public static CanvasPositionCursor PrevInputItem(
this CanvasPositionCursor Cursor, ScreenVisualItems VisualItems,
VisualFeature?Feature = null, bool Reuse = true)
{
VisualItemCursor vc = null;
var cursor = Cursor;
if (cursor.IsOutsideVisualItem() == true)
{
vc = VisualItems.FindPrevInputItem(cursor.RowCol, Feature);
}
else
{
vc = Cursor.ItemCursor.PrevInputItem(Feature);
}
if (vc == null)
{
cursor = null;
}
else if (Reuse == true)
{
cursor.ItemCursor = vc;
cursor.Position = 1;
}
else
{
cursor = new CanvasPositionCursor(vc, 1);
}
return(cursor);
}
public void PositionCaret(OneRowCol CaretRowCol)
{
// position the caret cursor.
VisualItemCursor ic = null;
if (CaretRowCol != null)
{
var rowCol = CaretRowCol.ToZeroRowCol();
this.CaretCursor = VisualItems.FindVisualItemCanvas(rowCol);
}
else
{
// find the first field on the screen.
ic = VisualItems.InputItemList().FirstOrDefault();
this.CaretCursor = new CanvasPositionCursor(ic);
}
// by default. place the caret at first input field on screen.
if (this.CaretCursor.RowCol == null)
{
var rowCol = new ZeroRowCol(0, 0);
this.CaretCursor = VisualItems.FindVisualItemCanvas(rowCol);
}
// position the caret cursor at the visual item.
this.CanvasCaret.StartBlink(this.CaretCursor, true);
}
/// <summary>
/// construct cursor from position within a visual item.
/// </summary>
/// <param name="ItemCursor"></param>
/// <param name="Position"></param>
public CanvasPositionCursor(VisualItemCursor VisualCursor, int Position = 1)
{
this.ItemCursor = VisualCursor;
this.Position = Position;
}
