Use KWayland protocol to close the active window

As a nice side-effect this allows us to enable/disable the close button
depending on whether we have a window to close.

containments/taskpanel/package/contents/code/close.js

@@ -1,2 +0,0 @@
-
-workspace.activeClient.closeWindow();

containments/taskpanel/package/contents/ui/main.qml

@@ -73,7 +73,8 @@ PlasmaCore.ColorScope {
             width: parent.width/3
             anchors.right: parent.right
             iconSource: "window-close"
-            onClicked: plasmoid.nativeInterface.executeScript("close");
+            enabled: plasmoid.nativeInterface.hasCloseableActiveWindow;
+            onClicked: plasmoid.nativeInterface.closeActiveWindow();
         }
     }
 }

containments/taskpanel/taskpanel.cpp

@@ -21,10 +21,6 @@
 
 #include <QtQml>
 #include <QDebug>
-#include <QDBusMessage>
-#include <QDBusConnection>
-#include <QDBusPendingCallWatcher>
-#include <QDBusPendingReply>
 
 #include <Plasma/Package>
 
@@ -47,35 +43,6 @@ TaskPanel::~TaskPanel()
 {
 }
 
-void TaskPanel::executeScript(const QString &script)
-{
-    //Plasma::Package p = 
-    QDBusMessage message = QDBusMessage::createMethodCall(s_kwinService, "/Scripting", QString(), "loadScript");
-    QList<QVariant> arguments;
-    arguments << QVariant(package().filePath("scripts", script + ".js"));
-    message.setArguments(arguments);
-    QDBusPendingReply<void> asyncCall = QDBusConnection::sessionBus().asyncCall(message);
-    
-    QDBusPendingCallWatcher *watcher = new QDBusPendingCallWatcher(asyncCall, this);
-    QObject::connect(watcher, SIGNAL(finished(QDBusPendingCallWatcher*)),
-          this, SLOT(loadScriptFinishedSlot(QDBusPendingCallWatcher*)));
-}
-
-void TaskPanel::loadScriptFinishedSlot(QDBusPendingCallWatcher *watcher)
-{
-    QDBusMessage reply = watcher->reply();
-    if (reply.type() == QDBusMessage::ErrorMessage) {
-        qWarning() << reply.errorMessage();
-    } else {
-        const int id = reply.arguments().first().toInt();
-        QDBusConnection::sessionBus().connect(s_kwinService, "/" + QString::number(id), QString(), "print", this, SLOT(print(QString)));
-        QDBusConnection::sessionBus().connect(s_kwinService, "/" + QString::number(id), QString(), "printError", this, SLOT(print(QString)));
-        QDBusMessage message = QDBusMessage::createMethodCall(s_kwinService, "/" + QString::number(id), QString(), "run");
-        //fire blindly the call for now
-        QDBusConnection::sessionBus().asyncCall(message);
-    }
-}
-
 void TaskPanel::requestShowingDesktop(bool showingDesktop)
 {
     if (!m_windowManagement) {
@@ -108,11 +75,35 @@ void TaskPanel::initWayland()
                     emit showingDesktopChanged(m_showingDesktop);
                 }
             );
+            connect(m_windowManagement, &PlasmaWindowManagement::activeWindowChanged, this, &TaskPanel::updateActiveWindow);
+            updateActiveWindow();
         }
     );
     registry->setup();
 }
 
+void TaskPanel::updateActiveWindow()
+{
+    if (!m_windowManagement) {
+        return;
+    }
+    m_activeWindow = m_windowManagement->activeWindow();
+    // TODO: connect to closeableChanged, not needed right now as KWin doesn't provide this changeable
+    emit hasCloseableActiveWindowChanged();
+}
+
+bool TaskPanel::hasCloseableActiveWindow() const
+{
+    return m_activeWindow && m_activeWindow->isCloseable();
+}
+
+void TaskPanel::closeActiveWindow()
+{
+    if (m_activeWindow) {
+        m_activeWindow->requestClose();
+    }
+}
+
 K_EXPORT_PLASMA_APPLET_WITH_JSON(taskpanel, TaskPanel, "metadata.json")
 
 #include "taskpanel.moc"

containments/taskpanel/taskpanel.h

@@ -24,13 +24,12 @@
 
 #include <Plasma/Containment>
 
-class QDBusPendingCallWatcher;
-
 namespace KWayland
 {
 namespace Client
 {
 class PlasmaWindowManagement;
+class PlasmaWindow;
 }
 }
 
@@ -38,28 +37,31 @@ class TaskPanel : public Plasma::Containment
 {
     Q_OBJECT
     Q_PROPERTY(bool showDesktop READ isShowingDesktop WRITE requestShowingDesktop NOTIFY showingDesktopChanged)
+    Q_PROPERTY(bool hasCloseableActiveWindow READ hasCloseableActiveWindow NOTIFY hasCloseableActiveWindowChanged)
 
 public:
     TaskPanel( QObject *parent, const QVariantList &args );
     ~TaskPanel();
 
-    Q_INVOKABLE void executeScript(const QString &script);
+    Q_INVOKABLE void closeActiveWindow();
 
     bool isShowingDesktop() const {
         return m_showingDesktop;
     }
     void requestShowingDesktop(bool showingDesktop);
 
+    bool hasCloseableActiveWindow() const;
+
 Q_SIGNALS:
     void showingDesktopChanged(bool);
-
+    void hasCloseableActiveWindowChanged();
-private Q_SLOTS:
-    void loadScriptFinishedSlot(QDBusPendingCallWatcher *watcher);
 
 private:
     void initWayland();
+    void updateActiveWindow();
     bool m_showingDesktop;
     KWayland::Client::PlasmaWindowManagement *m_windowManagement;
+    KWayland::Client::PlasmaWindow *m_activeWindow = nullptr;
 
 };