Control.PerformLayout Metoda
Definice
Důležité
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Vynutí, aby ovládací prvek použil logiku rozložení na podřízené ovládací prvky.
Přetížení
PerformLayout(Control, String) |
Vynutí, aby ovládací prvek použil logiku rozložení na všechny jeho podřízené ovládací prvky. |
PerformLayout() |
Vynutí, aby ovládací prvek použil logiku rozložení na všechny jeho podřízené ovládací prvky. |
PerformLayout(Control, String)
Vynutí, aby ovládací prvek použil logiku rozložení na všechny jeho podřízené ovládací prvky.
public:
void PerformLayout(System::Windows::Forms::Control ^ affectedControl, System::String ^ affectedProperty);
public void PerformLayout (System.Windows.Forms.Control affectedControl, string affectedProperty);
public void PerformLayout (System.Windows.Forms.Control? affectedControl, string? affectedProperty);
member this.PerformLayout : System.Windows.Forms.Control * string -> unit
Public Sub PerformLayout (affectedControl As Control, affectedProperty As String)
Parametry
- affectedProperty
- String
Název naposledy změněné vlastnosti ovládacího prvku.
Příklady
Následující příklad kódu ukazuje, jak použít metodu PerformLayout . Ukazuje také způsoby, jak je Layout událost vyvolána. V tomto příkladu obslužná rutina Click
události explicitně Button1
volá PerformLayout. Obslužná rutina Click
události implicitně Button2
volá PerformLayout.
PerformLayout je také volána při načtení formuláře.
Button3
vrátí ovládací prvek do stavu, ve který byl při načtení. V každém případě Layout se vyvolá událost.
Toto je úplný příklad. Pokud chcete spustit příklad, vložte následující kód do prázdného formuláře.
using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;
// This custom control has the Layout event implented so that when
// PerformLayout(AffectedControl, AffectedProperty) is called
// on the control, where AffectedProperty equals "Bounds" the
// textbox is centered on the control.
public ref class LayoutControl: public System::Windows::Forms::UserControl
{
public private:
System::Windows::Forms::TextBox^ TextBox1;
public:
LayoutControl()
: UserControl()
{
InitializeComponent();
}
private:
void InitializeComponent()
{
this->TextBox1 = gcnew System::Windows::Forms::TextBox;
this->SuspendLayout();
this->TextBox1->BorderStyle = System::Windows::Forms::BorderStyle::FixedSingle;
this->TextBox1->Name = "TextBox1";
this->TextBox1->TabIndex = 0;
this->BackColor = System::Drawing::SystemColors::ControlDark;
this->Controls->Add( this->TextBox1 );
this->Name = "LayoutControl";
this->ResumeLayout( false );
this->Layout += gcnew LayoutEventHandler( this, &LayoutControl::LayoutControl_Layout );
}
// This method is called when the Layout event is fired.
// This happens by during the initial load, by calling PerformLayout
// or by resizing, adding or removing controls or other actions that
// affect how the control is laid out. This method checks the
// value of e.AffectedProperty and changes the look of the
// control accordingly.
