~azzar1/unity/add-show-desktop-key

/* IVLE - Informatics Virtual Learning Environment

 * Copyright (C) 2007-2008 The University of Melbourne

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 *

 * Module: Tutorial system (client)

 * Author: Matt Giuca

 * Date: 25/1/2008

 */

/** User clicks "Run" button. Do an Ajax call and print the test output.

 */

function runexercise(exerciseid, filename)

{

    /* Get the source code the student is submitting */

    var exercisediv = document.getElementById(exerciseid);

    var exercisebox = exercisediv.getElementsByTagName("textarea")[0];

    var code = exercisebox.value;

    /* Dump the entire file to the console */

    var callback = function()

    {

        console_enter_line(code, "block");

    }

    start_server(callback)

    return;

}

/** Given a response object (JSON-parsed object), displays the result of the

 * test to the user. This modifies the given exercisediv's children.

 */

function handle_runresponse(exercisediv, runresponse)

{

    var runoutput = exercisediv.getElementsByTagName("textarea")[1];

    dom_removechildren(runoutput);

    runoutput.appendChild(document.createTextNode(runresponse.stdout));

}

/** User clicks "Submit" button. Do an Ajax call and run the test.

 * exerciseid: "id" of the exercise's div element.

 * filename: Filename of the exercise's XML file (used to identify the exercise

 *     when interacting with the server).

 */

function submitexercise(exerciseid, filename)

{

    var original_saved_status = get_saved_status(exerciseid);

    set_submit_status(exerciseid, filename, "Submitting...");

    set_saved_status(exerciseid, filename, "Saving...");

    /* Get the source code the student is submitting */

    var exercisediv = document.getElementById(exerciseid);

    var exercisebox = exercisediv.getElementsByTagName("textarea")[0];

    var code = exercisebox.value;

    var args = {"code": code, "exercise": filename, "action": "test"};

    /* Send the form as multipart/form-data, since we are sending a whole lump

     * of Python code, it should be treated like a file upload. */

    /* AJAX callback function */

    var callback = function(xhr)

        {

            var testresponse;

            try

            {

                testresponse = JSON.parse(xhr.responseText);

            }

            catch (ex)

            {

                alert("There was an error submitting or running your code. "

                    + "Please notify the administrators of this.");

                /* Since it failed, set the Save button back how it was. */

                set_saved_status(exerciseid, filename, original_saved_status);

                set_submit_status(exerciseid, filename, "Submit");

                return;

            }

            handle_testresponse(exercisediv, exerciseid, testresponse);

            set_saved_status(exerciseid, filename, "Saved");

            set_submit_status(exerciseid, filename, "Submit");

            /* Close the "view previous" area (force reload) */

            close_previous(exerciseid);

        }

    ajax_call(callback, "tutorialservice", "", args, "POST",

        "multipart/form-data");

}

/** User clicks "Save" button. Do an Ajax call to store it.

 * exerciseid: "id" of the exercise's div element.

 * filename: Filename of the exercise's XML file (used to identify the exercise

 *     when interacting with the server).

 */

function saveexercise(exerciseid, filename)

{

    set_saved_status(exerciseid, filename, "Saving...");

    /* Get the source code the student is submitting */

    var exercisediv = document.getElementById(exerciseid);

    var exercisebox = exercisediv.getElementsByTagName("textarea")[0];

    var code = exercisebox.value;

    var args = {"code": code, "exercise": filename, "action": "save"};

    /* Send the form as multipart/form-data, since we are sending a whole lump

     * of Python code, it should be treated like a file upload. */

    /* AJAX callback function */

    var callback = function(xhr)

        {

            // XXX Maybe check to see if this worked?

            set_saved_status(exerciseid, filename, "Saved");

        }

    ajax_call(callback, "tutorialservice", "", args, "POST",

        "multipart/form-data");

}

/** User clicks "Reset" button. Replace the contents of the user program text

 * box with the hidden "reset button backup" field, containing the original

 * partial fragment.

 * exerciseid: "id" of the exercise's div element.

 * filename: Filename of the exercise's XML file (used to identify the exercise

 *     when interacting with the server).

