Mono で GUI プログラミング (2)

C# の練習に、電卓プログラムを作ってみました。Fedora では、mono 用の IDE として MonoDevelop が利用できますが、GUI については Gkt# が利用できるようになっており、.NET Framework の Form クラスを手軽に利用出来るようになっていなかったので、とりあえずテキストエディタでガリガリ記述してみました。

やや長いですが、ソース (dentaku.cs) を以下に示します。

///////////////////////////////////////////////////////////////////////////////
//  dentaku.cs - 電卓プログラム
//
//  created by Fuhito Suguri, 31-Jul-2010
///////////////////////////////////////////////////////////////////////////////
using System;
using System.Drawing;
using System.Windows.Forms;
//
namespace bitWalk
{
  class Program
  {
    static void Main()
    {
      Application.Run(new Dentaku());
    }
  }
  /////////////////////////////////////////////////////////////////////////////
  // class Dentaku
  /////////////////////////////////////////////////////////////////////////////
  class Dentaku : Form
  {
    // DISPLAY
    private Label lab_0;
    // KEY
    private Button but_dot;
    private Button but_equal;
    private Button but_plus;
    private Button but_minus;
    private Button but_mul;
    private Button but_div;
    private Button but_mrc;
    private Button but_mminus;
    private Button but_mplus;
    private Button but_clear;
    private Button but_sign;
    private Button but_percent;
    private Button but_root;
    private Button but_00;
    private Button but_0;
    private Button but_1;
    private Button but_2;
    private Button but_3;
    private Button but_4;
    private Button but_5;
    private Button but_6;
    private Button but_7;
    private Button but_8;
    private Button but_9;
    // background color of KEY
    private Color bgcolor_Disp = Color.PaleGreen;
    private Color bgcolor_Num  = Color.LightCyan;
    private Color bgcolor_Dot  = Color.PowderBlue;
    private Color bgcolor_Op   = Color.Lavender;
    private Color bgcolor_Eq   = Color.LavenderBlush;
    private Color bgcolor_Func = Color.LemonChiffon;
    private Color bgcolor_Memo = Color.LightPink;
    private Color bgcolor_Cls  = Color.HotPink;
    // KEY size
    private Size key_Size  = new Size(50, 30);
    private Size key_Size2 = new Size(50, 60);
    // layout
    private int[] row = {10, 60, 90, 120, 150, 180};
    private int[] col = {10, 60, 110, 160, 210};
    // for dentaku calculation
    private bool    entry_started   = false;
    private bool    entry_dot       = false;
    private decimal entry_result    = 0;
    private decimal entry_memory    = 0;
    private string  entry_operation = null;
    /////////////////////////////////////////////////////////////////////////////
    // Dentaku constructor
    public Dentaku()
    {
      this.Width  = 280;
      this.Height = 250;
      this.Text = "電卓";
      this.FormBorderStyle
        = System.Windows.Forms.FormBorderStyle.FixedDialog;
      // DISPLAY
      this.lab_0 = new Label();
      this.lab_0.Font = new Font("MS UI Gothic", 14);
      this.lab_0.BackColor = bgcolor_Disp;
      this.lab_0.BorderStyle = BorderStyle.FixedSingle;
      this.lab_0.Location = new Point(col[0], row[0]);
      this.lab_0.Name = "lab0";
      this.lab_0.Size = new Size(250, 40);
      this.lab_0.Padding = new Padding(5);
      this.lab_0.Text = "0";
      this.lab_0.TextAlign = ContentAlignment.MiddleRight;
      this.Controls.Add(this.lab_0);
      // KEY √
      this.but_root = new Button();
      this.but_root.BackColor = bgcolor_Func;
      this.but_root.Location = new Point(col[0], row[1]);
      this.but_root.Size = key_Size;
      this.but_root.Text = "√";
      this.but_root.Click += new EventHandler(but_func_Click);
      this.Controls.Add(this.but_root);
      // KEY MRC
      this.but_mrc = new Button();
      this.but_mrc.BackColor = bgcolor_Memo;
      this.but_mrc.Location = new Point(col[1], row[1]);
      this.but_mrc.Size = key_Size;
      this.but_mrc.Text = "MRC";
      this.but_mrc.Click += new EventHandler(but_memo_Click);
      this.Controls.Add(this.but_mrc);
      // KEY M-
      this.but_mminus = new Button();
