Make `Command` implementations platform-specific

This allows us to introduce a platform-specific `Action` to both `iced_native`
and `iced_web` and remove the `Clipboard` from `Application::update` to maintain
purity.

Additionally, this should let us implement further actions to let users query
and modify the shell environment (e.g. window, clipboard, and more!)

1 files changed, 3 insertions, 7 deletions

diff --git a/examples/download_progress/src/main.rs b/examples/download_progress/src/main.rs
index 6f844e66..cd024926 100644
--- a/examples/download_progress/src/main.rs
+++ b/examples/download_progress/src/main.rs
@@ -1,6 +1,6 @@
 use iced::{
-    button, executor, Align, Application, Button, Clipboard, Column, Command,
-    Container, Element, Length, ProgressBar, Settings, Subscription, Text,
+    button, executor, Align, Application, Button, Column, Command, Container,
+    Element, Length, ProgressBar, Settings, Subscription, Text,
 };
 
 mod download;
@@ -43,11 +43,7 @@ impl Application for Example {
         String::from("Download progress - Iced")
     }
 
-    fn update(
-        &mut self,
-        message: Message,
-        _clipboard: &mut Clipboard,
-    ) -> Command<Message> {
+    fn update(&mut self, message: Message) -> Command<Message> {
         match message {
             Message::Add => {
                 self.last_id = self.last_id + 1;