Merge branch 'master' into x11-cursors

CHANGELOG.md

@@ -42,10 +42,12 @@ You can find its changes [documented below](#070---2021-01-01).
 - Text input handles Delete key ([#1746] by [@bjorn])
 - `lens` macro can access nested fields ([#1764] by [@Maan2003])
 - X11 backend now supports custom cursors ([#1801] by [@psychon])
+- X11: Add support for transparent windows ([#1803] by [@psychon])
+- `has_focus` method on `WidgetPod` ([#1825] by [@ForLoveOfCats])
 
 ### Changed
 
-- Warn on unhandled Commands ([#1533] by [@Maan2003])
+- ~~Warn on unhandled Commands ([#1533] by [@Maan2003])~~ (Reverted in #1813)
 - `WindowDesc::new` takes the root widget directly instead of a closure ([#1559] by [@lassipulkkinen])
 - Switch to trace-based logging ([#1562] by [@PoignardAzur])
 - Spacers in `Flex` are now implemented by calculating the space in `Flex` instead of creating a widget for it ([#1584] by [@JAicewizard])
@@ -68,6 +70,7 @@ You can find its changes [documented below](#070---2021-01-01).
 - `Notification`s will not be delivered to the widget that sends them ([#1640] by [@cmyr])
 - `TextBox` can handle standard keyboard shortcuts without needing menus ([#1660] by [@cmyr])
 - GTK Shell: Prevent mangling of newline characters in clipboard ([#1695] by [@ForLoveOfCats])
+- GTK: Replaced call to `std::str::from_utf8_unchecked` with `from_utf8` ([#1820] by [@psychon])
 - Use correct fill rule when rendering SVG paths ([#1606] by [@SecondFlight])
 - Correctly capture and use stroke properties when rendering SVG paths ([#1647] by [@SecondFlight])
 - focus-chain now only includes non hidden (`should_propagate_to_hidden()` on `Event` and `Lifecylce`) widgets ([#1724] by [@xarvic])
@@ -728,6 +731,9 @@ Last release without a changelog :(
 [#1787]: https://github.com/linebender/druid/pull/1787
 [#1801]: https://github.com/linebender/druid/pull/1800
 [#1802]: https://github.com/linebender/druid/pull/1802
+[#1803]: https://github.com/linebender/druid/pull/1803
+[#1820]: https://github.com/linebender/druid/pull/1820
+[#1825]: https://github.com/linebender/druid/pull/1825
 
 [Unreleased]: https://github.com/linebender/druid/compare/v0.7.0...master
 [0.7.0]: https://github.com/linebender/druid/compare/v0.6.0...v0.7.0

druid-derive/src/attr.rs

@@ -52,7 +52,7 @@ pub enum FieldIdent {
 impl FieldIdent {
     pub fn unwrap_named(&self) -> syn::Ident {
         if let FieldIdent::Named(s) = self {
-            syn::Ident::new(&s, Span::call_site())
+            syn::Ident::new(s, Span::call_site())
         } else {
             panic!("Unwrap named called on unnamed FieldIdent");
         }
@@ -272,7 +272,7 @@ impl Field<LensAttrs> {
 impl<Attrs> Field<Attrs> {
     pub fn ident_tokens(&self) -> TokenTree {
         match self.ident {
-            FieldIdent::Named(ref s) => Ident::new(&s, Span::call_site()).into(),
+            FieldIdent::Named(ref s) => Ident::new(s, Span::call_site()).into(),
             FieldIdent::Unnamed(num) => Literal::usize_unsuffixed(num).into(),
         }
     }

druid-derive/src/data.rs

@@ -87,7 +87,7 @@ fn derive_enum(
     let impl_generics = generics_bounds(&input.generics);
     let (_, ty_generics, where_clause) = &input.generics.split_for_impl();
 
-    if is_c_style_enum(&s) {
+    if is_c_style_enum(s) {
         let res = quote! {
             impl<#impl_generics> ::druid::Data for #ident #ty_generics #where_clause {
                 fn same(&self, other: &Self) -> bool { self == other }

druid-derive/src/lens.rs

@@ -154,7 +154,7 @@ fn derive_struct(input: &syn::DeriveInput) -> Result<proc_macro2::TokenStream, s
 
     let associated_items = fields.iter().filter(|f| !f.attrs.ignore).map(|f| {
         let field_name = &f.ident.unwrap_named();
-        let lens_field_name = f.attrs.lens_name_override.as_ref().unwrap_or(&field_name);
+        let lens_field_name = f.attrs.lens_name_override.as_ref().unwrap_or(field_name);
 
         quote! {
             /// Lens for the corresponding field.

