我更改了Vitalyb的代码以支持颜色主题。如果用户输入不符合regex脚本,它不会阻止用户输入,而是突出显示文本框。文本框将是没有交互的主题默认值,然后根据输入设置后的值默认为浅绿色或红色。还可以通过编程设置失败和通过颜色:
b:ColorMasking.PassColor = "Hexadecimal Value"
b:ColorMasking.FailColor = "Hexadecimal Value"
课程如下:
public class ColorMasking : DependencyObject
{
private static readonly DependencyPropertyKey _maskExpressionPropertyKey = DependencyProperty.RegisterAttachedReadOnly("MaskExpression",
typeof(Regex),
typeof(ColorMasking),
new FrameworkPropertyMetadata());
/// <summary>
/// Identifies the <see cref="Mask"/> dependency property.
/// </summary>
///
public static readonly DependencyProperty PassColorProperty = DependencyProperty.RegisterAttached("PassColor",
typeof(string),
typeof(ColorMasking),
new PropertyMetadata("#99FF99"));
public static void SetPassColor(DependencyObject obj, string passColor)
{
obj.SetValue(PassColorProperty, passColor);
}
public static string GetPassColor(DependencyObject obj)
{
return (string)obj.GetValue(PassColorProperty);
}
public static readonly DependencyProperty FailColorProperty = DependencyProperty.RegisterAttached("FailColor",
typeof(string),
typeof(ColorMasking),
new PropertyMetadata("#FFCCFF"));
public static void SetFailColor(DependencyObject obj, string failColor)
{
obj.SetValue(FailColorProperty, failColor);
}
public static string GetFailColor(DependencyObject obj)
{
return (string)obj.GetValue(FailColorProperty);
}
public static readonly DependencyProperty MaskProperty = DependencyProperty.RegisterAttached("Mask",
typeof(string),
typeof(ColorMasking),
new FrameworkPropertyMetadata(OnMaskChanged));
private static void OnPassColorChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
var textBox = dependencyObject as TextBox;
var color = e.NewValue as string;
textBox.SetValue(PassColorProperty, color);
}
/// <summary>
/// Identifies the <see cref="MaskExpression"/> dependency property.
/// </summary>
public static readonly DependencyProperty MaskExpressionProperty = _maskExpressionPropertyKey.DependencyProperty;
/// <summary>
/// Gets the mask for a given <see cref="TextBox"/>.
/// </summary>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask is to be retrieved.
/// </param>
/// <returns>
/// The mask, or <see langword="null"/> if no mask has been set.
/// </returns>
public static string GetMask(TextBox textBox)
{
if (textBox == null)
{
throw new ArgumentNullException("textBox");
}
return textBox.GetValue(MaskProperty) as string;
}
/// <summary>
/// Sets the mask for a given <see cref="TextBox"/>.
/// </summary>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask is to be set.
/// </param>
/// <param name="mask">
/// The mask to set, or <see langword="null"/> to remove any existing mask from <paramref name="textBox"/>.
/// </param>
public static void SetMask(TextBox textBox, string mask)
{
if (textBox == null)
{
throw new ArgumentNullException("textBox");
}
textBox.SetValue(MaskProperty, mask);
}
/// <summary>
/// Gets the mask expression for the <see cref="TextBox"/>.
/// </summary>
/// <remarks>
/// This method can be used to retrieve the actual <see cref="Regex"/> instance created as a result of setting the mask on a <see cref="TextBox"/>.
/// </remarks>
/// <param name="textBox">
/// The <see cref="TextBox"/> whose mask expression is to be retrieved.
/// </param>
/// <returns>
/// The mask expression as an instance of <see cref="Regex"/>, or <see langword="null"/> if no mask has been applied to <paramref name="textBox"/>.
/// </returns>
public static Regex GetMaskExpression(TextBox textBox)
{
if (textBox == null)
{
throw new ArgumentNullException("textBox");
}
return textBox.GetValue(MaskExpressionProperty) as Regex;
}
private static void SetMaskExpression(TextBox textBox, Regex regex)
{
textBox.SetValue(_maskExpressionPropertyKey, regex);
}
private static void OnMaskChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
var textBox = dependencyObject as TextBox;
var mask = e.NewValue as string;
textBox.PreviewTextInput -= textBox_PreviewTextInput;
textBox.PreviewKeyDown -= textBox_PreviewKeyDown;
DataObject.RemovePastingHandler(textBox, Pasting);
DataObject.RemoveCopyingHandler(textBox, NoDragCopy);
CommandManager.RemovePreviewExecutedHandler(textBox, NoCutting);
if (mask == null)
{
textBox.ClearValue(MaskProperty);
textBox.ClearValue(MaskExpressionProperty);
}
else
{
textBox.SetValue(MaskProperty, mask);
SetMaskExpression(textBox, new Regex(mask, RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace));
textBox.PreviewTextInput += textBox_PreviewTextInput;
textBox.PreviewKeyDown += textBox_PreviewKeyDown;
DataObject.AddPastingHandler(textBox, Pasting);
DataObject.AddCopyingHandler(textBox, NoDragCopy);
CommandManager.AddPreviewExecutedHandler(textBox, NoCutting);
