Transparent window does not work on master branch (regression from 0.13)

[rhysd]

Is your issue REALLY a bug?

• My issue is indeed a bug!
• I am not crazy! I will not fill out this form just to ask a question or request a feature. Pinky promise.

Is there an existing issue for this?

• I have searched the existing issues.

Is this issue related to iced?

• My hardware is compatible and my graphics drivers are up-to-date.

What happened?

I have created a minimal reproduction:

use iced::theme::Style;
use iced::widget::{container, text};
use iced::{Element, Length::Fill, Theme};

pub fn main() -> iced::Result {
    iced::application("Test", Test::update, Test::view)
        .transparent(true)
        .style(Test::style)
        .run()
}

#[derive(Default)]
struct Test;

impl Test {
    fn update(&mut self, _: ()) {}

    fn view(&self) -> impl Into<Element<()>> {
        container(text("This is test")).center(Fill)
    }

    fn style(&self, theme: &Theme) -> Style {
        Style {
            background_color: iced::Color::TRANSPARENT,
            text_color: theme.palette().text,
        }
    }
}

This example should create a transparent window, but it was actually opaque:

What is the expected behavior?

With iced v0.13.1, it works fine:

Here is the code (slightly modified due to API changes since 0.13):

use iced::daemon::Appearance;
use iced::widget::{container, text};
use iced::{Element, Length::Fill, Theme};

pub fn main() -> iced::Result {
    iced::application("Test", Test::update, Test::view)
        .transparent(true)
        .style(Test::style)
        .run()
}

#[derive(Default)]
struct Test;

impl Test {
    fn update(&mut self, _: ()) {}

    fn view(&self) -> impl Into<Element<()>> {
        container(text("This is test")).center(Fill)
    }

    fn style(&self, theme: &Theme) -> Appearance {
        Appearance {
            background_color: iced::Color::TRANSPARENT,
            text_color: theme.palette().text,
        }
    }
}

Version

master

Operating System

macOS

Do you have any log output?

No response

[rhysd]

I'm not sure but this looks related to the downgrade of winit crate.

• iced v0.13.1 uses winit 0.30.8 from crates.io
• iced master uses winit 0.30.1 from the forked repository

[rhysd]

I'm not sure but this looks related to the downgrade of winit crate.

I confirmed this. The following patch fixed this issue. Is there any reason to stick with winit 0.30.1? Or is it just out-dated?

diff --git a/Cargo.toml b/Cargo.toml
index 9059cfd9..f51b3717 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -189,7 +189,8 @@ web-time = "1.1"
 wgpu = "23.0"
 winapi = "0.3"
 window_clipboard = "0.4.1"
-winit = { git = "https://github.com/iced-rs/winit.git", rev = "254d6b3420ce4e674f516f7a2bd440665e05484d" }
+winit = "0.30"
 
 [workspace.lints.rust]
 rust_2018_idioms = { level = "forbid", priority = -1 }
diff --git a/winit/src/program.rs b/winit/src/program.rs
index 499c6252..3e04f52e 100644
--- a/winit/src/program.rs
+++ b/winit/src/program.rs
@@ -401,22 +401,22 @@ where
             );
         }
 
-        fn received_url(
-            &mut self,
-            event_loop: &winit::event_loop::ActiveEventLoop,
-            url: String,
-        ) {
-            self.process_event(
-                event_loop,
-                Event::EventLoopAwakened(
-                    winit::event::Event::PlatformSpecific(
-                        winit::event::PlatformSpecific::MacOS(
-                            winit::event::MacOS::ReceivedUrl(url),
-                        ),
-                    ),
-                ),
-            );
-        }
 
         fn about_to_wait(
             &mut self,
@@ -762,19 +762,19 @@ async fn run_instance<P, C>(
                             }
                         }
                     }
-                    event::Event::PlatformSpecific(
-                        event::PlatformSpecific::MacOS(
-                            event::MacOS::ReceivedUrl(url),
-                        ),
-                    ) => {
-                        runtime.broadcast(
-                            subscription::Event::PlatformSpecific(
-                                subscription::PlatformSpecific::MacOS(
-                                    subscription::MacOS::ReceivedUrl(url),
-                                ),
-                            ),
-                        );
-                    }
                     event::Event::UserEvent(action) => {
                         run_action(
                             action,

[rhysd]

I have created a PR to update our winit fork to v0.30.8 for fixing this issue at iced-rs/winit: iced-rs/winit#15