Fix #11447: Dashboard var attribute

docs/14_0_0/components/dashboard.md

@@ -29,6 +29,7 @@ Dashboard provides a portal like layout with drag&drop based reorder capabilitie
 | responsive | false | Boolean | In responsive mode, allows use of PrimeFlex CSS to control widget sizes and responsiveness.
 | style | null | String | Inline style of the dashboard container
 | styleClass | null | String | Style class of the dashboard container
+| var | null | String | Name of collection iterator which will be the value of DashboardWidget.getValue().
 
 ## Getting started with Dashboard
 Dashboard is backed by a DashboardModel and consists of panel components.
@@ -84,7 +85,36 @@ public class Bean {
     public Bean() {
         responsiveModel = new DefaultDashboardModel();
         responsiveModel.addWidget(new DefaultDashboardWidget("bar", "col-12 lg:col-6 xl:col-4"));
-        responsiveModel.addColumn(new DefaultDashboardWidget("stacked", "col-12 lg:col-6 xl:col-8"));
+        responsiveModel.addWidget(new DefaultDashboardWidget("stacked", "col-12 lg:col-6 xl:col-8"));
+    }
+}
+```
+
+## Dynamic
+Dashboard can be dynamic using `var="widget"` mode to allow dynamic panels.  The `value` must be set in your
+DashboardWidget model.
+
+```xhtml
+<p:dashboard model="#{bean.model}" var="dash">
+    <p:panel id="bar" rendered="#{dash.visible}">
+        #{dash.name} 
+    </p:panel>
+    <p:panel id="stacked" rendered="#{dash.visible}">
+        #{dash.name} 
+    </p:panel>
+    //more panels like lifestyle, weather, politics...
+</p:dashboard>
+```
+Dashboard model in this mode wants `one` widget per column and you can pass an `Object` value to put put in the `var` context.
+
+```java
+public class Bean {
+    private DashboardModel model;
+
+    public Bean() {
+        responsiveModel = new DefaultDashboardModel();
+        responsiveModel.addWidget(new DefaultDashboardWidget("bar", "col-12 lg:col-6 xl:col-4", yourObject1));
+        responsiveModel.addWidget(new DefaultDashboardWidget("stacked", "col-12 lg:col-6 xl:col-8", yourObject2));
     }
 }
 ```

docs/14_0_0/gettingstarted/whatsnew.md

@@ -44,6 +44,9 @@ Look into [migration guide](https://primefaces.github.io/primefaces/14_0_0/#/../
     * Added `filterPlaceholder` for `Column` and `Columns`
     * Added `rowData` to `CellEditEvent` which contains the entire row from the cell being edited.
 
+* Dashboard
+    * Added `var` to allow dynamic panels in `DashboardWidget.setValue(obj)` per panel
+
 * Messages
     * Added `clearMessages` widget method to clear all current messages.
 

primefaces/src/main/java/org/primefaces/component/dashboard/DashboardBase.java

@@ -43,7 +43,8 @@ public enum PropertyKeys {
         reordering,
         style,
         styleClass,
-        responsive
+        responsive,
+        var
     }
 
     public DashboardBase() {
@@ -110,4 +111,12 @@ public boolean isResponsive() {
     public void setResponsive(boolean responsive) {
         getStateHelper().put(PropertyKeys.responsive, responsive);
     }
+
+    public String getVar() {
+        return (String) getStateHelper().eval(PropertyKeys.var, null);
+    }
+
+    public void setVar(String var) {
+        getStateHelper().put(PropertyKeys.var, var);
+    }
 }

primefaces/src/main/java/org/primefaces/component/dashboard/DashboardRenderer.java

@@ -26,6 +26,7 @@
 import java.io.IOException;
 import java.util.List;
 
+import javax.faces.FacesException;
 import javax.faces.component.UIComponent;
 import javax.faces.context.FacesContext;
 import javax.faces.context.ResponseWriter;
@@ -35,6 +36,7 @@
 import org.primefaces.model.dashboard.DashboardModel;
 import org.primefaces.model.dashboard.DashboardWidget;
 import org.primefaces.renderkit.CoreRenderer;
+import org.primefaces.util.ComponentUtils;
 import org.primefaces.util.GridLayoutUtils;
 import org.primefaces.util.WidgetBuilder;
 
@@ -57,6 +59,7 @@ protected void encodeMarkup(FacesContext context, Dashboard dashboard) throws IO
         ResponseWriter writer = context.getResponseWriter();
         String clientId = dashboard.getClientId(context);
         boolean responsive = dashboard.isResponsive();
+        String var = dashboard.getVar();
 
         writer.startElement("div", dashboard);
         writer.writeAttribute("id", clientId, "id");
@@ -92,7 +95,14 @@ protected void encodeMarkup(FacesContext context, Dashboard dashboard) throws IO
                 for (String widgetId : column.getWidgets()) {
                     Panel widget = (Panel) SearchExpressionUtils.contextlessResolveComponent(context, dashboard, widgetId);
                     if (widget != null) {
