silverstripe-reports/code/WidgetAreaEditor.php

<?php
/**
 * Special field type for selecting and configuring widgets on a page.
 * @package cms
 * @subpackage content
 */
class WidgetAreaEditor extends FormField {
	function FieldHolder() {
		Requirements::css(CMS_DIR . '/css/WidgetAreaEditor.css');
		Requirements::javascript(CMS_DIR . '/javascript/WidgetAreaEditor.js');

		return $this->renderWith("WidgetAreaEditor");
	}
	
	function AvailableWidgets() {
		$classes = ClassInfo::subclassesFor('Widget');
		array_shift($classes);
		$widgets= new DataObjectSet();
		
		foreach($classes as $class) {
			$widgets->push(singleton($class));
		}
		
		return $widgets;
	}
	
	function UsedWidgets() {
		$relationName = $this->name;
		$widgets = $this->form->getRecord()->getComponent($relationName)->Widgets();
		return $widgets;
	}
	
	function IdxField() {
		return $this->id() . 'ID';
	}
	
	function Value() {
		$relationName = $this->name;
		return $this->form->getRecord()->getComponent($relationName)->ID;
	}
	
	function saveInto(DataObject $record) {
		$name = $this->name;
		$idName = $name . "ID";
		
		$widgetarea = $record->getComponent($name);
		$widgetarea->write();
		
		$record->$idName = $widgetarea->ID;
		
		$widgets = $widgetarea->Widgets();
		
		// store the field IDs and delete the missing fields
		// alternatively, we could delete all the fields and re add them
		$missingWidgets = array();
		
		if($widgets) {
			foreach($widgets as $existingWidget) {
				$missingWidgets[$existingWidget->ID] = $existingWidget;
			}
		}
		
		// write the new widgets to the database
		if(isset($_REQUEST['Widget'])) {
			foreach(array_keys($_REQUEST['Widget']) as $newWidgetID) {
				$newWidgetData = $_REQUEST['Widget'][$newWidgetID];
				
				// Sometimes the id is "new-1" or similar, ensure this doesn't get into the query
				if(!is_numeric($newWidgetID)) {
					$newWidgetID = 0;
				}
				
				// \"ParentID\" = '0' is for the new page
		  		$widget = DataObject::get_one(
					'Widget',
					sprintf(
						'("ParentID" = %d OR "ParentID" = 0) AND "Widget"."ID" = %d',
						$record->$name()->ID,
						(int)$newWidgetID
					)
				);
		  		
		  		// check if we are updating an existing widget
				if($widget && isset($missingWidgets[$widget->ID])) {
		  			unset($missingWidgets[$widget->ID]);
				}
		  		
		  		// create a new object
		  		if(!$widget && !empty($newWidgetData['Type']) && class_exists($newWidgetData['Type'])) {
		  			$widget = new $newWidgetData['Type']();
		  			$widget->ID = 0;
		  			$widget->ParentID = $record->$name()->ID;
		  			
		  			if(!is_subclass_of($widget, 'Widget')) {
		  				$widget = null;
		  			}
		  		}
		  		
				if($widget) {
					if($widget->ParentID == 0) {
						$widget->ParentID = $record->$name()->ID;
					}
		
					$widget->populateFromPostData($newWidgetData);
				}
			}
		}
		
		// remove the fields not saved
		if($missingWidgets) {
			foreach($missingWidgets as $removedWidget) {
				if(isset($removedWidget) && is_numeric($removedWidget->ID)) $removedWidget->delete();
			}
		}
	}
}
?>