基准对齐线定它控制

Question

我有一个自定义用户控制与一个文本在这和我想让的基线(文本在该文本)对齐线以外定制的控制。我知道，你创建的一个设计师(继承ControlDesigner)和复盖对齐线，以获得对齐线，但我想知道如何获得的文本基线的控制，我已经暴露我自定义用户的控制。

Answer 1

我只有一个类似的需要，和我解决了这样的：

 public override IList SnapLines
{
    get
    {
        IList snapLines = base.SnapLines;

        MyControl control = Control as MyControl;
        if (control == null) { return snapLines; }

        IDesigner designer = TypeDescriptor.CreateDesigner(
            control.textBoxValue, typeof(IDesigner));
        if (designer == null) { return snapLines; }
        designer.Initialize(control.textBoxValue);

        using (designer)
        {
            ControlDesigner boxDesigner = designer as ControlDesigner;
            if (boxDesigner == null) { return snapLines; }

            foreach (SnapLine line in boxDesigner.SnapLines)
            {
                if (line.SnapLineType == SnapLineType.Baseline)
                {
                    snapLines.Add(new SnapLine(SnapLineType.Baseline,
                        line.Offset + control.textBoxValue.Top,
                        line.Filter, line.Priority));
                    break;
                }
            }
        }

        return snapLines;
    }
}

这样，它实际上是创建一个临时的子的设计为的subcontrol，以便找出"真正的"基准对齐线。

这似乎是合理的高性能的测试，但是如果性能成为一个令人关注(以及如果内部文本没有移动)然后大多数的这些代码，可取的初始化的方法。

这还假定的文本是一个直接的儿童的用户控件.如果还有其他的布局影响控制的方式，然后在偏移计算变得更复杂一点。

Answer 2

作为一个更新的Miral的回答..这里是一些"缺失的步骤"，为新的人，在寻找如何做到这一点。:)C#码以上，几乎是'中'准备，例外的变数值为参考的用户控件，将进行修改。

可能的参考文献需要：
系统。设计(@robyaw)

Using需要：

using System.Windows.Forms.Design;
using System.Windows.Forms.Design.Behavior;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections;

在你的用户控件你需要下列属性：

[Designer(typeof(MyCustomDesigner))]

然后你需要一个"设计者"类，这将有对齐线复盖：

private class MyCustomerDesigner : ControlDesigner {
  public override IList SnapLines {
    get {
     /* Code from above */
    IList snapLines = base.SnapLines;

    // *** This will need to be modified to match your user control
    MyControl control = Control as MyControl;
    if (control == null) { return snapLines; }

    // *** This will need to be modified to match the item in your user control
    // This is the control in your UC that you want SnapLines for the entire UC
    IDesigner designer = TypeDescriptor.CreateDesigner(
        control.textBoxValue, typeof(IDesigner));
    if (designer == null) { return snapLines; }

    // *** This will need to be modified to match the item in your user control
    designer.Initialize(control.textBoxValue);

    using (designer)
    {
        ControlDesigner boxDesigner = designer as ControlDesigner;
        if (boxDesigner == null) { return snapLines; }

        foreach (SnapLine line in boxDesigner.SnapLines)
        {
            if (line.SnapLineType == SnapLineType.Baseline)
            {
                // *** This will need to be modified to match the item in your user control
                snapLines.Add(new SnapLine(SnapLineType.Baseline,
                    line.Offset + control.textBoxValue.Top,
                    line.Filter, line.Priority));
                break;
            }
        }
    }

    return snapLines;
}

    }
  }
}

Answer 3

感谢所有那些为帮助。这是一个很难下咽。想法有一个私人的子类在每一个用户控件是不是很可口。

我想出了这个基地的一流的帮助。

[Designer(typeof(UserControlSnapLineDesigner))]
public class UserControlBase : UserControl
{
    protected virtual Control SnapLineControl { get { return null; } }

    private class UserControlSnapLineDesigner : ControlDesigner
    {
        public override IList SnapLines
        {
            get
            {
                IList snapLines = base.SnapLines;

