Editors to develop applications with KDE

Hi I want to know which text editors are good to develop applications with linux and which is the web site to download. The KDE Text Editor is horrible for me because when I am writting if the text line is too long the editor cut the line in the middle. I want a text editor with horizontal scroll bar. And if is possible, with the same frame window it can have more than one files opened like Ultraedit for windows. Thanks. Artur.