Stuff

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

namespace AnimationTime
{
    public partial class MainForm : Form
    {
        private const int MaxImagesPerRow = 4;
        private const int ImageFrameLeft = 12;
        private const int ImageFrameTop = 38;
        private const int FormHorizontalPadding = ImageFrameLeft + 12 + 10; // Internal padding, plus external
        private const int FormVerticalPadding = ImageFrameTop + 12 + 40; // Internal padding, plus external

        AnimatedPictureFrame CurrentFrame;

        public MainForm()
        {
            InitializeComponent();

            txtCurrentDir.Text = Application.StartupPath;

            // Create the frame
            CurrentFrame = new AnimatedPictureFrame();
            CurrentFrame.Top = ImageFrameTop;
            CurrentFrame.Left = ImageFrameLeft;
            this.Controls.Add(CurrentFrame);
        }

        private void btnBrowse_Click(object sender, EventArgs e)
        {
            string SelectedFolder = null;
            using (FolderBrowserDialog BrowseDiag = new FolderBrowserDialog())
            {
                // Set the proper start directory
                if (Directory.Exists(txtCurrentDir.Text))
                    BrowseDiag.SelectedPath = txtCurrentDir.Text;
                else
                    BrowseDiag.SelectedPath = Application.StartupPath;

                BrowseDiag.Description = "Select the folder containing your .png sprite files";
                BrowseDiag.ShowNewFolderButton = false;
                if (BrowseDiag.ShowDialog() == System.Windows.Forms.DialogResult.OK && Directory.Exists(BrowseDiag.SelectedPath))
                    SelectedFolder = BrowseDiag.SelectedPath;

            }

            if (SelectedFolder != null)
            {
                txtCurrentDir.Text = SelectedFolder;
                LoadImages(SelectedFolder);
            }
        }

        private void btnReload_Click(object sender, EventArgs e)
        {
            if (Directory.Exists(txtCurrentDir.Text))
                LoadImages(txtCurrentDir.Text);
                
        }

        private void LoadImages(string ImageDirectory)
        {
            // Clear out and dispose old resources
            CurrentFrame.Clear();

            // Load new resources
            List<AnimatedPicture> Images = new List<AnimatedPicture>();
            foreach (string file in Directory.GetFiles(ImageDirectory))
                if (file.ToLower().EndsWith(".png"))
                    Images.Add(new AnimatedPicture(file));

            if (Images.Count > 0)
            {
                // Assume all images are the same size, and find the required cell size to render
                int Rows = Images.Count / MaxImagesPerRow;
                if (Images.Count % MaxImagesPerRow > 0)
                    Rows++;

                int CellSize = Images[0].CellSize;

                // Add the images to the panel at their proper position
                int CurrentX = 0;
                int CurrentY = 0;
                foreach (AnimatedPicture image in Images)
                {
                    image.Left = CurrentX * CellSize;
                    image.Top = CurrentY * CellSize;

                    CurrentX++;
                    if (CurrentX >= MaxImagesPerRow)
                    {
                        // Move to the next row
                        CurrentX = 0;
                        CurrentY++;
                    }
                }

                // Set the frame height and width to fit the image
                CurrentFrame.Width = (CellSize * MaxImagesPerRow);
                CurrentFrame.Height = (CellSize * Rows);

                // Adjust the form height and width to fit the images
                this.Width = CurrentFrame.Width + FormHorizontalPadding;
                this.Height = CurrentFrame.Height + FormVerticalPadding;

                // Set the new images
                CurrentFrame.Set(Images);
            }
        }
    }
}