placeable_window_proxy.h

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//
// Copyright (c) 2014, Southwest Research Institute® (SwRI®)
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#ifndef MAPVIZ_PLUGINS_PLACEABLE_WINDOW_PROXY_H
#define MAPVIZ_PLUGINS_PLACEABLE_WINDOW_PROXY_H

#include <QObject>
#include <QRect>
#include <QPoint>

QT_BEGIN_NAMESPACE;
class QMouseEvent;
class QResizeEvent;
QT_END_NAMESPACE;

namespace mapviz_plugins
{
  class PlaceableWindowProxy : public QObject
  {
  Q_OBJECT

  public:
    PlaceableWindowProxy();
    ~PlaceableWindowProxy();

    void setContainer(QWidget *);

    QRect rect() const;

  Q_SIGNALS:
    void rectChanged(const QRect &);

  public Q_SLOTS:
    void setRect(const QRect &);
    void setVisible(bool visible);

  protected:
    bool eventFilter(QObject *object, QEvent *event);

    bool handleMousePress(QMouseEvent *);
    bool handleMouseRelease(QMouseEvent *);
    bool handleMouseMove(QMouseEvent *);
    bool handleResize(QResizeEvent *);

    void timerEvent(QTimerEvent *);

    void rectResize(int dx, int dy);
    void winResize(const QSize &);

    QRectF resizeHelper(const QRectF &rect,
                        const QPointF &p1,
                        const QPointF &p2,
                        const QPointF &p3) const;



  private:
    enum State {
      INACTIVE = 0,
      MOVE_ALL,
      MOVE_TOP_LEFT,
      MOVE_BOTTOM_LEFT,
      MOVE_BOTTOM_RIGHT,
      MOVE_TOP_RIGHT
    };

    QWidget *target_;
    bool visible_;

    bool has_cursor_;
    State state_;
    QRectF rect_;

    QRectF start_rect_;
    QPoint start_point_;

    int win_resize_timer_;

    State getNextState(const QPointF &pt) const;
  };  // class PlaceableWindowProxy
}  // namespace mapviz_plugins
#endif //MAPVIZ_PLUGINS_CANVAS_CLICK_FILTER_H