 */

function resetexercise(exerciseid, filename)

{

    conf_msg = "This will delete your solution to this exercise, and reset "

        + "it back to the default partial solution.\n\n"

        + "Are you sure you want to do this?";

    if (!confirm(conf_msg))

        return;

    /* Get the source code the student is submitting */

    var exercisediv = document.getElementById(exerciseid);

    var exercisebox = exercisediv.getElementsByTagName("textarea")[0];

    var resettextbox = document.getElementById("input_resettext_" + exerciseid);

    var text_urlencoded = resettextbox.value;

    /* Need to un-urlencode the value */

    exercisebox.value = decodeURIComponent(text_urlencoded);

    /* We changed the text, so make Save button available, and autosave after

     * 10 seconds. */

    set_saved_status(exerciseid, filename, "Save");

}

/* savetimers is a dict mapping exerciseIDs to timer IDs.

 * Its members indicate all exercises that have been modified but not saved.

 */

savetimers = {}

/** Changes whether an exercise is considered "saved" or not.

 * stat is a string which specifies the status, and also the button text.

 * If stat == "Save", then it indicates it is NOT saved. This will

 * enable the "Save" button, and set a timer going which will auto-save

 * after a set period of time (eg. 30 seconds).

 * Any other value will disable the "Save" button and disable the timer.

 * stat should be "Saving..." when the save request is issued, and "Saved"

 * when the response comes back.

 */

function set_saved_status(exerciseid, filename, stat)

{

    var timername = "savetimer_" + exerciseid;

    var button = document.getElementById("savebutton_" + exerciseid);

    var is_saved = stat != "Save";

    button.value = stat;

    /* Disable the timer, if it exists */

    if (typeof(savetimers[timername]) != "undefined")

    {

        clearTimeout(savetimers[timername]);

        savetimers[timername] = undefined;

    }

    if (is_saved)

    {

        /* Disable the button */

        button.disabled = true;

    }

    else

    {

        /* Enable the button */

        button.disabled = false;

        /* Create a timer which will auto-save when it expires */

        /* XXX: This is bad, but it's better than using repr and I want this

         * fixed quickly (wgrant). */

        var save_string = document.getElementById("savebutton_" + exerciseid).onclick;

        savetimers[timername] = setTimeout(save_string, 10000);

    }

}

/** Retrieves the saved status of a given exercise.

 * Returns "Save" if the exercise is modified and needs to be saved.

 * Returns "Saved" if the exercise has been saved and is unmodified.

 * Returns "Saving..." if the exercise is in the process of being saved

 *  (an ajax request is on its way).

 */

function get_saved_status(exerciseid)

{

    var button = document.getElementById("savebutton_" + exerciseid);

    return button.value;

}

/** Changes the state of the submit button, so it can appear disabled during

 * the submission process (to avoid multiple clicks).

 * stat is a string which specifies the status, and also the button text.

 * If stat == "Submit", then it indicates it is available for submission.

 * This will enable the "Submit" button.

 * Any other value (recommended: "Submitting...") will disable the "Submit"

 * button.

 */

function set_submit_status(exerciseid, filename, stat)

{

    var button = document.getElementById("submitbutton_" + exerciseid);

    button.disabled = stat != "Submit";

    button.value = stat;

}

/** Given a exercise div, return the testoutput div which is its child.

 * (The div which is its child whose class is "testoutput".

 */

function get_testoutput(exercisediv)

{

    var childs = exercisediv.childNodes;

    var i;

    var testoutput;

    for (i=0; i<childs.length; i++)

        if (childs[i].nodeType == exercisediv.ELEMENT_NODE &&

            childs[i].getAttribute("class") == "testoutput")

            return childs[i];

    return null;

}

/** Given a response object (JSON-parsed object), displays the result of the

 * test to the user. This modifies the given exercisediv's children.

