footnotes/class/dashboard/layout.php

<?php
/**
 * Includes Layout Engine for the admin dashboard.
 *
 * @filesource
 * @author Stefan Herndler
 * @since  1.5.0 12.09.14 10:56
 */


/**
 * Layout Engine for the administration dashboard.
 *
 * @author Stefan Herndler
 * @since  1.5.0
 */
abstract class MCI_Footnotes_LayoutEngine {

	/**
	 * Stores the Hook connection string for the child sub page.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @var null|string
	 */
	protected $a_str_SubPageHook = null;

	/**
	 * Stores all Sections for the child sub page.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @var array
	 */
	protected $a_arr_Sections = array();

	/**
	 * Returns a Priority index. Lower numbers have a higher Priority.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @return int
	 */
	abstract public function getPriority();

	/**
	 * Returns the unique slug of the child sub page.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @return string
	 */
	abstract protected function getSubPageSlug();

	/**
	 * Returns the title of the child sub page.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @return string
	 */
	abstract protected function getSubPageTitle();

	/**
	 * Returns an array of all registered sections for a sub page.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @return array
	 */
	abstract protected function getSections();

	/**
	 * Returns an array of all registered meta boxes.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @return array
	 */
	abstract protected function getMetaBoxes();

	/**
	 * Returns an array describing a sub page section.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @param string $p_str_ID Unique ID suffix.
	 * @param string $p_str_Title Title of the section.
	 * @param int $p_int_SettingsContainerIndex Settings Container Index.
	 * @param bool $p_bool_hasSubmitButton Should a Submit Button be displayed for this section, default: true.
	 * @return array Array describing the section.
	 */
	protected function addSection($p_str_ID, $p_str_Title, $p_int_SettingsContainerIndex, $p_bool_hasSubmitButton = true) {
		return array("id" => MCI_Footnotes_Config::C_STR_PLUGIN_NAME . "-" . $p_str_ID, "title" => $p_str_Title, "submit" => $p_bool_hasSubmitButton, "container" => $p_int_SettingsContainerIndex);
	}

	/**
	 * Returns an array describing a meta box.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @param string $p_str_SectionID Parent Section ID.
	 * @param string $p_str_ID Unique ID suffix.
	 * @param string $p_str_Title Title for the meta box.
	 * @param string $p_str_CallbackFunctionName Class method name for callback.
	 * @return array meta box description to be able to append a meta box to the output.
	 */
	protected function addMetaBox($p_str_SectionID, $p_str_ID, $p_str_Title, $p_str_CallbackFunctionName) {
		return array("parent" => MCI_Footnotes_Config::C_STR_PLUGIN_NAME . "-" . $p_str_SectionID, "id" => $p_str_ID, "title" => $p_str_Title, "callback" => $p_str_CallbackFunctionName);
	}

	/**
	 * Registers a sub page.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 */
	public function registerSubPage() {
		global $submenu;
		// iterate through each sub menu
		foreach($submenu as $l_arr_SubMenu) {
			// iterate through each sub menu attribute
			foreach($l_arr_SubMenu as $l_str_Attribute) {
				// sub menu already added, stop
				if ($l_str_Attribute == MCI_Footnotes_Layout_Init::C_STR_MAIN_MENU_SLUG . $this->getSubPageSlug()) {
					return;
				}
			}
		}

		$this->a_str_SubPageHook = add_submenu_page(
			MCI_Footnotes_Layout_Init::C_STR_MAIN_MENU_SLUG, // parent slug
			$this->getSubPageTitle(), // page title
			$this->getSubPageTitle(), // menu title
			'manage_options', // capability
			MCI_Footnotes_Layout_Init::C_STR_MAIN_MENU_SLUG . $this->getSubPageSlug(), // menu slug
			array($this, 'displayContent') // function
		);
	}

	/**
	 * Registers all sections for a sub page.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 */
	public function registerSections() {
		// iterate through each section
		foreach($this->getSections() as $l_arr_Section) {
			// append tab to the tab-array
			$this->a_arr_Sections[$l_arr_Section["id"]] = $l_arr_Section;
			add_settings_section(
				$l_arr_Section["id"], // unique id
				"", //$l_arr_Section["title"], // title
				array($this, 'Description'), // callback function for the description
				$l_arr_Section["id"] // parent sub page slug
			);
			$this->registerMetaBoxes($l_arr_Section["id"]);
		}
	}

	/**
	 * Registers all Meta boxes for a sub page.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @param string $p_str_ParentID Parent section unique id.
	 */
	private function registerMetaBoxes($p_str_ParentID) {
		// iterate through each meta box
		foreach($this->getMetaBoxes() as $l_arr_MetaBox) {
			if ($l_arr_MetaBox["parent"] != $p_str_ParentID) {
				continue;
			}
			add_meta_box(
				$p_str_ParentID. "-" . $l_arr_MetaBox["id"], // unique id
				$l_arr_MetaBox["title"], // meta box title
				array($this, $l_arr_MetaBox["callback"]), // callback function to display (echo) the content
				$p_str_ParentID, // post type = parent section id
				'main' // context
			);
		}
	}

