/******************************************************************************* 
                        ========================
                        Software Guide Quicktags  
                        ========================
--------------------------------------------------------------------------------
Version:     1.0
Author:        Michael W�hrer, http://www.sw-guide.de
Based on:     JS QuickTags version 1.2, Copyright (c) 2002-2005 Alex King
            http://alexking.org/index.php?content=software/javascript/content.php
Licensed:     Under the LGPL license, http://www.gnu.org/copyleft/lesser.html
--------------------------------------------------------------------------------
Purpose:
    This JavaScript will insert the tags below at the cursor position in IE and 
    Gecko-based browsers (Mozilla, Camino, Firefox, Netscape). For browsers that 
    do not support inserting at the cursor position (Safari, OmniWeb) it appends
    the tags to the end of the content.
--------------------------------------------------------------------------------
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. 
*******************************************************************************/

/*******************************************************************************
 * Some needed variables
 ******************************************************************************/
var qtButtons = new Array();
var qtOpenTags = new Array();



/*******************************************************************************
 *  --------   CONFIGURATION ----------
 ******************************************************************************/
    
    /*===============================================
    PART 1: Modifying height of textarea field.
        2 buttons are provided to modify the height of the textarea.
        Below you can change the default values. Each value sets the number
        of lines. Please note that Firefox always adds one extra line, so if
        you enter for example "10", Firefox will display 11 lines...
    ================================================= */
    var height_max = 30;    // Maximum height 
    var height_min = 5;        // Minimum height
    var height_step = 5;    // How many lines being increased/decreased per button click
    
    
    
    /*===============================================
    PART 2: Define buttons. 
        The "function qtButton" shows the properties you have.
        Feel free to change the order the buttons by moving the
        "qtButtons.push()" up or down.  
    ================================================= */
    function qtButton(id, display, tagStart, tagEnd, title, access, open) {
        this.id = id;                // used to name the toolbar button
        this.display = display;        // label on button
        this.tagStart = tagStart;     // open tag
        this.tagEnd = tagEnd;        // close tag
        this.title = title;            // title...
        this.access = access;        // key access via alt + ...
        this.open = open;            // set to -1 if tag does not need to be closed
    }
    
    qtButtons.push(
        new qtButton('qt_bold', 'Жирно', '<strong>' ,'</strong>' ,'Выделить жирным', 'b')
    );
    qtButtons.push(
        new qtButton('qt_italic', 'Курсив', '<em>', '</em>' ,'Выделить курсивом', 'k')
    );
    qtButtons.push(
        new qtButton('qt_block', 'Цитата', '<blockquote>', '</blockquote>' ,'Цитировать', 'z')
    );
    qtButtons.push(
        new qtButton('qt_code', 'Код', '<code>', '</code>' ,'Код', 'c')
    );
    qtButtons.push( // Special button: LINK
        new qtButton('qt_link', 'Ссылка', '', '</a>' ,'Ссылка', 'l')
    );
    /*
    qtButtons.push( // Special button: CLOSE TAGS
        new qtButton('qt_close', 'Tags schliessen', '', '' ,'Alle Tags schliessen', 'l', -1)
    );
    */
    qtButtons.push( // Special button: INCREASE TEXTAREA HEIGHT
        new qtButton('qt_increase', '+', '', '' ,'Увеличить поле', 'l', -1)
    );
    qtButtons.push( // Special button: DECREASE TEXTAREA HEIGHT
        new qtButton('qt_decrease', '-', '', '' ,'Уменьшить поле', 'l', -1)
    );
/*******************************************************************************
 *  --------   END OF CONFIGURATION ----------
 ******************************************************************************/


/*******************************************************************************
 * Main function to display the quicktags
 ******************************************************************************/
function displayQuicktags(textareaID) {

    textarea_id = textareaID;

    for (i = 0; i < qtButtons.length; i++) {
        qtShowButton(qtButtons[i], i);
    }
}


