Merge pull request #347 from jonah-iden/jiden/zoomScale-centerAction

added zoomScale property to centerAction to set zoom level when executing the action

Author: dhuebner

packages/sprotty-protocol/src/actions.ts

@@ -463,16 +463,18 @@ export interface CenterAction extends Action {
     elementIds: string[]
     animate: boolean
     retainZoom: boolean
+    zoomScale?: number
 }
 export namespace CenterAction {
     export const KIND = 'center';
 
-    export function create(elementIds: string[], options: { animate?: boolean, retainZoom?: boolean } = {}): CenterAction {
+    export function create(elementIds: string[], options: { animate?: boolean, retainZoom?: boolean, zoomScale?: number } = {}): CenterAction {
         return {
             kind: KIND,
             elementIds,
             animate: options.animate ?? true,
-            retainZoom: options.retainZoom ?? false
+            retainZoom: options.retainZoom ?? false,
+            zoomScale: options.zoomScale
         };
     }
 }

packages/sprotty/src/features/viewport/center-fit.ts

@@ -44,7 +44,8 @@ export class CenterAction implements Action, ProtocolCenterAction {
 
     constructor(public readonly elementIds: string[],
                 public readonly animate: boolean = true,
-                public readonly retainZoom: boolean = false) {
+                public readonly retainZoom: boolean = false,
+                public readonly zoomScale?: number) {
     }
 }
 
@@ -177,7 +178,12 @@ export class CenterCommand extends BoundsAwareViewportCommand {
         if (!Dimension.isValid(model.canvasBounds)) {
             return undefined;
         }
-        const zoom = (this.action.retainZoom && isViewport(model)) ? model.zoom : 1;
+        let zoom = 1;
+        if (this.action.retainZoom && isViewport(model)) {
+            zoom = model.zoom;
+        } else if (this.action.zoomScale) {
+            zoom = this.action.zoomScale;
+        }
         const c = Bounds.center(bounds);
         return {
             scroll: {