125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
#include "myview.h"
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#include <QWheelEvent>
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#include <QMouseEvent>
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#include <QScrollBar>
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#include "picscene.h"
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#include <QDebug>
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MyView::MyView(QWidget *parent) :
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QGraphicsView(parent)
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{
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zoomRatio = 1;
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//setDragMode(QGraphicsView::ScrollHandDrag);//手型拖动
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//setAlignment(Qt::AlignLeft | Qt::AlignTop);
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//setFocusPolicy( Qt::NoFocus );
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}
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// static float a = 1.615;
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static float a = 1.64;
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void MyView::ZoomOut(void)
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{
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if(zoomRatio < 6)
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{
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zoomRatio++;
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// scale(2,2);
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scale(a,a);
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}
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}
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void MyView::ZoomIn(void)
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{
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if(zoomRatio > 2)
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{
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zoomRatio--;
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scale(1/a,1/a);
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}
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}
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//void MyView::wheelEvent(QWheelEvent*event) //滚轮事件
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//{
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//// if(event->delta() > 0) //如果鼠标滚轮远离使用者，则delta()返回正值
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//// scale(0.5,0.5); //视图缩放
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//// else scale(2,2);
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//}
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//void MyView::mousePressEvent(QMouseEvent*event)
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//{
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//// rotate(90); //视图旋转顺时针90度
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//}
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void MyView::mousePressEvent(QMouseEvent *event)
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{
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if (event->button() == Qt::LeftButton) {
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m_isPressing = true;
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const QPointF scenePos = mapToScene(event->pos());
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const bool hasSelectedItem = scene() && !scene()->selectedItems().isEmpty();
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m_pressOnItem = hasSelectedItem || (scene() && scene()->itemAt(scenePos, transform()) != nullptr);
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m_lastPanPoint = event->pos();
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}
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QGraphicsView::mousePressEvent(event);
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}
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void MyView::mouseMoveEvent(QMouseEvent *event)
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{
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if (m_isPressing && !m_pressOnItem && !m_isPanning) {
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const bool noSelectedItems = scene() && scene()->selectedItems().isEmpty();
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if (noSelectedItems) {
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QPoint delta = event->pos() - m_lastPanPoint;
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if (std::abs(delta.x()) >= MyView::PanStartDistance && std::abs(delta.x()) > std::abs(delta.y())) {
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m_isPanning = true;
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setCursor(Qt::ClosedHandCursor);
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}
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}
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}
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if (m_isPanning) {
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int deltaX = event->pos().x() - m_lastPanPoint.x();
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if (deltaX != 0) {
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horizontalScrollBar()->setValue(horizontalScrollBar()->value() - deltaX);
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m_lastPanPoint = event->pos();
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}
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event->accept();
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return;
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}
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QGraphicsView::mouseMoveEvent(event);
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}
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void MyView::mouseReleaseEvent(QMouseEvent *event)
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{
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if (m_isPanning && event->button() == Qt::LeftButton) {
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m_isPanning = false;
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m_isPressing = false;
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setCursor(Qt::ArrowCursor);
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event->accept();
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return;
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}
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if (event->button() == Qt::LeftButton) {
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m_isPressing = false;
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m_pressOnItem = false;
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}
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QGraphicsView::mouseReleaseEvent(event);
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}
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void MyView::keyPressEvent(QKeyEvent *event)
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{
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//event->accept();
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//parent()->event((QEvent*) event);
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if (event->key() == Qt::Key_Left || event->key() == Qt::Key_Right || event->key() == Qt::Key_Up || event->key() == Qt::Key_Down)
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{
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// 处理上下键事件
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PicScene* picScene = dynamic_cast<PicScene*>(this->scene());
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if(picScene)
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{
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picScene->keyPressEvent(event);
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}
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}
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else
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{
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// 其他键事件交给父类处理
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QGraphicsView::keyPressEvent(event);
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}
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}
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