void LayoutControl_Layout( Object^ /*sender*/, System::Windows::Forms::LayoutEventArgs^ e )
{
if ( e->AffectedProperty != nullptr )
{
if ( e->AffectedProperty->Equals( "Bounds" ) )
{
TextBox1->Left = (this->Width - TextBox1->Width) / 2;
TextBox1->Top = (this->Height - TextBox1->Height) / 2;
}
}
else
{
this->Size = System::Drawing::Size( 150, 160 );
TextBox1->Location = System::Drawing::Point( 16, 24 );
}
TextBox1->Text = String::Format( "Left = {0} Top = {1}", TextBox1->Left, TextBox1->Top );
}
};
public ref class LayoutForm: public System::Windows::Forms::Form
{
public:
LayoutForm()
: Form()
{
InitializeComponent();
}
public private:
System::Windows::Forms::Button^ Button1;
System::Windows::Forms::Button^ Button2;
LayoutControl^ LayoutControl1;
System::Windows::Forms::Button^ Button3;
private:
void InitializeComponent()
{
this->Button1 = gcnew System::Windows::Forms::Button;
this->Button2 = gcnew System::Windows::Forms::Button;
this->Button3 = gcnew System::Windows::Forms::Button;
this->LayoutControl1 = gcnew LayoutControl;
this->SuspendLayout();
this->Button1->Location = System::Drawing::Point( 16, 16 );
this->Button1->Name = "Button1";
this->Button1->Size = System::Drawing::Size( 120, 32 );
this->Button1->TabIndex = 0;
this->Button1->Text = "Center textbox on control";
this->Button2->Location = System::Drawing::Point( 152, 16 );
this->Button2->Name = "Button2";
this->Button2->Size = System::Drawing::Size( 104, 32 );
this->Button2->TabIndex = 3;
this->Button2->Text = "Shrink user control";
this->Button3->Location = System::Drawing::Point( 96, 232 );
this->Button3->Name = "Button3";
this->Button3->TabIndex = 5;
this->Button3->Text = "Reset";
this->LayoutControl1->BackColor = System::Drawing::SystemColors::ControlDark;
this->LayoutControl1->Location = System::Drawing::Point( 72, 64 );
this->LayoutControl1->Name = "LayoutControl1";
this->LayoutControl1->Size = System::Drawing::Size( 150, 160 );
this->LayoutControl1->TabIndex = 6;
this->ClientSize = System::Drawing::Size( 292, 266 );
this->Controls->Add( this->Button3 );
this->Controls->Add( this->Button2 );
this->Controls->Add( this->Button1 );
this->Controls->Add( this->LayoutControl1 );
this->Name = "Form1";
this->Text = "Form1";
this->ResumeLayout( false );
this->Button1->Click += gcnew System::EventHandler( this,&LayoutForm::Button1_Click );
this->Button2->Click += gcnew System::EventHandler( this,&LayoutForm::Button2_Click );
this->Button3->Click += gcnew System::EventHandler( this,&LayoutForm::Button3_Click );
}
// This method explicitly calls raises the layout event on
// LayoutControl1, changing the Bounds property.
void Button1_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
LayoutControl1->PerformLayout( LayoutControl1, "Bounds" );
}
// This resize of LayoutControl1 implicitly triggers the layout event.
// Changing the size of the control affects its Bounds property.
void Button2_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
LayoutControl1->Size = System::Drawing::Size( 100, 100 );
}
// This method explicitly calls PerformLayout with no parameters,
// which raises the Layout event with the LayoutEventArgs properties
// equal to Nothing.
void Button3_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
LayoutControl1->PerformLayout();
}
};
[System::STAThread]
int main()
{
Application::Run( gcnew LayoutForm );
}
using System.Windows.Forms;
using System.Drawing;
public class LayoutForm:
System.Windows.Forms.Form
{
public LayoutForm() : base()
{
InitializeComponent();
}
internal System.Windows.Forms.Button Button1;
internal System.Windows.Forms.Button Button2;
internal LayoutControl LayoutControl1;
internal System.Windows.Forms.Button Button3;
private void InitializeComponent()
{
this.Button1 = new System.Windows.Forms.Button();
this.Button2 = new System.Windows.Forms.Button();
this.Button3 = new System.Windows.Forms.Button();
this.LayoutControl1 = new LayoutControl();
this.SuspendLayout();
this.Button1.Location = new System.Drawing.Point(16, 16);
this.Button1.Name = "Button1";
this.Button1.Size = new System.Drawing.Size(120, 32);
this.Button1.TabIndex = 0;
this.Button1.Text = "Center textbox on control";
this.Button2.Location = new System.Drawing.Point(152, 16);
this.Button2.Name = "Button2";
this.Button2.Size = new System.Drawing.Size(104, 32);
this.Button2.TabIndex = 3;
this.Button2.Text = "Shrink user control";
this.Button3.Location = new System.Drawing.Point(96, 232);
this.Button3.Name = "Button3";
this.Button3.TabIndex = 5;
this.Button3.Text = "Reset";
this.LayoutControl1.BackColor = System.Drawing.SystemColors.ControlDark;
this.LayoutControl1.Location = new System.Drawing.Point(72, 64);
this.LayoutControl1.Name = "LayoutControl1";
this.LayoutControl1.Size = new System.Drawing.Size(150, 160);
this.LayoutControl1.TabIndex = 6;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.Button3);
this.Controls.Add(this.Button2);
this.Controls.Add(this.Button1);
this.Controls.Add(this.LayoutControl1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.Button1.Click += new System.EventHandler(Button1_Click);
this.Button2.Click += new System.EventHandler(Button2_Click);
this.Button3.Click += new System.EventHandler(Button3_Click);
}
[System.STAThread]
public static void Main()
{
Application.Run(new LayoutForm());
}
// This method explicitly calls raises the layout event on
// LayoutControl1, changing the Bounds property.
private void Button1_Click(System.Object sender, System.EventArgs e)
{
LayoutControl1.PerformLayout(LayoutControl1, "Bounds");
}
// This resize of LayoutControl1 implicitly triggers the layout event.
