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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using MonoGame.Extended.Input.InputListeners;
namespace MonoGame.Extended.Gui.Controls
{
public abstract class SelectorControl : Control
{
protected SelectorControl()
{
}
private int _selectedIndex = -1;
public virtual int SelectedIndex
{
get { return _selectedIndex; }
set
{
if (_selectedIndex != value)
{
_selectedIndex = value;
SelectedIndexChanged?.Invoke(this, EventArgs.Empty);
}
}
}
public override IEnumerable<Control> Children => Items.OfType<Control>();
public virtual List<object> Items { get; } = new List<object>();
public virtual Color SelectedTextColor { get; set; } = Color.White;
public virtual Color SelectedItemColor { get; set; } = Color.CornflowerBlue;
public virtual Thickness ItemPadding { get; set; } = new Thickness(4, 2);
public virtual string NameProperty { get; set; }
public event EventHandler SelectedIndexChanged;
protected int FirstIndex;
public object SelectedItem
{
get { return SelectedIndex >= 0 && SelectedIndex <= Items.Count - 1 ? Items[SelectedIndex] : null; }
set { SelectedIndex = Items.IndexOf(value); }
}
public override bool OnKeyPressed(IGuiContext context, KeyboardEventArgs args)
{
if (args.Key == Keys.Down) ScrollDown();
if (args.Key == Keys.Up) ScrollUp();
return base.OnKeyPressed(context, args);
}
public override void OnScrolled(int delta)
{
base.OnScrolled(delta);
if (delta < 0) ScrollDown();
if (delta > 0) ScrollUp();
}
private void ScrollDown()
{
if (SelectedIndex < Items.Count - 1)
SelectedIndex++;
}
private void ScrollUp()
{
if (SelectedIndex > 0)
SelectedIndex--;
}
public override bool OnPointerDown(IGuiContext context, PointerEventArgs args)
{
var contentRectangle = GetListAreaRectangle(context);
for (var i = FirstIndex; i < Items.Count; i++)
{
var itemRectangle = GetItemRectangle(context, i - FirstIndex, contentRectangle);
if (itemRectangle.Contains(args.Position))
{
SelectedIndex = i;
OnItemClicked(context, args);
break;
}
}
return base.OnPointerDown(context, args);
}
protected virtual void OnItemClicked(IGuiContext context, PointerEventArgs args) { }
protected TextInfo GetItemTextInfo(IGuiContext context, Rectangle itemRectangle, object item)
{
var textRectangle = new Rectangle(itemRectangle.X + ItemPadding.Left, itemRectangle.Y + ItemPadding.Top,
itemRectangle.Width - ItemPadding.Right, itemRectangle.Height - ItemPadding.Bottom);
var itemTextInfo = GetTextInfo(context, GetItemName(item), textRectangle, HorizontalTextAlignment, VerticalTextAlignment);
return itemTextInfo;
}
private string GetItemName(object item)
{
if (item != null)
{
if (NameProperty != null)
{
return item.GetType()
.GetRuntimeProperty(NameProperty)
.GetValue(item)
?.ToString() ?? string.Empty;
}
return item.ToString();
}
return string.Empty;
}
protected Rectangle GetItemRectangle(IGuiContext context, int index, Rectangle contentRectangle)
{
var font = Font ?? context.DefaultFont;
var itemHeight = font.LineHeight + ItemPadding.Top + ItemPadding.Bottom;
return new Rectangle(contentRectangle.X, contentRectangle.Y + itemHeight * index, contentRectangle.Width, itemHeight);
}
protected void ScrollIntoView(IGuiContext context)
{
var contentRectangle = GetListAreaRectangle(context);
var selectedItemRectangle = GetItemRectangle(context, SelectedIndex - FirstIndex, contentRectangle);
if (selectedItemRectangle.Bottom > ClippingRectangle.Bottom)
FirstIndex++;
if (selectedItemRectangle.Top < ClippingRectangle.Top && FirstIndex > 0)
FirstIndex--;
}
protected Size GetItemSize(IGuiContext context, object item)
{
var text = GetItemName(item);
var font = Font ?? context.DefaultFont;
var textSize = (Size)font.MeasureString(text ?? string.Empty);
var itemWidth = textSize.Width + ItemPadding.Width;
var itemHeight = textSize.Height + ItemPadding.Height;
return new Size(itemWidth, itemHeight);
}
protected abstract Rectangle GetListAreaRectangle(IGuiContext context);
protected void DrawItemList(IGuiContext context, IGuiRenderer renderer)
{
var listRectangle = GetListAreaRectangle(context);
for (var i = FirstIndex; i < Items.Count; i++)
{
var item = Items[i];
var itemRectangle = GetItemRectangle(context, i - FirstIndex, listRectangle);
var itemTextInfo = GetItemTextInfo(context, itemRectangle, item);
var textColor = i == SelectedIndex ? SelectedTextColor : itemTextInfo.Color;
if (SelectedIndex == i)
renderer.FillRectangle(itemRectangle, SelectedItemColor, listRectangle);
renderer.DrawText(itemTextInfo.Font, itemTextInfo.Text, itemTextInfo.Position + TextOffset, textColor, itemTextInfo.ClippingRectangle);
}
}
}
}
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