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Form1.cs
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Form1.cs
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//Pardon my procedural programming. :)
using System;
using System.IO;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using System.Threading;
namespace ClassAct
{
public partial class Form1 : Form
{
private const string settingsFileName = "ClassAct.config";
private const int undoLimit = 3;
private string src = "", settingsFile = "";
private string[] paths = new string[9];
private string shownFile = "", lastShownFile = "";
private bool allActionsTaken = false;
private List<string> fileEnumerator;
private List<Tuple<Image, string>> imageBuffer = new List<Tuple<Image, string>>();
private List<Tuple<string, string>> history = new List<Tuple<string, string>>();
private bool waitingForImage = false; //Set if the UI thread runs out of images but needs one; the image buffering thread deals with it then.
private Thread imageBufferThread;
private const string imageNotReadyText = " Loading the next image...";
private const string actionAlreadyTakenText = "Action already taken on the displayed image. Please wait for the next image to load.";
public Form1()
{
InitializeComponent();
}
public Form1(string directory)
{
//If a filename was specified and a directory with the same name doesn't exist, remove the file name
if (File.Exists(directory) && !Directory.Exists(directory)) directory = Path.GetDirectoryName(directory);
//Make sure the path is absolute
src = Path.GetFullPath(directory);
InitializeComponent();
}
private string pickFolder()
{
var dlg = folderBrowserDialog1.ShowDialog();
if (dlg == DialogResult.Cancel)
{
lblFeedback.Text = "Folder selection canceled";
return "";
}
else
{
return folderBrowserDialog1.SelectedPath;
}
}
private void Form1_Shown(object sender, EventArgs e)
{
if (src == "" || !Directory.Exists(src))
{
//Pick a source folder
src = pickFolder();
if (src == "")
{
Application.Exit();
return;
}
}
fileEnumerator = Directory.EnumerateFiles(src).ToList();
//Check for a saved settings file
settingsFile = Path.Combine(src, settingsFileName);
if (File.Exists(settingsFile))
{
var loadedPaths = File.ReadAllLines(settingsFile);
//Only load the saved paths that still exist
for (int x = 0; x < loadedPaths.Length && x < paths.Length; x++)
{
if (Directory.Exists(loadedPaths[x])) paths[x] = loadedPaths[x];
}
lblFeedback.Text = "Settings restored. Press F1 for help" + getRemainingFileCountStringToAppend();
}
else
{
lblFeedback.Text = "File list prepared. Press F1 for help" + getRemainingFileCountStringToAppend();
}
//Start off
nextFile();
//Start a second thread for loading images
imageBufferThread = new Thread(maintainImageBuffer);
imageBufferThread.Start();
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
preExit();
}
private bool takeImage()
{
if (pictureBox1.Image != null) pictureBox1.Image.Dispose();
lastShownFile = shownFile;
lock (imageBuffer) //Make sure the other thread isn't in the process of adding an image to the buffer
{
if (imageBuffer.Count != 0)
{
pictureBox1.Image = imageBuffer.First().Item1;
shownFile = imageBuffer.First().Item2;
imageBuffer.RemoveAt(0);
pictureBox1.Refresh();
Application.DoEvents();
allActionsTaken = false; //If we just loaded a new file, then the user obviously hasn't taken action on all the files yet
//Keep the user posted when the image finishes loading, if they were previously informed that the next image wasn't ready yet
if (lblFeedback.Text.EndsWith(imageNotReadyText)) lblFeedback.Text = lblFeedback.Text.Substring(0, lblFeedback.Text.Length - imageNotReadyText.Length);
else if (lblFeedback.Text == actionAlreadyTakenText) lblFeedback.Text = "Image loaded" + getRemainingFileCountStringToAppend();
return true; //Image was ready
}
if (fileEnumerator.Count == 0)
{
pictureBox1.Image = new Bitmap(10, 10);
lblFeedback.Text = "Reached last file";
allActionsTaken = true;
}
//If we didn't have an image ready to display, let the user know
if (imageBuffer.Count == 0) lblFeedback.Text += imageNotReadyText;
}
return false; //Image was not ready
}
private void nextFile()
{
//If there are no images ready, notify other thread that the UI thread has delegated responsibility to it for displaying an image
waitingForImage = !takeImage();
}
//Thread 2
private void maintainImageBuffer()
{
while (true)
{
if (imageBuffer.Count < 3) //Don't need to lock when only reading the Count; the other thread can only subtract from it.
