Add a simpleimage template for custom components (#7129)

* simpleimage template

* add changeset

* changes

* change

* changes

* update backend

* update frontend

* add changeset

* lint

* fix package

* add changeset

* remove warnings

* docstrings

* fix error

* fixes

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>

.changeset/angry-onions-hope.md

@@ -0,0 +1,7 @@
+---
+"@gradio/app": minor
+"@gradio/simpleimage": minor
+"gradio": minor
+---
+
+feat:Add a `simpleimage` template for custom components

gradio/_simple_templates/__init__.py

@@ -1,4 +1,5 @@
 from .simpledropdown import SimpleDropdown
+from .simpleimage import SimpleImage
 from .simpletextbox import SimpleTextbox
 
-__all__ = ["SimpleDropdown", "SimpleTextbox"]
+__all__ = ["SimpleDropdown", "SimpleTextbox", "SimpleImage"]

gradio/_simple_templates/simpleimage.py

@@ -0,0 +1,106 @@
+"""gr.SimpleImage() component."""
+
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any
+
+from gradio_client.documentation import document, set_documentation_group
+
+from gradio.components.base import Component
+from gradio.data_classes import FileData
+from gradio.events import Events
+
+set_documentation_group("component")
+
+
+@document()
+class SimpleImage(Component):
+    """
+    Creates an image component that can be used to upload images (as an input) or display images (as an output).
+    Preprocessing: passes the uploaded image as a {str} filepath.
+    Postprocessing: expects a {str} or {pathlib.Path} filepath to an image and displays the image.
+    Examples-format: a {str} local filepath or URL to an image.
+    """
+
+    EVENTS = [
+        Events.clear,
+        Events.change,
+        Events.upload,
+    ]
+
+    data_model = FileData
+
+    def __init__(
+        self,
+        value: str | None = None,
+        *,
+        label: str | None = None,
+        every: float | None = None,
+        show_label: bool | None = None,
+        show_download_button: bool = True,
+        container: bool = True,
+        scale: int | None = None,
+        min_width: int = 160,
+        interactive: bool | None = None,
+        visible: bool = True,
+        elem_id: str | None = None,
+        elem_classes: list[str] | str | None = None,
+        render: bool = True,
+    ):
+        """
+        Parameters:
+            value: A path or URL for the default value that SimpleImage component is going to take. If callable, the function will be called whenever the app loads to set the initial value of the component.
+            label: The label for this component. Appears above the component and is also used as the header if there are a table of examples for this component. If None and used in a `gr.Interface`, the label will be the name of the parameter this component is assigned to.
+            every: If `value` is a callable, run the function 'every' number of seconds while the client connection is open. Has no effect otherwise. Queue must be enabled. The event can be accessed (e.g. to cancel it) via this component's .load_event attribute.
+            show_label: if True, will display label.
+            show_download_button: If True, will display button to download image.
+            container: If True, will place the component in a container - providing some extra padding around the border.
+            scale: relative width compared to adjacent Components in a Row. For example, if Component A has scale=2, and Component B has scale=1, A will be twice as wide as B. Should be an integer.
+            min_width: minimum pixel width, will wrap if not sufficient screen space to satisfy this value. If a certain scale value results in this Component being narrower than min_width, the min_width parameter will be respected first.
+            interactive: if True, will allow users to upload and edit an image; if False, can only be used to display images. If not provided, this is inferred based on whether the component is used as an input or output.
+            visible: If False, component will be hidden.
+            elem_id: An optional string that is assigned as the id of this component in the HTML DOM. Can be used for targeting CSS styles.
+            elem_classes: An optional list of strings that are assigned as the classes of this component in the HTML DOM. Can be used for targeting CSS styles.
+            render: If False, component will not render be rendered in the Blocks context. Should be used if the intention is to assign event listeners now but render the component later.
+        """
+        self.show_download_button = show_download_button
+        super().__init__(
+            label=label,
+            every=every,
+            show_label=show_label,
+            container=container,
+            scale=scale,
+            min_width=min_width,
+            interactive=interactive,
+            visible=visible,
+            elem_id=elem_id,
+            elem_classes=elem_classes,
+            render=render,
+            value=value,
+        )
+
+    def preprocess(self, payload: FileData | None) -> str | None:
+        """
+        Parameters:
+            payload: A FileData object containing the image data.
+        Returns:
+            A string containing the path to the image.
+        """
+        if payload is None:
+            return None
+        return payload.path
+
+    def postprocess(self, value: str | Path | None) -> FileData | None:
+        """
+        Parameters:
+            value: A string or pathlib.Path object containing the path to the image.
+        Returns:
+            A FileData object containing the image data.
+        """
+        if value is None:
+            return None
+        return FileData(path=str(value), orig_name=Path(value).name)
+
+    def example_inputs(self) -> Any:
+        return "https://raw.githubusercontent.com/gradio-app/gradio/main/test/test_files/bus.png"

