feat(piecewise): selecedtMode support boolean (#16972)

* feat(piecewise): `selecedtMode` support `boolean`

* lint: code style

Author: susiwen8

src/component/visualMap/PiecewiseModel.ts

@@ -104,7 +104,7 @@ export interface PiecewiseVisualMapOption extends VisualMapOption {
      * When categories: {'cate1': false, 'cate3': true} When selected === false, means all unselected.
      */
     selected?: Dictionary<boolean>
-    selectedMode?: 'multiple' | 'single'
+    selectedMode?: 'multiple' | 'single' | boolean
 
     /**
      * By default, when text is used, label will hide (the logic

src/component/visualMap/PiecewiseView.ts

@@ -215,10 +215,14 @@ class PiecewiseVisualMapView extends VisualMapView {
     ) {
         const visualMapModel = this.visualMapModel;
         const option = visualMapModel.option;
+        const selectedMode = option.selectedMode;
+        if (!selectedMode) {
+            return;
+        }
         const selected = zrUtil.clone(option.selected);
         const newKey = visualMapModel.getSelectedMapKey(piece);
 
-        if (option.selectedMode === 'single') {
+        if (selectedMode === 'single' || selectedMode === true) {
             selected[newKey] = true;
             zrUtil.each(selected, function (o, key) {
                 selected[key] = key === newKey;