Csharp/C Sharp by API/System.Windows.Forms/Keys

Материал из .Net Framework эксперт
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Keys.Control

<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; public class Form1 : Form {

  [DllImport("User32.dll")]
  private static extern short GetAsyncKeyState( System.Windows.Forms.Keys vKey); 
 private System.Windows.Forms.TextBox textBox1;
 private System.Windows.Forms.Label lbl;
 private System.Windows.Forms.Button cmdAsyncState;
 public Form1() {
       InitializeComponent();
 }
 private void Form1_KeyPress(object sender, KeyPressEventArgs e)
 {
   e.Handled = true;
 }
 private void Form1_KeyDown(object sender, KeyEventArgs e)
 {
   lbl.Text = "Key Down: " + e.KeyValue.ToString();
   lbl.Text += "\nKey Code: " + e.KeyCode.ToString();
   lbl.Text += "\nKey Data: " + e.KeyData.ToString();
   if ((e.Modifiers & Keys.Shift) == Keys.Shift)
   {
     lbl.Text += "\n" + "Shift was held down.";
   }
   if ((e.Modifiers & Keys.Control) == Keys.Control)
   {
     lbl.Text += "\n" + "Control was held down.";
   }
   if (e.Alt)
   {
     lbl.Text += "\n" + "Alt was held down.";
   }
 }
 private void cmdAsyncState_Click(object sender, EventArgs e)
 {
   int state = Convert.ToInt32(GetAsyncKeyState(Keys.A).ToString());
   switch (state)
   {
     case 0:
       lbl.Text = "A has not been pressed since the last call.";
       break;
     case 1:
       lbl.Text = "A is not currently pressed, but has been pressed since the last call.";
         break;
     case -32767:
       lbl.Text = "A is currently pressed.";
       break;
   }
 }
 private void InitializeComponent()
 {
   this.textBox1 = new System.Windows.Forms.TextBox();
   this.lbl = new System.Windows.Forms.Label();
   this.cmdAsyncState = new System.Windows.Forms.Button();
   this.SuspendLayout();
   // 
   // textBox1
   // 
   this.textBox1.Location = new System.Drawing.Point(36, 36);
   this.textBox1.Name = "textBox1";
   this.textBox1.Size = new System.Drawing.Size(205, 21);
   this.textBox1.TabIndex = 0;
   this.textBox1.Text = "<Text will never appear here>";
   // 
   // lbl
   // 
   this.lbl.AutoSize = true;
   this.lbl.Location = new System.Drawing.Point(35, 77);
   this.lbl.Name = "lbl";
   this.lbl.Size = new System.Drawing.Size(0, 0);
   this.lbl.TabIndex = 1;
   // 
   // cmdAsyncState
   // 
   this.cmdAsyncState.Location = new System.Drawing.Point(36, 202);
   this.cmdAsyncState.Name = "cmdAsyncState";
   this.cmdAsyncState.Size = new System.Drawing.Size(141, 24);
   this.cmdAsyncState.TabIndex = 2;
   this.cmdAsyncState.Text = "GetAsyncState() for \"A\"";
   this.cmdAsyncState.Click += new System.EventHandler(this.cmdAsyncState_Click);
   // 
   // Form1
   // 
   this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
   this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
   this.ClientSize = new System.Drawing.Size(292, 266);
   this.Controls.Add(this.cmdAsyncState);
   this.Controls.Add(this.lbl);
   this.Controls.Add(this.textBox1);
   this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
   this.KeyPreview = true;
   this.Name = "Form1";
   this.Text = "KeyTest";
   this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Form1_KeyPress);
   this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);
   this.ResumeLayout(false);
   this.PerformLayout();
 }
 [STAThread]
 static void Main()
 {
   Application.EnableVisualStyles();
   Application.Run(new Form1());
 }

