ITypeDescriptorFilterService 接口
提供在设计模式下修改组件的成员说明符集的接口。
**命名空间:**System.ComponentModel.Design
**程序集:**System（在 system.dll 中）
语法
声明
Public Interface ITypeDescriptorFilterService
用法
Dim instance As ITypeDescriptorFilterService
public interface ITypeDescriptorFilterService
public interface class ITypeDescriptorFilterService
public interface ITypeDescriptorFilterService
public interface ITypeDescriptorFilterService
备注
ITypeDescriptorFilterService 接口提供允许在设计时对组件的属性 (Property)、事件、类级属性 (Attribute) 进行修改的接口。此修改在组件通过 TypeDescriptor 提供的说明符集内发生。类型说明符将在组件的站点中查询 ITypeDescriptorFilterService 服务，如果存在，类型说明符会将它收集的所有元数据传递给此服务。然后，服务可以通过添加、移除和更改组件的现有特征来修改元数据。
例如，组件的属性 (Property) 可以通过调用 FilterProperties 方法来进行修改。筛选服务获取包含 PropertyDescriptor 类型的属性 (Property) 名称及其属性 (Property) 说明符的字典。修改将通过下列逻辑实现。
修改 |
实现 |
|---|---|
移除 |
删除字典中的对应条目。 |
添加 |
在字典中添加适当的条目。 |
更改 |
调用现有的属性 (Property) 说明符方法，替换关联的属性 (Property) 说明符条目，或替换字典中的整个属性 (Property) 键/值对。 |
FilterProperties 的返回值确定此组属性 (Property) 是否已固定。如果此方法返回 true，则此组件的 TypeDescriptor 可以缓存结果。此缓存将保留到组件被垃圾回收或类型说明符的 Refresh 方法被调用。
给实现者的说明 若要筛选由 TypeDescriptor 公开的成员说明符，请在一个组件上实现此接口，然后重写此类的 FilterAttributes、FilterEvents 或 FilterProperties 方法，以分别筛选属性 (Attribute)、事件或属性 (Property)。
示例
下面的代码示例演示一个设计器，该设计器使用 ITypeDescriptorFilterService 来筛选任何新的或现有 Button 的属性 (Attribute) 集合，以便在加载或重新加载按钮的设计器之前，为新设计器添加设计器属性 (Attribute)。
要使用该示例，请将代码添加到 Windows 窗体项目并将组件从类库加载到工具箱中。
演练：使用自定义组件自动填充工具箱
演练：使用自定义组件自动填充工具箱
演练：使用自定义组件自动填充工具箱
演练：使用自定义组件自动填充工具箱
给您的窗体添加一些按钮。将 ButtonDesignerFilterComponent 添加到窗体，它将在组件栏中显示。ButtonDesignerFilterComponent 将 ButtonDesignerFilterService（用于实现 ITypeDescriptorFilterService）添加为设计模式的服务提供程序。在 ButtonDesignerFilterService 将每个现有按钮及新按钮的设计器替换为 ColorCycleButtonDesigner 之后，窗体上的现有或新 Button 对象将开始颜色循环。将鼠标指针移动到这些按钮上时，它们将进行颜色循环，然后，或者继续循环，或者在发生 MouseLeave 事件时重置背景色和前景色。在释放 ButtonDesignerFilterComponent 并替换原始的 ITypeDescriptorFilterService 之前，将通过已加载的 ButtonDesignerFilterService 的 FilterAttributes 方法为新 Button 对象提供 ColorCycleButtonDesigner。此示例中的 ColorCycleButton 类是与 ColorCycleButtonDesigner 关联的 Button。
Imports System
Imports System.Collections
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.ComponentModel.Design.Serialization
Imports System.Drawing
Imports System.Reflection
Imports System.Timers
Imports System.Windows.Forms
Imports System.Windows.Forms.Design
Namespace ITypeDescriptorFilterSample
' Component to host the ButtonDesignerFilterComponentDesigner that loads the
' ButtonDesignerFilterService ITypeDescriptorFilterService.
<Designer(GetType(ButtonDesignerFilterComponentDesigner))> _
Public Class ButtonDesignerFilterComponent
Inherits System.ComponentModel.Component
Public Sub New(ByVal container As System.ComponentModel.IContainer)
container.Add(Me)
End Sub 'New
Public Sub New()
End Sub 'New
End Class 'ButtonDesignerFilterComponent
' Provides a designer that can add a ColorCycleButtonDesigner to each
' button in a design time project using the ButtonDesignerFilterService
' ITypeDescriptorFilterService.
Public Class ButtonDesignerFilterComponentDesigner
Inherits System.ComponentModel.Design.ComponentDesigner
' Indicates whether the service has been loaded.
Private serviceloaded As Boolean = False
' Stores any old ITypeDescriptorFilterService to restore later.
Private oldservice As ITypeDescriptorFilterService = Nothing
Public Sub New()
End Sub
' Loads the new ITypeDescriptorFilterService and reloads the
' designers for each Button.
Public Overrides Sub Initialize(ByVal component As System.ComponentModel.IComponent)
MyBase.Initialize(component)
' Loads the custom service if it has not been loaded already.
LoadService()
' Build list of buttons from Container.Components.
Dim buttons As New ArrayList()
Dim c As IComponent
For Each c In Me.Component.Site.Container.Components
If TypeOf c Is System.Windows.Forms.Button Then
buttons.Add(CType(c, System.Windows.Forms.Button))
End If
Next c
If buttons.Count > 0 Then
' Tests each Button for an existing
' ColorCycleButtonDesigner;
' if it has no designer of type
' ColorCycleButtonDesigner, adds a designer.
Dim b As System.Windows.Forms.Button
For Each b In buttons
Dim loaddesigner As Boolean = True
' Gets the attributes for each button.