      this.but_mminus.BackColor = bgcolor_Memo;
      this.but_mminus.Location = new Point(col[2], row[1]);
      this.but_mminus.Size = key_Size;
      this.but_mminus.Text = "M-";
      this.but_mminus.Click += new EventHandler(but_memo_Click);
      this.Controls.Add(but_mminus);
      // KEY M+
      this.but_mplus = new Button();
      this.but_mplus.BackColor = bgcolor_Memo;
      this.but_mplus.Location = new Point(col[3], row[1]);
      this.but_mplus.Size = key_Size;
      this.but_mplus.Text = "M+";
      this.but_mplus.Click += new EventHandler(but_memo_Click);
      this.Controls.Add(this.but_mplus);
      // KEY ÷
      this.but_div = new Button();
      this.but_div.BackColor = bgcolor_Op;
      this.but_div.Location = new Point(col[4], row[1]);
      this.but_div.Size = key_Size;
      this.but_div.Text = "÷";
      this.but_div.Click += new EventHandler(but_ope_Click);
      this.Controls.Add(this.but_div);
      // KEY ％
      this.but_percent = new Button();
      this.but_percent.BackColor = bgcolor_Func;
      this.but_percent.Location = new Point(col[0], row[2]);
      this.but_percent.Size = key_Size;
      this.but_percent.Text = "％";
      this.but_percent.Click += new EventHandler(this.but_func_Click);
      this.Controls.Add(this.but_percent);
      // KEY ７
      this.but_7 = new Button();
      this.but_7.BackColor = bgcolor_Num;
      this.but_7.Location = new Point(col[1], row[2]);
      this.but_7.Size = key_Size;
      this.but_7.Text = "７";
      this.but_7.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_7);
      // KEY ８
      this.but_8 = new Button();
      this.but_8.BackColor = bgcolor_Num;
      this.but_8.Location = new Point(col[2], row[2]);
      this.but_8.Size = key_Size;
      this.but_8.Text = "８";
      this.but_8.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_8);
      // KEY ９
      this.but_9 = new Button();
      this.but_9.BackColor = bgcolor_Num;
      this.but_9.Location = new Point(col[3], row[2]);
      this.but_9.Size = key_Size;
      this.but_9.Text = "９";
      this.but_9.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_9);
      // KEY ×
      this.but_mul = new Button();
      this.but_mul.BackColor = this.bgcolor_Op;
      this.but_mul.Location = new Point(this.col[4], this.row[2]);
      this.but_mul.Size = this.key_Size;
      this.but_mul.Text = "×";
      this.but_mul.Click += new EventHandler(this.but_ope_Click);
      this.Controls.Add(this.but_mul);
      // KEY ±
      this.but_sign = new Button();
      this.but_sign.BackColor = bgcolor_Func;
      this.but_sign.Location = new Point(col[0], row[3]);
      this.but_sign.Size = key_Size;
      this.but_sign.Text = "±";
      this.but_sign.Click += new EventHandler(but_func_Click);
      this.Controls.Add(this.but_sign);
      // KEY ４
      this.but_4 = new Button();
      this.but_4.BackColor = bgcolor_Num;
      this.but_4.Location = new Point(col[1], row[3]);
      this.but_4.Size = key_Size;
      this.but_4.Text = "４";
      this.but_4.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_4);
      // KEY ５
      this.but_5 = new Button();
      this.but_5.BackColor = bgcolor_Num;
      this.but_5.Location = new Point(col[2], row[3]);
      this.but_5.Size = key_Size;
      this.but_5.Text = "５";
      this.but_5.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_5);
      // KEY ６
      this.but_6 = new Button();
      this.but_6.BackColor = bgcolor_Num;
      this.but_6.Location = new Point(col[3], row[3]);
      this.but_6.Size = key_Size;
      this.but_6.Text = "６";
      this.but_6.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_6);
      // KEY −
      this.but_minus = new Button();
      this.but_minus.BackColor = bgcolor_Op;
      this.but_minus.Location = new Point(col[4], row[3]);
      this.but_minus.Size = key_Size;
      this.but_minus.Text = "−";
      this.but_minus.Click += new EventHandler(but_ope_Click);
      this.Controls.Add(this.but_minus);
