我做的这个文本框，可设置最大值，最小值，有失去焦点事件的话，失去焦点文本框里的数字是你上次填的数字，避免数据为空的情况。
有失去焦点事件
using System.Windows.Input;
using System.Windows;
using System.Windows.Controls;
namespace 项目名
{
public class IntegerTextBox : TextBox
{
public bool isMouseEntered = false;
public string PreviousText
{
get { return (string)GetValue(PreviousTextProperty); }
set { SetValue(PreviousTextProperty, value); }
}
public static readonly DependencyProperty PreviousTextProperty =
DependencyProperty.Register("PreviousText", typeof(string), typeof(IntegerTextBox), new PropertyMetadata(string.Empty));
public string HistoryText
{
get { return (string)GetValue(HistoryTextProperty); }
set { SetValue(HistoryTextProperty, value); }
}
public static readonly DependencyProperty HistoryTextProperty = DependencyProperty.Register("HistoryText", typeof(string), typeof(IntegerTextBox), new PropertyMetadata(string.Empty));
public int? MinValue
{
get { return (int?)GetValue(MinValueProperty); }
set { SetValue(MinValueProperty, value); }
}
public static readonly DependencyProperty MinValueProperty =
DependencyProperty.Register("MinValue", typeof(int?), typeof(IntegerTextBox));
public int MaxValue
{
get { return (int)GetValue(MaxValueProperty); }
set { SetValue(MaxValueProperty, value); }
}
public static readonly DependencyProperty MaxValueProperty =
DependencyProperty.Register("MaxValue", typeof(int), typeof(IntegerTextBox), new PropertyMetadata(int.MaxValue));
public static bool GetIsEnabled(DependencyObject obj)
{
return (bool)obj.GetValue(IsGotFocusProperty);
}
public static void SetIsEnabled(DependencyObject obj, bool value)
{
obj.SetValue(IsGotFocusProperty, value);
}
public bool IsNeedLoseFucos
{
get { return (bool)GetValue(IsNeedLoseFucosvProperty); }
set { SetValue(IsNeedLoseFucosvProperty, value); }
}
public static readonly DependencyProperty IsNeedLoseFucosvProperty =
DependencyProperty.RegisterAttached("IsNeedLoseFucos", typeof(bool), typeof(IntegerTextBox), new PropertyMetadata(true));
public bool IsGotFocus
{
get { return (bool)GetValue(IsGotFocusProperty); }
set { SetValue(IsGotFocusProperty, value); }
}
public static readonly DependencyProperty IsGotFocusProperty =
DependencyProperty.RegisterAttached("IsGotFocus", typeof(bool), typeof(IntegerTextBox), new PropertyMetadata(false));
static IntegerTextBox()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(IntegerTextBox), new FrameworkPropertyMetadata(typeof(IntegerTextBox)));
}
public IntegerTextBox()
{
LostFocus += IntegerTextBox_LostFocus;
PreviewTextInput += IntegerTextBox_PreviewTextInput;
}
private void IntegerTextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
Text = Text.Trim();
string txt = Text + e.Text;
if (txt.Length > 1 && txt.StartsWith('0'))
{
Text = Text.Substring(1);
}
if (!int.TryParse(txt, out int value))
{
if (!string.IsNullOrWhiteSpace(Text))
{
var index = Text.IndexOf(e.Text);
if (index > -1) { Text = Text.Remove(index); }
SelectionStart = Text.Length + e.Text.Length;
}
e.Handled = true; // 阻止输入非数字字符
}
//else if (value < MinValue && value.ToString().Length == MinValue.ToString().Length)
//{
// Text = MinValue.ToString(); // 将文本框的值设置为最小值
// SelectionStart = Text.Length + e.Text.Length;
// e.Handled = true; // 阻止输入超出取值范围的数字
//}
else if (value > MaxValue)
{
Text = MaxValue.ToString(); // 将文本框的值设置为最大值
SelectionStart = Text.Length + e.Text.Length;
e.Handled = true; // 阻止输入超出取值范围的数字
}
else
{
Text = value.ToString();
SelectionStart = Text.Length + e.Text.Length;
e.Handled = true;
}
SelectionStart = Text.Length + e.Text.Length;
HistoryText = Text;
}
private void IntegerTextBox_LostFocus(object sender, RoutedEventArgs e)
{
IsGotFocus = false;
Text = Text.Trim();
if (string.IsNullOrEmpty(Text))
{
if (!string.IsNullOrEmpty(HistoryText) && int.TryParse(HistoryText, out int history) && history > MinValue)
{
Text = HistoryText;
}
else if (!string.IsNullOrEmpty(PreviousText))
{
Text = PreviousText;
}
else if (MinValue is not null)
{
Text = MinValue.Value.ToString();
}
}
else
{
if (int.TryParse(Text, out int num))
{
if (num < MinValue)
{
if (!string.IsNullOrEmpty(HistoryText) && int.TryParse(HistoryText, out int history) && history > MinValue)
{
Text = HistoryText;
}
else
{
Text = MinValue.ToString();
