input: Add insert and replace method to Input. (#721)

Close #719 

https://github.com/user-attachments/assets/aed24aef-c69f-4512-81bb-bb7e4a6de14e

crates/story/src/input_story.rs

@@ -1,7 +1,7 @@
 use gpui::{
-    actions, div, prelude::FluentBuilder as _, px, App, AppContext as _, Context, Entity,
+    actions, div, prelude::FluentBuilder as _, px, App, AppContext as _, ClickEvent, Context,
-    FocusHandle, Focusable, InteractiveElement, IntoElement, KeyBinding, ParentElement as _,
+    Entity, FocusHandle, Focusable, InteractiveElement, IntoElement, KeyBinding,
-    Render, SharedString, Styled, Window,
+    ParentElement as _, Render, SharedString, Styled, Window,
 };
 use regex::Regex;
 
@@ -335,6 +335,28 @@ impl InputStory {
             input.set_masked(self.otp_masked, window, cx)
         });
     }
+
+    fn on_insert_text_to_textarea(
+        &mut self,
+        _: &ClickEvent,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
+        self.textarea.update(cx, |input, cx| {
+            input.insert("Hello 你好", window, cx);
+        });
+    }
+
+    fn on_replace_text_to_textarea(
+        &mut self,
+        _: &ClickEvent,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
+        self.textarea.update(cx, |input, cx| {
+            input.replace("Hello 你好", window, cx);
+        });
+    }
 }
 
 impl FocusableCycle for InputStory {
@@ -388,7 +410,32 @@ impl Render for InputStory {
                             ),
                     )
                     .child(
-                        section("Textarea", cx).child(div().flex_1().child(self.textarea.clone())),
+                        section("Textarea", cx).child(
+                            v_flex()
+                                .gap_2()
+                                .w_full()
+                                .child(self.textarea.clone())
+                                .child(
+                                    h_flex()
+                                        .gap_2()
+                                        .child(
+                                            Button::new("btn-insert-text")
+                                                .xsmall()
+                                                .label("Insert Text")
+                                                .on_click(
+                                                    cx.listener(Self::on_insert_text_to_textarea),
+                                                ),
+                                        )
+                                        .child(
+                                            Button::new("btn-replace-text")
+                                                .xsmall()
+                                                .label("Replace Text")
+                                                .on_click(
+                                                    cx.listener(Self::on_replace_text_to_textarea),
+                                                ),
+                                        ),
+                                ),
+                        ),
                     )
                     .child(
                         section("Input State", cx)

crates/ui/src/input/input.rs

@@ -474,6 +474,35 @@ impl TextInput {
         cx.notify();
     }
 
+    /// Insert text at the current cursor position.
+    ///
+    /// And the cursor will be moved to the end of inserted text.
+    pub fn insert(
+        &mut self,
+        text: impl Into<SharedString>,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
+        let text: SharedString = text.into();
+        let range = self.range_to_utf16(&(self.cursor_offset()..self.cursor_offset()));
+        self.replace_text_in_range(Some(range), &text, window, cx);
+        self.selected_range = self.selected_range.end..self.selected_range.end;
+    }
+
+    /// Replace text at the current cursor position.
+    ///
+    /// And the cursor will be moved to the end of replaced text.
+    pub fn replace(
+        &mut self,
+        text: impl Into<SharedString>,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
+        let text: SharedString = text.into();
+        self.replace_text_in_range(None, &text, window, cx);
+        self.selected_range = self.selected_range.end..self.selected_range.end;
+    }
+
     fn replace_text(
         &mut self,
         text: impl Into<SharedString>,