C#.NET Winforms:是不是可以覆盖 Label.Autosize?
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【中文标题】C#.NET Winforms:是不是可以覆盖 Label.Autosize?【英文标题】:C#.NET Winforms: Is it possible to override Label.Autosize?C#.NET Winforms:是否可以覆盖 Label.Autosize? 【发布时间】:2010-09-06 17:08:48 【问题描述】:我不喜欢 Label 控件的 AutoSize 属性。我有一个自定义标签,它在其他东西中绘制了一个精美的圆形边框。我在构造函数中放置了AutoSize = false
,但是,当我将其置于设计模式时,该属性始终为 True。
我已经成功地覆盖了其他属性,但是这个很高兴地忽略了我。有人知道这是否是“由 MS 设计的”吗?
这是我的标签的完整源代码,以防有人感兴趣。
using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
namespace Dentactil.UI.WinControls
[DefaultProperty("TextString")]
[DefaultEvent("TextClick")]
public partial class RoundedLabel : UserControl
private static readonly Color DEFAULT_BORDER_COLOR = Color.FromArgb( 132, 100, 161 );
private const float DEFAULT_BORDER_WIDTH = 2.0F;
private const int DEFAULT_ROUNDED_WIDTH = 16;
private const int DEFAULT_ROUNDED_HEIGHT = 12;
private Color mBorderColor = DEFAULT_BORDER_COLOR;
private float mBorderWidth = DEFAULT_BORDER_WIDTH;
private int mRoundedWidth = DEFAULT_ROUNDED_WIDTH;
private int mRoundedHeight = DEFAULT_ROUNDED_HEIGHT;
public event EventHandler TextClick;
private Padding mPadding = new Padding(8);
public RoundedLabel()
InitializeComponent();
public Cursor TextCursor
get return lblText.Cursor;
set lblText.Cursor = value;
public Padding TextPadding
get return mPadding;
set
mPadding = value;
UpdateInternalBounds();
public ContentAlignment TextAlign
get return lblText.TextAlign;
set lblText.TextAlign = value;
public string TextString
get return lblText.Text;
set lblText.Text = value;
public override Font Font
get return base.Font;
set
base.Font = value;
lblText.Font = value;
public override Color ForeColor
get return base.ForeColor;
set
base.ForeColor = value;
lblText.ForeColor = value;
public Color BorderColor
get return mBorderColor;
set
mBorderColor = value;
Invalidate();
[DefaultValue(DEFAULT_BORDER_WIDTH)]
public float BorderWidth
get return mBorderWidth;
set
mBorderWidth = value;
Invalidate();
[DefaultValue(DEFAULT_ROUNDED_WIDTH)]
public int RoundedWidth
get return mRoundedWidth;
set
mRoundedWidth = value;
Invalidate();
[DefaultValue(DEFAULT_ROUNDED_HEIGHT)]
public int RoundedHeight
get return mRoundedHeight;
set
mRoundedHeight = value;
Invalidate();
private void UpdateInternalBounds()
lblText.Left = mPadding.Left;
lblText.Top = mPadding.Top;
int width = Width - mPadding.Right - mPadding.Left;
lblText.Width = width > 0 ? width : 0;
int heigth = Height - mPadding.Bottom - mPadding.Top;
lblText.Height = heigth > 0 ? heigth : 0;
protected override void OnLoad(EventArgs e)
UpdateInternalBounds();
base.OnLoad(e);
protected override void OnPaint(PaintEventArgs e)
SmoothingMode smoothingMode = e.Graphics.SmoothingMode;
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
int roundedWidth = RoundedWidth > (Width - 1)/2 ? (Width - 1)/2 : RoundedWidth;
int roundedHeight = RoundedHeight > (Height - 1)/2 ? (Height - 1)/2 : RoundedHeight;
GraphicsPath path = new GraphicsPath();
path.AddLine(0, roundedHeight, 0, Height - 1 - roundedHeight);
path.AddArc(new RectangleF(0, Height - 1 - 2*roundedHeight, 2*roundedWidth, 2*roundedHeight), 180, -90);
path.AddLine(roundedWidth, Height - 1, Width - 1 - 2*roundedWidth, Height - 1);
path.AddArc(new RectangleF(Width - 1 - 2*roundedWidth, Height - 1 - 2*roundedHeight, 2*roundedWidth, 2*roundedHeight), 90, -90);
path.AddLine(Width - 1, Height - 1 - roundedHeight, Width - 1, roundedHeight);
path.AddArc(new RectangleF(Width - 1 - 2*roundedWidth, 0, 2*roundedWidth, 2*roundedHeight), 0, -90);
path.AddLine(Width - 1 - roundedWidth, 0, roundedWidth, 0);
path.AddArc(new RectangleF(0, 0, 2*roundedWidth, 2*roundedHeight), -90, -90);
e.Graphics.DrawPath(new Pen(new SolidBrush(BorderColor), BorderWidth), path);
e.Graphics.SmoothingMode = smoothingMode;
base.OnPaint(e);
protected override void OnResize(EventArgs e)
UpdateInternalBounds();
base.OnResize(e);
private void lblText_Click(object sender, EventArgs e)
if (TextClick != null)
TextClick(this, e);
(Stack Overflow 的标记和下划线存在一些问题,但很容易按照代码进行操作)。
实际上,当我看到它不起作用时,我实际上已经删除了该覆盖。我现在再次添加并测试。基本上我想用一些新标签替换标签:IWillNotAutoSizeLabel ;)
我基本上讨厌“默认开启”的 autosize 属性。
【问题讨论】:
【参考方案1】:在表单本身的构造函数中设置控件的某些属性时,我看到了类似的行为。他们似乎恢复了设计时的默认设置。
我注意到您已经覆盖了 OnLoad 方法。您是否尝试在那里设置 AutoSize = false ?还是您主要关心提供 default false 值?
【讨论】:
【参考方案2】:我花了很多时间,终于成功了! (我的代码是 vb.net 但转换起来很简单)
Private _Autosize As Boolean
Public Sub New()
_Autosize=False
End Sub
Public Overrides Property AutoSize() As Boolean
Get
Return MyBase.AutoSize
End Get
Set(ByVal Value As Boolean)
If _Autosize <> Value And _Autosize = False Then
MyBase.AutoSize = False
_Autosize = Value
Else
MyBase.AutoSize = Value
End If
End Set
End Property
【讨论】:
【参考方案3】:您的问题可能是您实际上并没有在代码中覆盖 Autosize(即,与覆盖 Font 或 ForeColor 的方式相同)。
【讨论】:
【参考方案4】:我在您的构造函数中没有看到this.AutoSize = false
。您的类被标记为部分 - 也许您在具有该行的另一个文件中有一个构造函数。 Visual Studio 设计器将调用您已获得的无参数构造函数。
【讨论】:
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