Merge pull request #444 from hecrj/feature/overlay

Overlay support and `PickList` widget

1 files changed, 97 insertions, 0 deletions

diff --git a/graphics/src/widget/pick_list.rs b/graphics/src/widget/pick_list.rs
new file mode 100644
index 00000000..f42a8707
--- /dev/null
+++ b/graphics/src/widget/pick_list.rs
@@ -0,0 +1,97 @@
+//! Display a dropdown list of selectable values.
+use crate::backend::{self, Backend};
+use crate::{Primitive, Renderer};
+use iced_native::{
+    mouse, Font, HorizontalAlignment, Point, Rectangle, VerticalAlignment,
+};
+use iced_style::menu;
+
+pub use iced_native::pick_list::State;
+pub use iced_style::pick_list::{Style, StyleSheet};
+
+/// A widget allowing the selection of a single value from a list of options.
+pub type PickList<'a, T, Message, Backend> =
+    iced_native::PickList<'a, T, Message, Renderer<Backend>>;
+
+impl<B> iced_native::pick_list::Renderer for Renderer<B>
+where
+    B: Backend + backend::Text,
+{
+    type Style = Box<dyn StyleSheet>;
+
+    const DEFAULT_PADDING: u16 = 5;
+
+    fn menu_style(style: &Box<dyn StyleSheet>) -> menu::Style {
+        style.menu()
+    }
+
+    fn draw(
+        &mut self,
+        bounds: Rectangle,
+        cursor_position: Point,
+        selected: Option<String>,
+        padding: u16,
+        text_size: u16,
+        font: Font,
+        style: &Box<dyn StyleSheet>,
+    ) -> Self::Output {
+        let is_mouse_over = bounds.contains(cursor_position);
+
+        let style = if is_mouse_over {
+            style.hovered()
+        } else {
+            style.active()
+        };
+
+        let background = Primitive::Quad {
+            bounds,
+            background: style.background,
+            border_color: style.border_color,
+            border_width: style.border_width,
+            border_radius: style.border_radius,
+        };
+
+        let arrow_down = Primitive::Text {
+            content: B::ARROW_DOWN_ICON.to_string(),
+            font: B::ICON_FONT,
+            size: bounds.height * style.icon_size,
+            bounds: Rectangle {
+                x: bounds.x + bounds.width - f32::from(padding) * 2.0,
+                y: bounds.center_y(),
+                ..bounds
+            },
+            color: style.text_color,
+            horizontal_alignment: HorizontalAlignment::Right,
+            vertical_alignment: VerticalAlignment::Center,
+        };
+
+        (
+            Primitive::Group {
+                primitives: if let Some(label) = selected {
+                    let label = Primitive::Text {
+                        content: label,
+                        size: f32::from(text_size),
+                        font,
+                        color: style.text_color,
+                        bounds: Rectangle {
+                            x: bounds.x + f32::from(padding),
+                            y: bounds.center_y(),
+                            ..bounds
+                        },
+                        horizontal_alignment: HorizontalAlignment::Left,
+                        vertical_alignment: VerticalAlignment::Center,
+                    };
+
+                    vec![background, label, arrow_down]
+                } else {
+                    vec![background, arrow_down]
+                },
+            },
+            if is_mouse_over {
+                mouse::Interaction::Pointer
+            } else {
+                mouse::Interaction::default()
+            },
+        )
+    }
+}