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130 lines
4.9 KiB
C++
130 lines
4.9 KiB
C++
/*
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Copyright 2006-2020 The QElectroTech Team
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This file is part of QElectroTech.
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QElectroTech 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 2 of the License, or
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(at your option) any later version.
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QElectroTech 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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You should have received a copy of the GNU General Public License
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along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ELEMENTPRIMITIVEDECORATOR_H
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#define ELEMENTPRIMITIVEDECORATOR_H
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#include "../qet.h"
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#include <QGraphicsObject>
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class ElementEditionCommand;
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class ElementScene;
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class CustomElementPart;
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class QetGraphicsHandlerItem;
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/**
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This class represents a decorator rendered above selected items so users
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can manipulate (move, resize, ...) them.
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The implementation considers four kinds of bounding rects:
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- the actual, effective bounding rect as returned by the boundingRect() method
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- the original bounding rect, i.e. the rect containing all selected items at
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the beginning of operations (or after a command object was generated)
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- the new bounding rect, after the user moved or resized items
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- the former bounding rect, due to implementation details
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*/
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class ElementPrimitiveDecorator : public QGraphicsObject
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{
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Q_OBJECT
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public:
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ElementPrimitiveDecorator(QGraphicsItem * = nullptr);
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~ElementPrimitiveDecorator() override;
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enum { Type = UserType + 2200 };
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// methods
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QRectF internalBoundingRect() const;
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QRectF boundingRect () const override;
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void paint(QPainter *,
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const QStyleOptionGraphicsItem *,
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QWidget * = nullptr) override;
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int type() const override { return Type; }
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void setItems(const QList<QGraphicsItem *> &);
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void setItems(const QList<CustomElementPart *> &);
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QList<CustomElementPart *> items() const;
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QList<QGraphicsItem *> graphicsItems() const;
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public slots:
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void adjust();
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signals:
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void actionFinished(ElementEditionCommand *);
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protected:
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void mousePressEvent(QGraphicsSceneMouseEvent *) override;
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void mouseMoveEvent(QGraphicsSceneMouseEvent *) override;
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void mouseReleaseEvent(QGraphicsSceneMouseEvent *) override;
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void keyPressEvent(QKeyEvent *) override;
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void keyReleaseEvent(QKeyEvent *) override;
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QPointF deltaForRoundScaling(const QRectF &, const QRectF &, qreal);
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QPointF snapConstPointToGrid(const QPointF &) const;
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void snapPointToGrid(QPointF &) const;
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bool mustSnapToGrid(QGraphicsSceneMouseEvent *);
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QET::ScalingMethod scalingMethod(QGraphicsSceneMouseEvent *);
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QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;
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bool sceneEventFilter(QGraphicsItem *watched, QEvent *event) override;
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private:
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void init();
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void saveOriginalBoundingRect();
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void adjustEffectiveBoundingRect();
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void startMovement();
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void applyMovementToRect(int, const QPointF &, QRectF &);
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CustomElementPart *singleItem() const;
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void translateItems(const QPointF &);
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void scaleItems(const QRectF &, const QRectF &);
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QRectF getSceneBoundingRect(QGraphicsItem *) const;
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QVector <QPointF> getResizingsPoints() const;
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private:
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void adjusteHandlerPos();
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void handlerMousePressEvent (QetGraphicsHandlerItem *qghi, QGraphicsSceneMouseEvent *event);
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void handlerMouseMoveEvent (QetGraphicsHandlerItem *qghi, QGraphicsSceneMouseEvent *event);
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void handlerMouseReleaseEvent (QetGraphicsHandlerItem *qghi, QGraphicsSceneMouseEvent *event);
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void addHandler();
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void removeHandler();
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QList<CustomElementPart *> decorated_items_;
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QRectF effective_bounding_rect_; ///< actual, effective bounding rect -- never shrinks
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QRectF original_bounding_rect_; ///< original bounding rect
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QRectF modified_bounding_rect_; ///< new bounding rect, after the user moved or resized items
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/**
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Index of the square leading the current operation (resizing, etc.) or -1 if no
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operation is occurring, -2 for a move operation.
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*/
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int current_operation_square_;
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int grid_step_x_; ///< Grid horizontal step
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int grid_step_y_; ///< Grid horizontal step
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QPointF first_pos_; ///< First point involved within the current resizing operation
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QPointF latest_pos_; ///< Latest point involved within the current resizing operation
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QPointF mouse_offset_; ///< Offset between the mouse position and the point to be snapped to grid when moving selection
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bool moving_by_keys_; ///< Whether we are currently moving our decorated items using the arrow keys
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QPointF keys_movement_; ///< Movement applied to our decorated items using the arrow keys
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QVector<QetGraphicsHandlerItem *> m_handler_vector;
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int m_vector_index = -1;
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};
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#endif
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