{
do //Don't sleep until you have at least one image; otherwise, you could be sleeping 20ms between a bunch of non-image files, making the user wait unnecessarily.
{
var file = fileEnumerator.LastOrDefault();
if (string.IsNullOrEmpty(file))
{
return; //No more; don't loop forever
}
else
{
try
{
using (var fs = new FileStream(file, FileMode.Open))
{
//Don't load files over 50 MiB because they're probably not in a format we can load anyway.
if (fs.Length <= 50 * 1024 * 1024)
{
var newImage = new Bitmap(fs);
lock (imageBuffer) //Minimum possible lock time
{
imageBuffer.Add(new Tuple<Image, string>(newImage, file));
}
}
}
}
catch
{
//File is just skipped. Nothing to do.
}
fileEnumerator.RemoveAt(fileEnumerator.Count - 1);
}
} while (imageBuffer.Count < 1); //Don't sleep until you have at least one image
}
//If we didn't have an image shown already but we have one that we can show, show one
if (waitingForImage && imageBuffer.Count != 0)
{
//Use the UI thread
this.Invoke(new Action(() => {
waitingForImage = !takeImage();
}));
}
Thread.Sleep(20);
}
}
private string getRemainingFileCountStringToAppend()
{
return ". " + (imageBuffer.Count + fileEnumerator.Count) + " remaining files.";
}
private void undoPurge(bool all = false)
{
var target = (all ? 0 : undoLimit);
while (history.Count > target)
{
//Check if it was a tentative deletion. If so, finally delete the file as requested.
if (history.First().Item2 == null)
{
try
{
File.Delete(history.First().Item1);
}
catch { } //Tentatively no error reporting
}
//Remove the oldest entry from the history
history.RemoveAt(0);
}
}
private void moveWithUndo(string src, string dest)
{
try
{
File.Move(src, dest);
history.Add(new Tuple<string, string>(src, dest));
undoPurge();
lblFeedback.Text = "Moved" + getRemainingFileCountStringToAppend();
}
catch { }
}
private void deleteWithUndo(string src)
{
history.Add(new Tuple<string, string>(src, null));
undoPurge();
lblFeedback.Text = "Deleted" + getRemainingFileCountStringToAppend();
}
private void actualUndo()
{
if (history.Count == 0)
{
lblFeedback.Text = "Cannot undo any further" + getRemainingFileCountStringToAppend();
return; //Nothing to do if the history is empty
}
var toUndo = history.LastOrDefault();
//If it wasn't a delete action, undo the action for real
if (toUndo.Item2 != null)
{
try
{
File.Move(toUndo.Item2, toUndo.Item1);
}
catch { }
}
//Put the item back on the file list for the near future so the user can decide again
fileEnumerator.Add(toUndo.Item1);
//Remove the most recent undo item from the history
history.RemoveAt(history.Count - 1);
//If the user already picked an action for the final file, show the user this image again
if (imageBuffer.Count == 0 && allActionsTaken) nextFile();
lblFeedback.Text = "Undid " + (toUndo.Item2 == null ? "delete" : "move") + getRemainingFileCountStringToAppend();
}
private Tuple<Rectangle, Rectangle> calculateDualImageDisplayRectangles(Rectangle drawArea, Rectangle leftImage, Rectangle rightImage)
{
var midpoint = (float)(drawArea.Right - drawArea.Left) / 2;
var lScale = Math.Min((float)midpoint / leftImage.Width, (float)drawArea.Height / leftImage.Height);
var lw = leftImage.Width * lScale;
var lh = leftImage.Height * lScale;
var leftIsLimitedByHeight = Math.Abs(lh - drawArea.Height) < 1;
var rScale = Math.Min((float)(drawArea.Width - midpoint) / rightImage.Width, (float)drawArea.Height / rightImage.Height);
var rw = rightImage.Width * rScale;
var rh = rightImage.Height * rScale;
var rightIsLimitedByHeight = Math.Abs(rh - drawArea.Height) < 1;
