requestFocusOnTap property
final
Determine if the dropdown button requests focus and the on-screen virtual keyboard is shown in response to a touch event.
Ignored if a focusNode is explicitly provided (in which case, FocusNode.canRequestFocus controls the behavior).
Defaults to null, which enables platform-specific behavior:
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On mobile platforms, acts as if set to false; tapping on the text field and opening the menu will not cause a focus request and the virtual keyboard will not appear.
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On desktop platforms, acts as if set to true; the dropdown takes the focus when activated.
Set this to true or false explicitly to override the default behavior.
Implementation
final bool? requestFocusOnTap;