Function key_press_to_command_and_param

src/navigate.rs:629–713

(
    key: usize,
	shift_key: bool,
	control_key: bool,
	alt_key: bool,
	meta_key: bool,
)

}

fn key_press_to_command_and_param(
    key: usize,
	shift_key: bool,
	control_key: bool,
	alt_key: bool,
	meta_key: bool,
) -> Result<(NavigationCommand, NavigationParam)> {
	// key press mapping should probably be stored externally (registry) with an app that allows changes
	// for now, we build in the defaults

    // this is a hack to map alt+ctl+arrow to ctl+arrow to change table mappings (github.com/NSoiffer/MathCAT/issues/105)
    // if this change sticks, choose_command() needs to be changed and this hack should go away
    let mut alt_key = alt_key;
    if alt_key && control_key && [VK_LEFT, VK_RIGHT, VK_UP, VK_DOWN].contains(&key) {
        alt_key = false;
    }
	if alt_key || meta_key {
        bail!("Invalid argument to key_press_to_command_and_param");
    }

    let command;
    let param;
	match key {
        VK_LEFT => {
            command = choose_command(shift_key, control_key, NavigationCommand::Move,   NavigationCommand::Read,	NavigationCommand::Move,	   NavigationCommand::Describe);
            param =   choose_param(  shift_key, control_key, NavigationParam::Previous, NavigationParam::Previous, NavigationParam::CellPrevious, NavigationParam::Previous);
            },
        VK_RIGHT => {
            command = choose_command(shift_key, control_key, NavigationCommand::Move,	NavigationCommand::Read, NavigationCommand::Move,	  NavigationCommand::Describe);
            param =   choose_param(  shift_key, control_key, NavigationParam::Next, NavigationParam::Next, NavigationParam::CellNext, NavigationParam::Next);
            },
        VK_UP => {
            command = choose_command(shift_key, control_key, NavigationCommand::Zoom,      NavigationCommand::ChangeNavMode, NavigationCommand::Move,   NavigationCommand::Zoom);
            param =   choose_param(  shift_key, control_key, NavigationParam::Previous,  NavigationParam::Previous,      NavigationParam::CellUp, NavigationParam::Start);
            },
        VK_DOWN => {
            command = choose_command(shift_key, control_key, NavigationCommand::Zoom, NavigationCommand::ChangeNavMode, NavigationCommand::Move,     NavigationCommand::Zoom);
            param =   choose_param(  shift_key, control_key, NavigationParam::Next, NavigationParam::Next,          NavigationParam::CellDown, NavigationParam::End);
            },
        VK_RETURN => {
            command = choose_command(shift_key, control_key, NavigationCommand::Locate,  NavigationCommand::Last, NavigationCommand::Locate, NavigationCommand::Last);
            param =   choose_param(  shift_key, control_key, NavigationParam::Previous,NavigationParam::Last, NavigationParam::Last,    NavigationParam::Last);
            },
        VK_SPACE => {
            command = choose_command(shift_key, control_key, NavigationCommand::Read,		NavigationCommand::ToggleSpeakMode,    NavigationCommand::Read,        NavigationCommand::Describe);
            param =   choose_param(  shift_key, control_key, NavigationParam::Current, NavigationParam::Last,                NavigationParam::CellCurrent, NavigationParam::Current);
            },
    
        VK_HOME => {
            command = choose_command(shift_key, control_key, NavigationCommand::Move, NavigationCommand::Move,	   NavigationCommand::Move,      NavigationCommand::ReadTo);
            param =   choose_param(  shift_key, control_key, NavigationParam::Start,NavigationParam::ColStart, NavigationParam::LineStart, NavigationParam::Start);
            },
        VK_END => {
            command = choose_command(shift_key, control_key, NavigationCommand::Move, NavigationCommand::Move,   NavigationCommand::Move,    NavigationCommand::ReadTo);
            param =   choose_param(  shift_key, control_key, NavigationParam::End,  NavigationParam::ColEnd, NavigationParam::LineEnd, NavigationParam::End);
            },
        VK_BACK => {
            command = NavigationCommand::MoveLastLocation;