hint gaming

src/core/text/mod.rs

@@ -21,18 +21,20 @@ pub struct TextView {
     // cache
     tex: Option<RenderedText>,
     width: Option<f32>,
+    pub hint: Option<WidgetId>,
 }
 
 impl TextView {
-    pub fn new(buf: TextBuffer, attrs: TextAttrs) -> Self {
+    pub fn new(buf: TextBuffer, attrs: TextAttrs, hint: Option<WidgetId>) -> Self {
         Self {
             attrs: attrs.into(),
             buf: buf.into(),
             tex: None,
             width: None,
+            hint,
         }
     }
-    pub fn render(&mut self, ctx: &mut SizeCtx) -> RenderedText {
+    fn render(&mut self, ctx: &mut SizeCtx) -> RenderedText {
         let width = if self.attrs.wrap {
             Some(ctx.px_size().x)
         } else {
@@ -71,6 +73,12 @@ impl TextView {
         let mut region = region.offset(tex.top_left_offset);
         region.x.end = region.x.start + UiScalar::abs(dims.x);
         region.y.end = region.y.start + UiScalar::abs(dims.y);
+        if let Some(hint) = &self.hint
+            && let [line] = &self.buf.lines[..]
+            && line.text().is_empty()
+        {
+            painter.widget(hint);
+        }
         painter.texture_within(&tex.handle, region);
         region
     }
@@ -82,7 +90,7 @@ impl Text {
         let buf = TextBuffer::new_empty(Metrics::new(attrs.font_size, attrs.line_height));
         Self {
             content: content.into().into(),
-            view: TextView::new(buf, attrs),
+            view: TextView::new(buf, attrs, None),
         }
     }
     fn update_buf(&mut self, ctx: &mut SizeCtx) {