private void search_input_TextChanged(object sender, EventArgs e)
/*Event trigger when a text input into search text box
* Used to catch the word from input string and call suggestion feature*/
{
//Identify the start position of latest word in search text box
int wordEndPosition = search_input.SelectionStart;
int currentPosition = wordEndPosition;
while (currentPosition > 0 && search_input.Text[currentPosition - 1] != ' ')
{
currentPosition--;
}
//Read out the last word
string word = search_input.Text.Substring(currentPosition, wordEndPosition - currentPosition);
//Process if the read word is not whitespace/null and is more than 2 characters.
if (!String.IsNullOrWhiteSpace(word) && (word.Length > 2))
{
//Get the suggest word(s) from the original word
string[] suggestword = LuceneSearch_app.AutoCompleteSuggestion(word);
//Fit 3 words at most into the suggest word labels
switch (suggestword.Length)
{
case 1:
autoText1.Text = suggestword[0];
autoText1.Visible = true;
SpellCheckLabel.Visible = true;
break;
case 2:
autoText1.Text = suggestword[0];
autoText1.Visible = true;
autoText2.Text = suggestword[1];
autoText2.Visible = true;
SpellCheckLabel.Visible = true;
break;
case 3:
autoText1.Text = suggestword[0];
autoText1.Visible = true;
autoText2.Text = suggestword[1];
autoText2.Visible = true;
autoText3.Text = suggestword[2];
autoText3.Visible = true;
SpellCheckLabel.Visible = true;
break;
default:
break;
}
}
else
{
//Disable all labels when there is nothing to suggest.
autoText1.Visible = false;
autoText2.Visible = false;
autoText3.Visible = false;
autoText1.Text = null;
SpellCheckLabel.Visible = false;
search_query.Visible = false;
}
}
