Problem

using System;
using System.IO;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
// FrameworkClasses
using FrameworkClasses.Common;
using FrameworkClasses.ModuleBase;
using FrameworkClasses.TaskBase;
using System.Windows.Input;
using Microsoft.Win32;
using System.Windows.Media;

namespace Module.Tasks.TaskReadingWindow
{
    public class TaskReadingWindowMain : TaskClassBase<TaskSetupBase, TaskParamsBase>
    {
        public const string TaskInternalName = "Reading";          // nazev tasku
        public static TaskEntry[] TaskEntries = new TaskEntry[]
        {
            new TaskEntry() { pictureName = "TaskPoints/PointsPic" }
        };

        private TextBox ReadingTextBox;

        private string buttonLoadText = EnumTaskType.LoadText.ToString();
        private string buttonOpacityPlus = EnumTaskType.OpacityPlus.ToString();
        private string buttonOpacityMinus = EnumTaskType.OpacityMinus.ToString();

        public enum EnumTaskType : byte
        {
            None = 0,
            LoadText = 1,
            OpacityPlus = 2,
            OpacityMinus = 3
        }
        private EnumTaskType taskType = EnumTaskType.None;

        // --- vytvoreni / inicializace / uzavreni ---

        // vytvoreni ulohy
        protected override void TaskOnCreate()
        {
            // udaje o uloze
            TaskDescItemAdd(EnumTaskDescItem.Name, TaskInternalName); // nazev ulohy
            TaskDescItemAdd(EnumTaskDescItem.Created, DateTime.ParseExact("2011y10m03d", "yyyy'y'MM'm'dd'd'", null)); // datum vytvoreni
            TaskDescItemAdd(EnumTaskDescItem.Version, new Version(1, 00, 00, 00)); // verze ulohy

            // polozky pro 'Info'
            InfoItemsDefault = TaskConstants.EnumInfoItemDefault.State | TaskConstants.EnumInfoItemDefault.Time;
            // povoleni zobrazeni a aktivita tlacitek
            ControlButtonsSet(EnumNumber.First, FrameworkConstants.ControlButtons.Start, FrameworkConstants.ControlButtons.Separator, FrameworkConstants.ControlButtons.Back, FrameworkConstants.ControlButtons.Separator, FrameworkConstants.ControlButtons.FullScreen);
            ControlButtonsSet(EnumNumber.Second, buttonLoadText, FrameworkConstants.ControlButtons.Separator, buttonOpacityPlus, buttonOpacityMinus);


            // nastaveni polozek pro zobrazeni
            taskGUIItems[EnumNumber.First] = new TaskGUIItem() { number = EnumNumber.First, guiItem = EnumGUIItem.Canvas };

        }

        Canvas canv;
        // nacteni / inicializace ulohy
        protected override void TaskOnInit()
        {
            canv = taskGUIItems[EnumNumber.First].canvas;
            string defaultPath = "c:\\Temp\\Zamboch - Visio in Extremis.txt";

            Brush backgroundColor = canv.Background;


            ReadingTextBox = new TextBox();
            ReadingTextBox.IsReadOnly = true;
            ReadingTextBox.Height = taskGUIItems[EnumNumber.First].canvas.ActualHeight;
            ReadingTextBox.Width = taskGUIItems[EnumNumber.First].canvas.ActualWidth;
            ReadingTextBox.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;

            loadText(defaultPath);

            canv.Children.Add(ReadingTextBox);
            var window = new CommonTestsAndGamesWIN00.MainWindow();
            window.KeyDown += new KeyEventHandler(OnKeyDown);
            ReadingTextBox.KeyDown += new KeyEventHandler(OnKeyDown);

        }

        private void loadText(string path)
        {
            string text = "";
            if (File.Exists(path))
            {
                text = File.ReadAllText(path, Encoding.GetEncoding("windows-1250"));
            }

            ReadingTextBox.Clear();
            ReadingTextBox.AppendText(text);
        }

        // uzavreni ulohy (EnumTaskState.Exit)
        protected override void TaskOnClose() { }