//If either is limited by height, but not both, we can adjust the midpoint to grant extra width to the one that is limited by width
if (leftIsLimitedByHeight && !rightIsLimitedByHeight)
{
midpoint = lw;
//Recalculate the right (exact same 3 lines of code as before)
rScale = Math.Min((float)(drawArea.Width - midpoint) / rightImage.Width, (float)drawArea.Height / rightImage.Height);
rw = rightImage.Width * rScale;
rh = rightImage.Height * rScale;
}
else if (!leftIsLimitedByHeight && rightIsLimitedByHeight)
{
midpoint = drawArea.Width - rw;
//Recalculate the left (exact same 3 lines of code as before)
lScale = Math.Min((float)midpoint / leftImage.Width, (float)drawArea.Height / leftImage.Height);
lw = leftImage.Width * lScale;
lh = leftImage.Height * lScale;
}
return new Tuple<Rectangle, Rectangle>(new Rectangle(drawArea.Left + (int)(midpoint - lw) / 2, drawArea.Top + (int)(drawArea.Height - lh) / 2, (int)lw, (int)lh),
new Rectangle(drawArea.Left + (int)(drawArea.Width + midpoint - rw) / 2, drawArea.Top + (int)(drawArea.Height - rh) / 2, (int)rw, (int)rh));
}
/// <summary>
/// Move the currently shown file to the given path
/// </summary>
/// <param name="destination">Destination. If empty, allow user to pick.</param>
/// <returns>The same path as passed in, or if it was empty, the path the user picked (canceled = also empty)</returns>
private string moveAndAdvance(string destination)
{
if (String.IsNullOrEmpty(destination))
{
lblFeedback.Text = "Select a destination folder for this key.";
destination = pickFolder();
}
if (!String.IsNullOrEmpty(destination))
{
var destFilename = destination + Path.DirectorySeparatorChar + Path.GetFileName(shownFile);
var requestDelete = false;
//If both files exist, it interrupts the flow a bit, but ask the user what to do.
if (File.Exists(destFilename) && File.Exists(shownFile))
{
//Display both images for the user, side by side, so they can see if they're the same
var imageWas = pictureBox1.Image;
pictureBox1.Image = new Bitmap(pictureBox1.Width, pictureBox1.Height);
var g = Graphics.FromImage(pictureBox1.Image);
try
{
var otherImage = Image.FromFile(destFilename);
//Draw imageWas and otherImage side-by-side within pictureBox1.Image
var rects = calculateDualImageDisplayRectangles(pictureBox1.DisplayRectangle, new Rectangle(new Point(0, 0), imageWas.Size), new Rectangle(new Point(0, 0), otherImage.Size));
g.DrawImage(imageWas, rects.Item1);
g.DrawImage(otherImage, rects.Item2);
lblFeedback.Text = "Source image is shown on left; image with same name in destination is shown on right.";
}
catch
{
g.FillRectangle(new SolidBrush(Color.FromArgb(160, 0, 0, 0)), pictureBox1.DisplayRectangle);
g.DrawString("Destination file could not be loaded as an image", new Font(this.Font.FontFamily, 26), Brushes.White, pictureBox1.DisplayRectangle);
lblFeedback.Text = "Destination file could not be loaded as an image";
}
g.Dispose();
pictureBox1.Refresh();
Application.DoEvents();
var action = MessageBox.Show("Duplicate filename (" + Path.GetFileName(shownFile) + "). Delete this copy? Select No to keep both.", "ClassAct - Duplicate File", MessageBoxButtons.YesNoCancel);
if (action == DialogResult.Yes) requestDelete = true;
else if (action == DialogResult.No)
{
//Copy with different name
var extension = Path.GetExtension(destFilename);
var baseName = destFilename.Substring(0, destFilename.Length - extension.Length);
for (int x = 1; x < 1000 && File.Exists(destFilename); x++)
{
destFilename = baseName + " (" + x + ")" + extension;
}
}
else if (action == DialogResult.Cancel)
{
//Don't take the action requested.
