1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134

// Copyright 2019 The Druid 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 a timer.

// On Windows platform, don't show a console when opening the app.
#![windows_subsystem = "windows"]

use std::time::Duration;

use druid::widget::prelude::*;
use druid::widget::BackgroundBrush;
use druid::{AppLauncher, Color, LocalizedString, Point, TimerToken, WidgetPod, WindowDesc};

static TIMER_INTERVAL: Duration = Duration::from_millis(10);

struct TimerWidget {
    timer_id: TimerToken,
    simple_box: WidgetPod<u32, SimpleBox>,
    pos: Point,
}

impl TimerWidget {
    /// Move the box towards the right, until it reaches the edge,
    /// then reset it to the left but move it to another row.
    fn adjust_box_pos(&mut self, container_size: Size) {
        let box_size = self.simple_box.layout_rect().size();
        self.pos.x += 2.;
        if self.pos.x + box_size.width > container_size.width {
            self.pos.x = 0.;
            self.pos.y += box_size.height;
            if self.pos.y + box_size.height > container_size.height {
                self.pos.y = 0.;
            }
        }
    }
}

impl Widget<u32> for TimerWidget {
    fn event(&mut self, ctx: &mut EventCtx, event: &Event, data: &mut u32, env: &Env) {
        match event {
            Event::WindowConnected => {
                // Start the timer when the application launches
                self.timer_id = ctx.request_timer(TIMER_INTERVAL);
            }
            Event::Timer(id) => {
                if *id == self.timer_id {
                    self.adjust_box_pos(ctx.size());
                    ctx.request_layout();
                    self.timer_id = ctx.request_timer(TIMER_INTERVAL);
                }
            }
            _ => (),
        }
        self.simple_box.event(ctx, event, data, env);
    }

    fn lifecycle(&mut self, ctx: &mut LifeCycleCtx, event: &LifeCycle, data: &u32, env: &Env) {
        self.simple_box.lifecycle(ctx, event, data, env);
    }

    fn update(&mut self, ctx: &mut UpdateCtx, _old_data: &u32, data: &u32, env: &Env) {
        self.simple_box.update(ctx, data, env);
    }

    fn layout(&mut self, ctx: &mut LayoutCtx, bc: &BoxConstraints, data: &u32, env: &Env) -> Size {
        self.simple_box.layout(ctx, &bc.loosen(), data, env);
        self.simple_box.set_origin(ctx, data, env, self.pos);
        bc.constrain((500.0, 500.0))
    }

    fn paint(&mut self, ctx: &mut PaintCtx, data: &u32, env: &Env) {
        self.simple_box.paint(ctx, data, env);
    }
}

struct SimpleBox;

impl Widget<u32> for SimpleBox {
    fn event(&mut self, _ctx: &mut EventCtx, _event: &Event, _data: &mut u32, _env: &Env) {}

    fn lifecycle(&mut self, ctx: &mut LifeCycleCtx, event: &LifeCycle, _data: &u32, _env: &Env) {
        if let LifeCycle::HotChanged(_) = event {
            ctx.request_paint();
        }
    }

    fn update(&mut self, _ctx: &mut UpdateCtx, _old_data: &u32, _data: &u32, _env: &Env) {}

    fn layout(
        &mut self,
        _ctx: &mut LayoutCtx,
        bc: &BoxConstraints,
        _data: &u32,
        _env: &Env,
    ) -> Size {
        bc.constrain((50.0, 50.0))
    }

    fn paint(&mut self, ctx: &mut PaintCtx, data: &u32, env: &Env) {
        let mut background = if ctx.is_hot() {
            BackgroundBrush::Color(Color::rgb8(200, 55, 55))
        } else {
            BackgroundBrush::Color(Color::rgb8(30, 210, 170))
        };
        background.paint(ctx, data, env);
    }
}

pub fn main() {
    let window = WindowDesc::new(TimerWidget {
        timer_id: TimerToken::INVALID,
        simple_box: WidgetPod::new(SimpleBox),
        pos: Point::ZERO,
    })
    .with_min_size((200., 200.))
    .title(LocalizedString::new("timer-demo-window-title").with_placeholder("Look at it go!"));

    AppLauncher::with_window(window)
        .log_to_console()
        .launch(0u32)
        .expect("launch failed");
}