Dim ac As AttributeCollection = TypeDescriptor.GetAttributes(b)
Dim i As Integer
For i = 0 To ac.Count - 1
' If designer attribute is not for a
' ColorCycleButtonDesigner, adds a new
' ColorCycleButtonDesigner.
If TypeOf ac(i) Is DesignerAttribute Then
Dim da As DesignerAttribute = CType(ac(i), DesignerAttribute)
If da.DesignerTypeName.Substring((da.DesignerTypeName.LastIndexOf(".") + 1)) = "ColorCycleButtonDesigner" Then
loaddesigner = False
End If
End If
Next i
If loaddesigner Then
' Saves the button location so that it
' can be repositioned.
Dim p As Point = b.Location
' Gets an IMenuCommandService to cut and
' paste control in order to register with
' selection and movement interface after
' designer is changed without reloading.
Dim imcs As IMenuCommandService = CType(Me.GetService(GetType(IMenuCommandService)), IMenuCommandService)
If imcs Is Nothing Then
Throw New Exception("Could not obtain IMenuCommandService interface.")
End If
' Gets an ISelectionService to select the
' button so that it can be cut and pasted.
Dim iss As ISelectionService = CType(Me.GetService(GetType(ISelectionService)), ISelectionService)
If iss Is Nothing Then
Throw New Exception("Could not obtain ISelectionService interface.")
End If
iss.SetSelectedComponents(New IComponent() {b}, SelectionTypes.Auto)
' Invoke Cut and Paste.
imcs.GlobalInvoke(StandardCommands.Cut)
imcs.GlobalInvoke(StandardCommands.Paste)
' Regains reference to button from
' selection service.
Dim b2 As System.Windows.Forms.Button = CType(iss.PrimarySelection, System.Windows.Forms.Button)
iss.SetSelectedComponents(Nothing)
' Refreshes TypeDescriptor properties of
' button to load new attributes from
' ButtonDesignerFilterService.
TypeDescriptor.Refresh(b2)
b2.Location = p
b2.Focus()
End If
Next b
End If
End Sub
' Loads a ButtonDesignerFilterService ITypeDescriptorFilterService
' to add ColorCycleButtonDesigner designers to each button.
Private Sub LoadService()
' If no custom ITypeDescriptorFilterService is loaded,
' loads it now.
If Not serviceloaded Then
' Stores the current ITypeDescriptorFilterService
' to restore later.
Dim tdfs As ITypeDescriptorFilterService = CType(Me.Component.Site.GetService(GetType(ITypeDescriptorFilterService)), ITypeDescriptorFilterService)
If Not (tdfs Is Nothing) Then
oldservice = tdfs
End If
' Retrieves an IDesignerHost interface to use to
' remove and add services.
Dim dh As IDesignerHost = CType(Me.Component.Site.GetService(GetType(IDesignerHost)), IDesignerHost)
If dh Is Nothing Then
Throw New Exception("Could not obtain IDesignerHost interface.")
End If
' Removes the standard ITypeDescriptorFilterService.
dh.RemoveService(GetType(ITypeDescriptorFilterService))
' Adds the new custom ITypeDescriptorFilterService.
dh.AddService(GetType(ITypeDescriptorFilterService), New ButtonDesignerFilterService())
serviceloaded = True
End If
End Sub
' Removes the custom service and reloads any stored,
' preexisting service.
Private Sub RemoveService()
Dim dh As IDesignerHost = CType(Me.GetService(GetType(IDesignerHost)), IDesignerHost)
If dh Is Nothing Then
Throw New Exception("Could not obtain IDesignerHost interface.")
End If
dh.RemoveService(GetType(ITypeDescriptorFilterService))
If Not (oldservice Is Nothing) Then
dh.AddService(GetType(ITypeDescriptorFilterService), oldservice)
End If
serviceloaded = False
End Sub
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If serviceloaded Then
RemoveService()
End If
End Sub
End Class
' Provides a TypeDescriptorFilterService to add the
' ColorCycleButtonDesigner using a DesignerAttribute.
Public Class ButtonDesignerFilterService
Implements System.ComponentModel.Design.ITypeDescriptorFilterService
Public oldService As ITypeDescriptorFilterService = Nothing
Public Sub New()
End Sub
Public Sub New(ByVal oldService_ As ITypeDescriptorFilterService)
' Stores any previous ITypeDescriptorFilterService to implement service chaining.
Me.oldService = oldService_
End Sub
Public Function FilterAttributes(ByVal component As System.ComponentModel.IComponent, ByVal attributes As System.Collections.IDictionary) As Boolean Implements ITypeDescriptorFilterService.FilterAttributes
If Not (oldService Is Nothing) Then
oldService.FilterAttributes(component, attributes)
End If
' Creates a designer attribute to compare its TypeID with the TypeID of existing attributes of the component.
Dim da As New DesignerAttribute(GetType(ColorCycleButtonDesigner))
' Adds the designer attribute if the attribute collection does not contain a DesignerAttribute of the same TypeID.
If TypeOf component Is System.Windows.Forms.Button And attributes.Contains(da.TypeId) Then
attributes(da.TypeId) = da
End If
Return True
End Function
Public Function FilterEvents(ByVal component As System.ComponentModel.IComponent, ByVal events As System.Collections.IDictionary) As Boolean Implements ITypeDescriptorFilterService.FilterEvents
If Not (oldService Is Nothing) Then
oldService.FilterEvents(component, events)
End If
Return True
End Function
Public Function FilterProperties(ByVal component As System.ComponentModel.IComponent, ByVal properties As System.Collections.IDictionary) As Boolean Implements ITypeDescriptorFilterService.FilterProperties
If Not (oldService Is Nothing) Then
oldService.FilterProperties(component, properties)
End If
Return True
End Function
End Class
' Designer for a Button control which cycles the background color.
