mirror of
https://github.com/qelectrotech/qelectrotech-source-mirror.git
synced 2026-10-07 20:34:14 +02:00
Beat Hangartner
5cad0c6159
A scene drops the event filters of an item that leaves it. The handles installed theirs once, in the constructor, and only if the text was in a scene: after the text was removed and added back (undoing a delete does that), or when the handles were made before the text was in a scene, they no longer reacted, and a drag moved the text instead. TextResizeHandles now installs the filters again whenever it enters a scene. Tests: dragAfterLeavingTheScene, dragWhenCreatedOutsideAScene (both fail before). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/*
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Copyright 2006-2026 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 TEXTRESIZEHANDLES_H
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#define TEXTRESIZEHANDLES_H
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#include "../textresize.h"
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#include <QCoreApplication>
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#include <QGraphicsObject>
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#include <QPointer>
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#include <QTransform>
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#include <QUndoCommand>
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#include <QVector>
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class QetGraphicsHandlerItem;
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class QGraphicsTextItem;
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/**
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@brief The TextResizeHandles class
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Four corner handles to change the width of a text box with the mouse.
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The opposite corner of the dragged one stays in place, the text wraps
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to the new width and the height of the box follows the text.
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Double-clicking a handle goes back to the automatic width.
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The text must have a qreal "textWidth" property (-1 = automatic width).
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The handles are a child of the text, so they follow it when it, or its
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symbol, is moved, rotated or zoomed (qelectrotech#1002).
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The width is changed live while dragging; the owner of the text makes
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the change undoable when resizeFinished() is emitted, by pushing a
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TextResizeCommand on its own undo stack.
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*/
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class TextResizeHandles : public QGraphicsObject
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{
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Q_OBJECT
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public:
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TextResizeHandles(QGraphicsTextItem *text, qreal handle_size = 10);
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~TextResizeHandles() override;
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QRectF boundingRect() const override;
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void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *) override {}
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QetGraphicsHandlerItem *handle(TextResize::Corner corner) const;
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void updateHandlesPos();
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signals:
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void resizeFinished(qreal old_width, qreal new_width,
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QPointF old_pos, QPointF new_pos);
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protected:
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bool sceneEventFilter(QGraphicsItem *watched, QEvent *event) override;
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QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;
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private:
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void installHandleFilters();
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void pressed(TextResize::Corner corner, const QPointF &scene_pos);
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void moved(const QPointF &scene_pos);
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void released();
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void resetToAutomaticWidth();
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qreal currentWidth() const;
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QGraphicsTextItem *m_text;
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QVector<QetGraphicsHandlerItem *> m_handles;
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QMetaObject::Connection m_size_connection;
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//The drag in progress
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bool m_dragging = false;
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TextResize::Corner m_dragged = TextResize::BottomRight;
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QTransform m_press_inverse;
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QPointF m_press_scene,
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m_fixed_local,
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m_fixed_scene,
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m_old_pos;
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qreal m_old_width = -1,
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m_min_width = 0;
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};
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/**
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@brief The TextResizeCommand class
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Undo a width change made with TextResizeHandles: the width, then the
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position, which keeps the opposite corner of the dragged one in place.
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Both are set in the same order on undo and redo, because a text may
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move itself when its width changes (to keep its alignment point).
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*/
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class TextResizeCommand : public QUndoCommand
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{
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Q_DECLARE_TR_FUNCTIONS(TextResizeCommand)
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public:
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TextResizeCommand(QGraphicsObject *text,
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qreal old_width, qreal new_width,
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const QPointF &old_pos, const QPointF &new_pos,
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QUndoCommand *parent = nullptr);
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void undo() override;
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void redo() override;
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private:
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void apply(qreal width, const QPointF &pos);
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QPointer<QGraphicsObject> m_text;
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qreal m_old_width,
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m_new_width;
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QPointF m_old_pos,
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m_new_pos;
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};
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#endif // TEXTRESIZEHANDLES_H
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