/*******************************************************************************
 * Auxiliary function: Change height of textarea
 ******************************************************************************/
function qtTextareaSize(type) {

    var height_current = document.getElementById(textarea_id).rows;

    switch (type) {
        case 'increase':
            if ( (height_current + height_step) > height_max ) {
                var my_heightchange = height_max;
            } else {
                var my_heightchange = height_current + height_step;
            }
            break;
        case 'decrease':
            if ( (height_current - height_step) < height_min ) {
                var my_heightchange = height_min;
            } else {
                var my_heightchange = height_current - height_step;
            }
            break;
        default:
            break;
    }
    document.getElementById(textarea_id).rows = my_heightchange;
}



/*******************************************************************************
 * Auxiliary function: Insert Link
 ******************************************************************************/
function qtInsertLink(myField, i, defaultValue) {
    if (!defaultValue) {
        defaultValue = 'http://';
    }
    if (!qtCheckOpenTags(i)) {
        var URL = prompt('URL:' ,defaultValue);
        if (URL) {
            qtButtons[i].tagStart = '<a target="_blank" href="' + URL + '">';
            qtInsertTag(myField, i);
        }
    }
    else {
        qtInsertTag(myField, i);
    }
}

/*******************************************************************************
 * Auxiliary function: Display buttons
 ******************************************************************************/
function qtShowButton(button, i) {

    // Add access key if variable is set
    if (button.access) {
        var accesskey = ' accesskey = "' + button.access + '"'
    }
    else {
        var accesskey = '';
    }

    // Add title key if variable is set
    if (button.title) {
        var titlevalue = ' title = "' + button.title + '"'
    }
    else {
        var titlevalue = '';
    }

    // Display button
    switch (button.id) {
        case 'qt_close': // close tags
            document.write('<input type="button" id="' + button.id + '" ' + accesskey + titlevalue + ' class="qt_button" onclick="qtCloseAllTags();" value="' + button.display + '" />');
            break;
        case 'qt_link': // link
            document.write('<input type="button" id="' + button.id + '" ' + accesskey + titlevalue + ' class="qt_button" onclick="qtInsertLink(document.getElementById(textarea_id), ' + i + ');" value="' + button.display + '" />');
            break;
        case 'qt_increase': // increase textarea size
            document.write('<input type="button" id="' + button.id + '" ' + accesskey + titlevalue + ' class="qt_button" onclick="qtTextareaSize(\'increase\');" value="' + button.display + '" />');
            break;
        case 'qt_decrease': // decrease textarea size
            document.write('<input type="button" id="' + button.id + '" ' + accesskey + titlevalue + ' class="qt_button" onclick="qtTextareaSize(\'decrease\');" value="' + button.display + '" />');
            break;
        default:
            document.write('<input type="button" id="' + button.id + '" ' + accesskey + titlevalue + ' class="qt_button" onclick="qtInsertTag(document.getElementById(textarea_id), ' + i + ');" value="' + button.display + '" />');
            break;
    }
}

/*******************************************************************************
 * Auxiliary function: Add Tag
 ******************************************************************************/
function qtAddTag(button) {
    if (qtButtons[button].tagEnd != '') {
        qtOpenTags[qtOpenTags.length] = button;
        document.getElementById(qtButtons[button].id).value = '/' + document.getElementById(qtButtons[button].id).value;
    }
}

/*******************************************************************************
 * Auxiliary function: Remove Tag
 ******************************************************************************/
function qtRemoveTag(button) {
    for (i = 0; i < qtOpenTags.length; i++) {
        if (qtOpenTags[i] == button) {
            qtOpenTags.splice(i, 1);
            document.getElementById(qtButtons[button].id).value = document.getElementById(qtButtons[button].id).value.replace('/', '');
        }
    }
}

