valentina/src/libs/vwidgets/vmaingraphicsview.cpp

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/************************************************************************
**
** @file vmaingraphicsview.cpp
** @author Roman Telezhynskyi <dismine(at)gmail.com>
** @date November 15, 2013
**
** @brief
** @copyright
** This source code is part of the Valentine project, a pattern making
** program, whose allow create and modeling patterns of clothing.
** Copyright (C) 2013-2015 Valentina project
** <https://bitbucket.org/dismine/valentina> All Rights Reserved.
**
** Valentina is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** Valentina 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with Valentina. If not, see <http://www.gnu.org/licenses/>.
**
*************************************************************************/
#include "vmaingraphicsview.h"
#include <QTimeLine>
#include <QWheelEvent>
#include <QApplication>
#include <QScrollBar>
#include "vsimplepoint.h"
#include "vmaingraphicsscene.h"
#include <QGraphicsItem>
#include <QMouseEvent>
#include <qmath.h>
//---------------------------------------------------------------------------------------------------------------------
GraphicsViewZoom::GraphicsViewZoom(QGraphicsView* view)
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: QObject(view), _view(view), _modifiers(Qt::ControlModifier), _zoom_factor_base(1.0015),
target_scene_pos(QPointF()), target_viewport_pos(QPointF()), anim(nullptr), _numScheduledScalings(0)
{
_view->viewport()->installEventFilter(this);
_view->setMouseTracking(true);
anim = new QTimeLine(300, this);
anim->setUpdateInterval(20);
connect(anim, &QTimeLine::valueChanged, this, &GraphicsViewZoom::scrollingTime, Qt::UniqueConnection);
connect(anim, &QTimeLine::finished, this, &GraphicsViewZoom::animFinished, Qt::UniqueConnection);
}
//---------------------------------------------------------------------------------------------------------------------
void GraphicsViewZoom::gentle_zoom(double factor)
{
_view->scale(factor, factor);
if (factor < 1)
{
// Because QGraphicsView centers the picture when it's smaller than the view. And QGraphicsView's scrolls
// boundaries don't allow to put any picture point at any viewport position we will provide fictive scene size.
// Temporary and bigger than view, scene size will help position an image under cursor.
FictiveSceneRect(_view->scene(), _view);
}
_view->centerOn(target_scene_pos);
QPointF delta_viewport_pos = target_viewport_pos - QPointF(_view->viewport()->width() / 2.0,
_view->viewport()->height() / 2.0);
QPointF viewport_center = _view->mapFromScene(target_scene_pos) - delta_viewport_pos;
_view->centerOn(_view->mapToScene(viewport_center.toPoint()));
// In the end we just set correct scene size
VMainGraphicsView::NewSceneRect(_view->scene(), _view);
emit zoomed();
}
//---------------------------------------------------------------------------------------------------------------------
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// cppcheck-suppress unusedFunction
void GraphicsViewZoom::set_modifiers(Qt::KeyboardModifiers modifiers)
{
_modifiers = modifiers;
}
//---------------------------------------------------------------------------------------------------------------------
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// cppcheck-suppress unusedFunction
void GraphicsViewZoom::set_zoom_factor_base(double value)
{
_zoom_factor_base = value;
}
//---------------------------------------------------------------------------------------------------------------------
void GraphicsViewZoom::scrollingTime(qreal x)
{
Q_UNUSED(x);
qreal scroll = _view->verticalScrollBar()->pageStep()/60;
if (_numScheduledScalings > 0)
{
scroll = scroll * -1;
}
_view->verticalScrollBar()->setValue(qRound(_view->verticalScrollBar()->value() + scroll));
}
//---------------------------------------------------------------------------------------------------------------------
void GraphicsViewZoom::animFinished()
{
_numScheduledScalings > 0 ? _numScheduledScalings-- : _numScheduledScalings++;
anim->stop();
/*
* In moust cases cursor position on view doesn't change, but for scene after scrolling position will be different.
* We are goint to check changes and save new value.
