WPF自定义控件Textbox 带水印 以及错误信息显示_02
2020-12-13 14:36
标签：style blog http io color os ar 使用 for 前面写过一篇关于TextBox自定义控件 带水印以及错误信息显示的随笔 但是有一些BUG和一些功能不全面 这次基本补全 算是对上一篇的完善和升级。 前面只是实现了基本的水印信息以及错误信息显示.缺少了部分其他的功能 这次增加了以下功能： 1.限定textbox文本框输入长度 2.修复错误信息显示BUG. 3.更改显示样式 4.修改默认值赋值问题 先给大家来张图片看看 先贴出后台代码 前台代码 调用界面代码 这次基本没有问题了 我现在的项目中正在使用.暂时没发现什么问题. 如果你很懒 想要直接代码可去下面下载 http://download.csdn.net/detail/fm158512775/8103159; WPF自定义控件Textbox 带水印 以及错误信息显示_02 标签：style blog http io color os ar 使用 for 原文地址：http://www.cnblogs.com/fanmiao/p/4064250.html
public partial class SelfWateMarkTextbox : System.Windows.Controls.UserControl
{
private const string defaultText = "";
private const string IsInputText = "";
private const string IsErrorText = "";
private const string IsMaxLength = "30";
public string TextValue = string.Empty;
public SelfWateMarkTextbox()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(WateMarkTextbox_Loaded);
this.GotFocus += new RoutedEventHandler(WateMarkTextbox_GotFocus);
this.LostFocus += new RoutedEventHandler(WateMarkTextbox_LostFocus);
this.textBox1.TextChanged += new TextChangedEventHandler(TextBox1_TextChanged);
this.txtErrorShow.TextChanged += new TextChangedEventHandler(txtErrorShow_TextChanged);
}
void txtErrorShow_TextChanged(object sender, TextChangedEventArgs e)
{
if (!string.IsNullOrEmpty(this.txtErrorShow.Text) && txtErrorShow.Text.ToLower() == "true")
{
IsErrorShowBorder.Visibility = Visibility.Visible;
}
else
{
IsErrorShowBorder.Visibility = Visibility.Hidden;
}
}
void TextBox1_TextChanged(object sender, TextChangedEventArgs e)
{
if (TextValue != null && TextValue.Length > 0 && !this.textBox1.IsFocused)
{
this.textBox1.Text = TextValue;
}
else if (!string.IsNullOrEmpty(this.textBox1.Text) || this.textBox1.IsFocused)
{
this.textBox1.Text = this.textBox1.Text;
}
else
{
this.textBox1.Text = Watermark;
}
if (this.textBox1.Text != Watermark)
{
TextValue = this.textBox1.Text;
}
if (this.textBox1.Text != Watermark && this.textBox1.IsFocused)
{
IsErrorShowBorder.Visibility = Visibility.Hidden;
}
}
void WateMarkTextbox_LostFocus(object sender, RoutedEventArgs e)
{
if (string.IsNullOrEmpty(this.textBox1.Text))
{
this.textBox1.Text = Watermark;
}
}
void WateMarkTextbox_GotFocus(object sender, RoutedEventArgs e)
{
if (this.textBox1.Text.Equals(Watermark))
{
this.textBox1.Text = string.Empty;
}
}
void WateMarkTextbox_Loaded(object sender, RoutedEventArgs e)
{
this.textBox1.Text = Watermark;
this.IsInput.Content = IsRequired;
this.IsError.Content = IsErrorMessage;
this.textBox1.MaxLength = Convert.ToInt32(MaxLength);
}
public string Watermark
{
get
{
string result = (string)GetValue(WatermarkProperty);
if (string.IsNullOrEmpty(result))
{
result = defaultText;
}
return result;
}
set { SetValue(WatermarkProperty, value); }
}
public string IsRequired
{
get
{
string result = (string)GetValue(IsRequiredProperty);
if (string.IsNullOrEmpty(result))
{
result = IsInputText;
}
return result;
}
set { SetValue(IsRequiredProperty, value); }
}
public string IsErrorMessage
{
get
{
string result = (string)GetValue(IsErrorMessageProperty);
if (string.IsNullOrEmpty(result))
{
result = IsErrorText;
}
return result;
}
set { SetValue(IsErrorMessageProperty, value); }
}
public string MaxLength
{
get
{
string result = (string)GetValue(IsMaxLengthProperty);
if (string.IsNullOrEmpty(result))
{
result = IsMaxLength;
}
return result;
}
set { SetValue(IsMaxLengthProperty, value); }
}
public string IsErrorShow
{
set
{
txtErrorShow.Text = null;
txtErrorShow.Text = value;
}
}
public static readonly DependencyProperty WatermarkProperty =
DependencyProperty.Register("Watermark", typeof(string), typeof(SelfWateMarkTextbox), new UIPropertyMetadata(defaultText));
public static readonly DependencyProperty IsRequiredProperty =
DependencyProperty.Register("IsRequired", typeof(string), typeof(SelfWateMarkTextbox), new UIPropertyMetadata(IsInputText));
public static readonly DependencyProperty IsErrorMessageProperty =
DependencyProperty.Register("IsErrorMessage", typeof(string), typeof(SelfWateMarkTextbox), new UIPropertyMetadata(IsErrorText));
public static readonly DependencyProperty IsMaxLengthProperty =
DependencyProperty.Register("MaxLength", typeof(string), typeof(SelfWateMarkTextbox), new UIPropertyMetadata(IsMaxLength));
}
文章标题：WPF自定义控件Textbox 带水印 以及错误信息显示_02
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