File indexing completed on 2024-05-19 04:36:35

 /* This file is part of the TikZKit project.
  *
  * Copyright (C) 2013-2014 Dominik Haumann <dhaumann@kde.org>
  *
  * This library is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Library General Public License as published
  * by the Free Software Foundation, either version 2 of the License, or
  * (at your option) any later version.
  *
  * This library 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 Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, see
  * <http://www.gnu.org/licenses/>.
  */
 
 #include "Handle.h"
 
 #include <QPainter>
 #include <QStyleOptionGraphicsItem>
 #include <QGraphicsSceneMouseEvent>
 #include <QGraphicsView>
 
 #include <QDebug>
 
 namespace tikz {
 namespace ui {
 
 Handle::Handle(Type type, Position position)
     : TikzItem()
     , m_type(type)
     , m_position(position)
 {
     // by default, only left mouse button triggers events
     setAcceptedMouseButtons(Qt::LeftButton);
 
     // show above paths and nodes
     setZValue(10.0);
 
     // force visually the same size, independent of zooming
     setFlag(ItemIgnoresTransformations, true);
 
     // set correct rect size
     setRect(QRectF(-4, -4, 8, 8));
 }
 
 Handle::~Handle()
 {
 }
 
 int Handle::type() const
 {
     return UserType + 5;
 }
 
 Handle::Position Handle::handlePos() const
 {
     return m_position;
 }
 
 Handle::Type Handle::handleType() const
 {
     return m_type;
 }
 
 QRectF Handle::rect() const
 {
     return m_handleRect;
 }
 
 void Handle::setRect(const QRectF & rect)
 {
     prepareGeometryChange();
     m_handleRect = rect;
     update();
 }
 
 void Handle::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     Q_UNUSED(widget);
     Q_UNUSED(option);
 
     // debugging
 //     painter->drawRect(boundingRect());
 }
 
 QRectF Handle::boundingRect() const
 {
     return m_handleRect.adjusted(0, 0, 1, 1);
 }
 
 bool Handle::isActive() const
 {
     return m_active;
 }
 
 void Handle::activate()
 {
     if (!m_active) {
         m_active = true;
         update();
     }
 }
 
 void Handle::deactivate()
 {
     if (m_active) {
         m_active = false;
         update();
     }
 }
 
 /**
  * Helper to find the QGraphicsView that sent this @p event.
  * The return value may be 0 for user-generated mouse events.
  */
 static QGraphicsView * viewForEvent(QGraphicsSceneEvent * event)
 {
     QWidget *viewport = event->widget();
     if (viewport) {
         return qobject_cast<QGraphicsView *>(viewport->parent());
     }
     return nullptr;
 }
 
 void Handle::mouseMoveEvent(QGraphicsSceneMouseEvent * event)
 {
     Q_EMIT positionChanged(this, event->scenePos(), viewForEvent(event));
 
     event->accept();
 }
 
 void Handle::mousePressEvent(QGraphicsSceneMouseEvent * event)
 {
     if (event->button() == Qt::LeftButton) {
         Q_EMIT mousePressed(this, event->scenePos(), viewForEvent(event));
 
         activate();
 
         event->accept();
     }
 }
 
 void Handle::mouseReleaseEvent(QGraphicsSceneMouseEvent * event)
 {
     if (event->button() == Qt::LeftButton) {
         Q_EMIT mouseReleased(this, event->scenePos(), viewForEvent(event));
 
         deactivate();
 
         event->accept();
     }
 }
 
 }
 }
 
 // kate: indent-width 4; replace-tabs on;