Blazor实现微信的Tab切换功能

是否有小伙伴在使用tab的时候想进行滑动切换Tab?

并且有滑动左出左进,右出右进的效果 ,本文将讲解怎么在Blazor中去通过滑动切换Tab

本文中的UI组件使用的是MASA Blazor,您也可以是其他的UI框架,这个并不影响实际的运行效果,本文案例是兼容PC和Android的,演示效果是android中执行的,在PC中执行效果依然有效(亲测)

首先安装MASA Blazor 根据 MASA Blazor安装MASA Blazor

准备工作

  • 创建 AppBar.razor文件
  • 修改MainLayout.razor文件代码
@inherits LayoutComponentBase

<MApp>
    <AppBar>
        <div class="body">
            @Body
        </div>
    </AppBar>
</MApp>

<style>
.body {
    /*设置内容高度 需要减去导航栏的高度*/
    height: calc(100vh - 48px);
    max-height: calc(100vh - 48px);
}
</style>

创建 AppBar.razor.css 文件并且添加相关代码 ,以下代码是为了实现切换的时候有一个出入效果,具体代码案例来自Animista - On-Demand CSS Animations Library

/*左边滑动出*/
.slide-out-left {
    -webkit-animation: slide-out-left 0.5s;
    animation: slide-out-left 0.5s;
}

/*右边滑动出*/
.slide-out-right {
    -webkit-animation: slide-out-right 0.5s;
    animation: slide-out-right 0.5s;
}

/*右边滑动进*/
.slide-in-right {
    -webkit-animation: slide-in-right 0.5s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
    animation: slide-in-right 0.5s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
}

/*左边滑动进*/
.slide-in-left {
    -webkit-animation: slide-in-left 0.5s;
    animation: slide-in-left 0.5s;
}

@-webkit-keyframes slide-out-left {
    0% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }

    100% {
        -webkit-transform: translateX(-1000px);
        transform: translateX(-1000px);
        opacity: 0;
    }
}

@keyframes slide-out-left {
    0% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }

    100% {
        -webkit-transform: translateX(-1000px);
        transform: translateX(-1000px);
        opacity: 0;
    }
}


@-webkit-keyframes slide-out-right {
    0% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }

    100% {
        -webkit-transform: translateX(1000px);
        transform: translateX(1000px);
        opacity: 0;
    }
}

@keyframes slide-out-right {
    0% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }

    100% {
        -webkit-transform: translateX(1000px);
        transform: translateX(1000px);
        opacity: 0;
    }
}


@-webkit-keyframes slide-in-left {
    0% {
        -webkit-transform: translateX(-1000px);
        transform: translateX(-1000px);
        opacity: 0;
    }

    100% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slide-in-left {
    0% {
        -webkit-transform: translateX(-1000px);
        transform: translateX(-1000px);
        opacity: 0;
    }

    100% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }
}
@-webkit-keyframes slide-in-right {
    0% {
        -webkit-transform: translateX(1000px);
        transform: translateX(1000px);
        opacity: 0;
    }

    100% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slide-in-right {
    0% {
        -webkit-transform: translateX(1000px);
        transform: translateX(1000px);
        opacity: 0;
    }

    100% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
        opacity: 1;
    }
}

创建AppBar的模型用于动态添加导航栏, 创建AppBarDto.cs文件并添加相关代码

public class AppBarDto
{
    public string Key { get; set; }

    /// <summary>
    /// 标题
    /// </summary>
    public string Title { get; init; }

    /// <summary>
    /// 图标
    /// </summary>
    public string? Icon { get; set; }

    /// <summary>
    /// 路由
    /// </summary>
    public string Href { get; init; }

    public AppBarDto(string title, string href, string? icon = null)
    {
        Title = title;
        Icon = icon;
        Href = href;
        Key = Guid.NewGuid().ToString("N");
    }
}

添加相关页面,在Pages文件夹下,分别创建Index.razor,Feature.razor,Friend.razor,PersonalCenter.razor

文件相关代码:
Index.razor

@page "/"
<h3>Index</h3>

Feature.razor

@page "/feature"
<h3>Feature</h3>

Friend.razor

@page "/friend"
<h3>Friend</h3>

PersonalCenter.razor

@page "/personal-center"
<h3>PersonalCenter</h3>

@page "/personal-center"
<h3>PersonalCenter</h3>

修改AppBar.razor代码

<div class="@Class" @ontouchstart="TouchStart" @ontouchend="TouchEnd" @onmousedown="Mousedown" @onmouseup="Mouseup" style="height: 100%">
    @ChildContent
</div>

 @*这里也可以是其他组件的Tab,其实只是记录当前的导航的数据*@
<MTabs Centered
       BackgroundColor="indigo"
       ShowArrows="false"
       Value="selectModel.Key"
       Dark>
    @foreach (var i in AppBars)
    {
        <MTab Value="i.Key" OnClick="()=>GoHref(i)">
            @if (!string.IsNullOrEmpty(i.Icon))
            {
                <MIcon Dark>@i.Icon</MIcon>
            }
            @i.Title
        </MTab>
    }
</MTabs>

