Add context selector for workflow (joomla#104)

administrator/components/com_content/src/Extension/ContentComponent.php

@@ -177,6 +177,24 @@ public function getContexts(): array
 		return $contexts;
 	}
 
+	/**
+	 * Returns valid contexts
+	 *
+	 * @return  array
+	 *
+	 * @since   4.0.0
+	 */
+	public function getWorkflowContexts(): array
+	{
+		Factory::getLanguage()->load('com_content', JPATH_ADMINISTRATOR);
+
+		$contexts = array(
+			'com_content.article'    => Text::_('COM_CONTENT')
+		);
+
+		return $contexts;
+	}
+
 	/**
 	 * Returns the table for the count items functions for the given section.
 	 *

administrator/components/com_workflow/forms/filter_workflows.xml

@@ -1,5 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<form>
+<form addfieldprefix="Joomla\Component\Workflow\Administrator\Field">
+	<fieldset name="group">
+		<field
+			name="extension"
+			type="workflowcontexts"
+			filtermode="selector"
+			onchange="this.form.submit();"
+		/>
+	</fieldset>
 	<fields name="filter">
 		<field
 			name="search"

administrator/components/com_workflow/src/Field/WorkflowcontextsField.php

@@ -0,0 +1,70 @@
+<?php
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  com_workflow
+ *
+ * @copyright   Copyright (C) 2005 - 2020 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\Component\Workflow\Administrator\Field;
+
+\defined('_JEXEC') or die;
+
+use Joomla\CMS\Factory;
+use Joomla\CMS\Workflow\WorkflowServiceInterface;
+use Joomla\CMS\Form\Field\ListField;
+
+/**
+ * Fields Contexts
+ *
+ * @since  4.0.0
+ */
+class WorkflowcontextsField extends ListField
+{
+	/**
+	 * Type of the field
+	 *
+	 * @var    string
+	 */
+	public $type = 'Workflowcontexts';
+
+	/**
+	 * Method to get the field input markup for a generic list.
+	 * Use the multiple attribute to enable multiselect.
+	 *
+	 * @return  string  The field input markup.
+	 *
+	 * @since   4.0.0
+	 */
+	protected function getInput()
+	{
+		if (count($this->getOptions()) < 2)
+		{
+			$this->layout = 'joomla.form.field.hidden';
+		}
+
+		return parent::getInput();
+	}
+
+	/**
+	 * Method to get the field options.
+	 *
+	 * @return  array  The field option objects.
+	 *
+	 * @since   4.0.0
+	 */
+	protected function getOptions()
+	{
+		$parts = explode('.', $this->value);
+
+		$component = Factory::getApplication()->bootComponent($parts[0]);
+
+		if ($component instanceof WorkflowServiceInterface)
+		{
+			return $component->getWorkflowContexts();
+		}
+
+		return [];
+	}
+}

administrator/components/com_workflow/src/Model/WorkflowsModel.php

@@ -116,6 +116,28 @@ public function getItems()
 		return $items;
 	}
 
+	/**
+	 * Get the filter form
+	 *
+	 * @param   array    $data      data
+	 * @param   boolean  $loadData  load current data
+	 *
+	 * @return  \JForm|false  the JForm object or false
+	 *
+	 * @since   4.0.0
+	 */
+	public function getFilterForm($data = array(), $loadData = true)
+	{
+		$form = parent::getFilterForm($data, $loadData);
+
+		if ($form)
+		{
+			$form->setValue('extension', null, $this->getState('filter.extension'));
+		}
+
+		return $form;
+	}
+
 	/**
 	 * Add the number of transitions and states to all workflow items
 	 *

administrator/components/com_workflow/tmpl/workflows/default.php

@@ -53,7 +53,7 @@
 			<div id="j-main-container" class="j-main-container">
 				<?php
 					// Search tools bar
-					echo LayoutHelper::render('joomla.searchtools.default', array('view' => $this));
+					echo LayoutHelper::render('joomla.searchtools.default', array('view' => $this, 'options' => array('selectorFieldName' => 'extension')));
 				?>
 				<?php if (empty($this->workflows)) : ?>
 					<div class="alert alert-info">
@@ -169,7 +169,6 @@
 				<?php endif; ?>
 				<input type="hidden" name="task" value="">
 				<input type="hidden" name="boxchecked" value="0">
-				<input type="hidden" name="extension" value="<?php echo $extension ?>">
 				<?php echo HTMLHelper::_('form.token'); ?>
 			</div>
 		</div>

libraries/src/Workflow/WorkflowServiceInterface.php

@@ -80,4 +80,13 @@ public static function getConditions(string $extension): array;
 	 * @since   4.0.0
 	 */
 	public function getWorkflowTableBySection(?string $section = null): string;
+
+	/**
+	 * Returns valid contexts.
+	 *
+	 * @return  array
+	 *
+	 * @since   4.0.0
+	 */
+	public function getWorkflowContexts(): array;
 }