	/**
	 * Append javascript and css files for specific sub page.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 */
	private function appendScripts() {
		// add jQuery to the sub menu page
		wp_enqueue_script('jquery');
		// enable meta boxes layout and close functionality
		wp_enqueue_script('postbox');
		// register stylesheet
		wp_register_style('mci-footnotes-admin-styles', plugins_url('../../css/settings.css', __FILE__));
		// add stylesheet to the output
		wp_enqueue_style('mci-footnotes-admin-styles');
	}

	/**
	 * Displays the content of specific sub page.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 */
	public function displayContent() {
		// register and enqueue scripts and styling
		$this->appendScripts();
		// get current section
		reset($this->a_arr_Sections);
		$l_str_ActiveSectionID = isset($_GET['t']) ? $_GET['t'] : key($this->a_arr_Sections);
		$l_arr_ActiveSection = $this->a_arr_Sections[$l_str_ActiveSectionID];
		// store settings
		$l_bool_SettingsUpdated = false;
		if (array_key_exists("save-settings", $_POST)) {
			if ($_POST["save-settings"] == "save") {
				$l_bool_SettingsUpdated = $this->saveSettings();
			}
		}

		// display all sections and highlight the active section
		echo '<div class="wrap">';
		echo '<h2 class="nav-tab-wrapper">';
		// iterate through all register sections
		foreach ($this->a_arr_Sections as $l_str_ID => $l_arr_Description) {
			echo sprintf(
				'<a class="nav-tab%s" href="?page=%s&t=%s">%s</a>',
				$l_arr_ActiveSection["id"] == $l_str_ID ? ' nav-tab-active' : '',
				MCI_Footnotes_Layout_Init::C_STR_MAIN_MENU_SLUG . $this->getSubPageSlug(), $l_str_ID, $l_arr_Description["title"]
			);
		}
		echo '</h2><br/>';

		if ($l_bool_SettingsUpdated) {
			echo sprintf('<div id="message" class="updated">%s</div>', __("Settings saved", MCI_Footnotes_Config::C_STR_PLUGIN_NAME));
		}

		// form to submit the active section
		echo '<!--suppress HtmlUnknownTarget --><form method="post" action="">';
		settings_fields($l_arr_ActiveSection["container"]);
		echo '<input type="hidden" name="save-settings" value="save" />';
		// outputs the settings field of the active section
		do_settings_sections($l_arr_ActiveSection["id"]);
		do_meta_boxes($l_arr_ActiveSection["id"], 'main', NULL);

		// add submit button to active section if defined
		if ($l_arr_ActiveSection["submit"]) {
			submit_button();
		}
		// close the form to submit data
		echo '</form>';
		// close container for the settings page
		echo '</div>';
		// output special javascript for the expand/collapse function of the meta boxes
		echo '<script type="text/javascript">';
		echo "jQuery(document).ready(function ($) {";
		echo "jQuery('.if-js-closed').removeClass('if-js-closed').addClass('closed');";
		echo "postboxes.add_postbox_toggles('" . $this->a_str_SubPageHook . "');";
		echo "});";
		echo '</script>';
	}

	/**
	 * Save all Plugin settings.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @return bool
	 */
	private function saveSettings() {
		// get only Footnotes settings
		$l_arr_Settings = array();
		foreach($_POST as $l_str_SettingsName => $l_str_Value) {
			if (substr($l_str_SettingsName, 0, 8) == "footnote") {
				$l_arr_Settings[$l_str_SettingsName] = $l_str_Value;
			}
		}
		// get current section
		reset($this->a_arr_Sections);
		$l_str_ActiveSectionID = isset($_GET['t']) ? $_GET['t'] : key($this->a_arr_Sections);
		$l_arr_ActiveSection = $this->a_arr_Sections[$l_str_ActiveSectionID];
		// update settings
		return MCI_Footnotes_Settings::instance()->saveOptions($l_arr_ActiveSection["container"], $l_arr_Settings);
	}

	/**
	 * Output the Description of a section. May be overwritten in any section.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 */
	public function Description() {
		// default no description will be displayed
	}

	/**
	 * Loads specific setting and returns an array with the keys [id, name, value].
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @param string $p_str_SettingKeyName Settings Array key name.
	 * @return array Contains Settings ID, Settings Name and Settings Value.
	 */
	protected function LoadSetting($p_str_SettingKeyName) {
		// get current section
		reset($this->a_arr_Sections);
		$l_str_ActiveSectionID = isset($_GET['t']) ? $_GET['t'] : key($this->a_arr_Sections);
		$l_arr_ActiveSection = $this->a_arr_Sections[$l_str_ActiveSectionID];

