Add support for kwin (wayland) (#1393)

lib/linux/kwin-helpers.cpp

@@ -0,0 +1,166 @@
+#include "kwin-helpers.h"
+
+#include "log-helper.hpp"
+
+#include <QDir>
+#include <QFile>
+#include <QFileDevice>
+#include <QTextStream>
+#include <QtDBus/QDBusConnectionInterface>
+#include <QtDBus/QDBusInterface>
+#include <QtDBus/QDBusReply>
+
+namespace advss {
+
+int FocusNotifier::activePID = -1;
+std::string FocusNotifier::activeTitle = {};
+
+int FocusNotifier::getActiveWindowPID()
+{
+	return activePID;
+}
+
+std::string FocusNotifier::getActiveWindowTitle()
+{
+	return activeTitle;
+}
+
+void FocusNotifier::focusChanged(const int pid)
+{
+	activePID = pid;
+}
+
+void FocusNotifier::focusTitle(const QString &title)
+{
+	activeTitle = title.toStdString();
+}
+
+bool isKWinAvailable()
+{
+	const QDBusConnectionInterface *interface =
+		QDBusConnection::sessionBus().interface();
+	if (!interface)
+		return false;
+
+	const QStringList services =
+		interface->registeredServiceNames().value();
+	return services.contains("org.kde.KWin");
+}
+
+bool startKWinScript(QString &scriptObjectPath)
+{
+	const QString scriptPath =
+		"/tmp/AdvancedSceneSwitcher/KWinFocusNotifier.js";
+
+	const QString script =
+		R"(workspace.windowActivated.connect(function(client) {
+if (!client) return;
+if (!client.pid) return;
+if (!client.caption) return;
+
+callDBus(
+    "com.github.AdvancedSceneSwitcher",
+	"/com/github/AdvancedSceneSwitcher",
+	"com.github.AdvancedSceneSwitcher",
+	"focusChanged",
+	client.pid
+);
+callDBus(
+    "com.github.AdvancedSceneSwitcher",
+	"/com/github/AdvancedSceneSwitcher",
+	"com.github.AdvancedSceneSwitcher",
+	"focusTitle",
+	client.caption
+);
+}))";
+
+	if (const QDir dir; !dir.mkpath(QFileInfo(scriptPath).absolutePath())) {
+		blog(LOG_ERROR, "error creating /tmp/AdvancedSceneSwitcher");
+		return false;
+	}
+
+	QFile scriptFile(scriptPath);
+	if (!scriptFile.open(QIODevice::WriteOnly | QIODevice::Text)) {
+		blog(LOG_ERROR,
+		     "error opening KWinFocusNotifier.js for writing");
+		return false;
+	}
+
+	scriptFile.setPermissions(QFileDevice::ReadOwner |
+				  QFileDevice::WriteOwner);
+	QTextStream outputStream(&scriptFile);
+	outputStream << script;
+	scriptFile.close();
+
+	const QDBusConnection bus = QDBusConnection::sessionBus();
+
+	QDBusInterface scriptingIface("org.kde.KWin", "/Scripting",
+				      "org.kde.kwin.Scripting", bus);
+	if (!scriptingIface.isValid()) {
+		return false;
+	}
+
+	const QDBusReply<bool> scriptRunningReply =
+		scriptingIface.call("isScriptLoaded", scriptPath);
+	if (scriptRunningReply.isValid() && scriptRunningReply.value()) {
+		// script already registered and running, don't do it again
+		// this will leave the script running since we do not have
+		// a valid script id anymore, but at the very least this prevents
+		// it from running multiple times
+		return true;
+	}
+
+	const QDBusReply<int> scriptIdReply =
+		scriptingIface.call("loadScript", scriptPath);
+	if (!scriptIdReply.isValid()) {
+		return false;
+	}
+
+	const int scriptId = scriptIdReply.value();
+	scriptObjectPath =
+		QString("/Scripting/Script%1").arg(QString::number(scriptId));
+
+	QDBusInterface scriptRunner("org.kde.KWin", scriptObjectPath,
+				    "org.kde.kwin.Script", bus);
+	if (!scriptRunner.isValid()) {
+		return false;
+	}
+
+	const QDBusReply<void> runReply = scriptRunner.call("run");
+	return runReply.isValid();
+}
+
+bool stopKWinScript(const QString &scriptObjectPath)
+{
+	QDBusInterface scriptRunner("org.kde.KWin", scriptObjectPath,
+				    "org.kde.kwin.Script",
+				    QDBusConnection::sessionBus());
+	if (!scriptRunner.isValid()) {
+		return false;
+	}
+	const QDBusReply<void> stopReply = scriptRunner.call("stop");
+	return stopReply.isValid();
+}
+
+bool registerKWinDBusListener(FocusNotifier *notifier)
+{
+	static const QString serviceName = "com.github.AdvancedSceneSwitcher";
+	static const QString objectPath = "/com/github/AdvancedSceneSwitcher";
+	auto bus = QDBusConnection::sessionBus();
+
+	if (bus.objectRegisteredAt(objectPath)) {
+		// already registered?
+		return true;
+	}
+
+	if (!bus.registerService(serviceName)) {
+		return false;
+	}
+
+	if (!bus.registerObject(objectPath, notifier,
+				QDBusConnection::ExportAllSlots)) {
+		return false;
+	}
+	return true;
+}
+} // namespace advss