fix: Date Column editing issue.

docs: add some examples.

lib/ui/grid/column.js

@@ -131,6 +131,10 @@ export class GridColumn {
      * @virtual
      */
 
+    /**
+     * 复写 [toString]{@linkcode String#toString} 方法
+     * @private
+     */
     static toString() { return '[object Column]' }
 }
 
@@ -417,6 +421,8 @@ export class GridIconColumn extends GridColumn {
 }
 
 export class GridDateColumn extends GridColumn {
+    static get editing() { return true };
+
     static createEdit(trigger, col, _container, vals) {
         let enabled = col.enabled;
         if (typeof enabled === 'string') {
@@ -428,7 +434,15 @@ export class GridDateColumn extends GridColumn {
             return super.create();
         }
         const date = createDateInput(col.dateMin, col.dateMax);
-        // date.addEventListener('change', trigger);
+        date.addEventListener('change', () => {
+            if (vals.__editing == null) {
+                vals.__editing = {
+                    [col.key]: true
+                }
+            } else {
+                vals.__editing[col.key] = true;
+            }
+        });
         date.addEventListener('blur', trigger);
         return date;
     }