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bitflags! {
struct DisplayControlFlags: u8 {
const DISPLAY_CONTROL = 0b00001000;
const DISPLAY_ON = 0b00000100;
const CURSOR_ON = 0b00000010;
const CURSOR_BLINKING_ON = 0b00000001;
const DISPLAY_OFF = 0b00000000;
const CURSOR_OFF = 0b00000000;
const CURSOR_BLINKING_OFF = 0b00000000;
}
}
#[derive(Clone, Copy)]
pub enum DisplayState {
On,
Off,
}
impl From<DisplayState> for DisplayControlFlags {
fn from(state: DisplayState) -> Self {
match state {
DisplayState::On => DISPLAY_ON,
DisplayState::Off => DISPLAY_OFF,
}
}
}
#[derive(Clone, Copy)]
pub enum CursorState {
On,
Off,
}
impl From<CursorState> for DisplayControlFlags {
fn from(state: CursorState) -> Self {
match state {
CursorState::On => CURSOR_ON,
CursorState::Off => CURSOR_OFF,
}
}
}
#[derive(Clone, Copy)]
pub enum CursorBlinking {
On,
Off,
}
impl From<CursorBlinking> for DisplayControlFlags {
fn from(state: CursorBlinking) -> Self {
match state {
CursorBlinking::On => CURSOR_BLINKING_ON,
CursorBlinking::Off => CURSOR_BLINKING_OFF,
}
}
}
pub struct DisplayControlBuilder {
display: DisplayState,
cursor: CursorState,
blinking: CursorBlinking,
}
impl DisplayControlBuilder {
pub fn set_display(&mut self, state: DisplayState) -> &mut Self {
self.display = state;
self
}
pub fn set_cursor(&mut self, state: CursorState) -> &mut Self {
self.cursor = state;
self
}
pub fn set_cursor_blinking(&mut self, blinking: CursorBlinking) -> &mut Self {
self.blinking = blinking;
self
}
pub fn build_command(&self) -> u8 {
let mut cmd = DISPLAY_CONTROL;
cmd |= DisplayControlFlags::from(self.display);
cmd |= DisplayControlFlags::from(self.cursor);
cmd |= DisplayControlFlags::from(self.blinking);
cmd.bits()
}
}
impl Default for DisplayControlBuilder {
fn default() -> Self {
Self {
display: DisplayState::On,
cursor: CursorState::Off,
blinking: CursorBlinking::Off,
}
}
}