Add support for simple tooltips

nodes.py

@@ -47,11 +47,18 @@ def interrupt_processing(value=True):
 class CLIPTextEncode:
     @classmethod
     def INPUT_TYPES(s):
-        return {"required": {"text": ("STRING", {"multiline": True, "dynamicPrompts": True}), "clip": ("CLIP", )}}
+        return {
+            "required": {
+                "text": ("STRING", {"multiline": True, "dynamicPrompts": True, "tooltip": "The text to be encoded."}), 
+                "clip": ("CLIP", {"tooltip": "The CLIP model used for encoding the text."})
+            }
+        }
     RETURN_TYPES = ("CONDITIONING",)
+    OUTPUT_TOOLTIPS = ("A conditioning containing the embedded text used to guide the diffusion model.",)
     FUNCTION = "encode"
 
     CATEGORY = "conditioning"
+    DESCRIPTION = "Encodes a text prompt using a CLIP model into an embedding that can be used to guide the diffusion model towards generating specific images."
 
     def encode(self, clip, text):
         tokens = clip.tokenize(text)
@@ -260,11 +267,18 @@ def set_range(self, conditioning, start, end):
 class VAEDecode:
     @classmethod
     def INPUT_TYPES(s):
-        return {"required": { "samples": ("LATENT", ), "vae": ("VAE", )}}
+        return {
+            "required": { 
+                "samples": ("LATENT", {"tooltip": "The latent to be decoded."}), 
+                "vae": ("VAE", {"tooltip": "The VAE model used for decoding the latent."})
+            }
+        }
     RETURN_TYPES = ("IMAGE",)
+    OUTPUT_TOOLTIPS = ("The decoded image.",)
     FUNCTION = "decode"
 
     CATEGORY = "latent"
+    DESCRIPTION = "Decodes latent images back into pixel space images."
 
     def decode(self, vae, samples):
         return (vae.decode(samples["samples"]), )
@@ -506,12 +520,19 @@ def load_checkpoint(self, config_name, ckpt_name):
 class CheckpointLoaderSimple:
     @classmethod
     def INPUT_TYPES(s):
-        return {"required": { "ckpt_name": (folder_paths.get_filename_list("checkpoints"), ),
-                             }}
+        return {
+            "required": { 
+                "ckpt_name": (folder_paths.get_filename_list("checkpoints"), {"tooltip": "The name of the checkpoint (model) to load."}),
+            }
+        }
     RETURN_TYPES = ("MODEL", "CLIP", "VAE")
+    OUTPUT_TOOLTIPS = ("The model used for denoising latents.", 
+                       "The CLIP model used for encoding text prompts.", 
+                       "The VAE model used for encoding and decoding images to and from latent space.")
     FUNCTION = "load_checkpoint"
 
     CATEGORY = "loaders"
+    DESCRIPTION = "Loads a diffusion model checkpoint, diffusion models are used to denoise latents."
 
     def load_checkpoint(self, ckpt_name):
         ckpt_path = folder_paths.get_full_path("checkpoints", ckpt_name)
@@ -582,16 +603,22 @@ def __init__(self):
 
     @classmethod
     def INPUT_TYPES(s):
-        return {"required": { "model": ("MODEL",),
-                              "clip": ("CLIP", ),
-                              "lora_name": (folder_paths.get_filename_list("loras"), ),
-                              "strength_model": ("FLOAT", {"default": 1.0, "min": -100.0, "max": 100.0, "step": 0.01}),
-                              "strength_clip": ("FLOAT", {"default": 1.0, "min": -100.0, "max": 100.0, "step": 0.01}),
-                              }}
+        return {
+            "required": { 
+                "model": ("MODEL", {"tooltip": "The diffusion model the LoRA will be applied to."}),
+                "clip": ("CLIP", {"tooltip": "The CLIP model the LoRA will be applied to."}),
+                "lora_name": (folder_paths.get_filename_list("loras"), {"tooltip": "The name of the LoRA."}),
+                "strength_model": ("FLOAT", {"default": 1.0, "min": -100.0, "max": 100.0, "step": 0.01, "tooltip": "How strongly to modify the diffusion model. This value can be negative."}),
+                "strength_clip": ("FLOAT", {"default": 1.0, "min": -100.0, "max": 100.0, "step": 0.01, "tooltip": "How strongly to modify the CLIP model. This value can be negative."}),
+            }
+        }
+
     RETURN_TYPES = ("MODEL", "CLIP")
+    OUTPUT_TOOLTIPS = ("The modified diffusion model.", "The modified CLIP model.")
     FUNCTION = "load_lora"
 
     CATEGORY = "loaders"
+    DESCRIPTION = "LoRAs are used to modify diffusion and CLIP models, altering the way in which latents are denoised such as applying styles. Multiple LoRA nodes can be linked together."
 