 */

function handle_testresponse(exercisediv, exerciseid, testresponse)

{

    var testoutput = get_testoutput(exercisediv);

    var i, j;

    var ul;

    var case_ul;

    if (testoutput == null) return;     /* should not happen */

    dom_removechildren(testoutput);

    ul = document.createElement("ul");

    testoutput.appendChild(ul);

    if ("critical_error" in testresponse)

    {

        /* Only one error - and it's bad.

         * Just print and stop */

        ul.appendChild(create_response_item("critical", 0,

            testresponse.critical_error.name,

            testresponse.critical_error.detail));

        return;

    }

    for (i=0; i<testresponse.cases.length; i++)

    {

        var testcase = testresponse.cases[i];

        if ("exception" in testcase)

        {

            /* User's code threw an exception */

            fail_li = create_response_item("fail", 0, testcase.name);

            ul.appendChild(fail_li);

            /* Create a sub-ul to display the failing cases. */

            case_ul = document.createElement("ul");

            fail_li.appendChild(case_ul);

            case_ul.appendChild(create_response_item("exception", 0,

                testcase.exception.name, testcase.exception.detail));

        }

        else if (testcase.passed)

        {

            /* All parts of the test case passed. Just report the overall case

             * passing. */

	    ul.appendChild(create_response_item("pass", 0, testcase.name));

        }

        else

        {

            var fail_li = create_response_item("fail", 0, testcase.name);

            ul.appendChild(fail_li);

            /* Create a sub-ul to display the failing cases. */

            case_ul = document.createElement("ul");

            fail_li.appendChild(case_ul);

            for (j=0; j<testcase.parts.length; j++)

            {

                var part = testcase.parts[j];

                if (part.passed)

                {

                    case_ul.appendChild(create_response_item("pass", 1,

                        part.description));

                }

                else

                {

                    case_ul.appendChild(create_response_item("fail", 1,

                        part.description /*, part.error_message */));

                }

            }

        }

    }

    /* Update the summary box (completed, attempts) with the new values we got

     * back from the tutorialservice.

     * (Also update the balls in the table-of-contents).

     */

    var toc_li = document.getElementById("toc_li_" + exerciseid);

    var summaryli = document.getElementById("summaryli_" + exerciseid);

    var summarycomplete = document.getElementById("summarycomplete_"

        + exerciseid);

    var summaryattempts = document.getElementById("summaryattempts_"

        + exerciseid);

    toc_li.setAttribute("class",

        (testresponse.completed ? "complete" : "incomplete"));

    summaryli.setAttribute("class",

        (testresponse.completed ? "complete" : "incomplete"));

    summarycomplete.removeChild(summarycomplete.lastChild);

    summarycomplete.appendChild(document.createTextNode(testresponse.completed

        ? "Complete" : "Incomplete"));

    var old_attempts_value = summaryattempts.lastChild.data;

    summaryattempts.removeChild(summaryattempts.lastChild);

    summaryattempts.appendChild(document.createTextNode(

        testresponse.attempts));

    if (testresponse.completed && testresponse.attempts == 1 &&

        old_attempts_value == "0")

    {

        /* Add "Well done" for extra congratulations */

        summaryli.appendChild(document.createTextNode(

            " Well done!"));

    }

}

/* DOM creators for test case response elements */

/** Create a <li> element for the result of a test case.

 * type: "pass", "fail", "exception" or "critical"

 * level is 0 for outer, and 1 for inner

 * For exceptions and crits, "desc" is the exception name,

 * detail is the message; detail should be null for passing cases.

 */

function create_response_item(type, level, desc, detail)

{

    var crit = false;

    if (type == "critical")

    {

        /* Crits look like exceptions, but are slightly different */

        crit = true;

        type = "exception";

    }

    var li = document.createElement("li");

    if (level == 0)

    {

        li.setAttribute("class", type);

    }

    else

    {

        if (type == "pass") { li.setAttribute("class", "check") }

        else { li.setAttribute("class", "cross") }

    }

    if (level == 0) /* print Pass/Fail tag at outer level only */

    {

        var b = document.createElement("b");

        var text = type.charAt(0).toUpperCase() + type.substr(1) + ":";

        b.appendChild(document.createTextNode(text));

        li.appendChild(b);