}


 </source>


Keys.Escape

<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Text; namespace KeyboardSample {

   public class KeyboardSample : System.Windows.Forms.Form
   {
     private System.Windows.Forms.TextBox textBox1;
     private System.Windows.Forms.TextBox textBox2;
     private System.Windows.Forms.GroupBox groupBox1;
     private System.Windows.Forms.Label label1;
     private System.Windows.Forms.GroupBox groupBox2;
     private System.Windows.Forms.Label label2;
       private System.ruponentModel.Container components = null;
       public KeyboardSample()
       {
           InitializeComponent();
       }
       private void InitializeComponent()
       {
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.textBox2 = new System.Windows.Forms.TextBox();
        this.groupBox1 = new System.Windows.Forms.GroupBox();
        this.label1 = new System.Windows.Forms.Label();
        this.groupBox2 = new System.Windows.Forms.GroupBox();
        this.label2 = new System.Windows.Forms.Label();
        this.groupBox1.SuspendLayout();
        this.groupBox2.SuspendLayout();
        this.SuspendLayout();
        // 
        // textBox1
        // 
        this.textBox1.Location = new System.Drawing.Point(16, 24);
        this.textBox1.Name = "textBox1";
        this.textBox1.Size = new System.Drawing.Size(168, 20);
        this.textBox1.TabIndex = 5;
        this.textBox1.Text = "";
        this.textBox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox1_KeyDown);
        // 
        // textBox2
        // 
        this.textBox2.Location = new System.Drawing.Point(16, 24);
        this.textBox2.Name = "textBox2";
        this.textBox2.Size = new System.Drawing.Size(168, 20);
        this.textBox2.TabIndex = 6;
        this.textBox2.Text = "";
        this.textBox2.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox2_KeyDown);
        // 
        // groupBox1
        // 
        this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                               this.label1,
                                                                               this.textBox1});
        this.groupBox1.Location = new System.Drawing.Point(8, 8);
        this.groupBox1.Name = "groupBox1";
        this.groupBox1.TabIndex = 7;
        this.groupBox1.TabStop = false;
        this.groupBox1.Text = "Key Monitor";
        // 
        // label1
        // 
        this.label1.Location = new System.Drawing.Point(16, 64);
        this.label1.Name = "label1";
        this.label1.Size = new System.Drawing.Size(168, 20);
        this.label1.TabIndex = 6;
        // 
        // groupBox2
        // 
        this.groupBox2.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                               this.textBox2,
                                                                               this.label2});
        this.groupBox2.Location = new System.Drawing.Point(8, 120);
        this.groupBox2.Name = "groupBox2";
        this.groupBox2.TabIndex = 8;
        this.groupBox2.TabStop = false;
        this.groupBox2.Text = "Keys Enumeration";
        // 
        // label2
        // 
        this.label2.Location = new System.Drawing.Point(16, 64);
        this.label2.Name = "label2";
        this.label2.Size = new System.Drawing.Size(168, 20);
        this.label2.TabIndex = 9;
        // 
        // KeyboardSample
        // 
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(216, 229);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                     this.groupBox2,
                                                                     this.groupBox1});
        this.Name = "KeyboardSample";
        this.Text = "KeyboardSample";
        this.groupBox1.ResumeLayout(false);
        this.groupBox2.ResumeLayout(false);
        this.ResumeLayout(false);
     }
       [STAThread]
       static void Main() 
       {
           Application.Run(new KeyboardSample());
       }
     private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
     {
        label1.Text = Convert.ToString(e.KeyValue);
     }
     private void textBox2_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
     {
        StringBuilder sb = new StringBuilder();
        if(e.Shift) sb.Append("Shift, ");
        if(e.Alt) sb.Append("Alt, ");
        if(e.Control) sb.Append("Ctrl, ");
                   
        if(e.KeyCode==Keys.W||e.KeyCode==Keys.R||e.KeyCode==Keys.O||e.KeyCode==Keys.X)
        {
           sb.Append("Wrox Press!!");
        }
        else if(e.KeyCode==Keys.Escape&&e.Modifiers==(Keys.Shift|Keys.Alt))
        {
           sb.Append("Escape - that won"t work!");
        }
        else if(e.KeyCode == Keys.C && e.Modifiers==(Keys.Alt | Keys.Control))
        {
           sb.Append("CopyRight");
           textBox2.SelectedText = "CopyRight";
           textBox2.SelectionLength = 0;
        }
        else 
        {
           sb.Append(Convert.ToString(e.KeyData));
        }
        label2.Text = sb.ToString();
     }
   }

}

 </source>


Keys.X

<source lang="csharp"> using System; using System.Drawing; using System.Windows.Forms;

class ExitOnX: Form {

    public static void Main()
    {
         Application.Run(new ExitOnX());
    }
    public ExitOnX()
    {
         Text = "Exit on X";
    }
    protected override void OnKeyDown(KeyEventArgs kea)
    {
         if (kea.KeyCode == Keys.X)
              Close();
    }

}

 </source>