Add sync with system toggle switch and remove the deprecated warning.

example/T_Settings.qml

@@ -85,4 +85,38 @@ FluScrollablePage{
 
     }
 
+    FluArea{
+        Layout.fillWidth: true
+        Layout.topMargin: 20
+        height: 80
+        paddings: 10
+
+        ColumnLayout{
+            spacing: 10
+            anchors{
+                top: parent.top
+                left: parent.left
+            }
+
+            FluText{
+                text:lang.dark_mode
+                fontStyle: FluText.BodyStrong
+                Layout.bottomMargin: 4
+            }
+
+            Flow{
+                spacing: 5
+                FluToggleSwitch{
+                    text:lang.sys_dark_mode
+                    selected:FluTheme.dark
+                    onClicked:{
+                        FluTheme.follow_system = true
+                        FluTheme.dark = FluTheme.follow_system
+                    }
+                }
+            }
+        }
+
+    }
+
 }

example/lang/En.cpp

@@ -13,6 +13,7 @@ En::En(QObject *parent)
     theming("Theming");
     media("Media");
     dark_mode("Dark Mode");
+    sys_dark_mode("Sync with system");
     search("Search");
     about("About");
     settings("Settings");

example/lang/Lang.h

@@ -16,6 +16,7 @@ class Lang : public QObject
     Q_PROPERTY_AUTO(QString,theming);
     Q_PROPERTY_AUTO(QString,media);
     Q_PROPERTY_AUTO(QString,dark_mode);
+    Q_PROPERTY_AUTO(QString,sys_dark_mode);
     Q_PROPERTY_AUTO(QString,search);
     Q_PROPERTY_AUTO(QString,about);
     Q_PROPERTY_AUTO(QString,settings);

example/lang/Zh.cpp

@@ -13,6 +13,7 @@ Zh::Zh(QObject *parent)
     theming("主题");
     media("媒体");
     dark_mode("夜间模式");
+    sys_dark_mode("跟随系统");
     search("查找");
     about("关于");
     settings("设置");

src/FluTheme.cpp

@@ -21,4 +21,25 @@ FluTheme::FluTheme(QObject *parent)
     textSize(13);
     nativeText(false);
     frameless(true);
+    if (follow_system()){dark(isDark());}
+    (qobject_cast<QGuiApplication *>(QCoreApplication::instance()))->installEventFilter(this);
+}
+
+bool FluTheme::eventFilter(QObject *obj, QEvent *event)
+{
+    Q_UNUSED(obj);
+    if (event->type() == QEvent::ApplicationPaletteChange)
+    {
+        if (follow_system()){dark(isDark());}
+        event->accept();
+        return true;
+    }
+    return false;
+}
+
+bool FluTheme::isDark()
+{
+    QPalette palette = (qobject_cast<QGuiApplication *>(QCoreApplication::instance()))->palette();
+    QColor color = palette.color(QPalette::Window).rgb();
+    return !(color.red() * 0.2126 + color.green() * 0.7152 + color.blue() * 0.0722 > 255 / 2);
 }

src/FluTheme.h

@@ -11,6 +11,7 @@ class FluTheme : public QObject
     Q_PROPERTY_AUTO(FluColorSet*,primaryColor)
     Q_PROPERTY_AUTO(bool,frameless);
     Q_PROPERTY_AUTO(bool,dark);
+    Q_PROPERTY_AUTO(bool,follow_system);
     Q_PROPERTY_AUTO(bool,nativeText);
     Q_PROPERTY_AUTO(int,textSize);
 public:
@@ -18,7 +19,8 @@ public:
     static FluTheme *getInstance();
 private:
     static FluTheme* m_instance;
-
+    bool eventFilter(QObject *obj, QEvent *event);
+    bool isDark();
 };
 
 #endif // FLUTHEME_H