feat(Windows): open window will be able to use system animation

app/framelesswindow.cpp

@@ -11,6 +11,22 @@
 #include <QVBoxLayout>
 #include <QWindow>
 
+#ifdef Q_OS_WIN
+#include "windows.h"
+void fixWindowStyle(QWidget * that)
+{
+    HWND hwnd = (HWND)that->winId();
+
+    LONG style = GetWindowLong(hwnd, GWL_STYLE);
+    style |= WS_THICKFRAME | WS_CAPTION | WS_MAXIMIZEBOX | WS_MINIMIZEBOX | WS_SYSMENU;
+    SetWindowLong(hwnd, GWL_STYLE, style);
+
+    SetWindowPos(hwnd, nullptr, 0, 0, 0, 0,
+                 SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE |
+                     SWP_NOZORDER | SWP_NOACTIVATE);
+}
+#endif
+
 FramelessWindow::FramelessWindow(QWidget *parent)
     : QWidget(parent)
     , m_centralLayout(new QVBoxLayout(this))
@@ -41,6 +57,14 @@ void FramelessWindow::installResizeCapture(QObject* widget)
     widget->installEventFilter(this);
 }
 
+void FramelessWindow::showEvent(QShowEvent *event)
+{
+#ifdef Q_OS_WIN
+    fixWindowStyle(this);
+#endif // Q_OS_WIN
+    return QWidget::showEvent(event);
+}
+
 bool FramelessWindow::eventFilter(QObject* o, QEvent* e)
 {
     switch (e->type()) {

app/framelesswindow.h

@@ -20,6 +20,9 @@ public:
     void setCentralWidget(QWidget * widget);
     void installResizeCapture(QObject* widget);
 
+protected slots:
+    void showEvent(QShowEvent *event) override;
+
 protected:
     bool eventFilter(QObject *o, QEvent *e) override;
     bool mouseHover(QHoverEvent* event, QWidget* wg);