ComfyUI/web/scripts/widgets.js

function getNumberDefaults(inputData, defaultStep) {
	let defaultVal = inputData[1]["default"];
	let { min, max, step } = inputData[1];

	if (defaultVal == undefined) defaultVal = 0;
	if (min == undefined) min = 0;
	if (max == undefined) max = 2048;
	if (step == undefined) step = defaultStep;

	return { val: defaultVal, config: { min, max, step: 10.0 * step } };
}

function seedWidget(node, inputName, inputData) {
	const seed = ComfyWidgets.INT(node, inputName, inputData);
	const randomize = node.addWidget("toggle", "Random seed after every gen", true, function (v) {}, {
		on: "enabled",
		off: "disabled",
		serialize: false, // Don't include this in prompt.
	});

	randomize.afterQueued = () => {
		if (randomize.value) {
			seed.widget.value = Math.floor(Math.random() * 1125899906842624);
		}
	};

	return { widget: seed, randomize };
}

function addMultilineWidget(node, name, defaultVal, app) {
	const widget = {
		type: "customtext",
		name,
		get value() {
			return this.inputEl.value;
		},
		set value(x) {
			this.inputEl.value = x;
		},
		draw: function (ctx, _, widgetWidth, y, widgetHeight) {
			const visible = app.canvas.ds.scale > 0.5;
			const t = ctx.getTransform();
			const margin = 10;
			Object.assign(this.inputEl.style, {
				left: `${t.a * margin + t.e}px`,
				top: `${t.d * (y + widgetHeight - margin) + t.f}px`,
				width: `${(widgetWidth - margin * 2 - 3) * t.a}px`,
				height: `${(this.parent.size[1] - (y + widgetHeight) - 3) * t.d}px`,
				position: "absolute",
				zIndex: 1,
				fontSize: `${t.d * 10.0}px`,
			});
			this.inputEl.hidden = !visible;
		},
	};
	widget.inputEl = document.createElement("textarea");
	widget.inputEl.className = "comfy-multiline-input";
	widget.inputEl.value = defaultVal;
	document.addEventListener("click", function (event) {
		if (!widget.inputEl.contains(event.target)) {
			widget.inputEl.blur();
		}
	});
	widget.parent = node;
	document.body.appendChild(widget.inputEl);

	node.addCustomWidget(widget);

	app.canvas.onDrawBackground = function () {
		// Draw node isnt fired once the node is off the screen
		// if it goes off screen quickly, the input may not be removed
		// this shifts it off screen so it can be moved back if the node is visible.
		for (let n in app.graph._nodes) {
			n = graph._nodes[n];
			for (let w in n.widgets) {
				let wid = n.widgets[w];
				if (Object.hasOwn(wid, "inputEl")) {
					wid.inputEl.style.left = -8000 + "px";
					wid.inputEl.style.position = "absolute";
				}
			}
		}
	};

	node.onRemoved = function () {
		// When removing this node we need to remove the input from the DOM
		for (let y in this.widgets) {
			if (this.widgets[y].inputEl) {
				this.widgets[y].inputEl.remove();
			}
		}
	};

	return { minWidth: 400, minHeight: 200, widget };
}

export const ComfyWidgets = {
	"INT:seed": seedWidget,
	"INT:noise_seed": seedWidget,
	FLOAT(node, inputName, inputData) {
		const { val, config } = getNumberDefaults(inputData, 0.5);
		return { widget: node.addWidget("number", inputName, val, () => {}, config) };
	},
	INT(node, inputName, inputData) {
		const { val, config } = getNumberDefaults(inputData, 1);
		return {
			widget: node.addWidget(
				"number",
				inputName,
				val,
				function (v) {
					const s = this.options.step / 10;
					this.value = Math.round(v / s) * s;
				},
				config
			),
		};
	},
	STRING(node, inputName, inputData, app) {
		const defaultVal = inputData[1].default || "";
		const multiline = !!inputData[1].multiline;

		if (multiline) {
			return addMultilineWidget(node, inputName, defaultVal, app);
		} else {
			return { widget: node.addWidget("text", inputName, defaultVal, () => {}, {}) };
		}
	},
	IMAGEUPLOAD(node, inputName, inputData, app) {
		const imageWidget = node.widgets.find((w) => w.name === "image");
		let uploadWidget;

		function showImage(name) {
			// Position the image somewhere sensible
			if (!node.imageOffset) {
				node.imageOffset = uploadWidget.last_y ? uploadWidget.last_y + 25 : 75;
			}

			const img = new Image();
			img.onload = () => {
				node.imgs = [img];
				app.graph.setDirtyCanvas(true);
			};
			img.src = `/view/${name}?type=input`;
		}

		// Add our own callback to the combo widget to render an image when it changes
		const cb = node.callback;
		imageWidget.callback = function () {
			showImage(imageWidget.value);
			if (cb) {
				return cb.apply(this, arguments);
			}
		};

		// On load if we have a value then render the image
		// The value isnt set immediately so we need to wait a moment
		// No change callbacks seem to be fired on initial setting of the value
		requestAnimationFrame(() => {
			if (imageWidget.value) {
				showImage(imageWidget.value);
			}
		});

		async function uploadFile(file, updateNode) {
			try {
				// Wrap file in formdata so it includes filename
				const body = new FormData();
				body.append("image", file);
				const resp = await fetch("/upload/image", {
					method: "POST",
					body,
				});

				if (resp.status === 200) {
					const data = await resp.json();
					// Add the file as an option and update the widget value
					if (!imageWidget.options.values.includes(data.name)) {
						imageWidget.options.values.push(data.name);
					}

					if (updateNode) {
						showImage(data.name);

						imageWidget.value = data.name;
					}
				} else {
					alert(resp.status + " - " + resp.statusText);
				}
			} catch (error) {
				alert(error);
			}
		}

		const fileInput = document.createElement("input");
		Object.assign(fileInput, {
			type: "file",
			accept: "image/jpeg,image/png",
			style: "display: none",
			onchange: async () => {
				if (fileInput.files.length) {
					await uploadFile(fileInput.files[0], true);
				}
			},
		});
		document.body.append(fileInput);

		// Create the button widget for selecting the files
		uploadWidget = node.addWidget("button", "choose file to upload", "image", () => {
			fileInput.click();
		});
		uploadWidget.serialize = false;

		// Add handler to check if an image is being dragged over our node
		node.onDragOver = function (e) {
			if (e.dataTransfer && e.dataTransfer.items) {
				const image = [...e.dataTransfer.items].find((f) => f.kind === "file" && f.type.startsWith("image/"));
				return !!image;
			}

			return false;
		};

		// On drop upload files
		node.onDragDrop = function (e) {
			console.log("onDragDrop called");
			let handled = false;
			for (const file of e.dataTransfer.files) {
				if (file.type.startsWith("image/")) {
					uploadFile(file, !handled); // Dont await these, any order is fine, only update on first one
					handled = true;
				}
			}

			return handled;
		};

		return { widget: uploadWidget };
	},
};