lblFeedback.Text = "Action canceled" + getRemainingFileCountStringToAppend();
//Clean up the temporary image and reset the picture box to the old image so it can be disposed properly
pictureBox1.Image.Dispose();
pictureBox1.Image = imageWas;
return destination;
}
//Clean up the temporary image and reset the picture box to the old image so it can be disposed properly
pictureBox1.Image.Dispose();
pictureBox1.Image = imageWas;
}
nextFile();
try
{
if (requestDelete) deleteWithUndo(lastShownFile);
else
{
moveWithUndo(lastShownFile, destFilename);
}
}
catch
{
//No error reporting at this time.
}
}
return destination;
}
private void preExit()
{
lblFeedback.Text = "Purging undo history and saving destination directory settings...";
//Exit the image buffering thread
if (imageBufferThread != null) imageBufferThread.Abort();
//Purge the undo queue (tentatively deleted files will be actually deleted)
undoPurge(true);
if (String.IsNullOrEmpty(settingsFile)) return;
//Save the current setup
File.WriteAllLines(settingsFile, paths);
}
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
//If we're waiting for the next image to be loaded, don't let the user try to do something to the currently displayed image, because they already did something to it.
if (waitingForImage && e.KeyCode != Keys.Subtract && e.KeyCode != Keys.Escape && e.KeyCode != Keys.F1)
{
lblFeedback.Text = actionAlreadyTakenText;
return;
}
var index = -1;
if (e.KeyCode == Keys.NumPad1) index = 0;
else if (e.KeyCode == Keys.NumPad2) index = 1;
else if (e.KeyCode == Keys.NumPad3) index = 2;
else if (e.KeyCode == Keys.NumPad4) index = 3;
else if (e.KeyCode == Keys.NumPad5) index = 4;
else if (e.KeyCode == Keys.NumPad6) index = 5;
else if (e.KeyCode == Keys.NumPad7) index = 6;
else if (e.KeyCode == Keys.NumPad8) index = 7;
else if (e.KeyCode == Keys.NumPad9) index = 8;
else if (e.KeyCode == Keys.NumPad0)
{
//Delete
nextFile();
deleteWithUndo(lastShownFile);
}
else if (e.KeyCode == Keys.Enter)
{
//Skip (push to end of queue)
lblFeedback.Text = "File moved to end of queue" + getRemainingFileCountStringToAppend();
fileEnumerator.Insert(0, shownFile);
nextFile();
}
else if (e.KeyCode == Keys.Subtract)
{
//Undo
actualUndo();
}
else if (e.KeyCode == Keys.F1)
{
lblFeedback.Text = "Numpad 1 through 9: move to folder\r\nControl + numpad 1 through 9: select new folder to move to\r\nNumpad 0: delete\r\nEnter: skip file\r\nNumpad minus: undo move or delete (up to " + undoLimit + " times)\r\nEscape: quit";
}
else if (e.KeyCode == Keys.Escape)
{
preExit();
Application.Exit();
}
//If it was a number key
if (index != -1)
{
if (e.Modifiers.HasFlag(Keys.LControlKey) || e.Modifiers.HasFlag(Keys.RControlKey)) paths[index] = ""; //Control allows resetting the path
paths[index] = moveAndAdvance(paths[index]);
}
}
}
}