valentina/src/app/widgets/vmaingraphicsview.h

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/************************************************************************
**
** @file vmaingraphicsview.h
** @author Roman Telezhynskyi <dismine(at)gmail.com>
** @date November 15, 2013
**
** @brief
** @copyright
** This source code is part of the Valentine project, a pattern making
** program, whose allow create and modeling patterns of clothing.
** Copyright (C) 2013 Valentina project
** <https://bitbucket.org/dismine/valentina> All Rights Reserved.
**
** Valentina 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.
**
** Valentina 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 Valentina. If not, see <http://www.gnu.org/licenses/>.
**
*************************************************************************/
#ifndef VMAINGRAPHICSVIEW_H
#define VMAINGRAPHICSVIEW_H
#include <QObject>
#include <QGraphicsView>
/*!
* This class adds ability to zoom QGraphicsView using mouse wheel. The point under cursor
* remains motionless while it's possible.
*
* Note that it becomes not possible when the scene's
* size is not large enough comparing to the viewport size. QGraphicsView centers the picture
* when it's smaller than the view. And QGraphicsView's scrolls boundaries don't allow to
* put any picture point at any viewport position.
*
* When the user starts scrolling, this class remembers original scene position and
* keeps it until scrolling is completed. It's better than getting original scene position at
* each scrolling step because that approach leads to position errors due to before-mentioned
* positioning restrictions.
*
* When zommed using scroll, this class emits zoomed() signal.
*
* Usage:
*
* new Graphics_view_zoom(view);
*
* The object will be deleted automatically when the view is deleted.
*
* You can set keyboard modifiers used for zooming using set_modified(). Zooming will be
* performed only on exact match of modifiers combination. The default modifier is Ctrl.
*
* You can change zoom velocity by calling set_zoom_factor_base().
* Zoom coefficient is calculated as zoom_factor_base^angle_delta
* (see QWheelEvent::angleDelta).
* The default zoom factor base is 1.0015.
*/
class GraphicsViewZoom : public QObject
{
Q_OBJECT
public:
GraphicsViewZoom(QGraphicsView* view);
void gentle_zoom(double factor);
void set_modifiers(Qt::KeyboardModifiers modifiers);
void set_zoom_factor_base(double value);
signals:
void zoomed();
public slots:
void scrollingTime(qreal x);
void animFinished();
private:
QGraphicsView* _view;
Qt::KeyboardModifiers _modifiers;
double _zoom_factor_base;
QPointF target_scene_pos;
QPointF target_viewport_pos;
bool eventFilter(QObject* object, QEvent* event);
private:
/** @brief _numScheduledScalings keep number scheduled scalings. */
qint32 _numScheduledScalings;
};
/**
* @brief The VMainGraphicsView class main scene view.
*/
class VMainGraphicsView : public QGraphicsView
{
Q_OBJECT
public:
explicit VMainGraphicsView(QWidget *parent = nullptr);
signals:
/**
* @brief NewFactor send new scale factor.
* @param factor scene scale factor.
*/
void NewFactor(qreal factor);
/**
* @brief MouseRelease help catch mouse release event.
*
* Usefull when you need show dialog after working with tool visualization.
*/
void MouseRelease();
void itemClicked(QGraphicsItem *item);
public slots:
void ZoomIn();
void ZoomOut();
void ZoomOriginal();
void ZoomFitBest();
protected:
void mousePressEvent(QMouseEvent *mousePress);
void mouseReleaseEvent(QMouseEvent *event);
private:
GraphicsViewZoom* zoom;
};
#endif // VMAINGRAPHICSVIEW_H