492 lines
17 KiB
C++
492 lines
17 KiB
C++
/************************************************************************
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**
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** @file vmaingraphicsview.cpp
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** @author Roman Telezhynskyi <dismine(at)gmail.com>
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** @date November 15, 2013
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**
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** @brief
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** @copyright
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** This source code is part of the Valentine project, a pattern making
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** program, whose allow create and modeling patterns of clothing.
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** Copyright (C) 2013-2015 Valentina project
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** <https://bitbucket.org/dismine/valentina> All Rights Reserved.
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**
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** Valentina 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 3 of the License, or
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** (at your option) any later version.
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**
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** Valentina 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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**
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** You should have received a copy of the GNU General Public License
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** along with Valentina. If not, see <http://www.gnu.org/licenses/>.
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**
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*************************************************************************/
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#include "vmaingraphicsview.h"
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#include <QTimeLine>
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#include <QWheelEvent>
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#include <QApplication>
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#include <QScrollBar>
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#include "vsimplecurve.h"
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#include "vmaingraphicsscene.h"
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#include <QGraphicsItem>
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#include <QMouseEvent>
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#include <qmath.h>
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const int GraphicsViewZoom::duration = 300;
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const int GraphicsViewZoom::updateInterval = 40;
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//---------------------------------------------------------------------------------------------------------------------
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GraphicsViewZoom::GraphicsViewZoom(QGraphicsView* view)
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: QObject(view),
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_view(view),
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_modifiers(Qt::ControlModifier),
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_zoom_factor_base(1.0015),
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target_scene_pos(QPointF()),
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target_viewport_pos(QPointF()),
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verticalScrollAnim(new QTimeLine(duration, this)),
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_numScheduledVerticalScrollings(0),
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horizontalScrollAnim(new QTimeLine(duration, this)),
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_numScheduledHorizontalScrollings(0)
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{
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_view->viewport()->installEventFilter(this);
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_view->setMouseTracking(true);
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verticalScrollAnim->setUpdateInterval(updateInterval);
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connect(verticalScrollAnim, &QTimeLine::valueChanged, this, &GraphicsViewZoom::VerticalScrollingTime);
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connect(verticalScrollAnim, &QTimeLine::finished, this, &GraphicsViewZoom::animFinished);
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horizontalScrollAnim->setUpdateInterval(updateInterval);
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connect(horizontalScrollAnim, &QTimeLine::valueChanged, this, &GraphicsViewZoom::HorizontalScrollingTime);
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connect(horizontalScrollAnim, &QTimeLine::finished, this, &GraphicsViewZoom::animFinished);
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}
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//---------------------------------------------------------------------------------------------------------------------
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void GraphicsViewZoom::gentle_zoom(double factor)
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{
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_view->scale(factor, factor);
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if (factor < 1)
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{
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// Because QGraphicsView centers the picture when it's smaller than the view. And QGraphicsView's scrolls
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// boundaries don't allow to put any picture point at any viewport position we will provide fictive scene size.
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// Temporary and bigger than view, scene size will help position an image under cursor.
