1 files changed, 84 insertions, 0 deletions
diff --git a/components/msg/constellation_msg.rs b/components/msg/constellation_msg.rs
new file mode 100644
index 00000000000..35b07024acd
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+++ b/components/msg/constellation_msg.rs
@@ -0,0 +1,84 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//! The high-level interface from script to constellation. Using this abstract interface helps reduce
+//! coupling between these two components
+
+use geom::rect::Rect;
+use geom::size::TypedSize2D;
+use geom::scale_factor::ScaleFactor;
+use layers::geometry::DevicePixel;
+use serialize::Encodable;
+use servo_util::geometry::{PagePx, ViewportPx};
+use std::comm::{channel, Sender, Receiver};
+use url::Url;
+
+#[deriving(Clone)]
+pub struct ConstellationChan(pub Sender<Msg>);
+
+impl ConstellationChan {
+    pub fn new() -> (Receiver<Msg>, ConstellationChan) {
+        let (chan, port) = channel();
+        (port, ConstellationChan(chan))
+    }
+}
+
+#[deriving(PartialEq)]
+pub enum IFrameSandboxState {
+    IFrameSandboxed,
+    IFrameUnsandboxed
+}
+
+// We pass this info to various tasks, so it lives in a separate, cloneable struct.
+#[deriving(Clone)]
+pub struct Failure {
+    pub pipeline_id: PipelineId,
+    pub subpage_id: Option<SubpageId>,
+}
+
+#[deriving(Encodable)]
+pub struct WindowSizeData {
+    /// The size of the initial layout viewport, before parsing an
+    /// http://www.w3.org/TR/css-device-adapt/#initial-viewport
+    pub initial_viewport: TypedSize2D<ViewportPx, f32>,
+
+    /// The "viewing area" in page px. See `PagePx` documentation for details.
+    pub visible_viewport: TypedSize2D<PagePx, f32>,
+
+    /// The resolution of the window in dppx, not including any "pinch zoom" factor.
+    pub device_pixel_ratio: ScaleFactor<ViewportPx, DevicePixel, f32>,
+}
+
+/// Messages from the compositor and script to the constellation.
+pub enum Msg {
+    ExitMsg,
+    FailureMsg(Failure),
+    InitLoadUrlMsg(Url),
+    LoadCompleteMsg(PipelineId, Url),
+    FrameRectMsg(PipelineId, SubpageId, Rect<f32>),
+    LoadUrlMsg(PipelineId, Url),
+    LoadIframeUrlMsg(Url, PipelineId, SubpageId, IFrameSandboxState),
+    NavigateMsg(NavigationDirection),
+    RendererReadyMsg(PipelineId),
+    ResizedWindowMsg(WindowSizeData),
+}
+
+/// Represents the two different ways to which a page can be navigated
+#[deriving(Clone, PartialEq, Hash)]
+pub enum NavigationType {
+    Load,               // entered or clicked on a url
+    Navigate,           // browser forward/back buttons
+}
+
+#[deriving(Clone, PartialEq, Hash)]
+pub enum NavigationDirection {
+    Forward,
+    Back,
+}
+
+#[deriving(Clone, PartialEq, Eq, Hash, Encodable)]
+pub struct PipelineId(pub uint);
+
+#[deriving(Clone, PartialEq, Eq, Hash, Encodable)]
+pub struct SubpageId(pub uint);