Silverlight的数字文本框？ [英] Silverlight numeric textbox?
本文介绍了Silverlight的数字文本框？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我tryed在这里创建自己的数字文本框是我的代码：
公共类NumericTextBox：文本框
{
公共NumericTextBox（）
：碱（）
{
this.Text =0;
}
私人无效HandleKeyEvent（KeyEventArgs E）
{
e.Handled = TRUE;
如果（（Keyboard.Modifiers&安培;！ModifierKeys.Alt）= 0）
{
的回报;
}
如果（e.Key == || Key.Back == e.Key || Key.Delete == e.Key || Key.Left == e.Key Key.Right | |
e.Key == || Key.D0 == e.Key || Key.D1 == e.Key || Key.D2 == e.Key || Key.D3 == e.Key Key.D4 || e.Key == || Key.D5 == e.Key || Key.D6
e.Key == || Key.D7 == e.Key || Key.D8Ë 。重点== || Key.D9
e.Key == || Key.NumPad0 == e.Key || Key.NumPad1 == e.Key || Key.NumPad2 == e.Key重点。 NUMPAD3 || e.Key == || Key.NumPad4 == e.Key || Key.NumPad5 == e.Key || Key.NumPad6
e.Key == || Key.NumPad7 e.Key == || Key.NumPad8 == e.Key Key.NumPad9）
{
e.Handled = FALSE;
}
，否则如果（（e.Key == || Key.Subtract（e.Key == Key.Unknown&放大器;&安培; e.PlatformKeyCode == 189））及和放大器;基地。 SelectionStart == 0安培;及（！base.Text.Length == 0 || base.Text [0] =' - '））
{
e.Handled = FALSE;
}
}
保护覆盖无效的onkeydown（KeyEventArgs E）
{
HandleKeyEvent（E）;
base.OnKeyDown（E）;
}
保护覆盖无效的onkeyup（KeyEventArgs E）
{
HandleKeyEvent（E）;
base.OnKeyUp（E）;
}
}
一切工作像应该，但如果您按下ALT和一些数它创建对应数字的ASCII符号..有什么办法来阻止ALT +数字的组合？
似乎ALT +键只是获取而不去扔的onkeyup或...的onkeydown
解决方案
我把它用在这里使用TextChanged事件的工作是我的代码...
公共类NumericTextBox：文本框
{
int值;
公共NumericTextBox（）
：基（）
{
this.Text =0;
this.TextChanged =新TextChangedEventHandler（NumericTextBox_TextChanged）;
}
空隙NumericTextBox_TextChanged （对象发件人，TextChangedEventArgs E）
{
INT selectionStart = base.SelectionStart;
布尔改变= FALSE;
名单<焦炭> charList =新的List<焦炭>（）;
的for（int i = 0; I< base.Text.Length;我++）
{
如果（IsValidChar（base.Text [I]，i））的
{
charList.Add（base.Text [I]）;
}
，否则
{
如果（selectionStart> = 1）
{
selectionStart--;
}
改变= TRUE;
}
}
如果（更改）
{
字符串文本=新的字符串（charList.ToArray（））;
this.Text =文本;
this.SelectionStart = selectionStart;
}
INT为newValue;
如果（int.TryParse（this.Text，出newValue）以！）
{
this.Text = value.ToString（）;
this.SelectionStart = this.Text.Length;
}
，否则
{
值=为newValue;
}
}
私人布尔IsValidChar（字符C，INT指数）
{
回报率（（三==' - '和;&安培;指数== 0）||ç=='0'||ç=='1'||ç=='2'||ç=='3'||ç=='4'||ç== '5'||ç=='6'||ç=='7'||ç=='8'||ç=='9'）;
}
私人无效HandleKeyEvent（KeyEventArgs E）
{
e.Handled = TRUE;
如果（（Keyboard.Modifiers&安培; ModifierKeys.Control）== ModifierKeys.Control）
{
e.Handled = FALSE;
}
如果（e.Key == || Key.Back == e.Key || Key.Delete == e.Key || Key.Left == e.Key Key.Right | |
e.Key == || Key.D0 == e.Key || Key.D1 == e.Key || Key.D2 == e.Key || Key.D3 == e.Key Key.D4 || e.Key == || Key.D5 == e.Key || Key.D6
e.Key == || Key.D7 == e.Key || Key.D8Ë 。重点== || Key.D9
e.Key == || Key.NumPad0 == e.Key || Key.NumPad1 == e.Key || Key.NumPad2 == e.Key重点。 NUMPAD3 || e.Key == || Key.NumPad4 == e.Key || Key.NumPad5 == e.Key || Key.NumPad6
e.Key == || Key.NumPad7 e.Key == || Key.NumPad8 == e.Key Key.NumPad9）
{
e.Handled = FALSE;
}
，否则如果（（e.Key == || Key.Subtract（e.Key == Key.Unknown&放大器;&安培; e.PlatformKeyCode == 189））及和放大器;基地。 SelectionStart == 0安培;及（！base.Text.Length == 0 || base.Text [0] =' - '））
{
e.Handled = FALSE;
}
}
保护覆盖无效的onkeydown（KeyEventArgs E）
{
HandleKeyEvent（E）;
base.OnKeyDown（E）;
}
保护覆盖无效的onkeyup（KeyEventArgs E）
{
HandleKeyEvent（E）;
base.OnKeyUp（E）;
}
}
I tryed to create my own numeric textbox here is my code:
public class NumericTextBox : TextBox
{
public NumericTextBox()
: base()
{
this.Text = "0";
}
private void HandleKeyEvent(KeyEventArgs e)
{
e.Handled = true;
