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WpfAppTest/ElementHelper.cs
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237
WpfAppTest/ElementHelper.cs
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using System;
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using System.ComponentModel;
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using System.Reflection;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Controls.Primitives;
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using System.Windows.Data;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Shell;
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namespace ModernWpf.Controls
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{
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// ==========================================
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// 1. 附加属性帮助类 (新增 Prefix)
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// ==========================================
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public class ElementHelper : DependencyObject
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{
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// ... 原有的属性保持不变 (Watermark, Icon, CornerRadius, Header) ...
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public static readonly DependencyProperty WatermarkProperty = DependencyProperty.RegisterAttached("Watermark", typeof(string), typeof(ElementHelper), new PropertyMetadata(""));
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public static void SetWatermark(DependencyObject element, string value) => element.SetValue(WatermarkProperty, value);
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public static string GetWatermark(DependencyObject element) => (string)element.GetValue(WatermarkProperty);
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public static readonly DependencyProperty IconProperty = DependencyProperty.RegisterAttached("Icon", typeof(Geometry), typeof(ElementHelper), new PropertyMetadata(null));
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public static void SetIcon(DependencyObject element, Geometry value) => element.SetValue(IconProperty, value);
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public static Geometry GetIcon(DependencyObject element) => (Geometry)element.GetValue(IconProperty);
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public static readonly DependencyProperty CornerRadiusProperty = DependencyProperty.RegisterAttached("CornerRadius", typeof(CornerRadius), typeof(ElementHelper), new PropertyMetadata(new CornerRadius(4)));
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public static void SetCornerRadius(DependencyObject element, CornerRadius value) => element.SetValue(CornerRadiusProperty, value);
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public static CornerRadius GetCornerRadius(DependencyObject element) => (CornerRadius)element.GetValue(CornerRadiusProperty);
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public static readonly DependencyProperty HeaderProperty = DependencyProperty.RegisterAttached("Header", typeof(string), typeof(ElementHelper), new PropertyMetadata(""));
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public static void SetHeader(DependencyObject element, string value) => element.SetValue(HeaderProperty, value);
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public static string GetHeader(DependencyObject element) => (string)element.GetValue(HeaderProperty);
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// === 新增 Prefix 属性 (支持文字或UI元素) ===
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public static readonly DependencyProperty PrefixProperty = DependencyProperty.RegisterAttached("Prefix", typeof(object), typeof(ElementHelper), new PropertyMetadata(null));
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public static void SetPrefix(DependencyObject element, object value) => element.SetValue(PrefixProperty, value);
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public static object GetPrefix(DependencyObject element) => element.GetValue(PrefixProperty);
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}
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// ==========================================
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// 2. ModernWindow (保持不变)
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// ==========================================
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public class ModernWindow : Window
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{
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static ModernWindow()
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{
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DefaultStyleKeyProperty.OverrideMetadata(typeof(ModernWindow), new FrameworkPropertyMetadata(typeof(ModernWindow)));
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}
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public ModernWindow()
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{
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var chrome = new WindowChrome
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{
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CaptionHeight = 32,
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ResizeBorderThickness = new Thickness(4),
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// 让系统边框可见，从而触发 Win11 原生圆角和阴影
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GlassFrameThickness = new Thickness(1),
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UseAeroCaptionButtons = false
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};
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WindowChrome.SetWindowChrome(this, chrome);
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CommandBindings.Add(new CommandBinding(SystemCommands.CloseWindowCommand, (s, e) => SystemCommands.CloseWindow(this)));
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CommandBindings.Add(new CommandBinding(SystemCommands.MaximizeWindowCommand, (s, e) => SystemCommands.MaximizeWindow(this)));
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CommandBindings.Add(new CommandBinding(SystemCommands.MinimizeWindowCommand, (s, e) => SystemCommands.MinimizeWindow(this)));
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CommandBindings.Add(new CommandBinding(SystemCommands.RestoreWindowCommand, (s, e) => SystemCommands.RestoreWindow(this)));
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}
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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if (GetTemplateChild("PART_TitleBar") is Border titleBar)
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{
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titleBar.MouseLeftButtonDown += (s, e) =>
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{
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if (e.ClickCount == 2)
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{
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if (ResizeMode != ResizeMode.NoResize)
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WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;
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}
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else
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{
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DragMove();
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}
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};
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}
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}
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}
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public class SearchableComboBox : ComboBox
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{
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private TextBox _editableTextBox;
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private bool _isInternalOperation;
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static SearchableComboBox()
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{
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DefaultStyleKeyProperty.OverrideMetadata(typeof(SearchableComboBox), new FrameworkPropertyMetadata(typeof(SearchableComboBox)));
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}
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public SearchableComboBox()
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{
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IsEditable = true;
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IsTextSearchEnabled = false;
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StaysOpenOnEdit = true;
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}
