Wayland: add set_wayland_theme() to control client decoration color… (#775)

* Wayland: add `set_wayland_theme()` to control client decoration color theme

* Change &mut self to &self

* Remove endianness comment

CHANGELOG.md

@@ -1,5 +1,6 @@
 # Unreleased
 
+- On Wayland, add `set_wayland_theme()` to control client decoration color theme
 - Added serde serialization to `os::unix::XWindowType`.
 - **Breaking:** `image` crate upgraded to 0.21. This is exposed as part of the `icon_loading` API.
 

src/os/unix.rs

@@ -4,6 +4,8 @@ use std::os::raw;
 use std::ptr;
 use std::sync::Arc;
 
+use sctk::window::{ButtonState, Theme};
+
 use {
     EventsLoop,
     LogicalSize,
@@ -25,6 +27,74 @@ pub use platform::x11;
 pub use platform::XNotSupported;
 pub use platform::x11::util::WindowType as XWindowType;
 
+/// Theme for wayland client side decorations
+///
+/// Colors must be in ARGB8888 format
+pub struct WaylandTheme {
+    /// Primary color when the window is focused
+    pub primary_active: [u8; 4],
+    /// Primary color when the window is unfocused
+    pub primary_inactive: [u8; 4],
+    /// Secondary color when the window is focused
+    pub secondary_active: [u8; 4],
+    /// Secondary color when the window is unfocused
+    pub secondary_inactive: [u8; 4],
+    /// Close button color when hovered over
+    pub close_button_hovered: [u8; 4],
+    /// Close button color
+    pub close_button: [u8; 4],
+    /// Close button color when hovered over
+    pub maximize_button_hovered: [u8; 4],
+    /// Maximize button color
+    pub maximize_button: [u8; 4],
+    /// Minimize button color when hovered over
+    pub minimize_button_hovered: [u8; 4],
+    /// Minimize button color
+    pub minimize_button: [u8; 4],
+}
+
+struct WaylandThemeObject(WaylandTheme);
+
+impl Theme for WaylandThemeObject {
+    fn get_primary_color(&self, active: bool) -> [u8; 4] {
+        if active {
+            self.0.primary_active
+        } else {
+            self.0.primary_inactive
+        }
+    }
+
+    // Used for division line
+    fn get_secondary_color(&self, active: bool) -> [u8; 4] {
+        if active {
+            self.0.secondary_active
+        } else {
+            self.0.secondary_inactive
+        }
+    }
+
+    fn get_close_button_color(&self, state: ButtonState) -> [u8; 4] {
+        match state {
+            ButtonState::Hovered => self.0.close_button_hovered,
+            _ => self.0.close_button,
+        }
+    }
+
+    fn get_maximize_button_color(&self, state: ButtonState) -> [u8; 4] {
+        match state {
+            ButtonState::Hovered => self.0.maximize_button_hovered,
+            _ => self.0.maximize_button,
+        }
+    }
+
+    fn get_minimize_button_color(&self, state: ButtonState) -> [u8; 4] {
+        match state {
+            ButtonState::Hovered => self.0.minimize_button_hovered,
+            _ => self.0.minimize_button,
+        }
+    }
+}
+
 /// Additional methods on `EventsLoop` that are specific to Linux.
 pub trait EventsLoopExt {
     /// Builds a new `EventsLoop` that is forced to use X11.
@@ -127,6 +197,9 @@ pub trait WindowExt {
     /// The pointer will become invalid when the glutin `Window` is destroyed.
     fn get_wayland_display(&self) -> Option<*mut raw::c_void>;
 
+    /// Sets the color theme of the client side window decorations on wayland
+    fn set_wayland_theme(&self, theme: WaylandTheme);
+
     /// Check if the window is ready for drawing
     ///
     /// It is a remnant of a previous implementation detail for the
@@ -202,6 +275,14 @@ impl WindowExt for Window {
         }
     }
 
+    #[inline]
+    fn set_wayland_theme(&self, theme: WaylandTheme) {
+        match self.window {
+            LinuxWindow::Wayland(ref w) => w.set_theme(WaylandThemeObject(theme)),
+            _ => {}
+        }
+    }
+
     #[inline]
     fn is_ready(&self) -> bool {
         true

src/platform/linux/wayland/window.rs

@@ -7,7 +7,7 @@ use platform::{MonitorId as PlatformMonitorId, PlatformSpecificWindowBuilderAttr
 use window::MonitorId as RootMonitorId;
 
 use sctk::surface::{get_dpi_factor, get_outputs};
-use sctk::window::{ConceptFrame, Event as WEvent, Window as SWindow};
+use sctk::window::{ConceptFrame, Event as WEvent, Window as SWindow, Theme};
 use sctk::reexports::client::{Display, Proxy};
 use sctk::reexports::client::protocol::{wl_seat, wl_surface};
 use sctk::reexports::client::protocol::wl_surface::RequestsTrait as SurfaceRequests;
@@ -235,6 +235,11 @@ impl Window {
         }
     }
 
+
+    pub fn set_theme<T: Theme>(&self, theme: T) {
+        self.frame.lock().unwrap().set_theme(theme)
+    }
+
     #[inline]
     pub fn set_cursor(&self, _cursor: MouseCursor) {
         // TODO