The text editor can perform various kinds of indentation. For assembler source files and plain text files, the editor automatically indents a line to match the previous line.

To indent several lines, select the lines and press the Tab key.

To move a whole block of lines back to the left again, press Shift+Tab.

For C/C++ source files, the editor indents lines according to the syntax of the C/C++ source code. This is performed whenever you:

To highlight matching parentheses with a light gray color, place the insertion point next to a parenthesis:

The highlight remains in place as long as the insertion point is located next to the parenthesis.

To select all text between the brackets surrounding the insertion point, choose Edit>Match Brackets. Every time you choose Match Brackets (grow) or Match Brackets (shrink) after that, the selection will increase or shrink, respectively, to the next hierarchic pair of brackets.

You can split the editor window horizontally into two panes, to look at different parts of the same source file at once, or to move text between two different locations.

To split a window into panes, use the Window>Split command.

To revert to a single pane, double-click the splitter control or drag it to the edge of the window.

To move text within an editor window or to copy between editor windows, select the text and drag it to the new location.

Sections of code can be hidden and displayed using code folding.

To collapse or expand groups of lines, click on the fold points in the fold margin:

The fold point positions are based on the hierarchical structure of the document contents, for example, brace characters in C/C++ or the element hierarchy of an XML file. The Toggle All Folds command (Ctrl+Alt+F) can be used for expanding (or collapsing) all folds in the current editor window. The command is available from the Edit menu and from the context menu in the editor window. You can enable or disable the fold margin from Tools>Options>Editor.

Word completion attempts to complete the word that you have started to type, basing the assumption on the contents of the rest of your document.

To make the editor complete the word that you have started to type, press Ctrl+Alt+Space or choose Complete Word from the context menu. If the suggestion is incorrect, repeat the command to get new suggestions.

By default, the editor automatically suggests completions while you type in a C/C++ source file. You can also open the code completion pop-up window manually by pressing Ctrl+Space.

To insert a suggestion, either click it or select it with the arrow keys, and press Enter. To close the code completion pop-up window without inserting anything, press Esc.

The suggestions come from the source browse information and require that the source file is part of a project that has been built at least once.

Many—but not all—of the suggested completions are identified by an icon:

	Class
	Enumeration
	Enumeration constant
	Function
	Macro
	Namespace
	Type definition
	Variable

To turn off automatic code completion, choose Tools>Options>Editor and deselect the option.

To make the editor suggest function parameters as tooltip information, start typing the first parenthesis after a function name. A tooltip is also shown when you type a comma in a parameter list.

When there are several overloaded versions of a function, they are all displayed:

Code templates are a method of conveniently inserting frequently used source code sequences, for example for loops and if statements. The code templates are defined in a plain text file. By default, a few example templates are provided. In addition, you can easily add your own code templates.

Use the Edit>Navigate>Toggle Bookmark command to add and remove bookmarks. To switch between the marked locations, choose Edit>Navigate>Navigate Next Bookmark or Navigate Previous Bookmark.