     def load_lora(self, model, clip, lora_name, strength_model, strength_clip):
         if strength_model == 0 and strength_clip == 0:
@@ -1033,13 +1060,19 @@ def __init__(self):
 
     @classmethod
     def INPUT_TYPES(s):
-        return {"required": { "width": ("INT", {"default": 512, "min": 16, "max": MAX_RESOLUTION, "step": 8}),
-                              "height": ("INT", {"default": 512, "min": 16, "max": MAX_RESOLUTION, "step": 8}),
-                              "batch_size": ("INT", {"default": 1, "min": 1, "max": 4096})}}
+        return {
+            "required": { 
+                "width": ("INT", {"default": 512, "min": 16, "max": MAX_RESOLUTION, "step": 8, "tooltip": "The width of the latent images in pixels."}),
+                "height": ("INT", {"default": 512, "min": 16, "max": MAX_RESOLUTION, "step": 8, "tooltip": "The height of the latent images in pixels."}),
+                "batch_size": ("INT", {"default": 1, "min": 1, "max": 4096, "tooltip": "The number of latent images in the batch."})
+            }
+        }
     RETURN_TYPES = ("LATENT",)
+    OUTPUT_TOOLTIPS = ("The empty latent image batch.",)
     FUNCTION = "generate"
 
     CATEGORY = "latent"
+    DESCRIPTION = "Create a new batch of empty latent images to be denoised via sampling."
 
     def generate(self, width, height, batch_size=1):
         latent = torch.zeros([batch_size, 4, height // 8, width // 8], device=self.device)
@@ -1359,24 +1392,27 @@ def common_ksampler(model, seed, steps, cfg, sampler_name, scheduler, positive,
 class KSampler:
     @classmethod
     def INPUT_TYPES(s):
-        return {"required":
-                    {"model": ("MODEL",),
-                    "seed": ("INT", {"default": 0, "min": 0, "max": 0xffffffffffffffff}),
-                    "steps": ("INT", {"default": 20, "min": 1, "max": 10000}),
-                    "cfg": ("FLOAT", {"default": 8.0, "min": 0.0, "max": 100.0, "step":0.1, "round": 0.01}),
-                    "sampler_name": (comfy.samplers.KSampler.SAMPLERS, ),
-                    "scheduler": (comfy.samplers.KSampler.SCHEDULERS, ),
-                    "positive": ("CONDITIONING", ),
-                    "negative": ("CONDITIONING", ),
-                    "latent_image": ("LATENT", ),
-                    "denoise": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 1.0, "step": 0.01}),
-                     }
-                }
+        return {
+            "required": {
+                "model": ("MODEL", {"tooltip": "The model used for denoising the input latent."}),
+                "seed": ("INT", {"default": 0, "min": 0, "max": 0xffffffffffffffff, "tooltip": "The random seed used for creating the noise."}),
+                "steps": ("INT", {"default": 20, "min": 1, "max": 10000, "tooltip": "The number of steps used in the denoising process."}),
+                "cfg": ("FLOAT", {"default": 8.0, "min": 0.0, "max": 100.0, "step":0.1, "round": 0.01, "tooltip": "The Classifier-Free Guidance scale balances creativity and adherence to the prompt. Higher values result in images more closely matching the prompt however too high values will negatively impact quality."}),
+                "sampler_name": (comfy.samplers.KSampler.SAMPLERS, {"tooltip": "The algorithm used when sampling, this can affect the quality, speed, and style of the generated output."}),
+                "scheduler": (comfy.samplers.KSampler.SCHEDULERS, {"tooltip": "The scheduler controls how noise is gradually removed to form the image."}),
+                "positive": ("CONDITIONING", {"tooltip": "The conditioning describing the attributes you want to include in the image."}),
+                "negative": ("CONDITIONING", {"tooltip": "The conditioning describing the attributes you want to exclude from the image."}),
+                "latent_image": ("LATENT", {"tooltip": "The latent image to denoise."}),
+                "denoise": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 1.0, "step": 0.01, "tooltip": "The amount of denoising applied, lower values will maintain the structure of the initial image allowing for image to image sampling."}),
+            }
+        }
 
     RETURN_TYPES = ("LATENT",)
+    OUTPUT_TOOLTIPS = ("The denoised latent.",)
     FUNCTION = "sample"
 
     CATEGORY = "sampling"
+    DESCRIPTION = "Uses the provided model, positive and negative conditioning to denoise the latent image."
 
     def sample(self, model, seed, steps, cfg, sampler_name, scheduler, positive, negative, latent_image, denoise=1.0):
         return common_ksampler(model, seed, steps, cfg, sampler_name, scheduler, positive, negative, latent_image, denoise=denoise)
@@ -1424,18 +1460,23 @@ def __init__(self):
 
