WPF案例:如何设计搜索框(自定义控件的原则和方法)

2016-08-20 10:36:20来源:http://muzizongheng.blog.51cto.com/856912/1332943作者:muzizongheng人点击


我们平时自定义WPF控件的方法有:Style,DataTemplate,ControlTemplate, DependencyProperty, CustomControl等几个方法。按照优先顺序应该是从左到右。(所谓Style,这里仅包括Setter)

对于搜索框,其组成也就是TextBox+Button(清空),这里我们用CustomControl的方法比较合适。
1.创建SearchBox继承于TextBox,并声明2个Part属性, 表明此控件组成 [TemplatePart(Name = "PART_SearchTextBox", Type = typeof(TextBox))] [TemplatePart(Name = "PART_ClearButton", Type = typeof(Button))]public class SearchBox : TextBox 2.创建2个子控件的Style, 注意ControlTemplate中的子控件命名和上述属性声明一致 <Style TargetType="{x:Type local:SearchBox}"><Setter Property="Template"><Setter.Value> <ControlTemplate TargetType="{x:Type local:SearchBox}"><!-------------子控件PART_SearchTextBox,PART_ClearButton及其它设置---------------> </ControlTemplate></Setter.Value></Setter></Style> 3.如果在当前程序集里,必须放在./Themes文件夹下; 必须在程序集的AssemblyInfo.cs里指定ThemeInfo(用来指定控件默认Style) [assembly: ThemeInfo( ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located //(used if a resource is not found in the page,// or application resource dictionaries) ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located //(used if a resource is not found in the page,// app, or any theme specific resource dictionaries) )] 4.在自定义控件的实现中注册路由事件等等其它逻辑处理 比如:对子元素Clear按钮进行处理public override void OnApplyTemplate() { base.OnApplyTemplate(); Button btnClear = base.GetTemplateChild("PART_ClearButton") as Button; if (btnClear != null) {btnClear.Click += new RoutedEventHandler(OnClearButton_Click); } } private void OnClearButton_Click(Object sender, RoutedEventArgs e) { TextBox txtSearch = base.GetTemplateChild("PART_SearchTextBox") as TextBox; if (txtSearch!= null) {txtSearch.Text = String.Empty;txtSearch.Focus(); } }

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