Merge pull request #354 from hecrj/feature/glow-renderer

OpenGL renderer and backend-agnostic graphics subcrate

1 files changed, 72 insertions, 0 deletions

diff --git a/graphics/src/widget/text.rs b/graphics/src/widget/text.rs
new file mode 100644
index 00000000..327f8e29
--- /dev/null
+++ b/graphics/src/widget/text.rs
@@ -0,0 +1,72 @@
+//! Write some text for your users to read.
+use crate::backend::{self, Backend};
+use crate::{Primitive, Renderer};
+use iced_native::mouse;
+use iced_native::text;
+use iced_native::{
+    Color, Font, HorizontalAlignment, Rectangle, Size, VerticalAlignment,
+};
+
+/// A paragraph of text.
+///
+/// This is an alias of an `iced_native` text with an `iced_wgpu::Renderer`.
+pub type Text<Backend> = iced_native::Text<Renderer<Backend>>;
+
+use std::f32;
+
+impl<B> text::Renderer for Renderer<B>
+where
+    B: Backend + backend::Text,
+{
+    type Font = Font;
+
+    const DEFAULT_SIZE: u16 = 20;
+
+    fn measure(
+        &self,
+        content: &str,
+        size: u16,
+        font: Font,
+        bounds: Size,
+    ) -> (f32, f32) {
+        self.backend()
+            .measure(content, f32::from(size), font, bounds)
+    }
+
+    fn draw(
+        &mut self,
+        defaults: &Self::Defaults,
+        bounds: Rectangle,
+        content: &str,
+        size: u16,
+        font: Font,
+        color: Option<Color>,
+        horizontal_alignment: HorizontalAlignment,
+        vertical_alignment: VerticalAlignment,
+    ) -> Self::Output {
+        let x = match horizontal_alignment {
+            iced_native::HorizontalAlignment::Left => bounds.x,
+            iced_native::HorizontalAlignment::Center => bounds.center_x(),
+            iced_native::HorizontalAlignment::Right => bounds.x + bounds.width,
+        };
+
+        let y = match vertical_alignment {
+            iced_native::VerticalAlignment::Top => bounds.y,
+            iced_native::VerticalAlignment::Center => bounds.center_y(),
+            iced_native::VerticalAlignment::Bottom => bounds.y + bounds.height,
+        };
+
+        (
+            Primitive::Text {
+                content: content.to_string(),
+                size: f32::from(size),
+                bounds: Rectangle { x, y, ..bounds },
+                color: color.unwrap_or(defaults.text.color),
+                font,
+                horizontal_alignment,
+                vertical_alignment,
+            },
+            mouse::Interaction::default(),
+        )
+    }
+}