Use Task chaining to simplify multi_window example
This commit is contained in:
Héctor Ramón Jiménez
parent
b21e4567dc
commit
88b9384402
4 changed files with 107 additions and 96 deletions
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@ -1,16 +1,15 @@
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use iced::event;
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use iced::executor;
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use iced::multi_window::{self, Application};
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use iced::widget::{
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button, center, column, container, scrollable, text, text_input,
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button, center, column, container, horizontal_space, scrollable, text,
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text_input,
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};
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use iced::window;
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use iced::{
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Alignment, Element, Length, Point, Settings, Subscription, Task, Theme,
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Vector,
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Alignment, Element, Length, Settings, Subscription, Task, Theme, Vector,
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};
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use std::collections::HashMap;
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use std::collections::BTreeMap;
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fn main() -> iced::Result {
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Example::run(Settings::default())
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@ -18,8 +17,7 @@ fn main() -> iced::Result {
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#[derive(Default)]
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struct Example {
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windows: HashMap<window::Id, Window>,
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next_window_pos: window::Position,
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windows: BTreeMap<window::Id, Window>,
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}
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#[derive(Debug)]
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@ -33,13 +31,12 @@ struct Window {
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#[derive(Debug, Clone)]
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enum Message {
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OpenWindow,
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WindowOpened(window::Id),
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WindowClosed(window::Id),
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ScaleInputChanged(window::Id, String),
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ScaleChanged(window::Id, String),
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TitleChanged(window::Id, String),
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CloseWindow(window::Id),
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WindowOpened(window::Id, Option<Point>),
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WindowClosed(window::Id),
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NewWindow,
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}
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impl multi_window::Application for Example {
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@ -51,8 +48,7 @@ impl multi_window::Application for Example {
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fn new(_flags: ()) -> (Self, Task<Message>) {
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(
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Example {
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windows: HashMap::from([(window::Id::MAIN, Window::new(1))]),
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next_window_pos: window::Position::Default,
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windows: BTreeMap::from([(window::Id::MAIN, Window::new(1))]),
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},
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Task::none(),
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)
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@ -62,48 +58,36 @@ impl multi_window::Application for Example {
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self.windows
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.get(&window)
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.map(|window| window.title.clone())
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.unwrap_or("Example".to_string())
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.unwrap_or_default()
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}
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fn update(&mut self, message: Message) -> Task<Message> {
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match message {
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Message::ScaleInputChanged(id, scale) => {
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let window =
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self.windows.get_mut(&id).expect("Window not found!");
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window.scale_input = scale;
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Message::OpenWindow => {
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let Some(last_window) = self.windows.keys().last() else {
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return Task::none();
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};
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Task::none()
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window::fetch_position(*last_window)
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.then(|last_position| {
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let position = last_position.map_or(
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window::Position::Default,
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|last_position| {
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window::Position::Specific(
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last_position + Vector::new(20.0, 20.0),
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)
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},
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);
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window::open(window::Settings {
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position,
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..window::Settings::default()
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})
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})
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.map(Message::WindowOpened)
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}
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Message::ScaleChanged(id, scale) => {
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let window =
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self.windows.get_mut(&id).expect("Window not found!");
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window.current_scale = scale
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.parse::<f64>()
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.unwrap_or(window.current_scale)
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.clamp(0.5, 5.0);
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Task::none()
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}
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Message::TitleChanged(id, title) => {
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let window =
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self.windows.get_mut(&id).expect("Window not found.");
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window.title = title;
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Task::none()
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}
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Message::CloseWindow(id) => window::close(id),
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Message::WindowClosed(id) => {
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self.windows.remove(&id);
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Task::none()
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}
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Message::WindowOpened(id, position) => {
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if let Some(position) = position {
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self.next_window_pos = window::Position::Specific(
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position + Vector::new(20.0, 20.0),
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);
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}
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Message::WindowOpened(id) => {
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self.windows.insert(id, Window::new(self.windows.len() + 1));
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if let Some(window) = self.windows.get(&id) {
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text_input::focus(window.input_id.clone())
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@ -111,30 +95,52 @@ impl multi_window::Application for Example {
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Task::none()
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}
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}
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Message::NewWindow => {
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let count = self.windows.len() + 1;
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Message::WindowClosed(id) => {
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self.windows.remove(&id);
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let (id, spawn_window) = window::open(window::Settings {
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position: self.next_window_pos,
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exit_on_close_request: count % 2 == 0,
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..Default::default()
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});
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Task::none()
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}
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Message::ScaleInputChanged(id, scale) => {
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if let Some(window) = self.windows.get_mut(&id) {
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window.scale_input = scale;
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}
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self.windows.insert(id, Window::new(count));
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Task::none()
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}
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Message::ScaleChanged(id, scale) => {
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if let Some(window) = self.windows.get_mut(&id) {
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window.current_scale = scale
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.parse::<f64>()
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.unwrap_or(window.current_scale)
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.clamp(0.5, 5.0);
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}
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spawn_window
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Task::none()
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}
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Message::TitleChanged(id, title) => {
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if let Some(window) = self.windows.get_mut(&id) {
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window.title = title;
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}
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Task::none()
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}
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}
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}
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fn view(&self, window: window::Id) -> Element<Message> {
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let content = self.windows.get(&window).unwrap().view(window);
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center(content).into()
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fn view(&self, window_id: window::Id) -> Element<Message> {
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if let Some(window) = self.windows.get(&window_id) {
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center(window.view(window_id)).into()
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} else {
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horizontal_space().into()
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}
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}
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fn theme(&self, window: window::Id) -> Self::Theme {
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self.windows.get(&window).unwrap().theme.clone()
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fn theme(&self, window: window::Id) -> Theme {
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if let Some(window) = self.windows.get(&window) {
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window.theme.clone()
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} else {
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Theme::default()
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}
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}
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fn scale_factor(&self, window: window::Id) -> f64 {
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@ -145,24 +151,7 @@ impl multi_window::Application for Example {
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}
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fn subscription(&self) -> Subscription<Self::Message> {
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event::listen_with(|event, _, window| {
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if let iced::Event::Window(window_event) = event {
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match window_event {
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window::Event::CloseRequested => {
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Some(Message::CloseWindow(window))
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}
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window::Event::Opened { position, .. } => {
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Some(Message::WindowOpened(window, position))
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}
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window::Event::Closed => {
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Some(Message::WindowClosed(window))
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}
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_ => None,
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}
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} else {
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None
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}
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})
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window::closings().map(Message::WindowClosed)
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}
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}
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@ -200,7 +189,7 @@ impl Window {
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];
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let new_window_button =
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button(text("New Window")).on_press(Message::NewWindow);
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button(text("New Window")).on_press(Message::OpenWindow);
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let content = scrollable(
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column![scale_input, title_input, new_window_button]
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@ -34,7 +34,7 @@ struct Example {
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enum Message {
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Crop,
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Screenshot,
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ScreenshotData(Screenshot),
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Screenshotted(Screenshot),
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Png,
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PngSaved(Result<String, PngError>),
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XInputChanged(Option<u32>),
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@ -48,9 +48,9 @@ impl Example {
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match message {
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Message::Screenshot => {
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return iced::window::screenshot(window::Id::MAIN)
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.map(Message::ScreenshotData);
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.map(Message::Screenshotted);
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}
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Message::ScreenshotData(screenshot) => {
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Message::Screenshotted(screenshot) => {
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self.screenshot = Some(screenshot);
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}
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Message::Png => {
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