Qt學習: QTimerEvent定時器事件的處理程序代碼示例
阿新 • • 發佈:2017-10-13
軟件 window 編程
重要函數:
1.int startTimer(int); //設置定時器,返回一個ld.
2.int event->timerld(); //返回當前的ld.
3.void killTimer(int); //停止定時器.
首先從Qt設計師中拖拽出三個按鈕,由於只是演示定時器事件的使用,所以就沒有布局的需要了.
以下是”c.cpp”的代碼:
#include "c.h"c::c(QWidget *parent) : QMainWindow(parent) { ui.setupUi(this); //連接信號與槽. connect(ui.startButton, SIGNAL(clicked()), this, SLOT(startTimerSlot())); connect(ui.stopButton, SIGNAL(clicked()), this, SLOT(stopTimerSlot())); } c::~c() { }void c::timerEvent(QTimerEvent*event) { //判斷當前定時器對應的是哪個ld. if (event->timerId() == this->m_lamp) { if (this->m_lampStatus == false) { //設置按鈕的圖標. ui.toolButton->setIcon(QIcon("Icons/lamp.png")); this->m_lampStatus = true; } else { ui.toolButton->setIcon(QIcon("Icons/space.png")); this->m_lampStatus = false; } } }void c::startTimerSlot() { //設置定時器,返回一個timerld.註意單位為毫秒,1000毫秒等於1秒. this->m_lamp = this->startTimer(1000); }void c::stopTimerSlot() { //停止定時器. this->killTimer(this->m_lamp); }12345678910111213141516171819202122232425262728293031323334353637383940414243444546
以下是”c.h”的代碼:
#ifndef C_H#define C_H#include <QtWidgets/QMainWindow>#include "ui_c.h"#include <QLabel>#include <QTimerEvent>class c : public QMainWindow { Q_OBJECTpublic: c(QWidget *parent = 0); ~c();protected: //這是一個虛函數,從QEvent繼承而來. void timerEvent(QTimerEvent*event);private slots: void startTimerSlot(); void stopTimerSlot();private: Ui::cClass ui; int m_lamp; bool m_lampStatus = false; };#endif // C_H12345678910111213141516171819202122232425262728293031
最後是”main.cpp”的代碼:
#include "c.h"#include <QtWidgets/QApplication>int main(int argc, char *argv[]) { QApplication a(argc, argv); c w; w.show(); return a.exec(); }
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Qt學習: QTimerEvent定時器事件的處理程序代碼示例