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ViewModel.cs
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ViewModel.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Threading;
using SkiaSharp;
namespace ImageMerge
{
class ViewModel : INotifyPropertyChanged
{
public ViewModel()
{
}
#region properties
private List<SelectImageViewModel> _selectImageViewModels;
public List<SelectImageViewModel> SelectImageViewModels
{
get { return _selectImageViewModels; }
set
{
if (_selectImageViewModels != value)
{
_selectImageViewModels = value;
OnPropertyChanged("SelectImageViewModels");
OnPropertyChanged("SelectedImagePaths");
PreviewMergeResult();
}
}
}
public List<(string,string)> SelectedImagePaths => SelectImageViewModels
?.Where(vm => vm.IsSelected)
?.Select(vm => (vm.ImageName, vm.ImageShortName)).ToList()
?? null;
private string _folderPath;
public string FolderPath
{
get { return _folderPath; }
set { _folderPath = value; OnPropertyChanged("FolderPath"); }
}
public string OutputPath => $"{FolderPath ?? ""}\\Merged Images";
private int _concatNum;
public int ConcatNum
{
get { return _concatNum; }
set
{
if(value <= 1 || value > (_selectImageViewModels?.Count ?? int.MaxValue)) { return; }
_concatNum = value;
OnPropertyChanged("ConcatNum"); PreviewMergeResult();
}
}
private List<PreviewImageViewModel> _previewImageViewModels;
public List<PreviewImageViewModel> PreviewImageViewModels
{
get { return _previewImageViewModels; }
set { _previewImageViewModels = value; OnPropertyChanged("PreviewImageViewModels"); }
}
private int _progressValue;
public int ProgressValue
{
get { return _progressValue; }
set { _progressValue = value; OnPropertyChanged("ProgressValue"); OnPropertyChanged("IsFinished"); }
}
public bool IsFinished => _progressValue == (_previewImageViewModels?.Count ?? 0) && _progressValue != 0;
private bool _checkAll = true;
public bool CheckAll
{
get { return _checkAll; }
set {
if (_checkAll == value || SelectImageViewModels is null) return;
_checkAll = value;
//SelectImageViewModels.ForEach(vm => vm.SetIsSelectedWithoutNotify(value));
SelectImageViewModels.ForEach(vm => vm.IsSelected = value);
OnPropertyChanged("CheckAll");
OnPropertyChanged("SelectedImagePaths");
PreviewMergeResult();
}
}
private bool _mergeOrder = true;
public bool MergeOrder
{
get { return _mergeOrder; }
set
{
if (_mergeOrder == value) return;
_mergeOrder = value;
OnPropertyChanged("MergeOrder");
PreviewMergeResult();
}
}
private bool _mergeOrientation = true;
public bool MergeOrientation
{
get { return _mergeOrientation; }
set
{
if (_mergeOrientation == value) return;
_mergeOrientation = value;
OnPropertyChanged("MergeOrientation");
//PreviewMergeResult();
}
}
public bool InverseCheck
{
set
{
if(SelectImageViewModels is null) return;
SelectImageViewModels.ForEach(vm => vm.IsSelected = !vm.IsSelected);
OnPropertyChanged("SelectedImagePaths");
PreviewMergeResult();
}
}
private bool _isMergeLastToPrevious;
public bool IsMergeLastToPrevious
{
get { return _isMergeLastToPrevious; }
set
{
if (_isMergeLastToPrevious == value) return;
_isMergeLastToPrevious = value;
OnPropertyChanged("IsMergeLastToPrevious");
PreviewMergeResult();
}
}
public int ImageQuality { get; internal set; }
public int ResizeRatio { get; internal set; }
public string FormatStr { get; set; }
public SKEncodedImageFormat Format => FormatStr switch
{
"jpg" => SKEncodedImageFormat.Jpeg,
"bmp" => SKEncodedImageFormat.Bmp,
"png" => SKEncodedImageFormat.Png,
"webp" => SKEncodedImageFormat.Webp,
_ => SKEncodedImageFormat.Jpeg
};
#endregion