    }

    if (type == "pass")

        text = desc;

    else if (type == "fail")

        text = desc + (detail == null ? "" : ":");

    else if (type == "exception")

    {

        if (crit)

            text = "Your code could not be executed, "

                + "due to the following error:";

        else

            text = "The following exception occured "

                + "while running your code:";

    }

    li.appendChild(document.createTextNode(" " + text));

    if (type == "pass" || (type == "fail" && detail == null))

        return li;

    /* Non-passes, display the error message */

    li.appendChild(document.createElement("br"));

    if (type == "exception")

    {

        b = document.createElement("b");

        b.appendChild(document.createTextNode(desc + ":"));

        li.appendChild(b);

    }

    li.appendChild(document.createTextNode(detail));

    return li;

}

/** Special key handlers for exercise text boxes */

function catch_textbox_input(exerciseid, filename, key)

{

    /* NOTE: Copied and modified from console/console.js:catch_input. */

    /* Always update the saved status, so it will enable the save button and

     * auto-save timer. */

    set_saved_status(exerciseid, filename, "Save");

    var inp = document.getElementById('textarea_' + exerciseid);

    switch (key)

    {

    case 9:                 /* Tab key */

        var selstart = inp.selectionStart;

        var selend = inp.selectionEnd;

        var chars_added;

        if (selstart == selend)

        {

            /* No selection, just a carat. Insert a tab here. */

            inp.value = inp.value.substr(0, selstart)

                + TAB_STRING + inp.value.substr(selstart);

            chars_added = TAB_STRING.length;

        }

        else

        {

            /* Text is selected.

             * Indent each line that is selected.

             */

            var pre_sel = inp.value.substr(0, selstart);

            var in_sel = inp.value.substr(selstart, selend-selstart);

            var post_sel = inp.value.substr(selend);

            /* Move everything after the last newline in pre_sel to in_sel,

             * so it will be indented too (ie. the first line

             * partially-selected). */

            var pre_sel_newline = pre_sel.lastIndexOf('\n')+1;

            in_sel = pre_sel.substr(pre_sel_newline) + in_sel;

            pre_sel = pre_sel.substr(0, pre_sel_newline);

            /* Now insert TAB_STRING before each line of in_sel */

            in_sel = in_sel.split('\n');

            var new_in_sel = TAB_STRING + in_sel[0]

            for (var i=1; i<in_sel.length; i++)

                new_in_sel += '\n' + TAB_STRING + in_sel[i];

            chars_added = TAB_STRING.length * in_sel.length;

            inp.value = pre_sel + new_in_sel + post_sel;

        }

        /* Update the selection so the same characters as before are selected

         */

        inp.selectionStart = selstart + chars_added;

        inp.selectionEnd = inp.selectionStart + (selend - selstart);

        /* Cancel the event, so the TAB key doesn't move focus away from this

         * box */

        return false;

        /* Note: If it happens that some browsers don't support event

         * cancelling properly, this hack might work instead:

        setTimeout(

            "document.getElementById('console_inputText').focus()",

            0);

         */

        break;

    }

}

/** User clicks "view previous attempts" button. Do an Ajax call and populate.

 * exerciseid: "id" of the exercise's div element.

 * filename: Filename of the exercise's XML file (used to identify the

 *     exercise when interacting with the server).

 */

function open_previous(exerciseid, filename)

{

    var exercisediv = document.getElementById(exerciseid);

    var divs = exercisediv.getElementsByTagName("div");

    var attempthistory;

    for (var i=0; i<divs.length; i++)

        if (divs[i].getAttribute("class") == "attempthistory")

            attempthistory = divs[i];

    /* Get handles on the four existing elements of the history box */

    var openbutton = attempthistory.getElementsByTagName("p")[0];

    var openarea = attempthistory.getElementsByTagName("div")[0];

    var dropdown = attempthistory.getElementsByTagName("select")[0];

    var textarea = attempthistory.getElementsByTagName("textarea")[0];

