Simplify Alternatives Dialog code

Summary: Replace QObject::sender() and tracking objects in a list with a simple lambda.

Test Plan: Opened and closed dialog.

Reviewers: #plasma, mart

Reviewed By: #plasma, mart

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D6615

shell/shellcorona.cpp

@@ -38,6 +38,8 @@
 #include <klocalizedstring.h>
 #include <Plasma/Package>
 #include <Plasma/PluginLoader>
+#include <PlasmaQuick/Dialog>
+
 #include <kactivities/controller.h>
 #include <kactivities/consumer.h>
 #include <ksycoca.h>
@@ -820,42 +822,26 @@ void ShellCorona::showAlternativesForApplet(Plasma::Applet *applet)
     AlternativesHelper *helper = new AlternativesHelper(applet, qmlObj);
     qmlObj->rootContext()->setContextProperty(QStringLiteral("alternativesHelper"), helper);
 
-    m_alternativesObjects << qmlObj;
     qmlObj->completeInitialization();
-    connect(qmlObj->rootObject(), SIGNAL(visibleChanged(bool)),
-            this, SLOT(alternativesVisibilityChanged(bool)));
 
-    connect(applet, &Plasma::Applet::destroyedChanged, this, [this, qmlObj] (bool destroyed) {
+    auto dialog = qobject_cast<PlasmaQuick::Dialog*>(qmlObj->rootObject());
+    if (!dialog) {
+        qWarning() << "Alternatives UI does not inherit from Dialog";
+        delete qmlObj;
+        return;
+    }
+    connect(applet, &Plasma::Applet::destroyedChanged, qmlObj, [qmlObj] (bool destroyed) {
         if (!destroyed) {
             return;
         }
-        QMutableListIterator<KDeclarative::QmlObject *> it(m_alternativesObjects);
-        while (it.hasNext()) {
-            KDeclarative::QmlObject *obj = it.next();
-            if (obj == qmlObj) {
-                it.remove();
-                obj->deleteLater();
-            }
-        }
+        qmlObj->deleteLater();
     });
-}
-
-void ShellCorona::alternativesVisibilityChanged(bool visible)
-{
-    if (visible) {
-        return;
-    }
-
-    QObject *root = sender();
-
-    QMutableListIterator<KDeclarative::QmlObject *> it(m_alternativesObjects);
-    while (it.hasNext()) {
-        KDeclarative::QmlObject *obj = it.next();
-        if (obj->rootObject() == root) {
-            it.remove();
-            obj->deleteLater();
+    connect(dialog, &PlasmaQuick::Dialog::visibleChanged, qmlObj, [qmlObj](bool visible) {
+        if (visible) {
+            return;
         }
-    }
+        qmlObj->deleteLater();
+    });
 }
 
 void ShellCorona::unload()

shell/shellcorona.h

@@ -202,7 +202,6 @@ private Q_SLOTS:
     void panelContainmentDestroyed(QObject* cont);
     void desktopContainmentDestroyed(QObject*);
     void showOpenGLNotCompatibleWarning();
-    void alternativesVisibilityChanged(bool visible);
     void interactiveConsoleVisibilityChanged(bool visible);
     void screenRemoved(QScreen* screen);
 
@@ -242,7 +241,6 @@ private:
     QMenu *m_addPanelsMenu;
     KPackage::Package m_lookAndFeelPackage;
     QSet<QScreen*> m_redundantOutputs;
-    QList<KDeclarative::QmlObject *> m_alternativesObjects;
     KDeclarative::QmlObject *m_interactiveConsole;
 
     QTimer m_waitingPanelsTimer;