Code Style. Dart

Use this page to configure formatting options for Dart files. View the result in the Preview pane on the right.

Dartfmt

In this tab choose whether you want to format your Dart code using the dartfmt tool.

Use the dartfmt tool when formatting the whole file

When the checkbox is selected, dartfmt is applied when you reformat an entire file by pressing ⌥⌘L⌥⌘L⇧⌘F⌥F8 or choosing Code | Reformat Code. For reformatting a selected fragment of code the IntelliJ IDEA internal formatter is still used.

The file will be reformatted successfully only if the code is syntactically correct.
When this checkbox is cleared, dartfmt is never used and the code is always reformatted by the IntelliJ IDEA internal formatter.

Tabs and Indents

Use tab character	If this checkbox is selected, tab characters are used for indentation and for code reformatting. When the checkbox is cleared, IntelliJ IDEA uses spaces instead of tabs.
Smart tabs	An indentation consists of two parts. One part results from nesting code blocks and the other part is determined by alignment. If this checkbox is selected, the part that results from nesting contains both tabs and spaces (if necessary), while the part defined by alignment consists only of spaces. If this checkbox is cleared, only tabs are used. This means that after reformatting a group of spaces that fits the specified tab size is automatically replaced with a tab, which may result in breaking fine alignment.
Tab size	In this text box, specify the number of spaces that fits in a tab.
Indent	In this text box, specify the number of spaces (or tabs if the Use Tab Character checkbox is selected) to be inserted for each indent level.
Continuation indent	In this text box, specify the number of spaces (or tabs if the Use Tab Character checkbox is selected) to be inserted between the elements of an array, in expressions, method declarations, and method calls.
Keep indents on empty lines	If this checkbox is selected, IntelliJ IDEA retains indents on empty lines as if they contained some code. If the checkbox is cleared, IntelliJ IDEA deletes the tab characters and spaces on empty lines.

Spaces

Use this tab to specify where you want IntelliJ IDEA to insert spaces automatically. Select the checkboxes next to the description of relevant locations and check the results in the Preview pane.

Wrapping and braces

In this tab, customize the exceptions, brace placement and alignment options that IntelliJ IDEA will apply to various code constructs on reformatting the source code. Check the results in the Preview pane.

Alignment takes precedence over indentation options.

Hard wrap at

In this field, specify the number of spaces required to the right of an element. If you accept the Default option then the value from the global settings is used.

Wrap on typing

In this field, specify how the edited text is fitted in the specified Hard wrap at field.

Default - choose this option to use the Wrap on typing value from the global settings.
Yes - choose this option to use the value from the Right Margin field.
No - if you choose this option a line can exceed the value specified in the right margin.

Visual guides In this field, specify multiple right margins. You can leave a default value or enter the number of spaces for your margin. If you want to specify several margins, enter numbers separated by comma.

Keep when reformatting

Use the checkboxes to configure exceptions that IntelliJ IDEA will make when reformatting the source code. For example, by default, the Line breaks checkbox is selected. If your code contains lines that are shorter than a standard convention, you can convert them by disabling the Line breaks checkbox before reformatting.

Wrapping options

A wrapping style applies to various code constructs, specified in the left-hand pane (for example, method call arguments, or assignment statements).

Do not wrap	When this option is selected, no special wrapping style is applied, the nested alignment and braces settings are ignored.
Wrap if long	Select this option to wrap lines going beyond the right margin with proper indentation.
Wrap always	Select this option to wrap all elements in lists so that there is one element per line with proper indentation.
Chop down if long	Select this option to wrap elements in lists that go beyond the right margin so that there is one element per line with proper indentation.

Alignment options

Align when multiline	If this checkbox is selected, a code construct starts at the same column on each next line. Otherwise, the position of a code construct is determined by the current indentation level.
`<character(s)>` on next line	Select this checkbox to move the specified character or characters to the next line when the lines are wrapped.
'else' on new line	Use this checkbox to move the corresponding statements or characters to the next line.
New line after `<character>`	Select this checkbox to move the code after the specified character to a new line.
Special else if treatment	If this checkbox is selected, `else if` statements are located in the same line. Otherwise, `else if` statements are moved to the next line to the corresponding indent level.
Variable declarations	Choose one of the following options to configure alignment for equality signs: Do not align - the equality signs are not aligned. Align when multiline - the equality signs in multiline `var` statements are aligned by inserting additional spaces. Align when grouped - the equality signs in multiple `var` statements are aligned by inserting additional spaces.
ES6 import/export	Align 'from' clauses: When this checkbox is selected, IntelliJ IDEA aligns `import` and `export` statements in ECMAScript 6 code automatically making your code easier to read and maintain. Compare the appearance of a code fragment with alignment and without it in the Preview pane. With this option on, IntelliJ IDEA will align the new code on the fly. Existing `import` and `export` statements will be aligned after you reformat the code by pressing ⌥⌘L⌥⌘L⇧⌘F⌥F8, see the Reformat Source Code section for details.

Braces placement options

Braces placement style

Use this drop-down list to specify the position of the opening brace in class declarations, method declarations, function declarations, and other types of declarations. The available options are:

End of line - select this option to place the opening brace at the declaration line end.
Next line if wrapped - select this option to place the opening brace at the beginning of the line after the multiline declaration line.
Next line - select this option to place the opening brace at the beginning of the line after the declaration line.
Next line shifted - select this option to place the opening brace at the line after the declaration line being shifted to the corresponding indent level.
Next line each shifted - select this option to place the opening brace at the line after the declaration line being shifted to the corresponding indent level, and shift the next line to the next indent level as well.

Force braces

From this drop-down list, choose the braces introduction method for if, for, while, and do () while statements. The available options are:

Do not force - select this option to suppress introducing braces automatically.
When multiline - select this option to insert braces automatically if a statement occupies more than one line. Note that IntelliJ IDEA analyzes the number of lines in the entire statement but not only its condition.
Always - when this checkbox is selected, IntelliJ IDEA always inserts braces automatically.

Blank Lines

Use this tab to define where and how many blank lines you want IntelliJ IDEA to retain and insert in your code after reformatting. The results are displayed in the Preview pane.

Keep Maximum Blank Lines

In this area, specify the number of extra blank lines to be kept after reformatting.

Code Generation

On this tab, configure the code style for generated code.

Insert @override annotation

Set from

The link appears in the upper-right corner of the page, when applicable. Click this link and choose the language to be used as the base for the current language code style.

To return to the initial set of code style settings and discard the changes, click Reset.