使用Tahoma，TextRenderingHint.ClearTypeGridFit和AutoSize（WindowsXP）组合进行Label控件

Question

使用AutoSize标签的问题是Tahoma字体使用选项TextRenderingHint.ClearTypeGridFit绘制的。 没有ClearTypeGridFit它看起来没问题，但是 - 它被父容器裁剪（参见附图：第一个标签'，'被裁剪）

我发现它只有Tahoma字体。

自定义标签代码：

class CustomLabel: Label
{
    public CustomLabel ()
        :base()
    {
    }

    protected override void OnPaint ( PaintEventArgs e )
    {
        e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
        base.OnPaint( e );            
    }
}

来自设计师档案的代码和平：

        // 
        // label1
        // 
        this.label1.AutoSize = true;
        this.label1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.label1.Font = new System.Drawing.Font( "Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ( (byte)( 0 ) ) );
        this.label1.Location = new System.Drawing.Point( 54, 95 );
        this.label1.Name = "label1";
        this.label1.Size = new System.Drawing.Size( 35, 13 );
        this.label1.TabIndex = 1;
        this.label1.Text = resources.GetString( "label1.Text" );
        // 
        // customLabel1
        // 
        this.customLabel1.AutoSize = true;
        this.customLabel1.BackColor = System.Drawing.Color.NavajoWhite;
        this.customLabel1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.customLabel1.Font = new System.Drawing.Font( "Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ( (byte)( 0 ) ) );
        this.customLabel1.ForeColor = System.Drawing.Color.Black;
        this.customLabel1.Location = new System.Drawing.Point( 1, 1 );
        this.customLabel1.Margin = new System.Windows.Forms.Padding( 0 );
        this.customLabel1.Name = "customLabel1";
        this.customLabel1.Size = new System.Drawing.Size( 192, 154 );
        this.customLabel1.TabIndex = 0;
        this.customLabel1.Text = resources.GetString( "customLabel1.Text" );

我发现只是重写了一个GetPreferedSize函数：

    public override Size GetPreferredSize ( Size theProposedSize )
    {            
        if ( TextRendering == TextRenderingHint.ClearTypeGridFit )
        {
            Graphics aGraphics = Graphics.FromHwnd( this.Handle );
            if ( aGraphics != null )
            {
                aGraphics.TextRenderingHint = theTextRendering;
                Size aResult = TextRenderer.MeasureText( aGraphics, Text, Font, theProposedSize );
                //apply control minimum size
                aResult.Height = Math.Max( aResult.Height, MinimumSize.Height );
                aResult.Width = Math.Max( aResult.Width, MinimumSize.Width );
                return aResult;
            }
        }

        return base.GetPreferredSize( theProposedSize );
    }

但是我无法对结果应用最大大小。 为什么我需要最大尺寸？例如，我希望有可能按宽度限制标签。

有什么想法吗？

Answer 1

所以，我的最终解决方案看起来如此：

    public override Size GetPreferredSize ( Size theProposedSize )
    {
        if ( SystemInfo.WinVersion == SystemInfo.Version.WindowsXP )
        {
            if ( theTextRendering == TextRenderingHint.ClearTypeGridFit )
            {
                Graphics aGraphics = Graphics.FromHwnd( this.Handle );
                if ( aGraphics != null )
                {
                    aGraphics.TextRenderingHint = theTextRendering;
                    Size aResult = TextRenderer.MeasureText( aGraphics, Text, Font, theProposedSize );
                    //apply padding and margin
                    aResult.Width += Margin.Horizontal + Padding.Horizontal;
                    aResult.Height += Margin.Vertical + Padding.Vertical;
                    //apply control minimum size
                    aResult.Height = Math.Max( aResult.Height, MinimumSize.Height );
                    aResult.Width = Math.Max( aResult.Width, MinimumSize.Width );

                    //adopt maximum width
                    if ( MaximumSize.Width > 0 )
                    {
                        while ( aResult.Width > MaximumSize.Width )
                        {
                            aResult.Width -= MaximumSize.Width;
                            aResult.Height += Font.Height;
                            if ( aResult.Width < MaximumSize.Width )
                            {
                                aResult.Width = MaximumSize.Width;
                            }
                        }
                    }

                    return aResult;
                }
            }
        }

        return base.GetPreferredSize( theProposedSize );
    }