* If don't do that we will zoom using old value cursor position on scene. It is not what we expect.
* Almoust the same we do in method GraphicsViewZoom::eventFilter.
*/
const QPoint pos = _view->mapFromGlobal(QCursor::pos());
const QPointF delta = target_scene_pos - _view->mapToScene(pos);
if (qAbs(delta.x()) > 5 || qAbs(delta.y()) > 5)
{
target_viewport_pos = pos;
target_scene_pos = _view->mapToScene(pos);
}
}
//---------------------------------------------------------------------------------------------------------------------
bool GraphicsViewZoom::eventFilter(QObject *object, QEvent *event)
{
if (event->type() == QEvent::MouseMove)
{
/*
* Here we are saving cursor position on view and scene.
* This data need for gentle_zoom().
* Almoust the same we do in method GraphicsViewZoom::animFinished.
*/
QMouseEvent* mouse_event = static_cast<QMouseEvent*>(event);
QPointF delta = target_viewport_pos - mouse_event->pos();
if (qAbs(delta.x()) > 5 || qAbs(delta.y()) > 5)
{
target_viewport_pos = mouse_event->pos();
target_scene_pos = _view->mapToScene(mouse_event->pos());
}
return false;
}
else if (event->type() == QEvent::Wheel)
{
QWheelEvent* wheel_event = static_cast<QWheelEvent*>(event);
if (QApplication::keyboardModifiers() == _modifiers)
{
if (wheel_event->orientation() == Qt::Vertical)
{
double angle = wheel_event->angleDelta().y();
double factor = qPow(_zoom_factor_base, angle);
gentle_zoom(factor);
return true;
}
}
else
{
const QPoint numPixels = wheel_event->pixelDelta();
const QPoint numDegrees = wheel_event->angleDelta() / 8;
int numSteps;
if (not numPixels.isNull())
{
numSteps = numPixels.y();
}
else if (not numDegrees.isNull())
{
numSteps = numDegrees.y() / 15;
}
else
{
return true;//Just ignore
}
_numScheduledScalings += numSteps;
if (_numScheduledScalings * numSteps < 0)
{ // if user moved the wheel in another direction, we reset
_numScheduledScalings = numSteps; // previously scheduled scalings
}
if (anim->state() != QTimeLine::Running)
{
anim->start();
}
return true;
}
}
return QObject::eventFilter(object, event);
}
//---------------------------------------------------------------------------------------------------------------------
void GraphicsViewZoom::FictiveSceneRect(QGraphicsScene *sc, QGraphicsView *view)
{
SCASSERT(sc != nullptr);
SCASSERT(view != nullptr);
//Calculate view rect
//to receive the currently visible area, map the widgets bounds to the scene
const QPointF a = view->mapToScene(0, 0 );
const QPointF b = view->mapToScene(view->viewport()->width(), view->viewport()->height());
QRectF viewRect = QRectF( a, b );
//Scale view
QLineF topLeftRay(viewRect.center(), viewRect.topLeft());
topLeftRay.setLength(topLeftRay.length()*2);
QLineF bottomRightRay(viewRect.center(), viewRect.bottomRight());
bottomRightRay.setLength(bottomRightRay.length()*2);
viewRect = QRectF(topLeftRay.p2(), bottomRightRay.p2());
//Calculate scene rect
const QRectF sceneRect = sc->sceneRect();
//Unite two rects
const QRectF newRect = sceneRect.united(viewRect);
sc->setSceneRect(newRect);
}
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief VMainGraphicsView constructor.
* @param parent parent object.
