McBitFont/McBitFont/CodeShift.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace McBitFont {
    public partial class CodeShift : Form {

        private int maxLeft, maxRight, maxSC, count;
        public int sc;

        public CodeShift(MainForm parent) {
            InitializeComponent();

            count = parent.frames.Count;
            sc = parent.frames.First().code;
            maxLeft = sc;
            maxRight = 255 - sc - count + 1;
            maxSC = sc + maxRight;
        }

        private void CodeShift_Load(object sender, EventArgs e) {
            byte enabled = 7;
            string msg = "";
            if (maxLeft < 1) {
                rbShiftLeft.Enabled = false;
                enabled -= 1;
                msg += "Cannot shift left: Start code is " + sc.ToString() + ".";
            }
            if (maxRight < 1) {
                rbShiftRight.Enabled = false;
                enabled -= 2;
                msg += "\nCannot shift right: Last code is " + (sc + count - 1).ToString() + ".";
            }
            if (maxSC <= 0) {
                rbSpecify.Enabled = false;
                enabled -= 4;
                msg += "\nCannot shift: The font is full." + (sc + count - 1).ToString();
            }
            lblMessage.Text = msg;

            if ((enabled & 1) > 0) rbShiftLeft.Checked = true;
            else if ((enabled & 2) > 0) rbShiftRight.Checked = true;
            else if ((enabled & 4) > 0) rbSpecify.Checked = true;
            else {
                btnOK.Enabled = false;
                nudValue.Enabled = false;
            }


            //ModeChanged(rbShiftLeft, null);
            //nudValue.Minimum = 1;
            //nudValue.Maximum = maxLeft;
        }

        private void ModeChanged(object sender, EventArgs e) {
            if (rbSpecify.Checked) {
                lblValue.Text = "New start code:";
                nudValue.Minimum = 0;
                nudValue.Maximum = maxSC;
                nudValue.Value = 0;
                lblRange.Text = "min: 0\nmax: " + maxSC.ToString();
            } else {
                lblValue.Text = "Shift by:";
                nudValue.Minimum = 1;
                nudValue.Value = 1;
                if (rbShiftLeft.Checked) {
                    nudValue.Maximum = maxLeft;
                    lblRange.Text = "min: 1\nmax: " + maxLeft.ToString();
                }
                if (rbShiftRight.Checked) {
                    nudValue.Maximum = maxRight;
                    lblRange.Text = "min: 1\nmax: " + maxRight.ToString();
                }
            }

        }

        private void nudValue_ValueChanged(object sender, EventArgs e) {
            if (rbSpecify.Checked) {
                if (nudValue.Value == sc) btnOK.Enabled = false;
                else btnOK.Enabled = true;
            }
        }

        private void btnOK_Click(object sender, EventArgs e) {
            DialogResult = DialogResult.OK;
        }

        private void btnCancel_Click(object sender, EventArgs e) {
            DialogResult = DialogResult.Cancel;
        }
    }
}