-                        renderChild(context, widget);
+                        ComponentUtils.executeInRequestScope(context, var, column.getValue(), () -> {
+                            try {
+                                return renderChild(context, widget);
+                            }
+                            catch (IOException e) {
+                                throw new FacesException(e);
+                            }
+                        });
                     }
                 }
 

primefaces/src/main/java/org/primefaces/model/dashboard/DashboardWidget.java

@@ -48,4 +48,8 @@ public interface DashboardWidget {
     void setStyle(String style);
 
     void setStyleClass(String styleClass);
+
+    Object getValue();
+
+    void setValue(Object value);
 }

primefaces/src/main/java/org/primefaces/model/dashboard/DefaultDashboardWidget.java

@@ -39,22 +39,35 @@ public class DefaultDashboardWidget implements DashboardWidget, Serializable {
     private List<String> widgets;
     private String style;
     private String styleClass;
+    private Object value;
 
     public DefaultDashboardWidget() {
         widgets = new LinkedList<>();
     }
 
-    public DefaultDashboardWidget(String widgetId, String styleClass) {
+    public DefaultDashboardWidget(String style, String styleClass, Object value, Collection<String> widgets) {
+        this();
+        this.widgets.addAll(widgets);
+        this.style = style;
+        this.styleClass = styleClass;
+        this.value = value;
+    }
+
+    public DefaultDashboardWidget(String style, String styleClass, Collection<String> widgets) {
+        this(style, styleClass, null, widgets);
+    }
+
+    public DefaultDashboardWidget(String widgetId, String styleClass, Object value) {
         this();
         getWidgets().addAll(Arrays.asList(widgetId));
         setStyleClass(styleClass);
+        setValue(value);
     }
 
-    public DefaultDashboardWidget(String style, String styleClass, Collection<String> widgets) {
+    public DefaultDashboardWidget(String widgetId, String styleClass) {
         this();
-        this.widgets.addAll(widgets);
-        this.style = style;
-        this.styleClass = styleClass;
+        getWidgets().addAll(Arrays.asList(widgetId));
+        setStyleClass(styleClass);
     }
 
     public DefaultDashboardWidget(Collection<String> widgets) {
@@ -118,4 +131,14 @@ public void setStyleClass(String styleClass) {
         this.styleClass = styleClass;
     }
 
+    @Override
+    public Object getValue() {
+        return value;
+    }
+
+    @Override
+    public void setValue(Object value) {
+        this.value = value;
+    }
+
 }

primefaces/src/main/java/org/primefaces/renderkit/CoreRenderer.java

@@ -70,9 +70,9 @@ protected void renderChildren(FacesContext context, UIComponent component) throw
         }
     }
 
-    protected void renderChild(FacesContext context, UIComponent child) throws IOException {
+    protected UIComponent renderChild(FacesContext context, UIComponent child) throws IOException {
         if (!child.isRendered()) {
-            return;
+            return child;
         }
 
         child.encodeBegin(context);
@@ -84,6 +84,7 @@ protected void renderChild(FacesContext context, UIComponent child) throws IOExc
             renderChildren(context, child);
         }
         child.encodeEnd(context);
+        return child;
     }
 
     protected String getResourceURL(FacesContext context, String value) {

primefaces/src/main/java/org/primefaces/util/ComponentUtils.java

@@ -689,6 +689,11 @@ public static String encodeComponent(UIComponent component, FacesContext context
     }
 
     public static <T> T executeInRequestScope(FacesContext context, String var, Object value, Supplier<T> callback) {
+        // if no var passed just execute the callback
+        if (LangUtils.isBlank(var)) {
+            return callback.get();
+        }
+
         Map<String, Object> requestMap = context.getExternalContext().getRequestMap();
 
         Object oldValue = requestMap.remove(var);

primefaces/src/main/resources/META-INF/primefaces-p.taglib.xml

@@ -7696,6 +7696,14 @@
             <required>false</required>
             <type>java.lang.Boolean</type>
         </attribute>
+        <attribute>
+            <description>
+                <![CDATA[Name of collection iterator which will be the value of DashboardWidget.getValue().]]>
+            </description>
+            <name>var</name>
+            <required>false</required>
+            <type>java.lang.String</type>
+        </attribute>
     </tag>
     <tag>
         <description>