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Class
SelectAllCommand
Inherits:TextCommand
Selects the whole text. Applies while the text is not empty and not already selected whole; the menu stays up over the new selection.
Whether invoking the command leaves the menu up, presented again over the selection the command leaves, as select-all does on the touch platforms. False by default: a command takes the menu down, and on Android a touch menu's selection with it, collapsed at its focus as Android's text view leaves it.
public override bool IsApplicable(in TextCommandContext context)Whether the command applies to the field's current state. A menu hides or disables a command that does not apply, and a command runs only while it applies.
public override void Execute(in TextCommandContext context)Runs the command against the field's current state, to which it applies (IsApplicable).