我正在设计一个简单的扩展器控件。
我从 UserControl 派生,绘制内部控件,构建,运行;一切都好。
由于内部控件是面板,我想在设计时将其用作容器。事实上,我已经使用了这些属性:
[Designer(typeof(ExpanderControlDesigner))]
[Designer("System.Windows.Forms.Design.ParentControlDesigner, System.Design", typeof(IDesigner))]
我说的太好了。但它不是...
结果是我可以在设计时将它用作容器但是:
- 添加的控件返回已经嵌入到用户控件中的内部控件
- 即使我将在设计时添加的控件推到顶部,在运行时它会再次回到嵌入到用户控件的控件上
- 我无法在设计时将容器区域限制为面板区域
我错过了什么?这是完整性代码...为什么这段代码不起作用?
[Designer(typeof(ExpanderControlDesigner))]
[Designer("System.Windows.Forms.Design.ParentControlDesigner, System.Design", typeof(IDesigner))]
public partial class ExpanderControl : UserControl
{
public ExpanderControl()
{
InitializeComponent();
....
[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
internal class ExpanderControlDesigner : ControlDesigner
{
private ExpanderControl MyControl;
public override void Initialize(IComponent component)
{
base.Initialize(component);
MyControl = (ExpanderControl)component;
// Hook up events
ISelectionService s = (ISelectionService)GetService(typeof(ISelectionService));
IComponentChangeService c = (IComponentChangeService)GetService(typeof(IComponentChangeService));
s.SelectionChanged += new EventHandler(OnSelectionChanged);
c.ComponentRemoving += new ComponentEventHandler(OnComponentRemoving);
}
private void OnSelectionChanged(object sender, System.EventArgs e)
{
}
private void OnComponentRemoving(object sender, ComponentEventArgs e)
{
}
protected override void Dispose(bool disposing)
{
ISelectionService s = (ISelectionService)GetService(typeof(ISelectionService));
IComponentChangeService c = (IComponentChangeService)GetService(typeof(IComponentChangeService));
// Unhook events
s.SelectionChanged -= new EventHandler(OnSelectionChanged);
c.ComponentRemoving -= new ComponentEventHandler(OnComponentRemoving);
base.Dispose(disposing);
}
public override System.ComponentModel.Design.DesignerVerbCollection Verbs
{
get
{
DesignerVerbCollection v = new DesignerVerbCollection();
v.Add(new DesignerVerb("&asd", new EventHandler(null)));
return v;
}
}
}
我找到了很多资源( Interaction 、 designed 、 limited area ),但没有任何资源可用于操作...
实际上有一个技巧,因为可以设计 System.Windows.Forms 类(像往常一样)并在运行时具有正确的行为(例如 TabControl)。
最佳答案
ParentControlDesigner 不知道您要做什么。它只知道您希望 UserControl 成为容器。
您需要做的是实现您自己的设计器,在面板上启用设计模式:
using System.ComponentModel;
using System.Windows.Forms;
using System.Windows.Forms.Design;
namespace MyCtrlLib
{
// specify my custom designer
[Designer(typeof(MyCtrlLib.UserControlDesigner))]
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}
// define a property called "DropZone"
[Category("Appearance")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public Panel DropZone
{
get { return panel1; }
}
}
// my designer
public class UserControlDesigner : ParentControlDesigner
{
public override void Initialize(System.ComponentModel.IComponent component)
{
base.Initialize(component);
if (this.Control is UserControl1)
{
this.EnableDesignMode(
(UserControl1)this.Control).DropZone, "DropZone");
}
}
}
}
这是我从 Henry Minute 学到的在 CodeProject 上。有关该技术的一些改进,请参阅链接。
关于c# - 用户控件在设计时作为容器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2694889/