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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_editableTextBox = GetTemplateChild("PART_EditableTextBox") as TextBox;
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if (_editableTextBox != null)
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{
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_editableTextBox.TextChanged += OnEditableTextBoxTextChanged;
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// 点击时全选
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_editableTextBox.GotFocus += (s, e) => _editableTextBox.SelectAll();
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}
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}
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protected override void OnSelectionChanged(SelectionChangedEventArgs e)
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{
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if (_isInternalOperation) return;
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_isInternalOperation = true;
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base.OnSelectionChanged(e);
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// 重点 1：选中项改变后，必须彻底清空过滤器，否则下次打开下拉框只剩下一项
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this.Items.Filter = null;
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_isInternalOperation = false;
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}
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private void OnEditableTextBoxTextChanged(object sender, TextChangedEventArgs e)
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{
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if (_isInternalOperation) return;
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string searchText = _editableTextBox.Text;
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string selectedText = GetItemDisplayText(SelectedItem);
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// 重点 2：断开锁定逻辑
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// 如果文本框的内容和当前选中项的文本不一致，说明用户正在打字替换内容
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if (SelectedItem != null && searchText != selectedText)
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{
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_isInternalOperation = true;
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SelectedItem = null; // 必须将 SelectedItem 设为 null，否则 WPF 会强行还原文本
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_isInternalOperation = false;
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}
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// 重点 3：执行过滤
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this.Items.Filter = item =>
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{
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if (string.IsNullOrEmpty(searchText)) return true;
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string itemText = GetItemDisplayText(item);
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// 只要包含关键字就显示（忽略大小写）
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return itemText.IndexOf(searchText, StringComparison.OrdinalIgnoreCase) >= 0;
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};
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// 自动打开下拉框
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if (!IsDropDownOpen && _editableTextBox.IsFocused && !string.IsNullOrEmpty(searchText))
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{
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IsDropDownOpen = true;
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}
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}
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private string GetItemDisplayText(object item)
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{
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if (item == null) return string.Empty;
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if (item is ComboBoxItem cbi) return cbi.Content?.ToString() ?? string.Empty;
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// 兼容 DisplayMemberPath 或 TextSearch.TextPath
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string path = DisplayMemberPath;
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if (string.IsNullOrEmpty(path)) path = TextSearch.GetTextPath(this);
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if (!string.IsNullOrEmpty(path))
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{
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var prop = item.GetType().GetProperty(path);
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if (prop != null) return prop.GetValue(item)?.ToString() ?? string.Empty;
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}
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return item.ToString();
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}
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}
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public class ModernPasswordBox : Control
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{
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static ModernPasswordBox()
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{
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DefaultStyleKeyProperty.OverrideMetadata(typeof(ModernPasswordBox), new FrameworkPropertyMetadata(typeof(ModernPasswordBox)));
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}
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public string Password
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{
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get => (string)GetValue(PasswordProperty);
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set => SetValue(PasswordProperty, value);
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}
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public static readonly DependencyProperty PasswordProperty = DependencyProperty.Register("Password", typeof(string), typeof(ModernPasswordBox), new PropertyMetadata(string.Empty));
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// 辅助属性：标记是否为空，用于 XAML 控制水印显隐
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public bool IsEmpty
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{
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get => (bool)GetValue(IsEmptyProperty);
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private set => SetValue(IsEmptyProperty, value);
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}
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public static readonly DependencyProperty IsEmptyProperty = DependencyProperty.Register("IsEmpty", typeof(bool), typeof(ModernPasswordBox), new PropertyMetadata(true));
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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var pb = GetTemplateChild("PART_PasswordBox") as PasswordBox;
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var tb = GetTemplateChild("PART_TextBox") as TextBox;
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var btn = GetTemplateChild("PART_ToggleBtn") as ToggleButton;
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if (pb != null && tb != null && btn != null)
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{
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pb.PasswordChanged += (s, e) =>
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{
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if (pb.Visibility == Visibility.Visible)
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{
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Password = pb.Password;
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IsEmpty = string.IsNullOrEmpty(pb.Password);
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}
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};
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tb.TextChanged += (s, e) =>
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{
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if (tb.Visibility == Visibility.Visible)
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{
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Password = tb.Text;
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IsEmpty = string.IsNullOrEmpty(tb.Text);
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}
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};
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btn.Checked += (s, e) => { tb.Text = pb.Password; tb.Visibility = Visibility.Visible; pb.Visibility = Visibility.Collapsed; };
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btn.Unchecked += (s, e) => { pb.Password = tb.Text; pb.Visibility = Visibility.Visible; tb.Visibility = Visibility.Collapsed; };
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}
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}
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}
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}
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