.NET 创建无边框的跨平台应用

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.NET 创建无边框的跨平台应用

在创建了Photino应用程序以后我们发现它自带了一个标题栏，并且非常丑，我们现在要做的就是去掉这个很丑的自带标题栏，并且自定义一个更好看的，下面我们将用Masa Blazor提供的模板去进行实战。

安装模板

安装Masa Blazor提供的rc2的模板

dotnet new install Masa.Template::1.0.0-rc.2

创建项目

打开VS2022 => 新建项目
搜索到一下类别!
然后创建Gotrays名称的项目

项目结构

无边框处理

修改Program.cs代码，增加SetChromeless，设置无边框

using Gotrays;
using Microsoft.Extensions.DependencyInjection;
using Photino.Blazor;

internal class Program
{
    [STAThread]
    private static void Main(string[] args)
    {
        var appBuilder = PhotinoBlazorAppBuilder.CreateDefault(args);

        appBuilder.RootComponents.Add<App>("#app");
        appBuilder.Services.AddMasaBlazor();

        var app = appBuilder.Build();

        app.MainWindow
            .SetTitle("Photino Blazor Sample")
            .SetChromeless(true);

        AppDomain.CurrentDomain.UnhandledException += (sender, error) =>
        {
        };

        app.Run();
    }
}

启动以后的效果：

这样就完成了我们的无边框，但是也并不是直接可以使用，你会发现它无法拖动！下面我们将让他可以被拖动

完善无边框拖动

我们需要支持拖动我们的标题栏的时候带动我们的窗口！

下面开始修改代码实现这个逻辑

我们的标题栏的css的样式是m-app-bar

打开wwwroot/index.html并且修改为以下代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8" />
    <meta name="viewport"
          content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover" />
    <title>Gotrays</title>
    <base href="/" />
    <link href="_content/Masa.Blazor/css/masa-blazor.min.css" rel="stylesheet">
    <link href="css/app.css" rel="stylesheet" />
    <link href="Gotrays.styles.css" rel="stylesheet" />
    <link href="https://cdn.masastack.com/npm/@mdi/font@7.1.96/css/materialdesignicons.min.css" rel="stylesheet">
    <link href="https://cdn.masastack.com/npm/materialicons/materialicons.css" rel="stylesheet">
    <link href="https://cdn.masastack.com/npm/fontawesome/v5.0.13/css/all.css" rel="stylesheet">
    <style>
        #app .m-app-bar {
            -webkit-app-region: drag;
        }

        html {
            overflow: hidden;
        }
    </style>
</head>

<body>

    <div class="status-bar-safe-area"></div>
    <div id="app">Loading...</div>

    <div id="blazor-error-ui">
        An unhandled error has occurred.
        <a href="" class="reload">Reload</a>
        <a class="dismiss">🗙</a>
    </div>

    <script src="_framework/blazor.webview.js"></script>
    <script src="_content/BlazorComponent/js/blazor-component.js"></script>

    <script>
        let start = false;
        let pageX = 0;
        let pageY = 0;
        document.body.addEventListener('mousedown', evt => {
            const { target } = evt;
            const appRegion = getComputedStyle(target)['-webkit-app-region'];
            const app = document.getElementById("m-app-bar");
            app.addEventListener('mousemove', onmousemove)

            app.addEventListener("mousedown", (e) => {
                console.log(e.pageX, e.pageY);
                pageX = e.pageX;
                pageY = e.pageY;
                start = true;
            })

            app.addEventListener("mouseup", (e) => {
                start = false;
            })

            console.log("MouseDownDrag", evt, appRegion, app);
            if (appRegion === 'drag') {
                var data = {
                    Command: "MouseMove",
                    Data: {

                    }
                }
                evt.preventDefault();
                evt.stopPropagation();
            }
        });

        function onmousemove(e) {
            if (start) {
                console.log("MouseMove", e);
                var data = {
                    "Command": "MouseMove",
                    X: e.clientX - pageX,
                    Y: e.clientY - pageY
                }
                window.external.sendMessage(JSON.stringify(data));
            }

        }

    </script>
</body>

</html>

主要是添加了这个样式文件，注意的是这个相当于标记了哪个可以拖动我们的窗口的标记

    <style>
        #app .m-app-bar {
            -webkit-app-region: drag;
        }

        html {
            overflow: hidden;
        }
    </style>

下面的js的代码是为了传递窗口拖动参数实现实际的拖动

    <script>
        let start = false;
        let pageX = 0;
        let pageY = 0;
        document.body.addEventListener('mousedown', evt => {
            const { target } = evt;
            const appRegion = getComputedStyle(target)['-webkit-app-region'];
            const app = document.getElementById("m-app-bar");
            app.addEventListener('mousemove', onmousemove)

            app.addEventListener("mousedown", (e) => {
                console.log(e.pageX, e.pageY);
                pageX = e.pageX;
                pageY = e.pageY;
                start = true;
            })

            app.addEventListener("mouseup", (e) => {
                start = false;
            })

            console.log("MouseDownDrag", evt, appRegion, app);
            if (appRegion === 'drag') {
                var data = {
                    Command: "MouseMove",
                    Data: {

