first commit

scene/picscene.cpp

@@ -0,0 +1,148 @@
+#include "picscene.h"
+#include <QDebug>
+#include <QRectF>
+#include <QPainter>
+#include <QGraphicsView>
+PicScene::PicScene(QObject *parent) :
+    QGraphicsScene(parent),IsdrawBackground(false),
+    currFocusItem(nullptr)
+{
+    connect(this, &QGraphicsScene::focusItemChanged, this, &PicScene::onFocusItemChanged);
+}
+
+void PicScene::setMode(Mode mode)
+{
+    myMode = mode;
+}
+
+void PicScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    if (mouseEvent->button() != Qt::LeftButton)
+        return;
+
+    QGraphicsScene::mousePressEvent(mouseEvent);
+}
+
+//! [9]
+
+//! [10]
+void PicScene::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    update();//edit@12-12
+    QGraphicsScene::mouseMoveEvent(mouseEvent);
+}
+//! [10]
+
+//! [11]
+void PicScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
+{
+    QGraphicsScene::mouseReleaseEvent(mouseEvent);
+}
+//! [13]
+
+//! [14]
+bool PicScene::isItemChange(int type)
+{
+    foreach (QGraphicsItem *item, selectedItems()) {
+        if (item->type() == type)
+            return true;
+    }
+    return false;
+}
+//! [14]
+
+void PicScene::keyPressEvent(QKeyEvent *event)
+{
+    QGraphicsScene::keyPressEvent(event);
+}
+//edit@12-09
+void PicScene::drawBackground(QPainter *painter, const QRectF &rect)
+{
+    QGraphicsScene::drawBackground(painter,rect);
+
+    if(IsdrawBackground)
+    {
+        QPen pen;
+
+        // 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
+        const qreal left   = sceneRect().left();
+        const qreal right  = sceneRect().right();
+        const qreal top    = sceneRect().top();
+        const qreal bottom = sceneRect().bottom();
+
+        const int step=1;
+        //pen.setColor(QColor(60,60,60));
+        pen.setColor(Qt::lightGray);
+        //pen.setColor(Qt::darkCyan);
+        pen.setWidth(0);
+        //pen.setStyle(Qt::DashLine);
+        painter->setPen(pen);
+        //绘制横线
+        //绘制Y轴正半轴
+        for(int i=0;i>=top;i-=step)
+        {
+            painter->drawLine(left,i,right,i);
+        }
+
+        //绘制Y轴负半轴
+        for(int i=0;i<=bottom;i+=step)
+        {
+            painter->drawLine(left,i,right,i);
+        }
+
+        //绘制竖线
+        //绘制X轴正半轴
+        for(int i=0;i<=right;i+=step)
+        {
+            painter->drawLine(i,top,i,bottom);
+        }
+        //绘制X轴负半轴
+        for(int i=0;i>=left;i-=step)
+        {
+            painter->drawLine(i,top,i,bottom);
+        }
+
+        //edit@12-11
+        pen.setColor(Qt::green);
+        painter->setPen(pen);
+        QRectF BoundingRect=this->itemsBoundingRect();
+        //BoundingRect.setHeight(32);
+        painter->drawRect(BoundingRect);
+    }
+
+    emit showTextWidthHeight();
+}
+//edit@12-09
+void PicScene::setIsdrawBackground(bool newIsdrawBackground)
+{
+    IsdrawBackground = newIsdrawBackground;
+}
+
+void PicScene::onFocusItemChanged(QGraphicsItem *newFocusItem, QGraphicsItem *oldFocusItem, Qt::FocusReason reason)
+{
+    // 断开旧的连接
+    if(currFocusItem) {
+        disconnect(currFocusItem, &QGraphicsObject::xChanged, this, &PicScene::onFocusedItemPosChanged);
+        disconnect(currFocusItem, &QGraphicsObject::yChanged, this, &PicScene::onFocusedItemPosChanged);
+    }
+
+    // 只对对所有继承于QGraphicsObject的Item有效
+    // 仅有继承于QGraphicsObject的item实现了x，y changed信号
+    currFocusItem = dynamic_cast<QGraphicsObject*>(newFocusItem);
+    if(!currFocusItem){
+        // Nothing
+        return;
+    }
+
+    QPoint pos(currFocusItem->x(), currFocusItem->y());
+    emit focusedItemPosChanged(pos);
+
+    connect(currFocusItem, &QGraphicsObject::xChanged, this, &PicScene::onFocusedItemPosChanged);
+    connect(currFocusItem, &QGraphicsObject::yChanged, this, &PicScene::onFocusedItemPosChanged);
+}
+
+void PicScene::onFocusedItemPosChanged()
+{
+    if(currFocusItem)
+        emit focusedItemPosChanged(currFocusItem->pos().toPoint());
+}