103 lines
3.9 KiB
C#
103 lines
3.9 KiB
C#
using MaxwellFramework.Core.Common.Command;
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using MwFramework.Controls.Components;
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using Stylet;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Input;
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using DelegateCommand = MwFramework.Controls.Components.DelegateCommand;
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namespace MainShell.Resources.CustomControl
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{
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public class PaginationViewModel : PropertyChangedBase
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{
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private int _currentPage = 1;
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private int _pageSize = 20;
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private int _totalItems;
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private int _jumpPage = 1; // 新增跳转页字段
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public List<int> PageSizeOptions { get; } = new List<int> { 20, 50, 100, 200 };
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public int CurrentPage
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{
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get => _currentPage;
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set
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{
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int validated = Math.Max(1, Math.Min(value, TotalPages == 0 ? 1 : TotalPages));
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if (SetAndNotify(ref _currentPage, validated))
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{
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JumpPage = validated; // 页面变更时同步更新跳转输入框数值
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PageChanged?.Invoke(this, EventArgs.Empty);
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// 关键：通知命令状态刷新
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(MoveFirstCommand as DelegateCommand)?.RaiseCanExecuteChanged();
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(MoveBackCommand as DelegateCommand)?.RaiseCanExecuteChanged();
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(MoveNextCommand as DelegateCommand)?.RaiseCanExecuteChanged();
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(MoveLastCommand as DelegateCommand)?.RaiseCanExecuteChanged();
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}
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}
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}
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// 新增跳转页属性
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public int JumpPage
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{
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get => _jumpPage;
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set
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{
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if (SetAndNotify(ref _jumpPage, value))
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{
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// 输入变化时刷新跳转按钮状态
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(JumpToPageCommand as DelegateCommand)?.RaiseCanExecuteChanged();
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}
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}
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}
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public int PageSize
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{
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get => _pageSize;
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set
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{
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if (SetAndNotify(ref _pageSize, value))
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{
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OnPropertyChanged(nameof(TotalPages));
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CurrentPage = 1; // 内部会触发 PageChanged
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PageChanged?.Invoke(this, EventArgs.Empty);
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(JumpToPageCommand as DelegateCommand)?.RaiseCanExecuteChanged();
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}
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}
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}
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public int TotalItems
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{
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get => _totalItems;
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set
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{
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if (SetAndNotify(ref _totalItems, value))
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{
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OnPropertyChanged(nameof(TotalPages));
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// 刷新命令状态，防止数据更新后按钮不可用
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(MoveNextCommand as DelegateCommand)?.RaiseCanExecuteChanged();
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(MoveLastCommand as DelegateCommand)?.RaiseCanExecuteChanged();
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(JumpToPageCommand as DelegateCommand)?.RaiseCanExecuteChanged();
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}
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}
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}
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public int TotalPages => (int)Math.Ceiling((double)_totalItems / Math.Max(1, _pageSize));
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// 优化后的命令，增加了 CanExecute 判断
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public ICommand MoveFirstCommand => new DelegateCommand(() => CurrentPage = 1, () => CurrentPage > 1);
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public ICommand MoveBackCommand => new DelegateCommand(() => CurrentPage--, () => CurrentPage > 1);
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public ICommand MoveNextCommand => new DelegateCommand(() => CurrentPage++, () => CurrentPage < TotalPages);
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public ICommand MoveLastCommand => new DelegateCommand(() => CurrentPage = TotalPages, () => CurrentPage < TotalPages);
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// 新增跳转命令
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public ICommand JumpToPageCommand => new DelegateCommand(
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() => CurrentPage = JumpPage,
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() => JumpPage >= 1 && JumpPage <= TotalPages);
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public event EventHandler PageChanged;
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}
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}
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