Editor Form : RichTextBox « GUI Windows Form « C# / C Sharp

1. C# / C Sharp
2. GUI Windows Form
3. RichTextBox

Editor Form

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow

Publisher: Peer Information
ISBN: 1861007663
*/
using System.Windows.Forms;
using System;
using System.Drawing;
using System.IO;


namespace Chapter2App
{
  public class EditorForm : System.Windows.Forms.Form 
  {
    // The RichTextBox control
    private RichTextBox richTxtBox;

    // constructor
    public EditorForm()
    {
      // Instantiate the richTextBox member
      this.richTxtBox = new RichTextBox();
      // Set the Dock style so that the control fills the Form
      this.richTxtBox.Dock = DockStyle.Fill;
      // Add the RichTextBox to the Form
      this.Controls.Add(this.richTxtBox);
    }

    public string EditText
    {
      get 
      {
        return this.richTxtBox.Text; 
      }
      set
      {
        richTxtBox.Text = value;
      }
    }
    
  }

  public class MyForm : System.Windows.Forms.Form 
  {
    private System.Windows.Forms.MainMenu mainMenu;
    private ToolBar toolBar;
    private StatusBar statusBar;

    // constructor
    public MyForm()
    {
      // set the title
      this.Text = "Hello world";
      // set the default size
      this.Size = new System.Drawing.Size(500,500);
      // set make the form non resizeable with sunken edge
      //this.FormBorderStyle = FormBorderStyle.Fixed3D;

      
      // Create the menu items
      MenuItem miNew = new MenuItem("&New",new EventHandler(OnMenuNew));
      // adding a "-" titled menu item adds a divider on the menu
      MenuItem miDash = new MenuItem("-");
      MenuItem miOpen = new MenuItem("&Open",new EventHandler(OnMenuOpen));
      MenuItem miSave = new MenuItem("&Save",new EventHandler(OnMenuSave));

      // Create the array of menu items which will form the submenu of File
      MenuItem[] fileMiArray = new MenuItem[] {miNew,miDash,miOpen,miSave};
      // create the File menu Item
      MenuItem miFile = new MenuItem("&File",fileMiArray );
      // Cretat the array of menu itme for the main menu
      MenuItem[] mainMiArray = new MenuItem[] {miFile};
      // Create the main menu
      this.mainMenu = new MainMenu(mainMiArray);

      // Another way of creating MainMenu object and attaching a MenuItem 
      //this.mainMenu = new MainMenu(); 
      //this.mainMenu.MenuItems.Add(miFile );


      // Add the Help menu using a different route
      MenuItem aboutMenuItem = new MenuItem();
      aboutMenuItem.Text = "&About";
      aboutMenuItem.Click += new EventHandler(OnMenuAbout);
      
      MenuItem helpMenuItem = new MenuItem();
      helpMenuItem.Text = "&Help";
      helpMenuItem.MenuItems.Add(aboutMenuItem);

      mainMenu.MenuItems.Add(helpMenuItem);
    

      // Attach the main menu object to the form
      this.Menu = this.mainMenu;


      // Context Menu 
      //MenuItem redContext = new MenuItem("Make Form Red",new EventHandler(OnContextRed));
      //MenuItem greyContext = new MenuItem("Make Form Grey",new EventHandler(OnContextGrey));

      //ContextMenu colorContextMenu = new ContextMenu(new MenuItem[] {redContext,greyContext});
      MenuItem colorContext = new MenuItem("Change the color of the Form",new EventHandler(OnContextColor));
      ContextMenu colorContextMenu = new ContextMenu(new MenuItem[] {colorContext});

      this.ContextMenu = colorContextMenu;

      // Make this Form a MDI container
      this.IsMdiContainer = true;

      // Toolbar

      // The ImageList of the toolbar
      ImageList imageLst = new ImageList();
      // Create Bitmap objects to add to the ImageList
      //Bitmap bmpStrip = new Bitmap("ToolBarStrip.bmp");
      Bitmap bmpStrip = new Bitmap(GetType(),"ToolBarStrip.bmp");
      imageLst.Images.AddStrip(bmpStrip);
      imageLst.TransparentColor = Color.Red;

      // Need the actual bmp files on the directory of the app!
      //Bitmap bmpNew = new Bitmap("NEW.bmp");
      //Bitmap bmpOpen = new Bitmap("OPEN.bmp");
      //Bitmap bmpSave = new Bitmap("SAVE.bmp");
      // Add the images created to the ImageList
      //imageLst.Images.Add(bmpNew);
      //imageLst.Images.Add(bmpOpen);
      //imageLst.Images.Add(bmpSave);
      // Set transparent color so that background dont show
      
      // Create the ToolBar object
      toolBar = new ToolBar();
      // Toolbar belongs to this Form
      toolBar.Parent = this;
      // ImageList is the one we just created
      toolBar.ImageList = imageLst;

      /*
      // Add 3 buttons
      for(int i=0; i< 3;i++)
      {
        // Create the buttons
        ToolBarButton toolBtn = new ToolBarButton();
        // Show the image i from the ImageList of the toolbar
        toolBtn.ImageIndex = i;
        // Add the button to the ToolBar
        toolBar.Buttons.Add(toolBtn);
      }
      */