		$p_arr_Return = array();
		$p_arr_Return["id"] = sprintf('%s', $p_str_SettingKeyName);
		//$p_arr_Return["name"] = sprintf('%s[%s]', MCI_Footnotes_Settings::instance()->getContainer($l_arr_ActiveSection["container"]), $p_str_SettingKeyName);
		$p_arr_Return["name"] = sprintf('%s', $p_str_SettingKeyName);
		$p_arr_Return["value"] = esc_attr(MCI_Footnotes_Settings::instance()->get($p_str_SettingKeyName));
		return $p_arr_Return;
	}

	/**
	 * Returns a line break to start a new line.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @return string
	 */
	protected function addNewline() {
		return '<br/>';
	}

	/**
	 * Returns a line break to have a space between two lines.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @return string
	 */
	protected function addLineSpace() {
		return '<br/><br/>';
	}

	/**
	 * Returns a simple text inside html <span> text.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @param string $p_str_Text Message to be surrounded with simple html tag (span).
	 * @return string
	 */
	protected function addText($p_str_Text) {
		return sprintf('<span>%s</span>', $p_str_Text);
	}

	/**
	 * Returns the html tag for an input/select label.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @param string $p_str_SettingName Name of the Settings key to connect the Label with the input/select field.
	 * @param string $p_str_Caption Label caption.
	 * @return string
	 */
	protected function addLabel($p_str_SettingName, $p_str_Caption) {
		if (empty($p_str_Caption)) {
			return "";
		}
		return sprintf('<label for="%s">%s:</label>', $p_str_SettingName, $p_str_Caption);
	}

	/**
	 * Returns the html tag for an input [type = text].
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @param string $p_str_SettingName Name of the Settings key to pre load the input field.
	 * @param int    $p_str_MaxLength Maximum length of the input, default 999 characters.
	 * @param bool   $p_bool_Readonly Set the input to be read only, default false.
	 * @param bool   $p_bool_Hidden Set the input to be hidden, default false.
	 * @return string
	 */
	protected function addTextBox($p_str_SettingName, $p_str_MaxLength = 999, $p_bool_Readonly = false, $p_bool_Hidden = false) {
		$l_str_Style = "";
		// collect data for given settings field
		$l_arr_Data = $this->LoadSetting($p_str_SettingName);
		if ($p_bool_Hidden) {
			$l_str_Style .= 'display:none;';
		}
		return sprintf('<input type="text" name="%s" id="%s" maxlength="%d" style="%s" value="%s" %s/>',
					   $l_arr_Data["name"], $l_arr_Data["id"], $p_str_MaxLength,
					   $l_str_Style, $l_arr_Data["value"], $p_bool_Readonly ? 'readonly="readonly"' : '');
	}

	/**
	 * Returns the html tag for an input [type = checkbox].
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @param string $p_str_SettingName Name of the Settings key to pre load the input field.
	 * @return string
	 */
	protected function addCheckbox($p_str_SettingName) {
		// collect data for given settings field
		$l_arr_Data = $this->LoadSetting($p_str_SettingName);
		return sprintf('<input type="checkbox" name="%s" id="%s" %s/>',
					   $l_arr_Data["name"], $l_arr_Data["id"],
					   MCI_Footnotes_Convert::toBool($l_arr_Data["value"]) ? 'checked="checked"' : '');
	}

	/**
	 * Returns the html tag for a select box.
	 *
	 * @author Stefan Herndler
	 * @since  1.5.0
	 * @param string $p_str_SettingName Name of the Settings key to pre select the current value.
	 * @param array  $p_arr_Options Possible options to be selected.
	 * @return string
	 */
	protected function addSelectBox($p_str_SettingName, $p_arr_Options) {
		// collect data for given settings field
		$l_arr_Data = $this->LoadSetting($p_str_SettingName);
		$l_str_Options = "";

		/* loop through all array keys */
		foreach ($p_arr_Options as $l_str_Value => $l_str_Caption) {
			$l_str_Options .= sprintf('<option value="%s" %s>%s</option>',
									  $l_str_Value,
									  $l_arr_Data["value"] == $l_str_Value ? "selected" : "",
									  $l_str_Caption);
		}
		return sprintf('<select name="%s" id="%s">%s</select>',
					   $l_arr_Data["name"], $l_arr_Data["id"], $l_str_Options);
	}

	/**
	 * Returns the html tag for a text area.
	 *
	 * @author Stefan Herndler
	 * @since 1.5.0
	 * @param string $p_str_SettingName Name of the Settings key to pre fill the text area.
	 * @return string
	 */
	protected function addTextArea($p_str_SettingName) {
		// collect data for given settings field
		$l_arr_Data = $this->LoadSetting($p_str_SettingName);
		return sprintf('<textarea name="%s" id="%s">%s</textarea>',
			$l_arr_Data["name"], $l_arr_Data["id"], $l_arr_Data["value"]);
	}

} // end of class