创建AppBar.razor.cs 添加以下代码

public partial class AppBar
{
    #region Inject

    [Inject]
    public required NavigationManager NavigationManager { get; set; }

    #endregion

    private readonly List<AppBarDto> AppBars = new();

    [Parameter]
    public RenderFragment ChildContent { get; set; }

    private AppBarDto selectModel;

    private string Class { get; set; }

    protected override void OnInitialized()
    {
        AppBars.Add(new AppBarDto("首页", "/", "home"));
        AppBars.Add(new AppBarDto("好友", "/personal-center", "mdi-account-group-outline"));
        AppBars.Add(new AppBarDto("功能", "/feature", "mdi-wrench"));
        AppBars.Add(new AppBarDto("个人中心", "/personal-center", "mdi-badge-account-alert"));

        // 默认选择的导航标签
        selectModel = AppBars[0];

        base.OnInitialized();
    }

    /// <summary>
    /// 导航栏跳转
    /// </summary>
    /// <param name="appBar"></param>
    private void GoHref(AppBarDto appBar)
    {
        // 防止重复点击
        if(appBar == selectModel)
        {
            return;
        }

        // 当点击导航的索引大于现在导航时启动滑动效果
        if(AppBars.IndexOf(appBar) > AppBars.IndexOf(selectModel))
        {
            Class = "slide-out-left";
            Task.Run(async () =>
            {
                // 由于特效时间为0.5s 这里是等待特效完成
                await Task.Delay(450);
                NavigationManager.NavigateTo(selectModel.Href);
                Class = "slide-in-right";
                _ = InvokeAsync(StateHasChanged);
            });
        }
        // 当点击导航的索引小于现在导航时启动滑动效果
        else if (AppBars.IndexOf(appBar) < AppBars.IndexOf(selectModel))
        {
            Class = "slide-out-right";
            Task.Run(async () =>
            {
                // 由于特效时间为0.5s 这里是等待特效完成
                await Task.Delay(450);
                NavigationManager.NavigateTo(selectModel.Href);
                Class = "slide-in-left";
                _ = InvokeAsync(StateHasChanged);
            });
        }
        selectModel = appBar;
        NavigationManager.NavigateTo(appBar.Href);
    }


    /// <summary>
    /// 开始X坐标
    /// </summary>
    private double _startX;


    #region 移动端滑动处理

    /// <summary>
    /// 记录开始坐标
    /// </summary>
    /// <param name="args"></param>
    private void TouchStart(TouchEventArgs args)
    {
        var touch = args.ChangedTouches[0];
        _startX = touch.ScreenX;
    }

    private void TouchEnd(TouchEventArgs args)
    {
        var touch = args.ChangedTouches[0];
        Switchover((decimal)touch.ScreenX);
    }

    #endregion

    #region PC滑动处理

    /// <summary>
    /// 记录开始坐标
    /// </summary>
    /// <param name="args"></param>
    private void Mousedown(MouseEventArgs args)
    {
        _startX = args.ScreenX;
    }

    private void Mouseup(MouseEventArgs args)
    {
        Switchover((decimal)args.ScreenX);
    }

    #endregion

    private void Switchover(decimal screenX)
    {
        var index = AppBars.IndexOf(selectModel);
        // 限制过度滑动
        if (index == AppBars.Count || index > AppBars.Count)
        {
            return;
        }

        // 设置滑动最大位限制,达到这个限制才滑动生效
        var size = 200;

        // 需要滑动200才切换 如果开始坐标x大于 当前结束的x坐标往右边切换tab
        if ((decimal)_startX - size > screenX)
        {
            // 如果右边往左边滑动 当前索引是当前最大数量的话不需要切换
            if (index == AppBars.Count - 1)
            {
                return;
            }
            selectModel = AppBars[index + 1];
            Class = "slide-out-left";

            Task.Run(async () =>
            {
                // 由于特效时间为0.5s 这里是等待特效完成
                await Task.Delay(450);
                NavigationManager.NavigateTo(selectModel.Href);
                Class = "slide-in-right";
                _ = InvokeAsync(StateHasChanged);
            });
        }
        else if ((decimal)_startX + size < screenX)
        {
            // 如果左边往右边滑动 当前索引是0的话不需要切换
            if (index == 0)
            {
                return;
            }
            selectModel = AppBars[index - 1];
            Class = "slide-out-right";
            Task.Run(async () =>
            {
                // 由于特效时间为0.5s 这里是等待特效完成
                await Task.Delay(450);
                NavigationManager.NavigateTo(selectModel.Href);
                Class = "slide-in-left";
                _ = InvokeAsync(StateHasChanged);
            });
        }
    }
}

运行效果:

到此这篇关于Blazor实现微信的Tab切换功能的文章就介绍到这了,更多相关Blazor实现微信Tab切换内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持!

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发布时间 2023-01-23 18:01:06
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