GIT_REPOSITORIES/LPP/Users/mperrinel/SciQLop-fork Commit - r179:765885a6f6ff

Handles key modifiers for zoom...

Alexandre Leroux -

r179:765885a6f6ff

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r179:765885a6f6ff

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gui/include/Visualization/VisualizationGraphWidget.h +4 0

             #ifndef SCIQLOP_VISUALIZATIONGRAPHWIDGET_H
             #define SCIQLOP_VISUALIZATIONGRAPHWIDGET_H
             #include "Visualization/IVisualizationWidget.h"
             #include <QWidget>
             #include <memory>
             #include <Common/spimpl.h>
             class Variable;
             namespace Ui {
             class VisualizationGraphWidget;
             } // namespace Ui
             class VisualizationGraphWidget : public QWidget, public IVisualizationWidget {
                 Q_OBJECT
             public:
                 explicit VisualizationGraphWidget(QWidget *parent = 0);
                 virtual ~VisualizationGraphWidget();
                 void addVariable(std::shared_ptr<Variable> variable);
                 // IVisualizationWidget interface
                 void accept(IVisualizationWidget *visitor) override;
                 void close() override;
                 QString name() const;
             private:
                 Ui::VisualizationGraphWidget *ui;
                 class VisualizationGraphWidgetPrivate;
                 spimpl::unique_impl_ptr<VisualizationGraphWidgetPrivate> impl;
+            private slots:
+                /// Slot called when a mouse wheel was made, to perform some processing before the zoom is done
+                void onMouseWheel(QWheelEvent *event) noexcept;
             };
             #endif // SCIQLOP_VISUALIZATIONGRAPHWIDGET_H

gui/src/Visualization/VisualizationGraphWidget.cpp +29 0

             #include "Visualization/VisualizationGraphWidget.h"
             #include "ui_VisualizationGraphWidget.h"
             #include <Variable/Variable.h>
             #include <unordered_map>
+            namespace {
+            /// Key pressed to enable zoom on horizontal axis
+            const auto HORIZONTAL_ZOOM_MODIFIER = Qt::NoModifier;
+            /// Key pressed to enable zoom on vertical axis
+            const auto VERTICAL_ZOOM_MODIFIER = Qt::ControlModifier;
+            } // namespace
             struct VisualizationGraphWidget::VisualizationGraphWidgetPrivate {
                 // 1 variable -> n qcpplot
                 std::unordered_map<std::shared_ptr<Variable>, std::unique_ptr<QCPAbstractPlottable> >
                     m_VariableToPlotMap;
             };
             VisualizationGraphWidget::VisualizationGraphWidget(QWidget *parent)
                     : QWidget{parent},
                       ui{new Ui::VisualizationGraphWidget},
                       impl{spimpl::make_unique_impl<VisualizationGraphWidgetPrivate>()}
             {
                 ui->setupUi(this);
                 // Set qcpplot properties :
                 // - Drag and zoom are enabled
+                // - Mouse wheel on qcpplot is intercepted to determine the zoom orientation
                 ui->widget->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);
+                connect(ui->widget, &QCustomPlot::mouseWheel, this, &VisualizationGraphWidget::onMouseWheel);
             }
             VisualizationGraphWidget::~VisualizationGraphWidget()
             {
                 delete ui;
             }
             void VisualizationGraphWidget::addVariable(std::shared_ptr<Variable> variable)
             {
                 // todo: first check is variable contains data then check how many plot have to be created
             }
             void VisualizationGraphWidget::accept(IVisualizationWidget *visitor)
             {
                 // TODO: manage the visitor
             }
             void VisualizationGraphWidget::close()
             {
                 // The main view cannot be directly closed.
                 return;
             }
             QString VisualizationGraphWidget::name() const
             {
                 return QStringLiteral("MainView");
             }
+            void VisualizationGraphWidget::onMouseWheel(QWheelEvent *event) noexcept
+            {
+                auto zoomOrientations = QFlags<Qt::Orientation>{};
+                // Lambda that enables a zoom orientation if the key modifier related to this orientation has
+                // been pressed
+                auto enableOrientation
+                    = [&zoomOrientations, event](const auto &orientation, const auto &modifier) {
+                          auto orientationEnabled = event->modifiers().testFlag(modifier);
+                          zoomOrientations.setFlag(orientation, orientationEnabled);
+                      };
+                enableOrientation(Qt::Vertical, VERTICAL_ZOOM_MODIFIER);
+                enableOrientation(Qt::Horizontal, HORIZONTAL_ZOOM_MODIFIER);
+                ui->widget->axisRect()->setRangeZoom(zoomOrientations);
+            }

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