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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xna.Framework;
using ShiftOS.Frontend.Apps;
using ShiftOS.Frontend.GraphicsSubsystem;
using static ShiftOS.Engine.SkinEngine;
namespace ShiftOS.Frontend.GUI
{
public class TextInput : Control
{
private string _label = "Type here!";
private string _text = "";
private int _index = 0;
private System.Drawing.Font _font = new System.Drawing.Font("Tahoma", 9f);
public int Index
{
get
{
return _index;
}
set
{
if (_index == value)
return;
if(_text.Length == 0)
{
_index = 0;
return;
}
_index = MathHelper.Clamp(value, 0, _text.Length);
CalculateVisibleText();
Invalidate();
}
}
public override void MouseStateChanged()
{
if (MouseLeftDown == true)
{
UIManager.FocusedControl = this;
Invalidate();
}
base.MouseStateChanged();
}
public string Text
{
get
{
return _text;
}
set
{
if (_text == value)
return;
_text = value;
if(_index >= _text.Length)
{
_index = _text.Length;
}
CalculateVisibleText();
Invalidate();
}
}
protected override void OnKeyEvent(KeyEvent e)
{
if (e.Key == Microsoft.Xna.Framework.Input.Keys.Enter)
return;
if(e.Key == Microsoft.Xna.Framework.Input.Keys.Left)
{
if (_index > 0)
_index--;
}
if(e.Key == Microsoft.Xna.Framework.Input.Keys.Delete)
{
if(_index < _text.Length - 1)
{
_text = _text.Remove(_index, 1);
}
}
if (e.Key == Microsoft.Xna.Framework.Input.Keys.Right)
if (_index < _text.Length)
_index++;
if (e.KeyChar != '\0') {
if (e.KeyChar == '\b')
{
if (_index > 0)
{
_text = _text.Remove(_index - 1, 1);
_index--;
}
}
else
{
_text = _text.Insert(_index, e.KeyChar.ToString());
_index++;
}
}
caretMS = 0;
CalculateVisibleText();
Invalidate();
base.OnKeyEvent(e);
}
float caretPos = 2f;
protected void CalculateVisibleText()
{
using(var gfx = System.Drawing.Graphics.FromHwnd(IntPtr.Zero))
{
string toCaret = _text.Substring(0, _index);
var measure = gfx.SmartMeasureString(toCaret, _font);
caretPos = 2 + measure.Width;
if(caretPos - _textDrawOffset < 0)
{
_textDrawOffset += (caretPos - _textDrawOffset);
}
if(caretPos - _textDrawOffset > Width)
{
_textDrawOffset -= caretPos - _textDrawOffset;
}
}
}
private float _textDrawOffset = 0;
protected override void OnPaint(GraphicsContext gfx)
{
gfx.DrawRectangle(0, 0, Width, Height, UIManager.SkinTextures["ControlTextColor"]);
gfx.DrawRectangle(1, 1, Width - 2, Height - 2, UIManager.SkinTextures["ControlColor"]);
int textY = (Height - _font.Height) / 2;
int caretHeight = _font.Height;
if (!string.IsNullOrWhiteSpace(Text))
{
gfx.DrawString(Text, (int)(2 - _textDrawOffset), textY, LoadedSkin.ControlTextColor.ToMonoColor(), _font);
}
if (IsFocusedControl)
{
if (caretMS <= 250)
{
//draw caret
gfx.DrawRectangle((int)(caretPos - _textDrawOffset), textY, 2, caretHeight, UIManager.SkinTextures["ControlTextColor"]);
}
}
else
{
if (string.IsNullOrWhiteSpace(Text) && !string.IsNullOrWhiteSpace(_label))
{
gfx.DrawString(_label, 2, textY, Color.Gray, _font);
}
}
}
private double caretMS = 0;
protected override void OnLayout(GameTime gameTime)
{
caretMS += gameTime.ElapsedGameTime.TotalMilliseconds;
if (caretMS >= 500)
caretMS = 0;
Invalidate();
}
}
}
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