gradio/cli/commands/components/_create_utils.py

@@ -287,17 +287,31 @@ def _replace_old_class_name(old_class_name: str, new_class_name: str, content: s
 def _create_backend(
     name: str, component: ComponentFiles, directory: Path, package_name: str
 ):
-    if component.template in gradio.components.__all__:
-        module = "components"
-    elif component.template in gradio.layouts.__all__:
-        module = "layouts"
-    elif component.template in gradio._simple_templates.__all__:  # type: ignore
-        module = "_simple_templates"
-    else:
+    def find_template_in_list(template, list_to_search):
+        for item in list_to_search:
+            if template.lower() == item.lower():
+                return item
+        return None
+
+    lists_to_search = [
+        (gradio.components.__all__, "components"),
+        (gradio.layouts.__all__, "layouts"),
+        (gradio._simple_templates.__all__, "_simple_templates"),  # type: ignore
+    ]
+
+    correct_cased_template = None
+    module = None
+
+    for list_, module_name in lists_to_search:
+        correct_cased_template = find_template_in_list(component.template, list_)
+        if correct_cased_template:
+            module = module_name
+            break
+
+    if not correct_cased_template:
         raise ValueError(
-            f"Cannot find {component.template} in gradio.components or gradio.layouts. "
-            "Please pass in a valid component name via the --template option. "
-            "It must match the name of the python class exactly."
+            f"Cannot find {component.template} in gradio.components, gradio.layouts, or gradio._simple_templates. "
+            "Please pass in a valid component name via the --template option. It must match the name of the python class."
         )
 
     readme_contents = textwrap.dedent(
@@ -327,7 +341,7 @@ def _create_backend(
     pyproject_contents = pyproject.read_text()
     pyproject_dest = directory / "pyproject.toml"
     pyproject_contents = pyproject_contents.replace("<<name>>", package_name).replace(
-        "<<template>>", PATTERN.format(template=component.template)
+        "<<template>>", PATTERN.format(template=correct_cased_template)
     )
     pyproject_dest.write_text(pyproject_contents)
 
@@ -358,6 +372,7 @@ def _create_backend(
 
     p = Path(inspect.getfile(gradio)).parent
     python_file = backend / f"{name.lower()}.py"
+    assert module is not None
 
     shutil.copy(
         str(p / module / component.python_file_name),
@@ -370,9 +385,11 @@ def _create_backend(
         shutil.copy(str(source_pyi_file), str(pyi_file))
 
     content = python_file.read_text()
-    python_file.write_text(_replace_old_class_name(component.template, name, content))
+    python_file.write_text(
+        _replace_old_class_name(correct_cased_template, name, content)
+    )
     if pyi_file.exists():
         pyi_content = pyi_file.read_text()
         pyi_file.write_text(
-            _replace_old_class_name(component.template, name, pyi_content)
+            _replace_old_class_name(correct_cased_template, name, pyi_content)
         )

guides/05_custom-components/01_custom-components-in-five-minutes.md

@@ -38,7 +38,7 @@ gradio cc create MyComponent --template SimpleTextbox
 Instead of `MyComponent`, give your component any name.
 
 Instead of `SimpleTextbox`, you can use any Gradio component as a template. `SimpleTextbox` is actually a special component that a stripped-down version of the `Textbox` component that makes it particularly useful when creating your first custom component.
-Some other components that are good if you are starting out: `SimpleDropdown` or `File`.
+Some other components that are good if you are starting out: `SimpleDropdown`, `SimpleImage`, or `File`.
 
