如何在wpf计算器中使用键盘
当我尝试获取结果时，“回车”按钮不起作用如何在wpf计算器中使用键盘,wpf,Wpf,当我尝试获取结果时，“回车”按钮不起作用 public partial class Window1 : Window { static MyTextBox DisplayBox; static MyTextBox PaperBox; static PaperTrail Paper; public Window1() : base() { InitializeComponent(); //sub-class
public partial class Window1 : Window
{
static MyTextBox DisplayBox;
static MyTextBox PaperBox;
static PaperTrail Paper;
public Window1()
: base()
{
InitializeComponent();
//sub-class our textBox
//DisplayBox = new MyTextBox();
//Grid.SetRow(DisplayBox, 0);
//Grid.SetColumn(DisplayBox, 0);
//Grid.SetColumnSpan(DisplayBox, 9);
//DisplayBox.Height = 30;
//MyGrid.Children.Add(DisplayBox);
//sub-class our paper trail textBox
PaperBox = new MyTextBox();
Grid.SetRow(PaperBox, 1);
Grid.SetColumn(PaperBox, 0);
Grid.SetColumnSpan(PaperBox, 3);
Grid.SetRowSpan(PaperBox, 5);
PaperBox.IsReadOnly = true;
PaperBox.VerticalScrollBarVisibility = ScrollBarVisibility.Visible;
PaperBox.Margin = new Thickness(3.0,1.0,1.0,1.0);
PaperBox.HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;
Paper = new PaperTrail();
MyGrid.Children.Add(PaperBox);
ProcessKey('0');
EraseDisplay = true;
}
private enum Operation
{
None,
Devide,
Multiply,
Subtract,
Add,
Percent,
Sqrt,
OneX,
Negate
}
private Operation LastOper;
private string _display;
private string _last_val;
private string _mem_val;
private bool _erasediplay;
//flag to erase or just add to current display flag
private bool EraseDisplay
{
get
{
return _erasediplay;
}
set
{
_erasediplay = value;
}
}
//Get/Set Memory cell value
private Double Memory
{
get
{
if (_mem_val == string.Empty)
return 0.0;
else
return Convert.ToDouble(_mem_val);
}
set
{
_mem_val = value.ToString();
}
}
//Lats value entered
private string LastValue
{
get
{
if (_last_val == string.Empty)
return "0";
return _last_val;
}
set
{
_last_val = value;
}
}
//The current Calculator display
private string Display
{
get
{
return _display;
}
set
{
_display = value;
}
}
// Sample event handler:
private void OnWindowKeyDown(object sender, System.Windows.Input.TextCompositionEventArgs /*System.Windows.Input.KeyEventArgs*/ e)
{
string s = e.Text;
char c = (s.ToCharArray())[0];
e.Handled = true;
if ((c >= '0' && c <= '9') || c == '.' || c == '\b') // '\b' is backspace
{
ProcessKey(c);
return;
}
switch (c)
{
case '+':
ProcessOperation("BPlus");
break;
case '-':
ProcessOperation("BMinus");
break;
case '*':
ProcessOperation("BMultiply");
break;
case '/':
ProcessOperation("BDevide");
break;
case '%':
ProcessOperation("BPercent");
break;
case '=':
ProcessOperation("BEqual");
break;
}
}
private void DigitBtn_Click(object sender, RoutedEventArgs e)
{
string s = ((Button)sender).Content.ToString();
//char[] ids = ((Button)sender).ID.ToCharArray();
char[] ids = s.ToCharArray();
ProcessKey(ids[0]);
}
private void ProcessKey(char c)
{
if (EraseDisplay)
{
Display = string.Empty;
EraseDisplay = false;
}
AddToDisplay(c);
}
private void ProcessOperation(string s)
{
Double d = 0.0;
switch (s)
{
case "BPM":
LastOper = Operation.Negate;
LastValue = Display;
CalcResults();
LastValue = Display;
EraseDisplay = true;
LastOper = Operation.None;
break;
case "BDevide":
if (EraseDisplay) //stil wait for a digit...
