750 lines
28 KiB
C#
750 lines
28 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using CPF.Drawing;
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using CPF.Input;
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using System.Linq;
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using CPF.Animation;
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using System.Collections;
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using System.ComponentModel;
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namespace CPF.Controls
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{
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/// <summary>
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/// 表示带有下拉列表的选择控件，通过单击控件上的箭头可显示或隐藏下拉列表
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/// </summary>
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[Description("表示带有下拉列表的选择控件，通过单击控件上的箭头可显示或隐藏下拉列表")]
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public class ComboBox : ListBox
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{
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static Popup popup;
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public ComboBox()
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{
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//DropDownPanel.LayoutUpdated += DropDownPanel_LayoutUpdated;
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}
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//private void DropDownPanel_LayoutUpdated(object sender, RoutedEventArgs e)
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//{
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// if (IsDropDownOpen && popup != null)
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// {
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// var s = DropDownPanel.ActualSize;
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// BeginInvoke(() =>
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// {
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// popup.Width = s.Width + DropDownPanel.MarginLeft.GetActualValue(s.Width) + DropDownPanel.MarginRight.GetActualValue(s.Width) + 1;
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// });
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// //popup.Height = s.Height + DropDownPanel.MarginTop.GetActualValue(s.Height) + DropDownPanel.MarginBottom.GetActualValue(s.Height);
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// //System.Diagnostics.Debug.WriteLine(popup.Width);
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// }
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//}
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/// <summary>
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/// 下拉框容器 #DropDownPanel
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/// </summary>
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[NotCpfProperty]
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public Panel DropDownPanel { get; private set; } = new Panel { Name = "DropDownPanel" };
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/// <summary>
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/// 获取或设置一个值，该值指示组合框的下拉部分当前是否打开
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/// </summary>
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public bool IsDropDownOpen { get { return GetValue<bool>(); } set { SetValue(value); } }
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///// <summary>
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///// 获取选择框内容的项模板
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///// </summary>
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//public UIElementTemplate<SelectionItem> SelectionItemTemplate
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//{
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// get { return GetValue<UIElementTemplate<SelectionItem>>(); }
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// set { SetValue(value); }
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//}
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//SelectionItem selectionItem;
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protected override void InitializeComponent()
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{
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Children.Add(new TextBlock
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{
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MarginLeft = 3,
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MarginRight = 15,
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VerticalAlignment = VerticalAlignment.Center,
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MaxHeight = "100%",
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TextTrimming = TextTrimming.CharacterEllipsis,
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Bindings =
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{
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{nameof(Visibility),nameof(IsEditable),this,BindingMode.OneWay, (bool e)=>e?Visibility.Collapsed: Visibility.Visible },
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{nameof(TextBlock.Text),nameof(SelectedItems),this,BindingMode.OneWay,SelectedValueConvert}
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}
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});
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Children.Add(new TextBox
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{
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MarginLeft = 3,
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MarginRight = 15,
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AcceptsReturn = false,
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HScrollBarVisibility = ScrollBarVisibility.Hidden,
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VScrollBarVisibility = ScrollBarVisibility.Hidden,
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Bindings =
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{
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{nameof(Visibility),nameof(IsEditable),this,BindingMode.OneWay, (bool e)=>e?Visibility.Visible: Visibility.Collapsed },
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{nameof(TextBlock.Text),nameof(SelectedItems),this,BindingMode.OneWay,SelectedItemsToText }
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},
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Commands =
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{
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{nameof(TextBox.Text),TextBoxTextToSelectValue }
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}
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});
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Children.Add(new Shapes.Polyline { MarginRight = 5, IsAntiAlias = true, Points = { new Point(), new Point(4, 4), new Point(8, 0) } });
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//DropDownPanel.MarginTop = 1;
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DropDownPanel.MarginBottom = 1;
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//DropDownPanel.MarginLeft = 1;
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//DropDownPanel.MarginRight = 1;
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DropDownPanel.MinHeight = 20;
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//DropDownPanel.MaxHeight = 300;
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//DropDownPanel.Background = "#fff";
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//DropDownPanel.MaxWidth = 500;
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DropDownPanel[nameof(Width)] = (this, nameof(ActualSize), a => (FloatField)((Size)a).Width);