// Changing the size of the control affects its Bounds property.
private void Button2_Click(System.Object sender, System.EventArgs e)
{
LayoutControl1.Size = new System.Drawing.Size(100, 100);
}
// This method explicitly calls PerformLayout with no parameters,
// which raises the Layout event with the LayoutEventArgs properties
// equal to Nothing.
private void Button3_Click(System.Object sender, System.EventArgs e)
{
LayoutControl1.PerformLayout();
}
}
// This custom control has the Layout event implented so that when
// PerformLayout(AffectedControl, AffectedProperty) is called
// on the control, where AffectedProperty equals "Bounds" the
// textbox is centered on the control.
public class LayoutControl:
System.Windows.Forms.UserControl
{
internal System.Windows.Forms.TextBox TextBox1;
public LayoutControl() : base()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.TextBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
this.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.TextBox1.Name = "TextBox1";
this.TextBox1.TabIndex = 0;
this.BackColor = System.Drawing.SystemColors.ControlDark;
this.Controls.Add(this.TextBox1);
this.Name = "LayoutControl";
this.ResumeLayout(false);
this.Layout += new LayoutEventHandler(LayoutControl_Layout);
}
// This method is called when the Layout event is fired.
// This happens by during the initial load, by calling PerformLayout
// or by resizing, adding or removing controls or other actions that
// affect how the control is laid out. This method checks the
// value of e.AffectedProperty and changes the look of the
// control accordingly.
private void LayoutControl_Layout(object sender,
System.Windows.Forms.LayoutEventArgs e)
{
if (e.AffectedProperty != null)
{
if (e.AffectedProperty.Equals("Bounds"))
{
TextBox1.Left = (this.Width-TextBox1.Width)/2;
TextBox1.Top = (this.Height-TextBox1.Height)/2;
}
}
else
{
this.Size = new System.Drawing.Size(150, 160);
TextBox1.Location = new System.Drawing.Point(16, 24);
}
TextBox1.Text = "Left = "+TextBox1.Left+" Top = "+TextBox1.Top;
}
}
Imports System.Windows.Forms
Imports System.Drawing
Public Class LayoutForm
Inherits System.Windows.Forms.Form
Public Sub New()
MyBase.New()
InitializeComponent()
End Sub
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents LayoutControl1 As LayoutControl
Friend WithEvents Button3 As System.Windows.Forms.Button
Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.Button2 = New System.Windows.Forms.Button
Me.Button3 = New System.Windows.Forms.Button
Me.LayoutControl1 = New LayoutControl
Me.SuspendLayout()
Me.Button1.Location = New System.Drawing.Point(16, 16)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(120, 32)
Me.Button1.TabIndex = 0
Me.Button1.Text = "Center textbox on control"
Me.Button2.Location = New System.Drawing.Point(152, 16)
Me.Button2.Name = "Button2"
Me.Button2.Size = New System.Drawing.Size(104, 32)
Me.Button2.TabIndex = 3
Me.Button2.Text = "Shrink user control"
Me.Button3.Location = New System.Drawing.Point(96, 232)
Me.Button3.Name = "Button3"
Me.Button3.TabIndex = 5
Me.Button3.Text = "Reset"
Me.LayoutControl1.BackColor = System.Drawing.SystemColors.ControlDark
Me.LayoutControl1.Location = New System.Drawing.Point(72, 64)
Me.LayoutControl1.Name = "LayoutControl1"
Me.LayoutControl1.Size = New System.Drawing.Size(150, 160)
Me.LayoutControl1.TabIndex = 6
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.Add(Me.Button3)
Me.Controls.Add(Me.Button2)
Me.Controls.Add(Me.Button1)
Me.Controls.Add(Me.LayoutControl1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
<System.STAThread()> Shared Sub Main()
Application.Run(New LayoutForm)
End Sub
' This method explicitly calls raises the layout event on
' LayoutControl1, changing the Bounds property.
