chore: license cleanup, other tweaks

seekableslider.cpp

@@ -1,29 +1,18 @@
-#include "seekableslider.h"
-
-SeekableSlider::SeekableSlider(QWidget *parent) :
-    QSlider(parent)
-{
-    //关闭分段移动
-    setSingleStep(0);
-    setPageStep(0);
-}
-
-//点击Slider即可调节Value
-//只写了横向模式的Slider……
-void SeekableSlider::mousePressEvent(QMouseEvent *event)
-{
-    if (event->buttons() & Qt::LeftButton) {
-        QSlider::mousePressEvent(event);
-        double pos = event->pos().x() / (double)width();
-        setValue(pos * (maximum() - minimum()) + minimum());
-    }
-}
-
-void SeekableSlider::mouseMoveEvent(QMouseEvent *event)
-{
-    if (event->buttons() & Qt::LeftButton) {
-        QSlider::mousePressEvent(event);
-        double pos = event->pos().x() / (double)width();
-        setValue(pos * (maximum() - minimum()) + minimum());
-    }
-}
+// SPDX-FileCopyrightText: 2024 Gary Wang <git@blumia.net>
+//
+// SPDX-License-Identifier: MIT
+
+#include "seekableslider.h"
+
+SeekableSlider::SeekableSlider(QWidget *parent) :
+    QSlider(parent)
+{
+}
+
+void SeekableSlider::mouseReleaseEvent(QMouseEvent *event)
+{
+    double pos = event->pos().x() / (double)width();
+    setValue(pos * (maximum() - minimum()) + minimum());
+    emit sliderReleased();
+    return QSlider::mouseReleaseEvent(event);
+}