package examples;

import java.io.IOException;

import java.io.InputStream;

import ch.bailu.gtk.cairo.Context;

import ch.bailu.gtk.gdk.Gdk;

import ch.bailu.gtk.gdkpixbuf.Pixbuf;

import ch.bailu.gtk.gdkpixbuf.PixbufFormat;

import ch.bailu.gtk.gtk.DrawingArea;

import ch.bailu.gtk.gtk.Window;

import ch.bailu.gtk.lib.bridge.Image;

import ch.bailu.gtk.lib.handler.CallbackHandler;

import ch.bailu.gtk.lib.handler.SignalHandler;

import ch.bailu.gtk.lib.util.JavaResource;

import ch.bailu.gtk.type.Str;

public class ImageBridge implements DemoInterface {

private static final Str TITLE = new Str("Image bridge");

private static final Str DESCRIPTION = new Str("Load and display GTK logo from Java stream");

private Pixbuf pixbuf = null;

@Override

public Window runDemo() {

listSupportedFormats();

var demoWindow = new Window();

demoWindow.setSizeRequest(300, 300);

var drawingArea = new DrawingArea();

demoWindow.setChild(drawingArea);

drawingArea.onResize(this::setPixbuf);

drawingArea.setDrawFunc((cb, drawing_area, cr, width, height, user_data) -> drawLogo(cr), null, (cb, data)->{});

demoWindow.onDestroy(() -> {

CallbackHandler.unregister(drawingArea);

SignalHandler.disconnect(demoWindow);

});

return demoWindow;

}

private void listSupportedFormats() {

var list = Pixbuf.getFormats();

int count = 1;

while(list.isNotNull() && list.getFieldData().isNotNull()) {

var format = new PixbufFormat(list.getFieldData().cast());

System.out.println("__");

System.out.println("Format " + count + ":");

System.out.println(format.getName());

System.out.println(format.getDescription());

if (format.isDisabled()) {

System.out.println("disabled");

}

if (format.isScalable()) {

System.out.println("scalable");

}

if (format.isWritable()) {

System.out.println("writeable");

}

list = list.getFieldNext();

count ++;

}

}

private void setPixbuf(int width, int height) {

try {

var pixbufNew = loadPixbuf(width, height);

if (pixbuf != null) {

pixbuf.unref();

}

pixbuf = pixbufNew;

} catch (IOException e) {

System.err.println("ERROR reading image");

}

}

private Pixbuf loadPixbuf(int width, int height) throws IOException {

try (InputStream inputStream = new JavaResource("/GTK.svg").asStream()) {

return Image.load(inputStream, width, height);

}

}

private boolean drawLogo(Context context) {

if (pixbuf != null) {

context.save();

Gdk.cairoSetSourcePixbuf(context, pixbuf, 0, 0);

context.paint();

return true;

}

return false;

}

@Override

public Str getTitle() {

return TITLE;

}

@Override

public Str getDescription() {

return DESCRIPTION;

}

}