      // Create the buttons
      ToolBarButton toolBtnNew = new ToolBarButton();
      ToolBarButton toolBtnOpen = new ToolBarButton();
      ToolBarButton toolBtnSave = new ToolBarButton();

      // Show the image i from the ImageList of the toolbar
      toolBtnNew.ImageIndex = 0;
      toolBtnOpen.ImageIndex = 1;
      toolBtnSave.ImageIndex = 2;

      // Add the appropriate menu items
      toolBtnNew.Tag =  miNew;
      toolBtnOpen.Tag = miOpen;
      toolBtnSave.Tag = miSave;

      // Add the button to the ToolBar
      toolBar.Buttons.Add(toolBtnNew);
      toolBar.Buttons.Add(toolBtnOpen);
      toolBar.Buttons.Add(toolBtnSave);

      // Wire the button click handler for the toolbar
      toolBar.ButtonClick += new ToolBarButtonClickEventHandler(ToolBarClick);

      
      statusBar = new StatusBar();
      //statusBar.Text = "I am a status bar";
      statusBar.ShowPanels = true;
      statusBar.Parent = this;

      // Create and the Help panel
      StatusBarPanel statusPanelHelp = new StatusBarPanel();
      statusPanelHelp.AutoSize = StatusBarPanelAutoSize.Spring;
      statusPanelHelp.Text = "This is the place for help!";

      statusBar.Panels.Add(statusPanelHelp);

      // Create and add the Date panel
      StatusBarPanel statusPanelDate = new StatusBarPanel();
      statusPanelDate.AutoSize = StatusBarPanelAutoSize.Contents;
      // Get todays date
      DateTime dt= DateTime.Now;
      statusPanelDate.Text = dt.ToShortDateString();

      statusBar.Panels.Add(statusPanelDate);

      // Wire the Closing event to the HandleClosing method
      // this.Closing += new System.ComponentModel.CancelEventHandler(HandleClosing);  
    }

    void ToolBarClick(object sender,ToolBarButtonClickEventArgs e)
    {
      MenuItem menuItemForButton = (MenuItem) e.Button.Tag;
      menuItemForButton.PerformClick();

      /*
      // Find out which button is clicked by their position
      switch(toolBar.Buttons.IndexOf(e.Button))
      {
        case 0:
          // First button is the New button
          // Call the menu handler but passing null on the 2nd param
          this.OnMenuNew(sender,null);
          break; 
        case 1:
          // Second button is the Open button
          this.OpenDocument();
          break; 
        case 2:
          // Third button is the Save button
          this.SaveActiveDocument();
          break; 
      }  
      */
    }

    
    void OnContextColor(object obj, EventArgs e)
    {
      ColorDialog colorDlg = new ColorDialog();
      if(colorDlg.ShowDialog() == DialogResult.OK)
      {

        // Grab the third child f this Form and set its color
        this.Controls[2].BackColor = colorDlg.Color;

        // Does't work after adding the status bar since the status bar becomes the second child
        // Grab the second child of this Form and set its color
        //this.Controls[1].BackColor = colorDlg.Color;

        // Doesn't work with toolbar, because toolbar becomes the first child:
        // Grab the first child control of this Form and set its color
        //this.Controls[0].BackColor = colorDlg.Color;
      }
      
      // Doesn't work for MDI container since this Form is hidden
      // by a new MDI child Form managing Form
      //this.BackColor = Color.Red;
    }

    void OnContextRed(object obj, EventArgs e)
    {
      
      // Grab the first child control of this Form and set its color
      this.Controls[1].BackColor = Color.Red;
      
      // Doesn't work for MDI container since this Form is hidden
      // by a new MDI child Form managing Form
      //this.BackColor = Color.Red;
    }

    void OnContextGrey(object obj, EventArgs e)
    {
      // Grab the first child control of this Form and set its color
      this.Controls[0].BackColor = Color.Gray;
      // Doesn't work for MDI ...
      //this.BackColor = Color.Gray;
    }

    void OnMenuAbout(object obj, EventArgs e)
    {
      // Forces the context menu for the main Form to pop up at 
      // the given position.
      this.ContextMenu.Show(this, new Point(20,100));
    }

    void OnMenuNew(object obj, EventArgs e)
    {
      // Instantiate our custom form and show it
      EditorForm editForm = new EditorForm();
      editForm.MdiParent = this;
      editForm.Show();

      // Count the number of MDI child Forms and set the title of the 
      // main form and the newly created Form
      editForm.Text = "Document " + this.MdiChildren.Length.ToString();
    }

    void OnMenuOpen(object obj, EventArgs e)
    {
      OpenDocument();
    }

    void OpenDocument()
    {
      OpenFileDialog openDlg = new OpenFileDialog();
      openDlg.Filter = "Text Files|*.txt;*.text;*.doc|All Files|*.*";
         openDlg.InitialDirectory="C:\\";
       DialogResult dr = openDlg.ShowDialog();
      if(dr == DialogResult.OK)
      {
        // User click on Open
        // Open the file and get its content
        string txtFromFile = OpenFileAndReturnText(openDlg.FileName);

