refactor: extract editor overlay helpers

rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs

@@ -3,4 +3,5 @@ pub(crate) mod attachment_upload;
 pub(crate) mod command_sync;
 pub(crate) mod dom_selection;
 pub(crate) mod history_safe_commands;
+pub(crate) mod overlays;
 pub(crate) mod persistence;

rust/spikes/leptos-tiptap-spike/src/editor_runtime/overlays.rs

@@ -0,0 +1,39 @@
+use leptos::prelude::{Set, WriteSignal};
+
+use crate::{
+    editor_runtime::dom_selection::active_editor_text_selection, editor_stage_element,
+};
+
+#[derive(Clone, Debug, PartialEq)]
+pub(crate) struct FloatingToolbarAnchor {
+    pub(crate) top: f64,
+    pub(crate) left: f64,
+}
+
+pub(crate) fn floating_toolbar_anchor_from_selection() -> Option<FloatingToolbarAnchor> {
+    let selection = active_editor_text_selection()?;
+    let range = selection.get_range_at(0).ok()?;
+    let rect = range.get_bounding_client_rect();
+    if rect.width() <= 0.0 && rect.height() <= 0.0 {
+        return None;
+    }
+
+    let stage = editor_stage_element()?;
+    let stage_rect = stage.get_bounding_client_rect();
+
+    Some(FloatingToolbarAnchor {
+        top: (rect.top() - stage_rect.top()).max(60.0),
+        left: rect.left() + (rect.width() / 2.0) - stage_rect.left(),
+    })
+}
+
+pub(crate) fn sync_text_selection_overlay(
+    set_text_selection_active: WriteSignal<bool>,
+    set_floating_toolbar_anchor: WriteSignal<Option<FloatingToolbarAnchor>>,
+) -> bool {
+    let toolbar_anchor = floating_toolbar_anchor_from_selection();
+    let has_text_selection = toolbar_anchor.is_some();
+    set_text_selection_active.set(has_text_selection);
+    set_floating_toolbar_anchor.set(toolbar_anchor);
+    has_text_selection
+}