mirror of
https://github.com/fralx/LimeReport.git
synced 2024-12-27 01:48:09 +03:00
69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
#include "lrgraphicsviewzoom.h"
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#include <QMouseEvent>
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#include <QApplication>
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#include <qmath.h>
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namespace LimeReport{
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GraphicsViewZoomer::GraphicsViewZoomer(QGraphicsView* view)
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: QObject(view), m_view(view)
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{
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m_view->viewport()->installEventFilter(this);
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m_view->setMouseTracking(true);
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m_modifiers = Qt::ControlModifier;
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m_zoomFactorBase = 1.0009;
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}
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void GraphicsViewZoomer::gentleZoom(double factor) {
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m_view->scale(factor, factor);
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m_view->centerOn(m_targetScenePos);
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QPointF delta_viewport_pos = m_targetViewportPos - QPointF(m_view->viewport()->width() / 2.0,
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m_view->viewport()->height() / 2.0);
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QPointF viewport_center = m_view->mapFromScene(m_targetScenePos) - delta_viewport_pos;
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m_view->centerOn(m_view->mapToScene(viewport_center.toPoint()));
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emit zoomed(factor);
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}
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void GraphicsViewZoomer::setModifiers(Qt::KeyboardModifiers modifiers) {
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m_modifiers = modifiers;
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}
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void GraphicsViewZoomer::setZoomFactorBase(double value) {
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m_zoomFactorBase = value;
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}
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void GraphicsViewZoomer::setView(QGraphicsView *view)
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{
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if (m_view!=view){
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m_view->viewport()->removeEventFilter(this);
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m_view = view;
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m_view->viewport()->installEventFilter(this);
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m_view->setMouseTracking(true);
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}
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}
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bool GraphicsViewZoomer::eventFilter(QObject *object, QEvent *event) {
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if (event->type() == QEvent::MouseMove) {
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QMouseEvent* mouse_event = static_cast<QMouseEvent*>(event);
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QPointF delta = m_targetViewportPos - mouse_event->pos();
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if (qAbs(delta.x()) > 5 || qAbs(delta.y()) > 5) {
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m_targetViewportPos = mouse_event->pos();
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m_targetScenePos = m_view->mapToScene(mouse_event->pos());
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}
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} else if (event->type() == QEvent::Wheel) {
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QWheelEvent* wheel_event = static_cast<QWheelEvent*>(event);
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if (QApplication::keyboardModifiers() == m_modifiers) {
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if (wheel_event->orientation() == Qt::Vertical) {
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double angle = wheel_event->delta();
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double factor = qPow(m_zoomFactorBase, angle);
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gentleZoom(factor);
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return true;
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}
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}
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}
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Q_UNUSED(object)
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return false;
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}
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} //namespace LimeReport
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