GreatHomeChildcare-2/frmPinEntry.cs
2021-02-02 21:12:18 -08:00

164 lines
5.9 KiB
C#

using System;
using System.Windows.Forms;
using GreatHomeChildcare.Models;
//Refs
// https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.form.shown?redirectedfrom=MSDN&view=net-5.0
namespace GreatHomeChildcare
{
public partial class frmPinEntry : Form
{
//Global instance of the SqliteDataAccess object.
SqliteDataAccess SqliteDataAccess = new SqliteDataAccess();
public static string strPin = String.Empty;
public frmPinEntry()
{
InitializeComponent();
}
/* Event delegate to handle all the numerical buttons on the page.
* INPUT object sender, eventargs e
* OUTPUT: Stores pin in hidden variable strPin, while displaying * in the text box.
*/
private void btnNumButton_Click(object sender, EventArgs e)
{
//Don't allow a PIN length longer than 4 digits.
if (strPin.Length >= 4)
return;
//to the passed in sender source and cast it to a Button
Button button = (Button)sender;
strPin += button.Text;
tbPinNumber.Text += button.Text;
if (strPin.Length == 4)
btnLogin.Enabled = true;
}
//Prevents typing in the pin number box.
private void tbPinNumber_KeyPress(object sender, KeyPressEventArgs e)
{
//Don't allow typing in the control.
e.Handled = true;
}
/*Clears the pin entry completely,
* resetting the hidden variable strPin,
* clearing the text box,
* and disabling the login button.
*/
private void btnCE_Click(object sender, EventArgs e)
{
strPin = String.Empty;
tbPinNumber.Text = String.Empty;
btnLogin.Enabled = false;
}
// Deletes the last number entered into the pinpad.
private void btnBack_Click(object sender, EventArgs e)
{
//If there is nothing in the display, do not attempt
//to remove any digits, or the program will crash.
if (strPin.Length == 0)
return;
//Assign the text in the display using a substring
//of whatever the text is, subtracting the length by 1.
//This effectively 'strips' the last digit from the display string.
tbPinNumber.Text = tbPinNumber.Text.Substring(0, tbPinNumber.Text.Length - 1);
strPin = strPin.Substring(0, strPin.Length - 1);
//disable login button
btnLogin.Enabled = false;
}
/* Implements login functionality. If the pin # is valid (present in Guardian table)
* then it will instantiate a new object of Form2, and attach a form closed delegate to it.
* Then, the program shows the new form. strPin is public global so the new form can grab it.
* The program will then hide the pinpad form and clear the entry/pin value from memory.
*/
private void btnLogin_Click(object sender, EventArgs e)
{
Form frm2 = new frmMainForm();
frm2.FormClosed += new FormClosedEventHandler(MainFormClosed);
if(IsValidLogin(strPin))
{
frm2.Show();
Hide();
btnCE_Click(this, EventArgs.Empty);
}
}
/* valid login check to see if pin# exists in the db.
* INPUT integer pin number
* OUTPUT boolean true/false
*/
private bool IsValidLogin(string pin_in)
{
return true;
//TODO: Remove above return statement and implement after code testing.
//Could possibly move guardian to global and pass guardian to frmMainForm.
Guardian guardian = new Guardian();
guardian = SqliteDataAccess.GetGuardianByPin(Int32.Parse(pin_in));
if(guardian == null)
{
MessageBox.Show("Sorry, that is an invalid login.", "Great Home Childcare", MessageBoxButtons.OK, MessageBoxIcon.None);
return false;
}
return true;
}
//Show the pin login screen after the main student login/out form is closed.
private void MainFormClosed(object sender, FormClosedEventArgs e)
{
Show();
}
/* Checks to see if this is the first-ever time the application has
* run by querying number of rows in Guardian table.
* If number of rows <= 0, we must setup an admin user in the guardian table.
* The Shown event is only raised the first time a form is displayed; subsequently
* minimizing, maximizing, restoring, hiding, showing, or invalidating and repainting
* will not raise this event. Ref: Microsoft
*/
private void frmPinEntry_Shown(object sender, EventArgs e)
{
Hide();
int num_admins = 0;
DialogResult dr;
num_admins = SqliteDataAccess.GetNumAdmins();
if (num_admins <= 0)
{
dr = MessageBox.Show("Program not setup yet. Setup now?", "Great Home Childcare", MessageBoxButtons.YesNo, MessageBoxIcon.None);
// Open the form to add a new guardian.
if (dr == DialogResult.Yes)
{
Form frm2 = new frmGuardianCrud();
frm2.FormClosed += new FormClosedEventHandler(MainFormClosed);
frm2.Show();
Hide();
}
else //Show a message and close the application.
{
MessageBox.Show("Come back when you are ready to setup the program!", "Great Home Childcare", MessageBoxButtons.OK, MessageBoxIcon.None);
Close();
}
}
else
{
Show();
}
}
}
}