Long live Qt!

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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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of Qt Designer.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+
+#ifndef CONNECTIONEDIT_H
+#define CONNECTIONEDIT_H
+
+#include "shared_global_p.h"
+
+#include <QtCore/QMultiMap>
+#include <QtCore/QList>
+#include <QtCore/QPointer>
+
+#include <QtGui/QWidget>
+#include <QtGui/QPixmap>
+#include <QtGui/QPolygonF>
+
+#include <QtGui/QUndoCommand>
+
+QT_BEGIN_NAMESPACE
+
+class QDesignerFormWindowInterface;
+class QUndoStack;
+class QMenu;
+
+namespace qdesigner_internal {
+
+class Connection;
+class ConnectionEdit;
+
+class QDESIGNER_SHARED_EXPORT CETypes
+{
+public:
+    typedef QList<Connection*> ConnectionList;
+    typedef QMap<Connection*, Connection*> ConnectionSet;
+    typedef QMap<QWidget*, QWidget*> WidgetSet;
+
+    class EndPoint {
+    public:
+        enum Type { Source, Target };
+        EndPoint(Connection *_con = 0, Type _type = Source) : con(_con), type(_type) {}
+        bool isNull() const { return con == 0; }
+        bool operator == (const EndPoint &other) const { return con == other.con && type == other.type; }
+        bool operator != (const EndPoint &other) const { return !operator == (other); }
+        Connection *con;
+        Type type;
+    };
+    enum LineDir { UpDir = 0, DownDir, RightDir, LeftDir };
+};
+
+class QDESIGNER_SHARED_EXPORT Connection : public CETypes
+{
+public:
+    explicit Connection(ConnectionEdit *edit);
+    explicit Connection(ConnectionEdit *edit, QObject *source, QObject *target);
+    virtual ~Connection() {}
+
+    QObject *object(EndPoint::Type type) const
+    {
+        return (type == EndPoint::Source ? m_source : m_target);
+    }
+
+    QWidget *widget(EndPoint::Type type) const
+    {
+        return qobject_cast<QWidget*>(object(type));
+    }
+
+    QPoint endPointPos(EndPoint::Type type) const;
+    QRect endPointRect(EndPoint::Type) const;
+    void setEndPoint(EndPoint::Type type, QObject *w, const QPoint &pos)
+        { type == EndPoint::Source ? setSource(w, pos) : setTarget(w, pos); }
+
+    bool isVisible() const;
+    virtual void updateVisibility();
+    void setVisible(bool b);
+
+    virtual QRegion region() const;
+    bool contains(const QPoint &pos) const;
+    virtual void paint(QPainter *p) const;
+
+    void update(bool update_widgets = true) const;
+    void checkWidgets();
+
+    QString label(EndPoint::Type type) const
+        { return type == EndPoint::Source ? m_source_label : m_target_label; }
+    void setLabel(EndPoint::Type type, const QString &text);
+    QRect labelRect(EndPoint::Type type) const;
+    QPixmap labelPixmap(EndPoint::Type type) const
+        { return type == EndPoint::Source ? m_source_label_pm : m_target_label_pm; }
+
+    ConnectionEdit *edit() const { return m_edit; }
+
+    virtual void inserted() {}
+    virtual void removed() {}
+
+private:
+    QPoint m_source_pos, m_target_pos;
+    QObject *m_source, *m_target;
+    QList<QPoint> m_knee_list;
+    QPolygonF m_arrow_head;
+    ConnectionEdit *m_edit;
+    QString m_source_label, m_target_label;
+    QPixmap m_source_label_pm, m_target_label_pm;
+    QRect m_source_rect, m_target_rect;
+    bool m_visible;
+
+    void setSource(QObject *source, const QPoint &pos);
+    void setTarget(QObject *target, const QPoint &pos);
+    void updateKneeList();
+    void trimLine();
+    void updatePixmap(EndPoint::Type type);
+    LineDir labelDir(EndPoint::Type type) const;
+    bool ground() const;
+    QRect groundRect() const;
+};
+
+class QDESIGNER_SHARED_EXPORT ConnectionEdit : public QWidget, public CETypes
+{
+    Q_OBJECT
+public:
+    ConnectionEdit(QWidget *parent, QDesignerFormWindowInterface *form);
+    virtual ~ConnectionEdit();
+
+    inline const QPointer<QWidget> &background() const { return m_bg_widget; }
+
+    void setSelected(Connection *con, bool sel);
+    bool selected(const Connection *con) const;
+
+    int connectionCount() const { return m_con_list.size(); }
+    Connection *connection(int i) const { return m_con_list.at(i); }
+    int indexOfConnection(Connection *con) const { return m_con_list.indexOf(con); }
+
+    virtual void setSource(Connection *con, const QString &obj_name);
+    virtual void setTarget(Connection *con, const QString &obj_name);
+
+    QUndoStack *undoStack() const { return m_undo_stack; }
