信号与槽

信号和槽：

让按钮按下有反应，借助信号和槽；相当于“软件中断”，借助Connect()处理，建立链接关系;

connect(&b1 , &QPushButton::pressed, this ,&MainWidget::close);

参数作用&b1“信号发出者”， 指针类型&QPushButton::pressed“处理的信号”， 类名：：信号this“信号接收者”&MainWidget::close"槽函数、信号处理函数 "，&接收的类名：：槽函数名字 （此处为常函数） #mermaid-svg-5qZ0JedBmuPdjypo .label{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);fill:#333;color:#333}#mermaid-svg-5qZ0JedBmuPdjypo .label text{fill:#333}#mermaid-svg-5qZ0JedBmuPdjypo .node rect,#mermaid-svg-5qZ0JedBmuPdjypo .node circle,#mermaid-svg-5qZ0JedBmuPdjypo .node ellipse,#mermaid-svg-5qZ0JedBmuPdjypo .node polygon,#mermaid-svg-5qZ0JedBmuPdjypo .node path{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-5qZ0JedBmuPdjypo .node .label{text-align:center;fill:#333}#mermaid-svg-5qZ0JedBmuPdjypo .node.clickable{cursor:pointer}#mermaid-svg-5qZ0JedBmuPdjypo .arrowheadPath{fill:#333}#mermaid-svg-5qZ0JedBmuPdjypo .edgePath .path{stroke:#333;stroke-width:1.5px}#mermaid-svg-5qZ0JedBmuPdjypo .flowchart-link{stroke:#333;fill:none}#mermaid-svg-5qZ0JedBmuPdjypo .edgeLabel{background-color:#e8e8e8;text-align:center}#mermaid-svg-5qZ0JedBmuPdjypo .edgeLabel rect{opacity:0.9}#mermaid-svg-5qZ0JedBmuPdjypo .edgeLabel span{color:#333}#mermaid-svg-5qZ0JedBmuPdjypo .cluster rect{fill:#ffffde;stroke:#aa3;stroke-width:1px}#mermaid-svg-5qZ0JedBmuPdjypo .cluster text{fill:#333}#mermaid-svg-5qZ0JedBmuPdjypo div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);font-size:12px;background:#ffffde;border:1px solid #aa3;border-radius:2px;pointer-events:none;z-index:100}#mermaid-svg-5qZ0JedBmuPdjypo .actor{stroke:#ccf;fill:#ECECFF}#mermaid-svg-5qZ0JedBmuPdjypo text.actor>tspan{fill:#000;stroke:none}#mermaid-svg-5qZ0JedBmuPdjypo .actor-line{stroke:grey}#mermaid-svg-5qZ0JedBmuPdjypo .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333}#mermaid-svg-5qZ0JedBmuPdjypo .messageLine1{stroke-width:1.5;stroke-dasharray:2, 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#compositionEnd{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-5qZ0JedBmuPdjypo #aggregationStart{fill:#ECECFF;stroke:#9370db;stroke-width:1}#mermaid-svg-5qZ0JedBmuPdjypo #aggregationEnd{fill:#ECECFF;stroke:#9370db;stroke-width:1}#mermaid-svg-5qZ0JedBmuPdjypo #dependencyStart{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-5qZ0JedBmuPdjypo #dependencyEnd{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-5qZ0JedBmuPdjypo #extensionStart{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-5qZ0JedBmuPdjypo #extensionEnd{fill:#9370db;stroke:#9370db;stroke-width:1}#mermaid-svg-5qZ0JedBmuPdjypo .commit-id,#mermaid-svg-5qZ0JedBmuPdjypo .commit-msg,#mermaid-svg-5qZ0JedBmuPdjypo .branch-label{fill:lightgrey;color:lightgrey;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-5qZ0JedBmuPdjypo .pieTitleText{text-anchor:middle;font-size:25px;fill:#000;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-5qZ0JedBmuPdjypo .slice{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-5qZ0JedBmuPdjypo g.stateGroup text{fill:#9370db;stroke:none;font-size:10px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-5qZ0JedBmuPdjypo g.stateGroup text{fill:#9370db;fill:#333;stroke:none;font-size:10px}#mermaid-svg-5qZ0JedBmuPdjypo g.statediagram-cluster .cluster-label text{fill:#333}#mermaid-svg-5qZ0JedBmuPdjypo g.stateGroup .state-title{font-weight:bolder;fill:#000}#mermaid-svg-5qZ0JedBmuPdjypo g.stateGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-5qZ0JedBmuPdjypo g.stateGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-5qZ0JedBmuPdjypo .transition{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-5qZ0JedBmuPdjypo .stateGroup .composit{fill:white;border-bottom:1px}#mermaid-svg-5qZ0JedBmuPdjypo .stateGroup .alt-composit{fill:#e0e0e0;border-bottom:1px}#mermaid-svg-5qZ0JedBmuPdjypo .state-note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-5qZ0JedBmuPdjypo .state-note text{fill:black;stroke:none;font-size:10px}#mermaid-svg-5qZ0JedBmuPdjypo .stateLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.7}#mermaid-svg-5qZ0JedBmuPdjypo .edgeLabel text{fill:#333}#mermaid-svg-5qZ0JedBmuPdjypo .stateLabel text{fill:#000;font-size:10px;font-weight:bold;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-5qZ0JedBmuPdjypo .node circle.state-start{fill:black;stroke:black}#mermaid-svg-5qZ0JedBmuPdjypo .node circle.state-end{fill:black;stroke:white;stroke-width:1.5}#mermaid-svg-5qZ0JedBmuPdjypo #statediagram-barbEnd{fill:#9370db}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-cluster rect{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-cluster rect.outer{rx:5px;ry:5px}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-state .divider{stroke:#9370db}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-state .title-state{rx:5px;ry:5px}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-cluster.statediagram-cluster .inner{fill:white}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-5qZ0JedBmuPdjypo .note-edge{stroke-dasharray:5}#mermaid-svg-5qZ0JedBmuPdjypo .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-5qZ0JedBmuPdjypo .error-icon{fill:#522}#mermaid-svg-5qZ0JedBmuPdjypo .error-text{fill:#522;stroke:#522}#mermaid-svg-5qZ0JedBmuPdjypo .edge-thickness-normal{stroke-width:2px}#mermaid-svg-5qZ0JedBmuPdjypo .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-5qZ0JedBmuPdjypo .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-5qZ0JedBmuPdjypo .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-5qZ0JedBmuPdjypo .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-5qZ0JedBmuPdjypo .marker{fill:#333}#mermaid-svg-5qZ0JedBmuPdjypo .marker.cross{stroke:#333} :root { --mermaid-font-family: "trebuchet ms", verdana, arial;} #mermaid-svg-5qZ0JedBmuPdjypo { color: rgba(0, 0, 0, 0.75); font: ; } 链接 调用 按下按钮b1 发送信号 如pressed,click 感兴趣对象 窗口this close函数