/*******************************************************************************
 * Auxiliary function: Check open tags
 ******************************************************************************/
function qtCheckOpenTags(button) {
    var tag = 0;
    for (i = 0; i < qtOpenTags.length; i++) {
        if (qtOpenTags[i] == button) {
            tag++;
        }
    }
    if (tag > 0) {
        return true; // tag found
    }
    else {
        return false; // tag not found
    }
}    

/*******************************************************************************
 * Auxiliary function: Close all tags
 ******************************************************************************/
function qtCloseAllTags() {
    var count = qtOpenTags.length;
    for (o = 0; o < count; o++) {
        qtInsertTag(document.getElementById(textarea_id), qtOpenTags[qtOpenTags.length - 1]);
    }
}

/*******************************************************************************
 Insert Code functions
 ******************************************************************************/
function qtInsertTag(myField, i) {
    // IE support
    if (document.selection) {
        myField.focus();
        sel = document.selection.createRange();
        if (sel.text.length > 0) {
            sel.text = qtButtons[i].tagStart + sel.text + qtButtons[i].tagEnd;
        }
        else {
            if (!qtCheckOpenTags(i) || qtButtons[i].tagEnd == '') {
                sel.text = qtButtons[i].tagStart;
                qtAddTag(i);
            }
            else {
                sel.text = qtButtons[i].tagEnd;
                qtRemoveTag(i);
            }
        }
        myField.focus();
    }
    // MOZILLA/NETSCAPE support
    else if (myField.selectionStart || myField.selectionStart == '0') {
        var startPos = myField.selectionStart;
        var endPos = myField.selectionEnd;
        var cursorPos = endPos;
        var scrollTop = myField.scrollTop;
        if (startPos != endPos) {
            myField.value = myField.value.substring(0, startPos)
                          + qtButtons[i].tagStart
                          + myField.value.substring(startPos, endPos) 
                          + qtButtons[i].tagEnd
                          + myField.value.substring(endPos, myField.value.length);
            cursorPos += qtButtons[i].tagStart.length + qtButtons[i].tagEnd.length;
        }
        else {
            if (!qtCheckOpenTags(i) || qtButtons[i].tagEnd == '') {
                myField.value = myField.value.substring(0, startPos) 
                              + qtButtons[i].tagStart
                              + myField.value.substring(endPos, myField.value.length);
                qtAddTag(i);
                cursorPos = startPos + qtButtons[i].tagStart.length;
            }
            else {
                myField.value = myField.value.substring(0, startPos) 
                              + qtButtons[i].tagEnd
                              + myField.value.substring(endPos, myField.value.length);
                qtRemoveTag(i);
                cursorPos = startPos + qtButtons[i].tagEnd.length;
            }
        }
        myField.focus();
        myField.selectionStart = cursorPos;
        myField.selectionEnd = cursorPos;
        myField.scrollTop = scrollTop;
    }
    else {
        if (!qtCheckOpenTags(i) || qtButtons[i].tagEnd == '') {
            myField.value += qtButtons[i].tagStart;
            qtAddTag(i);
        }
        else {
            myField.value += qtButtons[i].tagEnd;
            qtRemoveTag(i);
        }
        myField.focus();
    }
}

function qtInsertContent(myField, myValue) {
    // IE support
    if (document.selection) {
        myField.focus();
        sel = document.selection.createRange();
        sel.text = myValue;
        myField.focus();
    }
    // MOZILLA/NETSCAPE support
    else if (myField.selectionStart || myField.selectionStart == '0') {
        var startPos = myField.selectionStart;
        var endPos = myField.selectionEnd;
        var scrollTop = myField.scrollTop;
        myField.value = myField.value.substring(0, startPos)
                      + myValue 
                      + myField.value.substring(endPos, myField.value.length);
        myField.focus();
        myField.selectionStart = startPos + myValue.length;
        myField.selectionEnd = startPos + myValue.length;
        myField.scrollTop = scrollTop;
    } else {
        myField.value += myValue;
        myField.focus();
    }
}