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Merge pull request iced-rs#1845 from bungoboingo/feat/offscreen-rende…
…ring Feat: Offscreen Rendering & Screenshots
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[package] | ||
name = "screenshot" | ||
version = "0.1.0" | ||
authors = ["Bingus <[email protected]>"] | ||
edition = "2021" | ||
publish = false | ||
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[dependencies] | ||
iced = { path = "../..", features = ["debug", "image", "advanced"] } | ||
image = { version = "0.24.6", features = ["png"]} | ||
env_logger = "0.10.0" |
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use iced::alignment; | ||
use iced::keyboard::KeyCode; | ||
use iced::theme::{Button, Container}; | ||
use iced::widget::{button, column, container, image, row, text, text_input}; | ||
use iced::window::screenshot::{self, Screenshot}; | ||
use iced::{ | ||
event, executor, keyboard, subscription, Alignment, Application, Command, | ||
ContentFit, Element, Event, Length, Rectangle, Renderer, Subscription, | ||
Theme, | ||
}; | ||
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use ::image as img; | ||
use ::image::ColorType; | ||
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fn main() -> iced::Result { | ||
env_logger::builder().format_timestamp(None).init(); | ||
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Example::run(iced::Settings::default()) | ||
} | ||
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struct Example { | ||
screenshot: Option<Screenshot>, | ||
saved_png_path: Option<Result<String, PngError>>, | ||
png_saving: bool, | ||
crop_error: Option<screenshot::CropError>, | ||
x_input_value: Option<u32>, | ||
y_input_value: Option<u32>, | ||
width_input_value: Option<u32>, | ||
height_input_value: Option<u32>, | ||
} | ||
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#[derive(Clone, Debug)] | ||
enum Message { | ||
Crop, | ||
Screenshot, | ||
ScreenshotData(Screenshot), | ||
Png, | ||
PngSaved(Result<String, PngError>), | ||
XInputChanged(Option<u32>), | ||
YInputChanged(Option<u32>), | ||
WidthInputChanged(Option<u32>), | ||
HeightInputChanged(Option<u32>), | ||
} | ||
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impl Application for Example { | ||
type Executor = executor::Default; | ||
type Message = Message; | ||
type Theme = Theme; | ||
type Flags = (); | ||
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fn new(_flags: Self::Flags) -> (Self, Command<Self::Message>) { | ||
( | ||
Example { | ||
screenshot: None, | ||
saved_png_path: None, | ||
png_saving: false, | ||
crop_error: None, | ||
x_input_value: None, | ||
y_input_value: None, | ||
width_input_value: None, | ||
height_input_value: None, | ||
}, | ||
Command::none(), | ||
) | ||
} | ||
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fn title(&self) -> String { | ||
"Screenshot".to_string() | ||
} | ||
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fn update(&mut self, message: Self::Message) -> Command<Self::Message> { | ||
match message { | ||
Message::Screenshot => { | ||
return iced::window::screenshot(Message::ScreenshotData); | ||
} | ||
Message::ScreenshotData(screenshot) => { | ||
self.screenshot = Some(screenshot); | ||
} | ||
Message::Png => { | ||
if let Some(screenshot) = &self.screenshot { | ||
self.png_saving = true; | ||
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return Command::perform( | ||
save_to_png(screenshot.clone()), | ||
Message::PngSaved, | ||
); | ||
} | ||
} | ||
Message::PngSaved(res) => { | ||
self.png_saving = false; | ||
self.saved_png_path = Some(res); | ||
} | ||
Message::XInputChanged(new_value) => { | ||
self.x_input_value = new_value; | ||
} | ||
Message::YInputChanged(new_value) => { | ||
self.y_input_value = new_value; | ||
} | ||
Message::WidthInputChanged(new_value) => { | ||
self.width_input_value = new_value; | ||
} | ||
Message::HeightInputChanged(new_value) => { | ||
self.height_input_value = new_value; | ||
} | ||
Message::Crop => { | ||
if let Some(screenshot) = &self.screenshot { | ||
let cropped = screenshot.crop(Rectangle::<u32> { | ||
x: self.x_input_value.unwrap_or(0), | ||
y: self.y_input_value.unwrap_or(0), | ||
width: self.width_input_value.unwrap_or(0), | ||
height: self.height_input_value.unwrap_or(0), | ||
}); | ||
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match cropped { | ||
Ok(screenshot) => { | ||
self.screenshot = Some(screenshot); | ||
self.crop_error = None; | ||
} | ||
Err(crop_error) => { | ||
self.crop_error = Some(crop_error); | ||
} | ||
} | ||
} | ||
} | ||
} | ||
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Command::none() | ||
} | ||
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fn view(&self) -> Element<'_, Self::Message, Renderer<Self::Theme>> { | ||
let image: Element<Message> = if let Some(screenshot) = &self.screenshot | ||
{ | ||
image(image::Handle::from_pixels( | ||
screenshot.size.width, | ||
screenshot.size.height, | ||
screenshot.clone(), | ||
)) | ||
.content_fit(ContentFit::Contain) | ||
.width(Length::Fill) | ||
.height(Length::Fill) | ||
.into() | ||
} else { | ||
text("Press the button to take a screenshot!").into() | ||
}; | ||
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let image = container(image) | ||