                Control targetControl = (this.Control as UserControlBase).SnapLineControl;

                if (targetControl == null)
                    return snapLines;

                using (ControlDesigner controlDesigner = TypeDescriptor.CreateDesigner(targetControl,
                    typeof(IDesigner)) as ControlDesigner)
                {
                    if (controlDesigner == null)
                        return snapLines;

                    controlDesigner.Initialize(targetControl);

                    foreach (SnapLine line in controlDesigner.SnapLines)
                    {
                        if (line.SnapLineType == SnapLineType.Baseline)
                        {
                            snapLines.Add(new SnapLine(SnapLineType.Baseline, line.Offset + targetControl.Top,
                                line.Filter, line.Priority));
                            break;
                        }
                    }
                }
                return snapLines;
            }
        }
    }
}

接下来，推导出你的用户控件，从这个基础：

public partial class MyControl : UserControlBase
{
    protected override Control SnapLineControl
    {
        get
        {
            return txtTextBox;
        }
    }

    ...

}

再次感谢布这一点。

Answer 4

VB.Net 版本：
注：你必须要改变 txtDescription 文本框或另一种内部控制的名称使用。和 ctlUserControl 你的 usercontrol 名称

<Designer(GetType(ctlUserControl.MyCustomDesigner))> _
Partial Public Class ctlUserControl
   '... 
   'Your Usercontrol class specific code
   '... 
    Class MyCustomDesigner
        Inherits ControlDesigner
        Public Overloads Overrides ReadOnly Property SnapLines() As IList
            Get
                ' Code from above 

                Dim lines As IList = MyBase.SnapLines

                ' *** This will need to be modified to match your user control
                Dim control__1 As ctlUserControl = TryCast(Me.Control, ctlUserControl)
                If control__1 Is Nothing Then Return lines

                ' *** This will need to be modified to match the item in your user control
                ' This is the control in your UC that you want SnapLines for the entire UC
                Dim designer As IDesigner = TypeDescriptor.CreateDesigner(control__1.txtDescription, GetType(IDesigner))
                If designer Is Nothing Then
                    Return lines
                End If

                ' *** This will need to be modified to match the item in your user control
                designer.Initialize(control__1.txtDescription)

                Using designer
                    Dim boxDesigner As ControlDesigner = TryCast(designer, ControlDesigner)
                    If boxDesigner Is Nothing Then
                        Return lines
                    End If

                    For Each line As SnapLine In boxDesigner.SnapLines
                        If line.SnapLineType = SnapLineType.Baseline Then
                            ' *** This will need to be modified to match the item in your user control
                            lines.Add(New SnapLine(SnapLineType.Baseline, line.Offset + control__1.txtDescription.Top, line.Filter, line.Priority))
                            Exit For
                        End If
                    Next
                End Using

                Return lines
            End Get
        End Property
    End Class

End Class

Answer 5

你在正确的轨道。你会需要复盖对齐线的财产在你designr和做事情是这样的：

Public Overrides ReadOnly Property SnapLines() As System.Collections.IList
    Get
        Dim snapLinesList As ArrayList = TryCast(MyBase.SnapLines, ArrayList)

        Dim offset As Integer
        Dim ctrl As MyControl = TryCast(Me.Control, MyControl)
        If ctrl IsNot Nothing AndAlso ctrl.TextBox1 IsNot Nothing Then
            offset = ctrl.TextBox1.Bottom - 5
        End If

        snapLinesList.Add(New SnapLine(SnapLineType.Baseline, offset, SnapLinePriority.Medium))

        Return snapLinesList

    End Get
End Property

这个例子中的用户控件包含一个文本框。代码增加一个新对齐线代表的基准，用于文本框中。重要的是计算偏移是否正确。