Select Code Block Buttons

Add select button to select code blocks in stackoverflow
当前为 2019-05-15 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name           Select Code Block Buttons
// @namespace      stackoverflow
// @include        *stackoverflow.com*
// @include        *stackexchange.com*
// @include        *stackapps.com*
// @version        1.0
// @description    Add select button to select code blocks in stackoverflow
// ==/UserScript==

(function ()
{
    function with_jquery(f)
    {
        var script = document.createElement("script");
        script.type = "text/javascript";
        script.textContent = "(" + f.toString() + ")(jQuery)";
        document.body.appendChild(script);
    };

    with_jquery(function ($)
    {
        addButtons();

        function selectText(element)
        {
            var doc = document;
            if (doc.body.createTextRange)
            {
                var range = doc.body.createTextRange();
                range.moveToElementText(element);
                range.select();
            } else if (window.getSelection)
            {
                var selection = window.getSelection();
                var range = doc.createRange();
                range.selectNodeContents(element);
                selection.removeAllRanges();
                selection.addRange(range);
            }
        }

        function addButtons()
        {
            $("pre").each(function (i, codeBlock)
            {
                var qContainer = $("<div></div>");
                var id = "select-button-" + i;
                $(codeBlock).replaceWith(qContainer);
                qContainer.append(codeBlock);

                qContainer.mouseenter(function ()
                {
                    /*
                    var qButton = $('<div style="position: absolute; opacity: 0; display: inline; cursor: pointer;' +
                                     'background-color: #000; color: #fff; font-size: 12pt; padding: 3px;">' +
                                     'Select</div>');
                    qButton.attr("id", id);
                    qContainer.append(qButton);
                    var left = $(codeBlock).offset().left + $(codeBlock).width() - qButton.width();
                    var top = $(codeBlock).offset().top;
                    qButton.css("left", left);
                    qButton.css("top", top);
                    */

                    var qButton = $(`<div style="position: absolute;
                                    opacity: 0.6;
                                    display: inline;
                                    cursor: pointer;
                                    background-color: rgb(0, 0, 0);
                                    color: rgb(255, 255, 255);
                                    font-size: 12pt;
                                    padding: 3px;
                                    right: 0;
                                    top: 0;">Select</div>`);
                    qButton.attr("id", id);
                    qContainer.append(qButton);
                    qButton.click(function () {
                        selectText(codeBlock);
                    });
                    qButton.stop(true, true).animate({ opacity: '+=0.6' });
                });
                /*
                qContainer.mouseleave(function ()
                {
                    $("#" + id).stop(true, true).animate({ opacity: '-=0.6' }, function () { $("#" + id).remove(); });
                });
                */
            });
        }
    });
})();
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