druid-shell/src/platform/gtk/clipboard.rs

@@ -64,8 +64,10 @@ impl Clipboard {
             let idx = idx as usize;
             if idx < formats.len() {
                 let item = &formats[idx];
-                if item.identifier == ClipboardFormat::TEXT {
-                    sel.set_text(unsafe { std::str::from_utf8_unchecked(&item.data) });
+                if let (ClipboardFormat::TEXT, Ok(data)) =
+                    (item.identifier, std::str::from_utf8(&item.data))
+                {
+                    sel.set_text(data);
                 } else {
                     let atom = Atom::intern(item.identifier);
                     let stride = 8;
@@ -130,7 +132,8 @@ impl Clipboard {
         let targets = clipboard.wait_for_targets().unwrap_or_default();
         targets
             .iter()
-            .map(|atom| unsafe { format!("{} ({})", atom.name(), atom.value()) })
+            // SAFETY: Atom::value() is 'self.0 as usize'. No idea why that is unsafe.
+            .map(|atom| format!("{} ({})", atom.name(), unsafe { atom.value() }))
             .collect()
     }
 }

druid-shell/src/platform/gtk/window.rs

@@ -430,7 +430,7 @@ impl WindowBuilder {
                         // region, because there might be parts of the drawing area that were
                         // invalidated by external forces).
                         let alloc = widget.get_allocation();
-                        context.set_source_surface(&surface, 0.0, 0.0);
+                        context.set_source_surface(surface, 0.0, 0.0);
                         context.rectangle(0.0, 0.0, alloc.width as f64, alloc.height as f64);
                         context.fill();
                     });
@@ -1170,7 +1170,7 @@ impl WindowHandle {
                 old_menubar.deactivate();
                 vbox.remove(first_child);
             }
-            let menubar = menu.into_gtk_menubar(&self, &accel_group);
+            let menubar = menu.into_gtk_menubar(self, &accel_group);
             vbox.pack_start(&menubar, false, false, 0);
             menubar.show_all();
         }
@@ -1234,7 +1234,7 @@ impl IdleHandle {
 fn run_idle(state: &Arc<WindowState>) -> glib::source::Continue {
     util::assert_main_thread();
     let result = state.with_handler(|handler| {
-        let queue: Vec<_> = std::mem::replace(&mut state.idle_queue.lock().unwrap(), Vec::new());
+        let queue: Vec<_> = std::mem::take(&mut state.idle_queue.lock().unwrap());
 
         for item in queue {
             match item {

druid-shell/src/platform/x11/application.rs

@@ -26,7 +26,9 @@ use x11rb::connection::{Connection, RequestConnection};
 use x11rb::protocol::present::ConnectionExt as _;
 use x11rb::protocol::render::{self, ConnectionExt as _, Pictformat};
 use x11rb::protocol::xfixes::ConnectionExt as _;
-use x11rb::protocol::xproto::{self, ConnectionExt, CreateWindowAux, EventMask, WindowClass};
+use x11rb::protocol::xproto::{
+    self, ConnectionExt, CreateWindowAux, EventMask, Visualtype, WindowClass,
+};
 use x11rb::protocol::Event;
 use x11rb::resource_manager::Database as ResourceDb;
 use x11rb::xcb_ffi::XCBConnection;
@@ -52,6 +54,11 @@ pub(crate) struct Application {
     /// `druid_shell::WindowHandle` to be `!Send` and `!Sync`.
     marker: std::marker::PhantomData<*mut XCBConnection>,
 
+    /// The type of visual used by the root window
+    root_visual_type: Visualtype,
+    /// The visual for windows with transparent backgrounds, if supported
+    argb_visual_type: Option<Visualtype>,
+
     /// The X11 resource database used to query dpi.
     pub(crate) rdb: Rc<ResourceDb>,
     pub(crate) cursors: Cursors,
@@ -189,6 +196,15 @@ impl Application {
             col_resize: load_cursor("col-resize"),
         };
 
+        let screen = connection
+            .setup()
+            .roots
+            .get(screen_num as usize)
+            .ok_or_else(|| anyhow!("Invalid screen num: {}", screen_num))?;
+        let root_visual_type = util::get_visual_from_screen(&screen)
+            .ok_or_else(|| anyhow!("Couldn't get visual from screen"))?;
+        let argb_visual_type = util::get_argb_visual_type(&*connection, &screen)?;
+
         Ok(Application {
             connection,
             rdb,
@@ -199,6 +215,8 @@ impl Application {
             cursors,
             idle_write,
             present_opcode,
+            root_visual_type,
+            argb_visual_type,
             marker: std::marker::PhantomData,
             render_argb32_pictformat_cursor,
         })
@@ -326,6 +344,33 @@ impl Application {
         self.screen_num
     }
 
