135 lines
4.4 KiB
C++
135 lines
4.4 KiB
C++
/************************************************************************
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**
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** @file vmaingraphicsview.h
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** @author Roman Telezhynskyi <dismine(at)gmail.com>
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** @date November 15, 2013
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**
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** @brief
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** @copyright
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** This source code is part of the Valentine project, a pattern making
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** program, whose allow create and modeling patterns of clothing.
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** Copyright (C) 2013 Valentina project
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** <https://bitbucket.org/dismine/valentina> All Rights Reserved.
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**
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** Valentina is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** Valentina is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with Valentina. If not, see <http://www.gnu.org/licenses/>.
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**
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*************************************************************************/
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#ifndef VMAINGRAPHICSVIEW_H
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#define VMAINGRAPHICSVIEW_H
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#include <QObject>
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#include <QGraphicsView>
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/*!
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* This class adds ability to zoom QGraphicsView using mouse wheel. The point under cursor
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* remains motionless while it's possible.
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*
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* Note that it becomes not possible when the scene's
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* size is not large enough comparing to the viewport size. QGraphicsView centers the picture
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* when it's smaller than the view. And QGraphicsView's scrolls boundaries don't allow to
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* put any picture point at any viewport position.
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*
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* When the user starts scrolling, this class remembers original scene position and
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* keeps it until scrolling is completed. It's better than getting original scene position at
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* each scrolling step because that approach leads to position errors due to before-mentioned
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* positioning restrictions.
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*
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* When zommed using scroll, this class emits zoomed() signal.
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*
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* Usage:
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*
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* new Graphics_view_zoom(view);
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*
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* The object will be deleted automatically when the view is deleted.
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*
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* You can set keyboard modifiers used for zooming using set_modified(). Zooming will be
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* performed only on exact match of modifiers combination. The default modifier is Ctrl.
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*
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* You can change zoom velocity by calling set_zoom_factor_base().
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* Zoom coefficient is calculated as zoom_factor_base^angle_delta
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* (see QWheelEvent::angleDelta).
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* The default zoom factor base is 1.0015.
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*/
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class QTimeLine;
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class GraphicsViewZoom : public QObject
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{
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Q_OBJECT
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public:
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GraphicsViewZoom(QGraphicsView* view);
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void gentle_zoom(double factor);
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void set_modifiers(Qt::KeyboardModifiers modifiers);
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void set_zoom_factor_base(double value);
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signals:
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void zoomed();
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public slots:
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void scrollingTime(qreal x);
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void animFinished();
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private:
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QGraphicsView* _view;
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Qt::KeyboardModifiers _modifiers;
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double _zoom_factor_base;
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QPointF target_scene_pos;
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QPointF target_viewport_pos;
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QTimeLine *anim;
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bool eventFilter(QObject* object, QEvent* event);
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private:
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Q_DISABLE_COPY(GraphicsViewZoom)
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/** @brief _numScheduledScalings keep number scheduled scalings. */
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qint32 _numScheduledScalings;
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};
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/**
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* @brief The VMainGraphicsView class main scene view.
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*/
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class VMainGraphicsView : public QGraphicsView
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{
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Q_OBJECT
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public:
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explicit VMainGraphicsView(QWidget *parent = nullptr);
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void setShowToolOptions(bool value);
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signals:
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/**
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* @brief NewFactor send new scale factor.
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* @param factor scene scale factor.
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*/
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void NewFactor(qreal factor);
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/**
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* @brief MouseRelease help catch mouse release event.
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*
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* Usefull when you need show dialog after working with tool visualization.
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*/
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void MouseRelease();
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void itemClicked(QGraphicsItem *item);
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public slots:
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void ZoomIn();
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void ZoomOut();
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void ZoomOriginal();
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void ZoomFitBest();
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protected:
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void mousePressEvent(QMouseEvent *mousePress);
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void mouseReleaseEvent(QMouseEvent *event);
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private:
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Q_DISABLE_COPY(VMainGraphicsView)
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GraphicsViewZoom* zoom;
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bool showToolOptions;
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};
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#endif // VMAINGRAPHICSVIEW_H
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