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// 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.
//! This example shows how to construct a basic layout.
use druid::widget::{Button, Flex, Label};
use druid::{AppLauncher, Color, LocalizedString, Widget, WidgetExt, WindowDesc};
fn build_app() -> impl Widget<u32> {
// Begin construction of vertical layout
let mut col = Flex::column();
// Construct a horizontal layout.
let mut header = Flex::row();
header.add_child(
Label::new("One")
.fix_width(60.0)
.background(Color::rgb8(0x77, 0x77, 0))
.border(Color::WHITE, 3.0)
.center(),
);
// Spacing element that will fill all available space in between label
// and a button. Notice that weight is non-zero.
header.add_flex_spacer(1.0);
header.add_child(Button::new("Two").padding(20.));
col.add_child(
header
.fix_height(100.0)
.background(Color::rgb8(0, 0x77, 0x88)),
);
for i in 0..5 {
// Give a larger weight to one of the buttons for it to
// occupy more space.
let weight = if i == 2 { 3.0 } else { 1.0 };
// call `expand_height` to force the buttons to use all their provided flex
col.add_flex_child(
Button::new(format!("Button #{}", i)).expand_height(),
weight,
);
}
col.debug_paint_layout()
}
fn main() {
let window = WindowDesc::new(build_app)
.title(LocalizedString::new("layout-demo-window-title").with_placeholder("Very flexible"));
AppLauncher::with_window(window)
.use_simple_logger()
.launch(0u32)
.expect("launch failed");
}