WPF 自定义分页控件 ---- DataPager

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mb5ff9827b65e5b 2020-03-24 18:57:00

文章标签 分页数据控件初始化预处理 文章分类 代码人生

最近在项目中遇到远程加载数据的问题,由于服务器采用分页方式返回数据,因此客户端也相应的制作了一个分页控件.代码相对简单,算做入门级的源码.

效果如图:

WPF 自定义分页控件 ---- DataPager_数据

初步分析,分页功能只需要3个核心变量:PageIndex,PageSize,TotalCount,2个事件:PageChanging,PageChanged,1个方法InitData.

PageIndex:记录当前所在页

PageSize:记录每页显示的条目数

TotalCount:条目总数

由TotalCount和PageSize可以得到PageCount

PageChanging事件作为分页的预处理事件,修改事件参数PageChangingEventArgs的IsCancel属性可以取消分页,这个是参考其他分页控件的属性

PageChanged事件是分页后的处理事件,应用程序可以在此时获取PageIndex进行操作.

InitData方法在数据加载时调用(主要是TotalCount属性),用于初始化上面提到的核心变量.

WPF提供了很强大和实用的Binding功能,在开发控件时,应该尽量把属性设计成依赖属性.因此我把PageIndex,PageSize,TotalCount属性全部设计成依赖属性,并注册了部分回调方法.这样也可以很方便的实现控件和ViewModel的绑定.

