TimeSeries: Add an option to set legend width (#49126)

* Add an option to set legend width

* Add width to the cue file

* Use legendStyle

Co-authored-by: Zoltán Bedi <zoltan.bedi@gmail.com>

packages/grafana-schema/src/schema/mudball.cue

@@ -229,6 +229,7 @@ VizLegendOptions: {
 	isVisible?:   bool
   sortBy?:      string
   sortDesc?:    bool
+  width?:       number
 	calcs:        [...string]
 } @cuetsy(kind="interface")
 

packages/grafana-schema/src/schema/mudball.gen.ts

@@ -276,6 +276,7 @@ export interface VizLegendOptions {
   placement: LegendPlacement;
   sortBy?: string;
   sortDesc?: boolean;
+  width?: number;
 }
 
 export const defaultVizLegendOptions: Partial<VizLegendOptions> = {

packages/grafana-ui/src/components/VizLayout/VizLayout.tsx

@@ -68,6 +68,11 @@ export const VizLayout: VizLayoutComponentType = ({ width, height, legend, child
       if (legendMeasure) {
         size = { width: width - legendMeasure.width, height };
       }
+
+      if (legend.props.width) {
+        legendStyle.width = legend.props.width;
+        size = { width: width - legend.props.width, height };
+      }
       break;
   }
 
@@ -115,6 +120,7 @@ export interface VizLayoutLegendProps {
   children: React.ReactNode;
   maxHeight?: string;
   maxWidth?: string;
+  width?: number;
 }
 
 /**

packages/grafana-ui/src/options/builder/legend.tsx

@@ -36,6 +36,15 @@ export function addLegendOptions<T extends OptionsWithLegend>(
         ],
       },
       showIf: (c) => c.legend.displayMode !== LegendDisplayMode.Hidden,
+    })
+    .addNumberInput({
+      path: 'legend.width',
+      name: 'Width',
+      category: ['Legend'],
+      settings: {
+        placeholder: 'Auto',
+      },
+      showIf: (c) => c.legend.displayMode !== LegendDisplayMode.Hidden && c.legend.placement === 'right',
     });
 
   if (includeLegendCalcs) {