        // Instantiate our custom form and show it
        EditorForm editForm = new EditorForm();
        editForm.MdiParent = this;
        // Set the title of the Form
        editForm.Text = openDlg.FileName;
        // Set the contents of the Editor Form
        editForm.EditText = txtFromFile;
        editForm.Show();

      }
    }

    string OpenFileAndReturnText(string filename)
    {
      // Open the file given by param filname, read it 
      // and return content
      System.IO.StreamReader reader;
      try
      {
        reader = new System.IO.StreamReader(filename);
        return reader.ReadToEnd();
      }
      catch
      {
        MessageBox.Show("File could not be accessed");
        return "";
      }
    }

    void OnMenuSave(object obj, EventArgs e)
    {
      SaveActiveDocument();
    }

    protected void SaveActiveDocument()
    {
      // Get the active MDI child Form and cast it to the custom Form
      EditorForm activeForm = (EditorForm) this.ActiveMdiChild;

      if(activeForm != null)
      {
        // Instantiate the object
        SaveFileDialog saveDlg = new SaveFileDialog();
        // Set the suggested name
        saveDlg.FileName = activeForm.Text;
        saveDlg.InitialDirectory="C:\\";
            // Set filter, this also sets extension
        saveDlg.Filter = "Text Files|*.txt; *.text; *.doc|All Files|*.*";
        // Let the dialog set extension 
        saveDlg.AddExtension = true;


        if(saveDlg.ShowDialog() == DialogResult.OK)
        {
               FileInfo fi = new FileInfo(saveDlg.FileName);
               StreamWriter sw = fi.CreateText();
               sw.Write(((EditorForm)this.ActiveMdiChild).EditText);
               sw.Close();
        }
      }
    }

    protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
    {
      // Create an instance of the form that is to shown modally.
      Form modalForm = new Form();

      // Create two buttons to use as the Yes and No buttons.
      Button yesButton = new Button ();
      Button noButton = new Button ();
      // Set the text of yes button.
      yesButton.Text = "Yes";
      // Set the position of the button on the form.
      yesButton.Location = new System.Drawing.Point (10, 10);
      // Set the text of no button.
      noButton.Text = "No";
      // Set the position of the button based on the location of the yes button.
      noButton.Location
        = new System.Drawing.Point (yesButton.Right + 10, yesButton.Top);
      
      // Set the caption bar text of the modal form.   
      modalForm.Text = "Are you sure you want to close??";
      // set the size
      modalForm.Size = new System.Drawing.Size(300,100);
      

      // Add DialogResult values of the button
      yesButton.DialogResult = DialogResult.Yes;
      noButton.DialogResult = DialogResult.No;

      // Add the buttons to the form.
      modalForm.Controls.Add(yesButton);
      modalForm.Controls.Add(noButton);
   
      // Display the form as a modal dialog box.
      if(modalForm.ShowDialog()== DialogResult.No)
      {
        // setting the Cancel property of the CancelEventArgs cancels 
        // the event and keeps the Form open
        e.Cancel = true;
      }
      else
      {
        // the Yes button was clicked so we need to do nothing
      }
      // Call the base method so that the event do get raised
      base.OnClosing(e);
    }
    

    static void HandleClosing(object sender, System.ComponentModel.CancelEventArgs e)
    {
      // Create an instance of the form that is to shown modally.
      Form modalForm = new Form();

      // Create two buttons to use as the Yes and No buttons.
      Button yesButton = new Button ();
      Button noButton = new Button ();
      // Set the text of yes button.
      yesButton.Text = "Yes";
      // Set the position of the button on the form.
      yesButton.Location = new System.Drawing.Point (10, 10);
      // Set the text of no button.
      noButton.Text = "No";
      // Set the position of the button based on the location of the yes button.
      noButton.Location
        = new System.Drawing.Point (yesButton.Right + 10, yesButton.Top);
      
      // Set the caption bar text of the modal form.   
      modalForm.Text = "Are you sure you want to close?";
      // set the size
      modalForm.Size = new System.Drawing.Size(300,100);
      

      // Add DialogResult values of the button
      yesButton.DialogResult = DialogResult.Yes;
      noButton.DialogResult = DialogResult.No;

      // Add the buttons to the form.
      modalForm.Controls.Add(yesButton);
      modalForm.Controls.Add(noButton);
   
      // Display the form as a modal dialog box.
      if(modalForm.ShowDialog()== DialogResult.No)
      {
        // setting the Cancel property of the CancelEventArgs cancels 
        // the event and keeps the Form open
        e.Cancel = true;
      }
      else
      {
        // the Yes button was clicked so we need to do nothing
        // the Form will close itself.
      }
    }

    static void Main()
    {
      //Instantiate the derived Form 
      MyForm myForm = new MyForm();
      // Start the app
      Application.Run(myForm);  
    }
  }
}



           
       

Chapter2App.zip( 38 k)

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