[WIP] Experimental iOS backend for druid-shell

druid-shell/Cargo.toml

@@ -41,7 +41,7 @@ serde = ["kurbo/serde"]
 [dependencies]
 # NOTE: When changing the piet or kurbo versions, ensure that
 #       the kurbo version included in piet is compatible with the kurbo version specified here.
-piet-common = "=0.5.0"
+piet-common = { git = "https://github.com/linebender/piet", rev = "57cc49a8a88703b1c754a8c2c7f6f96007a24d4d" }
 kurbo = "0.8.2"
 
 tracing = "0.1.22"
@@ -67,7 +67,7 @@ features = ["d2d1_1", "dwrite", "winbase", "libloaderapi", "errhandlingapi", "wi
             "d3d11", "dwmapi", "wincon", "fileapi", "processenv", "winbase", "handleapi",
             "shellapi", "winnls"]
 
-[target.'cfg(target_os="macos")'.dependencies]
+[target.'cfg(any(target_os="macos", target_os="ios"))'.dependencies]
 block = "0.1.6"
 cocoa = "0.24.0"
 objc = "0.2.7"
@@ -96,7 +96,7 @@ version = "0.3.44"
 features = ["Window", "MouseEvent", "CssStyleDeclaration", "WheelEvent", "KeyEvent", "KeyboardEvent", "Navigator"]
 
 [dev-dependencies]
-piet-common = { version = "=0.5.0", features = ["png"] }
+piet-common = { git = "https://github.com/linebender/piet", rev = "57cc49a8a88703b1c754a8c2c7f6f96007a24d4d", features = ["png"] }
 static_assertions = "1.1.0"
 test-log = { version = "0.2.5", features = ["trace"], default-features = false }
 tracing-subscriber = { version = "0.3.2", features = ["env-filter"] }

druid-shell/src/backend/ios/application.rs

@@ -0,0 +1,42 @@
+// Copyright 2022 The Druid Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! iOS implementation of features at the application scope.
+
+use crate::application::AppHandler;
+
+use super::clipboard::Clipboard;
+use super::error::Error;
+
+#[derive(Clone)]
+pub(crate) struct Application;
+
+impl Application {
+    pub fn new() -> Result<Application, Error> {
+        Ok(Application)
+    }
+
+    pub fn run(self, _handler: Option<Box<dyn AppHandler>>) {}
+
+    pub fn quit(&self) {}
+
+    pub fn clipboard(&self) -> Clipboard {
+        Clipboard
+    }
+
+    pub fn get_locale() -> String {
+        tracing::warn!("unimplemented");
+        "".to_string()
+    }
+}

druid-shell/src/backend/ios/clipboard.rs

@@ -0,0 +1,60 @@
+// Copyright 2022 The Druid Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Interactions with the system pasteboard on iOS.
+
+use crate::clipboard::{ClipboardFormat, FormatId};
+
+/// The browser clipboard.
+#[derive(Debug, Clone, Default)]
+pub struct Clipboard;
+
+impl Clipboard {
+    /// Put a string onto the system clipboard.
+    pub fn put_string(&mut self, _s: impl AsRef<str>) {
+        tracing::warn!("unimplemented");
+    }
+
+    /// Put multi-format data on the system clipboard.
+    pub fn put_formats(&mut self, _formats: &[ClipboardFormat]) {
+        tracing::warn!("unimplemented");
+    }
+
+    /// Get a string from the system clipboard, if one is available.
+    pub fn get_string(&self) -> Option<String> {
+        tracing::warn!("unimplemented");
+        None
+    }
+
+    /// Given a list of supported clipboard types, returns the supported type which has
+    /// highest priority on the system clipboard, or `None` if no types are supported.
+    pub fn preferred_format(&self, _formats: &[FormatId]) -> Option<FormatId> {
+        tracing::warn!("unimplemented");
+        None
+    }
+
+    /// Return data in a given format, if available.
+    ///
+    /// It is recommended that the `fmt` argument be a format returned by
+    /// [`Clipboard::preferred_format`]
+    pub fn get_format(&self, _format: FormatId) -> Option<Vec<u8>> {
+        tracing::warn!("unimplemented");
+        None
+    }
+
+    pub fn available_type_names(&self) -> Vec<String> {
+        tracing::warn!("unimplemented");
+        Vec::new()
+    }
+}

druid-shell/src/backend/ios/error.rs

@@ -0,0 +1,26 @@
+// Copyright 2022 The Druid Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! iOS backend errors.
+
+#[derive(Debug, Clone)]
+pub struct Error;
+
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "iOS Platform Error")
+    }
+}
+
+impl std::error::Error for Error {}

druid-shell/src/backend/ios/menu.rs

@@ -0,0 +1,15 @@
+// Copyright 2022 The Druid Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+pub use crate::backend::shared::noop_menu::*;

druid-shell/src/backend/ios/mod.rs

@@ -0,0 +1,24 @@
+// Copyright 2022 The Druid Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! macOS druid-shell backend.
+
+#![allow(clippy::let_unit_value)]
+
+pub mod application;
+pub mod clipboard;
+pub mod error;
+pub mod menu;
+pub mod screen;
+pub mod window;

druid-shell/src/backend/ios/screen.rs

@@ -0,0 +1,26 @@
+// Copyright 2022 The Druid Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! macOS Monitors and Screen information.
+
+use crate::kurbo::Rect;
+use crate::screen::Monitor;
+use cocoa::base::id;
+use cocoa::foundation::NSArray;
+use objc::{class, msg_send, sel, sel_impl};
+
+pub(crate) fn get_monitors() -> Vec<Monitor> {
+    tracing::warn!("unimplemented");
+    vec![]
+}