feat: 使用dbus支持kde的暗色模式

src/backend/ThemeChecker.cpp

@@ -0,0 +1,44 @@
+#include "ThemeChecker.h"
+#include <QTimer>
+#include <QProcess>
+#include <QDebug>
+
+ThemeChecker::ThemeChecker(QObject *parent) : QObject(parent), lastColorSchema(-1) {
+    timer = new QTimer(this);
+    connect(timer, SIGNAL(timeout()), this, SLOT(checkThemeChange()));
+    timer->start(1000);
+}
+
+void ThemeChecker::checkThemeChange() {
+
+
+    QProcess process;
+    QStringList parameters;
+    parameters << "-c" << "dbus-send --session --print-reply=literal --reply-timeout=1000 --dest=org.freedesktop.portal.Desktop /org/freedesktop/portal/desktop org.freedesktop.portal.Settings.Read string:'org.freedesktop.appearance' string:'color-scheme'";
+    process.start("/bin/sh", parameters);
+
+    if (process.waitForFinished(-1)) {
+        QString errorOutput = QString(process.readAllStandardError()).trimmed();
+        if (!errorOutput.isEmpty()) {
+            qWarning() << "检测到DBus错误:" << errorOutput;
+            return;
+        }
+
+        QString output = QString(process.readAll()).trimmed();
+        int systemColorSchema = output.right(1).toInt();
+
+        if(systemColorSchema != lastColorSchema) {
+            lastColorSchema = systemColorSchema;
+            qDebug() << "主题已更改，新的主题是：" << systemColorSchema;
+            if(systemColorSchema == 1){
+                emit themeChanged(true);
+            }
+            else if(systemColorSchema == 0 || systemColorSchema == 2){
+                emit themeChanged(false);
+            }
+        }
+    } else {
+        qWarning() << "DBus调用未能完成";
+    }
+}
+

src/backend/ThemeChecker.h

@@ -0,0 +1,26 @@
+#ifndef THEMECHECKER_H
+#define THEMECHECKER_H
+
+#include <QObject>
+#include <QTimer>
+
+
+class ThemeChecker : public QObject
+{
+    Q_OBJECT
+public:
+    explicit ThemeChecker(QObject *parent = nullptr);
+
+signals:
+    void themeChanged(bool isDark);
+
+public slots:
+    void checkThemeChange();
+
+
+private:
+    int lastColorSchema;
+    QTimer *timer;
+};
+
+#endif // THEMECHECKER_H