using System.Text.RegularExpressions;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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namespace UILib
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{
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public class NumberInput : TextBox
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{
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public NumberInput()
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{
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DataObject.AddPastingHandler(this, OnPasting);
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// 禁用输入法
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InputMethod.SetIsInputMethodEnabled(this, false);
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// 设置输入法模式为字母
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InputScope inputScope = new InputScope();
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InputScopeName inputScopeName = new InputScopeName();
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inputScopeName.NameValue = InputScopeNameValue.Number;
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inputScope.Names.Add(inputScopeName);
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this.InputScope = inputScope;
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}
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static NumberInput()
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{
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DefaultStyleKeyProperty.OverrideMetadata(typeof(NumberInput),
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new FrameworkPropertyMetadata(typeof(NumberInput)));
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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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}
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protected override void OnPreviewTextInput(TextCompositionEventArgs e)
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{
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// 允许输入数字、负号和小数点
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Regex regex = new Regex(@"^-?\d*\.?\d*$");
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string segment = e.Text == "." ? ".0" : e.Text;
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string newText = this.Text.Insert(this.CaretIndex, segment);
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// 检查是否已经有负号，如果有则不允许再输入负号
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if (e.Text == "-" && this.Text.Contains("-"))
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{
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e.Handled = true;
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return;
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}
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// 检查是否已经有小数点，如果有则不允许再输入小数点
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if (e.Text == "." && this.Text.Contains("."))
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{
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e.Handled = true;
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return;
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}
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//else if (e.Text == ".") {
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// e.Text = ".0";
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//}
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//regex = new Regex(@"^-?\d*\.?\d*$|^-?\.\d*$|^-?\d+\.$");
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// 验证完整的新文本是否符合数字格式
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if (!regex.IsMatch(newText))
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{
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e.Handled = true;
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return;
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}
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base.OnPreviewTextInput(e);
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}
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protected override void OnPreviewKeyDown(KeyEventArgs e)
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{
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// 允许使用退格键和删除键
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if (e.Key == Key.Back || e.Key == Key.Delete)
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{
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base.OnPreviewKeyDown(e);
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return;
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}
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// 允许复制粘贴等快捷键
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if (Keyboard.Modifiers == ModifierKeys.Control &&
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(e.Key == Key.C || e.Key == Key.V || e.Key == Key.X))
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{
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base.OnPreviewKeyDown(e);
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return;
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}
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}
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private void OnPasting(object sender, DataObjectPastingEventArgs e)
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{
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if (e.DataObject.GetDataPresent(typeof(string)))
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{
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string text = (string)e.DataObject.GetData(typeof(string));
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Regex regex = new Regex(@"^-?\d*\.?\d*$");
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if (!regex.IsMatch(text))
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{
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e.CancelCommand();
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}
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}
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}
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}
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}
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