/// <summary>
/// Constructor called to initialize the event args with the key pressed by the user.
/// </summary>
/// <param name="c"></param>
public KeyPressEventArgs(Textbox field, char c) {
_field = field;
_char = c;
}
/// <summary>
/// A method that loops and processes keystrokes until the form is complete,
/// either by <see cref="FormComplete">FormComplete</see> or
/// <see cref="FormCancelled">FormCancelled</see> events.
/// </summary>
private void LoopForKeypress() {
// Loop for keypresses. Since we're doing all the work of processing, we have
// to trap special keypresses and respond appropriately
while (true) {
// Blocks on the next function call.
ConsoleKeyInfo cki = Console.ReadKey(true);
ConsoleKey nKey = cki.Key;
// A key's been pressed. Figure out what to do.
// All actions will be against the current field, stored in _field.
char cChar = cki.KeyChar;
if (cChar != 0) { // Guard against unprintable chars.
KeyPressEventArgs kpea = new KeyPressEventArgs(_field, cChar);
if (_keyPressEvent != null)
_keyPressEvent(this, kpea);
if (!kpea.Cancel) { // Process the keystroke. It wasn't cancelled.
switch (nKey) {
case ConsoleKey.Backspace: // Backspace pressed
// Is there a character to backspace over?
if (_field.Text.Length > 0) {
_field.Text = _field.Text.Substring(0, _field.Text.Length - 1);
Refresh(_field);
}
break;
case ConsoleKey.Tab: // Tab -> Move to the next field.
if (cki.Modifiers == ConsoleModifiers.Shift) {
// Go backwards.
_currentField--;
// If we're at the first field, move to the last.
if (_currentField == -1)
_currentField = _textboxes.Count - 1;
} else {
// Go forwards
_currentField++;
// If we're in the last field already, move back to the first.
if (_currentField == _textboxes.Count)
_currentField = 0;
}
// Set the current field to the next one in the collection.
_field = _textboxes[_currentField];
_textboxes.FocusField = _field;
// Move the cursor to the location of the next field, accomodating
// any text that may already be there..
Console.SetCursorPosition(_field.Location.X + _field.Text.Length, _field.Location.Y);
break;
case ConsoleKey.Enter: // Enter -> Fire the complete event if it's wired.
if (_formCompleteEvent != null) {
FormCompleteEventArgs fcea = new FormCompleteEventArgs();
_formCompleteEvent(this, fcea);
// The listener of this event will set the Cancel field if they
// want to re-use the form. If not cancelled, the form will
// be destroyed.
if (!fcea.Cancel) {
// Get rid of this form. A new one will be displayed.
// Unusual to call Dispose() on oneself, but it saves a lot of
// code in the clients if this is the default behaviour, rather
// than forcing every single event to call Dispose() on the
// passed-in sender parameter.
((IDisposable)this).Dispose();
return;
} // else the current form will be reused. Go back for more keys.
}
break;
case ConsoleKey.Escape: // Esc -> Fire the cancelled event if it's wired.
if (this.FormCancelled != null) {
this.FormCancelled(this, System.EventArgs.Empty);
((IDisposable)this).Dispose();
return;
}
break;
default: // Any other keystroke
if (_field != null) { // May not be an active textbox.
if (_field.Text.Length < _field.Length) {
// The field is not yet full. It can be appended to.
_field.NonEventingText += cChar;
Console.ForegroundColor = _field.Foreground;
Console.BackgroundColor = _field.Background;
if (_field.PasswordChar != char.MinValue)
// It's a password field. Display the password character.
Console.Write(_field.PasswordChar);
else
// Not a password type field. Show the actual character.
Console.Write(cChar);
} // Field already full => no keystrokes accepted.
}
break;
} // Keystroke was not cancelled
} // Character was printable
} // End of switch statement
} // End loop for keypresses
}
/// <summary>
/// Draws the current form onto the console.
/// </summary>
/// <param name="clear">A <see cref="bool">bool</see> indicating whether or
/// not the screen should be cleared before it is redrawn.</param>
public void Render(bool clear) {
Console.ResetColor();
if (clear)
Console.Clear();
Console.Title = _name;
// Resize the window and the buffer to the form's size.
if (Console.BufferHeight != _height || Console.BufferWidth != _width) {
Console.SetWindowSize(_width, _height);
Console.SetBufferSize(_width, _height);
}
if (Console.WindowHeight != _height || Console.WindowWidth != _width) {
Console.SetBufferSize(_width, _height);
Console.SetWindowSize(_width, _height);
}
// Draw the lines first.
foreach (Line line in _lines) {
Console.BackgroundColor = line.Colour;
if (line.Orientation == Line.LineOrientation.Horizontal) {
// Instructions for drawing a horizontal line.
Console.SetCursorPosition(line.Location.X, line.Location.Y);
Console.Write(new string(' ', line.Length));
} else {
// Instructions for drawing a vertical line.
Int32 x = line.Location.X;
for (Int32 i = line.Location.Y; i < line.Location.Y + line.Length; i++) {
Console.SetCursorPosition(x, i);
Console.Write(" ");
}
}
}
// Draw the labels next.
foreach (Label label in _labels)
Refresh(label);
// Now draw the textboxes.
foreach (Textbox text in _textboxes)
Refresh(text);
// If any textboxes are defined for the form, pick the first one and position
// the cursor accordingly.
if (_textboxes.Count > 0) {
_field = _textboxes[0];
_textboxes.FocusField = _field;
Console.SetCursorPosition(_field.Location.X + _field.Text.Length, _field.Location.Y);
Console.CursorVisible = true;
} else
// Otherwise, hide the cursor.
Console.CursorVisible = false;
_labels.Rendered();
_textboxes.Rendered();
if (_keyThread.Name == null) {
// Start the thread that listens for keypresses.
_keyThread.Name = "Keypress loop for " + _name;
_keyThread.Start();
}
}
public void SetFocus(Textbox field) {
for (Int32 i = 0; i < _textboxes.Count; i++)
if (_textboxes[i] == field) {
_field = Textboxes[i];
_currentField = i;
Console.ForegroundColor = _field.Foreground;
Console.BackgroundColor = _field.Background;
Console.SetCursorPosition(_field.Location.X + _field.Text.Length, _field.Location.Y);
return;
}
throw new InvalidOperationException(field.Name + " not found.");
}
/// <summary>
/// Appends a <see cref="Textbox">Textbox</see> to the list.
/// </summary>
/// <param name="t">The <see cref="Textbox">Textbox</see> to add.</param>
public void Add(Textbox t) {
_textboxes.Add(t);
}
/// <summary>
/// Reads Xml when the <see cref="Textboxes">Textboxes</see> is to be deserialized
/// from a stream.</summary>
/// <param name="reader">The stream from which the object will be deserialized.</param>
void System.Xml.Serialization.IXmlSerializable.ReadXml(System.Xml.XmlReader reader) {
if (!reader.IsEmptyElement) {
while (reader.Read()) {
if (reader.NodeType == System.Xml.XmlNodeType.EndElement) {
reader.Read();
break;
}
Textbox textbox = new Textbox();
((IXmlSerializable)textbox).ReadXml(reader);
_textboxes.Add(textbox);
reader.Read();
}
} else
reader.Read();
}