<?php
/**
* Text Input
*
* @package Nc
*/
class NcTextInput extends NcWindow {
	/**
	* @var string Current value
	*/
	var $value = '';
	/**
	* @var string Last value
	*/
	var $last_value = '';
	/**
	* @var boolean Active
	*/
	var $active = false;
	/**
	* @var string Perl regular expression for filtering input
	*/
	var $filter = false;
	
	/**
	* Constructor
	*
	* Creates a new text input widget
	*
	* @param NcWindow $parent Parent window
	* @param integer $width Width
	* @param integer $y Row
	* @param integer $x Column
	* @param string $value Initial value
	* @param string $filter Perl regular expression for filtering input
	*/
	public function __construct( &$parent, $width, $y, $x, $value = '', $filter = false ) {
		parent::__construct( $parent, 1, $width, $y, $x, false );
		$this->last_value = $this->value = $value;
		$this->filter = $filter !== false && @preg_match( $filter, '' ) !== false ? $filter : false;
		$this->update();
	}
	/**
	* Update the input control on the screen
	*
	* Widget is highlighted when active
	*/
	public function update() {
		$this->attribute_on( NCURSES_A_UNDERLINE );
		if( $this->active ) {
			$this->attribute_on( NCURSES_A_REVERSE );
		}
		$this->write_fixed( 0, 0, substr( $this->value, - $this->width ) );
		$this->attribute_off( NCURSES_A_UNDERLINE );
		$this->attribute_off( NCURSES_A_REVERSE );
	}
	/**
	* Get or set value
	*/
	public function value( $value = false ) {
		if( $value === false ) {
			return $this->value;
		} else {
			$this->value = $value;
		}
	}
	/**
	* Activate input widget and accept input
	*
	* Input ends when the user presses the enter key.
	* If a filter has been set and the input does not pass the filter, the value
	* reverts to the previous value, and this function returns false.
	*
	* @return string|boolean Text entered, or false
	*/
	public function get() {
		$this->active = true;
		$this->update();
		while( $this->active ) {
			$key = $this->get_char();
			switch( $key ) {
				case NCURSES_KEY_BACKSPACE:
					$this->value = substr( $this->value, 0, strlen( $this->value ) - 1 );
					break;
				case 13:
					$this->active = false;
					break;
				default:
					if( in_array( $key, range( 32, 126 ) ) ) {
						$this->value .= chr( $key );
					}
			}
			$this->update();
		}
		$this->update();
		return $this->filter !== false && @preg_match( $this->filter, $this->value ) < 1 ? false : $this->value;
	}
	public function focus() {
		parent::focus();
		$this->active = true;
		$this->update();
	}
	public function blur() {
		$this->active = false;
		$this->update();
		parent::blur();
	}
	public function on_key_press($key) {
		switch( $key ) {
			case NCURSES_KEY_BACKSPACE:
				$this->value = substr( $this->value, 0, strlen( $this->value ) - 1 );
				break;
			case 27:
				// ESC
				$this->value = $this->last_value;
				break;
			case 9:
				// TAB
			case 13:
				// RETURN
				if( $this->value !== $this->last_value ) {
					$this->emit('change', $this->value);
				}
				$this->blur();
				break;
			default:
				if( in_array( $key, range( 32, 126 ) ) ) {
					$this->value .= chr( $key );
				}
				parent::on_key_press($key);
		}
		$this->update();
	}
}
?>