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
LayoutControl1.PerformLayout(LayoutControl1, "Bounds")
End Sub
' This resize of LayoutControl1 implicitly triggers the layout event.
' Changing the size of the control affects its Bounds property.
Private Sub Button2_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button2.Click
LayoutControl1.Size = New System.Drawing.Size(100, 100)
End Sub
' This method explicitly calls PerformLayout with no parameters,
' which raises the Layout event with the LayoutEventArgs properties
' equal to Nothing.
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
LayoutControl1.PerformLayout()
End Sub
End Class
'This custom control has the Layout event implented so that when
'PerformLayout(AffectedControl, AffectedProperty) is called on the control,
'where AffectedProperty equals "Bounds" the textbox is centered on the control.
Public Class LayoutControl
Inherits System.Windows.Forms.UserControl
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
Public Sub New()
MyBase.New()
InitializeComponent()
End Sub
Private Sub InitializeComponent()
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.SuspendLayout()
Me.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.TabIndex = 0
Me.BackColor = System.Drawing.SystemColors.ControlDark
Me.Controls.Add(Me.TextBox1)
Me.Name = "LayoutControl"
Me.ResumeLayout(False)
End Sub
'This method is called when the Layout event is fired. This happens by during the initial load,
'by calling PerformLayout or by resizing, adding or removing controls or other actions that
'affect how the control is laid out. This method checks the value of e.AffectedProperty
'and changes the look of the control accordingly.
Private Sub LayoutControl_Layout(ByVal sender As Object, ByVal e As System.Windows.Forms.LayoutEventArgs) Handles MyBase.Layout
If e.AffectedProperty IsNot Nothing Then
If e.AffectedProperty.Equals("Bounds") Then
TextBox1.Left = (Me.Width - TextBox1.Width) / 2
TextBox1.Top = (Me.Height - TextBox1.Height) / 2
End If
Else
Me.Size = New System.Drawing.Size(150, 160)
TextBox1.Location = New System.Drawing.Point(16, 24)
End If
TextBox1.Text = "Left = " & TextBox1.Left & " Top = " & TextBox1.Top
End Sub
End Class
Poznámky
SuspendLayout Pokud byla metoda volána před voláním PerformLayout metody, Layout je událost potlačena.
Parametry affectedControl
a affectedProperty
lze nastavit na null
hodnotu . Tím se AffectedControl vlastnosti a AffectedProperty vytvořeného objektu LayoutEventArgs nastaví na null
.
Viz také
- ResumeLayout()
- LayoutEngine
- Layout
- PerformLayout()
- SuspendLayout()
- InitLayout()
- BackgroundImageLayout
Platí pro
PerformLayout()
Vynutí, aby ovládací prvek použil logiku rozložení na všechny jeho podřízené ovládací prvky.
public:
void PerformLayout();
public void PerformLayout ();
member this.PerformLayout : unit -> unit
Public Sub PerformLayout ()
Příklady
Následující příklad kódu ukazuje, jak použít metodu PerformLayout . Ukazuje také způsoby, jak je Layout událost vyvolána. V tomto příkladu obslužná rutina Click
události explicitně Button1
volá PerformLayout. Obslužná rutina Click
události implicitně Button2
volá PerformLayout.
PerformLayout je také volána při načtení formuláře.
Button3
vrátí ovládací prvek do stavu, ve který byl při načtení. V každém případě Layout se vyvolá událost.
Toto je úplný příklad. Pokud chcete spustit příklad, vložte následující kód do prázdného formuláře.
using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;
// This custom control has the Layout event implented so that when
// PerformLayout(AffectedControl, AffectedProperty) is called
// on the control, where AffectedProperty equals "Bounds" the
// textbox is centered on the control.
public ref class LayoutControl: public System::Windows::Forms::UserControl
{
public private:
System::Windows::Forms::TextBox^ TextBox1;
public:
LayoutControl()
: UserControl()
{
InitializeComponent();
}
private:
void InitializeComponent()
{
this->TextBox1 = gcnew System::Windows::Forms::TextBox;
this->SuspendLayout();
this->TextBox1->BorderStyle = System::Windows::Forms::BorderStyle::FixedSingle;
this->TextBox1->Name = "TextBox1";
this->TextBox1->TabIndex = 0;
this->BackColor = System::Drawing::SystemColors::ControlDark;
this->Controls->Add( this->TextBox1 );
this->Name = "LayoutControl";
this->ResumeLayout( false );
this->Layout += gcnew LayoutEventHandler( this, &LayoutControl::LayoutControl_Layout );
}
// This method is called when the Layout event is fired.