+
+    void clear();
+
+    void showEvent(QShowEvent * /*e*/)
+    {
+        updateBackground();
+    }
+
+signals:
+    void aboutToAddConnection(int idx);
+    void connectionAdded(Connection *con);
+    void aboutToRemoveConnection(Connection *con);
+    void connectionRemoved(int idx);
+    void connectionSelected(Connection *con);
+    void widgetActivated(QWidget *wgt);
+    void connectionChanged(Connection *con);
+
+public slots:
+    void selectNone();
+    void selectAll();
+    virtual void deleteSelected();
+    virtual void setBackground(QWidget *background);
+    virtual void updateBackground();
+    virtual void widgetRemoved(QWidget *w);
+    virtual void objectRemoved(QObject *o);
+
+    void updateLines();
+    void enableUpdateBackground(bool enable);
+
+protected:
+    virtual void paintEvent(QPaintEvent *e);
+    virtual void mouseMoveEvent(QMouseEvent *e);
+    virtual void mousePressEvent(QMouseEvent *e);
+    virtual void mouseReleaseEvent(QMouseEvent *e);
+    virtual void keyPressEvent(QKeyEvent *e);
+    virtual void mouseDoubleClickEvent(QMouseEvent *e);
+    virtual void resizeEvent(QResizeEvent *e);
+    virtual void contextMenuEvent(QContextMenuEvent * event);
+
+    virtual Connection *createConnection(QWidget *source, QWidget *target);
+    virtual void modifyConnection(Connection *con);
+
+    virtual QWidget *widgetAt(const QPoint &pos) const;
+    virtual void createContextMenu(QMenu &menu);
+    void addConnection(Connection *con);
+    QRect widgetRect(QWidget *w) const;
+
+    enum State { Editing, Connecting, Dragging };
+    State state() const;
+
+    virtual void endConnection(QWidget *target, const QPoint &pos);
+
+    const ConnectionList &connectionList() const { return m_con_list; }
+    const ConnectionSet &selection()  const      { return m_sel_con_set; }
+    Connection *takeConnection(Connection *con);
+    Connection *newlyAddedConnection()           { return m_tmp_con; }
+    void clearNewlyAddedConnection();
+
+    void findObjectsUnderMouse(const QPoint &pos);
+
+private:
+    void startConnection(QWidget *source, const QPoint &pos);
+    void continueConnection(QWidget *target, const QPoint &pos);
+    void abortConnection();
+
+    void startDrag(const EndPoint &end_point, const QPoint &pos);
+    void continueDrag(const QPoint &pos);
+    void endDrag(const QPoint &pos);
+    void adjustHotSopt(const EndPoint &end_point, const QPoint &pos);
+    Connection *connectionAt(const QPoint &pos) const;
+    EndPoint endPointAt(const QPoint &pos) const;
+    void paintConnection(QPainter *p, Connection *con,
+                         WidgetSet *heavy_highlight_set,
+                         WidgetSet *light_highlight_set) const;
+    void paintLabel(QPainter *p, EndPoint::Type type, Connection *con);
+
+
+    QPointer<QWidget> m_bg_widget;
+    QUndoStack *m_undo_stack;
+    bool m_enable_update_background;
+
+    Connection *m_tmp_con; // the connection we are currently editing
+    ConnectionList m_con_list;
+    bool m_start_connection_on_drag;
+    EndPoint m_end_point_under_mouse;
+    QPointer<QWidget> m_widget_under_mouse;
+
+    EndPoint m_drag_end_point;
+    QPoint m_old_source_pos, m_old_target_pos;
+    ConnectionSet m_sel_con_set;
+    const QColor m_inactive_color;
+    const QColor m_active_color;
+
+private:
+    friend class Connection;
+    friend class AddConnectionCommand;
+    friend class DeleteConnectionsCommand;
+    friend class SetEndPointCommand;
+};
+
+class QDESIGNER_SHARED_EXPORT CECommand : public QUndoCommand, public CETypes
+{
+public:
+   explicit  CECommand(ConnectionEdit *edit)
+        : m_edit(edit) {}
+
+    virtual bool mergeWith(const QUndoCommand *) { return false; }
+
+    ConnectionEdit *edit() const { return m_edit; }
+
+private:
+    ConnectionEdit *m_edit;
+};
+
+class QDESIGNER_SHARED_EXPORT AddConnectionCommand : public CECommand
+{
+public:
+    AddConnectionCommand(ConnectionEdit *edit, Connection *con);
+    virtual void redo();
+    virtual void undo();
+private:
+    Connection *m_con;
+};
+
+class QDESIGNER_SHARED_EXPORT DeleteConnectionsCommand : public CECommand
+{
+public:
+    DeleteConnectionsCommand(ConnectionEdit *edit, const ConnectionList &con_list);
+    virtual void redo();
+    virtual void undo();
+private:
+    ConnectionList m_con_list;
+};
+
+} // namespace qdesigner_internal
+
+QT_END_NAMESPACE
+
+#endif // CONNECTIONEDIT_H