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var panel = ItemsPanel.CreateElement();
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panel.Name = "itemsPanel";
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panel.PresenterFor = this;
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panel.Width = "100%";
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panel.MarginTop = 0;
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//panel.Height = "100%";
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if (ShowClear)
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{
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if (IsVirtualizing)
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{
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DropDownPanel.Children.Add(new Border
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{
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Name = "dropDownBorder",
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MarginTop = 0,
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Width = "100%",
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Height = "100%",
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BorderFill = "172,172,172",
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Background = "#fff",
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Children =
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{
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new ScrollViewer { MarginTop = 0, MarginBottom = 30, Width = "100%", MaxHeight = 300, Content = new VirtualizationPresenter<ListBoxItem> { Width = "100%", MarginTop = 0, Child = panel, PresenterFor = this }, } ,
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new Panel
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{
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MarginBottom = 0,
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Width = "100%",
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Height = 30,
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Children =
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{
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new TextBlock {
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Classes = "lblgreen",
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Foreground = "#05AA69",
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Cursor = Cursors.Hand, Name = "清除",Text = "清除",
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Commands = {
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{ nameof(TextBlock.MouseUp),
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nameof(ClearSelectedVale),
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this
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}
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} }
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}
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}
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}
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});
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}
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else
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{
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DropDownPanel.Children.Add(new Border
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{
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Name = "dropDownBorder",
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MarginTop = 0,
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Width = "100%",
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Height = "100%",
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BorderFill = "172,172,172",
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Background = "#fff",
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Children = {
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new ScrollViewer { MarginTop = 0, Width = "100%", MarginBottom = 30, Content = panel, MaxHeight = 300 },
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new Panel
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{
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MarginBottom = 0,
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Width = "100%",
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Height = 30,
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Children =
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{
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new TextBlock {
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Classes = "lblgreen",
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Foreground = "#05AA69",
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Cursor = Cursors.Hand, Name = "清除",Text = "清除",
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Commands = {
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{ nameof(TextBlock.MouseUp),
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nameof(ClearSelectedVale),
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this
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}
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} }
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}
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}
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}
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});
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}
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}
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else
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{
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if (IsVirtualizing)
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{
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DropDownPanel.Children.Add(new Border { Name = "dropDownBorder", MarginTop = 0, Width = "100%", Height = "100%", BorderFill = "172,172,172", Background = "#fff", Child = new ScrollViewer { MarginTop = 0, Height = "100%", Width = "100%", MaxHeight = 300, Content = new VirtualizationPresenter<ListBoxItem> { Width = "100%", MarginTop = 0, Child = panel, PresenterFor = this }, } });
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}
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else
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{
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DropDownPanel.Children.Add(new Border { Name = "dropDownBorder", MarginTop = 0, Width = "100%", Height = "100%", BorderFill = "172,172,172", Background = "#fff", Child = new ScrollViewer { MarginTop = 0, Width = "100%", Content = panel, MaxHeight = 300 } });
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}
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}
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}
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private void ClearSelectedVale()
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{
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SelectedValue = null;
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Popup.Hide();
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IsDropDownOpen = false;
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}
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protected virtual string SelectedValueConvert(object data)
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{
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var display = DisplayMemberPath;
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StringBuilder sb = new StringBuilder();
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if (data is IEnumerable enumerable)
