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Question

我有一个用户控件，我需要在运行时手动调整大小，尽管我希望应用边距。 我从下面的链接1中发现，为了使margin发挥作用，AutoSize属性需要被设置为true.虽然，由于我需要在运行时手动调整控件的大小，AutoSize属性对我来说需要为false。 虽然，由于我需要在运行时手动调整控件的大小，但根据我的理解，AutoSize属性需要为false。

用户控件（Accordion）包含一个水平分割的面板，其中第一个面板包含一个按钮，第二个面板包含一个面板控件。在下图中，你可以看到多个 "Accordions"，在图片中，就是其中一个按钮。这些Accordions停靠在容器的顶部。其目的是当我点击按钮时，它会调整大小，并显示 "内容面板 "和内容面板的控件。我的问题是，设置用户控件的margin属性并不能使它们自动与其他控件或它们所在的容器保持距离。

链接1: WinForm的底边距属性没有任何作用

希望能把我工作中的一些有用的片段。

namespace CustomControls
{
partial class Accordion
{
    /// <summary> 
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary> 
    /// Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    #region Component Designer generated code

    /// <summary> 
    /// Required method for Designer support - do not modify 
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.split = new System.Windows.Forms.SplitContainer();
        this.ToggleCollapse = new System.Windows.Forms.PictureBox();
        this.MainButton = new System.Windows.Forms.Button();
        this.contentsPanel = new System.Windows.Forms.Panel();
        ((System.ComponentModel.ISupportInitialize)(this.split)).BeginInit();
        this.split.Panel1.SuspendLayout();
        this.split.Panel2.SuspendLayout();
        this.split.SuspendLayout();
        ((System.ComponentModel.ISupportInitialize)(this.ToggleCollapse)).BeginInit();
        this.SuspendLayout();
        // 
        // split
        // 
        this.split.Dock = System.Windows.Forms.DockStyle.Fill;
        this.split.FixedPanel = System.Windows.Forms.FixedPanel.Panel1;
        this.split.IsSplitterFixed = true;
        this.split.Location = new System.Drawing.Point(0, 0);
        this.split.Margin = new System.Windows.Forms.Padding(3, 3, 3, 10);
        this.split.Name = "split";
        this.split.Orientation = System.Windows.Forms.Orientation.Horizontal;
        // 
        // split.Panel1
        // 
        this.split.Panel1.Controls.Add(this.ToggleCollapse);
        this.split.Panel1.Controls.Add(this.MainButton);
        this.split.Panel1MinSize = 0;
        // 
        // split.Panel2
        // 
        this.split.Panel2.Controls.Add(this.contentsPanel);
        this.split.Size = new System.Drawing.Size(663, 488);
        this.split.SplitterDistance = 40;
        this.split.TabIndex = 0;
        // 
        // ToggleCollapse
        // 
        this.ToggleCollapse.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
        this.ToggleCollapse.BackColor = System.Drawing.SystemColors.ActiveCaption;
        this.ToggleCollapse.Enabled = false;
        this.ToggleCollapse.Image = global::CustomControls.Properties.Resources.TrianglePointer;
        this.ToggleCollapse.Location = new System.Drawing.Point(621, 13);
        this.ToggleCollapse.Name = "ToggleCollapse";
        this.ToggleCollapse.Size = new System.Drawing.Size(39, 24);
        this.ToggleCollapse.SizeMode = System.Windows.Forms.PictureBoxSizeMode.CenterImage;
        this.ToggleCollapse.TabIndex = 0;
        this.ToggleCollapse.TabStop = false;
        // 
        // MainButton
        // 
        this.MainButton.AutoEllipsis = true;
        this.MainButton.BackColor = System.Drawing.SystemColors.ActiveCaption;
        this.MainButton.Dock = System.Windows.Forms.DockStyle.Fill;
        this.MainButton.FlatAppearance.BorderColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(255)))), ((int)(((byte)(192)))));
        this.MainButton.FlatAppearance.BorderSize = 3;
        this.MainButton.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
        this.MainButton.Font = new System.Drawing.Font("Verdana", 18F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.MainButton.ImageAlign = System.Drawing.ContentAlignment.MiddleRight;
        this.MainButton.Location = new System.Drawing.Point(0, 0);
        this.MainButton.Name = "MainButton";
        this.MainButton.Size = new System.Drawing.Size(663, 40);
        this.MainButton.TabIndex = 0;
        this.MainButton.Text = "Accordion Activator";
        this.MainButton.TextAlign = System.Drawing.ContentAlignment.BottomLeft;
        this.MainButton.UseVisualStyleBackColor = false;
        this.MainButton.MouseDown += new System.Windows.Forms.MouseEventHandler(this.MainButton_MouseDown);
        this.MainButton.MouseEnter += new System.EventHandler(this.MainButton_MouseEnter);
        this.MainButton.MouseLeave += new System.EventHandler(this.MainButton_MouseLeave);
        this.MainButton.MouseUp += new System.Windows.Forms.MouseEventHandler(this.MainButton_MouseUp);
        // 
        // contentsPanel
        // 
        this.contentsPanel.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.contentsPanel.Dock = System.Windows.Forms.DockStyle.Fill;
        this.contentsPanel.Location = new System.Drawing.Point(0, 0);
        this.contentsPanel.Name = "contentsPanel";
        this.contentsPanel.Size = new System.Drawing.Size(663, 444);
        this.contentsPanel.TabIndex = 0;
        this.contentsPanel.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Panel_MouseDown);
        this.contentsPanel.MouseLeave += new System.EventHandler(this.Panel_MouseLeave);
        this.contentsPanel.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Panel_MouseMove);
        this.contentsPanel.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Panel_MouseUp);
        // 
        // Accordion
        // 
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Inherit;
        this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
        this.Controls.Add(this.split);
        this.DoubleBuffered = true;
        this.Margin = new System.Windows.Forms.Padding(3, 3, 3, 10);
        this.Name = "Accordion";
        this.Size = new System.Drawing.Size(663, 488);
        this.split.Panel1.ResumeLayout(false);
        this.split.Panel2.ResumeLayout(false);
        ((System.ComponentModel.ISupportInitialize)(this.split)).EndInit();
        this.split.ResumeLayout(false);
        ((System.ComponentModel.ISupportInitialize)(this.ToggleCollapse)).EndInit();
        this.ResumeLayout(false);

