source: Dev/trunk/classes/pipelineSequencer.php @ 151

<?php
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 * A visual interface object for editing and viewing a session's pipeline.
 *
 * @author Tschipper
 */
class PipelineSequencer {

    // properties
    private $pipeline;      // array of UID strings.
    private $name = "empty";
    private $numStepsInArray = 0;
    private $maxNumStepsInArray = 10;
    private $selectedStep;

    public function __construct($uid) {
        $dbi = new DatabaseInterface();
        $this->pipeline = $dbi->get("pipeline", array("uid" => $uid));
    }

    public function init() {
        ?>
        <br /><form name="sequencer" action="pipelineEditor.php" method="post">
            <fieldset id="sequencer">
                <div class="title">Name: <?php echo $this->pipeline->name; ?> </div>

                <div id="seqContent">
                    <?php $this->DrawSteps(); ?>          
                </div>

                <div id="controls">
                    <input type="submit" name="moveSelectedLeft" value="< Move" class="surveyButton" />
                    <input type="submit" name="moveSelectedRight" value="Move >" class="surveyButton" />
                    <input type="submit" name="editSelected" value="Edit step" class="surveyButton" />
                    <input type="submit" name="deleteSelected" value="Delete step" class="surveyButton" />
                    <input type="submit" name="clearPipeline" value="Clear pipeline" class="surveyButton dis" disabled="true"/>
                    <input type="checkbox" name="confirmClear" onChange="IsCheckEnabled(this, document.sequencer.clearPipeline);" />Really clear?
                    <input type="hidden" name="selectedStep" />
                    <input type="hidden" name="numSteps" />
                    <input type="hidden" name="pipeline" />
                </div>
            </fieldset>
        </form>
        <?php
    }

    public function DrawSteps() {
        
    }

    private function Javascript() {
        ?>
        <!-- 
        Add JS code for selecting steps, highlighting them, reordering, etc.
        Is a refresh of the page (with subsequent querying of database really necessary?

        -->
        <script type="text/javascript">
            function selectStep(uid) {
                document.getElementById(uid).addClass("selected");
                document.sequencer.controls.selectedStep.value = uid;
            }
                                                                            
                                                                            
            /*
             * ajaxStepRequest gets  the markup for displaying a step in the sequencer from returnStep.php
             * Using ajax principle allows for editing of pipeline without constantly refreshing the page.
             */
                                                                            
            function ajaxStepRequest(uid) {     
                var xmlhttp;
                if (window.XMLHttpRequest) {    // IE7+, FF, Chrome, Opera, Safari
                    xmlhttp = new XMLHttpRequest();
                }
                else {  //IE 5, 6
                    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
                }
                                                                                
                xmlhttp.onreadystatechange = function () {
                    if (xmlhttp.readyState==4 && xmlhttp.status==200) {
                        if (xmlhttp.responseText.length > 0) {
                            var newDiv = xmlhttp.responseText;
                            document.getElementById("seqContent").appendChild(newDiv);
                        }   
                    }
                }
                                        
                xmlhttp.open("POST", "returnStep.php", true);
                xmlhttp.send();
            }
                            
            function drawSteps() {
                var sequencer = document.getElementById("sequencer");
                var seqContent = document.getElementById("seqContent");
                
                // first delete all current children of seqContent (to reset the sequencer).
                while (seqContent.childNodes.length > 0) {
                    var step = seqContent.childNodes[0];
                    step.parentNode.removeChild(step);
                }
                
                // get pipeline contents from hidden form inputs.
                var pipeline = sequencer.controls.pipeline.value;
                var pipeline = pipeline.split(", ");
                
                // then do an xmlhttp request for each step to be added to the sequencer
                var numberOfSteps = pipeline.length;
                for (var i = 0; i > numberOfSteps; i++) {
                    ajaxStepRequest(pipeline[i]);
                }
                
            }
                                                                                
                                                
        </script>


        <?php
    }

    public function GetDromDB() {   // Initialize variables on page load.
        $dbi = new DatabaseInterface();
        if (isset($_POST['currentSession'])) {
            $currentSession = $dbi->get("Session", array("UID" => $uid));
            $this->pipeline = $currentSession->pipeline;
        }
    }

}
?>