   218     if (items.empty())

   219         return Qt::IgnoreAction;

   220 

   221     QDrag *drag = new QDrag(dragSource);

   222     QDesignerMimeData *mimeData = new QDesignerMimeData(items, drag);

   223 

   224     // Store pointers to widgets that are to be re-shown if a move operation is canceled

   225     QWidgetList reshowWidgets;

   226     const QDesignerDnDItems::const_iterator cend = items.constEnd();

   227     for (QDesignerDnDItems::const_iterator it = items.constBegin(); it != cend; ++it )

   228         if (QWidget *w = (*it)->widget())

   229             if ((*it)->type() ==  QDesignerDnDItemInterface::MoveDrop)

   230                 reshowWidgets.push_back(w);

   231 

   232     const Qt::DropAction executedAction = drag->exec(Qt::CopyAction|Qt::MoveAction, mimeData->proposedDropAction());

   233 

   234     if (executedAction == Qt::IgnoreAction && !reshowWidgets.empty())

   235         foreach (QWidget *w, reshowWidgets)

   236             w->show();

   237 

   238     return executedAction;

   239 }

   240 

   241 

   242 void QDesignerMimeData::moveDecoration(const QPoint &globalPos) const

   243 {

   244     const QPoint relativeDistance = globalPos - m_globalStartPos;

   245     const QDesignerDnDItems::const_iterator cend = m_items.constEnd();

   246     for (QDesignerDnDItems::const_iterator it =m_items.constBegin(); it != cend; ++it ) {

   247         QWidget *w = (*it)->decoration();

   248         w->move(w->pos() + relativeDistance);

   249     }

   250 }

   251 

   252 void QDesignerMimeData::removeMovedWidgetsFromSourceForm(const QDesignerDnDItems &items)

   253 {

   254     typedef QMultiMap<FormWindowBase *, QWidget *> FormWidgetMap;

   255     FormWidgetMap formWidgetMap;

   256     // Find moved widgets per form

   257     const QDesignerDnDItems::const_iterator cend = items.constEnd();

   258     for (QDesignerDnDItems::const_iterator it = items.constBegin(); it != cend; ++it )

   259         if ((*it)->type() ==  QDesignerDnDItemInterface::MoveDrop)

   260             if (QWidget *w = (*it)->widget())

   261                 if (FormWindowBase *fb = qobject_cast<FormWindowBase *>((*it)->source()))

   262                     formWidgetMap.insert(fb, w);

   263     if (formWidgetMap.empty())

   264         return;

   265 

   266     foreach (FormWindowBase * fb, formWidgetMap.keys())

   267         fb->deleteWidgetList(formWidgetMap.values(fb));

   268 }

   269 

   270 void QDesignerMimeData::acceptEventWithAction(Qt::DropAction desiredAction, QDropEvent *e)

   271 {

   272     if (e->proposedAction() == desiredAction) {

   273         e->acceptProposedAction();

   274     } else {

   275         e->setDropAction(desiredAction);

   276         e->accept();

   277     }

   278 }

   279 

   280 void QDesignerMimeData::acceptEvent(QDropEvent *e) const

   281 {

   282     acceptEventWithAction(proposedDropAction(), e);

   283 }

   284 

   285 void QDesignerMimeData::setImageTransparency(QImage &image, int alpha)

   286 {

   287     const int height = image.height();

   288     for (int l = 0; l < height; l++) {

   289         QRgb *line = reinterpret_cast<QRgb *>(image.scanLine(l));

   290         QRgb *lineEnd = line + image.width();

   291         for ( ; line < lineEnd; line++) {

   292             const QRgb rgba = *line;

   293             *line = qRgba(qRed(rgba), qGreen(rgba), qBlue(rgba), alpha);

   294         }

   295     }

   296 }

   297 

   298 } // namespace qdesigner_internal

   299 

   300 QT_END_NAMESPACE