int FocusRingSort(FocusRingRecord a, FocusRingRecord b)
{
if (a.m_Focusable.tabIndex == 0 && b.m_Focusable.tabIndex == 0)
{
return(FocusRingAutoIndexSort(a, b));
}
else if (a.m_Focusable.tabIndex == 0)
{
// Only b has a focus index. It has priority.
return(1);
}
else if (b.m_Focusable.tabIndex == 0)
{
// Only a has a focus index. It has priority.
return(-1);
}
else
{
// a and b should be ordered using their focus index.
int result = Comparer <int> .Default.Compare(a.m_Focusable.tabIndex, b.m_Focusable.tabIndex);
// but if the focus index result is being equal, we need to fallback with their automatic index
if (result == 0)
{
result = FocusRingAutoIndexSort(a, b);
}
return(result);
}
}
void BuildRingForScopeRecursive(VisualElement ve, ref int scopeIndex, List <FocusRingRecord> scopeList)
{
var veChildCount = ve.hierarchy.childCount;
for (int i = 0; i < veChildCount; i++)
{
var child = ve.hierarchy[i];
bool isSlot = child.parent != null && child == child.parent.contentContainer;
if (child.isCompositeRoot || isSlot)
{
var childRecord = new FocusRingRecord
{
m_AutoIndex = scopeIndex++,
m_Focusable = child,
m_IsSlot = isSlot,
m_ScopeNavigationOrder = new List <FocusRingRecord>()
};
scopeList.Add(childRecord);
int autoIndex = 0;
BuildRingForScopeRecursive(child, ref autoIndex, childRecord.m_ScopeNavigationOrder);
}
else
{
// isHierarchyDisplayed is not checked in canGrabFocus to let a hidden VisualElement grab the focus when calling the Focus method.
if (child.canGrabFocus && child.isHierarchyDisplayed && child.tabIndex >= 0)
{
scopeList.Add(new FocusRingRecord
{
m_AutoIndex = scopeIndex++,
m_Focusable = child,
m_IsSlot = false,
m_ScopeNavigationOrder = null
});
}
BuildRingForScopeRecursive(child, ref scopeIndex, scopeList);
}
}
}
void BuildRingForScopeRecursive(VisualElement ve, ref int scopeIndex, List <FocusRingRecord> scopeList)
{
for (int i = 0; i < ve.hierarchy.childCount; i++)
{
var child = ve.hierarchy[i];
bool isSlot = child.parent != null && child == child.parent.contentContainer;
if (child.isCompositeRoot || isSlot)
{
var childRecord = new FocusRingRecord
{
m_AutoIndex = scopeIndex++,
m_Focusable = child,
m_IsSlot = isSlot,
m_ScopeNavigationOrder = new List <FocusRingRecord>()
};
scopeList.Add(childRecord);
int autoIndex = 0;
BuildRingForScopeRecursive(child, ref autoIndex, childRecord.m_ScopeNavigationOrder);
}
else
{
if (child.canGrabFocus && child.tabIndex >= 0)
{
scopeList.Add(new FocusRingRecord
{
m_AutoIndex = scopeIndex++,
m_Focusable = child,
m_IsSlot = false,
m_ScopeNavigationOrder = null
});
}
BuildRingForScopeRecursive(child, ref scopeIndex, scopeList);
}
}
}
int FocusRingAutoIndexSort(FocusRingRecord a, FocusRingRecord b)
{
// FIXME: Write specialized methods for each defaultFocusOrder.
switch (defaultFocusOrder)
{
case DefaultFocusOrder.ChildOrder:
default:
return(Comparer <int> .Default.Compare(a.m_AutoIndex, b.m_AutoIndex));
case DefaultFocusOrder.PositionXY:
{
VisualElement ave = a.m_Focusable as VisualElement;
VisualElement bve = b.m_Focusable as VisualElement;
if (ave != null && bve != null)
{
if (ave.layout.position.x < bve.layout.position.x)
{
return(-1);
}
else if (ave.layout.position.x > bve.layout.position.x)
{
return(1);
}
else
{
if (ave.layout.position.y < bve.layout.position.y)
{
return(-1);
}
else if (ave.layout.position.y > bve.layout.position.y)
{
return(1);
}
}
}
// a and b should be ordered using their order of appearance.
return(Comparer <int> .Default.Compare(a.m_AutoIndex, b.m_AutoIndex));
}
case DefaultFocusOrder.PositionYX:
{
VisualElement ave = a.m_Focusable as VisualElement;
VisualElement bve = b.m_Focusable as VisualElement;
if (ave != null && bve != null)
{
if (ave.layout.position.y < bve.layout.position.y)
{
return(-1);
}
else if (ave.layout.position.y > bve.layout.position.y)
{
return(1);
}
else
{
if (ave.layout.position.x < bve.layout.position.x)
{
return(-1);
}
else if (ave.layout.position.x > bve.layout.position.x)
{
return(1);
}
}
}
// a and b should be ordered using their order of appearance.
return(Comparer <int> .Default.Compare(a.m_AutoIndex, b.m_AutoIndex));
}
}
}
