Implement the :focus pseudo-class selector

Fixes #5460. This supports for simple focusable elements that are their own
DOM anchors, like text `input` fields.

1 files changed, 20 insertions, 0 deletions

diff --git a/components/script/dom/node.rs b/components/script/dom/node.rs
index a302308d33a..f9b81cad136 100644
--- a/components/script/dom/node.rs
+++ b/components/script/dom/node.rs
@@ -152,6 +152,8 @@ bitflags! {
         #[doc = "Specifies whether or not there is an authentic click in progress on \
                  this element."]
         const CLICK_IN_PROGRESS = 0x100,
+        #[doc = "Specifies whether this node has the focus."]
+        const IN_FOCUS_STATE = 0x200,
     }
 }
 
@@ -440,6 +442,9 @@ pub trait NodeHelpers<'a> {
     fn get_hover_state(self) -> bool;
     fn set_hover_state(self, state: bool);
 
+    fn get_focus_state(self) -> bool;
+    fn set_focus_state(self, state: bool);
+
     fn get_disabled_state(self) -> bool;
     fn set_disabled_state(self, state: bool);
 
@@ -618,6 +623,14 @@ impl<'a> NodeHelpers<'a> for JSRef<'a, Node> {
         self.set_flag(IN_HOVER_STATE, state)
     }
 
+    fn get_focus_state(self) -> bool {
+        self.get_flag(IN_FOCUS_STATE)
+    }
+
+    fn set_focus_state(self, state: bool) {
+        self.set_flag(IN_FOCUS_STATE, state)
+    }
+
     fn get_disabled_state(self) -> bool {
         self.get_flag(IN_DISABLED_STATE)
     }
@@ -1036,6 +1049,8 @@ pub trait RawLayoutNodeHelpers {
     #[allow(unsafe_code)]
     unsafe fn get_hover_state_for_layout(&self) -> bool;
     #[allow(unsafe_code)]
+    unsafe fn get_focus_state_for_layout(&self) -> bool;
+    #[allow(unsafe_code)]
     unsafe fn get_disabled_state_for_layout(&self) -> bool;
     #[allow(unsafe_code)]
     unsafe fn get_enabled_state_for_layout(&self) -> bool;
@@ -1050,6 +1065,11 @@ impl RawLayoutNodeHelpers for Node {
     }
     #[inline]
     #[allow(unsafe_code)]
+    unsafe fn get_focus_state_for_layout(&self) -> bool {
+        self.flags.get().contains(IN_FOCUS_STATE)
+    }
+    #[inline]
+    #[allow(unsafe_code)]
     unsafe fn get_disabled_state_for_layout(&self) -> bool {
         self.flags.get().contains(IN_DISABLED_STATE)
     }