/// <summary>
/// Called every frame before update.
/// TextInput implement this function to get keyboard input and also to animate caret timer.
/// </summary>
override protected void DoBeforeUpdate()
{
// animate caret
_caretAnim += (float)UserInterface.Active.CurrGameTime.ElapsedGameTime.TotalSeconds * CaretBlinkingSpeed;
// if the element is not focused, return
if (!IsFocused)
{
return;
}
// validate caret position
FixCaretPosition();
// get user input
char?currCharacterInput = KeyboardInput.GetTextInput();
Keys currCharacterInputKey = KeyboardInput.GetInputKey();
// if input char is invalid, return
if (currCharacterInput == null)
{
return;
}
// if the input char is not supported, return
if (currCharacterInput != '\0' && !TextParagraph.isCharacterSupported((char)currCharacterInput))
{
return;
}
// init some values to handle user input
string oldVal = _value;
int oldCaret = _caret;
int newCaretIndex = (_caret == -1 ? _value.Length : _caret);
if (currCharacterInput != '\0')
{
// for normal character input, insert them in the text
_value = _value.Insert(newCaretIndex++, currCharacterInput.ToString());
}
else if (UserInterface.ControlKeys.Contains(currCharacterInputKey))
{
newCaretIndex = HandleControlInputKeys(newCaretIndex, currCharacterInputKey);
}
// if carret move or text change, make it stay a little longer on screen before blinking again
if (_caret != newCaretIndex || _value != oldVal)
{
PauseCaretBlink();
}
// update caret position
_caret = newCaretIndex;
// if value changed:
if (_value != oldVal)
{
// if new characters were added and input is now illegal, revert to previous value
if (!ValidateInput(ref _value, oldVal))
{
_value = oldVal;
_caret = oldCaret;
}
// call change event
if (_value != oldVal)
{
DoOnValueChange();
}
// fix caret position
FixCaretPosition();
}
// when a key is pressed, recalculate scrollbas max value and scroll to caret
calculateScrollBarMaxValue();
ScrollToCaret();
// call base do-before-update
base.DoBeforeUpdate();
}
