Panel Customization - Svelte

This guide shows you how to control CE.SDK’s UI panels programmatically, allowing you to show, hide, position, and configure panels like the inspector, asset library, and settings. You’ll learn how to use the Panel API to customize panel behavior for your specific user interface requirements.

Panel Customization example showing CE.SDK with inspector and asset library panels

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import type {
  EditorPlugin,
  EditorPluginContext,
  PanelPosition
} from '@cesdk/cesdk-js';
import packageJson from './package.json';

/**
 * Panel Customization Example
 *
 * This example demonstrates how to use CE.SDK's Panel API to:
 * - Show and hide panels programmatically
 * - Position panels (left/right)
 * - Make panels float or dock
 * - Check panel state
 * - Find panels by criteria
 * - Configure panel payloads
 */
class Example implements EditorPlugin {
  name = packageJson.name;
  version = packageJson.version;

  async initialize({ cesdk }: EditorPluginContext): Promise<void> {
    if (!cesdk) {
      throw new Error('CE.SDK instance is required for this plugin');
    }

    // Enable panel features through Feature API
    cesdk.feature.enable('ly.img.inspector', () => true);
    cesdk.feature.enable('ly.img.library.panel', () => true);
    cesdk.feature.enable('ly.img.settings', () => true);

    // Load assets and create scene
    await cesdk.addDefaultAssetSources();
    await cesdk.addDemoAssetSources({
      sceneMode: 'Design',
      withUploadAssetSources: true
    });
    await cesdk.createDesignScene();

    const engine = cesdk.engine;
    const page = engine.block.findByType('page')[0];

    // Configure default panel positioning
    cesdk.ui.setPanelPosition(
      '//ly.img.panel/inspector',
      'left' as PanelPosition
    );
    cesdk.ui.setPanelFloating('//ly.img.panel/inspector', false);
    cesdk.ui.setPanelPosition(
      '//ly.img.panel/assetLibrary',
      'left' as PanelPosition
    );

    // Check if a panel is open before opening
    if (!cesdk.ui.isPanelOpen('//ly.img.panel/inspector')) {
      console.log('Inspector is not open yet');
    }

    // Open inspector panel with default settings
    cesdk.ui.openPanel('//ly.img.panel/inspector');

    // Add an image to demonstrate replace library functionality
    const image = await engine.asset.defaultApplyAsset({
      id: 'ly.img.cesdk.images.samples/sample.1',
      meta: {
        uri: 'https://cdn.img.ly/assets/demo/v1/ly.img.image/images/sample_1.jpg',
        width: 2500,
        height: 1667
      }
    });

    if (image) {
      // Position the image in the center of the page
      const pageWidth = engine.block.getWidth(page);
      const pageHeight = engine.block.getHeight(page);
      const imageWidth = engine.block.getWidth(image);
      const imageHeight = engine.block.getHeight(image);

      engine.block.setPositionX(image, (pageWidth - imageWidth) / 2);
      engine.block.setPositionY(image, (pageHeight - imageHeight) / 2);

      // Select the image
      engine.block.setSelected(image, true);

      // Open replace library with custom options
      // This panel will float and be positioned on the right
      cesdk.ui.openPanel('//ly.img.panel/assetLibrary.replace', {
        position: 'right' as PanelPosition,
        floating: true,
        closableByUser: true
      });

      // Find all currently open panels
      const openPanels = cesdk.ui.findAllPanels({ open: true });
      console.log('Currently open panels:', openPanels);

      // Find all panels on the left
      const leftPanels = cesdk.ui.findAllPanels({
        position: 'left' as PanelPosition
      });
      console.log('Panels on the left:', leftPanels);

      // Get panel position and floating state
      const inspectorPosition = cesdk.ui.getPanelPosition(
        '//ly.img.panel/inspector'
      );
      const inspectorFloating = cesdk.ui.getPanelFloating(
        '//ly.img.panel/inspector'
      );
      console.log(
        `Inspector is on the ${inspectorPosition} side, floating: ${inspectorFloating}`
      );

      // Demonstrate responsive panel behavior
      const updatePanelLayout = () => {
        const isNarrowViewport = window.innerWidth < 768;

