20181031_blog_code01.cs

using System;
using System.ComponentModel.Composition;
using System.Runtime.InteropServices;

using Microsoft.VisualStudio;
using Microsoft.VisualStudio.Editor;
using Microsoft.VisualStudio.OLE.Interop;
using Microsoft.VisualStudio.Text.Editor;
using Microsoft.VisualStudio.TextManager.Interop;
using Microsoft.VisualStudio.Utilities;

/*
 * 必要な参照
 * System.ComponentModel.Composition
 * Microsoft.VisualStudio.Editor
 * Microsoft.VisualStudio.Shell.15.0
 * Microsoft.VisualStudio.OLE.Interop
 * Microsoft.VisualStudio.Text.UI
 * Microsoft.VisualStudio.Text.UI.Wpf
 * Microsoft.VisualStudio.TextManager.Interop
 * Microsoft.VisualStudio.CoreUtility
 */

namespace VSIXTest3
{
	[Export(typeof(IVsTextViewCreationListener))]
	[ContentType("text")]
	[TextViewRole(PredefinedTextViewRoles.Editable)]
	internal sealed class CommandHandlerProvider : IVsTextViewCreationListener
	{
		//! ビューの作成時に呼ばれる
		public void VsTextViewCreated(IVsTextView textViewAdapter)
		{
			ITextView view = _adapterService.GetWpfTextView(textViewAdapter);
			if( view == null ) return;

			//! フック用のクラス作成処理を登録
			view.Properties.GetOrCreateSingletonProperty(() => new CommandHandler(textViewAdapter));
		}

		[Import]
		internal IVsEditorAdaptersFactoryService	_adapterService	= null;
	}

	internal sealed class CommandHandler : IOleCommandTarget
	{
		//! コンストラクタ
		internal CommandHandler(IVsTextView adapter)
		{
			adapter.AddCommandFilter(this, out _nextCmdHdl);
		}

		public int QueryStatus(ref Guid pguidCmdGroup, uint cCmds, OLECMD[] prgCmds, IntPtr pCmdText)
		{
			return _nextCmdHdl.QueryStatus(ref pguidCmdGroup, cCmds, prgCmds, pCmdText);
		}

		public int Exec(ref Guid pguidCmdGroup, uint nCmdID, uint nCmdexecopt, IntPtr pvaIn, IntPtr pvaOut)
		{
			//! コマンドのグループGUIDによって、nCmdIDの解釈が変わる
			if( pguidCmdGroup == VSConstants.VSStd2K ) {

				//! 文字入力が行われた場合、入力された文字を判別して、'a'なら無視
				if( nCmdID == (uint)VSConstants.VSStd2KCmdID.TYPECHAR ) {
					var typedChar = (char)(ushort)Marshal.GetObjectForNativeVariant(pvaIn);
					if( typedChar == 'a' ) return VSConstants.S_OK;
				}
			}

			//! コマンド入力が行われた場合、「カット」は無視
			if( pguidCmdGroup == VSConstants.GUID_VSStandardCommandSet97 ) {
				if( nCmdID == (uint)VSConstants.VSStd97CmdID.Cut ) {
					return VSConstants.S_OK;
				}
			}

			//! 次のハンドラに処理を任せる
			return _nextCmdHdl.Exec(ref pguidCmdGroup, nCmdID, nCmdexecopt, pvaIn, pvaOut);
		}

		private IOleCommandTarget	_nextCmdHdl	= null;
	}
}