Public Class ColorCycleButtonDesigner
Inherits System.Windows.Forms.Design.ControlDesigner
Private timer1 As System.Windows.Forms.Timer
Private initial_bcolor, initial_fcolor As Color
Private r, g, b As Integer
Private ru, gu, bu, continue_ As Boolean
Public Sub New()
timer1 = New System.Windows.Forms.Timer()
timer1.Interval = 50
AddHandler timer1.Tick, AddressOf Me.Elapsed
ru = True
gu = False
bu = True
continue_ = False
timer1.Start()
End Sub
Private Sub Elapsed(ByVal sender As Object, ByVal e As EventArgs)
Me.Control.BackColor = Color.FromArgb(r Mod 255, g Mod 255, b Mod 255)
Me.Control.Refresh()
' Updates color.
If ru Then
r += 10
Else
If r > 10 Then
r -= 10
End If
End If
If gu Then
g += 10
Else
If g > 10 Then
g -= 10
End If
End If
If bu Then
b += 10
Else
If b > 10 Then
b -= 10
End If
End If
' Randomly switches direction of color component values.
Dim rand As New Random()
Dim i As Integer
For i = 0 To 3
Select Case rand.Next(0, 2)
Case 0
If ru Then
ru = False
Else
ru = True
End If
Case 1
If gu Then
gu = False
Else
gu = True
End If
Case 2
If bu Then
bu = False
Else
bu = True
End If
End Select
Next i
Me.Control.ForeColor = Color.FromArgb((Me.Control.BackColor.R + 128) Mod 255, (Me.Control.BackColor.G + 128) Mod 255, (Me.Control.BackColor.B + 128) Mod 255)
End Sub
Protected Overrides Sub OnMouseEnter()
If Not timer1.Enabled Then
initial_bcolor = Me.Control.BackColor
initial_fcolor = Me.Control.ForeColor
r = initial_bcolor.R
g = initial_bcolor.G
b = initial_bcolor.B
timer1.Start()
End If
End Sub
Protected Overrides Sub OnMouseLeave()
If Not continue_ Then
continue_ = True
timer1.Stop()
Else
continue_ = False
End If
Me.Control.BackColor = initial_bcolor
Me.Control.ForeColor = initial_fcolor
End Sub
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
timer1.Stop()
Me.Control.BackColor = initial_bcolor
Me.Control.ForeColor = initial_fcolor
MyBase.Dispose(disposing)
End Sub
End Class
' System.Windows.Forms.Button associated with the ColorCycleButtonDesigner.
<Designer(GetType(ColorCycleButtonDesigner))> _
Public Class ColorCycleButton
Inherits System.Windows.Forms.Button
Public Sub New()
End Sub
End Class
End Namespace
using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.ComponentModel.Design.Serialization;
using System.Drawing;
using System.Reflection;
using System.Timers;
using System.Windows.Forms;
using System.Windows.Forms.Design;
namespace ITypeDescriptorFilterSample
{
// Component to host the ButtonDesignerFilterComponentDesigner that loads the
// ButtonDesignerFilterService ITypeDescriptorFilterService.
[Designer(typeof(ButtonDesignerFilterComponentDesigner))]
public class ButtonDesignerFilterComponent : System.ComponentModel.Component
{
public ButtonDesignerFilterComponent(System.ComponentModel.IContainer container)
{
container.Add(this);
}
public ButtonDesignerFilterComponent()
{}
}
// Provides a designer that can add a ColorCycleButtonDesigner to each
// button in a design time project using the ButtonDesignerFilterService
// ITypeDescriptorFilterService.
public class ButtonDesignerFilterComponentDesigner : System.ComponentModel.Design.ComponentDesigner
{
// Indicates whether the service has been loaded.
private bool serviceloaded = false;
// Stores any old ITypeDescriptorFilterService to restore later.
private ITypeDescriptorFilterService oldservice = null;
public ButtonDesignerFilterComponentDesigner()
{}
// Loads the new ITypeDescriptorFilterService and reloads the
// designers for each button.
public override void Initialize(System.ComponentModel.IComponent component)
{
base.Initialize(component);
// Loads the custom service if it has not been loaded already
LoadService();
// Build list of buttons from Container.Components.
ArrayList buttons = new ArrayList();
foreach(IComponent c in this.Component.Site.Container.Components)
if(c.GetType() == typeof(System.Windows.Forms.Button))
buttons.Add((System.Windows.Forms.Button)c);
if(buttons.Count > 0)
{
// Tests each Button for an existing
// ColorCycleButtonDesigner;
// if it has no designer of type
// ColorCycleButtonDesigner, adds a designer.
foreach(System.Windows.Forms.Button b in buttons)
{
bool loaddesigner = true;
// Gets the attributes for each button.
AttributeCollection ac = TypeDescriptor.GetAttributes(b);
for(int i=0; i<ac.Count; i++)
{
// If designer attribute is not for a
// ColorCycleButtonDesigner, adds a new
// ColorCycleButtonDesigner.
if( ac[i] is DesignerAttribute )
{
DesignerAttribute da = (DesignerAttribute)ac[i];
if( da.DesignerTypeName.Substring(da.DesignerTypeName.LastIndexOf(".")+1) == "ColorCycleButtonDesigner" )
loaddesigner = false;
}
}
if(loaddesigner)
{
// Saves the button location so that it
// can be repositioned.
Point p = b.Location;
// Gets an IMenuCommandService to cut and
// paste control in order to register with
// selection and movement interface after
// designer is changed without reloading.
IMenuCommandService imcs = (IMenuCommandService)this.GetService(typeof(IMenuCommandService));
if( imcs == null )
throw new Exception("Could not obtain IMenuCommandService interface.");
// Gets an ISelectionService to select the
// button so that it can be cut and pasted.
