我想知道是否有人能向我展示一种在XNA中创建按钮的简单方法。
最好是一种在点击时添加功能的方法，以及一种轻松添加和删除功能的方法。
答案 0 :(得分：1)
我建议使用NeoForce Controls Library来解决与GUI相关的问题 - 它包含按钮，以及其他有用的GUI控件，包括弹出窗口，列表视图，组合框等。
如果您正在为学习体验编写按钮课程......那么，在寻求帮助之前，请尝试通过Google自己了解更多信息。
附录
这是我为按钮编写的一些代码。也许它可以作为一个起点。我在我的2D游戏引擎中使用它，因此它已经过调试和测试。
/// <summary>
/// A control that changes appearance when it is hovered over and triggers some effect when it is clicked
/// </summary>
public class EnigmaButton
{
/// <summary>
/// The method signature for notification when a button is clicked
/// </summary>
/// <param name="sender">EnigmaButton that was clicked</param>
public delegate void OnClickEvent(EnigmaButton sender);
/// <summary>
/// Types of textures used for Enigma Buttons
/// </summary>
public enum TextureType { Normal, Over, Press }
#region Variables
protected IVisualExposer m_ui;
protected Rectangle m_bounds;
IInputExposer m_input;
bool m_over = false, m_press = false, m_wasPressed = false;
Dictionary<TextureType, EnigmaResource<Texture2D>> m_textures;
string m_text, m_name;
EnigmaResource<SpriteFont> m_font;
int m_minTextShadow, m_maxTextShadow;
Color m_textTint;
public event OnClickEvent OnClick;
#endregion
/// <summary>
/// A control that changes appearance when it is hovered over and triggers some effect when it is clicked
/// </summary>
/// <param name="ui">Graphical assets</param>
/// <param name="input">Input exposer for mouse input and XBox controller input</param>
/// <param name="reader">XMLReader for the definition of the controller</param>
/// <param name="pos">Bounds of the controller</param>
public EnigmaButton(IVisualExposer ui, IInputExposer input, XmlReader reader, Rectangle pos)
{
m_ui = ui;
m_bounds = pos;
m_textures = new Dictionary<TextureType, EnigmaResource<Texture2D>>();
m_input = input;
Enabled = true;
#region Reading
string name;
bool started = false, insideText = false;
while (reader.Read())
{
if (reader.MoveToContent() == XmlNodeType.Element)
{
name = reader.Name.ToLower();
if (name == "button")
{
if (started)
throw new Exception("Already started.");
started = true;
m_name = reader.GetAttribute("name") ?? string.Empty;
}
else if (!started)
throw new Exception("Not started");
else if (name == "text")
{
m_font = new EnigmaResource<SpriteFont>();
m_font.Filepath = reader.GetAttribute("font");
string minShadow = reader.GetAttribute("minShadow"), maxShadow = reader.GetAttribute("maxShadow");
m_minTextShadow = minShadow != null ? int.Parse(minShadow) : 0;
m_maxTextShadow = maxShadow != null ? int.Parse(maxShadow) : 2;
m_text = reader.GetAttribute("text") ?? string.Empty;
insideText = true;
m_textTint = Color.White;
}
else if (name == "bounds")
{
insideText = false;
m_bounds = new Rectangle(int.Parse(reader.GetAttribute("x")), int.Parse(reader.GetAttribute("y")),
int.Parse(reader.GetAttribute("width")), int.Parse(reader.GetAttribute("height")));
}
else if (name == "texture")
{
insideText = false;
TextureType texType = (TextureType)Enum.Parse(typeof(TextureType), reader.GetAttribute("type"));
if (m_textures.ContainsKey(texType))
throw new Exception("A texture of type '" + texType.ToString() + "' cannot be registered twice");
EnigmaResource<Texture2D> res = new EnigmaResource<Texture2D>();
res.Filepath = reader.ReadString();
m_textures.Add(texType, res);
}
else if (name == "tint")
{
if (!insideText)
throw new Exception("Tints can only be for text");
float a, r, g, b;
string[] split = reader.ReadString().Split(',');
if (split.Length != 4)
throw new Exception("Colors must be RGBA");
r = float.Parse(split[0].Trim());
g = float.Parse(split[1].Trim());
b = float.Parse(split[2].Trim());
a = float.Parse(split[3].Trim());
m_textTint = new Color(r, g, b, a);
}
}
}
#endregion
if (!m_textures.ContainsKey(TextureType.Normal))
throw new Exception("A button must have at least a '" + TextureType.Normal.ToString() + "' texture");
}
#region Methods
public void Initialize()
{
}
public void LoadContent()
{
EnigmaResource<Texture2D> res;
for (int i = 0; i < m_textures.Count; i++)
{
res = m_textures[m_textures.ElementAt(i).Key];
res.Resource = m_ui.Content.Load<Texture2D>(res.Filepath);
m_textures[m_textures.ElementAt(i).Key] = res;
}
if (m_font.Filepath != null)
m_font.Resource = m_ui.Content.Load<SpriteFont>(m_font.Filepath);
}
public void Update(GameTime gameTime)
{
m_wasPressed = m_press;
m_over = m_bounds.Contains(m_input.MouseX, m_input.MouseY);
m_press = m_over ? m_wasPressed ? m_input.IsMouseLeftPressed || m_input.IsButtonPressed(Buttons.A) : m_input.IsMouseLeftTriggered || m_input.IsButtonTriggered(Buttons.A) : false;
if (!m_wasPressed && m_press && OnClick != null)
OnClick(this);
}
public void Draw(GameTime gameTime)
{
Texture2D toDraw = m_textures[TextureType.Normal].Resource;
if (Enabled)
{
if (m_press && m_textures.ContainsKey(TextureType.Press))
toDraw = m_textures[TextureType.Press].Resource;
else if (m_over && m_textures.ContainsKey(TextureType.Over))
toDraw = m_textures[TextureType.Over].Resource;
}
m_ui.SpriteBatch.Draw(toDraw, m_bounds, Enabled ? Color.White : Color.Gray);
if (m_font.Resource != null)
{
Vector2 pos = new Vector2(m_bounds.X, m_bounds.Y);
Vector2 size = m_font.Resource.MeasureString(m_text);
pos.X += (m_bounds.Width - size.X) / 2;
pos.Y += (m_bounds.Height - size.Y) / 2;
UIHelper.DrawShadowedString(m_ui, m_font.Resource, m_text, pos, m_textTint, m_minTextShadow, m_maxTextShadow);
}
}
#endregion
#region Properties
/// <summary>
/// Gets or sets the name of the button
/// </summary>
public string Name
{
get { return m_name; }
set { m_name = value ?? m_name; }
}
/// <summary>
/// Gets or sets the text drawn in the button.
/// WARNING: Will overflow if the text does not normally fit.
/// </summary>
public string Text
{
get { return m_text; }
set { m_text = value ?? string.Empty; }
}
/// <summary>
/// Gets or sets the bounds of the button
/// </summary>
public Rectangle Bounds
{
get { return m_bounds; }
set { m_bounds = value; }
}
/// <summary>
/// Whether or not the control is enabled
/// </summary>
public bool Enabled { get; set; }
#endregion
}