}
}
private static void NoCutting(object sender, ExecutedRoutedEventArgs e)
{
if (e.Command == ApplicationCommands.Cut)
{
e.Handled = true;
}
}
private static void NoDragCopy(object sender, DataObjectCopyingEventArgs e)
{
if (e.IsDragDrop)
{
e.CancelCommand();
}
}
private static void textBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
string passHex = (string)textBox.GetValue(PassColorProperty);
string failHex = (string)textBox.GetValue(FailColorProperty);
Color passColor = Extensions.ToColorFromHex(passHex);
Color failColor = Extensions.ToColorFromHex(failHex);
if (maskExpression == null)
{
return;
}
var proposedText = GetProposedText(textBox, e.Text);
if (!maskExpression.IsMatch(proposedText))
{
textBox.Background = new SolidColorBrush(failColor);
}
else
{
textBox.Background = new SolidColorBrush(passColor);
}
}
private static void textBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
var textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
string passHex = (string)textBox.GetValue(PassColorProperty);
string failHex = (string)textBox.GetValue(FailColorProperty);
Color passColor = Extensions.ToColorFromHex(passHex);
Color failColor = Extensions.ToColorFromHex(failHex);
if (maskExpression == null)
{
return;
}
string proposedText = null;
//pressing space doesn't raise PreviewTextInput, reasons here http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/446ec083-04c8-43f2-89dc-1e2521a31f6b?prof=required
if (e.Key == Key.Space)
{
proposedText = GetProposedText(textBox, " ");
}
// Same story with backspace
else if (e.Key == Key.Back)
{
proposedText = GetProposedTextBackspace(textBox);
}
if (proposedText != null && !maskExpression.IsMatch(proposedText))
{
textBox.Background = new SolidColorBrush(failColor);
}
else
{
textBox.Background = new SolidColorBrush(passColor);
}
}
private static void Pasting(object sender, DataObjectPastingEventArgs e)
{
TextBox textBox = sender as TextBox;
var maskExpression = GetMaskExpression(textBox);
string passHex = (string)textBox.GetValue(PassColorProperty);
string failHex = (string)textBox.GetValue(FailColorProperty);
Color passColor = Extensions.ToColorFromHex(passHex);
Color failColor = Extensions.ToColorFromHex(failHex);
if (maskExpression == null)
{
return;
}
if (e.DataObject.GetDataPresent(typeof(string)))
{
var pastedText = e.DataObject.GetData(typeof(string)) as string;
var proposedText = GetProposedText(textBox, pastedText);
if (!maskExpression.IsMatch(proposedText))
{
textBox.Background = new SolidColorBrush(failColor);
}
else
{
textBox.Background = new SolidColorBrush(passColor);
}
}
else
{
textBox.Background = new SolidColorBrush(failColor);
}
}
private static string GetProposedTextBackspace(TextBox textBox)
{
var text = GetTextWithSelectionRemoved(textBox);
if (textBox.SelectionStart > 0)
{
text = text.Remove(textBox.SelectionStart - 1, 1);
}
return text;
}
private static string GetProposedText(TextBox textBox, string newText)
{
var text = GetTextWithSelectionRemoved(textBox);
text = text.Insert(textBox.CaretIndex, newText);
return text;
}
private static string GetTextWithSelectionRemoved(TextBox textBox)
{
var text = textBox.Text;
if (textBox.SelectionStart != -1)
{
text = text.Remove(textBox.SelectionStart, textBox.SelectionLength);
}
return text;
}
}
要运行该脚本,需要Aaron C编写的类,解释如下:
Silverlight/WPF sets ellipse with hexadecimal colour
这里显示:
http://www.wiredprairie.us/blog/index.php/archives/659
如果网站被移动,代码如下:
public static class Extensions
{
public static void SetFromHex(this Color c, string hex)
{
Color c1 = ToColorFromHex(hex);
c.A = c1.A;
c.R = c1.R;
c.G = c1.G;
c.B = c1.B;
}
public static Color ToColorFromHex(string hex)
{
if (string.IsNullOrEmpty(hex))
{
throw new ArgumentNullException("hex");
}
// remove any "#" characters
while (hex.StartsWith("#"))
{
hex = hex.Substring(1);
}
int num = 0;
// get the number out of the string
if (!Int32.TryParse(hex, System.Globalization.NumberStyles.HexNumber, null, out num))
{
throw new ArgumentException("Color not in a recognized Hex format.");
}
int[] pieces = new int[4];
if (hex.Length > 7)
{
pieces[0] = ((num >> 24) & 0x000000ff);
pieces[1] = ((num >> 16) & 0x000000ff);
pieces[2] = ((num >> 8) & 0x000000ff);
pieces[3] = (num & 0x000000ff);
}
else if (hex.Length > 5)
{
pieces[0] = 255;
pieces[1] = ((num >> 16) & 0x000000ff);
pieces[2] = ((num >> 8) & 0x000000ff);
pieces[3] = (num & 0x000000ff);
}
else if (hex.Length == 3)
{
pieces[0] = 255;
pieces[1] = ((num >> 8) & 0x0000000f);
pieces[1] += pieces[1] * 16;
pieces[2] = ((num >> 4) & 0x000000f);
pieces[2] += pieces[2] * 16;
pieces[3] = (num & 0x000000f);
pieces[3] += pieces[3] * 16;
}
return Color.FromArgb((byte)pieces[0], (byte)pieces[1], (byte)pieces[2], (byte)pieces[3]);
}
}
