ToolStrip.WndProc メソッド
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)


すべてのメッセージは、PreProcessMessage メソッドを通じてフィルタ処理された後に WndProc メソッドに送られます。
WndProc メソッドは、Windows WindowProc 関数に正確に対応しています。Windows メッセージの処理方法の詳細については、MSDN ライブラリ (http://msdn.microsoft.com/library/ja) にある Windows プラットフォーム SDK リファレンスで、WindowProc 関数のドキュメントを参照してください。
継承時の注意 継承コントロールは、処理できないメッセージを処理するために、基本クラスの WndProc メソッドを呼び出す必要があります。
WndProc メソッドをオーバーライドして、Message 構造体で示されるオペレーティング システム メッセージを処理する方法を次のコード例に示します。この例の場合、WM_ACTIVEAPP オペレーティング システム メッセージは、別のアプリケーションがどのタイミングでアクティブになったかを判定するために処理されます。使用できる Message.Msg、Message.LParam、および Message.WParam の値については、MSDN ライブラリ (http://msdn.microsoft.com/library/ja) にあるプラットフォーム SDK のリファレンスを参照してください。実際の定数値は、プラットフォーム SDK (コア SDK セクション) のダウンロードに含まれている windows.h ヘッダー ファイルの中に見つけることができます。これは MSDN からも入手できます。
Imports System Imports System.Drawing Imports System.Windows.Forms Namespace csTempWindowsApplication1 Public Class Form1 Inherits System.Windows.Forms.Form ' Constant value was found in the "windows.h" header file. Private Const WM_ACTIVATEAPP As Integer = &H1C Private appActive As Boolean = True <STAThread()> _ Shared Sub Main() Application.Run(New Form1()) End Sub 'Main Public Sub New() MyBase.New() Me.Size = New System.Drawing.Size(300, 300) Me.Text = "Form1" Me.Font = New System.Drawing.Font("Microsoft Sans Serif", 18.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte)) End Sub Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs) ' Paint a string in different styles depending on whether the ' application is active. If (appActive) Then e.Graphics.FillRectangle(SystemBrushes.ActiveCaption, 20, 20, 260, 50) e.Graphics.DrawString("Application is active", Me.Font, SystemBrushes.ActiveCaptionText, 20, 20) Else e.Graphics.FillRectangle(SystemBrushes.InactiveCaption, 20, 20, 260, 50) e.Graphics.DrawString("Application is Inactive", Me.Font, SystemBrushes.ActiveCaptionText, 20, 20) End If End Sub <System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _ Protected Overrides Sub WndProc(ByRef m As Message) ' Listen for operating system messages Select Case (m.Msg) ' The WM_ACTIVATEAPP message occurs when the application ' becomes the active application or becomes inactive. Case WM_ACTIVATEAPP ' The WParam value identifies what is occurring. appActive = (m.WParam.ToInt32() <> 0) ' Invalidate to get new text painted. Me.Invalidate() End Select MyBase.WndProc(m) End Sub End Class End Namespace
using System; using System.Drawing; using System.Windows.Forms; namespace csTempWindowsApplication1 { public class Form1 : System.Windows.Forms.Form { // Constant value was found in the "windows.h" header file. private const int WM_ACTIVATEAPP = 0x001C; private bool appActive = true; [STAThread] static void Main() { Application.Run(new Form1()); } public Form1() { this.Size = new System.Drawing.Size(300 ,300); this.Text = "Form1"; this.Font = new System.Drawing.Font("Microsoft Sans Serif", 18F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); } protected override void OnPaint(PaintEventArgs e) { // Paint a string in different styles depending on whether the // application is active. if (appActive) { e.Graphics.FillRectangle(SystemBrushes.ActiveCaption,20,20,260,50); e.Graphics.DrawString("Application is active", this.Font, SystemBrushes.ActiveCaptionText, 20,20); } else { e.Graphics.FillRectangle(SystemBrushes.InactiveCaption,20,20,260 ,50); e.Graphics.DrawString("Application is Inactive", this.Font, SystemBrushes.ActiveCaptionText, 20,20); } } [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] protected override void WndProc(ref Message m) { // Listen for operating system messages. switch (m.Msg) { // The WM_ACTIVATEAPP message occurs when the application // becomes the active application or becomes inactive. case WM_ACTIVATEAPP: // The WParam value identifies what is occurring. appActive = (((int)m.WParam != 0)); // Invalidate to get new text painted. this.Invalidate(); break; } base.WndProc(ref m); } } }