      // KEY C
      this.but_clear = new Button();
      this.but_clear.BackColor = bgcolor_Cls;
      this.but_clear.Location = new Point(col[0], row[4]);
      this.but_clear.Size = key_Size;
      this.but_clear.Text = "C";
      this.but_clear.Click += new EventHandler(but_clear_Click);
      this.Controls.Add(this.but_clear);
      // KEY １
      this.but_1 = new Button();
      this.but_1.BackColor = bgcolor_Num;
      this.but_1.Location = new Point(col[1], row[4]);
      this.but_1.Size = key_Size;
      this.but_1.Text = "１";
      this.but_1.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_1);
      // KEY ２
      this.but_2 = new Button();
      this.but_2.BackColor = bgcolor_Num;
      this.but_2.Location = new Point(col[2], row[4]);
      this.but_2.Size = key_Size;
      this.but_2.Text = "２";
      this.but_2.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_2);
      // KEY ３
      this.but_3 = new Button();
      this.but_3.BackColor = bgcolor_Num;
      this.but_3.Location = new Point(col[3], row[4]);
      this.but_3.Size = key_Size;
      this.but_3.Text = "３";
      this.but_3.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_3);
      // KEY ＋
      this.but_plus = new Button();
      this.but_plus.BackColor = bgcolor_Op;
      this.but_plus.Location = new Point(col[4], row[4]);
      this.but_plus.Size = key_Size2;
      this.but_plus.Text = "＋";
      this.but_plus.Click += new EventHandler(but_ope_Click);
      this.Controls.Add(this.but_plus);
      // KEY ０
      this.but_0 = new Button();
      this.but_0.BackColor = bgcolor_Num;
      this.but_0.Location = new Point(col[0], row[5]);
      this.but_0.Size = key_Size;
      this.but_0.Text = "０";
      this.but_0.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_0);
      // KEY ００
      this.but_00 = new Button();
      this.but_00.BackColor = bgcolor_Num;
      this.but_00.Location = new Point(col[1], row[5]);
      this.but_00.Size = key_Size;
      this.but_00.Text = "００";
      this.but_00.Click += new EventHandler(but_num_Click);
      this.Controls.Add(this.but_00);
      // KEY ・
      this.but_dot = new Button();
      this.but_dot.BackColor = bgcolor_Dot;
      this.but_dot.Location = new Point(col[2], row[5]);
      this.but_dot.Size = key_Size;
      this.but_dot.Text = "・";
      this.but_dot.Click += new EventHandler(but_dot_Click);
      this.Controls.Add(this.but_dot);
      // KEY ＝
      this.but_equal = new Button();
      this.but_equal.BackColor = bgcolor_Eq;
      this.but_equal.Location = new Point(col[3], row[5]);
      this.but_equal.Size = key_Size;
      this.but_equal.Text = "＝";
      this.but_equal.Click += new EventHandler(but_equal_Click);
      this.Controls.Add(this.but_equal);
    }
    ///////////////////////////////////////////////////////////////////////////
    // but_num_Click - NUMBER key enter
    private void but_num_Click(object sender, EventArgs e)
    {
      Button but = (Button)sender;
      string n = "0";
      switch (but.Text)
      {
        case "０" :   n = "0";  break;
        case "００" : n = "00"; break;
        case "１" :   n = "1";  break;
        case "２" :   n = "2";  break;
        case "３" :   n = "3";  break;
        case "４" :   n = "4";  break;
        case "５" :   n = "5";  break;
        case "６" :   n = "6";  break;
        case "７" :   n = "7";  break;
        case "８" :   n = "8";  break;
        case "９" :   n = "9";  break;
      }
      if (entry_started == false)
      {
        lab_0.Text = "0";
      }
      if (lab_0.Text == "0")
      {
        if (n != "00")
        {
          lab_0.Text = n;
        }
      }
      else
      {
        lab_0.Text = lab_0.Text + n;
      }
      entry_started = true;
    }
    ///////////////////////////////////////////////////////////////////////////
    // but_dot_Click - DOT key enter
    private void but_dot_Click(object sender, EventArgs e)
    {
      if (entry_dot == false)
      {
