// CSharp Editor Example with Code Completion
// Copyright (c) 2006, Daniel Grunwald
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are 
// permitted provided that the following conditions are met:
// 
// - Redistributions of source code must retain the above copyright notice, this list 
//   of conditions and the following disclaimer.
// 
// - Redistributions in binary form must reproduce the above copyright notice, this list
//   of conditions and the following disclaimer in the documentation and/or other materials 
//   provided with the distribution.
// 
// - Neither the name of the ICSharpCode team nor the names of its contributors may be used to 
//   endorse or promote products derived from this software without specific prior written 
//   permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &AS IS& AND ANY EXPRESS 
// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
// IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

using System;

using ICSharpCode.TextEditor;
using ICSharpCode.TextEditor.Gui.CompletionWindow;

namespace HeuristicLab.CodeEditor {
  class CodeCompletionKeyHandler {
    CodeEditor codeEditor;
    TextEditorControl editor;
    CodeCompletionWindow codeCompletionWindow;

    private CodeCompletionKeyHandler(CodeEditor codeEditor, TextEditorControl editor) {
      this.codeEditor = codeEditor;
      this.editor = editor;
    }

    public static CodeCompletionKeyHandler Attach(CodeEditor codeEditor, TextEditorControl editor) {
      CodeCompletionKeyHandler h = new CodeCompletionKeyHandler(codeEditor, editor);

      editor.ActiveTextAreaControl.TextArea.KeyEventHandler += h.TextAreaKeyEventHandler;

      // When the editor is disposed, close the code completion window
      editor.Disposed += h.CloseCodeCompletionWindow;

      return h;
    }

    /// <summary>
    /// Return true to handle the keypress, return false to let the text area handle the keypress
    /// </summary>
    bool TextAreaKeyEventHandler(char key) {
      if (codeCompletionWindow != null) {
        // If completion window is open and wants to handle the key, don't let the text area
        // handle it
        if (codeCompletionWindow.ProcessKeyEvent(key))
          return true;
      }
      if (key == '.') {
        ICompletionDataProvider completionDataProvider = new CodeCompletionProvider(codeEditor);

        codeCompletionWindow = CodeCompletionWindow.ShowCompletionWindow(
          codeEditor.ParentForm,      // The parent window for the completion window
          editor,                   // The text editor to show the window for
          CodeEditor.DummyFileName,    // Filename - will be passed back to the provider
          completionDataProvider,    // Provider to get the list of possible completions
          key                        // Key pressed - will be passed to the provider
        );
        if (codeCompletionWindow != null) {
          // ShowCompletionWindow can return null when the provider returns an empty list
          codeCompletionWindow.Closed += new EventHandler(CloseCodeCompletionWindow);
        }
      }
      return false;
    }

    void CloseCodeCompletionWindow(object sender, EventArgs e) {
      if (codeCompletionWindow != null) {
        codeCompletionWindow.Closed -= new EventHandler(CloseCodeCompletionWindow);
        codeCompletionWindow.Dispose();
        codeCompletionWindow = null;
      }
    }
  }
}