核心代码如下:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246	`///` `/// DataPager.xaml 的交互逻辑` `///` `public` `partial` `class` `DataPager : UserControl, INotifyPropertyChanged` `{` `public` `DataPager()` `{` `InitializeComponent();` `}` `///` `/// 分页前处理的事件,如果设置e.IsCancel=True将取消分页` `///` `public` `event` `PageChangingRouteEventHandler PageChanging;` `///` `/// 分页后处理的事件` `///` `public` `event` `PageChangedRouteEventHandler PageChanged;` `#region 依赖属性` `///` `/// 当前页` `///` `public` `int` `PageIndex` `{` `get` `{` `return` `(``int``)GetValue(PageIndexProperty); }` `set` `{ SetValue(PageIndexProperty, value); }` `}` `// Using a DependencyProperty as the backing store for CurrentPage. This enables animation, styling, binding, etc...` `public` `static` `readonly` `DependencyProperty PageIndexProperty =` `DependencyProperty.Register(``"PageIndex"``,` `typeof``(``int``),` `typeof``(DataPager),` `new` `UIPropertyMetadata(1, (sender, e) =>` `{` `var` `dp = sender` `as` `DataPager;` `dp.ChangeNavigationButtonState();` `}));` `///` `/// 每页显示数据大小` `///` `public` `int` `PageSize` `{` `get` `{` `return` `(``int``)GetValue(PageSizeProperty); }` `set` `{ SetValue(PageSizeProperty, value); InitData(); }` `}` `// Using a DependencyProperty as the backing store for PageSize. This enables animation, styling, binding, etc...` `public` `static` `readonly` `DependencyProperty PageSizeProperty =` `DependencyProperty.Register(``"PageSize"``,` `typeof``(``int``),` `typeof``(DataPager),` `new` `UIPropertyMetadata(20, (sender, e) =>` `{` `var` `dp = sender` `as` `DataPager;` `if` `(dp ==` `null``)` `return``;` `dp.ChangeNavigationButtonState();` `}));` `///` `/// 记录数量` `///` `public` `int` `TotalCount` `{` `get` `{` `return` `(``int``)GetValue(TotalCountProperty); }` `set` `{` `SetValue(TotalCountProperty, value);` `}` `}` `// Using a DependencyProperty as the backing store for TotalCount. This enables animation, styling, binding, etc...` `public` `static` `readonly` `DependencyProperty TotalCountProperty =` `DependencyProperty.Register(``"TotalCount"``,` `typeof``(``int``),` `typeof``(DataPager),` `new` `UIPropertyMetadata(0, (sender, e) =>` `{` `var` `dp = sender` `as` `DataPager;` `if` `(dp ==` `null``)` `return``;` `dp.InitData();` `dp.ChangeNavigationButtonState();` `}));` `///` `/// 总页数` `///` `public` `int` `PageCount` `{` `get` `{` `return` `(``int``)GetValue(PageCountProperty); }` `private` `set` `{ SetValue(PageCountProperty, value); }` `}` `// Using a DependencyProperty as the backing store for PageCount. This enables animation, styling, binding, etc...` `public` `static` `readonly` `DependencyProperty PageCountProperty =` `DependencyProperty.Register(``"PageCount"``,` `typeof``(``int``),` `typeof``(DataPager),` `new` `UIPropertyMetadata(1));` `///` `/// 是否可以点击首页和上一页按钮` `///` `public` `bool` `CanGoFirstOrPrev` `{` `get` `{` `if` `(PageIndex <= 1)` `return` `false``;` `return` `true``;` `}` `}` `///` `/// 是否可以点击最后页和下一页按钮` `///` `public` `bool` `CanGoLastOrNext` `{` `get` `{` `if` `(PageIndex >= PageCount)` `return` `false``;` `return` `true``;` `}` `}` `#endregion` `///` `/// 点击首页按钮` `///` `///` `///` `private` `void` `btnFirst_Click(``object` `sender, RoutedEventArgs e)` `{` `OnPageChanging(1);` `}` `///` `/// 点击上一页按钮` `///` `///` `///` `private` `void` `btnPrev_Click(``object` `sender, RoutedEventArgs e)` `{` `OnPageChanging(``this``.PageIndex - 1);` `}` `///` `/// 点击下一页按钮` `///` `///` `///` `private` `void` `btnNext_Click(``object` `sender, RoutedEventArgs e)` `{` `OnPageChanging(``this``.PageIndex + 1);` `}` `///` `/// 点击末页按钮` `///` `///` `///` `private` `void` `btnLast_Click(``object` `sender, RoutedEventArgs e)` `{` `OnPageChanging(``this``.PageCount);` `}` `///` `/// 点击跳转按钮` `///` `///` `///` `private` `void` `btnGoTo_Click(``object` `sender, RoutedEventArgs e)` `{` `int` `pageIndex = 1;` `try` `{` `pageIndex = Convert.ToInt32(txtPageIndex.Text);` `}` `catch` `{` `}` `finally` `{` `OnPageChanging(pageIndex);` `}` `}` `///` `/// 页码更改` `///` `///` `internal` `void` `OnPageChanging(``int` `pageIndex)` `{` `if` `(pageIndex < 1) pageIndex = 1;` `if` `(pageIndex >` `this``.PageCount) pageIndex =` `this``.PageCount;` `var` `oldPageIndex =` `this``.PageIndex;` `var` `newPageIndex = pageIndex;` `var` `eventArgs =` `new` `PageChangingEventArgs() { OldPageIndex = oldPageIndex, NewPageIndex = newPageIndex };` `if` `(``this``.PageChanging !=` `null``)` `{` `this``.PageChanging(``this``, eventArgs);` `}` `if` `(!eventArgs.IsCancel)` `{` `this``.PageIndex = newPageIndex;` `if` `(``this``.PageChanged !=` `null``)` `{` `this``.PageChanged.Invoke(``this``,` `new` `PageChangedEventArgs() { CurrentPageIndex =` `this``.PageIndex });` `}` `}` `}` `///` `/// 通知导航按钮(首页,上一页,下一页,末页)状态的更改` `///` `void` `ChangeNavigationButtonState()` `{` `this``.NotifyPropertyChanged(``"CanGoFirstOrPrev"``);` `this``.NotifyPropertyChanged(``"CanGoLastOrNext"``);` `}` `///` `/// 初始化数据` `///` `void` `InitData()` `{` `if` `(``this``.TotalCount == 0)` `{` `this``.PageCount = 1;` `}` `else` `{` `this``.PageCount =` `this``.TotalCount %` `this``.PageSize > 0 ? (``this``.TotalCount /` `this``.PageSize) + 1 :` `this``.TotalCount /` `this``.PageSize;` `}` `if` `(``this``.PageIndex < 1)` `{` `this``.PageIndex = 1;` `}` `if` `(``this``.PageIndex >` `this``.PageCount)` `{` `this``.PageIndex =` `this``.PageCount;` `}` `if` `(``this``.PageSize < 1)` `{` `this``.PageSize = 20;` `}` `}` `#region INotifyPropertyChanged成员` `public` `event` `PropertyChangedEventHandler PropertyChanged;` `public` `void` `NotifyPropertyChanged(``string` `propertyName)` `{` `if` `(``this``.PropertyChanged !=` `null``)` `{` `this``.PropertyChanged.Invoke(``this``,` `new` `PropertyChangedEventArgs(propertyName));` `}` `}` `#endregion` `}`

Xaml中使用如下:

<my:DataPager PageChanged="dataPager1_PageChanged" PageChanging="dataPager1_PageChanging" TotalCount="{Binding TotalCount}" PageSize="20" PageIndex="{Binding PageIndex}" x:Name="dataPager1" VerticalAlignment="Top" />

源码下载

注意：在使用MVVM框架的情况下，如果在vm里获取分页相关的数据，需要使用双向绑定，比如：PageIndex="{Binding PageIndex,Mode=TwoWay}"

出处：javascript:void(0)

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