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use Scalar;
use color::{Color, Colorable};
use elmesque::Element;
use frame::Frameable;
use graphics::character::CharacterCache;
use label::{FontSize, Labelable};
use mouse::Mouse;
use position::Positionable;
use theme::Theme;
use ui::GlyphCache;
use widget::{self, Widget};
pub struct Button<'a, F> {
common: widget::CommonBuilder,
maybe_label: Option<&'a str>,
maybe_react: Option<F>,
style: Style,
enabled: bool,
}
#[allow(missing_copy_implementations)]
#[derive(Clone, Debug, PartialEq, RustcEncodable, RustcDecodable)]
pub struct Style {
pub maybe_color: Option<Color>,
pub maybe_frame: Option<f64>,
pub maybe_frame_color: Option<Color>,
pub maybe_label_color: Option<Color>,
pub maybe_label_font_size: Option<u32>,
}
#[derive(Clone, Debug, PartialEq)]
pub struct State {
maybe_label: Option<String>,
interaction: Interaction,
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum Interaction {
Normal,
Highlighted,
Clicked,
}
impl State {
fn color(&self, color: Color) -> Color {
match self.interaction {
Interaction::Normal => color,
Interaction::Highlighted => color.highlighted(),
Interaction::Clicked => color.clicked(),
}
}
}
fn get_new_interaction(is_over: bool, prev: Interaction, mouse: Mouse) -> Interaction {
use mouse::ButtonState::{Down, Up};
use self::Interaction::{Normal, Highlighted, Clicked};
match (is_over, prev, mouse.left) {
(true, Normal, Down) => Normal,
(true, _, Down) => Clicked,
(true, _, Up) => Highlighted,
(false, Clicked, Down) => Clicked,
_ => Normal,
}
}
impl<'a, F> Button<'a, F> {
pub fn new() -> Button<'a, F> {
Button {
common: widget::CommonBuilder::new(),
maybe_react: None,
maybe_label: None,
style: Style::new(),
enabled: true,
}
}
pub fn react(mut self, reaction: F) -> Self {
self.maybe_react = Some(reaction);
self
}
pub fn enabled(mut self, flag: bool) -> Self {
self.enabled = flag;
self
}
}
impl<'a, F> Widget for Button<'a, F>
where
F: FnMut()
{
type State = State;
type Style = Style;
fn common(&self) -> &widget::CommonBuilder { &self.common }
fn common_mut(&mut self) -> &mut widget::CommonBuilder { &mut self.common }
fn unique_kind(&self) -> &'static str { "Button" }
fn init_state(&self) -> State {
State { maybe_label: None, interaction: Interaction::Normal }
}
fn style(&self) -> Style { self.style.clone() }
fn capture_mouse(prev: &State, new: &State) -> bool {
match (prev.interaction, new.interaction) {
(Interaction::Highlighted, Interaction::Clicked) => true,
_ => false,
}
}
fn uncapture_mouse(prev: &State, new: &State) -> bool {
match (prev.interaction, new.interaction) {
(Interaction::Clicked, Interaction::Highlighted) => true,
(Interaction::Clicked, Interaction::Normal) => true,
_ => false,
}
}
fn default_width<C: CharacterCache>(&self, theme: &Theme, _: &GlyphCache<C>) -> Scalar {
const DEFAULT_WIDTH: Scalar = 64.0;
self.common.maybe_width.or(theme.maybe_button.as_ref().map(|default| {
default.common.maybe_width.unwrap_or(DEFAULT_WIDTH)
})).unwrap_or(DEFAULT_WIDTH)
}
fn default_height(&self, theme: &Theme) -> Scalar {
const DEFAULT_HEIGHT: Scalar = 64.0;
self.common.maybe_height.or(theme.maybe_button.as_ref().map(|default| {
default.common.maybe_height.unwrap_or(DEFAULT_HEIGHT)
})).unwrap_or(DEFAULT_HEIGHT)
}
fn update<'b, 'c, C>(mut self, args: widget::UpdateArgs<'b, 'c, Self, C>) -> Option<State>
where C: CharacterCache,
{
use utils::is_over_rect;
let widget::UpdateArgs { prev_state, xy, dim, input, .. } = args;
let widget::State { ref state, .. } = *prev_state;
let maybe_mouse = input.maybe_mouse.map(|mouse| mouse.relative_to(xy));
let new_interaction = match (self.enabled, maybe_mouse) {