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{
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foreach (var item in enumerable)
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{
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sb.Append(ConvertStr(item, display));
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sb.Append(',');
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}
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if (sb.Length > 0 && sb[sb.Length - 1] == ',')
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{
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sb.Remove(sb.Length - 1, 1);
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}
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}
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else if (data != null)
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{
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sb.Append(ConvertStr(data, display));
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}
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return sb.ToString();
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}
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string ConvertStr(object a, string display)
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{
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var value = a;
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if (a is ContentControl contentControl)
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{
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value = contentControl.Content;
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}
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else if (a is UIElement element)
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{
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value = element.DataContext;
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}
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if (value == null)
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{
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return "";
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}
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if (!string.IsNullOrWhiteSpace(display))
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{
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var v = value.GetPropretyValue(display);
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if (v != null)
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{
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return v.ToString();
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}
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return "";
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}
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return value.ToString();
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}
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protected virtual string SelectedItemsToText(object data)
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{
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//if (data == null || data is IEnumerable<object> enumer && enumer.Count() == 0)
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//{
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// Binding.Current.Cancel();
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// return null;
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//}
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if (isSetSelectValue)
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{
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Binding.Current.Cancel();
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return null;
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}
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var display = DisplayMemberPath;
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StringBuilder sb = new StringBuilder();
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if (data is IEnumerable enumerable)
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{
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foreach (var item in enumerable)
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{
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sb.Append(ConvertStr(item, display));
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sb.Append(',');
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}
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if (sb.Length > 0 && sb[sb.Length - 1] == ',')
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{
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sb.Remove(sb.Length - 1, 1);
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}
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}
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else if (data != null)
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{
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sb.Append(ConvertStr(data, display));
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}
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return sb.ToString();
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}
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bool isSetSelectValue = false;
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protected virtual void TextBoxTextToSelectValue(CpfObject @object, object e)
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{
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if (!IsEditable || (Binding.Current != null && Binding.Current.Convert == SelectedItemsToText))
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{
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return;
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}
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isSetSelectValue = true;
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string txt = (@object as TextBox).Text;
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var display = DisplayMemberPath;
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//var sv = SelectedValuePath;
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//object selectValue = null;
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SelectedIndexs.Clear();
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var temp = txt.Split(',');
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foreach (var t in temp)
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{
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if (!string.IsNullOrWhiteSpace(display))
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{
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for (int i = 0; i < Items.Count; i++)
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{
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var item = Items[i];
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if (item != null)
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{
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var value = item.GetPropretyValue(display);
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if (value != null && value.ToString() == t)
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{
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//if (!string.IsNullOrWhiteSpace(sv))
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//{
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//selectValue = item.GetPropretyValue(sv);
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// break;
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//}
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//selectValue = item;