{ //stil wait for a digit...
LastOper = Operation.Devide;
break;
}
CalcResults();
LastOper = Operation.Devide;
LastValue = Display;
EraseDisplay = true;
break;
case "BMultiply":
if (EraseDisplay) //stil wait for a digit...
{ //stil wait for a digit...
LastOper = Operation.Multiply;
break;
}
CalcResults();
LastOper = Operation.Multiply;
LastValue = Display;
EraseDisplay = true;
break;
case "BMinus":
if (EraseDisplay) //stil wait for a digit...
{ //stil wait for a digit...
LastOper = Operation.Subtract;
break;
}
CalcResults();
LastOper = Operation.Subtract;
LastValue = Display;
EraseDisplay = true;
break;
case "BPlus":
if (EraseDisplay)
{ //stil wait for a digit...
LastOper = Operation.Add;
break;
}
CalcResults();
LastOper = Operation.Add;
LastValue = Display;
EraseDisplay = true;
break;
case "BEqual":
if (EraseDisplay) //stil wait for a digit...
break;
CalcResults();
EraseDisplay = true;
LastOper = Operation.None;
LastValue = Display;
//val = Display;
break;
case "BSqrt":
LastOper = Operation.Sqrt;
LastValue = Display;
CalcResults();
LastValue = Display;
EraseDisplay = true;
LastOper = Operation.None;
break;
case "BPercent":
if (EraseDisplay) //stil wait for a digit...
{ //stil wait for a digit...
LastOper = Operation.Percent;
break;
}
CalcResults();
LastOper = Operation.Percent;
LastValue = Display;
EraseDisplay = true;
//LastOper = Operation.None;
break;
case "BOneOver":
LastOper = Operation.OneX;
LastValue = Display;
CalcResults();
LastValue = Display;
EraseDisplay = true;
LastOper = Operation.None;
break;
case "BC": //clear All
LastOper = Operation.None;
Display = LastValue = string.Empty;
Paper.Clear();
UpdateDisplay();
break;
case "BCE": //clear entry
LastOper = Operation.None;
Display = LastValue;
UpdateDisplay();
break;
case "BMemClear":
Memory = 0.0F;
DisplayMemory();
break;
case "BMemSave":
Memory = Convert.ToDouble(Display);
DisplayMemory();
EraseDisplay = true;
break;
case "BMemRecall":
Display = /*val =*/ Memory.ToString();
UpdateDisplay();
//if (LastOper != Operation.None) //using MR is like entring a digit
EraseDisplay = false;
break;
case "BMemPlus":
d = Memory + Convert.ToDouble(Display);
Memory = d;
DisplayMemory();
EraseDisplay = true;
break;
}
}
private void OperBtn_Click(object sender, RoutedEventArgs e)
{
ProcessOperation(((Button)sender).Name.ToString());
}
private double Calc(Operation LastOper)
{
double d = 0.0;
try {
switch (LastOper)
{
case Operation.Devide:
Paper.AddArguments(LastValue + " / " + Display);
d = (Convert.ToDouble(LastValue) / Convert.ToDouble(Display));
CheckResult(d);
Paper.AddResult(d.ToString());
break;
case Operation.Add:
Paper.AddArguments(LastValue + " + " + Display);
d = Convert.ToDouble(LastValue) + Convert.ToDouble(Display);
CheckResult(d);
Paper.AddResult(d.ToString());
break;
case Operation.Multiply:
