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>
- 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:
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