Added an async indexOf function to the SearchAndBrowseModel

It takes a JS functor as the second argument, which will be
executed once the result is returned from the backend.

Started to use this method in the tuner example and backend

Change-Id: I11794e1dbc8f182f1ba06e10423fc937ceae8909
Reviewed-by: Johan Thelin <johan.thelin@pelagicore.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/examples/media/tuner/main.qml b/examples/media/tuner/main.qml
index fe5313f..bca4849 100644
--- a/examples/media/tuner/main.qml
+++ b/examples/media/tuner/main.qml
@@ -191,6 +191,7 @@ ApplicationWindow {
                     }
 
                     Button {
+                        id: addButton
                         text: "+"
                         width: parent.width / 10
                         height: parent.height
@@ -198,6 +199,21 @@ ApplicationWindow {
                         onClicked: {
                             presetsModel.insert(0, model.item)
                         }
+
+                        function checkExists() {
+                            presetsModel.indexOf(model.item, function (index) {
+                                addButton.enabled = (index == -1)
+                            })
+                        }
+
+                        Component.onCompleted: {
+                            checkExists()
+                        }
+
+                        Connections {
+                            target: presetsModel
+                            onCountChanged: addButton.checkExists()
+                        }
                     }
                 }
             }