using namespace System; using namespace System::Drawing; using namespace System::Windows::Forms; using namespace System::Security::Permissions; namespace csTempWindowsApplication1 { public ref class Form1: public System::Windows::Forms::Form { private: // Constant value was found in the "windows.h" header file. static const Int32 WM_ACTIVATEAPP = 0x001C; Boolean appActive; public: Form1() { appActive = true; this->Size = System::Drawing::Size( 300, 300 ); this->Text = "Form1"; this->Font = gcnew System::Drawing::Font( "Microsoft Sans Serif",18.0F,System::Drawing::FontStyle::Bold,System::Drawing::GraphicsUnit::Point,((System::Byte)(0)) ); } protected: virtual void OnPaint( PaintEventArgs^ e ) override { // Paint a string in different styles depending on whether the // application is active. if ( appActive ) { e->Graphics->FillRectangle( SystemBrushes::ActiveCaption, 20, 20, 260, 50 ); e->Graphics->DrawString( "Application is active", this->Font, SystemBrushes::ActiveCaptionText, 20, 20 ); } else { e->Graphics->FillRectangle( SystemBrushes::InactiveCaption, 20, 20, 260, 50 ); e->Graphics->DrawString( "Application is Inactive", this->Font, SystemBrushes::ActiveCaptionText, 20, 20 ); } } [SecurityPermission(SecurityAction::Demand, Flags=SecurityPermissionFlag::UnmanagedCode)] virtual void WndProc( Message% m ) override { // Listen for operating system messages. switch ( m.Msg ) { case WM_ACTIVATEAPP: // The WParam value identifies what is occurring. appActive = (int)m.WParam != 0; // Invalidate to get new text painted. this->Invalidate(); break; } Form::WndProc( m ); } }; } [STAThread] int main() { Application::Run( gcnew csTempWindowsApplication1::Form1 ); }
package JSLTempWindowsApplication1; import System.*; import System.Drawing.*; import System.Windows.Forms.*; import System.Security.Permissions.*; public class Form1 extends System.Windows.Forms.Form { // Constant value was found in the "windows.h" header file. private final int WM_ACTIVATEAPP = 0x1C; private boolean appActive = true; /** @attribute STAThread() */ public static void main(String[] args) { Application.Run(new Form1()); } //main public Form1() { this.set_Size(new System.Drawing.Size(300, 300)); this.set_Text("Form1"); this.set_Font(new System.Drawing.Font("Microsoft Sans Serif", 18, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, (ubyte)0)); } //Form1 protected void OnPaint(PaintEventArgs e) { // Paint a string in different styles depending on whether the // application is active. if (appActive) { e.get_Graphics().FillRectangle(SystemBrushes.get_ActiveCaption(), 20, 20, 260, 50); e.get_Graphics().DrawString("Application is active", this.get_Font(), SystemBrushes.get_ActiveCaptionText() , 20, 20); } else { e.get_Graphics().FillRectangle(SystemBrushes.get_InactiveCaption(), 20, 20, 260, 50); e.get_Graphics().DrawString("Application is Inactive", this.get_Font(), SystemBrushes.get_ActiveCaptionText() , 20, 20); } } //OnPaint /** @attribute SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode) */ protected void WndProc(/** @ref */Message m) { // Listen for operating system messages. switch (m.get_Msg()) { // The WM_ACTIVATEAPP message occurs when the application // becomes the active application or becomes inactive. case WM_ACTIVATEAPP: // The WParam value identifies what is occurring. appActive = m.get_WParam().ToInt32() != 0; // Invalidate to get new text painted. this.Invalidate(); break; } super.WndProc(m); } //WndProc } //Form1

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
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