Paper.AddArguments(LastValue + " * " + Display);
d = Convert.ToDouble(LastValue) * Convert.ToDouble(Display);
CheckResult(d);
Paper.AddResult(d.ToString());
break;
case Operation.Percent:
//Note: this is different (but make more sense) then Windows calculator
Paper.AddArguments(LastValue + " % " + Display);
d = (Convert.ToDouble(LastValue) * Convert.ToDouble(Display)) / 100.0F;
CheckResult(d);
Paper.AddResult(d.ToString());
break;
case Operation.Subtract:
Paper.AddArguments(LastValue + " - " + Display);
d = Convert.ToDouble(LastValue) - Convert.ToDouble(Display);
CheckResult(d);
Paper.AddResult(d.ToString());
break;
case Operation.Sqrt:
Paper.AddArguments("Sqrt( " + LastValue + " )");
d = Math.Sqrt(Convert.ToDouble(LastValue));
CheckResult(d);
Paper.AddResult(d.ToString());
break;
case Operation.OneX:
Paper.AddArguments("1 / " + LastValue);
d = 1.0F / Convert.ToDouble(LastValue);
CheckResult(d);
Paper.AddResult(d.ToString());
break;
case Operation.Negate:
d = Convert.ToDouble(LastValue) * (-1.0F);
break;
}
}
catch {
d = 0;
Window parent = (Window)MyPanel.Parent;
Paper.AddResult("Error");
MessageBox.Show(parent, "Operation cannot be perfomed", parent.Title);
}
return d;
}
private void CheckResult(double d)
{
if (Double.IsNegativeInfinity(d) || Double.IsPositiveInfinity(d) || Double.IsNaN(d))
throw new Exception("Illegal value");
}
private void DisplayMemory()
{
if (_mem_val != String.Empty)
BMemBox.Text = "Memory: " + _mem_val;
else
BMemBox.Text = "Memory: [empty]";
}
private void CalcResults()
{
double d;
if (LastOper == Operation.None)
return;
d = Calc(LastOper);
Display = d.ToString();
UpdateDisplay();
}
private void UpdateDisplay()
{
if (Display == String.Empty)
DisplayBox.Text = "0";
else
DisplayBox.Text = Display;
}
private void AddToDisplay(char c)
{
if (c == '.')
{
if (Display.IndexOf('.', 0) >= 0) //already exists
return;
Display = Display + c;
}
else
{
if (c >= '0' && c <= '9') {
Display = Display + c;
}
else
if (c == '\b') //backspace ?
{
if (Display.Length <= 1)
Display = String.Empty;
else
{
int i = Display.Length;
Display = Display.Remove(i - 1, 1); //remove last char
}
}
}
UpdateDisplay();
}
void OnMenuAbout(object sender, RoutedEventArgs e)
{
Window parent = (Window)MyPanel.Parent;
MessageBox.Show(parent, parent.Title + " - By Jossef Goldberg ", parent.Title,MessageBoxButton.OK, MessageBoxImage.Information);
}
void OnMenuExit(object sender, RoutedEventArgs e)
{
this.Close();
}
void OnMenuStandard(object sender, RoutedEventArgs e)
{
//((MenuItem)ScientificMenu).IsChecked = false;
((MenuItem)StandardMenu).IsChecked = true; //for now always Standard
}
//Not implemenetd
void OnMenuScientific(object sender, RoutedEventArgs e)
{
//((MenuItem)StandardMenu).IsChecked = false;
}
private class PaperTrail
{
string args;
