Move widgets from core to native and web

Also made fields private and improved `Renderer` traits.

native/src/widget/text.rs

@@ -1,9 +1,113 @@
 //! Write some text for your users to read.
-use crate::{layout, Element, Hasher, Layout, Length, Point, Widget};
+use crate::{
+    layout, Color, Element, Font, Hasher, HorizontalAlignment, Layout, Length,
+    Point, Rectangle, Size, VerticalAlignment, Widget,
+};
 
 use std::hash::Hash;
 
-pub use iced_core::text::*;
+/// A paragraph of text.
+///
+/// # Example
+///
+/// ```
+/// # use iced_native::Text;
+///
+/// Text::new("I <3 iced!")
+///     .size(40);
+/// ```
+#[derive(Debug, Clone)]
+pub struct Text {
+    content: String,
+    size: Option<u16>,
+    color: Option<Color>,
+    font: Font,
+    width: Length,
+    height: Length,
+    horizontal_alignment: HorizontalAlignment,
+    vertical_alignment: VerticalAlignment,
+}
+
+impl Text {
+    /// Create a new fragment of [`Text`] with the given contents.
+    ///
+    /// [`Text`]: struct.Text.html
+    pub fn new(label: &str) -> Self {
+        Text {
+            content: String::from(label),
+            size: None,
+            color: None,
+            font: Font::Default,
+            width: Length::Fill,
+            height: Length::Shrink,
+            horizontal_alignment: HorizontalAlignment::Left,
+            vertical_alignment: VerticalAlignment::Top,
+        }
+    }
+
+    /// Sets the size of the [`Text`].
+    ///
+    /// [`Text`]: struct.Text.html
+    pub fn size(mut self, size: u16) -> Self {
+        self.size = Some(size);
+        self
+    }
+
+    /// Sets the [`Color`] of the [`Text`].
+    ///
+    /// [`Text`]: struct.Text.html
+    /// [`Color`]: ../../struct.Color.html
+    pub fn color<C: Into<Color>>(mut self, color: C) -> Self {
+        self.color = Some(color.into());
+        self
+    }
+
+    /// Sets the [`Font`] of the [`Text`].
+    ///
+    /// [`Text`]: struct.Text.html
+    /// [`Font`]: ../../struct.Font.html
+    pub fn font(mut self, font: Font) -> Self {
+        self.font = font;
+        self
+    }
+
+    /// Sets the width of the [`Text`] boundaries.
+    ///
+    /// [`Text`]: struct.Text.html
+    pub fn width(mut self, width: Length) -> Self {
+        self.width = width;
+        self
+    }
+
+    /// Sets the height of the [`Text`] boundaries.
+    ///
+    /// [`Text`]: struct.Text.html
+    pub fn height(mut self, height: Length) -> Self {
+        self.height = height;
+        self
+    }
+
+    /// Sets the [`HorizontalAlignment`] of the [`Text`].
+    ///
+    /// [`Text`]: struct.Text.html
+    /// [`HorizontalAlignment`]: enum.HorizontalAlignment.html
+    pub fn horizontal_alignment(
+        mut self,
+        alignment: HorizontalAlignment,
+    ) -> Self {
+        self.horizontal_alignment = alignment;
+        self
+    }
+
+    /// Sets the [`VerticalAlignment`] of the [`Text`].
+    ///
+    /// [`Text`]: struct.Text.html
+    /// [`VerticalAlignment`]: enum.VerticalAlignment.html
+    pub fn vertical_alignment(mut self, alignment: VerticalAlignment) -> Self {
+        self.vertical_alignment = alignment;
+        self
+    }
+}
 
 impl<Message, Renderer> Widget<Message, Renderer> for Text
 where
@@ -18,7 +122,18 @@ where
         renderer: &Renderer,
         limits: &layout::Limits,
     ) -> layout::Node {
-        renderer.layout(&self, limits)
+        let limits = limits.width(self.width).height(self.height);
+
+        let size = self.size.unwrap_or(renderer.default_size());
+
+        let bounds = limits.max();
+
+        let (width, height) =
+            renderer.measure(&self.content, size, self.font, bounds);
+
+        let size = limits.resolve(Size::new(width, height));
+
+        layout::Node::new(size)
     }
 
     fn draw(
@@ -27,7 +142,15 @@ where
         layout: Layout<'_>,
         _cursor_position: Point,
     ) -> Renderer::Output {
-        renderer.draw(&self, layout)
+        renderer.draw(
+            layout.bounds(),
+            &self.content,
+            self.size.unwrap_or(renderer.default_size()),
+            self.font,
+            self.color,
+            self.horizontal_alignment,
+            self.vertical_alignment,
+        )
     }
 
     fn hash_layout(&self, state: &mut Hasher) {
@@ -47,17 +170,15 @@ where
 /// [renderer]: ../../renderer/index.html
 /// [`UserInterface`]: ../../struct.UserInterface.html
 pub trait Renderer: crate::Renderer {
-    /// Creates a [`Node`] with the given [`Style`] for the provided [`Text`]
-    /// contents and size.
-    ///
-    /// You should probably use [`Node::with_measure`] to allow [`Text`] to
-    /// adapt to the dimensions of its container.
-    ///
-    /// [`Node`]: ../../struct.Node.html
-    /// [`Style`]: ../../struct.Style.html
-    /// [`Text`]: struct.Text.html
-    /// [`Node::with_measure`]: ../../struct.Node.html#method.with_measure
-    fn layout(&self, text: &Text, limits: &layout::Limits) -> layout::Node;
+    fn default_size(&self) -> u16;
+
+    fn measure(
+        &self,
+        content: &str,
+        size: u16,
+        font: Font,
+        bounds: Size,
+    ) -> (f32, f32);
 
     /// Draws a [`Text`] fragment.
     ///
@@ -72,7 +193,16 @@ pub trait Renderer: crate::Renderer {
     /// [`Text`]: struct.Text.html
     /// [`HorizontalAlignment`]: enum.HorizontalAlignment.html
     /// [`VerticalAlignment`]: enum.VerticalAlignment.html
-    fn draw(&mut self, text: &Text, layout: Layout<'_>) -> Self::Output;
+    fn draw(
+        &mut self,
+        bounds: Rectangle,
+        content: &str,
+        size: u16,
+        font: Font,
+        color: Option<Color>,
+        horizontal_alignment: HorizontalAlignment,
+        vertical_alignment: VerticalAlignment,
+    ) -> Self::Output;
 }
 
 impl<'a, Message, Renderer> From<Text> for Element<'a, Message, Renderer>