optmize start stop

ui/widget/MessageBoxTimer.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <QMessageBox>
+#include <QTimer>
+
+class MessageBoxTimer : public QTimer {
+public:
+    QMessageBox *msgbox = nullptr;
+    bool showed = false;
+
+    explicit MessageBoxTimer(QObject *parent, QMessageBox *msgbox, int delayMs) : QTimer(parent) {
+        connect(this, &QTimer::timeout, this, &MessageBoxTimer::timeoutFunc, Qt::ConnectionType::QueuedConnection);
+        this->msgbox = msgbox;
+        setSingleShot(true);
+        setInterval(delayMs);
+        start();
+    };
+
+    void cancel() {
+        QTimer::stop();
+        if (msgbox != nullptr && showed) {
+            msgbox->reject(); // return the timeoutFunc
+        }
+    };
+
+private:
+    void timeoutFunc() {
+        if (msgbox == nullptr) return;
+        showed = true;
+        msgbox->exec();
+        msgbox = nullptr;
+    }
+};