dail2 now works

examples/dial_test2.rs

+// Copyright 2019 The xi-editor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! An example of an animating widget.
+
+use std::f64::consts::PI;
+
+use druid::kurbo::{BezPath, Line};
+use druid::widget::{Flex, Label, WidgetExt};
+use druid::{
+    AppLauncher, BoxConstraints, Color, Data, Env, Event, EventCtx, LayoutCtx, Lens, LensWrap,
+    LinearGradient, PaintCtx, PlatformError, Point, RenderContext, Size, UnitPoint, UpdateCtx,
+    Vec2, WheelEvent, Widget, WindowDesc,
+};
+
+use log::info;
+
+use druid_widgets::*;
+
+#[derive(Clone, Data, Lens)]
+struct DialData {
+    value: f64,
+    value2: f64,
+}
+
+fn build_app() -> impl Widget<(DialData)> {
+    let solid = Color::rgb8(0x3a, 0x3a, 0x3a);
+    let gradient = LinearGradient::new(
+        UnitPoint::TOP_LEFT,
+        UnitPoint::BOTTOM_RIGHT,
+        (Color::rgb8(0x11, 0x11, 0x11), Color::rgb8(0xbb, 0xbb, 0xbb)),
+    );
+
+    Flex::column()
+        .with_child(
+            Flex::row()
+                .with_child(
+                    Label::new("top left")
+                        .background(solid.clone())
+                        .padding(10.0),
+                    1.0,
+                )
+                .with_child(
+                    LensWrap::new(Dial::new(Size::new(100.0, 100.0)), DialData::value)
+                        .background(solid.clone())
+                        .padding(10.0),
+                    0.0,
+                )
+                .with_child(
+                    LensWrap::new(Dial::new(Size::new(200.0, 200.0)), DialData::value2)
+                        .background(solid.clone())
+                        .padding(10.0),
+                    0.0,
+                )
+                .with_child(
+                    Label::new("top right")
+                        .background(solid.clone())
+                        .padding(10.0),
+                    1.0,
+                ),
+            0.0, // vertical
+        )
+        .with_child(
+            Flex::row()
+                .with_child(
+                    Label::new("bottom left")
+                        .background(gradient.clone())
+                        .rounded(10.0)
+                        .padding(10.0),
+                    0.0,
+                )
+                .with_child(
+                    Label::new("bottom right")
+                        .border(solid.clone(), 4.0)
+                        .rounded(10.0)
+                        .padding(10.0),
+                    1.0,
+                ),
+            1.0,
+        )
+}
+
+fn main() -> Result<(), PlatformError> {
+    AppLauncher::with_window(WindowDesc::new(build_app))
+        .use_simple_logger()
+        .launch(DialData {
+            value: 0.0,
+            value2: 1.0,
+        })?;
+
+    Ok(())
+}