    }

    #endregion

    private System.Windows.Forms.SplitContainer split;
    private System.Windows.Forms.Button MainButton;
    private System.Windows.Forms.PictureBox ToggleCollapse;
    protected System.Windows.Forms.Panel contentsPanel;
}
}

这是我手动调整大小的时间和方式

       public bool Collapsed
       {
        get
        {
            return split.Panel2Collapsed;
        }
        set
        {
            Freeze(true);
            if (Dock == DockStyle.Fill && this.DesignMode)
            {
                if (firstResize)
                {
                    if (value)
                        this.Parent.Height = MainButtonHeight;
                    else
                        this.Parent.Height = ExpandedHeight;
                }
                else
                {
                    if (value)
                        CollapseAnimation(1);
                    else
                        ExpandAnimation(5);
                }
            }
            else
            {
                if (firstResize)
                {
                    if (value)
                        this.Height = MainButtonHeight;
                    else
                        this.Height = ExpandedHeight;
                    if (loadBegan)
                        firstResize = !firstResize;
                }
                else
                {
                    if (value)
                        CollapseAnimation(1);
                    else
                        ExpandAnimation(5);
                }
            }
            split.Panel2Collapsed = value;
            ToggleCollapse.Image = toggleImageNeutral;
            Freeze(false);
        }
    }

Answer 1

不确定我是否完全理解了你的问题，但也许这可以帮助你。如果你想在调整大小后，你的控件周围有一个固定的边距（由于SplitContainer面板的扩展和折叠），你可以试试这个。

• 在你的空白用户控件上拖动一个Panel控件，并将其Margin设置为(0,0,0,0)，Padding设置为(x,x,x,x)，其中x是你想要的边距宽度。

在对子控件的高度进行计算以调整控件的大小时要小心，如果你在一些子控件上设置了paddings和margins，一定要把它们考虑进去。

更新一下。

正如这里所说。https:/docs.microsoft.comen-usdotnetapisystem.windows.forms.control.margin?view=netframework-4.8。

"在停靠的控件上设置Margin属性，对控件与容器边缘的距离没有影响。"

所以，我认为你必须选择一个特定的容器，比如TableLayoutPanel或FlowLayoutPanel。试着用一个FlowLayoutPanel并像这样设置。

• AutoSize = true;
• BorderStyle = FixedSingle (只是想看看是否能正确地保持边距)
• 流动方向 = 自上而下

然后将一些控件拖入其中，并将 AutoSize 属性设置为 false，将 Margin 设置为你喜欢的值。你应该得到这样的东西。

注意：你的控件的高度可能仍然会被改变（也许设置一个最小的控件高度可以起到帮助作用），但是一旦你设置了它们的宽度，FlowLayoutPanel控件就不能因为margin而切割控件。