(false, _) | (true, None) => Interaction::Normal,
(true, Some(mouse)) => {
let is_over = is_over_rect([0.0, 0.0], mouse.xy, dim);
get_new_interaction(is_over, state.interaction, mouse)
},
};
if let (Interaction::Clicked, Interaction::Highlighted) =
(state.interaction, new_interaction) {
if let Some(ref mut react) = self.maybe_react { react() }
}
let new_state = || {
State {
maybe_label: self.maybe_label.as_ref().map(|label| label.to_string()),
interaction: new_interaction,
}
};
let state_has_changed = state.interaction != new_interaction
|| state.maybe_label.as_ref().map(|string| &string[..]) != self.maybe_label;
if state_has_changed { Some(new_state()) } else { None }
}
fn draw<'b, C>(args: widget::DrawArgs<'b, Self, C>) -> Element
where C: CharacterCache,
{
use elmesque::form::{collage, rect, text};
let widget::DrawArgs { state, style, theme, .. } = args;
let widget::State { ref state, dim, xy, .. } = *state;
let color = state.color(style.color(theme));
let frame = style.frame(theme);
let frame_color = style.frame_color(theme);
let frame_form = rect(dim[0], dim[1]).filled(frame_color);
let (inner_w, inner_h) = (dim[0] - frame * 2.0, dim[1] - frame * 2.0);
let pressable_form = rect(inner_w, inner_h).filled(color);
let maybe_label_form = state.maybe_label.as_ref().map(|label_text| {
use elmesque::text::Text;
let label_color = style.label_color(theme);
let size = style.label_font_size(theme);
text(Text::from_string(label_text.to_string()).color(label_color).height(size as f64))
.shift(xy[0].floor(), xy[1].floor())
});
let form_chain = Some(frame_form).into_iter()
.chain(Some(pressable_form))
.map(|form| form.shift(xy[0], xy[1]))
.chain(maybe_label_form);
collage(dim[0] as i32, dim[1] as i32, form_chain.collect())
}
}
impl Style {
pub fn new() -> Style {
Style {
maybe_color: None,
maybe_frame: None,
maybe_frame_color: None,
maybe_label_color: None,
maybe_label_font_size: None,
}
}
pub fn color(&self, theme: &Theme) -> Color {
self.maybe_color.or(theme.maybe_button.as_ref().map(|default| {
default.style.maybe_color.unwrap_or(theme.shape_color)
})).unwrap_or(theme.shape_color)
}
pub fn frame(&self, theme: &Theme) -> f64 {
self.maybe_frame.or(theme.maybe_button.as_ref().map(|default| {
default.style.maybe_frame.unwrap_or(theme.frame_width)
})).unwrap_or(theme.frame_width)
}
pub fn frame_color(&self, theme: &Theme) -> Color {
self.maybe_frame_color.or(theme.maybe_button.as_ref().map(|default| {
default.style.maybe_frame_color.unwrap_or(theme.frame_color)
})).unwrap_or(theme.frame_color)
}
pub fn label_color(&self, theme: &Theme) -> Color {
self.maybe_label_color.or(theme.maybe_button.as_ref().map(|default| {
default.style.maybe_label_color.unwrap_or(theme.label_color)
})).unwrap_or(theme.label_color)
}
pub fn label_font_size(&self, theme: &Theme) -> FontSize {
self.maybe_label_font_size.or(theme.maybe_button.as_ref().map(|default| {
default.style.maybe_label_font_size.unwrap_or(theme.font_size_medium)
})).unwrap_or(theme.font_size_medium)
}
}
impl<'a, F> Colorable for Button<'a, F> {
fn color(mut self, color: Color) -> Self {
self.style.maybe_color = Some(color);
self
}
}
impl<'a, F> Frameable for Button<'a, F> {
fn frame(mut self, width: f64) -> Self {
self.style.maybe_frame = Some(width);
self
}
fn frame_color(mut self, color: Color) -> Self {
self.style.maybe_frame_color = Some(color);
self
}
}
impl<'a, F> Labelable<'a> for Button<'a, F> {
fn label(mut self, text: &'a str) -> Self {
self.maybe_label = Some(text);
self
}
fn label_color(mut self, color: Color) -> Self {
self.style.maybe_label_color = Some(color);
self
}
fn label_font_size(mut self, size: FontSize) -> Self {
self.style.maybe_label_font_size = Some(size);
self
}
}