File 0020-Do-not-emit-origin-X-Y-Changed-unnecessarily.patch of Package qt

From 7ab8e1fb8a011297417e952512e7ea5fed7fe63e Mon Sep 17 00:00:00 2001
From: Matt Vogt <matthew.vogt@jollamobile.com>
Date: Fri, 30 Nov 2012 14:16:36 +1000
Subject: [PATCH 20/29] Do not emit origin{X|Y}Changed unnecessarily

These signals should be emitted only when the relevant value has
actually changed.
---
 src/declarative/graphicsitems/qdeclarativeflickable.cpp   |   12 ++++++++++--
 src/declarative/graphicsitems/qdeclarativeflickable_p_p.h |    3 ++-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/declarative/graphicsitems/qdeclarativeflickable.cpp b/src/declarative/graphicsitems/qdeclarativeflickable.cpp
index 9b819ca..b39f06f 100644
--- a/src/declarative/graphicsitems/qdeclarativeflickable.cpp
+++ b/src/declarative/graphicsitems/qdeclarativeflickable.cpp
@@ -419,12 +419,20 @@ void QDeclarativeFlickablePrivate::updateBeginningEnd()
 
     if (vData.extentsChanged) {
         vData.extentsChanged = false;
-        emit q->originYChanged();
+        qreal newOrigin = q->originY();
+        if (newOrigin != vData.origin) {
+            vData.origin = newOrigin;
+            emit q->originYChanged();
+        }
     }
 
     if (hData.extentsChanged) {
         hData.extentsChanged = false;
-        emit q->originXChanged();
+        qreal newOrigin = q->originX();
+        if (newOrigin != hData.origin) {
+            hData.origin = newOrigin;
+            emit q->originXChanged();
+        }
     }
 
     if (atBoundaryChange)
diff --git a/src/declarative/graphicsitems/qdeclarativeflickable_p_p.h b/src/declarative/graphicsitems/qdeclarativeflickable_p_p.h
index 3e5890e..781a964 100644
--- a/src/declarative/graphicsitems/qdeclarativeflickable_p_p.h
+++ b/src/declarative/graphicsitems/qdeclarativeflickable_p_p.h
@@ -98,7 +98,7 @@ public:
 
     struct AxisData {
         AxisData(QDeclarativeFlickablePrivate *fp, void (QDeclarativeFlickablePrivate::*func)(qreal))
-            : move(fp, func), viewSize(-1), startMargin(0), endMargin(0)
+            : move(fp, func), viewSize(-1), startMargin(0), endMargin(0), origin(0)
             , smoothVelocity(fp), atEnd(false), atBeginning(true)
             , fixingUp(false), inOvershoot(false), moving(false), flicking(false)
             , dragging(false), extentsChanged(false)
@@ -131,6 +131,7 @@ public:
         qreal flickTarget;
         qreal startMargin;
         qreal endMargin;
+        qreal origin;
         QDeclarativeFlickablePrivate::Velocity smoothVelocity;
         QPODVector<qreal,10> velocityBuffer;
         bool atEnd : 1;
-- 
1.7.10.3