        // Float panels on narrow viewports
        cesdk.ui.setPanelFloating('//ly.img.panel/inspector', isNarrowViewport);

        // Adjust positioning based on available space
        if (!isNarrowViewport && window.innerWidth > 1200) {
          cesdk.ui.setPanelPosition(
            '//ly.img.panel/inspector',
            'right' as PanelPosition
          );
        } else if (!isNarrowViewport) {
          cesdk.ui.setPanelPosition(
            '//ly.img.panel/inspector',
            'left' as PanelPosition
          );
        }
      };

      // Apply responsive layout
      updatePanelLayout();

      // Update on window resize
      window.addEventListener('resize', updatePanelLayout);

      if (cesdk.ui.isPanelOpen('//ly.img.panel/assetLibrary.replace')) {
        cesdk.ui.closePanel('//ly.img.panel/assetLibrary.replace');
      }

      cesdk.ui.openPanel('//ly.img.panel/assetLibrary', {
        payload: {
          title: 'Custom Media Library',
          entries: ['ly.img.image', 'ly.img.video', 'ly.img.upload']
        }
      });

      // Example: Close all ly.img panels using wildcard
      // Uncomment to test:
      // setTimeout(() => {
      //   console.log('Closing all ly.img panels...');
      //   cesdk.ui.closePanel('//ly.img.*');
      // }, 10000);
    }
  }
}

export default Example;

This guide demonstrates CE.SDK’s Panel API through a working example that shows how to control panels programmatically, including opening, closing, positioning, and configuring panel behavior.

Understanding CE.SDK Panels#

Panels are reusable UI components in CE.SDK that provide different editing and configuration capabilities. Each panel has a unique ID and can be positioned on the left or right side of the canvas (or bottom on mobile viewports). The Panel API gives you programmatic control over when and how these panels appear.

Available Default Panels#

CE.SDK provides several built-in panels:

//ly.img.panel/inspector - Displays properties and editing controls for the currently selected block
//ly.img.panel/assetLibrary - Main asset library panel for inserting new content into your design
//ly.img.panel/assetLibrary.replace - Replacement library for swapping the content of the selected block
//ly.img.panel/settings - Settings panel for customizing the editor during runtime

These panels must be enabled through the Feature API before they can be used:

// Enable panel features through Feature API
cesdk.feature.enable('ly.img.inspector', () => true);
cesdk.feature.enable('ly.img.library.panel', () => true);
cesdk.feature.enable('ly.img.settings', () => true);

Opening and Closing Panels#

The Panel API provides methods to open and close panels programmatically, giving you control over the user’s interface workflow.

Opening Panels#

Use cesdk.ui.openPanel() to display a panel. The panel will only open if it exists, is registered, and isn’t already open:

// Open inspector panel with default settings
cesdk.ui.openPanel('//ly.img.panel/inspector');

You can override the panel’s default position and floating behavior with options:

// Open replace library with custom options
// This panel will float and be positioned on the right
cesdk.ui.openPanel('//ly.img.panel/assetLibrary.replace', {
  position: 'right' as PanelPosition,
  floating: true,
  closableByUser: true
});

The options parameter accepts:

position: 'left' or 'right' - Override the default panel position
floating: boolean - Override whether the panel floats over the canvas
closableByUser: boolean - Control if users can close the panel
payload: object - Pass data to the panel (see Panel Payloads section)

Closing Panels#

Use cesdk.ui.closePanel() to hide panels. This method supports both exact panel IDs and wildcard patterns:

if (cesdk.ui.isPanelOpen('//ly.img.panel/assetLibrary.replace')) {
  cesdk.ui.closePanel('//ly.img.panel/assetLibrary.replace');
}

You can also use wildcard patterns to close multiple panels at once:

//   cesdk.ui.closePanel('//ly.img.*');

Wildcard patterns are useful for cleaning up multiple panels at once or closing all panels from a specific namespace.

Checking Panel State#

Before opening or manipulating panels, you can check their current state using cesdk.ui.isPanelOpen():

// Check if a panel is open before opening
if (!cesdk.ui.isPanelOpen('//ly.img.panel/inspector')) {
  console.log('Inspector is not open yet');
}

Finding Panels#

To discover all available panels or filter panels by their state, use cesdk.ui.findAllPanels():

// Find all currently open panels
const openPanels = cesdk.ui.findAllPanels({ open: true });
console.log('Currently open panels:', openPanels);

// Find all panels on the left
const leftPanels = cesdk.ui.findAllPanels({
  position: 'left' as PanelPosition
});
console.log('Panels on the left:', leftPanels);

This method is particularly useful for debugging or building custom UI that needs to reflect the current panel state.