// This happens by during the initial load, by calling PerformLayout
// or by resizing, adding or removing controls or other actions that
// affect how the control is laid out. This method checks the
// value of e.AffectedProperty and changes the look of the
// control accordingly.
void LayoutControl_Layout( Object^ /*sender*/, System::Windows::Forms::LayoutEventArgs^ e )
{
if ( e->AffectedProperty != nullptr )
{
if ( e->AffectedProperty->Equals( "Bounds" ) )
{
TextBox1->Left = (this->Width - TextBox1->Width) / 2;
TextBox1->Top = (this->Height - TextBox1->Height) / 2;
}
}
else
{
this->Size = System::Drawing::Size( 150, 160 );
TextBox1->Location = System::Drawing::Point( 16, 24 );
}
TextBox1->Text = String::Format( "Left = {0} Top = {1}", TextBox1->Left, TextBox1->Top );
}
};
public ref class LayoutForm: public System::Windows::Forms::Form
{
public:
LayoutForm()
: Form()
{
InitializeComponent();
}
public private:
System::Windows::Forms::Button^ Button1;
System::Windows::Forms::Button^ Button2;
LayoutControl^ LayoutControl1;
System::Windows::Forms::Button^ Button3;
private:
void InitializeComponent()
{
this->Button1 = gcnew System::Windows::Forms::Button;
this->Button2 = gcnew System::Windows::Forms::Button;
this->Button3 = gcnew System::Windows::Forms::Button;
this->LayoutControl1 = gcnew LayoutControl;
this->SuspendLayout();
this->Button1->Location = System::Drawing::Point( 16, 16 );
this->Button1->Name = "Button1";
this->Button1->Size = System::Drawing::Size( 120, 32 );
this->Button1->TabIndex = 0;
this->Button1->Text = "Center textbox on control";
this->Button2->Location = System::Drawing::Point( 152, 16 );
this->Button2->Name = "Button2";
this->Button2->Size = System::Drawing::Size( 104, 32 );
this->Button2->TabIndex = 3;
this->Button2->Text = "Shrink user control";
this->Button3->Location = System::Drawing::Point( 96, 232 );
this->Button3->Name = "Button3";
this->Button3->TabIndex = 5;
this->Button3->Text = "Reset";
this->LayoutControl1->BackColor = System::Drawing::SystemColors::ControlDark;
this->LayoutControl1->Location = System::Drawing::Point( 72, 64 );
this->LayoutControl1->Name = "LayoutControl1";
this->LayoutControl1->Size = System::Drawing::Size( 150, 160 );
this->LayoutControl1->TabIndex = 6;
this->ClientSize = System::Drawing::Size( 292, 266 );
this->Controls->Add( this->Button3 );
this->Controls->Add( this->Button2 );
this->Controls->Add( this->Button1 );
this->Controls->Add( this->LayoutControl1 );
this->Name = "Form1";
this->Text = "Form1";
this->ResumeLayout( false );
this->Button1->Click += gcnew System::EventHandler( this,&LayoutForm::Button1_Click );
this->Button2->Click += gcnew System::EventHandler( this,&LayoutForm::Button2_Click );
this->Button3->Click += gcnew System::EventHandler( this,&LayoutForm::Button3_Click );
}
// This method explicitly calls raises the layout event on
// LayoutControl1, changing the Bounds property.
void Button1_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
LayoutControl1->PerformLayout( LayoutControl1, "Bounds" );
}
// This resize of LayoutControl1 implicitly triggers the layout event.
// Changing the size of the control affects its Bounds property.
void Button2_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
LayoutControl1->Size = System::Drawing::Size( 100, 100 );
}
// This method explicitly calls PerformLayout with no parameters,
// which raises the Layout event with the LayoutEventArgs properties
// equal to Nothing.