        if (entry_started == false)
        { 
         lab_0.Text = "0.";
        }
        else
        {
          lab_0.Text = lab_0.Text + ".";
        }
        entry_started = true;
        entry_dot     = true;
      } 
    }
    ///////////////////////////////////////////////////////////////////////////
    // but_func_Click - Function key enter
    private void but_func_Click(object sender, EventArgs e)
    {
      decimal n;
      Button but = (Button)sender;
      switch (but.Text)
      {
        case "±" :
          n = decimal.Parse(lab_0.Text) * -1;
          lab_0.Text = n.ToString();
          break;
        case "％" :
          n = (decimal)(double.Parse(lab_0.Text) / 100);
          lab_0.Text = n.ToString();
          break;
        case "√" :
          try
          {
            n = (decimal)Math.Sqrt((double)decimal.Parse(lab_0.Text));
            lab_0.Text = n.ToString();
          }
          catch
          {
            lab_0.Text = "E";
          }
          break;
      }
      entry_started = false;
      entry_dot     = false;
    }
    ///////////////////////////////////////////////////////////////////////////
    // but_ope_Click - OPERATION key enter
    private void but_ope_Click(object sender, EventArgs e)
    {
      Button but = (Button)sender;
      if (entry_operation != null)
      {
        but_equal_calculation();
      }
      entry_operation = but.Text;
      entry_result    = decimal.Parse(lab_0.Text);
      entry_started   = false;
      entry_dot       = false;
    }
    ///////////////////////////////////////////////////////////////////////////
    // but_equal_Click - EQUAL key enter
    private void but_equal_Click(object sender, EventArgs e)
    {
      if (entry_operation != null)
      {
        but_equal_calculation();
      }
      entry_started = false;
      entry_dot     = false;
    }
    ///////////////////////////////////////////////////////////////////////////
    // but_equal_calculation - sub for EQUAL key enter
    private void but_equal_calculation()
    {
      decimal n = 0;
      switch (entry_operation)
      {
        case "＋" :
          n = entry_result + decimal.Parse(lab_0.Text);
          lab_0.Text = n.ToString();
          break;
        case "−" :
          n = entry_result - decimal.Parse(lab_0.Text);
          lab_0.Text = n.ToString();
          break;
        case "×" :
          n = entry_result * decimal.Parse(lab_0.Text);
          lab_0.Text = n.ToString();
          break;
        case "÷" :
          try
          {
            n = entry_result / decimal.Parse(lab_0.Text);
            lab_0.Text = n.ToString();
          }
          catch
          {
            lab_0.Text = "E";
          }
          break;
      }
      entry_operation = null;
    }
    ///////////////////////////////////////////////////////////////////////////
    // but_clear_Click - CLEAR key enter
    private void but_clear_Click(object sender, EventArgs e)
    {
      lab_0.Text      = "0";
      entry_started   = false;
      entry_dot       = false;
      entry_result    = 0;
      entry_operation = null;
    }
    ///////////////////////////////////////////////////////////////////////////
    // but_memo_Click - MEMORY key enter
    private void but_memo_Click(object sender, EventArgs e)
    {
      Button but = (Button)sender;
      switch (but.Text)
      {
        case "M+" :
          entry_memory = entry_memory + decimal.Parse(lab_0.Text);
          break;
        case "M-" :
          entry_memory = entry_memory - decimal.Parse(lab_0.Text);
          break;
        case "MRC" :
          lab_0.Text   = entry_memory.ToString();
          entry_memory = 0;
          break;
      }
      entry_started = false;
      entry_dot     = false;
    }
  }
}
// END PROGRAM

電卓の機能についてはデバッグが不十分です、ご了承ください。
Fedora 上でのビルド、および実行は次のようにします。

$ gmcs -pkg:dotnet -target:winexe dentaku.cs
$ mono dentaku.exe &

Windows XP へ dentaku.exe をコピーして、（ダブルクリックして）実行した結果を以下に示しました。