Positioning Panels#

Panels can be positioned on the left or right side of the canvas. Use cesdk.ui.setPanelPosition() to set the default position:

// Position inspector on the left
cesdk.ui.setPanelPosition('//ly.img.panel/inspector', 'left');

// Position asset library on the right
cesdk.ui.setPanelPosition('//ly.img.panel/assetLibrary', 'right');

You can also use a function for dynamic positioning:

// Position based on viewport width
cesdk.ui.setPanelPosition('//ly.img.panel/inspector', () => {
  const viewportWidth = window.innerWidth;
  return viewportWidth > 1200 ? 'right' : 'left';
});

To get the current position and floating state of a panel:

// Get panel position and floating state
const inspectorPosition = cesdk.ui.getPanelPosition(
  '//ly.img.panel/inspector'
);
const inspectorFloating = cesdk.ui.getPanelFloating(
  '//ly.img.panel/inspector'
);
console.log(
  `Inspector is on the ${inspectorPosition} side, floating: ${inspectorFloating}`
);

Note that setting the position affects both the default behavior and currently open panels, unless the panel was opened with an explicit position option.

Floating Panels#

Panels can either float over the canvas (potentially obscuring content) or dock beside it. Floating is useful for compact layouts or temporary panels.

Making Panels Float#

Use cesdk.ui.setPanelFloating() to control floating behavior:

// Make inspector float over the canvas
cesdk.ui.setPanelFloating('//ly.img.panel/inspector', true);

// Dock asset library beside the canvas
cesdk.ui.setPanelFloating('//ly.img.panel/assetLibrary', false);

Like positioning, you can use a function for responsive floating:

// Float on narrow viewports, dock on wide
cesdk.ui.setPanelFloating('//ly.img.panel/inspector', () => {
  return window.innerWidth < 768;
});

Checking Floating State#

To check if a panel is currently floating:

const isFloating = cesdk.ui.getPanelFloating('//ly.img.panel/inspector');
if (isFloating) {
  console.log('Inspector is floating over the canvas');
} else {
  console.log('Inspector is docked beside the canvas');
}

Panel Payloads#

Some panels accept a payload object that determines their content and behavior. The asset library panel is the most common example:

cesdk.ui.openPanel('//ly.img.panel/assetLibrary', {
  payload: {
    title: 'Custom Media Library',
    entries: ['ly.img.image', 'ly.img.video', 'ly.img.upload']
  }
});

The asset library payload accepts:

title: string | string[] - Panel title, or breadcrumb navigation if an array
entries: string[] - Array of asset library entry IDs to display

Custom panels registered through plugins can define their own payload types.

Common Workflows#

Here are practical examples combining Panel API methods for common use cases.

Conditional Panel Opening#

Check if a panel is open before opening it to avoid unnecessary operations:

// Only open inspector if it's not already visible
if (!cesdk.ui.isPanelOpen('//ly.img.panel/inspector')) {
  cesdk.ui.openPanel('//ly.img.panel/inspector', {
    position: 'left',
    floating: false
  });
}

Asset Selection with Replace Library#

Open the replace library for users to swap content of the selected block:

// Create scene and add an image
await cesdk.createDesignScene();
await cesdk.addDefaultAssetSources();
await cesdk.addDemoAssetSources({ sceneMode: 'Design' });

const engine = cesdk.engine;
const image = await engine.asset.defaultApplyAsset({
  id: 'ly.img.cesdk.images.samples/sample.1',
  meta: {
    uri: 'https://cdn.img.ly/assets/demo/v1/ly.img.image/images/sample_1.jpg',
    width: 2500,
    height: 1667
  }
});

if (image) {
  // Select the image
  engine.block.setSelected(image, true);

  // Open replace library if not already open
  if (!cesdk.ui.isPanelOpen('//ly.img.panel/assetLibrary.replace')) {
    cesdk.ui.openPanel('//ly.img.panel/assetLibrary.replace', {
      position: 'right',
      floating: false
    });
  }
}

Feature API Integration#

The Panel API works with the Feature API to control panel availability and behavior.