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FictiveSceneRect(_view->scene(), _view);
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}
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_view->centerOn(target_scene_pos);
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QPointF delta_viewport_pos = target_viewport_pos - QPointF(_view->viewport()->width() / 2.0,
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_view->viewport()->height() / 2.0);
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QPointF viewport_center = _view->mapFromScene(target_scene_pos) - delta_viewport_pos;
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_view->centerOn(_view->mapToScene(viewport_center.toPoint()));
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// In the end we just set correct scene size
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VMainGraphicsView::NewSceneRect(_view->scene(), _view);
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emit zoomed();
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}
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//---------------------------------------------------------------------------------------------------------------------
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// cppcheck-suppress unusedFunction
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void GraphicsViewZoom::set_modifiers(Qt::KeyboardModifiers modifiers)
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{
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_modifiers = modifiers;
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}
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//---------------------------------------------------------------------------------------------------------------------
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// cppcheck-suppress unusedFunction
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void GraphicsViewZoom::set_zoom_factor_base(double value)
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{
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_zoom_factor_base = value;
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}
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//---------------------------------------------------------------------------------------------------------------------
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void GraphicsViewZoom::VerticalScrollingTime(qreal x)
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{
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Q_UNUSED(x);
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// Try to adapt scrolling to speed of rotating mouse wheel and scale factor
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// Value of _numScheduledScrollings is too short, so we scale the value
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qreal scroll = (qAbs(_numScheduledVerticalScrollings)*(10 + 10/_view->transform().m22()))/(duration/updateInterval);
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if (qAbs(scroll) < 1)
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{
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scroll = 1;
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}
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if (_numScheduledVerticalScrollings > 0)
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{
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scroll = scroll * -1;
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}
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_view->verticalScrollBar()->setValue(qRound(_view->verticalScrollBar()->value() + scroll));
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}
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//---------------------------------------------------------------------------------------------------------------------
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void GraphicsViewZoom::HorizontalScrollingTime(qreal x)
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{
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Q_UNUSED(x);
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// Try to adapt scrolling to speed of rotating mouse wheel and scale factor
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// Value of _numScheduledScrollings is too short, so we scale the value
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qreal scroll = (qAbs(_numScheduledHorizontalScrollings)*(10 + 10/_view->transform().m11()))/
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(duration/updateInterval);
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if (qAbs(scroll) < 1)
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{
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scroll = 1;
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}
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if (_numScheduledHorizontalScrollings > 0)
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{
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scroll = scroll * -1;
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}
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_view->horizontalScrollBar()->setValue(qRound(_view->horizontalScrollBar()->value() + scroll));
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}
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//---------------------------------------------------------------------------------------------------------------------
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void GraphicsViewZoom::animFinished()
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{
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_numScheduledVerticalScrollings = 0;
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verticalScrollAnim->stop();
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/*
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* In moust cases cursor position on view doesn't change, but for scene after scrolling position will be different.
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* We are goint to check changes and save new value.
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* If don't do that we will zoom using old value cursor position on scene. It is not what we expect.
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* Almoust the same we do in method GraphicsViewZoom::eventFilter.
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*/
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const QPoint pos = _view->mapFromGlobal(QCursor::pos());
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const QPointF delta = target_scene_pos - _view->mapToScene(pos);
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if (qAbs(delta.x()) > 5 || qAbs(delta.y()) > 5)
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{
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target_viewport_pos = pos;
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target_scene_pos = _view->mapToScene(pos);
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}
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}
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//---------------------------------------------------------------------------------------------------------------------
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bool GraphicsViewZoom::eventFilter(QObject *object, QEvent *event)
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{
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if (event->type() == QEvent::MouseMove)
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{
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/*
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* Here we are saving cursor position on view and scene.
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* This data need for gentle_zoom().
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* Almoust the same we do in method GraphicsViewZoom::animFinished.
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*/
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QMouseEvent* mouse_event = static_cast<QMouseEvent*>(event);
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QPointF delta = target_viewport_pos - mouse_event->pos();
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if (qAbs(delta.x()) > 5 || qAbs(delta.y()) > 5)
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{
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target_viewport_pos = mouse_event->pos();
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target_scene_pos = _view->mapToScene(mouse_event->pos());
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}
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return false;
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}
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else if (event->type() == QEvent::Wheel)
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{
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QWheelEvent* wheel_event = static_cast<QWheelEvent*>(event);
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SCASSERT(wheel_event != nullptr);
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if (QApplication::keyboardModifiers() == _modifiers)
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{
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if (wheel_event->orientation() == Qt::Vertical)
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{
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const double angle = wheel_event->angleDelta().y();
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const double factor = qPow(_zoom_factor_base, angle);
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gentle_zoom(factor);
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return true;
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}
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}
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else
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{
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if (QApplication::keyboardModifiers() == Qt::ShiftModifier)
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{
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return StartHorizontalScrollings(wheel_event);
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}
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else
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{
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return StartVerticalScrollings(wheel_event);
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}
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}
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}
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return QObject::eventFilter(object, event);
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}
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//---------------------------------------------------------------------------------------------------------------------
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void GraphicsViewZoom::FictiveSceneRect(QGraphicsScene *sc, QGraphicsView *view)
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{
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SCASSERT(sc != nullptr);
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SCASSERT(view != nullptr);
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//Calculate view rect
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//to receive the currently visible area, map the widgets bounds to the scene