自定义槽

任意成员函数，普通成员函数，静态函数

注意： 1.在头文件.h 声明 2.在窗口构造函数里，窗口.cpp 内部，声明槽函数 3.须与信号一致，即参数一致，没有返回值 4.注意类型 是否为指针

#include "mainwidget.h" #include <QPushButton> #include "ui_mainwidget.h" #include <QString> #include <QChar> MainWidget::MainWidget(QWidget *parent) : QWidget(parent), ui(new Ui::MainWidget) { ui->setupUi(this); b1.setParent(this); b1.setText("Confirm"); b1.move(100, 100); b2 = new QPushButton(this); b2->setText("a"); b2->move(200, 100); connect(&b1, &QPushButton::released, this ,&MainWidget::close); //调用常函数 connect(b2, &QPushButton::pressed, this,&MainWidget::mySlot); //调用，自定义槽函数 /* 自定义槽函数：切换按钮 */ void MainWidget::mySlot() { QChar *key = new QChar[1]; key = b2->text().data(); char target = key[0].toLatin1(); switch (target){ case 'a': b2->setText("z"); break; case 'z': b2->setText("a"); break; } } MainWidget::~MainWidget() { delete ui; } #mermaid-svg-fvtPjf0EH1fhLPc2 .label{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);fill:#333;color:#333}#mermaid-svg-fvtPjf0EH1fhLPc2 .label text{fill:#333}#mermaid-svg-fvtPjf0EH1fhLPc2 .node 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#mermaid-svg-fvtPjf0EH1fhLPc2 { color: rgba(0, 0, 0, 0.75); font: ; } 链接 调用 connect监听按钮 按钮::信号 此对象 此类::槽函数

子窗口

创建子窗口： 1、新建一个类：subWidget.h 和 subWidget.cpp 2、在父窗口头文件中：加入成员子窗口subWidget.h和private: subWidget w 3.在子窗口指定父对象（注：父对象show()会一同显示其所有子对象）

自定义信号

要在 signals关键字下声明：有参数，无返回不用定义，只需声明 Signals: void mySignal();使用：emit XXX(); //subWidget.h 里声明信号 signals: void mySignal(); //subWidget.cpp 里一个槽函数:发送信号 void SubWidget::sendSlot() { emit mySignal(); }