ISelectionService iss = (ISelectionService)this.GetService(typeof(ISelectionService));
if( iss == null)
throw new Exception("Could not obtain ISelectionService interface.");
iss.SetSelectedComponents(new IComponent[] { b }, SelectionTypes.Auto);
// Invoke Cut and Paste.
imcs.GlobalInvoke(StandardCommands.Cut);
imcs.GlobalInvoke(StandardCommands.Paste);
// Regains reference to button from
// selection service.
System.Windows.Forms.Button b2 = (System.Windows.Forms.Button)iss.PrimarySelection;
iss.SetSelectedComponents(null);
// Refreshes TypeDescriptor properties of
// button to load new attributes from
// ButtonDesignerFilterService.
TypeDescriptor.Refresh(b2);
b2.Location = p;
b2.Focus();
}
}
}
}
// Loads a ButtonDesignerFilterService ITypeDescriptorFilterService
// to add ColorCycleButtonDesigner designers to each button.
private void LoadService()
{
// If no custom ITypeDescriptorFilterService is loaded,
// loads it now.
if(!serviceloaded)
{
// Stores the current ITypeDescriptorFilterService
// to restore later.
ITypeDescriptorFilterService tdfs = (ITypeDescriptorFilterService)this.Component.Site.GetService(typeof(ITypeDescriptorFilterService));
if( tdfs != null )
oldservice = tdfs;
// Retrieves an IDesignerHost interface to use to
// remove and add services.
IDesignerHost dh = (IDesignerHost)this.Component.Site.GetService(typeof(IDesignerHost));
if( dh == null )
throw new Exception("Could not obtain IDesignerHost interface.");
// Removes standard ITypeDescriptorFilterService.
dh.RemoveService(typeof(ITypeDescriptorFilterService));
// Adds new custom ITypeDescriptorFilterService.
dh.AddService(typeof(ITypeDescriptorFilterService), new ButtonDesignerFilterService());
serviceloaded = true;
}
}
// Removes the custom service and reloads any stored,
// preexisting service.
private void RemoveService()
{
IDesignerHost dh = (IDesignerHost)this.GetService(typeof(IDesignerHost));
if( dh == null )
throw new Exception("Could not obtain IDesignerHost interface.");
dh.RemoveService(typeof(ITypeDescriptorFilterService));
if( oldservice != null )
dh.AddService(typeof(ITypeDescriptorFilterService), oldservice);
serviceloaded = false;
}
protected override void Dispose(bool disposing)
{
if(serviceloaded)
RemoveService();
}
}
// Provides a TypeDescriptorFilterService to add the
// ColorCycleButtonDesigner using a DesignerAttribute.
public class ButtonDesignerFilterService : System.ComponentModel.Design.ITypeDescriptorFilterService
{
public ITypeDescriptorFilterService oldService = null;
public ButtonDesignerFilterService()
{}
public ButtonDesignerFilterService(ITypeDescriptorFilterService oldService_)
{
// Stores any previous ITypeDescriptorFilterService to implement service chaining.
this.oldService = oldService_;
}
public bool FilterAttributes(System.ComponentModel.IComponent component, System.Collections.IDictionary attributes)
{
if(oldService != null)
oldService.FilterAttributes(component, attributes);
// Creates a designer attribute to compare its TypeID with the TypeID of existing attributes of the component.
DesignerAttribute da = new DesignerAttribute(typeof(ColorCycleButtonDesigner));
// Adds the designer attribute if the attribute collection does not contain a DesignerAttribute of the same TypeID.
if(component is System.Windows.Forms.Button && attributes.Contains(da.TypeId))
attributes[da.TypeId]=da;
return true;
}
public bool FilterEvents(System.ComponentModel.IComponent component, System.Collections.IDictionary events)
{
if(oldService != null)
oldService.FilterEvents(component, events);
return true;
}
public bool FilterProperties(System.ComponentModel.IComponent component, System.Collections.IDictionary properties)
{
if(oldService != null)
oldService.FilterProperties(component, properties);
return true;
}
}
// Designer for a Button control which cycles the background color.
public class ColorCycleButtonDesigner : System.Windows.Forms.Design.ControlDesigner
{
private System.Windows.Forms.Timer timer1;
private Color initial_bcolor, initial_fcolor;
private int r, g, b;
private bool ru, gu, bu, continue_;
public ColorCycleButtonDesigner()
{
timer1 = new System.Windows.Forms.Timer();
timer1.Interval = 50;
timer1.Tick += new EventHandler(this.Elapsed);
ru = true;
gu = false;
bu = true;
continue_ = false;
timer1.Start();
}
private void Elapsed(object sender, EventArgs e)
{
this.Control.BackColor = Color.FromArgb(r%255, g%255, b%255);
this.Control.Refresh();
// Updates color.
if(ru)
r+=10;
else if(r>10)
r-=10;
if(gu)
g+=10;
else if(g>10)
g-=10;
if(bu)
b+=10;
else if(b>10)
b-=10;
// Randomly switches direction of color component values.
Random rand = new Random();
for(int i=0; i<4; i++)
switch(rand.Next(0, 2))
{
case 0:
if(ru)
ru=false;
else
ru=true;
break;
case 1:
if(gu)
gu=false;
else
gu=true;
break;
case 2:
if(bu)
bu=false;
else
bu=true;
break;
}
this.Control.ForeColor = Color.FromArgb((this.Control.BackColor.R+128)%255, (this.Control.BackColor.G+128)%255, (this.Control.BackColor.B+128)%255);
}
protected override void OnMouseEnter()
{
if(!timer1.Enabled)
{
initial_bcolor = this.Control.BackColor;
initial_fcolor = this.Control.ForeColor;
r = initial_bcolor.R;
g = initial_bcolor.G;
b = initial_bcolor.B;
timer1.Start();
}
}
protected override void OnMouseLeave()
{
if(!continue_)
{
continue_ = true;
timer1.Stop();
}
else
continue_ = false;
this.Control.BackColor = initial_bcolor;
this.Control.ForeColor = initial_fcolor;
}
protected override void Dispose(bool disposing)
{
timer1.Stop();
this.Control.BackColor = initial_bcolor;
this.Control.ForeColor = initial_fcolor;
base.Dispose(disposing);
}
}
// System.Windows.Forms.Button associated with the ColorCycleButtonDesigner.
