带有标题和内容的 UserControl - 允许在内容面板中放置控件并防止在设计时在标题中放置控件 [英] UserControl with header and content - Allow dropping controls in content panel and Prevent dropping controls in header at design time

问题描述

我写了用户控制(耶！).但我希望它表现得像一个容器.可是等等！我知道

[Designer("System.Windows.Forms.Design.ParentControlDesigner, System.Design",typeof(IDesigner))]

诡计.

问题是 - 我不希望我的所有控件都像容器一样，而只是其中一部分.一个事实上的面板;)

为了提供更广泛的上下文:我编写了一个具有网格、一些常用按钮、标签和功能的控件.但它也有一部分用户应该放弃他的自定义按钮/控件.只在这个特定的部分控制，别无他处.

有人知道吗?

解决方案

你应该做到以下几点:

• 对于您的用户控件，您需要创建一个新的设计器，通过调用

  代码

  这里是解决方案不同元素的代码.

  您的用户控制

  [Designer(typeof(MyUserControlDesigner))]公共部分类 MyUserControl:UserControl{公共 MyUserControl(){初始化组件()；TypeDescriptor.AddAttributes(this.panel1,新的 DesignerAttribute(typeof(MyPanelDesigner)));}[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]公共面板 ContentsPanel{得到{返回面板1；}}}

  内面板设计器

  公共类 MyPanelDesigner : ParentControlDesigner{公共覆盖 SelectionRules SelectionRules{得到{选择规则 selectionRules = base.SelectionRules;selectionRules &= ~SelectionRules.AllSizeable;返回选择规则；}}protected override void PostFilterAttributes(IDictionary 属性){base.PostFilterAttributes(属性)；属性[typeof(DockingAttribute)] =新的对接属性(对接行为.从不)；}受保护的覆盖无效 PostFilterProperties(IDictionary 属性){base.PostFilterProperties(属性)；var propertiesToRemove = 新字符串 [] {码头"，锚点"，尺寸"，位置"，宽度"，高度"，MinimumSize"、MaximumSize"、AutoSize"、AutoSizeMode"、可见"、启用"、};foreach(propertiesToRemove 中的 var 项){如果(属性.包含(项目))属性[项目] = TypeDescriptor.CreateProperty(this.Component.GetType(),(PropertyDescriptor)properties[item],新的 BrowsableAttribute(false));}}}

  用户控件设计器

  公共类 MyUserControlDesigner : ParentControlDesigner{公共覆盖无效初始化(IComponent 组件){base.Initialize(组件);var contentsPanel = ((MyUserControl)this.Control).ContentsPanel;this.EnableDesignMode(contentsPanel, "ContentsPanel");}public override bool CanParent(Control control){返回假；}受保护的覆盖无效 OnDragOver(DragEventArgs de){de.Effect = DragDropEffects.None;}protected override IComponent[] CreateToolCore(ToolboxItem tool, int x,int y, int width, int height, bool hasLocation, bool hasSize){返回空值；}}

  I wrote User Control (yay!). But I want it to behave as a container. But wait! I know about

  [Designer("System.Windows.Forms.Design.ParentControlDesigner, System.Design", 
      typeof(IDesigner))]
  

  Trick.

  The problem is - I don't want all of my control to behave like container, but only one part. One - de facto - panel ;)

  To give wider context: I wrote a control that has Grid, some common buttons, labels and functionalities. But it also has a part where the user is supposed to drop his custom buttons/controls whatever. Only in this particular part of the control, nowhere else.

  Anyone had any idea?

  解决方案

  You should do the following :

  • For your user control, you need to create a new designer which enables the inner panel on design-time by calling EnableDesignMode method.
  • For the inner panel, you need to create a designer which disables moving, resizing and removes some properties from designer.
  • You should register the designers.

  Example

  You can read a blog post about this topic here and clone or download a working example:

  • r-aghaei/ChildContainerControlDesignerSample
  • Download Zip

  Code

  Here is the code for different elements of the solution.

  Your user control

  [Designer(typeof(MyUserControlDesigner))]
  public partial class MyUserControl : UserControl
  {
      public MyUserControl()
      {
          InitializeComponent();
          TypeDescriptor.AddAttributes(this.panel1,
              new DesignerAttribute(typeof(MyPanelDesigner)));
      }
      [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
      public Panel ContentsPanel
      {
          get { return panel1; }
      }
  }
  

  Designer for the inner panel

  public class MyPanelDesigner : ParentControlDesigner
  {
      public override SelectionRules SelectionRules
      {
          get
          {
              SelectionRules selectionRules = base.SelectionRules;
              selectionRules &= ~SelectionRules.AllSizeable;
              return selectionRules;
          }
      }
      protected override void PostFilterAttributes(IDictionary attributes)
      {
          base.PostFilterAttributes(attributes);
          attributes[typeof(DockingAttribute)] = 
              new DockingAttribute(DockingBehavior.Never);
      }
      protected override void PostFilterProperties(IDictionary properties)
      {
          base.PostFilterProperties(properties);
          var propertiesToRemove = new string[] {
              "Dock", "Anchor", "Size", "Location", "Width", "Height",
              "MinimumSize", "MaximumSize", "AutoSize", "AutoSizeMode",
              "Visible", "Enabled",
          };
          foreach (var item in propertiesToRemove)
          {
              if (properties.Contains(item))
                  properties[item] = TypeDescriptor.CreateProperty(this.Component.GetType(),
                      (PropertyDescriptor)properties[item],
                      new BrowsableAttribute(false));
          }
      }
  }
  

  Designer for your user control

  public class MyUserControlDesigner : ParentControlDesigner
  {
      public override void Initialize(IComponent component)
      {
          base.Initialize(component);
          var contentsPanel = ((MyUserControl)this.Control).ContentsPanel;
          this.EnableDesignMode(contentsPanel, "ContentsPanel");
      }
      public override bool CanParent(Control control)
      {
          return false;
      }
      protected override void OnDragOver(DragEventArgs de)
      {
          de.Effect = DragDropEffects.None;
      }
      protected override IComponent[] CreateToolCore(ToolboxItem tool, int x,
          int y, int width, int height, bool hasLocation, bool hasSize)
      {
          return null;
      }
  }
  

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