VisualizationDragWidget.cpp
50 lines
| 1.3 KiB
| text/x-c
|
CppLexer
| r841 | #include "Visualization/VisualizationDragWidget.h" | |||
| #include "Visualization/VisualizationDragDropContainer.h" | ||||
| #include <QMouseEvent> | ||||
| #include <QApplication> | ||||
| struct VisualizationDragWidget::VisualizationDragWidgetPrivate { | ||||
| QPoint m_dragStartPosition; | ||||
| bool m_dragStartPositionValid = false; | ||||
| explicit VisualizationDragWidgetPrivate() | ||||
| { | ||||
| } | ||||
| }; | ||||
| VisualizationDragWidget::VisualizationDragWidget(QWidget* parent) | ||||
| : QWidget{parent}, impl{spimpl::make_unique_impl<VisualizationDragWidgetPrivate>()} | ||||
| { | ||||
| } | ||||
| void VisualizationDragWidget::mousePressEvent(QMouseEvent *event) | ||||
| { | ||||
| if (event->button() == Qt::LeftButton) | ||||
| impl->m_dragStartPosition = event->pos(); | ||||
| impl->m_dragStartPositionValid = isDragAllowed(); | ||||
| QWidget::mousePressEvent(event); | ||||
| } | ||||
| void VisualizationDragWidget::mouseMoveEvent(QMouseEvent *event) | ||||
| { | ||||
| if (!impl->m_dragStartPositionValid || !isDragAllowed()) | ||||
| return; | ||||
| if (!(event->buttons() & Qt::LeftButton)) | ||||
| return; | ||||
| if (!event->modifiers().testFlag(Qt::AltModifier)) | ||||
| return; | ||||
| if ((event->pos() - impl->m_dragStartPosition).manhattanLength() < QApplication::startDragDistance()) | ||||
| return; | ||||
| emit dragDetected(this, impl->m_dragStartPosition); | ||||
| QWidget::mouseMoveEvent(event); | ||||
| } | ||||
