QT实现点击按钮出现信号

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创建QtGuitest13项目文件

添加一个基于QFrame的类，命名为CircleWidget

在CircleWidget.h中

#ifndef CIRCLEWIDGET_H#define CIRCLEWIDGET_H#include <QFrame>class CircleWidget : public QFrame{Q_OBJECTpublic:CircleWidget(QWidget *parent);~CircleWidget();void my_flag();void Xray_Flag();private:void paintEvent ( QPaintEvent * event );bool m_Flag;bool xray_flag;};#endif // CIRCLEWIDGET_H

在CircleWidget.cpp

#include "CircleWidget.h"

#include <QPainter>CircleWidget::CircleWidget(QWidget *parent): QFrame(parent),m_Flag(false),xray_flag(false){}CircleWidget::~CircleWidget(){}void CircleWidget::my_flag(){m_Flag = true;update();}void CircleWidget::Xray_Flag(){xray_flag = true;update();}void CircleWidget::paintEvent ( QPaintEvent * event ){   if (m_Flag == true){QPainter painter(this);int width = this->width();int height = this->height();painter.setPen(QColor(0x00, 0xFF, 0x00));painter.setBrush(QBrush(QColor(0x00, 0xFF, 0x00)));painter.drawEllipse(height, 0, height, height);}if(m_Flag==false){QPainter painter(this);int width = this->width();int height = this->height();painter.setPen(QColor(0xFF, 0x00, 0x00));painter.setBrush(QBrush(QColor(0xFF, 0x00, 0x00)));painter.drawEllipse(0, 0, height, height);}/*if (xray_flag == true){QPainter painter(this);int width = this->width();int height = this->height();painter.setPen(QColor(0x00, 0xFF, 0x00));painter.setBrush(QBrush(QColor(0x00, 0xFF, 0x00)));painter.drawEllipse(height, 0, height, height);}if (xray_flag == false){QPainter painter(this);int width = this->width();int height = this->height();painter.setPen(QColor(0xFF, 0x00, 0x00));painter.setBrush(QBrush(QColor(0xFF, 0x00, 0x00)));painter.drawEllipse(0, 0, height, height);}*/}

在QtGuitest13.h中

#pragma once#include <QtWidgets/QMainWindow>#include "ui_QtGuitest13.h"class QtGuitest13 : public QMainWindow{Q_OBJECTpublic:QtGuitest13(QWidget *parent = Q_NULLPTR);private slots:int OnDraw1();int OnXray();private:Ui::QtGuitest13Class ui;};

对应的cpp中

#include "QtGuitest13.h"QtGuitest13::QtGuitest13(QWidget *parent): QMainWindow(parent){ui.setupUi(this);connect(ui.btnDraw,SIGNAL(clicked()),this,SLOT(OnDraw1()));connect(ui.btnXray, SIGNAL(clicked()), this, SLOT(OnXray()));}int QtGuitest13::OnDraw1(){ui.frame->my_flag();return 0;}int QtGuitest13::OnXray(){ui.frame_2->Xray_Flag();return 0;}

main.cpp中

#include "QtGuitest13.h"#include <QtWidgets/QApplication>#include "CircleWidget.h"#include "CircleWidget0.h"int main(int argc, char *argv[]){QApplication a(argc, argv);//QtGuitest13 w;CircleWidget0 w(NULL);w.show();return a.exec();}

.ui 中

拖入Frame框架然后promote刚刚自己写的类注意大小写

主要是QtGuitest13.cpp中的最后的那句ui.frame->(***)将Button信号和画图信号进行关联实现点击Button后才有动作

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