wpf下拉控件类源码

示例不完整，仅含控件类源码

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;using System.Collections;namespace dropdownTextBoxApp{ /// <summary> /// 按照步骤 1a 或 1b 操作，然后执行步骤 2 以在 XAML 文件中使用此自定义控件。 /// /// 步骤 1a) 在当前项目中存在的 XAML 文件中使用该自定义控件。 /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根 /// 元素中: /// /// xmlns:MyNamespace="clr-namespace:dropdownTextBoxApp" /// /// /// 步骤 1b) 在其他项目中存在的 XAML 文件中使用该自定义控件。 /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根 /// 元素中: /// /// xmlns:MyNamespace="clr-namespace:dropdownTextBoxApp;assembly=dropdownTextBoxApp" /// /// 您还需要添加一个从 XAML 文件所在的项目到此项目的项目引用， /// 并重新生成以避免编译错误: /// /// 在解决方案资源管理器中右击目标项目，然后依次单击 /// “添加引用”->“项目”->[浏览查找并选择此项目] /// /// /// 步骤 2) /// 继续操作并在 XAML 文件中使用控件。 /// /// <MyNamespace:DropdownTextBox/> /// /// </summary> public class DropdownTextBox : Control { static DropdownTextBox() { DefaultStyleKeyProperty.OverrideMetadata(typeof(DropdownTextBox), new FrameworkPropertyMetadata(typeof(DropdownTextBox))); } #region 属性 /*----------------------------------------------------------------*/ public static readonly DependencyProperty IsDropdownOpenedProperty = DependencyProperty.Register("IsDropdownOpened", typeof(bool), typeof(DropdownTextBox), new FrameworkPropertyMetadata(new PropertyChangedCallback(IsDropdownOpenedPropertyChanged))); /// <summary> /// 下拉框是否已打开 /// </summary> public bool IsDropdownOpened { get { return (bool)GetValue(IsDropdownOpenedProperty); } set { SetValue(IsDropdownOpenedProperty, value); } } private static void IsDropdownOpenedPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { bool b = (bool)e.NewValue; DropdownTextBox db = d as DropdownTextBox; db.OnDropdownStateChanged(b); } protected virtual void OnDropdownStateChanged(bool isopened) { // 引发路由事件 RoutedEventArgs args = new RoutedEventArgs(); if (isopened) { args.RoutedEvent = DropdownOpenedEvent; } else { args.RoutedEvent = DropdownClosedEvent; } args.Source = this; RaiseEvent(args); } /*-------------------------------------------------------*/ public static readonly DependencyProperty DropItemsProperty = DependencyProperty.Register("DropItems", typeof(IEnumerable), typeof(DropdownTextBox), new FrameworkPropertyMetadata(new PropertyChangedCallback(DropItemsPropertyChanged))); /// <summary> /// 获取或设置下拉框中显示的项 /// </summary> public IEnumerable DropItems { get { return (IEnumerable)GetValue(DropItemsProperty); } set { SetValue(DropItemsProperty, value); } } private static void DropItemsPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DropdownTextBox dt = d as DropdownTextBox; if (dt != null) { IEnumerable oldval, newval; oldval = (IEnumerable)e.OldValue; newval = (IEnumerable)e.NewValue; dt.OnDropItemsChanged(oldval, newval); } } protected virtual void OnDropItemsChanged(IEnumerable oldItems, IEnumerable newItems) { if (oldItems != newItems) { this.UpdateUIItems(newItems); } } /*------------------------------------------------------*/ public static readonly DependencyProperty MinDropdownHeightProperty = DependencyProperty.Register("MinDropdownHeighte", typeof(double), typeof(DropdownTextBox)); /// <summary> /// 下拉列表框的最小高度 /// </summary> public double MinDropdownHeighte { get { return (double)GetValue(MinDropdownHeightProperty); } set { SetValue(MinDropdownHeightProperty, value); } } /*--------------------------------------------------------------*/ public static readonly DependencyProperty MaxDropdownHeightProperty = DependencyProperty.Register("MaxDropdownHeight", typeof(double), typeof(DropdownTextBox)); /// <summary> /// 