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SelectedIndexs.Add(i);
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break;
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}
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}
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}
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}
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else
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{
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for (int i = 0; i < Items.Count; i++)
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{
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var value = Items[i];
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if (value != null && value.ToString() == t)
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{
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//if (!string.IsNullOrWhiteSpace(sv))
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//{
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// selectValue = value.GetPropretyValue(sv);
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// break;
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//}
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//selectValue = value;
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SelectedIndexs.Add(i);
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break;
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}
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}
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}
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}
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//SelectedValue = selectValue;
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//由于SelectedItems是异步更新的，只能异步延迟设置
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BeginInvoke(() =>
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{
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isSetSelectValue = false;
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});
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}
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//protected override Panel GetItemsPanel()
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//{
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// var panel = (Panel)Find().FirstOrDefault(a => a.Name == "itemsPanel");
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// if (panel == null)
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// {
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// var sv = DropDownPanel.Find<ScrollViewer>().FirstOrDefault(a => (a.Content is Panel) && ((Panel)a.Content).Name == "itemsPanel");
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// if (sv != null)
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// {
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// panel = sv.Content as Panel;
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// }
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// }
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// return panel;
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//}
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//Panel panel;
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protected override void OnInitialized()
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{
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base.OnInitialized();
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//panel = GetItemsPanel();
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//if (panel == null)
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//{
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// throw new Exception("未定义ItemsHostPanel");
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//}
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ItemsHost.LayoutUpdated += Panel_LayoutUpdated;
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ItemsHost.MouseDown += ItemsHost_MouseDown;
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ItemsHost.MouseUp += ItemsHost_MouseUp;
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ItemsHost.PreviewMouseDown += ItemsHost_PreviewMouseDown;
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}
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bool isMouseDownHost;
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private void ItemsHost_PreviewMouseDown(object sender, MouseButtonEventArgs e)
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{
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isMouseDownHost = true;
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}
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Point? touch;
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private void ItemsHost_MouseUp(object sender, MouseButtonEventArgs e)
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{
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if (e.IsTouch && SelectionMode == SelectionMode.Single)
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{
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if (touch == e.Location)
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{
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IsDropDownOpen = false;
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}
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touch = null;
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}
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}
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private void ItemsHost_MouseDown(object sender, MouseButtonEventArgs e)
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{
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if (e.IsTouch)
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{
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touch = e.Location;
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}
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}
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private void Panel_LayoutUpdated(object sender, RoutedEventArgs e)
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{
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ItemsPanelHeight = ItemsHost.ActualSize.Height;
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}
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//protected override void OnLayoutUpdated()
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//{
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// base.OnLayoutUpdated();
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// ComboBoxWidth = ActualSize.Width;
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//}
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/// <summary>
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/// 下拉列表高度
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/// </summary>
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protected float ItemsPanelHeight
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{
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get { return GetValue<float>(); }
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private set { SetValue(value); }
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}
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///// <summary>
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///// 下拉框宽度
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///// </summary>
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//protected float ComboBoxWidth
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//{
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// get { return GetValue<float>(); }
