Prevent multiple instances of the same page on the StackView and stub out GamepadMapper

app/gui/GamepadMapper.qml

@@ -0,0 +1,5 @@
+import QtQuick 2.0
+
+Item {
+    objectName: "Gamepad Mapping"
+}

app/gui/PcView.qml

@@ -144,7 +144,7 @@ GridView {
                         var component = Qt.createComponent("AppView.qml")
                         var appView = component.createObject(stackView)
                         appView.computerIndex = index
-                        appView.objectName = "Apps on " + model.name
+                        appView.objectName = model.name
                         stackView.push(appView)
                     }
                     else {

app/gui/main.qml

@@ -15,6 +15,22 @@ ApplicationWindow {
         anchors.fill: parent
     }
 
+    function navigateTo(url, objectName)
+    {
+        var existingItem = stackView.find(function(item, index) {
+            return item.objectName === objectName
+        })
+
+        if (existingItem !== null) {
+            // Pop to the existing item
+            stackView.pop(existingItem)
+        }
+        else {
+            // Create a new item
+            stackView.push(url)
+        }
+    }
+
     header: ToolBar {
 
         RowLayout {
@@ -45,17 +61,6 @@ ApplicationWindow {
                 Layout.fillWidth: true
             }
 
-            ToolButton {
-                icon.source: "qrc:/res/settings.png"
-                onClicked: stackView.push("qrc:/gui/SettingsView.qml")
-
-                Menu {
-                    id: optionsMenu
-                    x: parent.width
-                    transformOrigin: Menu.TopRight
-                }
-            }
-
             ToolButton {
                 icon.source: "qrc:/res/question_mark.png"
 
@@ -68,6 +73,28 @@ ApplicationWindow {
                     transformOrigin: Menu.TopRight
                 }
             }
+
+            ToolButton {
+                icon.source: "qrc:/res/ic_videogame_asset_white_48px.svg"
+                onClicked: navigateTo("qrc:/gui/GamepadMapper.qml", "Gamepad Mapping")
+
+                Menu {
+                    id: gamepadMappingMenu
+                    x: parent.width
+                    transformOrigin: Menu.TopRight
+                }
+            }
+
+            ToolButton {
+                icon.source: "qrc:/res/settings.png"
+                onClicked: navigateTo("qrc:/gui/SettingsView.qml", "Settings")
+
+                Menu {
+                    id: optionsMenu
+                    x: parent.width
+                    transformOrigin: Menu.TopRight
+                }
+            }
         }
     }
 }

app/qml.qrc

@@ -8,5 +8,6 @@
         <file>gui/AppView.qml</file>
         <file>gui/SettingsView.qml</file>
         <file>gui/StreamSegue.qml</file>
+        <file>gui/GamepadMapper.qml</file>
     </qresource>
 </RCC>