void Button3_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
LayoutControl1->PerformLayout();
}
};
[System::STAThread]
int main()
{
Application::Run( gcnew LayoutForm );
}
using System.Windows.Forms;
using System.Drawing;
public class LayoutForm:
System.Windows.Forms.Form
{
public LayoutForm() : base()
{
InitializeComponent();
}
internal System.Windows.Forms.Button Button1;
internal System.Windows.Forms.Button Button2;
internal LayoutControl LayoutControl1;
internal System.Windows.Forms.Button Button3;
private void InitializeComponent()
{
this.Button1 = new System.Windows.Forms.Button();
this.Button2 = new System.Windows.Forms.Button();
this.Button3 = new System.Windows.Forms.Button();
this.LayoutControl1 = new LayoutControl();
this.SuspendLayout();
this.Button1.Location = new System.Drawing.Point(16, 16);
this.Button1.Name = "Button1";
this.Button1.Size = new System.Drawing.Size(120, 32);
this.Button1.TabIndex = 0;
this.Button1.Text = "Center textbox on control";
this.Button2.Location = new System.Drawing.Point(152, 16);
this.Button2.Name = "Button2";
this.Button2.Size = new System.Drawing.Size(104, 32);
this.Button2.TabIndex = 3;
this.Button2.Text = "Shrink user control";
this.Button3.Location = new System.Drawing.Point(96, 232);
this.Button3.Name = "Button3";
this.Button3.TabIndex = 5;
this.Button3.Text = "Reset";
this.LayoutControl1.BackColor = System.Drawing.SystemColors.ControlDark;
this.LayoutControl1.Location = new System.Drawing.Point(72, 64);
this.LayoutControl1.Name = "LayoutControl1";
this.LayoutControl1.Size = new System.Drawing.Size(150, 160);
this.LayoutControl1.TabIndex = 6;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.Button3);
this.Controls.Add(this.Button2);
this.Controls.Add(this.Button1);
this.Controls.Add(this.LayoutControl1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.Button1.Click += new System.EventHandler(Button1_Click);
this.Button2.Click += new System.EventHandler(Button2_Click);
this.Button3.Click += new System.EventHandler(Button3_Click);
}
[System.STAThread]
public static void Main()
{
Application.Run(new LayoutForm());
}
// This method explicitly calls raises the layout event on
// LayoutControl1, changing the Bounds property.
private void Button1_Click(System.Object sender, System.EventArgs e)
{
LayoutControl1.PerformLayout(LayoutControl1, "Bounds");
}
// This resize of LayoutControl1 implicitly triggers the layout event.
// Changing the size of the control affects its Bounds property.
private void Button2_Click(System.Object sender, System.EventArgs e)
{
LayoutControl1.Size = new System.Drawing.Size(100, 100);
}
// This method explicitly calls PerformLayout with no parameters,
// which raises the Layout event with the LayoutEventArgs properties
// equal to Nothing.
private void Button3_Click(System.Object sender, System.EventArgs e)
{
LayoutControl1.PerformLayout();
}
}
// This custom control has the Layout event implented so that when
// PerformLayout(AffectedControl, AffectedProperty) is called
// on the control, where AffectedProperty equals "Bounds" the
// textbox is centered on the control.
public class LayoutControl:
System.Windows.Forms.UserControl
{
internal System.Windows.Forms.TextBox TextBox1;
public LayoutControl() : base()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.TextBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
this.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.TextBox1.Name = "TextBox1";
this.TextBox1.TabIndex = 0;
this.BackColor = System.Drawing.SystemColors.ControlDark;
this.Controls.Add(this.TextBox1);
this.Name = "LayoutControl";
this.ResumeLayout(false);
this.Layout += new LayoutEventHandler(LayoutControl_Layout);
}
// This method is called when the Layout event is fired.
// This happens by during the initial load, by calling PerformLayout
// or by resizing, adding or removing controls or other actions that
// affect how the control is laid out. This method checks the
// value of e.AffectedProperty and changes the look of the
// control accordingly.
