core: Add UiBackend::close_virtual_keyboard

This method may be used by backends that require explicit virtual
keyboard closing.

core/src/backend/ui.rs

@@ -91,9 +91,10 @@ pub trait UiBackend: Downcast {
     // Unused, but kept in case we need it later.
     fn message(&self, message: &str);
 
-    // Only used on web.
     fn open_virtual_keyboard(&self);
 
+    fn close_virtual_keyboard(&self);
+
     fn language(&self) -> LanguageIdentifier;
 
     fn display_unsupported_video(&self, url: Url);
@@ -360,6 +361,8 @@ impl UiBackend for NullUiBackend {
 
     fn open_virtual_keyboard(&self) {}
 
+    fn close_virtual_keyboard(&self) {}
+
     fn language(&self) -> LanguageIdentifier {
         US_ENGLISH.clone()
     }

core/src/focus_tracker.rs

@@ -197,12 +197,18 @@ impl<'gc> FocusTracker<'gc> {
         if let Some(text_field) = self.get_as_edit_text() {
             if text_field.is_editable() {
                 if !text_field.movie().is_action_script_3() {
+                    // TODO This logic is inaccurate and addresses
+                    //   only setting the focus programmatically.
                     let length = text_field.text_length();
                     text_field
                         .set_selection(Some(TextSelection::for_range(0, length)), context.gc());
                 }
                 context.ui.open_virtual_keyboard();
+            } else {
+                context.ui.close_virtual_keyboard();
             }
+        } else {
+            context.ui.close_virtual_keyboard();
         }
     }
 

desktop/src/backends/ui.rs

@@ -310,6 +310,8 @@ impl UiBackend for DesktopUiBackend {
     // Unused on desktop
     fn open_virtual_keyboard(&self) {}
 
+    fn close_virtual_keyboard(&self) {}
+
     fn language(&self) -> LanguageIdentifier {
         self.preferences.language().clone()
     }

tests/framework/src/backends/ui.rs

@@ -117,6 +117,8 @@ impl UiBackend for TestUiBackend {
 
     fn open_virtual_keyboard(&self) {}
 
+    fn close_virtual_keyboard(&self) {}
+
     fn language(&self) -> LanguageIdentifier {
         US_ENGLISH.clone()
     }

web/src/ui.rs

@@ -292,6 +292,8 @@ impl UiBackend for WebUiBackend {
         self.js_player.open_virtual_keyboard()
     }
 
+    fn close_virtual_keyboard(&self) {}
+
     fn language(&self) -> LanguageIdentifier {
         self.language.clone()
     }