core: Implement forced button mode flag for AVM2.

core/src/avm2/globals/flash/display/sprite.rs

@@ -113,6 +113,44 @@ pub fn set_sound_transform<'gc>(
     Ok(Value::Undefined)
 }
 
+/// Implements `buttonMode`'s getter
+pub fn button_mode<'gc>(
+    _activation: &mut Activation<'_, 'gc, '_>,
+    this: Option<Object<'gc>>,
+    _args: &[Value<'gc>],
+) -> Result<Value<'gc>, Error> {
+    if let Some(mc) = this
+        .and_then(|o| o.as_display_object())
+        .and_then(|o| o.as_movie_clip())
+    {
+        return Ok(mc.forced_button_mode().into());
+    }
+
+    Ok(Value::Undefined)
+}
+
+/// Implements `buttonMode`'s setter
+pub fn set_button_mode<'gc>(
+    activation: &mut Activation<'_, 'gc, '_>,
+    this: Option<Object<'gc>>,
+    args: &[Value<'gc>],
+) -> Result<Value<'gc>, Error> {
+    if let Some(mc) = this
+        .and_then(|o| o.as_display_object())
+        .and_then(|o| o.as_movie_clip())
+    {
+        let forced_button_mode = args
+            .get(0)
+            .cloned()
+            .unwrap_or(Value::Undefined)
+            .coerce_to_boolean();
+
+        mc.set_forced_button_mode(&mut activation.context, forced_button_mode);
+    }
+
+    Ok(Value::Undefined)
+}
+
 /// Construct `Sprite`'s class.
 pub fn create_class<'gc>(mc: MutationContext<'gc, '_>) -> GcCell<'gc, Class<'gc>> {
     let class = Class::new(
@@ -144,6 +182,7 @@ pub fn create_class<'gc>(mc: MutationContext<'gc, '_>) -> GcCell<'gc, Class<'gc>
             Some(sound_transform),
             Some(set_sound_transform),
         ),
+        ("buttonMode", Some(button_mode), Some(set_button_mode)),
     ];
     write.define_public_builtin_instance_properties(mc, PUBLIC_INSTANCE_PROPERTIES);
 

core/src/display_object/movie_clip.rs

@@ -87,7 +87,13 @@ pub struct MovieClipData<'gc> {
     is_focusable: bool,
     has_focus: bool,
     enabled: bool,
+
+    /// Show a hand cursor when the clip is in button mode.
     use_hand_cursor: bool,
+
+    /// Force enable button mode, which causes all mouse-related events to
+    /// trigger on this clip rather than any input-eligible children.
+    button_mode: bool,
     last_queued_script_frame: Option<FrameNumber>,
     queued_script_frame: Option<FrameNumber>,
     queued_goto_frame: Option<FrameNumber>,
@@ -116,6 +122,7 @@ impl<'gc> MovieClip<'gc> {
                 has_focus: false,
                 enabled: true,
                 use_hand_cursor: true,
+                button_mode: false,
                 last_queued_script_frame: None,
                 queued_script_frame: None,
                 queued_goto_frame: None,
@@ -150,6 +157,7 @@ impl<'gc> MovieClip<'gc> {
                 has_focus: false,
                 enabled: true,
                 use_hand_cursor: true,
+                button_mode: false,
                 last_queued_script_frame: None,
                 queued_script_frame: None,
                 queued_goto_frame: None,
@@ -187,6 +195,7 @@ impl<'gc> MovieClip<'gc> {
                 has_focus: false,
                 enabled: true,
                 use_hand_cursor: true,
+                button_mode: false,
                 last_queued_script_frame: None,
                 queued_script_frame: None,
                 queued_goto_frame: None,
@@ -221,6 +230,7 @@ impl<'gc> MovieClip<'gc> {
                 has_focus: false,
                 enabled: true,
                 use_hand_cursor: true,
+                button_mode: false,
                 last_queued_script_frame: None,
                 queued_script_frame: None,
                 queued_goto_frame: None,
@@ -1675,8 +1685,21 @@ impl<'gc> MovieClip<'gc> {
         self.0.read().tag_stream_len()
     }
 
+    pub fn forced_button_mode(self) -> bool {
+        self.0.read().button_mode
+    }
+
+    pub fn set_forced_button_mode(
+        self,
+        context: &mut UpdateContext<'_, 'gc, '_>,
+        button_mode: bool,
+    ) {
+        self.0.write(context.gc_context).button_mode = button_mode;
+    }
+
     pub fn is_button_mode(&self, context: &mut UpdateContext<'_, 'gc, '_>) -> bool {
-        if self
+        if self.forced_button_mode()
+            || self
                 .0
                 .read()
                 .clip_event_flags