native-windows-gui 1.0.13

A rust library to develop native GUI applications on the desktop for Microsoft Windows. Native-windows-gui wraps the native win32 window controls in a rustic API
Documentation 
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/*!

    A application that uses the `image-decoder` feature to load resources and display them.

    Requires the following features: `cargo run --example image_decoder_d --features "image-decoder file-dialog"`
*/


extern crate native_windows_gui as nwg;
extern crate native_windows_derive as nwd;

use nwd::NwgUi;
use nwg::NativeUi;
use std::{env};
use std::cell::RefCell;


#[derive(Default, NwgUi)]
pub struct ImageDecoderApp {
    // The image that will be loaded dynamically
    loaded_image: RefCell<Option<nwg::Bitmap>>,

    #[nwg_control(size: (400, 300), position: (400, 150), title: "Image decoder")]
    #[nwg_events( OnWindowClose: [ImageDecoderApp::exit] )]
    window: nwg::Window,

    #[nwg_layout(parent: window, max_row: Some(5), max_column: Some(5) )]
    main_layout: nwg::GridLayout,

    #[nwg_resource]
    decoder: nwg::ImageDecoder,

    #[nwg_resource(title: "Open File", action: nwg::FileDialogAction::Open, filters: "Png(*.png)|Jpeg(*.jpg;*.jpeg)|DDS(*.dds)|TIFF(*.tiff)|BMP(*.bmp)|Any (*.*)")]
    dialog: nwg::FileDialog,

    #[nwg_control(text: "Open", focus: true)]
    #[nwg_layout_item(layout: main_layout, col: 0, row: 0)]
    #[nwg_events(OnButtonClick: [ImageDecoderApp::open_file])]
    open_btn: nwg::Button,

    #[nwg_control(readonly: true)]
    #[nwg_layout_item(layout: main_layout, col: 1, row: 0, col_span: 4)]
    file_name: nwg::TextInput,

    #[nwg_control]
    #[nwg_layout_item(layout: main_layout, col: 0, row: 1, col_span: 5, row_span: 4)]
    img: nwg::ImageFrame,
}

impl ImageDecoderApp {

    fn open_file(&self) {
        if let Ok(d) = env::current_dir() {
            if let Some(d) = d.to_str() {
                self.dialog.set_default_folder(d).expect("Failed to set default folder.");
            }
        }
        
        if self.dialog.run(Some(&self.window)) {
            self.file_name.set_text("");
            if let Ok(directory) = self.dialog.get_selected_item() {
                let dir = directory.into_string().unwrap();
                self.file_name.set_text(&dir);
                self.read_file();
            }
        }
    }

    fn read_file(&self) {
        println!("{}", self.file_name.text());
        let image = match self.decoder.from_filename(&self.file_name.text()) {
            Ok(img) => img,
            Err(_) => { println!("Could not read image!"); return; }
        };
        
        println!("Frame count: {}", image.frame_count());
        println!("Format: {:?}", image.container_format());

        let frame = match image.frame(0) {
            Ok(bmp) => bmp,
            Err(_) => { println!("Could not read image frame!"); return; }
        };

        println!("Resolution: {:?}", frame.resolution());
        println!("Size: {:?}", frame.size());

        // Create a new Bitmap image from the image data
        match frame.as_bitmap() {
            Ok(bitmap) => {
                let mut img = self.loaded_image.borrow_mut();
                img.replace(bitmap);
                self.img.set_bitmap(img.as_ref());
            },
            Err(_) => { println!("Could not convert image to bitmap!"); }
        }
    }

    fn exit(&self) {
        nwg::stop_thread_dispatch();
    }

}

fn main() {
    nwg::init().expect("Failed to init Native Windows GUI");
    nwg::Font::set_global_family("Segoe UI").expect("Failed to set default font");

    let _app = ImageDecoderApp::build_ui(Default::default()).expect("Failed to build UI");

    nwg::dispatch_thread_events();
}