    /* Activate the "open" state, and clear the dropdown box */

    openbutton.setAttribute("style", "display: none");

    openarea.setAttribute("style", "display: auto");

    textarea.setAttribute("style", "display: none");

    dom_removechildren(dropdown);

    var pleasewait = document.createElement("option");

    pleasewait.appendChild(document.createTextNode("Retrieving past attempts..."));

    dropdown.appendChild(pleasewait);

    var args = {"exercise": filename, "action": "getattempts"};

    /* Send the form as multipart/form-data, since we are sending a whole lump

     * of Python code, it should be treated like a file upload. */

    /* AJAX callback function */

    var callback = function(xhr)

        {

            var attempts;

            var attempt;

            var opt;

            try

            {

                attempts = JSON.parse(xhr.responseText);

            }

            catch (ex)

            {

                alert("There was an error fetching your attempt history. "

                    + "Please notify the administrators of this.");

                return;

            }

            /* Populate the attempt history div */

            dom_removechildren(dropdown);

            for (var i=0; i<attempts.length; i++)

            {

                /* An object with a date and complete */

                attempt = attempts[i];

                opt = document.createElement("option");

                opt.setAttribute("value", attempt.date);

                opt.appendChild(document.createTextNode(attempt.date));

                if (attempt.complete)

                {

                    /* Add a little green ball to this option

                     * This is probably hideously illegal, but looks nice :)

                     */

                    opt.appendChild(document.createTextNode(" "));

                    var img = document.createElement("img");

                    img.setAttribute("src",

                        make_path("media/images/tutorial/tiny/complete.png"));

                    img.setAttribute("alt", "Complete");

                    opt.appendChild(img);

                }

                dropdown.appendChild(opt);

            }

        }

    ajax_call(callback, "tutorialservice", "", args, "GET");

}

function close_previous(exerciseid)

{

    var exercisediv = document.getElementById(exerciseid);

    var divs = exercisediv.getElementsByTagName("div");

    var attempthistory;

    for (var i=0; i<divs.length; i++)

        if (divs[i].getAttribute("class") == "attempthistory")

            attempthistory = divs[i];

    /* Get handles on the four existing elements of the history box */

    var openbutton = attempthistory.getElementsByTagName("p")[0];

    var openarea = attempthistory.getElementsByTagName("div")[0];

    /* Deactivate the "open" state */

    openbutton.setAttribute("style", "display: auto");

    openarea.setAttribute("style", "display: none");

}

/** User selects an attempt in the dropdown. Do an Ajax call and populate.

 * exerciseid: "id" of the exercise's div element.

 * filename: Filename of the exercise's XML file (used to identify the

 *     exercise when interacting with the server).

 */

function select_attempt(exerciseid, filename)

{

    var exercisediv = document.getElementById(exerciseid);

    var divs = exercisediv.getElementsByTagName("div");

    var attempthistory;

    for (var i=0; i<divs.length; i++)

        if (divs[i].getAttribute("class") == "attempthistory")

            attempthistory = divs[i];

    /* Get handles on the four existing elements of the history box */

    var dropdown = attempthistory.getElementsByTagName("select")[0];

    var textarea = attempthistory.getElementsByTagName("textarea")[0];

    /* Get the "value" of the selected option */

    var date = dropdown.options[dropdown.selectedIndex].getAttribute("value");

    var args = {"exercise": filename, "action": "getattempt", "date": date};

    /* Send the form as multipart/form-data, since we are sending a whole lump

     * of Python code, it should be treated like a file upload. */

    /* AJAX callback function */

    var callback = function(xhr)

        {

            var attempt;

            try

            {

                attempt = JSON.parse(xhr.responseText).code;

            }

            catch (ex)

            {

                alert("There was an error fetching your attempt history. "

                    + "Please notify the administrators of this.");

                return;

            }

            if (attempt == null)

            {

                /* There was no data for this date - that's odd */

                alert("There was no attempt made before that date.");

                return;

            }

            /* Populate the attempt text field */

            dom_removechildren(textarea);

            textarea.appendChild(document.createTextNode(attempt));

            textarea.setAttribute("style", "display: auto");

        }

    ajax_call(callback, "tutorialservice", "", args, "GET");

}