Merge lp:~ahayzen/music-app/remix-defer-cardview-load into lp:music-app/remix

[Andrew Hayzen]

* Only load model once CardView is visible

* Only load model once CardView is visible

This helps with loading the thumbnails for recent faster as it doesn't attempt to load Albums/Artists etc at the same time.

[Ubuntu Phone Apps Jenkins Bot (ubuntu-phone-apps-jenkins-bot)]

FAILED: Continuous integration, rev:705
http://91.189.93.70:8080/job/music-app-remix-ci/186/
Executed test runs:
    UNSTABLE: http://91.189.93.70:8080/job/generic-mediumtests-utopic-python3/1308
        deb: http://91.189.93.70:8080/job/generic-mediumtests-utopic-python3/1308/artifact/work/output/*zip*/output.zip
    SUCCESS: http://91.189.93.70:8080/job/music-app-remix-utopic-amd64-ci/186

Click here to trigger a rebuild:
http://91.189.93.70:8080/job/music-app-remix-ci/186/rebuild

review: Needs Fixing (continuous-integration)

[Victor Thompson (vthompson)]

LGTM, I assume the jenkins failure is a fluke failure.

review: Approve

[Ubuntu Phone Apps Jenkins Bot (ubuntu-phone-apps-jenkins-bot)]

review: Approve (continuous-integration)

=== modified file 'common/CardView.qml'
--- common/CardView.qml	2014-10-22 17:37:45 +0000
+++ common/CardView.qml	2014-10-27 22:39:33 +0000
@@ -32,9 +32,15 @@
     property alias count: flow.count
     property alias delegate: flow.delegate
     property alias header: headerLoader.sourceComponent
-    property alias model: flow.model
+    property var model: flow.model
     property real itemWidth: units.gu(15)
 
+    onVisibleChanged: {
+        if (visible) {  // only load model once CardView is visible
+            flow.model = model
+        }
+    }
+
     Loader {
         id: headerLoader
         asynchronous: true
@@ -56,7 +62,6 @@
                 fill: parent
                 margins: units.gu(1)
             }
-
             columns: parseInt(width / itemWidth)
         }
     }