<?php /** * TImageButton class file * * @author Qiang Xue <qiang.xue@gmail.com> * @link http://www.pradosoft.com/ * @copyright Copyright © 2005 PradoSoft * @license http://www.pradosoft.com/license/ * @version $Id$ * @package System.Web.UI.WebControls */ /** * Includes TImage class file */ Prado::using('System.Web.UI.WebControls.TImage'); /** * TImageButton class * * TImageButton creates an image button on the page. It is used to submit data to a page. * You can create either a <b>submit</b> button or a <b>command</b> button. * * A <b>command</b> button has a command name (specified by * the {@link setCommandName CommandName} property) and and a command parameter * (specified by {@link setCommandParameter CommandParameter} property) * associated with the button. This allows you to create multiple TLinkButton * components on a Web page and programmatically determine which one is clicked * with what parameter. You can provide an event handler for * {@link onCommand OnCommand} event to programmatically control the actions performed * when the command button is clicked. In the event handler, you can determine * the {@link setCommandName CommandName} property value and * the {@link setCommandParameter CommandParameter} property value * through the {@link TCommandParameter::getName Name} and * {@link TCommandParameter::getParameter Parameter} properties of the event * parameter which is of type {@link TCommandEventParameter}. * * A <b>submit</b> button does not have a command name associated with the button * and clicking on it simply posts the Web page back to the server. * By default, a TImageButton control is a submit button. * You can provide an event handler for the {@link onClick OnClick} event * to programmatically control the actions performed when the submit button is clicked. * The coordinates of the clicking point can be obtained from the {@link onClick OnClick} * event parameter, which is of type {@link TImageClickEventParameter}. * * Clicking on button can trigger form validation, if * {@link setCausesValidation CausesValidation} is true. * And the validation may be restricted within a certain group of validator * controls by setting {@link setValidationGroup ValidationGroup} property. * If validation is successful, the data will be post back to the same page. * * TImageButton displays the {@link setText Text} property as the hint text to the displayed image. * * @author Qiang Xue <qiang.xue@gmail.com> * @version $Id$ * @package System.Web.UI.WebControls * @since 3.0 */ class TImageButton extends TImage implements IPostBackDataHandler, IPostBackEventHandler, IButtonControl { /** * @var integer x coordinate that the image is being clicked at */ private $_x=0; /** * @var integer y coordinate that the image is being clicked at */ private $_y=0; private $_dataChanged=false; /** * @return string tag name of the button */ protected function getTagName() { return 'input'; } /** * @return boolean whether to render javascript. */ public function getEnableClientScript() { return $this->getViewState('EnableClientScript',true); } /** * @param boolean whether to render javascript. */ public function setEnableClientScript($value) { $this->setViewState('EnableClientScript',TPropertyValue::ensureBoolean($value),true); } /** * Adds attribute name-value pairs to renderer. * This overrides the parent implementation with additional button specific attributes. * @param THtmlWriter the writer used for the rendering purpose */ protected function addAttributesToRender($writer) { $page=$this->getPage(); $page->ensureRenderInForm($this); $writer->addAttribute('type','image'); if(($uniqueID=$this->getUniqueID())!=='') $writer->addAttribute('name',$uniqueID); if($this->getEnabled(true)) { if($this->getEnableClientScript() && $this->needPostBackScript()) $this->renderClientControlScript($writer); } else if($this->getEnabled()) // in this case, parent will not render 'disabled' $writer->addAttribute('disabled','disabled'); parent::addAttributesToRender($writer); } /** * Renders the client-script code. */ protected function renderClientControlScript($writer) { $writer->addAttribute('id',$this->getClientID()); $cs = $this->getPage()->getClientScript(); $cs->registerPostBackControl($this->getClientClassName(),$this->getPostBackOptions()); } /** * Gets the name of the javascript class responsible for performing postback for this control. * This method overrides the parent implementation. * @return string the javascript class name */ protected function getClientClassName() { return 'Prado.WebUI.TImageButton'; } /** * @return boolean whether to perform validation if the button is clicked */ protected function canCauseValidation() { if($this->getCausesValidation()) { $group=$this->getValidationGroup(); return $this->getPage()->getValidators($group)->getCount()>0; } else return false; } /** * @param boolean set by a panel to register this button as the default button for the panel. */ public function setIsDefaultButton($value) { $this->setViewState('IsDefaultButton', TPropertyValue::ensureBoolean($value),false); } /** * @return boolean true if this button is registered as a default button for a panel. */ public function getIsDefaultButton() { return $this->getViewState('IsDefaultButton', false); } /** * @return boolean whether the button needs javascript to do postback */ protected function needPostBackScript() { return $this->canCauseValidation() || $this->getIsDefaultButton(); } /** * Returns postback specifications for the button. * This method is used by framework and control developers. * @return array parameters about how the button defines its postback behavior. */ protected function getPostBackOptions() { $options['ID'] = $this->getClientID(); $options['CausesValidation'] = $this->getCausesValidation(); $options['ValidationGroup'] = $this->getValidationGroup(); $options['EventTarget'] = $this->getUniqueID(); return $options; } /** * This method checks if the TImageButton is clicked and loads the coordinates of the clicking position. * This method is primarly used by framework developers. * @param string the key that can be used to retrieve data from the input data collection * @param array the input data collection * @return boolean whether the data of the component has been changed */ public function loadPostData($key,$values) { $uid=$this->getUniqueID(); if(isset($values["{$uid}_x"]) && isset($values["{$uid}_y"])) { $this->_x=intval($values["{$uid}_x"]); $this->_y=intval($values["{$uid}_y"]); if($this->getPage()->getPostBackEventTarget()===null) $this->getPage()->setPostBackEventTarget($this); $this->_dataChanged=true; } return false; } /** * A dummy implementation for the IPostBackDataHandler interface. */ public function raisePostDataChangedEvent() { // no post data to handle } /** * This method is invoked when the button is clicked. * The method raises 'OnClick' event to fire up the event handlers. * If you override this method, be sure to call the parent implementation * so that the event handler can be invoked. * @param TImageClickEventParameter event parameter to be passed to the event handlers */ public function onClick($param) { $this->raiseEvent('OnClick',$this,$param); } /** * This method is invoked when the button is clicked. * The method raises 'OnCommand' event to fire up the event handlers. * If you override this method, be sure to call the parent implementation * so that the event handlers can be invoked. * @param TCommandEventParameter event parameter to be passed to the event handlers */ public function onCommand($param) { $this->raiseEvent('OnCommand',$this,$param); $this->raiseBubbleEvent($this,$param); } /** * Raises the postback event. * This method is required by {@link IPostBackEventHandler} interface. * If {@link getCausesValidation CausesValidation} is true, it will * invoke the page's {@link TPage::validate validate} method first. * It will raise {@link onClick OnClick} and {@link onCommand OnCommand} events. * This method is mainly used by framework and control developers. * @param TEventParameter the event parameter */ public function raisePostBackEvent($param) { if($this->getCausesValidation()) $this->getPage()->validate($this->getValidationGroup()); $this->onClick(new TImageClickEventParameter($this->_x,$this->_y)); $this->onCommand(new TCommandEventParameter($this->getCommandName(),$this->getCommandParameter())); } /** * Returns a value indicating whether postback has caused the control data change. * This method is required by the IPostBackDataHandler interface. * @return boolean whether postback has caused the control data change. False if the page is not in postback mode. */ public function getDataChanged() { return $this->_dataChanged; } /** * @return boolean whether postback event trigger by this button will cause input validation, default is true */ public function getCausesValidation() { return $this->getViewState('CausesValidation',true); } /** * @param boolean whether postback event trigger by this button will cause input validation */ public function setCausesValidation($value) { $this->setViewState('CausesValidation',TPropertyValue::ensureBoolean($value),true); } /** * @return string the command name associated with the {@link onCommand OnCommand} event. */ public function getCommandName() { return $this->getViewState('CommandName',''); } /** * @param string the command name associated with the {@link onCommand OnCommand} event. */ public function setCommandName($value) { $this->setViewState('CommandName',$value,''); } /** * @return string the parameter associated with the {@link onCommand OnCommand} event */ public function getCommandParameter() { return $this->getViewState('CommandParameter',''); } /** * @param string the parameter associated with the {@link onCommand OnCommand} event. */ public function setCommandParameter($value) { $this->setViewState('CommandParameter',$value,''); } /** * @return string the group of validators which the button causes validation upon postback */ public function getValidationGroup() { return $this->getViewState('ValidationGroup',''); } /** * @param string the group of validators which the button causes validation upon postback */ public function setValidationGroup($value) { $this->setViewState('ValidationGroup',$value,''); } /** * @return string caption of the button */ public function getText() { return $this->getAlternateText(); } /** * @param string caption of the button */ public function setText($value) { $this->setAlternateText($value); } /** * Registers the image button to receive postback data during postback. * This is necessary because an image button, when postback, does not have * direct mapping between post data and the image button name. * This method overrides the parent implementation and is invoked before render. * @param mixed event parameter */ public function onPreRender($param) { parent::onPreRender($param); $this->getPage()->registerRequiresPostData($this); } /** * Renders the body content enclosed between the control tag. * This overrides the parent implementation with nothing to be rendered. * @param THtmlWriter the writer used for the rendering purpose */ public function renderContents($writer) { } } /** * TImageClickEventParameter class * * TImageClickEventParameter encapsulates the parameter data for * {@link TImageButton::onClick Click} event of {@link TImageButton} controls. * * @author Qiang Xue <qiang.xue@gmail.com> * @version $Id$ * @package System.Web.UI.WebControls * @since 3.0 */ class TImageClickEventParameter extends TEventParameter { /** * the X coordinate of the clicking point * @var integer */ private $_x=0; /** * the Y coordinate of the clicking point * @var integer */ private $_y=0; /** * Constructor. * @param integer X coordinate of the clicking point * @param integer Y coordinate of the clicking point */ public function __construct($x,$y) { $this->_x=$x; $this->_y=$y; } /** * @return integer X coordinate of the clicking point, defaults to 0 */ public function getX() { return $this->_x; } /** * @param integer X coordinate of the clicking point */ public function setX($value) { $this->_x=TPropertyValue::ensureInteger($value); } /** * @return integer Y coordinate of the clicking point, defaults to 0 */ public function getY() { return $this->_y; } /** * @param integer Y coordinate of the clicking point */ public function setY($value) { $this->_y=TPropertyValue::ensureInteger($value); } } ?>