下拉列表框的最大高度 /// </summary> public double MaxDropdownHeight { get { return (double)GetValue(MaxDropdownHeightProperty); } set { SetValue(MaxDropdownHeightProperty, value); } } /*----------------------------------------------------------*/ public static readonly DependencyProperty TextProperty = TextBox.TextProperty.AddOwner(typeof(DropdownTextBox),new FrameworkPropertyMetadata(new PropertyChangedCallback(TextPropertyChanged))); private static void TextPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DropdownTextBox db = d as DropdownTextBox; db.OnTextChanged(); } /// <summary> /// 获取或设置控件中显示的文本 /// </summary> public string Text { get { return (string)GetValue(TextProperty); } set { SetValue(TextProperty, value); } } #endregion #region 字段 /// <summary> /// 文本输入框 /// </summary> private TextBox m_InputBox = null; /// <summary> /// 模板中文本框控件的名字 /// </summary> const string PART_InputBox = "PART_InputBox"; /// <summary> /// 显示项的面板 /// </summary> const string PART_ItemPanel = "PART_ItemPanel"; /// <summary> /// 显示项的面板 /// </summary> private Panel m_itemsPanel = null; #endregion #region 内部方法 /// <summary> /// 创建项容器 /// </summary> /// <returns></returns> protected virtual UIElement CreateItemContainer() { DropdownItem ue = new DropdownItem(); AddItemActivedHandler(ue, new RoutedEventHandler(Item_Actived)); return ue; } private void Item_Actived(object sender, RoutedEventArgs e) { if (m_InputBox == null) return; DropdownItem item = e.Source as DropdownItem; if (item != null) { string str = item.NormalText; m_InputBox.Tag = true; m_InputBox.Text = str; m_InputBox.Tag = false; IsDropdownOpened = false; } } protected virtual void ClearAllItems() { if (m_itemsPanel != null) { m_itemsPanel.Children.Clear(); } } /// <summary> /// 更新项列表UI /// </summary> private void UpdateUIItems(IEnumerable items) { if (m_itemsPanel != null) { ClearAllItems(); if (items != null) { foreach (object item in items) { string strContent = string.Empty; if (item is string) strContent = item as string; else strContent = item.ToString(); UIElement ui = CreateItemContainer(); ui.SetValue(DropdownItem.NormalTextProperty, strContent); m_itemsPanel.Children.Add(ui); } m_itemsPanel.UpdateLayout(); //m_itemsPanel.InvalidateMeasure(); //m_itemsPanel.InvalidateArrange(); } } } /// <summary> /// 高亮显示字符 /// </summary> /// <param name="txt"></param> private void FilterText(string txt) { if (m_itemsPanel != null) { foreach (UIElement ue in m_itemsPanel.Children) { ue.SetValue(DropdownItem.FilterTextProperty, txt); } } } /*--------------------------------------------------------------------*/ public override void OnApplyTemplate() { if (m_InputBox != null) { m_InputBox.TextChanged -= m_InputBox_TextChanged; m_InputBox = null; } m_InputBox = GetTemplateChild(PART_InputBox) as TextBox; if (m_InputBox != null) m_InputBox.Tag = false; m_InputBox.TextChanged = m_InputBox_TextChanged; if (m_itemsPanel != null) { m_itemsPanel = null; } m_itemsPanel = GetTemplateChild(PART_ItemPanel) as VirtualizingStackPanel; if (m_itemsPanel != null) { UpdateUIItems(DropItems); } base.OnApplyTemplate(); } void m_InputBox_TextChanged(object sender, TextChangedEventArgs e) { bool b = (bool)m_InputBox.Tag; if (b == false) { if (IsDropdownOpened == false) { IsDropdownOpened = true; } } FilterText(m_InputBox.Text); // 引发本类的TextChanged事件 //OnTextChanged(e); } protected virtual void OnTextChanged() { RoutedEventArgs args = new RoutedEventArgs(TextChangedEvent, this); RaiseEvent(args); } #endregion #region 事件 public static