open_save/
open_save.rs

1// Copyright 2020 The Druid Authors.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15//! Usage of file open and saving.
16
17// On Windows platform, don't show a console when opening the app.
18#![windows_subsystem = "windows"]
19
20use druid::widget::{Align, Button, Flex, TextBox};
21use druid::{
22    commands, AppDelegate, AppLauncher, Command, DelegateCtx, Env, FileDialogOptions, FileSpec,
23    Handled, LocalizedString, Target, Widget, WindowDesc,
24};
25
26struct Delegate;
27
28pub fn main() {
29    let main_window = WindowDesc::new(ui_builder())
30        .title(LocalizedString::new("open-save-demo").with_placeholder("Opening/Saving Demo"));
31    let data = "Type here.".to_owned();
32    AppLauncher::with_window(main_window)
33        .delegate(Delegate)
34        .log_to_console()
35        .launch(data)
36        .expect("launch failed");
37}
38
39fn ui_builder() -> impl Widget<String> {
40    let rs = FileSpec::new("Rust source", &["rs"]);
41    let txt = FileSpec::new("Text file", &["txt"]);
42    let other = FileSpec::new("Bogus file", &["foo", "bar", "baz"]);
43    // The options can also be generated at runtime,
44    // so to show that off we create a String for the default save name.
45    let default_save_name = String::from("MyFile.txt");
46    let save_dialog_options = FileDialogOptions::new()
47        .allowed_types(vec![rs, txt, other])
48        .default_type(txt)
49        .default_name(default_save_name)
50        .name_label("Target")
51        .title("Choose a target for this lovely file")
52        .button_text("Export");
53    let open_dialog_options = save_dialog_options
54        .clone()
55        .default_name("MySavedFile.txt")
56        .name_label("Source")
57        .title("Where did you put that file?")
58        .button_text("Import");
59
60    let input = TextBox::new();
61    let save = Button::new("Save").on_click(move |ctx, _, _| {
62        ctx.submit_command(druid::commands::SHOW_SAVE_PANEL.with(save_dialog_options.clone()))
63    });
64    let open = Button::new("Open").on_click(move |ctx, _, _| {
65        ctx.submit_command(druid::commands::SHOW_OPEN_PANEL.with(open_dialog_options.clone()))
66    });
67
68    let mut col = Flex::column();
69    col.add_child(input);
70    col.add_spacer(8.0);
71    col.add_child(save);
72    col.add_child(open);
73    Align::centered(col)
74}
75
76impl AppDelegate<String> for Delegate {
77    fn command(
78        &mut self,
79        _ctx: &mut DelegateCtx,
80        _target: Target,
81        cmd: &Command,
82        data: &mut String,
83        _env: &Env,
84    ) -> Handled {
85        if let Some(file_info) = cmd.get(commands::SAVE_FILE_AS) {
86            if let Err(e) = std::fs::write(file_info.path(), &data[..]) {
87                println!("Error writing file: {e}");
88            }
89            return Handled::Yes;
90        }
91        if let Some(file_info) = cmd.get(commands::OPEN_FILE) {
92            match std::fs::read_to_string(file_info.path()) {
93                Ok(s) => {
94                    let first_line = s.lines().next().unwrap_or("");
95                    *data = first_line.to_owned();
96                }
97                Err(e) => {
98                    println!("Error opening file: {e}");
99                }
100            }
101            return Handled::Yes;
102        }
103        Handled::No
104    }
105}
open_save/open_save.rs

open_save/
open_save.rs
