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files.js
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files.js
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(function(Scratch) {
'use strict';
const vm = Scratch.vm;
const showFilePrompt = (accept) => new Promise((_resolve) => {
// We can't reliably show an <input> picker without "user interaction" in all environments,
// so we have to show our own UI anyways. We may as well use this to implement some nice features
// that native file pickers don't have:
// - Easy drag+drop
// - Reliable cancel button (input cancel event is still basically nonexistent)
// This is important so we can make this just a reporter instead of a command+hat block.
// Without an interface, the script would be stalled if the prompt was just cancelled.
/** @param {string} text */
const callback = (text) => {
_resolve(text);
outer.remove();
document.body.removeEventListener('keydown', handleKeyDown);
};
let isReadingFile = false;
/** @param {File} file */
const readFile = (file) => {
if (isReadingFile) {
return;
}
isReadingFile = true;
const reader = new FileReader();
reader.onload = () => {
callback(reader.result);
};
reader.onerror = () => {
console.error('Failed to read file as text', reader.error);
callback('');
};
reader.readAsText(file);
};
/** @param {KeyboardEvent} e */
const handleKeyDown = (e) => {
if (e.key === 'Escape') {
e.stopPropagation();
e.preventDefault();
callback('');
}
};
document.body.addEventListener('keydown', handleKeyDown, {
capture: true
});
const INITIAL_BORDER_COLOR = '#888';
const DROPPING_BORDER_COLOR = '#03a9fc';
const outer = document.createElement('div');
outer.className = 'extension-content';
outer.style.position = 'fixed';
outer.style.top = '0';
outer.style.left = '0';
outer.style.width = '100%';
outer.style.height = '100%';
outer.style.display = 'flex';
outer.style.alignItems = 'center';
outer.style.justifyContent = 'center';
outer.style.background = 'rgba(0, 0, 0, 0.5)';
outer.style.zIndex = '20000';
outer.style.color = 'black';
outer.style.colorScheme = 'light';
outer.addEventListener('dragover', (e) => {
if (e.dataTransfer.types.includes('Files')) {
e.preventDefault();
e.dataTransfer.dropEffect = 'copy';
modal.style.borderColor = DROPPING_BORDER_COLOR;
}
});
outer.addEventListener('dragleave', () => {
modal.style.borderColor = INITIAL_BORDER_COLOR;
});
outer.addEventListener('drop', (e) => {
const file = e.dataTransfer.files[0];
if (file) {
e.preventDefault();
readFile(file);
}
});
outer.addEventListener('click', (e) => {
if (e.target === outer) {
callback('');
}
});
const modal = document.createElement('button');
modal.style.boxShadow = '0 0 10px -5px currentColor';
modal.style.cursor = 'pointer';
modal.style.font = 'inherit';
modal.style.background = 'white';
modal.style.padding = '16px';
modal.style.borderRadius = '16px';
modal.style.border = `8px dashed ${INITIAL_BORDER_COLOR}`;
modal.style.position = 'relative';
modal.style.textAlign = 'center';
modal.addEventListener('click', () => {
input.click();
});
modal.focus();
outer.appendChild(modal);
const input = document.createElement('input');
input.type = 'file';
input.accept = accept;
input.addEventListener('change', (e) => {
const file = e.target.files[0];
if (file) {
readFile(file);
}
});
const title = document.createElement('div');
title.textContent = 'Select or drop file';
title.style.fontSize = '1.5em';
title.style.marginBottom = '8px';
modal.appendChild(title);
const subtitle = document.createElement('div');
subtitle.textContent = `Accepted formats: ${accept}`;
modal.appendChild(subtitle);
document.body.appendChild(outer);
});
const download = (text, file) => {
const blob = new Blob([text]);
const url = URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = url;
link.download = file;
document.body.appendChild(link);
link.click();
link.remove();
URL.revokeObjectURL(url);
};
class Files {
getInfo () {
return {
id: 'files',
name: 'Files',
color1: '#fcb103',
color2: '#db9a37',
color3: '#db8937',
blocks: [
{
opcode: 'showPicker',
blockType: Scratch.BlockType.REPORTER,
text: 'open a file',
disableMonitor: true
},
{
opcode: 'showPickerExtensions',
blockType: Scratch.BlockType.REPORTER,
text: 'open a [extension] file',
arguments: {
extension: {
type: Scratch.ArgumentType.STRING,
defaultValue: '.txt'
}
}
},
{
opcode: 'download',
blockType: Scratch.BlockType.COMMAND,
text: 'download [text] as [file]',
arguments: {
text: {
type: Scratch.ArgumentType.STRING,
defaultValue: 'Hello, world!'
},
file: {
type: Scratch.ArgumentType.STRING,
defaultValue: 'save.txt'
}
}
}
]
};
}
showPicker () {
return showFilePrompt('');
}
showPickerExtensions (args) {
return showFilePrompt(args.extension);
}
download (args) {
download(args.text, args.file);
}
}
Scratch.extensions.register(new Files());
})(Scratch);