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const QPointF a = view->mapToScene(0, 0 );
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const QPointF b = view->mapToScene(view->viewport()->width(), view->viewport()->height());
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QRectF viewRect = QRectF( a, b );
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//Scale view
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QLineF topLeftRay(viewRect.center(), viewRect.topLeft());
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topLeftRay.setLength(topLeftRay.length()*2);
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QLineF bottomRightRay(viewRect.center(), viewRect.bottomRight());
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bottomRightRay.setLength(bottomRightRay.length()*2);
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viewRect = QRectF(topLeftRay.p2(), bottomRightRay.p2());
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//Calculate scene rect
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const QRectF sceneRect = sc->sceneRect();
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//Unite two rects
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const QRectF newRect = sceneRect.united(viewRect);
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sc->setSceneRect(newRect);
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}
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//---------------------------------------------------------------------------------------------------------------------
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bool GraphicsViewZoom::StartVerticalScrollings(QWheelEvent *wheel_event)
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{
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SCASSERT(wheel_event != nullptr);
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const QPoint numPixels = wheel_event->pixelDelta();
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const QPoint numDegrees = wheel_event->angleDelta() / 8;
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int numSteps;
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if (not numPixels.isNull())
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{
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numSteps = numPixels.y();
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}
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else if (not numDegrees.isNull())
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{
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numSteps = numDegrees.y() / 15;
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}
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else
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{
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return true;//Just ignore
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}
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_numScheduledVerticalScrollings += numSteps;
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if (_numScheduledVerticalScrollings * numSteps < 0)
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{ // if user moved the wheel in another direction, we reset previously scheduled scalings
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_numScheduledVerticalScrollings = numSteps;
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}
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if (verticalScrollAnim->state() != QTimeLine::Running)
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{
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verticalScrollAnim->start();
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}
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return true;
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}
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//---------------------------------------------------------------------------------------------------------------------
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bool GraphicsViewZoom::StartHorizontalScrollings(QWheelEvent *wheel_event)
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{
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SCASSERT(wheel_event != nullptr);
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const QPoint numPixels = wheel_event->pixelDelta();
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const QPoint numDegrees = wheel_event->angleDelta() / 8;
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int numSteps;
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if (not numPixels.isNull())
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{
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numSteps = numPixels.y();
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}
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else if (not numDegrees.isNull())
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{
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numSteps = numDegrees.y() / 15;
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}
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else
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{
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return true;//Just ignore
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}
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_numScheduledHorizontalScrollings += numSteps;
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if (_numScheduledHorizontalScrollings * numSteps < 0)
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{ // if user moved the wheel in another direction, we reset previously scheduled scalings
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_numScheduledHorizontalScrollings = numSteps;
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}
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if (horizontalScrollAnim->state() != QTimeLine::Running)
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{
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horizontalScrollAnim->start();
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}
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return true;
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}
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//---------------------------------------------------------------------------------------------------------------------
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/**
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* @brief VMainGraphicsView constructor.
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* @param parent parent object.
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*/
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VMainGraphicsView::VMainGraphicsView(QWidget *parent)
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:QGraphicsView(parent), zoom(nullptr), showToolOptions(true), isAllowRubberBand(true)
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{
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zoom = new GraphicsViewZoom(this);
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this->setResizeAnchor(QGraphicsView::AnchorUnderMouse);
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this->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
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this->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
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this->setInteractive(true);
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}
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//---------------------------------------------------------------------------------------------------------------------
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void VMainGraphicsView::ZoomIn()
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{
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scale(1.1, 1.1);
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VMainGraphicsView::NewSceneRect(this->scene(), this);
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emit NewFactor(1.1);
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}
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//---------------------------------------------------------------------------------------------------------------------
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void VMainGraphicsView::ZoomOut()
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{
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scale(1.0/1.1, 1.0/1.1);
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VMainGraphicsView::NewSceneRect(this->scene(), this);
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emit NewFactor(1.0/1.1);
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}
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//---------------------------------------------------------------------------------------------------------------------
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void VMainGraphicsView::ZoomOriginal()
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{
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QTransform trans = this->transform();
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trans.setMatrix(1.0, trans.m12(), trans.m13(), trans.m21(), 1.0, trans.m23(), trans.m31(), trans.m32(),
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trans.m33());
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this->setTransform(trans);
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VMainGraphicsView::NewSceneRect(this->scene(), this);
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emit NewFactor(1.0);
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}
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//---------------------------------------------------------------------------------------------------------------------
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void VMainGraphicsView::ZoomFitBest()
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{
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VMainGraphicsScene *currentScene = qobject_cast<VMainGraphicsScene *>(scene());
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SCASSERT(currentScene);
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currentScene->SetOriginsVisible(false);
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const QRectF rect = currentScene->VisibleItemsBoundingRect();
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currentScene->SetOriginsVisible(true);
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if (rect.isEmpty())
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{
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return;
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}
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this->fitInView(rect, Qt::KeepAspectRatio);
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VMainGraphicsView::NewSceneRect(scene(), this);
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emit NewFactor(this->transform().m11());
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}
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//---------------------------------------------------------------------------------------------------------------------
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/**
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* @brief mousePressEvent handle mouse press events.