+    #[inline]
+    pub(crate) fn argb_visual_type(&self) -> Option<Visualtype> {
+        // Check if a composite manager is running
+        let atom_name = format!("_NET_WM_CM_S{}", self.screen_num);
+        let owner = self
+            .connection
+            .intern_atom(false, atom_name.as_bytes())
+            .ok()
+            .and_then(|cookie| cookie.reply().ok())
+            .map(|reply| reply.atom)
+            .and_then(|atom| self.connection.get_selection_owner(atom).ok())
+            .and_then(|cookie| cookie.reply().ok())
+            .map(|reply| reply.owner);
+
+        if Some(x11rb::NONE) == owner {
+            tracing::debug!("_NET_WM_CM_Sn selection is unowned, not providing ARGB visual");
+            None
+        } else {
+            self.argb_visual_type
+        }
+    }
+
+    #[inline]
+    pub(crate) fn root_visual_type(&self) -> Visualtype {
+        self.root_visual_type
+    }
+
     /// Returns `Ok(true)` if we want to exit the main loop.
     fn handle_event(&self, ev: &Event) -> Result<bool, Error> {
         match ev {

druid-shell/src/platform/x11/util.rs

@@ -19,8 +19,11 @@ use std::rc::Rc;
 use std::time::Instant;
 
 use anyhow::{anyhow, Error};
+use x11rb::connection::RequestConnection;
+use x11rb::errors::ReplyError;
 use x11rb::protocol::randr::{ConnectionExt, ModeFlag};
-use x11rb::protocol::xproto::{Screen, Visualtype, Window};
+use x11rb::protocol::render::{self, ConnectionExt as _};
+use x11rb::protocol::xproto::{Screen, Visualid, Visualtype, Window};
 use x11rb::xcb_ffi::XCBConnection;
 
 use crate::window::TimerToken;
@@ -69,17 +72,76 @@ pub fn refresh_rate(conn: &Rc<XCBConnection>, window_id: Window) -> Option<f64>
 }
 
 // Apparently you have to get the visualtype this way :|
-pub fn get_visual_from_screen(screen: &Screen) -> Option<Visualtype> {
+fn find_visual_from_screen(screen: &Screen, visual_id: u32) -> Option<Visualtype> {
     for depth in &screen.allowed_depths {
         for visual in &depth.visuals {
-            if visual.visual_id == screen.root_visual {
+            if visual.visual_id == visual_id {
                 return Some(*visual);
             }
         }
     }
     None
 }
 
+pub fn get_visual_from_screen(screen: &Screen) -> Option<Visualtype> {
+    find_visual_from_screen(screen, screen.root_visual)
+}
+
+pub fn get_argb_visual_type(
+    conn: &XCBConnection,
+    screen: &Screen,
+) -> Result<Option<Visualtype>, ReplyError> {
+    fn find_visual_for_format(
+        reply: &render::QueryPictFormatsReply,
+        id: render::Pictformat,
+    ) -> Option<Visualid> {
+        let find_in_depth = |depth: &render::Pictdepth| {
+            depth
+                .visuals
+                .iter()
+                .find(|visual| visual.format == id)
+                .map(|visual| visual.visual)
+        };
+        let find_in_screen =
+            |screen: &render::Pictscreen| screen.depths.iter().find_map(find_in_depth);
+        reply.screens.iter().find_map(find_in_screen)
+    }
+
+    // Getting a visual is already funny, but finding the ARGB32 visual is even more fun.
+    // RENDER has picture formats. Each format corresponds to a visual. Thus, we first find the
+    // right picture format, then find the corresponding visual id, then the Visualtype.
+    if conn
+        .extension_information(render::X11_EXTENSION_NAME)?
+        .is_none()
+    {
+        // RENDER not supported
+        Ok(None)
+    } else {
+        let pict_formats = conn.render_query_pict_formats()?.reply()?;
+        // Find the ARGB32 standard format
+        let res = pict_formats
+            .formats
+            .iter()
+            .find(|format| {
+                format.type_ == render::PictType::DIRECT
+                    && format.depth == 32
+                    && format.direct.red_shift == 16
+                    && format.direct.red_mask == 0xff
+                    && format.direct.green_shift == 8
+                    && format.direct.green_mask == 0xff
+                    && format.direct.blue_shift == 0
+                    && format.direct.blue_mask == 0xff
+                    && format.direct.alpha_shift == 24
+                    && format.direct.alpha_mask == 0xff
+            })
+            // Now find the corresponding visual ID
+            .and_then(|format| find_visual_for_format(&pict_formats, format.id))
+            // And finally, we can find the visual
+            .and_then(|visual_id| find_visual_from_screen(screen, visual_id));
+        Ok(res)
+    }
+}
+
 macro_rules! log_x11 {
     ($val:expr) => {
         if let Err(e) = $val {