     @classmethod
     def INPUT_TYPES(s):
-        return {"required": 
-                    {"images": ("IMAGE", ),
-                     "filename_prefix": ("STRING", {"default": "ComfyUI"})},
-                "hidden": {"prompt": "PROMPT", "extra_pnginfo": "EXTRA_PNGINFO"},
-                }
+        return {
+            "required": {
+                "images": ("IMAGE", {"tooltip": "The images to save."}),
+                "filename_prefix": ("STRING", {"default": "ComfyUI", "tooltip": "The prefix for the file to save. This may include formatting information such as %date:yyyy-MM-dd% or %Empty Latent Image.width% to include values from nodes."})
+            },
+            "hidden": {
+                "prompt": "PROMPT", "extra_pnginfo": "EXTRA_PNGINFO"
+            },
+        }
 
     RETURN_TYPES = ()
     FUNCTION = "save_images"
 
     OUTPUT_NODE = True
 
     CATEGORY = "image"
+    DESCRIPTION = "Saves the input images to your ComfyUI output directory."
 
     def save_images(self, images, filename_prefix="ComfyUI", prompt=None, extra_pnginfo=None):
         filename_prefix += self.prefix_append

server.py

@@ -433,6 +433,9 @@ def node_info(node_class):
 
             if hasattr(obj_class, 'CATEGORY'):
                 info['category'] = obj_class.CATEGORY
+
+            if hasattr(obj_class, 'OUTPUT_TOOLTIPS'):
+                info['output_tooltips'] = obj_class.OUTPUT_TOOLTIPS
             return info
 
         @routes.get("/object_info")

web/extensions/core/tooltips.js

@@ -0,0 +1,122 @@
+import { app } from "../../scripts/app.js";
+import { $el } from "../../scripts/ui.js";
+
+// Adds support for tooltips
+
+function getHoveredWidget() {
+	if (!app) {
+		return;
+	}
+
+	const node = app.canvas.node_over;
+	if (!node.widgets) return;
+
+	const graphPos = app.canvas.graph_mouse;
+
+	const x = graphPos[0] - node.pos[0];
+	const y = graphPos[1] - node.pos[1];
+
+	for (const w of node.widgets) {
+		let widgetWidth, widgetHeight;
+		if (w.computeSize) {
+			const sz = w.computeSize();
+			widgetWidth = sz[0];
+			widgetHeight = sz[1];
+		} else {
+			widgetWidth = w.width || node.size[0];
+			widgetHeight = LiteGraph.NODE_WIDGET_HEIGHT;
+		}
+
+		if (w.last_y !== undefined && x >= 6 && x <= widgetWidth - 12 && y >= w.last_y && y <= w.last_y + widgetHeight) {
+			return w;
+		}
+	}
+}
+
+app.registerExtension({
+	name: "Comfy.Tooltips",
+	setup() {
+		const tooltipEl = $el("div.comfy-graph-tooltip", {
+			parent: document.body,
+		});
+		let idleTimeout;
+
+		const hideTooltip = () => {
+			tooltipEl.style.display = "none";
+		};
+		const showTooltip = (tooltip) => {
+			if (!tooltip) return;
+
+			tooltipEl.textContent = tooltip;
+			tooltipEl.style.display = "block";
+			tooltipEl.style.left = app.canvas.mouse[0] + "px";
+			tooltipEl.style.top = app.canvas.mouse[1] + "px";
+			const rect = tooltipEl.getBoundingClientRect();
+			if (rect.right > window.innerWidth) {
+				tooltipEl.style.left = app.canvas.mouse[0] - rect.width + "px";
+			}
+
+			if (rect.top < 0) {
+				tooltipEl.style.top = app.canvas.mouse[1] + rect.height + "px";
+			}
+		};
+		const getInputTooltip = (nodeData, name) => {
+			const inputDef = nodeData.input?.required?.[name] ?? nodeData.input?.optional?.[name];
+			return inputDef?.[1]?.tooltip;
+		};
+		const onIdle = () => {
+			const { canvas } = app;
+			const node = canvas.node_over;
+			if (!node) return;
+
+			const nodeData = node.constructor.nodeData ?? {};
+
+			if (node.constructor.title_mode !== LiteGraph.NO_TITLE && canvas.graph_mouse[1] < node.pos[1]) {
+				return showTooltip(nodeData.description);
+			}
+
+			if (node.flags?.collapsed) return;
+
+			const inputSlot = canvas.isOverNodeInput(node, canvas.graph_mouse[0], canvas.graph_mouse[1], [0, 0]);
+			if (inputSlot !== -1) {
+				const inputName = node.inputs[inputSlot].name;
+				return showTooltip(getInputTooltip(nodeData, inputName));
+			}
+
+			const outputSlot = canvas.isOverNodeOutput(node, canvas.graph_mouse[0], canvas.graph_mouse[1], [0, 0]);
+			if (outputSlot !== -1) {
+				return showTooltip(nodeData.output_tooltips?.[outputSlot]);
+			}
+
+			const widget = getHoveredWidget();
+			// Dont show for DOM widgets, these use native browser tooltips as we dont get proper mouse events on these
+			if (widget && !widget.element) {
+				return showTooltip(widget.tooltip ?? getInputTooltip(nodeData, widget.name));
+			}
+		};
+
+		const onMouseMove = (e) => {
+			hideTooltip();
+			clearTimeout(idleTimeout);
+
+			if(e.target.nodeName !== "CANVAS") return
+			idleTimeout = setTimeout(onIdle, 500);
+		};
+
+		app.ui.settings.addSetting({
+			id: "Comfy.EnableTooltips",
+			name: "Enable Tooltips",
+			type: "boolean",
+			defaultValue: true,
+			onChange(value) {
+				if (value) {
+					window.addEventListener("mousemove", onMouseMove);
+					window.addEventListener("click", hideTooltip);
+				} else {
+					window.removeEventListener("mousemove", onMouseMove);
+					window.removeEventListener("click", hideTooltip);
+				}
+			},
+		});
+	},
+});

