internal static int GetCursorPosition(this IUITextInput platformView, int cursorOffset = 0)
{
var zeroPosition = platformView.GetPosition(platformView.BeginningOfDocument, 0);
var currentCursorPosition = platformView.SelectedTextRange?.Start ?? zeroPosition;
var newCursorPosition = cursorOffset + (int)platformView.GetOffsetFromPosition(platformView.BeginningOfDocument, currentCursorPosition);
return(Math.Max(0, newCursorPosition));
}
public static UITextRange GetTextRange(this IUITextInput textInput, int start, int end)
{
if (textInput?.BeginningOfDocument == null)
{
return(null);
}
var from = textInput.GetPosition(textInput.BeginningOfDocument, start);
var to = textInput.GetPosition(textInput.BeginningOfDocument, end);
if (from == null || to == null)
{
return(null);
}
return(textInput.GetTextRange(from, to));
}
internal static void SetTextRange(this IUITextInput platformView, int start, int selectedTextLength)
{
int end = start + selectedTextLength;
// Let's be sure we have positive positions
start = Math.Max(start, 0);
end = Math.Max(end, 0);
// Switch start and end positions if necessary
start = Math.Min(start, end);
end = Math.Max(start, end);
var startPosition = platformView.GetPosition(platformView.BeginningOfDocument, start);
var endPosition = platformView.GetPosition(platformView.BeginningOfDocument, end);
platformView.SelectedTextRange = platformView.GetTextRange(startPosition, endPosition);
}