private static void InsertTextCore(
TextBox host,
string textToInsert,
int selectionStart,
int selectionLength)
{
// delete if overwriting something
if (selectionLength > 0)
{
DeleteSelectionCore(host, selectionStart, selectionLength);
}
// modify the string
if (selectionStart == host.DynamicString.Length)
{
host.DynamicString.Append(textToInsert);
}
else
{
host.DynamicString.Insert(selectionStart, textToInsert);
}
// update caret and selection
host.SetCaretPosition(selectionStart + textToInsert.Length);
}
public CaretPositionChangedEventArgs(
TextBox textControl,
int oldPosition,
int newPosition)
{
TextControl = textControl;
OldPosition = oldPosition;
NewPosition = newPosition;
}
public DeleteTextAction(
TextBox hostTextBox,
int selStart,
int selLength
)
: base(hostTextBox)
{
selectionStart = selStart;
selectionLength = selLength;
deletedText = Textbox.Text.Substring(selectionStart, selectionLength);
}
private static void DeleteSelectionCore(
TextBox host,
int selectionStart,
int selectionLength)
{
if (selectionLength <= 0)
{
return;
}
// modify the string
host.DynamicString.Remove(selectionStart, selectionLength);
// update caret and selection
host.SetCaretPosition(selectionStart);
}
public TextBoxAction(TextBox hostTextBox)
{
Textbox = hostTextBox;
}
public InsertTextAction(
TextBox hostTestBox,
string text,
int selStart,
int selLength
)
: base(hostTestBox)
{
selectionStart = selStart;
selectionLength = selLength;
textToInsert = text;
deletedText = Textbox.Text.Substring(selectionStart, selectionLength);
}
private void mMyTextBox_TextBoxChangePending(TextBox sender, TextBoxChangeEventArgs e)
{
if (this.ActionManager != null && ShouldRecordActions)
{
IAction a = e.Action;
e.Handled = true;
this.ActionManager.RecordAction(a);
}
}
public TextBoxBlock(string defaultText)
{
MyTextBox = new TextBox(defaultText);
Init();
}
public TextBoxBlock()
{
MyTextBox = new TextBox();
Init();
}