使用 electron 实现类似新版 QQ 的登录界面效果（阴影、背景动画、窗体3D翻转）

上文《使用 VS2017 和 js 进行桌面程序开发 - electron 之 Hello Word》介绍了如何使用 VS2017 开发 electron 桌面程序，今天来点有看头的，但是没什么技术含量，囧~~

现在什么都讲究追赶潮流，觉得 QQ 登录窗口做的效果不错，既然刚学习 electron ，那么就用 electron 模仿一下。其实主要用到的就是 CSS3 的效果：边框圆角、阴影，3D变换。对，就这么简单。先上效果：

下面是关键代码：

app.js

'use strict';

const { app, BrowserWindow } = require('electron')
const path = require('path')
const url = require('url')

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let win

function createWindow() {
    // Create the browser window.
    win = new BrowserWindow({
        width: 495, height: 470, /*skipTaskbar: true,*/ frame: false,
        resizable: false, transparent: true, show: false, alwaysOnTop: true
    })

    win.once('ready-to-show', () => {
        win.show()
    })

    // and load the index.html of the app.
    win.loadURL(url.format({
        pathname: path.join(__dirname, '/app/index.html'),
        protocol: 'file:',
        slashes: true
    }))

    // Open the DevTools.
    //win.webContents.openDevTools()

    // Emitted when the window is closed.
    win.on('closed', () => {
        // Dereference the window object, usually you would store windows
        // in an array if your app supports multi windows, this is the time
        // when you should delete the corresponding element.
        win = null
    })
}

//app.disableHardwareAcceleration();

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)

// Quit when all windows are closed.
app.on('window-all-closed', () => {
    // On macOS it is common for applications and their menu bar
    // to stay active until the user quits explicitly with Cmd + Q
    if (process.platform !== 'darwin') {
        app.quit()
    }
})

app.on('activate', () => {
    // On macOS it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (win === null) {
        createWindow()
    }
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

index.html

<!DOCTYPE html>
<html style="margin:0; padding:0;height:100%;">
<head>
    <meta charset="UTF-8">
    <title>QQ Login</title>
    <style>
        html, body {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
        }

        body {
            perspective: 800px;
            -webkit-app-region: drag;
            -webkit-user-select: none;
        }

        input[type="submit"],
        input[type="reset"],
        input[type="button"],
        input[type="text"],
        button,
        textarea {
            -webkit-app-region: no-drag;
        }

        .shadow {
            box-shadow: 0 0 10px rgba(0, 0, 0, 1);
            position: absolute;
            width: 100%;
            height: 100%;
            border-radius: 4px;
        }

        #login-back {
            position: relative;
            border-radius: 3px 3px 0 0;
            left: 0;
            right: 0;
            height: 180px;
        }

        #card {
            left: 33px;
            top: 70px;
            right: 33px;
            bottom: 70px;
            background-color: #ebf2f9;
            position: absolute;
            -webkit-transition: -webkit-transform .6s ease-in-out;
            transition: transform .6s ease-in-out;
            -webkit-transform-style: preserve-3d;
            transform-style: preserve-3d;
            border-radius: 4px;
        }

            #card.flipped {
                -webkit-transform: rotateY( 180deg );
                transform: rotateY( 180deg );
            }

            #card .front {
                background: url(imgs/login-back.gif) no-repeat;
                background-size: 100% 180px;
                position: absolute;
                transform: rotateY(0deg);
            }

            #card .back {
                position: absolute;
                background: url(imgs/login-back.gif) no-repeat;
                background-size: 100% 180px;
                -webkit-transform: rotateY( -180deg );
                transform: rotateY( -180deg );
                -webkit-backface-visibility: hidden;
                backface-visibility: hidden;
                z-index:2;
            } 

        .sys-control-box {
            float:right;
            width:84px;
            border-radius: 0 3px 0 0;
        }

        .sys-btn {
            width: 28px;
            height: 28px;
            border: none;
            outline: none;
            margin: 0;
        }

        .sys-btn-mini {
            background: url(imgs/btn_mini_normal.png) no-repeat;
        }

            .sys-btn-mini:hover {
                background: url(imgs/btn_mini_highlight.png) no-repeat;
            }

            .sys-btn-mini:active {
                background: url(imgs/btn_mini_down.png) no-repeat;
            }

        .sys-btn-close {
            border-radius: 0 3px 0 0;
            background: url(imgs/btn_close_normal.png) no-repeat;
        }

            .sys-btn-close:hover {
                background: url(imgs/btn_close_highlight.png) no-repeat;
            }

            .sys-btn-close:active {
                background: url(imgs/btn_close_down.png) no-repeat;
            }

        .sys-btn-set {
            background: url(imgs/btn_set_normal.png) 1px 0 no-repeat;
        }

            .sys-btn-set:hover {
                background: url(imgs/btn_set_hover.png) 1px 0 no-repeat;
            }

