36 lines
841 B
C#
36 lines
841 B
C#
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using System.Windows;
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using System.Windows.Controls;
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namespace WPF_5_CustomTextboxContro.View.UserControllers;
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public partial class ClearableTextBox : UserControl
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{
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private string _placeholder;
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public ClearableTextBox()
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{
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InitializeComponent();
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}
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public string Placeholder
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{
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get => _placeholder;
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set
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{
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_placeholder = value;
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// 不要这样写！！！
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TbPlaceholder.Text = value;
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}
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}
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private void ClearButton_OnClick(object sender, RoutedEventArgs e)
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{
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MyTextBox.Clear();
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MyTextBox.Focus();
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}
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private void MyTextBox_OnTextChanged(object sender, TextChangedEventArgs e)
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{
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TbPlaceholder.Visibility = string.IsNullOrEmpty(MyTextBox.Text) ? Visibility.Visible : Visibility.Hidden;
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}
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}
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