 Tip: Run `gradio cc show` to get a list of available component templates.
 

js/app/build_plugins.ts

@@ -199,6 +199,7 @@ const ignore_list = [
 	"lite",
 	"preview",
 	"simpledropdown",
+	"simpleimage",
 	"simpletextbox",
 	"storybook",
 	"theme",

js/app/package.json

@@ -58,6 +58,7 @@
 		"@gradio/radio": "workspace:^",
 		"@gradio/row": "workspace:^",
 		"@gradio/simpledropdown": "workspace:^",
+		"@gradio/simpleimage": "workspace:^",
 		"@gradio/simpletextbox": "workspace:^",
 		"@gradio/slider": "workspace:^",
 		"@gradio/state": "workspace:^",

js/simpleimage/CHANGELOG.md

@@ -0,0 +1,2 @@
+# @gradio/simpleimage
+

js/simpleimage/Example.svelte

@@ -0,0 +1,44 @@
+<script lang="ts">
+	import type { FileData } from "@gradio/client";
+
+	export let value: null | FileData;
+	export let samples_dir: string;
+	export let type: "gallery" | "table";
+	export let selected = false;
+</script>
+
+<div
+	class="container"
+	class:table={type === "table"}
+	class:gallery={type === "gallery"}
+	class:selected
+>
+	<img src={samples_dir + value?.path} alt="" />
+</div>
+
+<style>
+	.container :global(img) {
+		width: 100%;
+		height: 100%;
+	}
+
+	.container.selected {
+		border-color: var(--border-color-accent);
+	}
+
+	.container.table {
+		margin: 0 auto;
+		border: 2px solid var(--border-color-primary);
+		border-radius: var(--radius-lg);
+		overflow: hidden;
+		width: var(--size-20);
+		height: var(--size-20);
+		object-fit: cover;
+	}
+
+	.container.gallery {
+		height: var(--size-20);
+		max-height: var(--size-20);
+		object-fit: cover;
+	}
+</style>

js/simpleimage/Index.svelte

@@ -0,0 +1,106 @@
+<svelte:options accessors={true} />
+
+<script context="module" lang="ts">
+	export { default as BaseImageUploader } from "./shared/ImageUploader.svelte";
+	export { default as BaseStaticImage } from "./shared/ImagePreview.svelte";
+	export { default as BaseExample } from "./Example.svelte";
+</script>
+
+<script lang="ts">
+	import type { Gradio } from "@gradio/utils";
+	import ImagePreview from "./shared/ImagePreview.svelte";
+	import ImageUploader from "./shared/ImageUploader.svelte";
+
+	import { Block, UploadText } from "@gradio/atoms";
+	import { StatusTracker } from "@gradio/statustracker";
+	import type { FileData } from "@gradio/client";
+	import type { LoadingStatus } from "@gradio/statustracker";
+	import { normalise_file } from "@gradio/client";
+
+	export let elem_id = "";
+	export let elem_classes: string[] = [];
+	export let visible = true;
+	export let value: null | FileData = null;
+	export let root: string;
+	export let proxy_url: null | string;
+	export let label: string;
+	export let show_label: boolean;
+	export let show_download_button: boolean;
+	export let container = true;
+	export let scale: number | null = null;
+	export let min_width: number | undefined = undefined;
+	export let loading_status: LoadingStatus;
+	export let interactive: boolean;
+
+	$: _value = normalise_file(value, root, proxy_url);
+
+	export let gradio: Gradio<{
+		change: never;
+		upload: never;
+		clear: never;
+	}>;
+
+	$: url = _value?.url;
+	$: url, gradio.dispatch("change");
+
+	let dragging: boolean;
+</script>
+
+{#if !interactive}
+	<Block
+		{visible}
+		variant={"solid"}
+		border_mode={dragging ? "focus" : "base"}
+		padding={false}
+		{elem_id}
+		{elem_classes}
+		allow_overflow={false}
+		{container}
+		{scale}
+		{min_width}
+	>
+		<StatusTracker
+			autoscroll={gradio.autoscroll}
+			i18n={gradio.i18n}
+			{...loading_status}
+		/>
+		<ImagePreview
+			value={_value}
+			{label}
+			{show_label}
+			{show_download_button}
+			i18n={gradio.i18n}
+		/>
+	</Block>
+{:else}
+	<Block
+		{visible}
+		variant={_value === null ? "dashed" : "solid"}
+		border_mode={dragging ? "focus" : "base"}
+		padding={false}
+		{elem_id}
+		{elem_classes}
+		allow_overflow={false}
+		{container}
+		{scale}
+		{min_width}
+	>
+		<StatusTracker
+			autoscroll={gradio.autoscroll}
+			i18n={gradio.i18n}
+			{...loading_status}
+		/>
+
+		<ImageUploader
+			bind:value
+			{root}
+			on:clear={() => gradio.dispatch("clear")}
+			on:drag={({ detail }) => (dragging = detail)}
+			on:upload={() => gradio.dispatch("upload")}
+			{label}
+			{show_label}
+		>
+			<UploadText i18n={gradio.i18n} type="image" />
+		</ImageUploader>
+	</Block>
+{/if}