处理request close 事件, update函数返回Task

src/main.rs

@@ -1,16 +1,19 @@
-use iced::widget::{button, center, checkbox, column, container, horizontal_rule, pick_list, progress_bar, radio, row, scrollable, slider, text, text_editor, text_input, toggler, vertical_rule, vertical_space, Checkbox, Scrollable};
+mod download_wrapper;
-use iced::{Center, Element, Fill, Length, Size, Task, Theme};
+
-use iced::widget::scrollable::{scroll_to, AbsoluteOffset};
+
+use iced::widget::{button,  checkbox, column, container,  radio, row,  text_editor, text_input};
+use iced::{event, window, Element, Event, Length, Subscription, Task};
 use iced::widget::text_editor::Action::Scroll;
 use iced::widget::text_editor::Edit;
 
 pub fn main() ->iced::Result {
     iced::application("WisunDownload V0.1", MainWindow::update, MainWindow::view)
+        .subscription(MainWindow::subscription)
+        .exit_on_close_request(false)
         .window_size((830.0, 600.0))
         .run()
 }
 
-#[derive(Default)]
 struct MainWindow {
     is_online: bool,
     mysql_config: MysqlConfig,
@@ -19,6 +22,19 @@ struct MainWindow {
     log_content: text_editor::Content,
 }
 
+impl Default for MainWindow {
+   fn default() -> Self {
+       Self{
+           is_online: true,
+           mysql_config: MysqlConfig::default(),
+           selection: None,
+           label: String::new(),
+           log_content: text_editor::Content::default(),
+
+       }
+   }
+}
+
 #[derive(Debug, Clone, Default)]
 struct MysqlConfig{
     ip: String,
@@ -41,7 +57,9 @@ enum Message{
     TypeSelected(DownloadType),
     OnlineChecked(bool),
     AddLog(String),
-    LogContentChanged(text_editor::Action)
+    LogContentChanged(text_editor::Action),
+    SaveConfig,
+    WindowEvent(Event)
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -52,11 +70,11 @@ enum DownloadType{
 }
 
 impl MainWindow{
-    pub fn add_log(&mut self, msg: String){
+    pub fn add_log(&mut self, msg: String) -> Task<Message>{
         self.update(Message::AddLog(msg))
     }
 
-    fn update(&mut self, message: Message){
+    fn update(&mut self, message: Message)-> Task<Message>{
         match message{
             Message::Start() => {
                 println!("Start: {:?}", self.mysql_config);
@@ -67,33 +85,43 @@ impl MainWindow{
                 self.add_log("bbbbbbbbbbbbbbbb".to_string());
                 self.add_log("cccccccccccccccc".to_string());
                 println!("{:?}", self.log_content.text());
+                Task::none()
             }
             Message::IpChanged(ip) => {
                 self.mysql_config.ip = ip;
+                Task::none()
             }
             Message::PortChanged(port) => {
                 self.mysql_config.port = port;
+                Task::none()
             }
             Message::UsernameChanged(username)=>{
-                self.mysql_config.username = username
+                self.mysql_config.username = username;
+                Task::none()
             }
             Message::PasswordChanged(password)=>{
-                self.mysql_config.password = password
+                self.mysql_config.password = password;
+                Task::none()
             }
             Message::DatabaseChanged(database)=>{
-                self.mysql_config.database = database
+                self.mysql_config.database = database;
+                Task::none()
             }
             Message::WorkOrderChanged(work_order)=>{
-                self.mysql_config.work_order = work_order
+                self.mysql_config.work_order = work_order;
+                Task::none()
             }
             Message::TypeSelected(download_type)=>{
-                self.selection = Some(download_type)
+                self.selection = Some(download_type);
+                Task::none()
             }
             Message::LabelChanged(label)=>{
-                self.label = label
+                self.label = label;
+                Task::none()
             }
             Message::OnlineChecked(is_online)=>{
-                self.is_online = is_online
+                self.is_online = is_online;
+                Task::none()
             }
             Message::AddLog(log)=>{
                 for c in log.chars(){
@@ -102,14 +130,24 @@ impl MainWindow{
                 self.log_content.perform(text_editor::Action::Edit(Edit::Enter));
                 let line_size = self.log_content.lines().count();
                 self.log_content.perform(Scroll{lines: line_size as i32 });
+                Task::none()
             }
             Message::LogContentChanged(action)=>{
                 if action.is_edit(){
-                  return
+                  return Task::none()
                 }
-                self.log_content.perform(action)
+                self.log_content.perform(action);
+                Task::none()
             }
-            _=>{}
+           Message::WindowEvent(event) =>{
+               println!("{:?}", event);
+               if let Event::Window(window::Event::CloseRequested) = event {
+                   println!("Request Close");
+                   return window::get_latest().and_then(window::close)
+               };
+               Task::none()
+           }
+            _=>{Task::none()}
         }
     }
 
@@ -160,5 +198,7 @@ impl MainWindow{
         container.into()
     }
 
-
+    fn subscription(&self) -> Subscription<Message> {
+        event::listen().map(Message::WindowEvent)
+    }
 }