Warning, file /office/calligra/libs/flake/KoSnapGuide.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /* This file is part of the KDE project
  * Copyright (C) 2008-2009 Jan Hambrecht <jaham@gmx.net>
  *
  * 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, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "KoSnapGuide.h"
 #include "KoSnapProxy.h"
 #include "KoSnapStrategy.h"
 
 #include <KoPathShape.h>
 #include <KoPathPoint.h>
 #include <KoViewConverter.h>
 #include <KoCanvasBase.h>
 
 #include <QPainter>
 #include <QPainterPath>
 
 #include <math.h>
 
 
 class Q_DECL_HIDDEN KoSnapGuide::Private
 {
 public:
     Private(KoCanvasBase *parentCanvas)
         : canvas(parentCanvas), editedShape(0), currentStrategy(0),
         active(true),
         snapDistance(10)
     {
     }
 
     ~Private()
     {
         qDeleteAll(strategies);
         strategies.clear();
     }
 
     KoCanvasBase *canvas;
     KoShape *editedShape;
 
     QList<KoSnapStrategy*> strategies;
     KoSnapStrategy *currentStrategy;
 
     KoSnapGuide::Strategies usedStrategies;
     bool active;
     int snapDistance;
     QList<KoPathPoint*> ignoredPoints;
     QList<KoShape*> ignoredShapes;
 };
 
 KoSnapGuide::KoSnapGuide(KoCanvasBase *canvas)
     : d(new Private(canvas))
 {
     d->strategies.append(new GridSnapStrategy());
     d->strategies.append(new NodeSnapStrategy());
     d->strategies.append(new OrthogonalSnapStrategy());
     d->strategies.append(new ExtensionSnapStrategy());
     d->strategies.append(new IntersectionSnapStrategy());
     d->strategies.append(new BoundingBoxSnapStrategy());
     d->strategies.append(new LineGuideSnapStrategy());
 }
 
 KoSnapGuide::~KoSnapGuide()
 {
     delete d;
 }
 
 void KoSnapGuide::setEditedShape(KoShape *shape)
 {
     d->editedShape = shape;
 }
 
 KoShape *KoSnapGuide::editedShape() const
 {
     return d->editedShape;
 }
 
 void KoSnapGuide::enableSnapStrategies(Strategies strategies)
 {
     d->usedStrategies = strategies;
 }
 
 KoSnapGuide::Strategies KoSnapGuide::enabledSnapStrategies() const
 {
     return d->usedStrategies;
 }
 
 bool KoSnapGuide::addCustomSnapStrategy(KoSnapStrategy *customStrategy)
 {
     if (!customStrategy || customStrategy->type() != CustomSnapping)
         return false;
 
     d->strategies.append(customStrategy);
     return true;
 }
 
 void KoSnapGuide::enableSnapping(bool on)
 {
     d->active = on;
 }
 
 bool KoSnapGuide::isSnapping() const
 {
     return d->active;
 }
 
 void KoSnapGuide::setSnapDistance(int distance)
 {
     d->snapDistance = qAbs(distance);
 }
 
 int KoSnapGuide::snapDistance() const
 {
     return d->snapDistance;
 }
 
 QPointF KoSnapGuide::snap(const QPointF &mousePosition, Qt::KeyboardModifiers modifiers)
 {
     d->currentStrategy = 0;
 
     if (! d->active || (modifiers & Qt::ShiftModifier))
         return mousePosition;
 
     KoSnapProxy proxy(this);
 
     qreal minDistance = HUGE_VAL;
 
     qreal maxSnapDistance = d->canvas->viewConverter()->viewToDocument(QSizeF(d->snapDistance,
                 d->snapDistance)).width();
 
     foreach (KoSnapStrategy *strategy, d->strategies) {
         if (d->usedStrategies & strategy->type()
                 || strategy->type() == GridSnapping || strategy->type() == CustomSnapping) {
             if (! strategy->snap(mousePosition, &proxy, maxSnapDistance))
                 continue;
 
             QPointF snapCandidate = strategy->snappedPosition();
             qreal distance = KoSnapStrategy::squareDistance(snapCandidate, mousePosition);
             if (distance < minDistance) {
                 d->currentStrategy = strategy;
                 minDistance = distance;
             }
         }
     }
 
     if (! d->currentStrategy)
         return mousePosition;
 
     return d->currentStrategy->snappedPosition();
 }
 
 QRectF KoSnapGuide::boundingRect() const
 {
     QRectF rect;
 
     if (d->currentStrategy) {
         rect = d->currentStrategy->decoration(*d->canvas->viewConverter()).boundingRect();
         return rect.adjusted(-2, -2, 2, 2);
     } else {
         return rect;
     }
 }
 
 void KoSnapGuide::paint(QPainter &painter, const KoViewConverter &converter)
 {
     if (! d->currentStrategy || ! d->active)
         return;
 
     QPainterPath decoration = d->currentStrategy->decoration(converter);
 
     painter.setBrush(Qt::NoBrush);
 
     QPen whitePen(Qt::white, 0);
     whitePen.setStyle(Qt::SolidLine);
     painter.setPen(whitePen);
     painter.drawPath(decoration);
 
     QPen redPen(Qt::red, 0);
     redPen.setStyle(Qt::DotLine);
     painter.setPen(redPen);
     painter.drawPath(decoration);
 }
 
 KoCanvasBase *KoSnapGuide::canvas() const
 {
     return d->canvas;
 }
 
 void KoSnapGuide::setIgnoredPathPoints(const QList<KoPathPoint*> &ignoredPoints)
 {
     d->ignoredPoints = ignoredPoints;
 }
 
 QList<KoPathPoint*> KoSnapGuide::ignoredPathPoints() const
 {
     return d->ignoredPoints;
 }
 
 void KoSnapGuide::setIgnoredShapes(const QList<KoShape*> &ignoredShapes)
 {
     d->ignoredShapes = ignoredShapes;
 }
 
 QList<KoShape*> KoSnapGuide::ignoredShapes() const
 {
     return d->ignoredShapes;
 }
 
 void KoSnapGuide::reset()
 {
     d->currentStrategy = 0;
     d->editedShape = 0;
     d->ignoredPoints.clear();
     d->ignoredShapes.clear();
     // remove all custom strategies
     int strategyCount = d->strategies.count();
     for (int i = strategyCount-1; i >= 0; --i) {
         if (d->strategies[i]->type() == CustomSnapping) {
             delete d->strategies[i];
             d->strategies.removeAt(i);
         }
     }
 }