                    }
                }
                evt.preventDefault();
                evt.stopPropagation();
            }
        });
        function onmousemove(e) {
            if (start) {
                console.log("MouseMove", e);
                var data = {
                    "Command": "MouseMove",
                    X: e.clientX - pageX,
                    Y: e.clientY - pageY
                }
                window.external.sendMessage(JSON.stringify(data));
            }
        }

    </script>

修改Program.cs文件的代码支持拖动

using System.Diagnostics;
using Gotrays;
using Microsoft.Extensions.DependencyInjection;
using Photino.Blazor;
using PhotinoNET;
using System.Runtime.InteropServices;
using System.Text.Json;

internal class Program
{
    [STAThread]
    private static void Main(string[] args)
    {
        var appBuilder = PhotinoBlazorAppBuilder.CreateDefault(args);

        appBuilder.RootComponents.Add<App>("#app");
        appBuilder.Services.AddMasaBlazor();

        var app = appBuilder.Build();

        app.MainWindow

            .SetTitle("Photino Blazor Sample")
            .SetChromeless(true)
            .RegisterWebMessageReceivedHandler(MessageReceived);

        AppDomain.CurrentDomain.UnhandledException += (sender, error) =>
        {
        };

        app.Run();
    }

    private static void MessageReceived(object? sender, string message)
    {
        var window = sender as PhotinoWindow;
        if (message.StartsWith("{"))
        {
            var data = JsonSerializer.Deserialize<Message>(message);

            if (data == null || data.Command != "MouseMove") return;

            var left = window.Left + data.X;
            var top = window.Top + data.Y;
            if (left <= -window.Width / 2)
            {
                left = -window.Width / 2;
            }

            if (window.Top < 0)
            {
                window.Top = 0;
            }

            window.SetLeft((int)((int)left));
            window.SetTop((int)((int)top));
        }
    }

}

public class Message
{
    public string Command { get; set; }

    public double X { get; set; }

    public double Y { get; set; }
}

代码实现逻辑

首先需要定义css样式，这个是相当于指定了哪个元素可以被拖动
```
#app .m-app-bar {
            -webkit-app-region: drag;
        }
```

然后定义js脚本，通过js去监听拖动的事件然后计算坐标，将计算好的坐标传递到c#的事件中完成实际的窗体拖动事件

        let start = false;
        let pageX = 0;
        let pageY = 0;
        document.body.addEventListener('mousedown', evt => {
            const { target } = evt;
            const appRegion = getComputedStyle(target)['-webkit-app-region'];
            const app = document.getElementById("m-app-bar");
            app.addEventListener('mousemove', onmousemove)

            app.addEventListener("mousedown", (e) => {
                pageX = e.pageX;
                pageY = e.pageY;
                start = true;
            })

            app.addEventListener("mouseup", (e) => {
                start = false;
            })

            if (appRegion === 'drag') {
                var data = {
                    Command: "MouseMove",
                    Data: {

                    }
                }
                evt.preventDefault();
                evt.stopPropagation();
            }
        });
        function onmousemove(e) {
            if (start) {
                console.log("MouseMove", e);
                var data = {
                    "Command": "MouseMove",
                    X: e.clientX - pageX,
                    Y: e.clientY - pageY
                }
                window.external.sendMessage(JSON.stringify(data));
            }
        }

当id为m-app-bar的元素被鼠标按下的时候对于pageX = e.pageX，pageY = e.pageY，start = true三个值赋值，start 表示鼠标按下并且启动拖动，pageX和pageY则是鼠标首次按下坐标

当元素被mousedown触发将拖动的坐标和首次点击的坐标相减，然后就可以通过window.external.sendMessage传递到c#的代码块中，先判断Message的数据是否为json，如果是则转换模型，然后计算设置实际窗体的位置即可

    private static void MessageReceived(object? sender, string message)
    {
        var window = sender as PhotinoWindow;
        if (message.StartsWith("{"))
        {
            var data = JsonSerializer.Deserialize<Message>(message);

            if (data == null || data.Command != "MouseMove") return;

            var left = window.Left + data.X;
            var top = window.Top + data.Y;
            if (left <= -window.Width / 2)
            {
                left = -window.Width / 2;
            }

            if (window.Top < 0)
            {
                window.Top = 0;
            }

            window.SetLeft((int)((int)left));
            window.SetTop((int)((int)top));
        }
    }

效果

结尾

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