Set correct text size for text in preedit window

core/src/input_method.rs

@@ -1,5 +1,5 @@
 //! Listen to input method events.
-use crate::Point;
+use crate::{Pixels, Point};
 
 use std::ops::Range;
 
@@ -34,15 +34,20 @@ pub struct Preedit<T = String> {
     pub content: T,
     /// The selected range of the content.
     pub selection: Option<Range<usize>>,
+    /// The text size of the content.
+    pub text_size: Option<Pixels>,
 }
 
 impl<T> Preedit<T> {
     /// Creates a new empty [`Preedit`].
-    pub fn new() -> Self
+    pub fn new(text_size: Option<impl Into<Pixels>>) -> Self
     where
         T: Default,
     {
-        Self::default()
+        Self {
+            text_size: text_size.map(Into::into),
+            ..Default::default()
+        }
     }
 
     /// Turns a [`Preedit`] into its owned version.
@@ -53,6 +58,7 @@ impl<T> Preedit<T> {
         Preedit {
             content: self.content.as_ref().to_owned(),
             selection: self.selection.clone(),
+            text_size: self.text_size,
         }
     }
 }
@@ -63,6 +69,7 @@ impl Preedit {
         Preedit {
             content: &self.content,
             selection: self.selection.clone(),
+            text_size: self.text_size,
         }
     }
 }
@@ -90,13 +97,13 @@ impl InputMethod {
     /// let open = InputMethod::Open {
     ///     position: Point::ORIGIN,
     ///     purpose: Purpose::Normal,
-    ///     preedit: Some(Preedit { content: "1".to_owned(), selection: None }),
+    ///     preedit: Some(Preedit { content: "1".to_owned(), selection: None, text_size: None }),
     /// };
     ///
     /// let open_2 = InputMethod::Open {
     ///     position: Point::ORIGIN,
     ///     purpose: Purpose::Secure,
-    ///     preedit: Some(Preedit { content: "2".to_owned(), selection: None }),
+    ///     preedit: Some(Preedit { content: "2".to_owned(), selection: None, text_size: None }),
     /// };
     ///
     /// let mut ime = InputMethod::Disabled;

widget/src/text_editor.rs

@@ -753,14 +753,18 @@ where
                 }
                 Update::InputMethod(update) => match update {
                     Ime::Toggle(is_open) => {
-                        state.preedit =
+                        state.preedit = is_open.then(|| {
-                            is_open.then(input_method::Preedit::new);
+                            input_method::Preedit::new(self.text_size)
+                        });
 
                         shell.request_redraw();
                     }
                     Ime::Preedit { content, selection } => {
-                        state.preedit =
+                        state.preedit = Some(input_method::Preedit {
-                            Some(input_method::Preedit { content, selection });
+                            content,
+                            selection,
+                            text_size: self.text_size,
+                        });
 
                         shell.request_redraw();
                     }

widget/src/text_input.rs

@@ -1262,7 +1262,7 @@ where
 
                     state.is_ime_open =
                         matches!(event, input_method::Event::Opened)
-                            .then(input_method::Preedit::new);
+                            .then(|| input_method::Preedit::new(self.size));
 
                     shell.request_redraw();
                 }
@@ -1273,6 +1273,7 @@ where
                         state.is_ime_open = Some(input_method::Preedit {
                             content: content.to_owned(),
                             selection: selection.clone(),
+                            text_size: self.size,
                         });
 
                         shell.request_redraw();

winit/src/program/window_manager.rs

@@ -322,7 +322,9 @@ where
             self.content = Renderer::Paragraph::with_spans(Text {
                 content: &spans,
                 bounds: Size::INFINITY,
-                size: renderer.default_size(),
+                size: preedit
+                    .text_size
+                    .unwrap_or_else(|| renderer.default_size()),
                 line_height: text::LineHeight::default(),
                 font: renderer.default_font(),
                 horizontal_alignment: alignment::Horizontal::Left,