/// <summary>
/// Creates a new instance of the AutoCompleteMessageFilter
/// </summary>
/// <param name="autoCompleteForm">The auto complete form associated with the host rich text box control</param>
/// <remarks>The message filter is created and added to the message loop using the install function. The filter
/// is automatically disposed once the auto complete form is closed - the filter is automatically removed
/// from the message loop at this time.</remarks>
private AutoCompleteMessageFilter(frmAutoComplete autoCompleteForm)
{
AutoCompleteForm = autoCompleteForm;
AutoCompleteForm.Disposed += AutoCompleteForm_Disposed;
IsDisposed = false;
}
private void DoAutoComplete()
{
// create form if not exists
if (_autoCompleteForm == null)
{
// initialize and wire up new form
_autoCompleteForm = new frmAutoComplete();
_autoCompleteForm.AutoCompleteComplete += _autoCompleteForm_AutoCompleteComplete;
// install message filter to listen for lost focus
AutoCompleteMessageFilter.Install(_autoCompleteForm);
}
// set auto complete options
_currentInput = _hostInterface.GetCurrentInput();
_currentInputNode = _currentInput.GetNodeAtPosition(_hostInterface.InputPosition);
List <string> autoCompleteOptions = _provider.GetOptions(_currentInput, _currentInputNode);
if (autoCompleteOptions != null && autoCompleteOptions.Count == 1)
{
string value = autoCompleteOptions[0];
if (value.IndexOf(' ') > 0)
{
value = string.Format("\"{0}\"", value);
}
_hostInterface.ReplaceCurrentNode(value);
}
else if (autoCompleteOptions != null && autoCompleteOptions.Count > 1) // only show if options are available
{
_autoCompleteForm.SetAutoCompleteOptions(autoCompleteOptions);
// get the location of the caret, plus the line height as the auto complete form open point
_autoCompleteForm.Location = GetPopupLocation(_hostInterface.CaretLocation, _hostInterface.RTB.SelectionFont.Height);
// open the auto complete form
_autoCompleteForm.Show();
// adjust key input filter settings
_hostInterface.InputFilters.SetFilterMode(FilterMode.AutoComplete);
}
}
/// <summary>
/// Installs a new auto complete message filter into the message loop for the given auto complete form
/// </summary>
/// <param name="autoCompleteForm">The auto complete form for which to install the message filter</param>
public static void Install(frmAutoComplete autoCompleteForm)
{
Application.AddMessageFilter(new AutoCompleteMessageFilter(autoCompleteForm));
}