readonly RoutedEvent ItemActivedEvent = EventManager.RegisterRoutedEvent("ItemActived", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(DropdownTextBox)); public static void AddItemActivedHandler(DependencyObject d, RoutedEventHandler handler) { UIElement u = d as UIElement; if (u != null) { u.AddHandler(ItemActivedEvent, handler); } } public static void RemoveItemActivedHandler(DependencyObject d, RoutedEventHandler handler) { UIElement u = d as UIElement; if (u != null) { u.RemoveHandler(ItemActivedEvent, handler); } } /*-------------------------------------------------------------------*/ public static readonly RoutedEvent TextChangedEvent = EventManager.RegisterRoutedEvent("TextChanged", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(DropdownTextBox)); /// <summary> /// 当文本框中的内容改变时发生 /// </summary> public event TextChangedEventHandler TextChanged { add { AddHandler(TextChangedEvent, value); } remove { RemoveHandler(TextChangedEvent, value); } } /*---------------------------------------------------*/ public static readonly RoutedEvent DropdownOpenedEvent = EventManager.RegisterRoutedEvent("DropdownOpened", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(DropdownTextBox)); /// <summary> /// 当下拉框打下后发生 /// </summary> public event RoutedEventHandler DropdownOpened { add { AddHandler(DropdownOpenedEvent, value); } remove { RemoveHandler(DropdownOpenedEvent, value); } } /*---------------------------------------------------------*/ public static readonly RoutedEvent DropdownClosedEvent = EventManager.RegisterRoutedEvent("DropdownClosed", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(DropdownTextBox)); /// <summary> /// 当下拉框关闭后发生 /// </summary> public event RoutedEventHandler DropdownClosed { add { AddHandler(DropdownClosedEvent, value); } remove { RemoveHandler(DropdownClosedEvent, value); } } #endregion }}using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;namespace dropdownTextBoxApp{ /// <summary> /// 按照步骤 1a 或 1b 操作，然后执行步骤 2 以在 XAML 文件中使用此自定义控件。 /// /// 步骤 1a) 在当前项目中存在的 XAML 文件中使用该自定义控件。 /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根 /// 元素中: /// /// xmlns:MyNamespace="clr-namespace:dropdownTextBoxApp" /// /// /// 步骤 1b) 在其他项目中存在的 XAML 文件中使用该自定义控件。 /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根 /// 元素中: /// /// xmlns:MyNamespace="clr-namespace:dropdownTextBoxApp;assembly=dropdownTextBoxApp" /// /// 您还需要添加一个从 XAML 文件所在的项目到此项目的项目引用， /// 并重新生成以避免编译错误: /// /// 在解决方案资源管理器中右击目标项目，然后依次单击 /// “添加引用”->“项目”->[浏览查找并选择此项目] /// /// /// 步骤 2) /// 继续操作并在 XAML 文件中使用控件。 /// /// <MyNamespace:DropdownItem/> /// /// </summary> public class DropdownItem : Control { static DropdownItem() { DefaultStyleKeyProperty.OverrideMetadata(typeof(DropdownItem), new FrameworkPropertyMetadata(typeof(DropdownItem))); } #region 字段 public const string PART_Textpresenter = "PART_Textpresenter"; private TextBlock m_Textpresenter = null; const string TAG_NORMALTEXT = "Normaltext"; const string TAG_FILTERTEXT = "Filtertext"; #endregion #region 属性 public static readonly DependencyProperty NormalBrushProperty = DependencyProperty.Register("NormalBrush", typeof(Brush), typeof(DropdownItem), new FrameworkPropertyMetadata(new PropertyChangedCallback(NormalBrushChanged))); private static void NormalBrushChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DropdownItem ditem = d as DropdownItem; ditem.OnNormalBrushChanged(); } public Brush NormalBrush { get { return (Brush)GetValue(NormalBrushProperty); } set { SetValue(NormalBrushProperty, value); } } private