private void LayoutControl_Layout(object sender,
System.Windows.Forms.LayoutEventArgs e)
{
if (e.AffectedProperty != null)
{
if (e.AffectedProperty.Equals("Bounds"))
{
TextBox1.Left = (this.Width-TextBox1.Width)/2;
TextBox1.Top = (this.Height-TextBox1.Height)/2;
}
}
else
{
this.Size = new System.Drawing.Size(150, 160);
TextBox1.Location = new System.Drawing.Point(16, 24);
}
TextBox1.Text = "Left = "+TextBox1.Left+" Top = "+TextBox1.Top;
}
}
Imports System.Windows.Forms
Imports System.Drawing
Public Class LayoutForm
Inherits System.Windows.Forms.Form
Public Sub New()
MyBase.New()
InitializeComponent()
End Sub
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents LayoutControl1 As LayoutControl
Friend WithEvents Button3 As System.Windows.Forms.Button
Private Sub InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.Button2 = New System.Windows.Forms.Button
Me.Button3 = New System.Windows.Forms.Button
Me.LayoutControl1 = New LayoutControl
Me.SuspendLayout()
Me.Button1.Location = New System.Drawing.Point(16, 16)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(120, 32)
Me.Button1.TabIndex = 0
Me.Button1.Text = "Center textbox on control"
Me.Button2.Location = New System.Drawing.Point(152, 16)
Me.Button2.Name = "Button2"
Me.Button2.Size = New System.Drawing.Size(104, 32)
Me.Button2.TabIndex = 3
Me.Button2.Text = "Shrink user control"
Me.Button3.Location = New System.Drawing.Point(96, 232)
Me.Button3.Name = "Button3"
Me.Button3.TabIndex = 5
Me.Button3.Text = "Reset"
Me.LayoutControl1.BackColor = System.Drawing.SystemColors.ControlDark
Me.LayoutControl1.Location = New System.Drawing.Point(72, 64)
Me.LayoutControl1.Name = "LayoutControl1"
Me.LayoutControl1.Size = New System.Drawing.Size(150, 160)
Me.LayoutControl1.TabIndex = 6
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.Add(Me.Button3)
Me.Controls.Add(Me.Button2)
Me.Controls.Add(Me.Button1)
Me.Controls.Add(Me.LayoutControl1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
<System.STAThread()> Shared Sub Main()
Application.Run(New LayoutForm)
End Sub
' This method explicitly calls raises the layout event on
' LayoutControl1, changing the Bounds property.
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
LayoutControl1.PerformLayout(LayoutControl1, "Bounds")
End Sub
' This resize of LayoutControl1 implicitly triggers the layout event.
' Changing the size of the control affects its Bounds property.
Private Sub Button2_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button2.Click
LayoutControl1.Size = New System.Drawing.Size(100, 100)
End Sub
' This method explicitly calls PerformLayout with no parameters,
' which raises the Layout event with the LayoutEventArgs properties
' equal to Nothing.
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
LayoutControl1.PerformLayout()
End Sub
End Class
'This custom control has the Layout event implented so that when
'PerformLayout(AffectedControl, AffectedProperty) is called on the control,
'where AffectedProperty equals "Bounds" the textbox is centered on the control.
Public Class LayoutControl
Inherits System.Windows.Forms.UserControl
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
Public Sub New()
MyBase.New()
InitializeComponent()
End Sub
Private Sub InitializeComponent()
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.SuspendLayout()
Me.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.TabIndex = 0
Me.BackColor = System.Drawing.SystemColors.ControlDark
Me.Controls.Add(Me.TextBox1)
Me.Name = "LayoutControl"
Me.ResumeLayout(False)
End Sub
'This method is called when the Layout event is fired. This happens by during the initial load,
'by calling PerformLayout or by resizing, adding or removing controls or other actions that
'affect how the control is laid out. This method checks the value of e.AffectedProperty
'and changes the look of the control accordingly.
Private Sub LayoutControl_Layout(ByVal sender As Object, ByVal e As System.Windows.Forms.LayoutEventArgs) Handles MyBase.Layout
If e.AffectedProperty IsNot Nothing Then
If e.AffectedProperty.Equals("Bounds") Then
TextBox1.Left = (Me.Width - TextBox1.Width) / 2
TextBox1.Top = (Me.Height - TextBox1.Height) / 2
End If
Else
Me.Size = New System.Drawing.Size(150, 160)
TextBox1.Location = New System.Drawing.Point(16, 24)
End If
TextBox1.Text = "Left = " & TextBox1.Left & " Top = " & TextBox1.Top
End Sub
End Class
Poznámky
SuspendLayout Pokud byla metoda volána před voláním PerformLayout metody, Layout je událost potlačena.
Vlastnosti AffectedControl a AffectedProperty vytvořeného objektu LayoutEventArgs jsou nastaveny na null
, pokud při PerformLayout zavolání metody nebyly poskytnuty žádné hodnoty.
Viz také
- ResumeLayout()
- LayoutEngine
- Layout
- PerformLayout()
- SuspendLayout()
- InitLayout()
- BackgroundImageLayout