[Designer(typeof(ColorCycleButtonDesigner))]
public class ColorCycleButton : System.Windows.Forms.Button
{
public ColorCycleButton()
{}
}
}
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
#using <System.Design.dll>
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::ComponentModel::Design::Serialization;
using namespace System::Drawing;
using namespace System::Reflection;
using namespace System::Timers;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::Design;
// Designer for a Button control which cycles the background color.
public ref class ColorCycleButtonDesigner: public System::Windows::Forms::Design::ControlDesigner
{
private:
System::Windows::Forms::Timer^ timer1;
Color initial_bcolor;
Color initial_fcolor;
int r;
int g;
int b;
bool ru;
bool gu;
bool bu;
bool continue_;
public:
ColorCycleButtonDesigner()
{
timer1 = gcnew System::Windows::Forms::Timer;
timer1->Interval = 50;
timer1->Tick += gcnew EventHandler( this, &ColorCycleButtonDesigner::Elapsed );
ru = true;
gu = false;
bu = true;
continue_ = false;
timer1->Start();
}
private:
void Elapsed( Object^ /*sender*/, EventArgs^ /*e*/ )
{
this->Control->BackColor = Color::FromArgb( r % 255, g % 255, b % 255 );
this->Control->Refresh();
// Updates color.
if ( ru )
r += 10;
else
if ( r > 10 )
r -= 10;
if ( gu )
g += 10;
else
if ( g > 10 )
g -= 10;
if ( bu )
b += 10;
else
if ( b > 10 )
b -= 10;
// Randomly switches direction of color component values.
Random^ rand = gcnew Random;
for ( int i = 0; i < 4; i++ )
switch ( rand->Next( 0, 2 ) )
{
case 0:
if ( ru )
ru = false;
else
ru = true;
break;
case 1:
if ( gu )
gu = false;
else
gu = true;
break;
case 2:
if ( bu )
bu = false;
else
bu = true;
break;
}
this->Control->ForeColor = Color::FromArgb( (this->Control->BackColor.R + 128) % 255, (this->Control->BackColor.G + 128) % 255, (this->Control->BackColor.B + 128) % 255 );
}
protected:
virtual void OnMouseEnter() override
{
if ( !timer1->Enabled )
{
initial_bcolor = this->Control->BackColor;
initial_fcolor = this->Control->ForeColor;
r = initial_bcolor.R;
g = initial_bcolor.G;
b = initial_bcolor.B;
timer1->Start();
}
}
virtual void OnMouseLeave() override
{
if ( !continue_ )
{
continue_ = true;
timer1->Stop();
}
else
continue_ = false;
this->Control->BackColor = initial_bcolor;
this->Control->ForeColor = initial_fcolor;
}
public:
~ColorCycleButtonDesigner()
{
timer1->Stop();
this->Control->BackColor = initial_bcolor;
this->Control->ForeColor = initial_fcolor;
}
};
// Provides a TypeDescriptorFilterService to add the
// ColorCycleButtonDesigner using a DesignerAttribute.
public ref class ButtonDesignerFilterService: public System::ComponentModel::Design::ITypeDescriptorFilterService
{
public:
ITypeDescriptorFilterService^ oldService;
ButtonDesignerFilterService(){}
ButtonDesignerFilterService( ITypeDescriptorFilterService^ oldService_ )
{
// Stores any previous ITypeDescriptorFilterService to implement service chaining.
this->oldService = oldService_;
}
virtual bool FilterAttributes( System::ComponentModel::IComponent^ component, System::Collections::IDictionary^ attributes )
{
if ( oldService != nullptr )
oldService->FilterAttributes( component, attributes );
// Creates a designer attribute to compare its TypeID with the TypeID of existing attributes of the component.
DesignerAttribute^ da = gcnew DesignerAttribute( ColorCycleButtonDesigner::typeid );
// Adds the designer attribute if the attribute collection does not contain a DesignerAttribute of the same TypeID.
if ( dynamic_cast<System::Windows::Forms::Button^>(component) && attributes->Contains( da->TypeId ) )
attributes[ da->TypeId ] = da;
return true;
}
virtual bool FilterEvents( System::ComponentModel::IComponent^ component, System::Collections::IDictionary^ events )
{
if ( oldService != nullptr )
oldService->FilterEvents( component, events );
return true;
}
virtual bool FilterProperties( System::ComponentModel::IComponent^ component, System::Collections::IDictionary^ properties )
{
if ( oldService != nullptr )
oldService->FilterProperties( component, properties );
return true;
}
};
// System.Windows.Forms.Button associated with the ColorCycleButtonDesigner.
[Designer(ColorCycleButtonDesigner::typeid)]
public ref class ColorCycleButton: public System::Windows::Forms::Button
{
public:
ColorCycleButton(){}
};
// Provides a designer that can add a ColorCycleButtonDesigner to each
// button in a design time project using the ButtonDesignerFilterService
// ITypeDescriptorFilterService.
public ref class ButtonDesignerFilterComponentDesigner: public System::ComponentModel::Design::ComponentDesigner
{
private:
// Indicates whether the service has been loaded.
bool serviceloaded;
// Stores any old ITypeDescriptorFilterService to restore later.