void OnNormalBrushChanged() { if (m_Textpresenter != null) { foreach (var item in m_Textpresenter.Inlines) { string tag = item.Tag as string; if (tag.ToLower() == TAG_NORMALTEXT) { item.Foreground = NormalBrush ; } } } } /*-----------------------------------------------------------*/ public static readonly DependencyProperty FilterBrushProperty = DependencyProperty.Register("FilterBrush", typeof(Brush), typeof(DropdownItem), new FrameworkPropertyMetadata(new PropertyChangedCallback(FilterBrushChanged))); private static void FilterBrushChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DropdownItem dropitem = d as DropdownItem; dropitem.OnFilterBrushChanged(); } public Brush FilterBrush { get { return (Brush)GetValue(FilterBrushProperty); } set { SetValue(FilterBrushProperty, value); } } private void OnFilterBrushChanged() { if (m_Textpresenter != null) { foreach (var item in m_Textpresenter.Inlines) { string tag = item.Tag as string; if (tag == TAG_FILTERTEXT) { item.Foreground = FilterBrush; } } } } /*------------------------------------------------------------*/ public static readonly DependencyProperty NormalTextProperty = DependencyProperty.Register("NormalText", typeof(string), typeof(DropdownItem), new FrameworkPropertyMetadata(string.Empty, new PropertyChangedCallback(NormalTextChanged))); private static void NormalTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DropdownItem ditem = d as DropdownItem; if (e.NewValue != e.OldValue) { string val = e.NewValue as string; ditem.OnNormalTextChanged(val); } } /// <summary> /// 项的文本 /// </summary> public string NormalText { get { return (string)GetValue(NormalTextProperty); } set { SetValue(NormalTextProperty, value); } } private void OnNormalTextChanged(string text) { if (m_Textpresenter != null) { m_Textpresenter.Text = text; } } /*-------------------------------------------------------------*/ public static readonly DependencyProperty FilterTextProperty = DependencyProperty.Register("FilterText", typeof(string), typeof(DropdownItem), new FrameworkPropertyMetadata(string.Empty, new PropertyChangedCallback(FilterTextChanged))); private static void FilterTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { DropdownItem di = d as DropdownItem; if (e.NewValue != e.OldValue) { string str = e.NewValue as string; di.FilterTextCore(str); } } public string FilterText { get { return (string)GetValue(FilterTextProperty); } set { SetValue(FilterTextProperty, value); } } #endregion #region 方法 /// <summary> /// 过滤字符颜色 /// </summary> /// <param name="filter"></param> private void FilterTextCore(string filter) { if (m_Textpresenter == null) return; if (string.IsNullOrEmpty(NormalText)) return; if (string.IsNullOrWhiteSpace(filter)) return; m_Textpresenter.Inlines.Clear(); char[] chars = NormalText.ToCharArray(); foreach (char c in chars) { Run runTxt = new Run(); runTxt.Text = c.ToString(); if (filter.Contains(c)) //关键字 { runTxt.Foreground = FilterBrush; runTxt.Tag = TAG_FILTERTEXT; } else //正常显示的字符 { runTxt.Foreground = NormalBrush; runTxt.Tag = TAG_NORMALTEXT; } m_Textpresenter.Inlines.Add(runTxt); } } public override void OnApplyTemplate() { m_Textpresenter = GetTemplateChild(PART_Textpresenter) as TextBlock; if (m_Textpresenter != null) { m_Textpresenter.Text = NormalText; } base.OnApplyTemplate(); } protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e) { RoutedEventArgs arg = new RoutedEventArgs(DropdownTextBox.ItemActivedEvent, this); this.RaiseEvent(arg); e.Handled = true; } #endregion }}