Enabling Panel Features#

Before using panels, enable their features:

// Enable inspector feature
cesdk.feature.enable('ly.img.inspector', () => true);

// Enable asset library feature
cesdk.feature.enable('ly.img.library.panel', () => true);

// Enable settings feature
cesdk.feature.enable('ly.img.settings', () => true);

// Check if a feature is enabled
const isInspectorEnabled = cesdk.feature.isEnabled('ly.img.inspector', {
  engine: cesdk.engine
});

Troubleshooting#

Panel Not Opening#

Problem: Calling openPanel() does nothing.

Solutions:

Verify the panel ID is correct using findAllPanels()
Check that the panel’s feature is enabled via Feature API
Ensure the panel isn’t already open with isPanelOpen()
Confirm the panel is registered and exists in the system

// Debug panel availability
const allPanels = cesdk.ui.findAllPanels();
console.log('Available panels:', allPanels);

const isEnabled = cesdk.feature.isEnabled('ly.img.inspector', {
  engine: cesdk.engine
});
console.log('Inspector feature enabled:', isEnabled);

Position or Floating Settings Not Applied#

Problem: Panel appears in unexpected position or floating state.

Solutions:

Check if the panel was opened with explicit position or floating options that override defaults
Call setPanelPosition() or setPanelFloating() before opening the panel
Remember that session options in openPanel() take precedence over default settings

// Set defaults first
cesdk.ui.setPanelPosition('//ly.img.panel/inspector', 'left');
cesdk.ui.setPanelFloating('//ly.img.panel/inspector', false);

// Then open without overriding options
cesdk.ui.openPanel('//ly.img.panel/inspector');

Replace Library Shows Nothing#

Problem: Opening //ly.img.panel/assetLibrary.replace displays an empty panel.

Solutions:

Ensure a block is selected before opening the replace library
Verify the selected block has asset replacement configured
Check that relevant asset library entries are set up in your asset sources

// Ensure a block is selected
const selectedBlocks = cesdk.engine.block.findAllSelected();
if (selectedBlocks.length === 0) {
  console.warn('No block selected - replace library will be empty');
}

Panels Overlap on Mobile#

Problem: Multiple panels overlap on narrow viewports.

Solutions:

Close unnecessary panels before opening new ones
Use findAllPanels({ open: true }) to check currently open panels
Make panels floating on mobile to save space
Implement responsive panel management (see Responsive Panel Layout workflow)

// Close all panels before opening one on mobile
if (window.innerWidth < 768) {
  cesdk.ui.closePanel('//ly.img.*');
}
cesdk.ui.openPanel('//ly.img.panel/inspector', { floating: true });

API Reference#

Method	Parameters	Returns	Purpose
`cesdk.ui.openPanel()`	`panelId: string` `options?: { position?, floating?, closableByUser?, payload? }`	`void`	Opens a panel with optional configuration override
`cesdk.ui.closePanel()`	`panelId: string`	`void`	Closes panels matching ID or wildcard pattern
`cesdk.ui.isPanelOpen()`	`panelId: string` `options?: { position?, floating?, payload? }`	`boolean`	Checks if panel is open with optional criteria matching
`cesdk.ui.findAllPanels()`	`options?: { open?, position?, floating?, payload? }`	`string[]`	Returns panel IDs matching specified criteria
`cesdk.ui.setPanelPosition()`	`panelId: string` `position: 'left' \| 'right' \| (() => PanelPosition)`	`void`	Sets default panel position
`cesdk.ui.getPanelPosition()`	`panelId: string`	`'left' \| 'right'`	Returns current panel position
`cesdk.ui.setPanelFloating()`	`panelId: string` `floating: boolean \| (() => boolean)`	`void`	Sets whether panel floats over canvas
`cesdk.ui.getPanelFloating()`	`panelId: string`	`boolean`	Returns whether panel is floating

Next Steps#

Create Custom Panels - Learn how to register your own custom panels
Asset Library - Configure which assets appear in library panels
Inspector Bar - Customize the inspector bar for editing properties