object IAccessible.accNavigate(NAVDIR navDir, VarInt varStart)
{
int i = varStart;
if (navDir == NAVDIR.FIRSTCHILD || navDir == NAVDIR.LASTCHILD)
{
if (i != -1)
{
return(null);
}
}
else
{
if (i == -1)
{
return(_StdAO.accNavigate(navDir, varStart)); //never mind: gets some not adjacent UI element
}
}
var v = Navigate(navDir, i);
if (v == null)
{
return(null);
}
return(v.Value + 1);
}
public override int?Navigate(NAVDIR navDir, int childStart)
{
if (childStart == -1) //navDir can be only first or last
{
int n = _tv.CountVisible; if (n == 0)
{
return(null);
}
return(navDir == NAVDIR.FIRSTCHILD ? 0 : n - 1);
}
else //navDir cannot be first or last
{
switch (navDir)
{
case NAVDIR.PREVIOUS:
case NAVDIR.UP:
if (childStart > 0)
{
return(childStart - 1);
}
break;
case NAVDIR.NEXT:
case NAVDIR.DOWN:
if (++childStart < _tv.CountVisible)
{
return(childStart);
}
break;
}
return(null);
}
}
object IAccessible.accNavigate(NAVDIR navDir, VarInt varStart)
{
int i = varStart;
if (navDir == NAVDIR.FIRSTCHILD || navDir == NAVDIR.LASTCHILD)
{
if (i == -1)
{
return(navDir == NAVDIR.FIRSTCHILD ? 1 : _a.Count);
}
}
else
{
if (i == -1)
{
return(_StdAO.accNavigate(navDir, varStart));
}
switch (navDir)
{
case NAVDIR.PREVIOUS:
if (i > 0)
{
return(i);
}
break;
case NAVDIR.NEXT:
if (++i < _a.Count)
{
return(i + 1);
}
break;
}
}
return(null);
}
/// <summary> /// Returns null. /// If self (childStart==-1), navDir is FIRSTCHILD or LASTCHILD, else navDir is any except these. /// </summary> public virtual int?Navigate(NAVDIR navDir, int childStart) => null;