public PaperTrail()
{
}
public void AddArguments(string a)
{
args = a;
}
public void AddResult(string r)
{
PaperBox.Text += args + " = " + r + "\n";
}
public void Clear()
{
PaperBox.Text = string.Empty;
args = string.Empty;
}
}
}
公共部分类窗口1:窗口
{
静态MyTextBox显示框；
静态MyTextBox纸盒；
静态文件；
公共窗口1（）
：base（）
{
初始化组件（）；
//我们的文本框的子类
//DisplayBox=新的MyTextBox（）；
//Grid.SetRow（显示框，0）；
//Grid.SetColumn（显示框，0）；
//Grid.SetColumnSpan（显示框，9）；
//显示框，高度=30；
//MyGrid.Children.Add（显示框）；
//子类我们的文件跟踪文本框
纸盒=新的MyTextBox（）；
网格。SetRow（纸盒，1）；
网格设置列（纸盒，0）；
网格.SetColumnSpan（纸盒，3）；
网格设置行跨度（纸盒，5）；
PaperBox.IsReadOnly=true；
PaperBox.VerticalScrollBarVisibility=ScrollBarVisibility.Visible；
纸盒。边距=新厚度（3.0,1.0,1.0,1.0）；
PaperBox.HorizontalScrollBarVisibility=ScrollBarVisibility.Auto；
纸张=新的书面材料（）；
MyGrid.Children.Add（纸盒）；
ProcessKey（'0'）；
擦除显示=真；
}
私有枚举操作
{
没有一个
德维德，
乘，
减去，
添加
百分比
Sqrt，
OneX，
否定
}
私人经营；
私有字符串显示；
私有字符串_last_val；
私有字符串_mem_val；
私人布卢迪普拉；
//要删除或仅添加到当前显示标志的标志
专用布尔显示器
{
得到
{
返回(擦除)显示;；
}
设置
{
_擦除diplay=值；
}
}
//获取/设置内存单元值
专用双存储器
{
得到
{
if（_mem_val==string.Empty）
返回0.0；
其他的
返回Convert.ToDouble（_mem_val）；
}
设置
{
_mem_val=value.ToString（）；
}
}
//输入的Lats值
私有字符串值
{
得到
{
if（_last_val==string.Empty）
返回“0”；
返回最后一个值；
}
设置
{
_last_val=值；
}
}
//当前计算器显示
专用字符串显示
{
得到
{
返回显示；
}
设置
{
_显示=值；
}
}
//事件处理程序示例：
私有void OnWindowKeyDown（对象发送方，System.Windows.Input.TextCompositionEventArgs/*System.Windows.Input.KeyEventArgs*/e）
{
字符串s=e.Text；
charc=（s.ToCharArray（））[0]；
e、 已处理=正确；
如果（（c>='0'&&c=0）//已存在
返回；
显示=显示+c；
}
其他的
{
如果（c>='0'&&c Hi swetha感谢您的回答，您能告诉我哪些代码应该在块中吗？您应该在块中放置计算器
private void _KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter || e.Key == Key.Tab)
{
//YourCode
}
}
private void txtEdtDisplayBox_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
string rest = txtEdtDisplayBox.Text;
string[] seperaateNumbers;
seperaateNumbers = rest.Split('+');
if (seperaateNumbers.Count() > 1)
{
txtEdtDisplayBox.Text = Convert.ToString(Convert.ToInt64(seperaateNumbers[0]) + Convert.ToInt64(seperaateNumbers[1]));
//MessageBox.Show( Convert.ToString(Convert.ToInt64(seperaateNumbers[0]) + Convert.ToInt64(seperaateNumbers[1])));
}
else
{
DXMessageBox.Show("Wrong Operation","Error", MessageBoxButton.OK,MessageBoxImage.Error);
}
seperaateNumbers = rest.Split('-');
if (seperaateNumbers.Count() > 1)
{
txtEdtDisplayBox.Text = Convert.ToString(Convert.ToInt64(seperaateNumbers[0]) + Convert.ToInt64(seperaateNumbers[1]));
}
seperaateNumbers = rest.Split('*');
if (seperaateNumbers.Count() > 1)
{
txtEdtDisplayBox.Text = Convert.ToString(Convert.ToInt64(seperaateNumbers[0]) + Convert.ToInt64(seperaateNumbers[1]));
}
seperaateNumbers = rest.Split('/');
if (seperaateNumbers.Count() > 1)
{
txtEdtDisplayBox.Text = Convert.ToString(Convert.ToInt64(seperaateNumbers[0]) + Convert.ToInt64(seperaateNumbers[1]));
}
}
}