ITypeDescriptorFilterService^ oldservice;
public:
ButtonDesignerFilterComponentDesigner()
{
serviceloaded = false;
}
// Loads the new ITypeDescriptorFilterService and reloads the
// designers for each button.
virtual void Initialize( System::ComponentModel::IComponent^ component ) override
{
ComponentDesigner::Initialize( component );
// Loads the custom service if it has not been loaded already
LoadService();
// Build list of buttons from Container.Components.
ArrayList^ buttons = gcnew ArrayList;
IEnumerator^ myEnum = this->Component->Site->Container->Components->GetEnumerator();
while ( myEnum->MoveNext() )
{
IComponent^ c = safe_cast<IComponent^>(myEnum->Current);
if ( c->GetType() == System::Windows::Forms::Button::typeid )
buttons->Add( dynamic_cast<System::Windows::Forms::Button^>(c) );
}
if ( buttons->Count > 0 )
{
// Tests each Button for an existing
// ColorCycleButtonDesigner;
// if it has no designer of type
// ColorCycleButtonDesigner, adds a designer.
IEnumerator^ myEnum1 = buttons->GetEnumerator();
while ( myEnum1->MoveNext() )
{
Button^ b = safe_cast<Button^>(myEnum1->Current);
bool loaddesigner = true;
// Gets the attributes for each button.
AttributeCollection^ ac = TypeDescriptor::GetAttributes( b );
for ( int i = 0; i < ac->Count; i++ )
{
// If designer attribute is not for a
// ColorCycleButtonDesigner, adds a new
// ColorCycleButtonDesigner.
if ( dynamic_cast<DesignerAttribute^>(ac[ i ]) )
{
DesignerAttribute^ da = dynamic_cast<DesignerAttribute^>(ac[ i ]);
if ( da->DesignerTypeName->Substring( da->DesignerTypeName->LastIndexOf( "." ) + 1 )->Equals( "ColorCycleButtonDesigner" ) )
loaddesigner = false;
}
}
if ( loaddesigner )
{
// Saves the button location so that it
// can be repositioned.
Point p = b->Location;
// Gets an IMenuCommandService to cut and
// paste control in order to register with
// selection and movement interface after
// designer is changed without reloading.
IMenuCommandService^ imcs = dynamic_cast<IMenuCommandService^>(this->GetService( IMenuCommandService::typeid ));
if ( imcs == nullptr )
throw gcnew Exception( "Could not obtain IMenuCommandService interface." );
// Gets an ISelectionService to select the
// button so that it can be cut and pasted.
ISelectionService^ iss = dynamic_cast<ISelectionService^>(this->GetService( ISelectionService::typeid ));
if ( iss == nullptr )
throw gcnew Exception( "Could not obtain ISelectionService interface." );
array<IComponent^>^temp0 = {b};
iss->SetSelectedComponents( dynamic_cast<ICollection^>(temp0), SelectionTypes::Normal );
// Invoke Cut and Paste.
imcs->GlobalInvoke( StandardCommands::Cut );
imcs->GlobalInvoke( StandardCommands::Paste );
// Regains reference to button from
// selection service.
System::Windows::Forms::Button^ b2 = dynamic_cast<System::Windows::Forms::Button^>(iss->PrimarySelection);
iss->SetSelectedComponents( nullptr );
// Refreshes TypeDescriptor properties of
// button to load new attributes from
// ButtonDesignerFilterService.
TypeDescriptor::Refresh( b2 );
b2->Location = p;
b2->Focus();
}
}
}
}
private:
// Loads a ButtonDesignerFilterService ITypeDescriptorFilterService
// to add ColorCycleButtonDesigner designers to each button.
void LoadService()
{
// If no custom ITypeDescriptorFilterService is loaded,
// loads it now.
if ( !serviceloaded )
{
// Stores the current ITypeDescriptorFilterService
// to restore later.
ITypeDescriptorFilterService^ tdfs = dynamic_cast<ITypeDescriptorFilterService^>(this->Component->Site->GetService( ITypeDescriptorFilterService::typeid ));
if ( tdfs != nullptr )
oldservice = tdfs;
// Retrieves an IDesignerHost interface to use to
// remove and add services.
IDesignerHost^ dh = dynamic_cast<IDesignerHost^>(this->Component->Site->GetService( IDesignerHost::typeid ));
if ( dh == nullptr )
throw gcnew Exception( "Could not obtain IDesignerHost interface." );
// Removes standard ITypeDescriptorFilterService.
dh->RemoveService( ITypeDescriptorFilterService::typeid );
// Adds new custom ITypeDescriptorFilterService.
dh->AddService( ITypeDescriptorFilterService::typeid, gcnew ButtonDesignerFilterService );
serviceloaded = true;
}
}
// Removes the custom service and reloads any stored,
// preexisting service.
void RemoveService()
{
IDesignerHost^ dh = dynamic_cast<IDesignerHost^>(this->GetService( IDesignerHost::typeid ));
if ( dh == nullptr )
throw gcnew Exception( "Could not obtain IDesignerHost interface." );
dh->RemoveService( ITypeDescriptorFilterService::typeid );
if ( oldservice != nullptr )
dh->AddService( ITypeDescriptorFilterService::typeid, oldservice );
serviceloaded = false;
}
public:
~ButtonDesignerFilterComponentDesigner()
{
if ( serviceloaded )
RemoveService();
}
};
// Component to host the ButtonDesignerFilterComponentDesigner that loads the
// ButtonDesignerFilterService ITypeDescriptorFilterService.
[Designer(ButtonDesignerFilterComponentDesigner::typeid)]
public ref class ButtonDesignerFilterComponent: public System::ComponentModel::Component
{
public:
ButtonDesignerFilterComponent( System::ComponentModel::IContainer^ container )
{
container->Add( this );
}
ButtonDesignerFilterComponent(){}
};
package ITypeDescriptorFilterSample;
import System.*;
import System.Collections.*;
import System.ComponentModel.*;
import System.ComponentModel.Design.*;
import System.ComponentModel.Design.Serialization.*;
import System.Drawing.*;
import System.Reflection.*;
import System.Timers.*;
import System.Windows.Forms.*;
import System.Windows.Forms.Design.*;
// Component to host the ButtonDesignerFilterComponentDesigner that loads the
// ButtonDesignerFilterService ITypeDescriptorFilterService.
