C#在设计时如何实现拖放自定义控件？

zhoutiance 2007-09-07 02:49:02

想实现这样一个功能：在设计时拖放可以同时放入多个控件，放入控件后，自动更改控件的属性（要更改的值是已知的）
举个例子，拖放一个项目后，自动在界面上生成一个Label和一个TextBox，Label的Text显示为AAA，TextBox的Text显示为BBB。
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zhoutiance 2007-09-27

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感谢啊！

PTPVP 2007-09-25

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.net 2.0下可以用下面的方法：

创建一个自定义控件包含Label和TextBox，自定义一个DesignSurface：
class myDesignerSurface : DesignSurface
{
public myDesignerSurface()
{
myToolBox toolBox = new myToolBox();
this.ServiceContainer.AddService(typeof(IToolboxService), toolBox);
this.ServiceContainer.AddService(typeof(INameCreationService),
new NameCreationService());
}
}

NameCreationService类实现INameCreationService接口。

写一个myToolBox类，继承ListBox和IToolboxService。用他来存放自定义控件

class myToolBox : ListBox, IToolboxService

{

private IDesignerHost m_designerHost;

public IDesignerHost DesignerHost

{

set { m_designerHost = value; }

get { return m_designerHost; }

}

public myToolBox()

{

this.DrawMode = DrawMode.OwnerDrawFixed;

this.SelectionMode = SelectionMode.One;

this.populateItems();

}

private void populateItems()

{

this.Items.Add(typeof(Button));

this.Items.Add(typeof(TextBox));

this.Items.Add(typeof(MonthCalendar));

this.Items.Add(typeof(RichTextBox));

//......

}

protected override void OnDrawItem(DrawItemEventArgs e)

{

e.DrawBackground();

Type type = this.Items[e.Index] as Type;

System.Drawing.ToolboxBitmapAttribute tba =

TypeDescriptor.GetAttributes(type)[typeof(System.Drawing.ToolboxBitmapAttribute)]

as System.Drawing.ToolboxBitmapAttribute;

Bitmap bmp = (System.Drawing.Bitmap)tba.GetImage(type);

Rectangle imgRect = e.Bounds;

imgRect.Width = 17;

e.Graphics.DrawImage(bmp, imgRect);

Rectangle rect = e.Bounds;

rect.X += 17;

e.Graphics.DrawString(type.Name, e.Font, new SolidBrush(e.ForeColor), rect);

base.OnDrawItem(e);

}

protected override void OnMouseDown(MouseEventArgs e)

{

if (this.SelectedIndex != -1)

{

Type type = this.SelectedItem as Type;

ToolboxItem tbi = new ToolboxItem(type);

// The IToolboxService serializes ToolboxItems by packaging them in DataObjects.

DataObject d = this.SerializeToolboxItem(tbi) as DataObject;

try

{

this.DoDragDrop(d, DragDropEffects.Copy);

}

catch { }

}

base.OnMouseDown(e);

}

#region IToolboxService Members

public System.Drawing.Design.ToolboxItem DeserializeToolboxItem(object serializedObject, IDesignerHost host)

{

ToolboxItem tbi = (ToolboxItem)((DataObject)serializedObject).GetData

(typeof(System.Drawing.Design.ToolboxItem));

myUserControl uc = new myUserControl();

uc.ControlName = "something";

uc.ControlText = "something";

return new ToolboxItem(typeof(myUserControl));

}

//

}

///郁闷的排版。。。。

这样的方法应该可以实现你想要的功能。

Miamiiii 2007-09-19

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学习

北京的雾霾天 2007-09-19

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通过用 .NET 生成自定义窗体设计器来定制应用程序

参考：
http://www.microsoft.com/china/MSDN/library/netFramework/netframework/CustomFormsDesigner.mspx?mfr=true

CustomFormsDesigner
下载地址：
http://download.microsoft.com/download/d/3/1/d31fff33-fd97-488f-9bbd-4b7402905716/CustomFormsDesigner.exe