151 lines
3.9 KiB
C++
151 lines
3.9 KiB
C++
#include "picscene.h"
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#include <QDebug>
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#include <QRectF>
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#include <QPainter>
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#include <QGraphicsView>
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PicScene::PicScene(QObject *parent) :
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QGraphicsScene(parent),IsdrawBackground(false),
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currFocusItem(nullptr)
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{
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connect(this, &QGraphicsScene::focusItemChanged, this, &PicScene::onFocusItemChanged);
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}
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void PicScene::setMode(Mode mode)
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{
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myMode = mode;
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}
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void PicScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
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{
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if (mouseEvent->button() != Qt::LeftButton)
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return;
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QGraphicsScene::mousePressEvent(mouseEvent);
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}
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//! [9]
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//! [10]
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void PicScene::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent)
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{
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update();//edit@12-12
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QGraphicsScene::mouseMoveEvent(mouseEvent);
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}
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//! [10]
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//! [11]
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void PicScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
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{
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QGraphicsScene::mouseReleaseEvent(mouseEvent);
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}
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//! [13]
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//! [14]
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bool PicScene::isItemChange(int type)
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{
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foreach (QGraphicsItem *item, selectedItems()) {
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if (item->type() == type)
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return true;
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}
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return false;
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}
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//! [14]
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void PicScene::keyPressEvent(QKeyEvent *event)
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{
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QGraphicsScene::keyPressEvent(event);
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}
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//edit@12-09
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void PicScene::drawBackground(QPainter *painter, const QRectF &rect)
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{
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QGraphicsScene::drawBackground(painter,rect);
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if(IsdrawBackground)
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{
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QPen pen;
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// 使用sceneRect()而不是参数rect，因为rect是由view设置的，其依赖于当前view的大小
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const qreal left = sceneRect().left();
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const qreal right = sceneRect().right();
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const qreal top = sceneRect().top();
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const qreal bottom = sceneRect().bottom();
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const int step=1;
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//pen.setColor(QColor(60,60,60));
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pen.setColor(Qt::lightGray);
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//pen.setColor(Qt::darkCyan);
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pen.setWidth(0);
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//pen.setStyle(Qt::DashLine);
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painter->setPen(pen);
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//绘制横线
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//绘制Y轴正半轴
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for(int i=0;i>=top;i-=step)
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{
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painter->drawLine(left,i,right,i);
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}
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//绘制Y轴负半轴
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for(int i=0;i<=bottom;i+=step)
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{
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painter->drawLine(left,i,right,i);
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}
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//绘制竖线
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//绘制X轴正半轴
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for(int i=0;i<=right;i+=step)
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{
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painter->drawLine(i,top,i,bottom);
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}
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//绘制X轴负半轴
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for(int i=0;i>=left;i-=step)
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{
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painter->drawLine(i,top,i,bottom);
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}
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//edit@12-11
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pen.setColor(Qt::green);
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painter->setPen(pen);
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QRectF BoundingRect=this->itemsBoundingRect();
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//BoundingRect.setHeight(32);
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painter->drawRect(BoundingRect);
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}
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emit showTextWidthHeight();
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}
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//edit@12-09
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void PicScene::setIsdrawBackground(bool newIsdrawBackground)
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{
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IsdrawBackground = newIsdrawBackground;
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}
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void PicScene::onFocusItemChanged(QGraphicsItem *newFocusItem, QGraphicsItem *oldFocusItem, Qt::FocusReason reason)
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{
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// 断开旧的连接
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if(currFocusItem) {
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disconnect(currFocusItem, &QGraphicsObject::xChanged, this, &PicScene::onFocusedItemPosChanged);
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disconnect(currFocusItem, &QGraphicsObject::yChanged, this, &PicScene::onFocusedItemPosChanged);
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}
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// 只对对所有继承于QGraphicsObject的Item有效
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// 仅有继承于QGraphicsObject的item实现了x，y changed信号
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currFocusItem = dynamic_cast<QGraphicsObject*>(newFocusItem);
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if(!currFocusItem){
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// Nothing
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return;
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}
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QPoint pos(currFocusItem->x(), currFocusItem->y());
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emit focusedItemPosChanged(pos);
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connect(currFocusItem, &QGraphicsObject::xChanged, this, &PicScene::onFocusedItemPosChanged);
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connect(currFocusItem, &QGraphicsObject::yChanged, this, &PicScene::onFocusedItemPosChanged);
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}
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void PicScene::onFocusedItemPosChanged()
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{
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if(currFocusItem)
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emit focusedItemPosChanged(currFocusItem->pos().toPoint());
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}
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