From 448f0771258d7b0d21a3fa3eb92f1e49e86e1aba Mon Sep 17 00:00:00 2001
From: lipengpeng <lipengpeng@xinje.cc>
Date: Wed, 6 Aug 2025 19:15:23 +0800
Subject: [PATCH] =?UTF-8?q?PLC=E6=A8=A1=E5=9D=97=E7=9A=84=E7=BC=96?=
 =?UTF-8?q?=E8=BE=91=E7=95=8C=E9=9D=A2?=
MIME-Version: 1.0
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---
 connection.cpp   | 12 +++++++++++
 connection.h     |  1 +
 item.h           |  1 -
 mainwindow.cpp   | 53 ++++++++++++++++++++++++++++++++++++++++++++++++
 mainwindow.h     |  6 ++++++
 mainwindow.ui    | 13 ++++++++++++
 mygraphicsview.h |  2 +-
 7 files changed, 86 insertions(+), 2 deletions(-)

diff --git a/connection.cpp b/connection.cpp
index 305c18c..7be132f 100644
--- a/connection.cpp
+++ b/connection.cpp
@@ -1,6 +1,7 @@
 #include "connection.h"
 
 #include <QPen>
+#include <QPainter>
 
 Connection::Connection(Item* from, Item::AnchorType fromType,
                        Item* to, Item::AnchorType toType, QGraphicsItem* parent)
@@ -19,3 +20,14 @@ void Connection::updatePosition()
 {
     setLine(QLineF(from_->anchorPos(fromType_), to_->anchorPos(toType_)));
 }
+
+void Connection::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
+{
+    QPen pen = this->pen();
+    if (isSelected()) {
+        pen.setColor(Qt::red); // 选中变红
+        pen.setWidth(3);
+    }
+    painter->setPen(pen);
+    painter->drawLine(line());
+}
diff --git a/connection.h b/connection.h
index e171bfa..868c44f 100644
--- a/connection.h
+++ b/connection.h
@@ -11,6 +11,7 @@ public:
                Item* to, Item::AnchorType toType, QGraphicsItem* parent = nullptr);
 
     void updatePosition();
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) override;
 
     Item *from_, *to_;
     Item::AnchorType fromType_, toType_;
diff --git a/item.h b/item.h
index fa9b2ca..900a31d 100644
--- a/item.h
+++ b/item.h
@@ -35,7 +35,6 @@ protected:
 
 private:
     QString type_;
-    QColor  color_;
     QList<Connection*> connections_;
 };
 
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 83e85f7..a3993c8 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -9,6 +9,7 @@
 #include <QMouseEvent>
 #include <QDropEvent>
 #include <QGraphicsView>
+#include <QMessageBox>
 
 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
@@ -103,3 +104,55 @@ void MainWindow::createComponents()
         it->setData(Qt::UserRole, c.name);
     }
 }
+
+void MainWindow::on_listWidget_currentTextChanged(const QString &text)
+{
+    selectedComponentType = text;
+}
+
+void MainWindow::on_pushButton_clicked()
+{
+    // 1. 找场景中被选中的连线
+       QList<QGraphicsItem*> selectedItems = ui->graphicsView->scene()->selectedItems();
+       Connection* selectedConn = nullptr;
+       for (QGraphicsItem* item : selectedItems) {
+           selectedConn = dynamic_cast<Connection*>(item);
+           if (selectedConn) break;
+       }
+       if (!selectedConn) {
+           QMessageBox::warning(this, "提示", "请先选中一条连线");
+           return;
+       }
+       if (selectedComponentType.isEmpty()) {
+           QMessageBox::warning(this, "提示", "请先在列表中选择要插入的组件");
+           return;
+       }
+
+       // 2. 计算插入点（中点）
+       QLineF lf = selectedConn->line();
+       QPointF insertPos = (lf.p1() + lf.p2()) / 2;
+
+       // 3. 删除原连线
+       Item* from = selectedConn->from_;
+       Item* to = selectedConn->to_;
+       Item::AnchorType fromType = selectedConn->fromType_;
+       Item::AnchorType toType = selectedConn->toType_;
+
+       from->removeConnection(selectedConn);
+       to->removeConnection(selectedConn);
+       ui->graphicsView->scene()->removeItem(selectedConn);
+       delete selectedConn;
+
+       // 4. 插入新元件
+       Item* newItem = new Item(selectedComponentType);
+       newItem->setPos(insertPos);
+       connect(newItem, &Item::requestCopy, ui->graphicsView, &MyGraphicsView::onItemRequestCopy);
+       connect(newItem, &Item::requestDelete, ui->graphicsView, &MyGraphicsView::onItemRequestDelete);
+       ui->graphicsView->scene()->addItem(newItem);
+
+       // 5. 新建两条连线
+       Connection* c1 = new Connection(from, fromType, newItem, Item::Left);
+       ui->graphicsView->scene()->addItem(c1);
+       Connection* c2 = new Connection(newItem, Item::Right, to, toType);
+       ui->graphicsView->scene()->addItem(c2);
+}
diff --git a/mainwindow.h b/mainwindow.h
index d0ae3a3..e473d57 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -19,11 +19,17 @@ public:
 protected:
     bool eventFilter(QObject *obj, QEvent *event) override;
 
+private slots:
+    void on_listWidget_currentTextChanged(const QString &currentText);
+
+    void on_pushButton_clicked();
+
 private:
     void createComponents();
 
     Ui::MainWindow *ui;
     QGraphicsScene *m_scene;
+    QString selectedComponentType;
 };
 
 #endif // MAINWINDOW_H
diff --git a/mainwindow.ui b/mainwindow.ui
index 971f2e0..863f94c 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -37,6 +37,19 @@
      <enum>QGraphicsView::NoDrag</enum>
     </property>
    </widget>
+   <widget class="QPushButton" name="pushButton">
+    <property name="geometry">
+     <rect>
+      <x>30</x>
+      <y>510</y>
+      <width>93</width>
+      <height>28</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>插入</string>
+    </property>
+   </widget>
   </widget>
   <widget class="QMenuBar" name="menubar">
    <property name="geometry">
diff --git a/mygraphicsview.h b/mygraphicsview.h
index 81817a6..420a07f 100644
--- a/mygraphicsview.h
+++ b/mygraphicsview.h
@@ -40,7 +40,7 @@ private:
     };
     static ClipInfo clipboard_;
 
-private slots:
+public slots:
     void onItemRequestCopy(Item*);
     void onItemRequestDelete(Item*);
 };