/// <summary>
/// Initializes a new instance of the Selection class by associating it with a TextBox derived object.
/// and then selecting text on it. </summary>
/// <param name="textBox">
/// The TextBox object for which the selection is being manipulated. </param>
/// <param name="start">
/// The zero-based position where to start the selection. </param>
/// <param name="end">
/// The zero-based position where to end the selection. If it's equal to the start position, no text is selected. </param>
/// <seealso cref="System.Windows.Forms.TextBox" />
public Selection(TextBox textBox, int start, int end)
{
this.textBox = textBox;
Set(start, end);
}
/// <summary>
/// Disables restoring of the textbox's selection when <see cref="Dispose" /> is called. </summary>
/// <seealso cref="Dispose" />
/// <seealso cref="Update" />
public void Disable() { textBox = null; }
/// <summary>
/// Initializes a new instance of the Selection class by associating it with a TextBox derived object. </summary>
/// <param name="textBox">
/// The TextBox object for which the selection is being manipulated. </param>
/// <seealso cref="System.Windows.Forms.TextBox" />
public Selection(TextBox textBox) { this.textBox = textBox; }
/// <summary>
/// Restores the selection on the textbox to the saved start and end values. </summary>
/// <remarks>
/// This method checks that the textbox is still <see cref="Disable">available</see>
/// and if so restores the selection. </remarks>
/// <seealso cref="Disable" />
public void Restore()
{
if (textBox == null)
return;
selection.Set(this.start, this.end);
textBox = null;
}
/// <summary>
/// Initializes a new instance of the Saver class by associating it with a TextBox derived object
/// and passing the start and end position of the selection. </summary>
/// <param name="textBox">
/// The TextBox object for which the selection is being saved. </param>
/// <param name="start">
/// The zero-based start position of the selection. </param>
/// <param name="end">
/// The zero-based end position of the selection. It must not be less than the start position. </param>
/// <remarks>
/// This constructor does not save the textbox's start and end position of the selection.
/// Instead, it saves the two given parameters. </remarks>
/// <seealso cref="System.Windows.Forms.TextBox" />
public Saver(TextBox textBox, int start, int end)
{
this.textBox = textBox;
selection = new Selection(textBox);
System.Diagnostics.Debug.Assert(start <= end);
this.start = start;
this.end = end;
}
/// <summary>
/// Initializes a new instance of the Saver class by associating it with a TextBox derived object. </summary>
/// <param name="textBox">
/// The TextBox object for which the selection is being saved. </param>
/// <remarks>
/// This constructor saves the textbox's start and end position of the selection inside private fields. </remarks>
/// <seealso cref="System.Windows.Forms.TextBox" />
public Saver(TextBox textBox)
{
this.textBox = textBox;
selection = new Selection(textBox);
selection.Get(out this.start, out this.end);
}