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/*Copyright (c) 2011, Florent DEVILLE.                                      */
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using System.Reflection;

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

using GE.Manager;

namespace GE.Gui
{
    /// <summary>
    /// A text button widget.
    /// </summary>
    class WButton : Widget
    {
        /// <summary>
        /// Position.
        /// </summary>
        protected Vector2 m_position;

        /// <summary>
        /// Image.
        /// </summary>
        protected WImage m_image;

        /// <summary>
        /// Image when focused.
        /// </summary>
        protected WImage m_focusImage;

        /// <summary>
        /// Text.
        /// </summary>
        protected WText m_text;

        /// <summary>
        /// the button focus state.
        /// </summary>
        protected bool m_isFocused;

        /// <summary>
        /// Callback to invoke when clicked.
        /// </summary>
        protected MethodInfo m_clickCallback;

        /// <summary>
        /// Callback to invoke when focused.
        /// </summary>
        protected MethodInfo m_focusCallback;

        /// <summary>
        /// The focus state of the button.
        /// </summary>
        public bool IsFocused
        {
            get
            {
                return m_isFocused;
            }
            set
            {
                m_isFocused = value;
                if (value == true)
                {
                    if (m_focusCallback != null)
                        m_focusCallback.Invoke(m_owner, new object[] { });
                }
            }
        }

        /// <summary>
        /// Text.
        /// </summary>
        public string Text
        {
            get
            {
                return m_text.Text;
            }
            set
            {
                m_text.Text = value;
            }
        }

        public Vector2 Position
        {
            get
            {
                return m_position;
            }
        }

        /// <summary>
        /// Callback to invoke when clicked.
        /// </summary>
        public MethodInfo OnClick
        {
            set
            {
                m_clickCallback = value;
            }
        }

        /// <summary>
        /// Callback to invoke when focused.
        /// </summary>
        public MethodInfo OnFocus
        {
            set
            {
                m_focusCallback = value;
            }
        }

        /// <summary>
        /// Empty Constructor
        /// </summary>
        protected WButton()
        {
        }

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="owner">owner</param>
        /// <param name="text">test</param>
        /// <param name="color">text color</param>
        /// <param name="position">position</param>
        public WButton(Window owner, string text, Color color, Vector2 position)
        {
            m_owner = owner;
            m_position = position;
            m_isFocused = false;
            m_clickCallback = null;
            m_focusCallback = null;
            m_image = new WImage("Widget\\button_256_64", new Vector2(0f, 0f));
            m_focusImage = new WImage("Widget\\button_256_64_focus", new Vector2(0f, 0f));
            m_text = new WText(FontType.MenuButton, text, new Vector2(18f), color);
        }

        /// <summary>
        /// Render the widget.
        /// </summary>
        /// <param name="offset">position offset</param>
        public override void render(Vector2 offset)
        {
            base.render(offset);
            if (!m_isFocused)
                m_image.render(offset + m_position);
            else
                m_focusImage.render(offset + m_position);
            m_text.render(offset + m_position);
        }

        /// <summary>
        /// Click the widget.
        /// </summary>
        public void click()
        {
            if(m_clickCallback != null)
                m_clickCallback.Invoke(m_owner, new object[] {});
        }
    }
}