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* @param mousePress mouse press event.
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*/
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void VMainGraphicsView::mousePressEvent(QMouseEvent *mousePress)
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{
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switch (mousePress->button())
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{
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case Qt::LeftButton:
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{
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if (isAllowRubberBand)
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{
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QGraphicsView::setDragMode(QGraphicsView::RubberBandDrag);
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}
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if (showToolOptions)
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{
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QList<QGraphicsItem *> list = items(mousePress->pos());
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if (list.size() == 0)
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{
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emit itemClicked(nullptr);
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break;
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}
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for (int i = 0; i < list.size(); ++i)
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{
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if (this->scene()->items().contains(list.at(i)))
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{
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if (list.at(i)->type() <= VSimpleCurve::Type &&
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list.at(i)->type() > QGraphicsItem::UserType)
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{
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emit itemClicked(list.at(i));
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break;
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}
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else
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{
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emit itemClicked(nullptr);
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}
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}
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}
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}
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break;
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}
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case Qt::MiddleButton:
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{
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QGraphicsView::setDragMode(QGraphicsView::ScrollHandDrag);
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// create a new mouse event that simulates a click of the left button instead of the middle button
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QMouseEvent mouseEvent (mousePress->type(), mousePress->pos(), Qt::LeftButton, Qt::LeftButton,
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mousePress->modifiers());
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QGraphicsView::mousePressEvent(&mouseEvent);
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return;
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}
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default:
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break;
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}
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QGraphicsView::mousePressEvent(mousePress);
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}
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//---------------------------------------------------------------------------------------------------------------------
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/**
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* @brief mouseReleaseEvent handle mouse release events.
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* @param event mouse release event.
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*/
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void VMainGraphicsView::mouseReleaseEvent(QMouseEvent *event)
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{
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QGraphicsView::mouseReleaseEvent ( event ); // First because need to hide a rubber band
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QGraphicsView::setDragMode( QGraphicsView::NoDrag );
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if (event->button() == Qt::LeftButton)
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{
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emit MouseRelease();
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}
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}
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//---------------------------------------------------------------------------------------------------------------------
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void VMainGraphicsView::setShowToolOptions(bool value)
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{
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showToolOptions = value;
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}
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//---------------------------------------------------------------------------------------------------------------------
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void VMainGraphicsView::AllowRubberBand(bool value)
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{
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isAllowRubberBand = value;
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}
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//---------------------------------------------------------------------------------------------------------------------
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/**
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* @brief NewSceneRect calculate scene rect what contains all items and doesn't less that size of scene view.
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* @param sc scene.
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* @param view view.
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*/
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void VMainGraphicsView::NewSceneRect(QGraphicsScene *sc, QGraphicsView *view)
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{
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SCASSERT(sc != nullptr);
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SCASSERT(view != nullptr);
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//Calculate view rect
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const QRectF viewRect = SceneVisibleArea(view);
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//Calculate scene rect
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VMainGraphicsScene *currentScene = qobject_cast<VMainGraphicsScene *>(sc);
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SCASSERT(currentScene);
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const QRectF itemsRect = currentScene->VisibleItemsBoundingRect();
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//Unite two rects
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sc->setSceneRect(itemsRect.united(viewRect));
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}
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//---------------------------------------------------------------------------------------------------------------------
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QRectF VMainGraphicsView::SceneVisibleArea(QGraphicsView *view)
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{
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SCASSERT(view != nullptr);
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//to receive the currently visible area, map the widgets bounds to the scene
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return QRectF(view->mapToScene(0, 0), view->mapToScene(view->width(), view->height()));
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}
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