Canvas.h

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/*

Copyright (C) 2011-2018 Michael Goffioul

This file is part of Octave.

Octave is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Octave is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<https://www.gnu.org/licenses/>.

*/

#if ! defined (octave_Canvas_h)
#define octave_Canvas_h 1

#include <QPoint>

#include "graphics.h"

#include "Figure.h"

class QKeyEvent;
class QMouseEvent;
class QWheelEvent;
class QWidget;

class octave_value_list;

namespace QtHandles
{

  class Canvas
  {
  public:
    enum EventMask
    {
      KeyPress   = 0x01,
      KeyRelease = 0x02
    };

  public:
    virtual ~Canvas (void) = default;

    void redraw (bool sync = false);
    void blockRedraw (bool block = true);

    void print (const QString& file_cmd, const QString& term)
    {
      do_print (file_cmd, term, m_handle);
    }

    void addEventMask (int m) { m_eventMask |= m; }
    void clearEventMask (int m) { m_eventMask &= (~m); }
    void setEventMask (int m) { m_eventMask = m; }

    void setCursor (MouseMode mode);

    virtual QWidget * qWidget (void) = 0;

    static Canvas * create (const std::string& name, QWidget *parent,
                            const graphics_handle& handle);

    virtual void toggleAxes (const graphics_handle& handle) = 0;
    virtual void toggleGrid (const graphics_handle& handle) = 0;
    virtual void autoAxes (const graphics_handle& handle) = 0;

    virtual uint8NDArray getPixels (void) { return do_getPixels (m_handle); };

  protected:
    virtual void draw (const graphics_handle& handle) = 0;
    virtual void drawZoomBox (const QPoint& p1, const QPoint& p2) = 0;
    virtual void resize (int x, int y, int width, int height) = 0;
    virtual graphics_object selectFromAxes (const graphics_object& ax,
                                            const QPoint& pt) = 0;
    virtual uint8NDArray do_getPixels (const graphics_handle& handle) = 0;
    virtual void do_print (const QString& file_cmd, const QString& term,
                           const graphics_handle& handle) = 0;

  protected:
    Canvas (const graphics_handle& handle)
      : m_handle (handle),
        m_redrawBlocked (false),
        m_mouseMode (NoMode),
        m_clickMode (false),
        m_eventMask (0),
        m_rectMode (false)
    { }

    void canvasToggleAxes (const graphics_handle& handle);
    void canvasToggleGrid (const graphics_handle& handle);
    void canvasAutoAxes (const graphics_handle& handle);
    void canvasPaintEvent (void);
    void canvasMouseDoubleClickEvent (QMouseEvent *event);
    void canvasMouseMoveEvent (QMouseEvent *event);
    void canvasMousePressEvent (QMouseEvent *event);
    void canvasMouseReleaseEvent (QMouseEvent *event);
    void canvasWheelEvent (QWheelEvent *event);
    bool canvasKeyPressEvent (QKeyEvent *event);
    bool canvasKeyReleaseEvent (QKeyEvent *event);

    void updateCurrentPoint (const graphics_object& fig,
                             const graphics_object& obj, QMouseEvent *event);
    void updateCurrentPoint (const graphics_object& fig,
                             const graphics_object& obj);

    void annotation_callback (const octave_value_list& args);
    void select_object (graphics_object obj, QMouseEvent *event,
                        graphics_object& currentObj, graphics_object& axesObj,
                        bool axes_only = false,
                        std::vector<std::string> omit = std::vector<std::string> ());

  private:
    graphics_handle m_handle;
    bool m_redrawBlocked;
    MouseMode m_mouseMode;
    bool m_clickMode;              // True: ZoomIn, False: ZoomOut
    QPoint m_mouseAnchor;
    QPoint m_mouseCurrent;
    graphics_handle m_mouseAxes;
    int m_eventMask;
    bool m_rectMode;
  };

}

#endif