if ((Keyboard.Modifiers & ModifierKeys.Alt) != 0)
{
return;
}
if (e.Key == Key.Back || e.Key == Key.Delete || e.Key == Key.Left || e.Key == Key.Right ||
e.Key == Key.D0 || e.Key == Key.D1 || e.Key == Key.D2 || e.Key == Key.D3 || e.Key == Key.D4 || e.Key == Key.D5 || e.Key == Key.D6 ||
e.Key == Key.D7 || e.Key == Key.D8 || e.Key == Key.D9 ||
e.Key == Key.NumPad0 || e.Key == Key.NumPad1 || e.Key == Key.NumPad2 || e.Key == Key.NumPad3 || e.Key == Key.NumPad4 || e.Key == Key.NumPad5 || e.Key == Key.NumPad6 ||
e.Key == Key.NumPad7 || e.Key == Key.NumPad8 || e.Key == Key.NumPad9)
{
e.Handled = false;
}
else if ((e.Key == Key.Subtract || (e.Key == Key.Unknown && e.PlatformKeyCode == 189)) && base.SelectionStart == 0 && (base.Text.Length == 0 || base.Text[0] != '-'))
{
e.Handled = false;
}
}
protected override void OnKeyDown(KeyEventArgs e)
{
HandleKeyEvent(e);
base.OnKeyDown(e);
}
protected override void OnKeyUp(KeyEventArgs e)
{
HandleKeyEvent(e);
base.OnKeyUp(e);
}
}
everything works like supposed but if you press alt and some numbers it creates the ascii symbol corresponding to the number.. is there any way to block an "alt + number combination? it seems that alt + key just gets entered without going threw OnKeyUp or OnKeyDown...
解决方案
I got it working by using the TextChanged event here is my code...
public class NumericTextBox : TextBox
{
int value;
public NumericTextBox()
: base()
{
this.Text = "0";
this.TextChanged += new TextChangedEventHandler(NumericTextBox_TextChanged);
}
void NumericTextBox_TextChanged(object sender, TextChangedEventArgs e)
{
int selectionStart = base.SelectionStart;
bool changed = false;
List<char> charList = new List<char>();
for (int i = 0; i < base.Text.Length; i++)
{
if (IsValidChar(base.Text[i], i))
{
charList.Add(base.Text[i]);
}
else
{
if (selectionStart >= i)
{
selectionStart--;
}
changed = true;
}
}
if (changed)
{
string text = new string(charList.ToArray());
this.Text = text;
this.SelectionStart = selectionStart;
}
int newValue;
if (!int.TryParse(this.Text, out newValue))
{
this.Text = value.ToString();
this.SelectionStart = this.Text.Length;
}
else
{
value = newValue;
}
}
private bool IsValidChar(char c, int index)
{
return ((c == '-' && index == 0) || c == '0' || c == '1' || c == '2' || c == '3' || c == '4' || c == '5' || c == '6' || c == '7' || c == '8' || c == '9');
}
private void HandleKeyEvent(KeyEventArgs e)
{
e.Handled = true;
if ((Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
e.Handled = false;
}
if (e.Key == Key.Back || e.Key == Key.Delete || e.Key == Key.Left || e.Key == Key.Right ||
e.Key == Key.D0 || e.Key == Key.D1 || e.Key == Key.D2 || e.Key == Key.D3 || e.Key == Key.D4 || e.Key == Key.D5 || e.Key == Key.D6 ||
e.Key == Key.D7 || e.Key == Key.D8 || e.Key == Key.D9 ||
e.Key == Key.NumPad0 || e.Key == Key.NumPad1 || e.Key == Key.NumPad2 || e.Key == Key.NumPad3 || e.Key == Key.NumPad4 || e.Key == Key.NumPad5 || e.Key == Key.NumPad6 ||
e.Key == Key.NumPad7 || e.Key == Key.NumPad8 || e.Key == Key.NumPad9)
{
e.Handled = false;
}
else if ((e.Key == Key.Subtract || (e.Key == Key.Unknown && e.PlatformKeyCode == 189)) && base.SelectionStart == 0 && (base.Text.Length == 0 || base.Text[0] != '-'))
{
e.Handled = false;
}
}
protected override void OnKeyDown(KeyEventArgs e)
{
HandleKeyEvent(e);
base.OnKeyDown(e);
}
protected override void OnKeyUp(KeyEventArgs e)
{
HandleKeyEvent(e);
base.OnKeyUp(e);
}
}
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