From eb45c51a7b8b9a595e318048712362c8d65d77b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?H=C3=A9ctor=20Ram=C3=B3n=20Jim=C3=A9nez?=
 <hector0193@gmail.com>
Date: Mon, 22 Jul 2019 21:01:59 +0200
Subject: [PATCH] Implement `checkbox::Renderer` in `ggez` example

---
 examples/ggez/main.rs              | 30 ++++++++++----
 examples/ggez/renderer.rs          |  2 +
 examples/ggez/renderer/checkbox.rs | 63 ++++++++++++++++++++++++++++++
 examples/ggez/widget.rs            |  1 +
 4 files changed, 88 insertions(+), 8 deletions(-)
 create mode 100644 examples/ggez/renderer/checkbox.rs

diff --git a/examples/ggez/main.rs b/examples/ggez/main.rs
index 7deef072..770f79b1 100644
--- a/examples/ggez/main.rs
+++ b/examples/ggez/main.rs
@@ -2,7 +2,7 @@ mod renderer;
 mod widget;
 
 use renderer::Renderer;
-use widget::{button, Button, Column, Text};
+use widget::{button, Button, Checkbox, Column, Text};
 
 use ggez;
 use ggez::event;
@@ -43,24 +43,33 @@ impl event::EventHandler for Game {
         let screen = graphics::screen_coordinates(context);
 
         let cursor = {
-            let hello = Text::new("Hello, iced!")
-                .horizontal_alignment(iced::text::HorizontalAlignment::Center);
+            let hello = Text::new("Hello, iced!");
 
-            let button = Button::new(&mut self.button, "Press me!").width(200);
+            let checkbox =
+                Checkbox::new(true, "Check me!", Message::CheckboxToggled);
+
+            let button = Button::new(&mut self.button, "Press me!")
+                .width(200)
+                .align_self(iced::Align::End);
+
+            let widgets = Column::new()
+                .max_width(600)
+                .spacing(20)
+                .push(hello)
+                .push(checkbox)
+                .push(button);
 
             let content = Column::new()
                 .width(screen.w as u32)
                 .height(screen.h as u32)
                 .align_items(iced::Align::Center)
                 .justify_content(iced::Justify::Center)
-                .spacing(20)
-                .push(hello)
-                .push(button);
+                .push(widgets);
 
             let renderer =
                 &mut Renderer::new(context, self.spritesheet.clone());
 
-            let ui: Interface<(), Renderer> =
+            let ui: Interface<Message, Renderer> =
                 Interface::compute(content.into(), renderer);
 
             let cursor = ui.draw(renderer, iced::Point::new(0.0, 0.0));
@@ -77,6 +86,11 @@ impl event::EventHandler for Game {
     }
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum Message {
+    CheckboxToggled(bool),
+}
+
 fn into_cursor_type(cursor: iced::MouseCursor) -> mouse::MouseCursor {
     match cursor {
         iced::MouseCursor::OutOfBounds => mouse::MouseCursor::Default,
diff --git a/examples/ggez/renderer.rs b/examples/ggez/renderer.rs
index d21c5ec3..74fc581d 100644
--- a/examples/ggez/renderer.rs
+++ b/examples/ggez/renderer.rs
@@ -1,4 +1,5 @@
 mod button;
+mod checkbox;
 mod text;
 
 use ggez::graphics::{self, spritebatch::SpriteBatch, Color, Image};
@@ -18,6 +19,7 @@ impl Renderer<'_> {
             spritesheet,
         }
     }
+
     pub fn flush(&mut self) {
         graphics::draw(
             self.context,
diff --git a/examples/ggez/renderer/checkbox.rs b/examples/ggez/renderer/checkbox.rs
new file mode 100644
index 00000000..eac90ac2
--- /dev/null
+++ b/examples/ggez/renderer/checkbox.rs
@@ -0,0 +1,63 @@
+use super::Renderer;
+use ggez::graphics::{DrawParam, Rect};
+use iced::{checkbox, MouseCursor};
+
+const SPRITE: Rect = Rect {
+    x: 98.0,
+    y: 0.0,
+    w: 28.0,
+    h: 28.0,
+};
+
+impl checkbox::Renderer for Renderer<'_> {
+    fn draw(
+        &mut self,
+        cursor_position: iced::Point,
+        bounds: iced::Rectangle<f32>,
+        text_bounds: iced::Rectangle<f32>,
+        is_checked: bool,
+    ) -> MouseCursor {
+        let mouse_over = bounds.contains(cursor_position)
+            || text_bounds.contains(cursor_position);
+
+        let width = self.spritesheet.width() as f32;
+        let height = self.spritesheet.height() as f32;
+
+        self.sprites.add(DrawParam {
+            src: Rect {
+                x: (SPRITE.x + (if mouse_over { SPRITE.w } else { 0.0 }))
+                    / width,
+                y: SPRITE.y / height,
+                w: SPRITE.w / width,
+                h: SPRITE.h / height,
+            },
+            dest: ggez::mint::Point2 {
+                x: bounds.x,
+                y: bounds.y,
+            },
+            ..DrawParam::default()
+        });
+
+        if is_checked {
+            self.sprites.add(DrawParam {
+                src: Rect {
+                    x: (SPRITE.x + SPRITE.w * 2.0) / width,
+                    y: SPRITE.y / height,
+                    w: SPRITE.w / width,
+                    h: SPRITE.h / height,
+                },
+                dest: ggez::mint::Point2 {
+                    x: bounds.x,
+                    y: bounds.y,
+                },
+                ..DrawParam::default()
+            });
+        }
+
+        if mouse_over {
+            MouseCursor::Pointer
+        } else {
+            MouseCursor::OutOfBounds
+        }
+    }
+}
diff --git a/examples/ggez/widget.rs b/examples/ggez/widget.rs
index 657a3190..00c013d4 100644
--- a/examples/ggez/widget.rs
+++ b/examples/ggez/widget.rs
@@ -3,3 +3,4 @@ use ggez::graphics::Color;
 pub use iced::{button, Button, Column, Row};
 
 pub type Text = iced::Text<Color>;
+pub type Checkbox<Message> = iced::Checkbox<Color, Message>;