Flutter Tutorial - Layout Widgets #5 Button Bar

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An end-aligned row of buttons, laying out into a column if there is not enough horizontal space.

Places the buttons horizontally according to the buttonPadding. The children are laid out in a Row with MainAxisAlignment.end. When the Directionality is TextDirection.ltr, the button bar's children are right justified and the last child becomes the rightmost child. When the Directionality TextDirection.rtl the children are left justified and the last child becomes the leftmost child.

If the button bar's width exceeds the maximum width constraint on the widget, it aligns its buttons in a column. The key difference here is that the MainAxisAlignment will then be treated as a cross-axis/horizontal alignment. For example, if the buttons overflow and ButtonBar.alignment was set to MainAxisAligment.start, the buttons would align to the horizontal start of the button bar.

The ButtonBar can be configured with a ButtonBarTheme. For any null property on the ButtonBar, the surrounding ButtonBarTheme's property will be used instead. If the ButtonBarTheme's property is null as well, the property will default to a value described in the field documentation below.

The children are wrapped in a ButtonTheme that is a copy of the surrounding ButtonTheme with the button properties overridden by the properties of the ButtonBar as described above. These properties include buttonTextTheme, buttonMinWidth, buttonHeight, buttonPadding, and buttonAlignedDropdown.

Used by Dialog to arrange the actions at the bottom of the dialog.


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