}
}
else if (num > MaxValue)
{
if (!string.IsNullOrEmpty(HistoryText) && int.TryParse(HistoryText, out int history) && history < MaxValue)
{
Text = HistoryText;
}
else if (!string.IsNullOrEmpty(PreviousText))
{
Text = PreviousText;
}
else
{
Text = MaxValue.ToString();
}
}
}
}
SelectionStart = Text.Length;
}
}
}
没有失去焦点事件：
public class IntegerTextBoxNoLF : TextBox
{
public bool isMouseEntered = false;
public string PreviousText
{
get { return (string)GetValue(PreviousTextProperty); }
set { SetValue(PreviousTextProperty, value); }
}
public static readonly DependencyProperty PreviousTextProperty =
DependencyProperty.Register("PreviousText", typeof(string), typeof(IntegerTextBoxNoLF), new PropertyMetadata(string.Empty));
public string HistoryText
{
get { return (string)GetValue(HistoryTextProperty); }
set { SetValue(HistoryTextProperty, value); }
}
public static readonly DependencyProperty HistoryTextProperty = DependencyProperty.Register("HistoryText", typeof(string), typeof(IntegerTextBoxNoLF), new PropertyMetadata(string.Empty));
public int? MinValue
{
get { return (int?)GetValue(MinValueProperty); }
set { SetValue(MinValueProperty, value); }
}
public static readonly DependencyProperty MinValueProperty =
DependencyProperty.Register("MinValue", typeof(int?), typeof(IntegerTextBoxNoLF));
public int MaxValue
{
get { return (int)GetValue(MaxValueProperty); }
set { SetValue(MaxValueProperty, value); }
}
public static readonly DependencyProperty MaxValueProperty =
DependencyProperty.Register("MaxValue", typeof(int), typeof(IntegerTextBoxNoLF), new PropertyMetadata(int.MaxValue));
public static bool GetIsEnabled(DependencyObject obj)
{
return (bool)obj.GetValue(IsGotFocusProperty);
}
public static void SetIsEnabled(DependencyObject obj, bool value)
{
obj.SetValue(IsGotFocusProperty, value);
}
public bool IsNeedLoseFucos
{
get { return (bool)GetValue(IsNeedLoseFucosvProperty); }
set { SetValue(IsNeedLoseFucosvProperty, value); }
}
public static readonly DependencyProperty IsNeedLoseFucosvProperty =
DependencyProperty.RegisterAttached("IsNeedLoseFucos", typeof(bool), typeof(IntegerTextBoxNoLF), new PropertyMetadata(true));
public bool IsGotFocus
{
get { return (bool)GetValue(IsGotFocusProperty); }
set { SetValue(IsGotFocusProperty, value); }
}
public static readonly DependencyProperty IsGotFocusProperty =
DependencyProperty.RegisterAttached("IsGotFocus", typeof(bool), typeof(IntegerTextBoxNoLF), new PropertyMetadata(false));
static IntegerTextBoxNoLF()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(IntegerTextBoxNoLF), new FrameworkPropertyMetadata(typeof(IntegerTextBoxNoLF)));
}
public IntegerTextBoxNoLF()
{
PreviewTextInput += IntegerTextBox_PreviewTextInput;
//PreviewMouseLeftButtonDown += IntegerTextBox_PreviewMouseLeftButtonDown;
}
private void IntegerTextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
Text = Text.Trim();
string txt = Text + e.Text;
if (txt.Length > 1 && txt.StartsWith('0'))
{
Text = Text.Substring(1);
}
if (!int.TryParse(txt, out int value))
{
if (!string.IsNullOrWhiteSpace(Text))
{
var index = Text.IndexOf(e.Text);
if (index > -1) { Text = Text.Remove(index); }
SelectionStart = Text.Length + e.Text.Length;
}
e.Handled = true; // 阻止输入非数字字符
}
else if (value < MinValue && value.ToString().Length == MinValue.ToString().Length)
{
Text = MinValue.ToString(); // 将文本框的值设置为最小值
SelectionStart = Text.Length + e.Text.Length;
e.Handled = true; // 阻止输入超出取值范围的数字
}
else if (value > MaxValue)
{
Text = MaxValue.ToString(); // 将文本框的值设置为最大值
SelectionStart = Text.Length + e.Text.Length;
e.Handled = true; // 阻止输入超出取值范围的数字
}
else
{
Text = value.ToString();
SelectionStart = Text.Length + e.Text.Length;
e.Handled = true;
}
SelectionStart = Text.Length + e.Text.Length;
HistoryText = Text;
}
private void IntegerTextBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
Text = string.Empty;
Focusable = true;
Focus();
IsGotFocus = true;
}
}调用：
<local:IntegerTextBox MinValue="0" MaxValue="59" TextAlignment="Center" Width="120" Height="48" Text="{Binding Program.VibrationHour,TargetNullValue={x:Static sys:String.Empty}}" VerticalContentAlignment="Center" InputMethod.IsInputMethodEnabled="False" />