.padding(10) | ||
.style(Container::Box) | ||
.width(Length::FillPortion(2)) | ||
.height(Length::Fill) | ||
.center_x() | ||
.center_y(); | ||
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let crop_origin_controls = row![ | ||
text("X:") | ||
.vertical_alignment(alignment::Vertical::Center) | ||
.width(30), | ||
numeric_input("0", self.x_input_value).map(Message::XInputChanged), | ||
text("Y:") | ||
.vertical_alignment(alignment::Vertical::Center) | ||
.width(30), | ||
numeric_input("0", self.y_input_value).map(Message::YInputChanged) | ||
] | ||
.spacing(10) | ||
.align_items(Alignment::Center); | ||
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let crop_dimension_controls = row![ | ||
text("W:") | ||
.vertical_alignment(alignment::Vertical::Center) | ||
.width(30), | ||
numeric_input("0", self.width_input_value) | ||
.map(Message::WidthInputChanged), | ||
text("H:") | ||
.vertical_alignment(alignment::Vertical::Center) | ||
.width(30), | ||
numeric_input("0", self.height_input_value) | ||
.map(Message::HeightInputChanged) | ||
] | ||
.spacing(10) | ||
.align_items(Alignment::Center); | ||
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let mut crop_controls = | ||
column![crop_origin_controls, crop_dimension_controls] | ||
.spacing(10) | ||
.align_items(Alignment::Center); | ||
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if let Some(crop_error) = &self.crop_error { | ||
crop_controls = crop_controls | ||
.push(text(format!("Crop error! \n{}", crop_error))); | ||
} | ||
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let mut controls = column![ | ||
column![ | ||
button(centered_text("Screenshot!")) | ||
.padding([10, 20, 10, 20]) | ||
.width(Length::Fill) | ||
.on_press(Message::Screenshot), | ||
if !self.png_saving { | ||
button(centered_text("Save as png")).on_press_maybe( | ||
self.screenshot.is_some().then(|| Message::Png), | ||
) | ||
} else { | ||
button(centered_text("Saving...")).style(Button::Secondary) | ||
} | ||
.style(Button::Secondary) | ||
.padding([10, 20, 10, 20]) | ||
.width(Length::Fill) | ||
] | ||
.spacing(10), | ||
column![ | ||
crop_controls, | ||
button(centered_text("Crop")) | ||
.on_press(Message::Crop) | ||
.style(Button::Destructive) | ||
.padding([10, 20, 10, 20]) | ||
.width(Length::Fill), | ||
] | ||
.spacing(10) | ||
.align_items(Alignment::Center), | ||
] | ||
.spacing(40); | ||
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if let Some(png_result) = &self.saved_png_path { | ||
let msg = match png_result { | ||
Ok(path) => format!("Png saved as: {:?}!", path), | ||
Err(msg) => { | ||
format!("Png could not be saved due to:\n{:?}", msg) | ||
} | ||
}; | ||
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controls = controls.push(text(msg)); | ||
} | ||
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let side_content = container(controls) | ||
.align_x(alignment::Horizontal::Center) | ||
.width(Length::FillPortion(1)) | ||
.height(Length::Fill) | ||
.center_y() | ||
.center_x(); | ||
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let content = row![side_content, image] | ||
.spacing(10) | ||
.width(Length::Fill) | ||
.height(Length::Fill) | ||
.align_items(Alignment::Center); | ||
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container(content) | ||
.width(Length::Fill) | ||
.height(Length::Fill) | ||
.padding(10) | ||
.center_x() | ||
.center_y() | ||
.into() | ||
} | ||
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fn subscription(&self) -> Subscription<Self::Message> { | ||
subscription::events_with(|event, status| { | ||
if let event::Status::Captured = status { | ||
return None; | ||
} | ||
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if let Event::Keyboard(keyboard::Event::KeyPressed { | ||
key_code: KeyCode::F5, | ||
.. | ||
}) = event | ||
{ | ||
Some(Message::Screenshot) | ||
} else { | ||
None | ||
} | ||
}) | ||
} | ||
} | ||
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async fn save_to_png(screenshot: Screenshot) -> Result<String, PngError> { | ||
let path = "screenshot.png".to_string(); | ||
img::save_buffer( | ||
&path, | ||
&screenshot.bytes, | ||
screenshot.size.width, | ||
screenshot.size.height, | ||
ColorType::Rgba8, | ||
) | ||
.map(|_| path) | ||
.map_err(|err| PngError(format!("{:?}", err))) | ||
} | ||
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#[derive(Clone, Debug)] | ||
struct PngError(String); | ||
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fn numeric_input( | ||
placeholder: &str, | ||
value: Option<u32>, | ||
) -> Element<'_, Option<u32>> { | ||
text_input( | ||
placeholder, | ||
&value | ||
.as_ref() | ||
.map(ToString::to_string) | ||
.unwrap_or_else(String::new), | ||
) | ||
.on_input(move |text| { | ||
if text.is_empty() { | ||
None | ||
} else if let Ok(new_value) = text.parse() { | ||
Some(new_value) | ||
} else { | ||
value | ||
} | ||
}) | ||
.width(40) | ||
.into() | ||
} | ||
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fn centered_text(content: &str) -> Element<'_, Message> { | ||
text(content) | ||
.width(Length::Fill) | ||
.horizontal_alignment(alignment::Horizontal::Center) | ||
.into() | ||
} |
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