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Qt中使用回调函数
lesliefish · Jun 21, 2018 · bd62e2a · bd62e2a
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diff --git a/.gitattributes b/.gitattributes
@@ -0,0 +1,63 @@
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+# file extensions to fail to load in VS. An alternative would be to treat
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+# intervention with every merge. To do so, just uncomment the entries below
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diff --git a/.gitignore b/.gitignore
@@ -48,3 +48,7 @@ Core/QGraphicsview_test/.vs/QGraphicsview_test/v14/.suo
 Core/QGraphicsview_test/QGraphicsview_test/GeneratedFiles/Debug/moc_QGraphicsviewTest.cpp
 Core/QGraphicsview_test/QGraphicsview_test/GeneratedFiles/qrc_QGraphicsviewTest.cpp
 Core/QGraphicsview_test/QGraphicsview_test.VC.db
+Project/QtGuiApplication/.vs/QtGuiApplication/v15/Browse.VC.db
+Project/QtGuiApplication/.vs/QtGuiApplication/v15/.suo
+Project/QtGuiApplication/.vs/QtGuiApplication/v15/ipch/AutoPCH/6b0420b2d8bc96cf/MAIN.ipch
+*.ipch
diff --git a/Project/QtGuiApplication/CallBackTest/CallBackTest.qrc b/Project/QtGuiApplication/CallBackTest/CallBackTest.qrc
@@ -0,0 +1,4 @@
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+    <qresource prefix="CallBackTest">
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diff --git a/Project/QtGuiApplication/CallBackTest/CallBackTest.vcxproj b/Project/QtGuiApplication/CallBackTest/CallBackTest.vcxproj
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+    <ClCompile Include="MainWindow.cpp" />
+    <ClCompile Include="Square.cpp" />
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diff --git a/Project/QtGuiApplication/CallBackTest/MainWindow.cpp b/Project/QtGuiApplication/CallBackTest/MainWindow.cpp
@@ -0,0 +1,45 @@
+#include "MainWindow.h"
+#include "ui_MainWindow.h"
+
+QLineEdit * MainWindow::line1;
+QLineEdit * MainWindow::line2;
+
+MainWindow::MainWindow(QWidget *parent)
+    : QWidget(parent)
+{
+    ui = new Ui::MainWindow();
+    ui->setupUi(this);
+
+    // 初始化QLineEdit
+    line1 = new QLineEdit();
+    line2 = new QLineEdit();
+
+    // 把两个line 放进gridLayout
+    ui->gridLayout->addWidget(line1, 0, 1);
+    ui->gridLayout->addWidget(line2, 0, 2);
+
+    m_scene = new QGraphicsScene();       // 初始化图形场景
+    ui->graphicsView->setScene(m_scene);  // 设置场景到 graphicsView
+    m_scene->setSceneRect(0, 0, 300, 300);
+    m_square = new Square();
+    m_square->setCallbackFunc(getPosition);   // 将getPosition设置回调  接收m_square传入的数据
+    m_square->setPos(100, 100);
+    m_scene->addItem(m_square);
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
+/** 
+ * @fn     MainWindow::getPosition
+ * @brief  回调函数接收正方形位置 写入两个lineEdit
+ * @param  QPointF point
+ * @return void
+ */
+void MainWindow::getPosition(QPointF point)
+{
+    line1->setText(QString::number(point.x()));
+    line2->setText(QString::number(point.y()));
+}
diff --git a/Project/QtGuiApplication/CallBackTest/MainWindow.h b/Project/QtGuiApplication/CallBackTest/MainWindow.h
@@ -0,0 +1,28 @@
+#pragma once
+
+#include <QWidget>
+#include <QGraphicsScene>
+#include <QLineEdit>
+#include "Square.h"
+namespace Ui { class MainWindow; };
+
+class MainWindow : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = Q_NULLPTR);
+    ~MainWindow();
+
+private:
+    Ui::MainWindow* ui;
+
+    QGraphicsScene* m_scene;
+    Square *m_square;         // We declare the square, which will transmit the callback function
+    static QLineEdit *line1;    // We declare a static QLineEdit, which will run the callback function
+    static QLineEdit *line2;    // We declare a static QLineEdit, which will run the callback function
+
+private:
+    // ÉùÃ÷Ò»¸ö»Øµ÷º¯Êý
+    static void getPosition(QPointF point);
+};
diff --git a/Project/QtGuiApplication/CallBackTest/MainWindow.ui b/Project/QtGuiApplication/CallBackTest/MainWindow.ui
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QWidget" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout_2">
+   <item row="0" column="0">
+    <layout class="QVBoxLayout" name="verticalLayout">
+     <item>
+      <layout class="QGridLayout" name="gridLayout"/>
+     </item>
+     <item>
+      <widget class="QGraphicsView" name="graphicsView"/>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/Project/QtGuiApplication/CallBackTest/Square.cpp b/Project/QtGuiApplication/CallBackTest/Square.cpp
@@ -0,0 +1,57 @@
+#include "Square.h"
+#include <windows.h>
+
+Square::Square(QObject *parent)
+    : QObject(parent), QGraphicsItem()
+{
+    m_timer = new QTimer();
+    connect(m_timer, &QTimer::timeout, this, &Square::slotTimer);
+    m_timer->start(1000 / 33);
+}
+
+Square::~Square()
+{
+}
+
+void Square::setCallbackFunc(void(*func) (QPointF point))
+{
+    m_callbackFunc = func;
+}
+
+QRectF Square::boundingRect() const
+{
+    return QRectF(-15, -15, 30, 30);
+}
+
+void Square::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    painter->setPen(Qt::black);
+    painter->setBrush(Qt::green);
+    painter->drawRect(-15, -15, 30, 30);
+
+    Q_UNUSED(option);
+    Q_UNUSED(widget);
+}
+
+void Square::slotTimer()
+{
+    // 根据按钮触发情况移动正方形
+    if (GetAsyncKeyState('A')) 
+    {
+        this->setX(this->x() - 2);
+    }
+    if (GetAsyncKeyState('D')) 
+    {
+        this->setX(this->x() + 2);
+    }
+    if (GetAsyncKeyState('W')) 
+    {
+        this->setY(this->y() - 2);
+    }
+    if (GetAsyncKeyState('S')) 
+    {
+        this->setY(this->y() + 2);
+    }
+    // 调用回调函数传递正方形位置
+    m_callbackFunc(this->pos());
+}