From 203274a522c73e3444a0ea641e8fa0c28ecbb306 Mon Sep 17 00:00:00 2001
From: Gary Wang <wzc782970009@gmail.com>
Date: Fri, 16 Oct 2020 01:00:11 +0800
Subject: [PATCH] feat: try using QWindow::startSystemMove() under Qt 5.15+

---
 mainwindow.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mainwindow.cpp b/mainwindow.cpp
index 8479c1c..28be67a 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -22,6 +22,7 @@
 #include <QCollator>
 #include <QClipboard>
 #include <QMimeData>
+#include <QWindow>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -339,7 +340,13 @@ void MainWindow::mousePressEvent(QMouseEvent *event)
 void MainWindow::mouseMoveEvent(QMouseEvent *event)
 {
     if (event->buttons() & Qt::LeftButton && m_clickedOnWindow && !isMaximized()) {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
+        if (!window()->windowHandle()->startSystemMove()) {
+            move(event->globalPos() - m_oldMousePos);
+        }
+#else
         move(event->globalPos() - m_oldMousePos);
+#endif // QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
         event->accept();
     }