fix: Main interface does not gray out when losing focus

log: In the DialogWindow, when set to WindowModal, the transientParent is automatically set to Qt.application.activeWindow. Upon display, raise() and requestActivate() are called to ensure the main window correctly enters a grayed-out state.

pms: bug-336201

Author: JWWTSL

qt6/src/qml/DialogWindow.qml

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2021 - 2022 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2021 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -33,6 +33,9 @@ Window {
     property real leftPadding: DS.Style.dialogWindow.contentHMargin
     property real rightPadding: DS.Style.dialogWindow.contentHMargin
 
+    property var transientParentWindow: null
+    transientParent: transientParentWindow
+
     Item {
         id: content
         palette: control.active ? D.DTK.palette : D.DTK.inactivePalette
@@ -60,6 +63,30 @@ Window {
         }
     }
 
+    function updateTransientParent() {
+        if (control.modality !== Qt.WindowModal)
+            return
+        if (!transientParentWindow || transientParentWindow === control) {
+            var candidate = Qt.application.activeWindow
+            if (candidate && candidate !== control)
+                transientParentWindow = candidate
+        }
+    }
+
+    Component.onCompleted: {
+        updateTransientParent()
+    }
+
+    onVisibleChanged: {
+        if (!control.visible)
+            return
+        updateTransientParent()
+        Qt.callLater(function () {
+            control.raise()
+            control.requestActivate()
+        })
+    }
+
     onClosing: function(close) {
         // close can't reset sub control's hovered state. pms Bug:168405
         // if we need to close, we can add closing handler to set `close.acceped = true`