/** @attribute Designer(ButtonDesignerFilterComponentDesigner.class)
*/
public class ButtonDesignerFilterComponent
extends System.ComponentModel.Component
{
public ButtonDesignerFilterComponent(System.ComponentModel.
IContainer container)
{
container.Add(this);
} //ButtonDesignerFilterComponent
public ButtonDesignerFilterComponent()
{
} //ButtonDesignerFilterComponent
} //ButtonDesignerFilterComponent
// Provides a designer that can add a ColorCycleButtonDesigner to each
// button in a design time project using the ButtonDesignerFilterService
// ITypeDescriptorFilterService.
public class ButtonDesignerFilterComponentDesigner
extends System.ComponentModel.Design.ComponentDesigner
{
// Indicates whether the service has been loaded.
private boolean serviceLoaded = false;
// Stores any old ITypeDescriptorFilterService to restore later.
private ITypeDescriptorFilterService oldService = null;
public ButtonDesignerFilterComponentDesigner()
{
} //ButtonDesignerFilterComponentDesigner
// Loads the new ITypeDescriptorFilterService and reloads the
// designers for each button.
public void Initialize(System.ComponentModel.IComponent component)
throws Exception
{
super.Initialize(component);
// Loads the custom service if it has not been loaded already
LoadService();
// Build list of buttons from Container.Components.
ArrayList buttons = new ArrayList();
for(int iCtr = 0; iCtr < this.get_Component().get_Site().
get_Container().get_Components().get_Count(); iCtr++) {
IComponent c = this.get_Component().get_Site().get_Container().
get_Components().get_Item(iCtr);
if(c.GetType().Equals(System.Windows.Forms.
Button.class.ToType())) {
buttons.Add((System.Windows.Forms.Button)c);
}
}
if (buttons.get_Count() > 0) {
// Tests each Button for an existing
// ColorCycleButtonDesigner;
// if it has no designer of type
// ColorCycleButtonDesigner, adds a designer.
for (int iCtr=0; iCtr<buttons.get_Count(); iCtr++ ){
System.Windows.Forms.Button b =(System.Windows.
Forms.Button) buttons.get_Item(iCtr);
boolean loadDesigner = true;
// Gets the attributes for each button.
AttributeCollection ac = TypeDescriptor.GetAttributes(b);
for (int i = 0; i < ac.get_Count(); i++) {
// If designer attribute is not for a
// ColorCycleButtonDesigner, adds a new
// ColorCycleButtonDesigner.
if (ac.get_Item(i) instanceof DesignerAttribute) {
DesignerAttribute da = (DesignerAttribute)ac.
get_Item(i);
if (da.get_DesignerTypeName().Substring((da.
get_DesignerTypeName().LastIndexOf(".")+ 1)).
Equals("ColorCycleButtonDesigner")) {
loadDesigner = false;
}
}
}
if (loadDesigner) {
// Saves the button location so that it
// can be repositioned.
Point p = b.get_Location();
// Gets an IMenuCommandService to cut and
// paste control in order to register with
// selection and movement interface after
// designer is changed without reloading.
IMenuCommandService imcs = (IMenuCommandService)(this.
GetService(IMenuCommandService.class.ToType()));
if (imcs == null) {
throw new Exception("Could not obtain"
+ "ISelectionService interface.");
}
// Gets an ISelectionService to select the
// button so that it can be cut and pasted.
ISelectionService iss = (ISelectionService)this.
GetService(ISelectionService.class.ToType());
if (iss == null) {
throw new Exception("Could not obtain"
+ "ISelectionService interface.");
}
iss.SetSelectedComponents(new IComponent[] {b},
SelectionTypes.Normal);
// Invoke Cut and Paste.
imcs.GlobalInvoke(StandardCommands.Cut);
imcs.GlobalInvoke(StandardCommands.Paste);
// Regains reference to button from
// selection service.
System.Windows.Forms.Button b2 = (System.Windows.
Forms.Button)iss.get_PrimarySelection();
iss.SetSelectedComponents(null);
// Refreshes TypeDescriptor properties of
// button to load new attributes from
// ButtonDesignerFilterService.
TypeDescriptor.Refresh(b2);
b2.set_Location(p);
b2.Focus();
}
}
}
} //Initialize
// Loads a ButtonDesignerFilterService ITypeDescriptorFilterService
// to add ColorCycleButtonDesigner designers to each button.
private void LoadService() throws Exception
{
// If no custom ITypeDescriptorFilterService is loaded,
// loads it now.
if (!(serviceLoaded)) {
// Stores the current ITypeDescriptorFilterService
// to restore later.
ITypeDescriptorFilterService tdfs =
(ITypeDescriptorFilterService)(this.get_Component().get_Site().
GetService(ITypeDescriptorFilterService.class.ToType()));
if (tdfs != null) {
oldService = tdfs;
}
// Retrieves an IDesignerHost interface to use to
// remove and add services.