        // --- zmena velikosti / nastaveni / urovne ---

        // zmena velikosti plochy dialogu
        protected override void TaskOnSizeChange()
        {
            ReadingTextBox.Height = canv.ActualHeight;
            ReadingTextBox.Width = canv.ActualWidth;
        }
        // zena nastaveni ulohy (otevreni a zavreni gonfigurace ulohy)
        protected override void TaskOnSettingChange() { }
        // zmena / nastaveni urovne ulohy
        protected override void TaskOnLevelChange(TaskConstants.EnumLevelChange action) { }

        // --- ovladaci tlacitka ---

        // zpracovani vlastn9ch tlacitek
        protected override void TaskOnUserButton(string buttonIdent)
        {
            if (buttonIdent.Equals("LoadText"))
            {
                loadFile();
            }
        }

        private void loadFile()
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();

            openFileDialog.InitialDirectory = "c:\\";
            openFileDialog.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
            openFileDialog.FilterIndex = 2;
            openFileDialog.RestoreDirectory = true;
            bool result = (bool)openFileDialog.ShowDialog();
            if (result)
            {
                loadText(openFileDialog.FileName);
            }

        }
        // --- udalosti od 'Mouse' ---

        //protected override void TaskOnCanvasMousePosition(FrameworkConstants.EnumMouseAction mouseAction, Point position, EnumNumber number) { }
        //protected override void TaskOnCanvasMouseWheel(FrameworkConstants.EnumMouseAction mouseAction, int delta, EnumNumber number) { }
        //protected override void TaskOnGridMousePosition(FrameworkConstants.EnumMouseAction mouseAction, int col, int row, EnumNumber number) { }

        // --- dalsi udalosti od uzivatele ---
    //private void TextBox_KeyDown(object sender, KeyEventArgs e)
    //{
    //    if (e.Key == Key.Left)
    //    {
    //        MessageBox.Show("Left Key pressed");
    //    }
    //    else if (e.Key == Key.Right)
    //    {
    //        MessageBox.Show("Right Key pressed");
    //    }
    //    else
    //        MessageBox.Show(e.Key.ToString());
    //}

    protected void OnKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Left)
        {
            MessageBox.Show("Left Key pressed");
        }
        else if (e.Key == Key.Right)
        {
            MessageBox.Show("Right Key pressed");
        }
        else
        {
           MessageBox.Show(e.Key.ToString());
       }
    }

        // upusteni soubotu na 'Task'
    protected override void TaskOnDropFile(System.IO.FileInfo[] droppedFiles) { }


        // --- dalsi udalosti of 'Task' ---

        // tik interniho casovace v 'Tasl'
        protected override void TaskOnTimer()
        {
        }

        // --- rizeni stavoveho automatu ---
        //protected override void TaskAction(TaskConstants.EnumTaskAction action) { /* pri pretizeni je nutna vlastni implementace */  }

        // generovani noveho zadani -> EnumTaskState.Ready
        protected override TaskConstants.EnumTaskOnReturn TaskOnNew(TaskConstants.EnumTaskAction action) { return TaskConstants.EnumTaskOnReturn.OK; }
        // spusteni ulohy -> EnumTaskState.Run
        protected override TaskConstants.EnumTaskOnReturn TaskOnStart(TaskConstants.EnumTaskAction action) { return TaskConstants.EnumTaskOnReturn.OK; }
        // zda je dalsi krok ulohy (EnumTaskState.Run)
        protected override TaskConstants.EnumTaskOnReturn TaskOnNext(TaskConstants.EnumTaskAction action) { return TaskConstants.EnumTaskOnReturn.None; }
        // zastaveni ulohy -> EnumTaskState.Stop
        protected override TaskConstants.EnumTaskOnReturn TaskOnStop(TaskConstants.EnumTaskAction action) { return TaskConstants.EnumTaskOnReturn.OK; }
        // zda je konec ulohy -> EnumTaskState.Finish
        protected override TaskConstants.EnumTaskOnReturn TaskOnFinish(TaskConstants.EnumTaskAction action) { return TaskConstants.EnumTaskOnReturn.OK; }
        // zpracivani / ulozeni ziskanych dat z ulohy
        protected override TaskConstants.EnumTaskOnReturn TaskOnData(TaskConstants.EnumTaskAction action) { return TaskConstants.EnumTaskOnReturn.OK; }

    }
}