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connect(view-verticalScrollBar(),QScrollBar::valueChanged,this,chunzhongForm::slot_VvalueChanged);
connect(view-horizontalScrollBar(),QScrollBar::valueChanged,this,chunzhongForm::slot_HvalueChanged);void chunzhongForm::slot_VvalueChanged(int value)
{if(value ! 0 dlg ! NULL){m_y value;if(dlg-isVisible()){emit signalSetDrawRectSize();}}
}void chunzhongForm::slot_HvalueChanged(int value)
{if(value ! 0 dlg ! NULL){m_x value;if(dlg-isVisible()){emit signalSetDrawRectSize();}}
}connect(this,chunzhongForm::signalSetDrawRectSize,this,chunzhongForm::slot_setViewRect);QSize GraphicsView::viewportSizeHint()
{return viewport()-size();
}void chunzhongForm::slot_setViewRect()
{m_viewSize view-viewportSizeHint();//获取视口大小int x m_x / (m_viewSize.width() * m_scale)* SMALL_W;int y m_y / (m_viewSize.height() * m_scale)* SMALL_H;int wid SMALL_W / m_scale;int hei SMALL_H / m_scale;outPut小矩形坐标及大小(m_x ,m_y ,wid ,hei);//换成qDebug输出QRect rect(x,y,wid,hei);emit signalDrawRect(rect);
}
connect(this,chunzhongForm::signalDrawRect,dlg,BreviaryDlg::slot_setRectSize);//缩略图窗口类BreviaryDlg
void BreviaryDlg::slot_setRectSize(QRect rect)
{m_rect rect;scene-onSetPreviewRect(rect);
}//缩略图中的自定义场景
void MyGraphicsScene::onSetPreviewRect(QRect rect)
{m_rectSaved rect;// 内缩几个像素用矩形外边框来标示viewport显示区域m_pRectItem-setRect(rect.x() - 2/* 5*/, rect.y() - 2/* 5*/, rect.width() - 4, rect.height() - 4);//设置图形项矩形
}下面贴出自定义场景类 MyGraphicsScene.h
#pragma once//#include vld.h
#include QGraphicsSceneclass MyGraphicsScene : public QGraphicsScene
{Q_OBJECTpublic:MyGraphicsScene(QObject *parent nullptr);virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent);virtual void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);Q_SIGNALS:void previewRectMoved(QRect rect);public Q_SLOTS:void onSetPreviewRect(QRect rect);private:QGraphicsRectItem* m_pRectItem;QRect m_rectSaved;bool m_bRectClicked;QPoint m_ptRectRelated; // 鼠标点击时相对于红色矩形框的位置
};MyGraphicsScene.cpp
#include MyGraphicsScene.h
#include QGraphicsSceneMouseEvent
#include QGraphicsRectItem
#include QDebugMyGraphicsScene::MyGraphicsScene(QObject *parent): QGraphicsScene(parent), m_bRectClicked(false)
{m_pRectItem new QGraphicsRectItem(0, 0, 0, 0);QPen penRectItem QPen(QColor(255, 0, 0));penRectItem.setWidth(2);m_pRectItem-setPen(penRectItem);m_pRectItem-setZValue(1);addItem(m_pRectItem);
}void MyGraphicsScene::onSetPreviewRect(QRect rect)
{m_rectSaved rect;// 内缩几个像素用矩形外边框来标示viewport显示区域m_pRectItem-setRect(rect.x() - 2/* 5*/, rect.y() - 2/* 5*/, rect.width() - 4, rect.height() - 4);
}void MyGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent)
{QGraphicsScene::mouseMoveEvent(mouseEvent);if (m_bRectClicked) {QPoint ptTopLeft mouseEvent-scenePos().toPoint() - m_ptRectRelated;m_rectSaved.setTopLeft(ptTopLeft);
// qDebug()mouseMoveEvent;emit previewRectMoved(m_rectSaved);}
}void MyGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
{QGraphicsScene::mousePressEvent(mouseEvent);if (m_rectSaved.contains(mouseEvent-scenePos().x(), mouseEvent-scenePos().y())) {m_bRectClicked true;m_ptRectRelated mouseEvent-scenePos().toPoint() - m_rectSaved.topLeft();}
}void MyGraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
{QGraphicsScene::mouseReleaseEvent(mouseEvent);m_bRectClicked false;
}
