feat: add validate_input widget

src/widget/text_input/input.rs

@@ -160,6 +160,20 @@ where
         .padding([spacing, spacing, spacing, spacing])
 }
 
+/// Creates a new validate input [`TextInput`].
+///
+/// [`TextInput`]: widget::TextInput
+pub fn validate_input<'a, Message>(
+    placeholder: impl Into<Cow<'a, str>>,
+    value: impl Into<Cow<'a, str>>,
+    validate_condition: bool,
+) -> TextInput<'a, Message>
+where
+    Message: Clone + 'static,
+{
+    TextInput::new(placeholder, value).validation_condition(validate_condition)
+}
+
 #[cfg(feature = "wayland")]
 pub(crate) const SUPPORTED_TEXT_MIME_TYPES: &[&str; 6] = &[
     "text/plain;charset=utf-8",
@@ -185,6 +199,7 @@ pub struct TextInput<'a, Message> {
     is_secure: bool,
     is_editable: bool,
     is_read_only: bool,
+    is_validated: Option<bool>,
     font: Option<<crate::Renderer as iced_core::text::Renderer>::Font>,
     width: Length,
     padding: Padding,
@@ -228,6 +243,7 @@ where
             is_secure: false,
             is_editable: false,
             is_read_only: false,
+            is_validated: None,
             font: None,
             width: Length::Fill,
             padding: [spacing, spacing, spacing, spacing].into(),
@@ -298,6 +314,11 @@ where
         self
     }
 
+    fn validation_condition(mut self, validation_condition: bool) -> Self {
+        self.is_validated = Some(validation_condition);
+        self
+    }
+
     /// Sets the message that should be produced when some text is typed into
     /// the [`TextInput`].
     ///
@@ -415,6 +436,7 @@ where
             self.font,
             self.on_input.is_none(),
             self.is_secure,
+            self.is_validated,
             self.leading_icon.as_ref(),
             self.trailing_icon.as_ref(),
             &self.style,
@@ -804,6 +826,7 @@ where
             self.font,
             self.on_input.is_none(),
             self.is_secure,
+            self.is_validated,
             self.leading_icon.as_ref(),
             self.trailing_icon.as_ref(),
             &self.style,
@@ -1959,6 +1982,7 @@ pub fn draw<'a, Message>(
     font: Option<<crate::Renderer as iced_core::text::Renderer>::Font>,
     is_disabled: bool,
     is_secure: bool,
+    is_validated: Option<bool>,
     icon: Option<&Element<'a, Message, crate::Theme, crate::Renderer>>,
     trailing_icon: Option<&Element<'a, Message, crate::Theme, crate::Renderer>>,
     style: &<crate::Theme as StyleSheet>::Style,
@@ -2020,6 +2044,7 @@ pub fn draw<'a, Message>(
 
     let mut icon_color = appearance.icon_color.unwrap_or(renderer_style.icon_color);
     let mut text_color = appearance.text_color.unwrap_or(renderer_style.text_color);
+    let mut border_color = appearance.border_color;
 
     // TODO: iced will not render alpha itself on text or icon colors.
     if is_disabled {
@@ -2028,6 +2053,16 @@ pub fn draw<'a, Message>(
         text_color = text_color.blend_alpha(background, 0.5);
     }
 
+    if is_validated.is_some() {
+        if !is_validated.unwrap() {
+            border_color = Color::from_rgb(
+                0.95,
+                0.30,
+                0.30
+            );
+        }
+    }
+
     // draw background and its border
     if let Some(border_offset) = appearance.border_offset {
         let offset_bounds = Rectangle {
@@ -2056,7 +2091,7 @@ pub fn draw<'a, Message>(
                 bounds: offset_bounds,
                 border: Border {
                     width: appearance.border_width,
-                    color: appearance.border_color,
+                    color: border_color,
                     radius: appearance.border_radius,
                 },
                 shadow: Shadow {