Implemented support for dynamic `SELECTION_TOOLBAR_ANCHOR_VAR`.

Changed selection toolbar properties to be intrinsic to the `Text!` widget and descendants.

TODO/_current.md

@@ -10,6 +10,7 @@
         - Needs to open when a selection finishes creating (mouse/touch release)
             - And close with any interaction that closes POPUP + any mouse/touch/keyboard interaction with the Text widget.
                 - Test touch.
+        - If the toolbar is not focusable it does not close when changing focus to another app?
     - Have the selection_toolbar_fn args indicate what kind of event created the selection.
         - This way we can have the default only open for touch events, and users can have different toolbars
           without we needing to declare multiple properties.

zero-ui-wgt-text/src/lib.rs

@@ -108,8 +108,9 @@ pub struct Text(
     LangMix<
     FontFeaturesMix<
     TextEditMix<
+    SelectionToolbarMix<
     WidgetBase
-    >>>>>>>>>>
+    >>>>>>>>>>>
 );
 
 impl Text {
@@ -124,6 +125,7 @@ impl Text {
         TextTransformMix::<()>::context_vars_set(set);
         FontFeaturesMix::<()>::context_vars_set(set);
         TextEditMix::<()>::context_vars_set(set);
+        SelectionToolbarMix::<()>::context_vars_set(set);
 
         LangMix::<()>::context_vars_set(set);
     }

zero-ui-wgt-text/src/node.rs

@@ -3712,7 +3712,7 @@ pub fn selection_toolbar_node(child: impl UiNode) -> impl UiNode {
                     let node = match_widget(node, move |c, op| match op {
                         UiNodeOp::Init => {
                             c.init();
-                            // c.with_context(|| );// SELECTION_TOOLBAR_ANCHOR_VAR subscribe TODO
+                            c.with_context(WidgetUpdateMode::Bubble, || WIDGET.sub_var_layout(&SELECTION_TOOLBAR_ANCHOR_VAR));
                         }
                         UiNodeOp::Layout { wl, final_size } => {
                             let r_txt = ResolvedText::get();
@@ -3773,6 +3773,7 @@ pub fn selection_toolbar_node(child: impl UiNode) -> impl UiNode {
                             let mut allow = ContextValueSet::new();
                             super::LangMix::<()>::context_vars_set(&mut allow);
                             exclude.remove_all(&allow);
+                            exclude.remove(&SELECTION_TOOLBAR_ANCHOR_VAR);
 
                             exclude
                         }),

zero-ui-wgt-text/src/text_properties.rs

@@ -1743,10 +1743,29 @@ pub fn txt_highlight(child: impl UiNode, range: impl IntoVar<std::ops::Range<Car
     })
 }
 
+/// Selection toolbar properties.
+#[widget_mixin]
+pub struct SelectionToolbarMix<P>(P);
+
+context_var! {
+    /// Selection toolbar function.
+    pub static SELECTION_TOOLBAR_FN_VAR: WidgetFn<SelectionToolbarArgs> = WidgetFn::nil();
+    /// Position the selection toolbar in relation to the bounding box of all selection rectangles.
+    pub static SELECTION_TOOLBAR_ANCHOR_VAR: AnchorOffset = AnchorOffset::out_top();
+}
+
+impl SelectionToolbarMix<()> {
+    /// Insert context variables used by properties in this mix-in.
+    pub fn context_vars_set(set: &mut ContextValueSet) {
+        set.insert(&SELECTION_TOOLBAR_FN_VAR);
+        set.insert(&SELECTION_TOOLBAR_ANCHOR_VAR);
+    }
+}
+
 /// Defines the floating mini-toolbar that shows near a new text selection.
 ///
 /// The `toolbar` is used
-#[property(CONTEXT)]
+#[property(CONTEXT, widget_impl(SelectionToolbarMix<P>))]
 pub fn selection_toolbar(child: impl UiNode, toolbar: impl UiNode) -> impl UiNode {
     selection_toolbar_fn(child, WidgetFn::singleton(toolbar))
 }
@@ -1754,7 +1773,7 @@ pub fn selection_toolbar(child: impl UiNode, toolbar: impl UiNode) -> impl UiNod
 /// Defines the floating mini-toolbar that shows near a new text selection.
 ///
 /// Sets the [`SELECTION_TOOLBAR_FN_VAR`].
-#[property(CONTEXT, default(SELECTION_TOOLBAR_FN_VAR))]
+#[property(CONTEXT, default(SELECTION_TOOLBAR_FN_VAR), widget_impl(SelectionToolbarMix<P>))]
 pub fn selection_toolbar_fn(child: impl UiNode, toolbar: impl IntoVar<WidgetFn<SelectionToolbarArgs>>) -> impl UiNode {
     with_context_var(child, SELECTION_TOOLBAR_FN_VAR, toolbar)
 }
@@ -1772,14 +1791,7 @@ pub struct SelectionToolbarArgs {
 /// See [`selection_toolbar_fn`](fn@selection_toolbar_fn).
 ///
 /// Sets the [`SELECTION_TOOLBAR_ANCHOR_VAR`].
-#[property(CONTEXT, default(SELECTION_TOOLBAR_ANCHOR_VAR))]
+#[property(CONTEXT, default(SELECTION_TOOLBAR_ANCHOR_VAR), widget_impl(SelectionToolbarMix<P>))]
 pub fn selection_toolbar_anchor(child: impl UiNode, offset: impl IntoVar<AnchorOffset>) -> impl UiNode {
     with_context_var(child, SELECTION_TOOLBAR_ANCHOR_VAR, offset)
 }
-
-context_var! {
-    /// Selection toolbar function.
-    pub static SELECTION_TOOLBAR_FN_VAR: WidgetFn<SelectionToolbarArgs> = WidgetFn::nil();
-    /// Position the selection toolbar in relation to the bounding box of all selection rectangles.
-    pub static SELECTION_TOOLBAR_ANCHOR_VAR: AnchorOffset = AnchorOffset::out_top();
-}