ClassiCube/Launcher2/Gui/Widgets/LauncherInputWidget.cs

using System;
using System.Drawing;
using System.Windows.Forms;
using ClassicalSharp;

namespace Launcher2 {

	/// <summary> Widget that represents text can have modified by the user. </summary>
	public sealed class LauncherInputWidget : LauncherWidget {
		
		public int ButtonWidth, ButtonHeight;
		
		/// <summary> Whether the input widget currently is focused through a mouse click or tab. </summary>
		public bool Active;
		
		/// <summary> Whether all characters should be rendered as *. </summary>
		public bool Password;
		
		/// <summary> Maximum number of characters that the 'Text' field can contain. </summary>
		public int MaximumTextLength = 32;
		
		/// <summary> Filter applied to text received from the clipboard. Can be null. </summary>
		public Func<string, string> ClipboardFilter;
		
		public LauncherInputWidget( LauncherWindow window ) : base( window ) {
		}

		public void DrawAt( IDrawer2D drawer, string text, Font font,
		                   Anchor horAnchor, Anchor verAnchor, int width, int height, int x, int y ) {
			ButtonWidth = width; ButtonHeight = height;
			Width = width; Height = height;
			CalculateOffset( x, y, horAnchor, verAnchor );
			Redraw( drawer, text, font );
		}
		
		public void Redraw( IDrawer2D drawer, string text, Font font ) {
			Text = text;
			if( Password )
				text = new String( '*', text.Length );
			DrawTextArgs args = new DrawTextArgs( text, font, true );
			Size size = drawer.MeasureSize( ref args );
			Width = Math.Max( ButtonWidth, size.Width + 7 );
			
			FastColour col = Active ? FastColour.White : new FastColour( 160, 160, 160 );
			drawer.DrawRectBounds( col, 2, X, Y, Width, Height );
			drawer.DrawRect( FastColour.Black, X + 2, Y + 2, Width - 4, Height - 4 );
			
			args.SkipPartsCheck = true;
			drawer.DrawText( ref args, X + 7, Y + 2 );
		}
		
		/// <summary> Appends a character to the end of the currently entered text. </summary>
		/// <returns> true if a redraw is necessary, false otherwise. </returns>
		public bool AppendChar( char c ) {
			if( c >= ' ' && c <= '~' && Text.Length < MaximumTextLength ) {
				Text += c;
				return true;
			}
			return false;
		}
		
		/// <summary> Removes the last character in the currently entered text. </summary>
		/// <returns> true if a redraw is necessary, false otherwise. </returns>
		public bool RemoveChar() {
			if( Text.Length == 0 ) return false;
			
			Text = Text.Substring( 0, Text.Length - 1 );
			return true;
		}
		
		/// <summary> Resets the currently entered text to an empty string </summary>
		/// <returns> true if a redraw is necessary, false otherwise. </returns>
		public bool ClearText() {
			if( Text.Length == 0 ) return false;
			
			Text = "";
			return true;
		}
		
		/// <summary> Copies the contents of the currently entered text to the system clipboard. </summary>
		public void CopyToClipboard() {
			if( !String.IsNullOrEmpty( Text ) )
				Clipboard.SetText( Text );
		}
		
		/// <summary> Sets the currently entered text to the contents of the system clipboard. </summary>
		/// <returns> true if a redraw is necessary, false otherwise. </returns>
		public bool CopyFromClipboard() {
			string text = Clipboard.GetText();
			if( String.IsNullOrEmpty( text ) 
			   || Text.Length >= MaximumTextLength ) return false;
			
			if( ClipboardFilter != null )
				text = ClipboardFilter( text );
			if( Text.Length + text.Length > MaximumTextLength ) {
				text = text.Substring( 0, MaximumTextLength - Text.Length );
			}
			Text += text;
			return true;
		}
	}
}