chore: quick dirty fix for TreeLand

临时为 TreeLand 提供的修改。此提交后续应当回退。修改内容如下：

1. TreeLand 下默认全屏
2. 隐藏切换到窗口模式的按钮

Log:

desktopintegration.cpp

@@ -55,6 +55,11 @@ void DesktopIntegration::launchByDesktopId(const QString &desktopId)
     }
 }
 
+QString DesktopIntegration::environmentVariable(const QString &env)
+{
+    return qEnvironmentVariable(env.toStdString().c_str());
+}
+
 bool DesktopIntegration::appIsCompulsoryForDesktop(const QString &desktopId)
 {
     if (m_compulsoryAppIdList.contains(desktopId)) return true;

desktopintegration.h

@@ -30,6 +30,7 @@ class DesktopIntegration : public QObject
     Q_INVOKABLE static void openShutdownScreen();
     Q_INVOKABLE static void openSystemSettings();
     Q_INVOKABLE static void launchByDesktopId(const QString & desktopId);
+    Q_INVOKABLE static QString environmentVariable(const QString & env);
     Q_INVOKABLE bool appIsCompulsoryForDesktop(const QString & desktopId);
     // TODO: async get wallpaper?
 

launchercontroller.cpp

@@ -28,6 +28,9 @@ LauncherController::LauncherController(QObject *parent)
     QSettings settings(settingPath, QSettings::NativeFormat);
 
     m_currentFrame = settings.value("current_frame", "WindowedFrame").toString();
+    if (qgetenv("DDE_CURRENT_COMPOSITER") == "TreeLand") {
+        m_currentFrame = QStringLiteral("FullscreenFrame");
+    }
 
     m_timer->setInterval(500);
     m_timer->setSingleShot(true);

qml/FullscreenFrame.qml

@@ -119,6 +119,8 @@ Control {
                 ToolButton {
                     id: exitFullscreenBtn
 
+                    visible: (DesktopIntegration.environmentVariable("DDE_CURRENT_COMPOSITER") !== "TreeLand")
+
                     Accessible.name: "Exit fullscreen"
 
                     anchors.right: fullscreenHeader.right