Returns active keyboard layout index. [b]Note:[/b] This method is implemented on Linux, macOS and Windows. Returns the number of keyboard layouts. [b]Note:[/b] This method is implemented on Linux, macOS and Windows. Returns the ISO-639/BCP-47 language code of the keyboard layout at position [code]index[/code]. [b]Note:[/b] This method is implemented on Linux, macOS and Windows. Returns the localized name of the keyboard layout at position [code]index[/code]. [b]Note:[/b] This method is implemented on Linux, macOS and Windows. Sets active keyboard layout. [b]Note:[/b] This method is implemented on Linux, macOS and Windows. Return the greatest scale factor of all screens. [b]Note:[/b] On macOS returned value is [code]2.0[/code] if there is at least one hiDPI (Retina) screen in the system, and [code]1.0[/code] in all other cases. [b]Note:[/b] This method is implemented on macOS. Return the scale factor of the specified screen by index. [b]Note:[/b] On macOS returned value is [code]2.0[/code] for hiDPI (Retina) screen, and [code]1.0[/code] for all other cases. [b]Note:[/b] This method is implemented on macOS. Returns the on-screen keyboard's height in pixels. Returns 0 if there is no keyboard or if it is currently hidden. Hides the virtual keyboard if it is shown, does nothing otherwise. Shows the virtual keyboard if the platform has one. [code]existing_text[/code] parameter is useful for implementing your own [LineEdit] or [TextEdit], as it tells the virtual keyboard what text has already been typed (the virtual keyboard uses it for auto-correct and predictions). [code]position[/code] parameter is the screen space [Rect2] of the edited text. [code]multiline[/code] parameter needs to be set to [code]true[/code] to be able to enter multiple lines of text, as in [TextEdit]. [code]max_length[/code] limits the number of characters that can be entered if different from [code]-1[/code]. [code]cursor_start[/code] can optionally define the current text cursor position if [code]cursor_end[/code] is not set. [code]cursor_start[/code] and [code]cursor_end[/code] can optionally define the current text selection. [b]Note:[/b] This method is implemented on Android, iOS and UWP.