From 105c1aa9d8d380275946d9cd8b3236e4c844969a Mon Sep 17 00:00:00 2001
From: Dominik Holland <dominik.holland@pelagicore.com>
Date: Thu, 13 Oct 2016 13:01:51 +0200
Subject: [PATCH] Performance improvement

The ListView of MenuScreen doesn't hide Item's which are currently not
on the screen. The logic has been improved to hide all Items which
are not on the Screen and are not needed for a transition.

In addition we make sure that the surface for the mapWidget is hidden
once the HomeScreen is not visible.

Change-Id: I1974ce997811366fe9f011612b5fa5d91aa7e76d
Reviewed-by: Nedim Hadzic <nedim.hadzic@pelagicore.com>
---
 sysui/Home/MapWidget.qml |  1 +
 sysui/MenuScreen.qml     | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/sysui/Home/MapWidget.qml b/sysui/Home/MapWidget.qml
index fb81e18..9a419a3 100644
--- a/sysui/Home/MapWidget.qml
+++ b/sysui/Home/MapWidget.qml
@@ -67,6 +67,7 @@ UIPanel {
             ApplicationManagerInterface.mapWidget.width = Qt.binding(function () { return loader.width})
             ApplicationManagerInterface.mapWidget.height = loader.height
             loader.children = ApplicationManagerInterface.mapWidget
+            ApplicationManagerInterface.mapWidget.visible = Qt.binding(function () { return root.visible})
         }
     }
 }
diff --git a/sysui/MenuScreen.qml b/sysui/MenuScreen.qml
index aef4380..9abcb3e 100644
--- a/sysui/MenuScreen.qml
+++ b/sysui/MenuScreen.qml
@@ -60,24 +60,44 @@ PageSwipeScreen {
         MyCarPage {
             width: root.itemWidth
             height: root.height
+            visible: root.currentIndex === ObjectModel.index ||
+                     root.moving &&
+                     (root.currentIndex + 1  === ObjectModel.index ||
+                      root.currentIndex - 1  === ObjectModel.index)
         }
         FunctionsPage {
             width: root.itemWidth
             height: root.height
+            visible: root.currentIndex === ObjectModel.index ||
+                     root.moving &&
+                     (root.currentIndex + 1  === ObjectModel.index ||
+                      root.currentIndex - 1  === ObjectModel.index)
         }
         HomePage {
             width: root.itemWidth
             height: root.height
+            visible: root.currentIndex === ObjectModel.index ||
+                     root.moving &&
+                     (root.currentIndex + 1  === ObjectModel.index ||
+                      root.currentIndex - 1  === ObjectModel.index)
         }
         LauncherPage {
             id: launcher
             width: root.itemWidth
             height: root.height
             onUpdateApp: currentIndex = 3
+            visible: root.currentIndex === ObjectModel.index ||
+                     root.moving &&
+                     (root.currentIndex + 1  === ObjectModel.index ||
+                      root.currentIndex - 1  === ObjectModel.index)
         }
         CloudPage {
             width: root.itemWidth
             height: root.height
+            visible: root.currentIndex === ObjectModel.index ||
+                     root.moving &&
+                     (root.currentIndex + 1  === ObjectModel.index ||
+                      root.currentIndex - 1  === ObjectModel.index)
         }
     }
 }