IDesignerHost dh = (IDesignerHost) this.get_Component().
get_Site().GetService(IDesignerHost.class.ToType());
if (dh == null) {
throw new Exception("Could not obtain IDesignerHost interface.");
}
// Removes standard ITypeDescriptorFilterService.
dh.RemoveService(ITypeDescriptorFilterService.class.ToType());
// Adds new custom ITypeDescriptorFilterService.
dh.AddService(ITypeDescriptorFilterService.class.ToType(),
new ButtonDesignerFilterService());
serviceLoaded = true;
}
} //LoadService
// Removes the custom service and reloads any stored,
// preexisting service.
private void RemoveService() throws Exception
{
IDesignerHost dh
= (IDesignerHost)(this.GetService(IDesignerHost.class.ToType()));
if (dh == null) {
throw new Exception("Could not obtain IDesignerHost interface.");
}
dh.RemoveService(ITypeDescriptorFilterService.class.ToType());
if (oldService != null) {
dh.AddService(ITypeDescriptorFilterService.
class.ToType(),oldService);
}
serviceLoaded = false;
} //RemoveService
protected void Dispose(boolean disposing) throws Exception
{
if (serviceLoaded) {
RemoveService();
}
} //Dispose
} //ButtonDesignerFilterComponentDesigner
// Provides a TypeDescriptorFilterService to add the
// ColorCycleButtonDesigner using a DesignerAttribute.
public class ButtonDesignerFilterService
implements System.ComponentModel.Design.ITypeDescriptorFilterService
{
public ITypeDescriptorFilterService oldService = null;
public ButtonDesignerFilterService()
{
} //ButtonDesignerFilterService
public ButtonDesignerFilterService(
ITypeDescriptorFilterService oldService_)
{
// Stores any previous ITypeDescriptorFilterService to implement
//service chaining.
this.oldService = oldService_;
} //ButtonDesignerFilterService
public boolean FilterAttributes(System.ComponentModel.IComponent component,
System.Collections.IDictionary attributes)
{
if (oldService != null ) {
oldService.FilterAttributes(component, attributes);
}
// Creates a designer attribute to compare its TypeID with the TypeID
//of existing attributes of the component.
DesignerAttribute da = new DesignerAttribute(ColorCycleButtonDesigner
.class.ToType());
// Adds the designer attribute if the attribute collection does not
//contain a DesignerAttribute of the same TypeID.
if (component instanceof System.Windows.Forms.Button
&& attributes.Contains(da.get_TypeId())) {
attributes.set_Item( da.get_TypeId(), da );
}
return true ;
} //FilterAttributes
public boolean FilterEvents(System.ComponentModel.IComponent component,
System.Collections.IDictionary events)
{
if (oldService != null) {
oldService.FilterEvents(component, events);
}
return true ;
} //FilterEvents
public boolean FilterProperties(System.ComponentModel.IComponent component,
System.Collections.IDictionary properties)
{
if (oldService != null) {
oldService.FilterProperties(component, properties);
}
return true ;
} //FilterProperties
} //ButtonDesignerFilterService
// Designer for a Button control which cycles the background color.
public class ColorCycleButtonDesigner
extends System.Windows.Forms.Design.ControlDesigner
{
private System.Windows.Forms.Timer timer1;
private Color initial_bcolor, initial_fcolor;
private int r, g, b;
private boolean ru, gu, bu, continue_;
public ColorCycleButtonDesigner()
{
timer1 = new System.Windows.Forms.Timer();
timer1.set_Interval(50);
timer1.add_Tick(new EventHandler(this.Elapsed));
ru = true;
gu = false;
bu = true;
continue_ = false;
timer1.Start();
} //ColorCycleButtonDesigner
private void Elapsed(Object sender, EventArgs e)
{
this.get_Control().set_BackColor(Color.FromArgb(r % 255,
g % 255, b % 255));
this.get_Control().Refresh();
// Updates color.
if (ru) {
r += 10;
}
else {
if (r > 10) {
r -= 10;
}
}
if( gu) {
g += 10;
}
else {
if (g > 10) {
g -= 10;
}
}
if (bu) {
b += 10;
}
else {
if ( b > 10 ) {
b -= 10;
}
}
// Randomly switches direction of color component values.
Random rand = new Random();
for (int i=0; i < 4; i++) {
switch (rand.Next(0, 2)) {
case 0 :
if (ru) {
ru = false;
}
else {
ru = true;
}
break;
case 1 :
if (gu) {
gu = false;
}
else {
gu = true;
}
break;
case 2 :
if (bu) {
bu = false;
}
else {
bu = true;
}
break;
}
}
this.get_Control().set_ForeColor(Color.FromArgb((this.get_Control().
get_BackColor().get_R() + 128) % 255,(this.get_Control().
get_BackColor().get_G() + 128) % 255,(this.get_Control().
get_BackColor().get_B() + 128) % 255));
} //Elapsed
protected void OnMouseEnter()
{
if (!(timer1.get_Enabled())) {
initial_bcolor = this.get_Control().get_BackColor();
initial_fcolor = this.get_Control().get_ForeColor();
r = initial_bcolor.get_R();
g = initial_bcolor.get_G();
b = initial_bcolor.get_B();
timer1.Start();
}
} //OnMouseEnter
protected void OnMouseLeave()
{
if (!(continue_)) {
continue_ = true;
timer1.Stop();
}
else {
continue_ = false;
}
this.get_Control().set_BackColor(initial_bcolor);
this.get_Control().set_ForeColor(initial_fcolor);
} //OnMouseLeave
protected void Dispose(boolean disposing)
{
timer1.Stop();
this.get_Control().set_BackColor(initial_bcolor);
this.get_Control().set_ForeColor(initial_fcolor);
super.Dispose(disposing);
} //Dispose
} //ColorCycleButtonDesigner
// System.Windows.Forms.Button associated with the ColorCycleButtonDesigner.
/** @attribute Designer(ColorCycleButtonDesigner.class)
*/
public class ColorCycleButton extends System.Windows.Forms.Button
{
public ColorCycleButton()
{
} //ColorCycleButton
} //ColorCycleButton
平台
Windows 98、Windows 2000 SP4、Windows Millennium Edition、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
请参见
参考
ITypeDescriptorFilterService 成员
System.ComponentModel.Design 命名空间
TypeDescriptor 类
EventDescriptor 类
PropertyDescriptor 类
Attribute
IDictionary