Fix candidate window position for the first time

Author: rhysd

core/src/input_method.rs

@@ -11,7 +11,10 @@ pub enum InputMethod<T = String> {
     /// No input method is allowed.
     Disabled,
     /// Input methods are allowed, but not open yet.
-    Allowed,
+    Allowed {
+        /// The position at which the input method dialog should be placed.
+        position: Point,
+    },
     /// Input method is open.
     Open {
         /// The position at which the input method dialog should be placed.
@@ -117,7 +120,7 @@ impl InputMethod {
         match (&self, other) {
             (InputMethod::Open { .. }, _)
             | (
-                InputMethod::Allowed,
+                InputMethod::Allowed { .. },
                 InputMethod::None | InputMethod::Disabled,
             )
             | (InputMethod::Disabled, InputMethod::None) => {}
@@ -142,7 +145,9 @@ impl<T> InputMethod<T> {
         match self {
             Self::None => InputMethod::None,
             Self::Disabled => InputMethod::Disabled,
-            Self::Allowed => InputMethod::Allowed,
+            Self::Allowed { position } => InputMethod::Allowed {
+                position: *position,
+            },
             Self::Open {
                 position,
                 purpose,

widget/src/text_editor.rs

@@ -339,10 +339,6 @@ where
             return InputMethod::Disabled;
         };
 
-        let Some(preedit) = &state.preedit else {
-            return InputMethod::Allowed;
-        };
-
         let bounds = layout.bounds();
         let internal = self.content.0.borrow_mut();
 
@@ -363,6 +359,10 @@ where
         let position =
             cursor + translation + Vector::new(0.0, f32::from(line_height));
 
+        let Some(preedit) = &state.preedit else {
+            return InputMethod::Allowed { position };
+        };
+
         InputMethod::Open {
             position,
             purpose: input_method::Purpose::Normal,

widget/src/text_input.rs

@@ -406,10 +406,6 @@ where
             return InputMethod::Disabled;
         };
 
-        let Some(preedit) = &state.is_ime_open else {
-            return InputMethod::Allowed;
-        };
-
         let secure_value = self.is_secure.then(|| value.secure());
         let value = secure_value.as_ref().unwrap_or(value);
 
@@ -432,9 +428,14 @@ where
 
         let x = (text_bounds.x + cursor_x).floor() - scroll_offset
             + alignment_offset;
+        let position = Point::new(x, text_bounds.y + text_bounds.height);
+
+        let Some(preedit) = &state.is_ime_open else {
+            return InputMethod::Allowed { position };
+        };
 
         InputMethod::Open {
-            position: Point::new(x, text_bounds.y + text_bounds.height),
+            position,
             purpose: if self.is_secure {
                 input_method::Purpose::Secure
             } else {

winit/src/program/window_manager.rs

@@ -210,8 +210,13 @@ where
             InputMethod::Disabled => {
                 self.raw.set_ime_allowed(false);
             }
-            InputMethod::Allowed | InputMethod::Open { .. } => {
+            InputMethod::Allowed { position }
+            | InputMethod::Open { position, .. } => {
                 self.raw.set_ime_allowed(true);
+                self.raw.set_ime_cursor_area(
+                    LogicalPosition::new(position.x, position.y),
+                    LogicalSize::new(10, 10), // TODO?
+                );
             }
         }
 
@@ -221,11 +226,6 @@ where
             preedit,
         } = input_method
         {
-            self.raw.set_ime_cursor_area(
-                LogicalPosition::new(position.x, position.y),
-                LogicalSize::new(10, 10), // TODO?
-            );
-
             self.raw.set_ime_purpose(conversion::ime_purpose(purpose));
 
             if let Some(preedit) = preedit {