HG_REPOSITORIES/LPP/INSTRUMENTATION/USERS/JEANDET/qtcharts Files · example/zoomlinechart/chartwidget.cpp

Better way to enable features to user. Do less, but expose signals to user and allow user to descide what to do.

Michal Klocek - - Load All Authors

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             chartwidget.cpp
        
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             / example / zoomlinechart / chartwidget.cpp
          
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      #include "chartwidget.h"

      #include <QMouseEvent>

      ChartWidget::ChartWidget(QWidget *parent)

          : QChartView(parent),

       m_rubberBand(QRubberBand::Rectangle,this)

      {

      }

      void ChartWidget::mousePressEvent(QMouseEvent *event)

      {

          if(event->button()!=Qt::LeftButton) return;

          int margin = this->margin();

          QRect rect(margin,margin,width()-2*margin,height()-2*margin);

          m_origin = event->pos();

          if (!rect.contains(m_origin)) return;

          m_rubberBand.setGeometry(QRect(m_origin, QSize()));

          m_rubberBand.show();

          event->accept();

      }

      void ChartWidget::mouseMoveEvent(QMouseEvent *event)

      {

          if(m_rubberBand.isVisible())

              m_rubberBand.setGeometry(QRect(m_origin, event->pos()).normalized());

      }

      void ChartWidget::mouseReleaseEvent(QMouseEvent *event)

      {

          if( event->button()==Qt::LeftButton && m_rubberBand.isVisible()) {

              m_rubberBand.hide();

              QRect rect = m_rubberBand.geometry();

              zoomIn(rect);

              event->accept();

          }

          if(event->button()==Qt::RightButton) {

              zoomOut();

          }

      }

      void ChartWidget::keyPressEvent(QKeyEvent *event)

      {

          switch (event->key()) {

          case Qt::Key_Plus:

              zoomIn();

              break;

          case Qt::Key_Minus:

              zoomOut();

              break;

          default:

              QGraphicsView::keyPressEvent(event);

              break;

          }

      }

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				#include "chartwidget.h"
				#include <QMouseEvent>

				ChartWidget::ChartWidget(QWidget *parent)
				: QChartView(parent),
				m_rubberBand(QRubberBand::Rectangle,this)
				{
				}

				void ChartWidget::mousePressEvent(QMouseEvent *event)
				{
				if(event->button()!=Qt::LeftButton) return;

				int margin = this->margin();

				QRect rect(margin,margin,width()-2margin,height()-2margin);

				m_origin = event->pos();

				if (!rect.contains(m_origin)) return;

				m_rubberBand.setGeometry(QRect(m_origin, QSize()));
				m_rubberBand.show();

				event->accept();
				}

				void ChartWidget::mouseMoveEvent(QMouseEvent *event)
				{
				if(m_rubberBand.isVisible())
				m_rubberBand.setGeometry(QRect(m_origin, event->pos()).normalized());
				}

				void ChartWidget::mouseReleaseEvent(QMouseEvent *event)
				{
				if( event->button()==Qt::LeftButton && m_rubberBand.isVisible()) {
				m_rubberBand.hide();

				QRect rect = m_rubberBand.geometry();
				zoomIn(rect);
				event->accept();
				}

				if(event->button()==Qt::RightButton) {
				zoomOut();
				}
				}


				void ChartWidget::keyPressEvent(QKeyEvent *event)
				{
				switch (event->key()) {
				case Qt::Key_Plus:
				zoomIn();
				break;
				case Qt::Key_Minus:
				zoomOut();
				break;
				default:
				QGraphicsView::keyPressEvent(event);
				break;
				}
				}