Add quit cli command and app quit option after stream session. Fixes #92 (#138)

* Add quit cli command and app quit option after stream session. Fixes #92

* Code review fixes.

app/gui/CliStartStreamSegue.qml

@@ -1,3 +1,4 @@
+import QtQml 2.2
 import QtQuick 2.0
 import QtQuick.Controls 2.2
 import QtQuick.Dialogs 1.2
@@ -30,13 +31,19 @@ Item {
         errorDialog.open()
     }
 
+    function onAppQuitRequired(appName) {
+        quitAppDialog.appName = appName
+        quitAppDialog.open()
+    }
+
     onVisibleChanged: {
-        if (visible) {
+        if (visible && !launcher.isExecuted()) {
             toolBar.visible = false
             launcher.searchingComputer.connect(onSearchingComputer)
             launcher.searchingApp.connect(onSearchingApp)
             launcher.sessionCreated.connect(onSessionCreated)
             launcher.failed.connect(onLaunchFailed)
+            launcher.appQuitRequired.connect(onAppQuitRequired)
             launcher.execute(ComputerManager)
         }
     }
@@ -74,4 +81,44 @@ Item {
         }
     }
 
+    MessageDialog {
+        id: quitAppDialog
+        modality:Qt.WindowModal
+        text:"Are you sure you want to quit " + appName +"? Any unsaved progress will be lost."
+        standardButtons: StandardButton.Yes | StandardButton.No
+        property string appName : ""
+
+        function quitApp() {
+            var component = Qt.createComponent("QuitSegue.qml")
+            var params = {"appName": appName}
+            stackView.push(component.createObject(stackView, params))
+            // Trigger the quit after pushing the quit segue on screen
+            launcher.quitRunningApp()
+        }
+
+        onYes: quitApp()
+
+        // For keyboard/gamepad navigation
+        onAccepted: quitApp()
+
+        // Exit process if app quit is rejected (reacts also to closing of the
+        // dialog from title bar's close button).
+        // Note: this depends on undocumented behavior of visibleChanged()
+        // signal being emitted before yes() or accepted() has been emitted.
+        onVisibleChanged: {
+            if (!visible) {
+                quitTimer.start()
+            }
+        }
+        Component.onCompleted: {
+            yes.connect(quitTimer.stop)
+            accepted.connect(quitTimer.stop)
+        }
+    }
+
+    Timer {
+        id: quitTimer
+        interval: 100
+        onTriggered: Qt.quit()
+    }
 }