From: Julien Heanley <j.heanley@partner.samsung.com>
Date: Wed, 11 Jun 2014 12:37:11 +0000 (+0100)
Subject: ScrollView - Fix for scroll effect issues found due to ruler disabling not updating... 
X-Git-Tag: dali_1.0.0~54
X-Git-Url: http://review.tizen.org/git/?p=platform%2Fcore%2Fuifw%2Fdali-toolkit.git;a=commitdiff_plain;h=2f4e949a884fbafbcdffd630720ea59513ee1c93

ScrollView - Fix for scroll effect issues found due to ruler disabling not updating min/max scroll positions

[problem]      Scrolling could result in page disappearing during scrolling due to incorrect scroll domain (change homescreen scroll effect to outer cube/spiral)
[solution]     Added code to deal with ruler being disabled, now the min/max values for that ruler are reset to 0

Change-Id: I34e95761fb58dfe4d2bc3580671415f1f6f2e707
Signed-off-by: Julien Heanley <j.heanley@partner.samsung.com>
Signed-off-by: Adeel Kazmi <adeel.kazmi@samsung.com>
---

diff --git a/base/dali-toolkit/internal/controls/scrollable/scroll-view/scroll-view-impl.cpp b/base/dali-toolkit/internal/controls/scrollable/scroll-view/scroll-view-impl.cpp
index 8b51d82..38c3555 100644
--- a/base/dali-toolkit/internal/controls/scrollable/scroll-view/scroll-view-impl.cpp
+++ b/base/dali-toolkit/internal/controls/scrollable/scroll-view/scroll-view-impl.cpp
@@ -623,7 +623,9 @@ ScrollView::ScrollView()
   mWrapMode(false),
   mAxisAutoLock(false),
   mAlterChild(false),
-  mDefaultMaxOvershoot(true)
+  mDefaultMaxOvershoot(true),
+  mCanScrollHorizontal(true),
+  mCanScrollVertical(true)
 {
   SetRequiresMouseWheelEvents(true);
 }
@@ -939,8 +941,8 @@ void ScrollView::UpdatePropertyDomain(const Vector3& size)
   if(mRulerX->IsEnabled())
   {
     const Toolkit::RulerDomain& rulerDomain = mRulerX->GetDomain();
-    if( fabsf(min.x - rulerDomain.min) > Math::MACHINE_EPSILON_10000
-        || fabsf(max.x - rulerDomain.max) > Math::MACHINE_EPSILON_10000 )
+    if( fabsf(min.x - rulerDomain.min) > Math::MACHINE_EPSILON_100
+        || fabsf(max.x - rulerDomain.max) > Math::MACHINE_EPSILON_100 )
     {
       domainChanged = true;
       min.x = rulerDomain.min;
@@ -954,17 +956,26 @@ void ScrollView::UpdatePropertyDomain(const Vector3& size)
         mScrollPrePosition.x = Clamp(mScrollPrePosition.x, -(max.x - size.x), -min.x);
       }
     }
-    if( (fabsf(rulerDomain.max - rulerDomain.min) - size.x) > Math::MACHINE_EPSILON_10000 )
+    if( (fabsf(rulerDomain.max - rulerDomain.min) - size.x) > Math::MACHINE_EPSILON_100 )
     {
       canScrollHorizontal = true;
     }
   }
+  else if( fabs(min.x) > Math::MACHINE_EPSILON_100
+           || fabs(max.x) > Math::MACHINE_EPSILON_100 )
+  {
+    // need to reset to 0
+    domainChanged = true;
+    min.x = 0.0f;
+    max.x = 0.0f;
+    canScrollHorizontal = false;
+  }
 
   if(mRulerY->IsEnabled())
   {
     const Toolkit::RulerDomain& rulerDomain = mRulerY->GetDomain();
-    if( fabsf(min.y - rulerDomain.min) > Math::MACHINE_EPSILON_10000
-        || fabsf(max.y - rulerDomain.max) > Math::MACHINE_EPSILON_10000 )
+    if( fabsf(min.y - rulerDomain.min) > Math::MACHINE_EPSILON_100
+        || fabsf(max.y - rulerDomain.max) > Math::MACHINE_EPSILON_100 )
     {
       domainChanged = true;
       min.y = rulerDomain.min;
@@ -978,18 +989,30 @@ void ScrollView::UpdatePropertyDomain(const Vector3& size)
         mScrollPrePosition.y = Clamp(mScrollPrePosition.y, -(max.y - size.y), -min.y);
       }
     }
-    if( (fabsf(rulerDomain.max - rulerDomain.min) - size.y) > Math::MACHINE_EPSILON_10000 )
+    if( (fabsf(rulerDomain.max - rulerDomain.min) - size.y) > Math::MACHINE_EPSILON_100 )
     {
       canScrollVertical = true;
     }
   }
+  else if( fabs(min.y) > Math::MACHINE_EPSILON_100
+           || fabs(max.y) > Math::MACHINE_EPSILON_100 )
+  {
+    // need to reset to 0
+    domainChanged = true;
+    min.y = 0.0f;
+    max.y = 0.0f;
+    canScrollHorizontal = false;
+  }
+
   // avoid setting properties if possible, otherwise this will cause an entire update as well as triggering constraints using each property we update
-  if( self.GetProperty<bool>(mPropertyCanScrollVertical) != canScrollVertical )
+  if( mCanScrollVertical != canScrollVertical )
   {
+    mCanScrollVertical = canScrollVertical;
     self.SetProperty(mPropertyCanScrollVertical, canScrollVertical);
   }
-  if( self.GetProperty<bool>(mPropertyCanScrollHorizontal) != canScrollHorizontal )
+  if( mCanScrollHorizontal != canScrollHorizontal )
   {
+    mCanScrollHorizontal = canScrollHorizontal;
     self.SetProperty(mPropertyCanScrollHorizontal, canScrollHorizontal);
   }
   if( scrollPositionChanged )
@@ -1000,8 +1023,8 @@ void ScrollView::UpdatePropertyDomain(const Vector3& size)
   {
     mMinScroll = min;
     mMaxScroll = max;
-    self.SetProperty(mPropertyPositionMin, min );
-    self.SetProperty(mPropertyPositionMax, max );
+    self.SetProperty(mPropertyPositionMin, mMinScroll );
+    self.SetProperty(mPropertyPositionMax, mMaxScroll );
   }
 }
 
diff --git a/base/dali-toolkit/internal/controls/scrollable/scroll-view/scroll-view-impl.h b/base/dali-toolkit/internal/controls/scrollable/scroll-view/scroll-view-impl.h
index 77587b7..3f8562f 100644
--- a/base/dali-toolkit/internal/controls/scrollable/scroll-view/scroll-view-impl.h
+++ b/base/dali-toolkit/internal/controls/scrollable/scroll-view/scroll-view-impl.h
@@ -991,6 +991,8 @@ private:
   bool mAlterChild:1;                     ///< Internal flag to control behavior of OnChildAdd/OnChildRemove when Adding internal Actors.
   bool mDefaultMaxOvershoot:1;            ///< Whether to use default max overshoot or application defined one
   bool mUserSetPosition:1;                ///< SetScrollPosition has been called, return this position until internals get control of scroll position again
+  bool mCanScrollHorizontal:1;              ///< Local value of our property to check against
+  bool mCanScrollVertical:1;                ///< Local value of our property to check against
 };
 
 } // namespace Internal