*/
VMainGraphicsView::VMainGraphicsView(QWidget *parent)
:QGraphicsView(parent), zoom(nullptr), showToolOptions(true)
{
zoom = new GraphicsViewZoom(this);
this->setResizeAnchor(QGraphicsView::AnchorUnderMouse);
this->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
this->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
this->setInteractive(true);
}
//---------------------------------------------------------------------------------------------------------------------
void VMainGraphicsView::ZoomIn()
{
scale(1.1, 1.1);
VMainGraphicsView::NewSceneRect(this->scene(), this);
emit NewFactor(1.1);
}
//---------------------------------------------------------------------------------------------------------------------
void VMainGraphicsView::ZoomOut()
{
scale(1.0/1.1, 1.0/1.1);
VMainGraphicsView::NewSceneRect(this->scene(), this);
emit NewFactor(1.0/1.1);
}
//---------------------------------------------------------------------------------------------------------------------
void VMainGraphicsView::ZoomOriginal()
{
QTransform trans = this->transform();
trans.setMatrix(1.0, trans.m12(), trans.m13(), trans.m21(), 1.0, trans.m23(), trans.m31(), trans.m32(),
trans.m33());
this->setTransform(trans);
VMainGraphicsView::NewSceneRect(this->scene(), this);
emit NewFactor(1.0);
}
//---------------------------------------------------------------------------------------------------------------------
void VMainGraphicsView::ZoomFitBest()
{
VMainGraphicsScene *currentScene = qobject_cast<VMainGraphicsScene *>(scene());
SCASSERT(currentScene);
currentScene->SetOriginsVisible(false);
const QRectF rect = currentScene->VisibleItemsBoundingRect();
currentScene->SetOriginsVisible(true);
if (rect.isEmpty())
{
return;
}
this->fitInView(rect, Qt::KeepAspectRatio);
VMainGraphicsView::NewSceneRect(scene(), this);
emit NewFactor(this->transform().m11());
}
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief mousePressEvent handle mouse press events.
* @param mousePress mouse press event.
*/
void VMainGraphicsView::mousePressEvent(QMouseEvent *mousePress)
{
if (mousePress->button() & Qt::LeftButton)
{
switch (QGuiApplication::keyboardModifiers())
{
case Qt::ControlModifier:
QGraphicsView::setDragMode(QGraphicsView::ScrollHandDrag);
break;
case Qt::NoModifier:
if (showToolOptions)
{
QList<QGraphicsItem *> list = items(mousePress->pos());
if (list.size() == 0)
{
emit itemClicked(nullptr);
break;
}
for (int i = 0; i < list.size(); ++i)
{
if (this->scene()->items().contains(list.at(i)))
{
if (list.at(i)->type() <= VSimplePoint::Type &&
list.at(i)->type() > QGraphicsItem::UserType)
{
emit itemClicked(list.at(i));
break;
}
else
{
emit itemClicked(nullptr);
}
}
}
}
break;
default:
break;
}
}
QGraphicsView::mousePressEvent(mousePress);
}
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief mouseReleaseEvent handle mouse release events.
* @param event mouse release event.
*/
void VMainGraphicsView::mouseReleaseEvent(QMouseEvent *event)
{
QGraphicsView::mouseReleaseEvent ( event );
QGraphicsView::setDragMode( QGraphicsView::RubberBandDrag );
if (event->button() == Qt::LeftButton)
{
emit MouseRelease();
}
}
//---------------------------------------------------------------------------------------------------------------------
void VMainGraphicsView::setShowToolOptions(bool value)
{
showToolOptions = value;
}
//---------------------------------------------------------------------------------------------------------------------
/**
* @brief NewSceneRect calculate scene rect what contains all items and doesn't less that size of scene view.
* @param sc scene.
* @param view view.
*/
void VMainGraphicsView::NewSceneRect(QGraphicsScene *sc, QGraphicsView *view)
{
SCASSERT(sc != nullptr);
SCASSERT(view != nullptr);
//Calculate view rect
//to receive the currently visible area, map the widgets bounds to the scene
const QPointF a = view->mapToScene(0, 0);
const QPointF b = view->mapToScene(view->width(), view->height());
const QRectF viewRect = QRectF( a, b );
//Calculate scene rect
VMainGraphicsScene *currentScene = qobject_cast<VMainGraphicsScene *>(sc);
SCASSERT(currentScene);
const QRectF itemsRect = currentScene->VisibleItemsBoundingRect();
//Unite two rects
sc->setSceneRect(itemsRect.united(viewRect));
}