SecureInputBoxDialog.cs

/*
  RMLibUI: Visual support classes/components used by multiple R&M Software programs
  Copyright (C) 2008-2014  Rick Parrish, R&M Software

  This file is part of RMLibUI.

  RMLibUI is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  any later version.

  RMLibUI is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with RMLibUI.  If not, see <http://www.gnu.org/licenses/>.
*/
using System;
using System.Windows.Forms;
using RandM.RMLib;

namespace RandM.RMLibUI
{
    public class frmRMSecureInputBox : Form
    {
        #region Windows Contols and Constructor

        private System.Windows.Forms.Label lblPrompt;
        private System.Windows.Forms.Button cmdOK;
        private RandM.RMLibUI.SecureTextBox txtInput;
        private CheckBox chkShowPassword;
        /// <summary>
        /// Required designer variable.
        ///</summary>
        private System.ComponentModel.Container components = null;

        #endregion

        #region Dispose

        /// <summary>
        /// Clean up any resources being used.
        ///</summary>
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                    _SecureText.Dispose();
                }
            }
            base.Dispose(disposing);
        }

        #endregion

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        ///</summary>
        private void InitializeComponent()
        {
            this.lblPrompt = new System.Windows.Forms.Label();
            this.cmdOK = new System.Windows.Forms.Button();
            this.cmdCancel = new System.Windows.Forms.Button();
            this.txtInput = new RandM.RMLibUI.SecureTextBox();
            this.chkShowPassword = new System.Windows.Forms.CheckBox();
            this.SuspendLayout();
            // 
            // lblPrompt
            // 
            this.lblPrompt.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
            | System.Windows.Forms.AnchorStyles.Left) 
            | System.Windows.Forms.AnchorStyles.Right)));
            this.lblPrompt.BackColor = System.Drawing.SystemColors.Control;
            this.lblPrompt.Font = new System.Drawing.Font("Microsoft Sans Serif", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.lblPrompt.Location = new System.Drawing.Point(12, 9);
            this.lblPrompt.Name = "lblPrompt";
            this.lblPrompt.Size = new System.Drawing.Size(295, 111);
            this.lblPrompt.TabIndex = 99;
            // 
            // cmdOK
            // 
            this.cmdOK.DialogResult = System.Windows.Forms.DialogResult.OK;
            this.cmdOK.Location = new System.Drawing.Point(312, 5);
            this.cmdOK.Name = "cmdOK";
            this.cmdOK.Size = new System.Drawing.Size(75, 25);
            this.cmdOK.TabIndex = 1;
            this.cmdOK.Text = "&OK";
            this.cmdOK.UseVisualStyleBackColor = true;
            this.cmdOK.Click += new System.EventHandler(this.cmdOK_Click);
            // 
            // cmdCancel
            // 
            this.cmdCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
            this.cmdCancel.Location = new System.Drawing.Point(312, 36);
            this.cmdCancel.Name = "cmdCancel";
            this.cmdCancel.Size = new System.Drawing.Size(75, 25);
            this.cmdCancel.TabIndex = 2;
            this.cmdCancel.Text = "&Cancel";
            this.cmdCancel.UseVisualStyleBackColor = true;
            // 
            // txtInput
            // 
            this.txtInput.Location = new System.Drawing.Point(8, 95);
            this.txtInput.Name = "txtInput";
            this.txtInput.Size = new System.Drawing.Size(379, 20);
            this.txtInput.TabIndex = 0;
            this.txtInput.UseSystemPasswordChar = true;
            // 
            // chkShowPassword
            // 
            this.chkShowPassword.AutoSize = true;
            this.chkShowPassword.Location = new System.Drawing.Point(8, 121);
            this.chkShowPassword.Name = "chkShowPassword";
            this.chkShowPassword.Size = new System.Drawing.Size(101, 17);
            this.chkShowPassword.TabIndex = 100;
            this.chkShowPassword.Text = "Show password";
            this.chkShowPassword.UseVisualStyleBackColor = true;
            this.chkShowPassword.CheckedChanged += new System.EventHandler(this.chkShowPassword_CheckedChanged);
            // 
            // frmRMSecureInputBox
            // 
            this.AcceptButton = this.cmdOK;
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.BackColor = System.Drawing.SystemColors.Control;
            this.CancelButton = this.cmdCancel;
            this.ClientSize = new System.Drawing.Size(394, 157);
            this.Controls.Add(this.chkShowPassword);
            this.Controls.Add(this.txtInput);
            this.Controls.Add(this.cmdCancel);
            this.Controls.Add(this.cmdOK);
            this.Controls.Add(this.lblPrompt);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.Name = "frmRMSecureInputBox";
            this.ShowInTaskbar = false;
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
            this.Text = "R&M Secure Input Box";
            this.Load += new System.EventHandler(this.frmRMSecureInputBox_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }
        private System.Windows.Forms.Button cmdCancel;
        #endregion

        public frmRMSecureInputBox(string prompt, string caption)
        {
            InitializeComponent();

            // Initialize dialog
            lblPrompt.Text = prompt;
            this.Text = caption;

            // Set default return value
            _SecureText.Clear();
        }

        private void cmdOK_Click(object sender, EventArgs e)
        {
            // Save new return value (we call GetSecureText() to get the value, and not the actual instance of the RMSecureString)
            _SecureText = txtInput.SecureText.GetSecureText();
        }

        private void frmRMSecureInputBox_Load(object sender, System.EventArgs e)
        {
            // Focus text box with all text highlighted
            txtInput.SelectAll();
            txtInput.Focus();
        }

        public RMSecureString SecureText
        {
            get { return _SecureText; }
        }
        private RMSecureString _SecureText = new RMSecureString();

        private void chkShowPassword_CheckedChanged(object sender, EventArgs e)
        {
            if (chkShowPassword.Checked)
            {
                txtInput.PasswordChar = '\0';
                txtInput.UseSystemPasswordChar = false;
            }
            else
            {
                txtInput.PasswordChar = '*';
                txtInput.UseSystemPasswordChar = true;
            }
        }
    }
}