更新

countdown.cpp

@@ -0,0 +1,43 @@
+#include "countdown.h"
+
+countDown::countDown(QObject *parent) : QObject(parent)
+{
+    timer=new QTimer(this);
+    connect(timer,&QTimer::timeout,this,&countDown::refresh);
+}
+
+void countDown::refresh()
+{
+    if(ms)
+    {
+        ms--;
+        if(!ms) emit ended();//计时结束,触发结束信号,写在这里是为了让声音和画面同步
+    }
+    else
+    {
+        if(timer->isActive())timer->stop();
+    }
+    emit refreshed();
+}
+
+void countDown::setTime(int t)//弃坑,写不来
+{
+    mem=ms=t;
+    emit setted();
+}
+void countDown::reset()
+{
+    ms=mem;
+    refresh();
+    emit setted();
+}
+void countDown::start()
+{
+    emit refreshed();
+    timer->start(1000);
+}
+void countDown::stop()
+{
+    emit refreshed();
+    if(timer->isActive())timer->stop();
+}