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// set { SetValue(value); }
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//}
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private static Popup Popup
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{
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get
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{
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if (popup == null)
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{
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popup = new Popup { Name = "DropDownPopup" };
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popup.Background = null;
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popup.CanActivate = false;
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popup.LayoutUpdated += Popup_LayoutUpdated;
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}
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return popup;
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}
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}
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private static void Popup_LayoutUpdated(object sender, RoutedEventArgs e)
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{
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popup.Height = "auto";
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}
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protected override void OnAttachedToVisualTree()
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{
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base.OnAttachedToVisualTree();
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Root.LostFocus += Popup_LostFocus;
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Root.PreviewMouseDown += Root_PreviewMouseDown;
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}
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bool mouseDownMe = false;
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private void Root_PreviewMouseDown(object sender, MouseButtonEventArgs e)
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{
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BeginInvoke(() =>
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{
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if (!mouseDownMe)
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{
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IsDropDownOpen = false;
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}
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mouseDownMe = false;
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});
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}
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protected override void OnItemElementAdded(UIElement element)
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{
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base.OnItemElementAdded(element);
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element.MouseUp += Element_MouseUp;
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}
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private void Element_MouseUp(object sender, MouseButtonEventArgs e)
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{
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if (SelectionMode == SelectionMode.Single)
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{
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if (!e.IsTouch && isMouseDownHost)
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{
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IsDropDownOpen = false;
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}
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}
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}
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protected override void OnItemElementRemoved(UIElement element)
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{
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base.OnItemElementRemoved(element);
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element.MouseUp -= Element_MouseUp;
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}
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protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
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{
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mouseDownMe = true;
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base.OnPreviewMouseDown(e);
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}
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private void Popup_LostFocus(object sender, RoutedEventArgs e)
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{
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BeginInvoke(() =>
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{
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//if (IsDisposed)
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//{
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// return;
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//}
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IsDropDownOpen = false;
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});
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}
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protected override void OnDetachedFromVisualTree()
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{
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IsDropDownOpen = false;
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base.OnDetachedFromVisualTree();
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Root.LostFocus -= Popup_LostFocus;
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Root.PreviewMouseDown -= Root_PreviewMouseDown;
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}
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[PropertyChanged(nameof(Visibility))]
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void OnHide(object newValue, object oldValue, PropertyMetadataAttribute attribute)
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{
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if ((Visibility)newValue != Visibility.Visible)
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{
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IsDropDownOpen = false;
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}
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}
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protected override void OnMouseDown(MouseButtonEventArgs e)
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{
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base.OnMouseDown(e);
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if (!e.Handled)
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{
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if (!IsKeyboardFocusWithin)
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{
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Focus(NavigationMethod.Click);
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}
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//if (!(e.OriginalSource as UIElement).IsAncestors(DropDownPanel) || SelectionMode == SelectionMode.Single)
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//{
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//if (!IsDropDownOpen)
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//{
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IsDropDownOpen = !IsDropDownOpen;
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//}
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//}
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}