            .sys-btn-set:active {
                background: url(imgs/btn_set_press.png) 1px 0 no-repeat;
            }

        .btn {
            width: 78px;
            height: 28px;
            background: url(imgs/setting_btn_normal.png) no-repeat;
            background-size: 100% 100%;
            border: none;
            outline: none;
            margin: 0;
        }

            .btn:hover, .btn:active {
                background: url(imgs/setting_btn_hover.png) no-repeat;
                background-size: 100% 100%;
            }

            .btn:focus {
                background: url(imgs/setting_btn_hover.png) no-repeat;
                background-size: 100% 100%;
            }
    </style>
</head>
<body>
    <div id="card">
        <div id="front" class="front shadow">
            <div class="sys-control-box">
                <button id="btn-set" class="sys-btn sys-btn-set" title="设置"></button><button class="sys-btn sys-btn-mini" title="最小化"></button><button class="sys-btn sys-btn-close" title="关闭"></button>
            </div>
        </div>
        <div id="back" class="back shadow">
            <div style="width:100%;height:100%; border-radius: 4px;background:-webkit-linear-gradient(top, rgba(0, 0, 0, 0.00) 0%, rgba(0, 0, 0, 0.00) 6%, #ebf2f9 12%, #ebf2f9 90%, #cde2f2 90%, #cde2f2 100%);">
                <div class="sys-control-box" style="width:56px;">
                    <button class="sys-btn sys-btn-mini" title="最小化"></button><button class="sys-btn sys-btn-close" title="关闭"></button>
                </div>
                <button id="btn-ok" style="position:absolute; right:91px; bottom:2px;" class="btn">确定</button>
                <button id="btn-cancel" style="position:absolute; right:10px; bottom:2px;" class="btn">取消</button>
            </div>
        </div>
    </div>
    <script>
        Element.prototype.hasClassName = function (a) {
            return new RegExp("(?:^|\\s+)" + a + "(?:\\s+|$)").test(this.className);
        };

        Element.prototype.addClassName = function (a) {
            if (!this.hasClassName(a)) {
                this.className = [this.className, a].join(" ");
            }
        };

        Element.prototype.removeClassName = function (b) {
            if (this.hasClassName(b)) {
                var a = this.className;
                this.className = a.replace(new RegExp("(?:^|\\s+)" + b + "(?:\\s+|$)", "g"), " ");
            }
        };

        Element.prototype.toggleClassName = function (a) {
            this[this.hasClassName(a) ? "removeClassName" : "addClassName"](a);
        };

        //var init = function () {
        //    var card = document.getElementById('card');

        //    document.getElementById('front').addEventListener('click', function () {
        //        card.toggleClassName('flipped');
        //    }, false);

        //    document.getElementById('back').addEventListener('click', function () {
        //        card.toggleClassName('flipped');
        //    }, false);
        //};

        //window.addEventListener('DOMContentLoaded', init, false);
        (function () {

            const remote = require('electron').remote;

            function init() {

                function flip() {
                    if (frontShow == 2) {
                        document.getElementById('front').style.display = 'block';
                    }
                    else {
                        document.getElementById('back').style.display = 'block';
                    }
                    card.toggleClassName('flipped');
                };

                var btn_minis = document.getElementsByClassName("sys-btn-mini");
                for (var i = 0; i < btn_minis.length; i++) {
                    btn_minis[i].addEventListener("click", function (e) {
                        const window = remote.getCurrentWindow();
                        window.minimize();
                    });
                }

                //document.getElementById("sys-btn-maxi").addEventListener("click", function (e) {
                //    const window = remote.getCurrentWindow();
                //    if (!window.isMaximized()) {
                //        window.maximize();
                //    } else {
                //        window.unmaximize();
                //    }
                //});

                var btn_closes = document.getElementsByClassName("sys-btn-close");
                for (var i = 0; i < btn_closes.length; i++) {
                    btn_closes[i].addEventListener("click", function (e) {
                        const window = remote.getCurrentWindow();
                        window.close();
                    });
                }      

                var card = document.getElementById('card');
                var frontShow = 1;

                var btn_sets = document.getElementsByClassName("sys-btn-set");
                for (var i = 0; i < btn_sets.length; i++) {
                    btn_sets[i].addEventListener('click', function () { flip(); }, false);
                }  

                card.addEventListener('transitionend', function () {
                    if (frontShow == 1) {
                        frontShow = 2;
                        document.getElementById('front').style.display = 'none';
                    }
                    else {
                        document.getElementById('back').style.display = 'none';
                        frontShow = 1;
                    }
                }, false); 

                document.getElementById('btn-ok').addEventListener('click', function () { flip(); }, false);
                document.getElementById('btn-cancel').addEventListener('click', function () { flip(); }, false);
            };

            document.onreadystatechange = function () {
                if (document.readyState == "complete") {
                    init();
                }
            };
        })();
    </script>
</body>
</html>

最后整个项目的源代码：https://github.com/starts2000/ElectronQQLogin