86 lines
2.9 KiB
Markdown
86 lines
2.9 KiB
Markdown
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# DisplaySet Service
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## Overview
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`DisplaySetService` handles converting the `instanceMetadata` into `DisplaySet` that `OHIF` uses for the visualization. `DisplaySetService` gets initialized in the `Mode.jsx`. During the initialization `SOPClassHandlerIds` of the `modes` gets registered with the `DisplaySetService`.
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> Based on the instanceMetadata's `SOPClassHandlerId`, the correct module from the registered extensions is found by `OHIF` and its `getDisplaySetsFromSeries` runs to create a DisplaySet for the Series.
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```js
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// platform/core/src/services/DisplaySetService/DisplaySetService.js
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init(extensionManager, SOPClassHandlerIds) {
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this.extensionManager = extensionManager;
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this.SOPClassHandlerIds = SOPClassHandlerIds;
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this.activeDisplaySets = [];
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}
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```
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in `Mode.jsx`
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```js
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// platform/viewer/src/routes/Mode/Mode.jsx
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export default function ModeRoute(/** ... **/) {
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/** ... **/
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const { DisplaySetService } = servicesManager.services
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const { sopClassHandlers } = mode
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/** ... **/
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useEffect(
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() => {
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/** ... **/
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// Add SOPClassHandlers to a new SOPClassManager.
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DisplaySetService.init(extensionManager, sopClassHandlers)
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/** ... **/
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}
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/** ... **/
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)
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/** ... **/
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return <> /** ... **/ </>
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}
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```
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## Events
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There are three events that get broadcasted in `DisplaySetService`:
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| Event | Description |
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| -------------------- | ---------------------------------------------------- |
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| DISPLAY_SETS_ADDED | Fires a displayset is added to the displaysets cache |
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| DISPLAY_SETS_CHANGED | Fires when a displayset is changed |
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| DISPLAY_SETS_REMOVED | Fires when a displayset is removed |
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## API
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Let's find out about the public API for `DisplaySetService`.
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- `EVENTS`: Object including the events mentioned above. You can subscribe to these events
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by calling DisplaySetService.subscribe(EVENTS.DISPLAY_SETS_CHANGED, myFunction). [Read more about pub/sub pattern here](../pubsub.md)
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- `makeDisplaySets(input, { batch, madeInClient, settings } = {}`): Creates displaySet for the provided
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array of instances metadata. Each display set gets a random UID assigned.
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- `input`: Array of instances Metadata
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- `batch = false`: If you need to pass array of arrays of instances metadata to have a batch creation
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- `madeInClient = false`: Disables the events firing
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- `settings = {}`: Hanging protocol viewport or rendering settings. For instance, setting the initial `voi`, or activating a tool upon
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displaySet rendering. [Read more about hanging protocols settings here](./HangingProtocolService.md#Settings)
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- `getDisplaySetByUID`: Returns the displaySet based on the DisplaySetUID.
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- `getDisplaySetForSOPInstanceUID`: Returns the displaySet that includes an image with the provided SOPInstanceUID
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- `getActiveDisplaySets`: Returns the active displaySets
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- `deleteDisplaySet`: Deletes the displaySets from the displaySets cache
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