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}
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/// <summary>
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/// 编辑模式，就是可以文本框输入，自动选中下拉列表内容
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/// </summary>
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public bool IsEditable
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{
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get { return GetValue<bool>(); }
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set { SetValue(value); }
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}
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/// <summary>
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/// 是否展示清除按钮
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/// </summary>
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[PropertyMetadata(false)]
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public bool ShowClear
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{
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get { return GetValue<bool>(); }
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set { SetValue(value); }
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}
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//protected override void OnSelectionChanged(EventArgs e)
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//{
|
||
// base.OnSelectionChanged(e);
|
||
// //if (SelectedIndexs.Count > 0 && SelectionItemTemplate != null)
|
||
// //{
|
||
// // if (selectionItem == null)
|
||
// // {
|
||
// // selectionItem = SelectionItemTemplate.CreateElement();
|
||
// // Children.Add(selectionItem);
|
||
// // }
|
||
// // selectionItem.DataContext = SelectedItems;
|
||
// // var dis = DisplayMemberPath;
|
||
// // if (!string.IsNullOrWhiteSpace(dis))
|
||
// // {
|
||
// // selectionItem.Content = SelectedItems.Select(a => a.GetPropretyValue(dis));
|
||
// // }
|
||
// // else
|
||
// // {
|
||
// // selectionItem.Content = SelectedItems;
|
||
// // }
|
||
// //}
|
||
// //else
|
||
// //{
|
||
// // if (selectionItem != null)
|
||
// // {
|
||
// // Children.Remove(selectionItem);
|
||
// // selectionItem.Dispose();
|
||
// // selectionItem = null;
|
||
// // }
|
||
// //}
|
||
//}
|
||
|
||
//[PropertyChanged(nameof(SelectionItemTemplate))]
|
||
//void RegisterSelectionItemTemplate(object newValue, object oldValue, PropertyMetadataAttribute attribute)
|
||
//{
|
||
// if (selectionItem != null)
|
||
// {
|
||
// Children.Remove(selectionItem);
|
||
// selectionItem.Dispose();
|
||
// selectionItem = null;
|
||
// }
|
||
// var n = newValue as UIElementTemplate<SelectionItem>;
|
||
// if (n != null && SelectedIndexs.Count > 0)
|
||
// {
|
||
// selectionItem = n.CreateElement();
|
||
// Children.Add(selectionItem);
|
||
// selectionItem.DataContext = SelectedItems;
|
||
// selectionItem.Content = SelectedItems;
|
||
// }
|
||
//}
|
||
|
||
[PropertyChanged(nameof(IsDropDownOpen))]
|
||
void RegisterIsDropDownOpen(object newValue, object oldValue, PropertyMetadataAttribute attribute)
|
||
{
|
||
var n = (bool)newValue;
|
||
if (n)
|
||
{
|
||
//var p = PointToScreen(new Point(0, ActualSize.Height));
|
||
//Popup.MarginTop = p.Y / Root.Scaling;
|
||
//Popup.MarginLeft = p.X / Root.Scaling;
|
||
//Popup.styleSheet = Root.StyleSheet;
|
||
if (Popup.PlacementTarget is ComboBox comboBox && popup.PlacementTarget != this)
|
||
{
|
||
comboBox.IsDropDownOpen = false;
|
||
}
|
||
popup.Placement = PlacementMode.Padding;
|
||
popup.MarginLeft = 0;
|
||
popup.MarginTop = "100%";
|
||
Popup.Children.Add(DropDownPanel);
|
||
popup.PlacementTarget = this;
|
||
Popup.LoadStyle(Root);
|
||
popup.StaysOpen = true;
|
||
//popup.LayoutManager.ExecuteLayoutPass();
|
||
//popup.InvalidateMeasure();
|
||
popup.Width = "auto";
|
||
Popup.Visibility = Visibility.Visible;
|
||
//popup.InvalidateMeasure();
|
||
//popup.LayoutManager.ExecuteLayoutPass();
|
||
}
|
||
else
|
||
{
|
||
isMouseDownHost = false;
|
||
if (Popup.PlacementTarget == this)
|
||
{
|
||
Popup.Visibility = Visibility.Collapsed;
|
||
popup.PlacementTarget = null;
|
||
}
|
||
if (CPF.Platform.Application.DisablePopupClose)
|
||
{
|
||
return;
|
||
}
|
||
Popup.Children.Remove(DropDownPanel);
|
||
}
|
||
}
|
||
|
||
//protected override void OnPropertyChanged(string propertyName, object oldValue, object newValue, PropertyMetadataAttribute propertyMetadata)
|
||
//{
|
||
// base.OnPropertyChanged(propertyName, oldValue, newValue, propertyMetadata);
|
||
// if (propertyName == nameof(SelectionItemTemplate))
|
||
// {
|
||
// if (selectionItem != null)
|
||
// {
|
||
// Children.Remove(selectionItem);
|
||
// selectionItem.Dispose();
|
||
// selectionItem = null;
|
||
// }
|
||
// var n = newValue as UIElementTemplate<SelectionItem>;
|
||
// if (n != null && SelectedIndexs.Count > 0)
|
||
// {
|
||
// selectionItem = n.CreateElement();
|
||
// Children.Add(selectionItem);
|
||
// selectionItem.DataContext = SelectedItems;
|
||
// selectionItem.Content = SelectedItems;
|
||
// }
|
||
// }
|
||
// else if (propertyName == nameof(IsDropDownOpen))
|
||
// {
|
||
// var n = (bool)newValue;
|
||
// if (n)
|
||
// {
|
||
// //var p = PointToScreen(new Point(0, ActualSize.Height));
|
||
// //Popup.MarginTop = p.Y / Root.Scaling;
|
||
// //Popup.MarginLeft = p.X / Root.Scaling;
|
||
// Popup.styleSheet = Root.StyleSheet;
|
||
// popup.Placement = PlacementMode.Padding;
|
||
// popup.MarginLeft = 0;
|
||
// popup.MarginTop = "100%";
|
||
// popup.Height = "auto";
|
||
// Popup.Children.Add(DropDownPanel);
|
||
// popup.PlacementTarget = this;
|
||
// popup.StaysOpen = true;
|
||
// Popup.Visibility = Visibility.Visible;
|
||
// }
|
||
// else
|
||
// {
|
||
// Popup.Visibility = Visibility.Collapsed;
|
||
// popup.PlacementTarget = null;
|
||
// Popup.Children.Remove(DropDownPanel);
|
||
// }
|
||
// }
|
||
//}
|
||
|
||
protected override void OnKeyDown(KeyEventArgs e)
|
||
{
|
||
base.OnKeyDown(e);
|
||
if (!e.Handled)
|
||
{
|
||
if (e.Key == Keys.Enter)
|
||
{
|
||
IsDropDownOpen = !IsDropDownOpen;
|
||
}
|
||
else if (e.Key == Keys.Down)
|
||
{
|
||
IsDropDownOpen = true;
|
||
}
|
||
}
|
||
}
|
||
|
||
//protected override void OnLostFocus(RoutedEventArgs e)
|
||
//{
|
||
// base.OnLostFocus(e);
|
||
// if (!e.Handled)
|
||
// {
|
||
// IsDropDownOpen = false;
|
||
// }
|
||
//}
|
||
|
||
protected override void OnOverrideMetadata(OverrideMetadata overridePropertys)
|
||
{
|
||
base.OnOverrideMetadata(overridePropertys);
|
||
overridePropertys.Override(nameof(Background), new UIPropertyMetadataAttribute((ViewFill)"234,234,234", UIPropertyOptions.AffectsRender));
|
||
overridePropertys.Override(nameof(BorderFill), new UIPropertyMetadataAttribute((ViewFill)"172,172,172", UIPropertyOptions.AffectsRender));
|
||
overridePropertys.Override(nameof(Focusable), new PropertyMetadataAttribute(true));
|
||
//overridePropertys.Override(nameof(ZIndex), new UIPropertyMetadataAttribute(1, UIPropertyOptions.AffectsArrange));
|
||
overridePropertys.Override(nameof(Width), new UIPropertyMetadataAttribute((FloatField)100, UIPropertyOptions.AffectsMeasure));
|
||
overridePropertys.Override(nameof(Height), new UIPropertyMetadataAttribute((FloatField)20, UIPropertyOptions.AffectsMeasure));
|
||
overridePropertys.Override(nameof(ItemTemplate), new PropertyMetadataAttribute((UIElementTemplate<ListBoxItem>)new ListBoxItem { Width = "100%" }));
|
||
overridePropertys.Override(nameof(SelectionMethod), new PropertyMetadataAttribute(SelectionMethod.MouseUp));
|
||
//overridePropertys.Override(nameof(SelectionItemTemplate), new PropertyMetadataAttribute((UIElementTemplate<SelectionItem>)new SelectionItem()));
|
||
}
|
||
}
|
||
}
|