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);
}
}
}
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