web/extensions/core/widgetInputs.js

@@ -181,7 +181,7 @@ export function mergeIfValid(output, config2, forceUpdate, recreateWidget, confi
 
 	const isNumber = config1[0] === "INT" || config1[0] === "FLOAT";
 	for (const k of keys.values()) {
-		if (k !== "default" && k !== "forceInput" && k !== "defaultInput" && k !== "control_after_generate" && k !== "multiline") {
+		if (k !== "default" && k !== "forceInput" && k !== "defaultInput" && k !== "control_after_generate" && k !== "multiline" && k !== "tooltip") {
 			let v1 = config1[1][k];
 			let v2 = config2[1]?.[k];
 

web/scripts/app.js

@@ -1713,9 +1713,10 @@ export class ComfyApp {
 				for (const o in nodeData["output"]) {
 					let output = nodeData["output"][o];
 					if(output instanceof Array) output = "COMBO";
+					const outputTooltip = nodeData["output_tooltips"]?.[o];
 					const outputName = nodeData["output_name"][o] || output;
 					const outputShape = nodeData["output_is_list"][o] ? LiteGraph.GRID_SHAPE : LiteGraph.CIRCLE_SHAPE ;
-					this.addOutput(outputName, output, { shape: outputShape });
+					this.addOutput(outputName, output, { shape: outputShape, tooltip: outputTooltip });
 				}
 
 				const s = this.computeSize();

web/scripts/domWidget.js

@@ -223,6 +223,12 @@ LGraphNode.prototype.addDOMWidget = function (name, type, element, options) {
 		document.addEventListener("mousedown", mouseDownHandler);
 	}
 
+	const { nodeData } = this.constructor;
+	const tooltip = (nodeData?.input.required?.[name] ?? nodeData?.input.optional?.[name])?.[1]?.tooltip;
+	if (tooltip && !element.title) {
+		element.title = tooltip;
+	}
+
 	const widget = {
 		type,
 		name,

web/scripts/widgets.js

@@ -75,6 +75,7 @@ export function addValueControlWidgets(node, targetWidget, defaultValue = "rando
 			serialize: false, // Don't include this in prompt.
 		}
 	);
+	valueControl.tooltip = "Allows the linked widget to be changed automatically, for example randomizing the noise seed.";
 	valueControl[IS_CONTROL_WIDGET] = true;
 	updateControlWidgetLabel(valueControl);
 	widgets.push(valueControl);
@@ -95,6 +96,7 @@ export function addValueControlWidgets(node, targetWidget, defaultValue = "rando
 			}
 		);
 		updateControlWidgetLabel(comboFilter);
+		comboFilter.tooltip = "Allows for filtering the list of values when changing the value via the control generate mode. Allows for RegEx matches in the format /abc/ to only filter to values containing 'abc'."
 
 		widgets.push(comboFilter);
 	}

web/style.css

@@ -645,3 +645,20 @@ dialog::backdrop {
 audio.comfy-audio.empty-audio-widget {
 	display: none;
 }
+
+.comfy-graph-tooltip {
+	background: var(--comfy-input-bg);
+	border-radius: 5px;
+	box-shadow: 0 0 5px rgba(0, 0, 0, 0.4);
+	color: var(--input-text);
+	display: none;
+	font-family: sans-serif;
+	left: 0;
+	max-width: 30vw;
+	padding: 4px 8px;
+	position: absolute;
+	top: 0;
+	transform: translate(5px, calc(-100% - 5px));
+	white-space: pre-wrap;
+	z-index: 99999;
+}