private Regex _getNumFromFilePath = new Regex(@"\d+", RegexOptions.RightToLeft);
internal void SetFilePaths(string folderPath = null)
{
//if (folderPath == FolderPath) return;
if (!string.IsNullOrWhiteSpace(folderPath)) { FolderPath = folderPath; }
if (string.IsNullOrWhiteSpace(FolderPath)) { return; }
try
{
var filePaths = System.IO.Directory.GetFiles(FolderPath);
var fileNames = filePaths.Select(path => path[(path.LastIndexOf('\\') + 1)..path.Length])
.Where(path => path.EndsWith("bmp", StringComparison.OrdinalIgnoreCase) ||
path.EndsWith("png", StringComparison.OrdinalIgnoreCase) ||
path.EndsWith("jpg", StringComparison.OrdinalIgnoreCase) ||
path.EndsWith("jpeg", StringComparison.OrdinalIgnoreCase));
//Sort Files
var orderedFileNames = new SortedDictionary<int, string> ();
var unorderedFileNames = new List<string>();
foreach (var s in fileNames)
{
var numStr = _getNumFromFilePath.Match(s).Value;
if (string.IsNullOrWhiteSpace(numStr))
{
unorderedFileNames.Add(s);
}
else
{
orderedFileNames[int.Parse(numStr)] = s;
}
}
SelectImageViewModels = orderedFileNames.Values
.Concat(unorderedFileNames)
.Select(str => new SelectImageViewModel() { ImageName = str })
.ToList();
ProgressValue = 0;
}
catch
{
MessageBox.Show("输入的文件夹路径无效");
}
}
internal bool PreviewMergeResult()
{
var selectedImagePaths = SelectedImagePaths;
if (selectedImagePaths is null) return false;
if (!MergeOrder) selectedImagePaths.Reverse();
int lastLegenth = selectedImagePaths.Count % ConcatNum;
var groupCount = selectedImagePaths.Count / ConcatNum;
if(lastLegenth != 0)
{
if (_isMergeLastToPrevious) { lastLegenth += _concatNum; }
else { groupCount++; }
}
else { lastLegenth = _concatNum; }
var previewVMs = new List<PreviewImageViewModel>(groupCount);
for (int i = 0; i < groupCount; i++)
{
var curGroupLength = (i < groupCount - 1) ? _concatNum : lastLegenth;
var currentGroupImagePaths = selectedImagePaths.GetRange(i*_concatNum, curGroupLength).ToList();
previewVMs.Add(new PreviewImageViewModel()
{
AllImageNames = currentGroupImagePaths.Aggregate(new StringBuilder(), (sb, t)=>sb.AppendLine(t.Item2)).ToString(),
ImageNames = currentGroupImagePaths.Select(t => t.Item1).ToList(),
IsCreated = false
});
}
PreviewImageViewModels = previewVMs;
return true;
}
private void SaveImage(string savePath, SKImage mergedImage)
{
using SKData encoded = mergedImage.Encode(Format, ImageQuality);
using var outFile = File.OpenWrite(savePath);
encoded.SaveTo(outFile);
}
internal async Task MergeAndSaveImagesAsync(Dispatcher uiDispatcher)
{
if(_previewImageViewModels is null && !PreviewMergeResult())
{
return;
}
if (!Directory.Exists(OutputPath))
{
Directory.CreateDirectory(OutputPath);
}
if (string.IsNullOrWhiteSpace(FolderPath))
{
MessageBox.Show("请先打开一个文件夹");
}
var errorMsg = new StringBuilder();
await Task.Run(() =>
{
//每次循环处理一组图片
for (int i = 0; i < _previewImageViewModels.Count; i++)
{
//读取图片
var currentPreviewVM = _previewImageViewModels[i];
var mergingImages = currentPreviewVM.ImageNames
.Select(imgName =>
{
try
{
var path = $"{FolderPath}\\{imgName}";
using var file = new SKManagedStream(File.Open(path, FileMode.Open));
return SKBitmap.Decode(file);
}
catch(FileNotFoundException e)
{
errorMsg.AppendLine($"没有找到{ e.FileName}");
return null;
}
catch{ return null; }
})
.Where(image => image != null)
.ToList();
try
{
//开始拼接图片
var resizeRatio = ResizeRatio * 0.01;
var mergedHeight = 0;
var mergedWidth = 0;
var mergeDirectionLength = 0;
var targetWidth = 0;
if (_mergeOrientation)
{
mergedWidth = (int)Math.Round(mergingImages.First().Width * resizeRatio);
mergedHeight = (int)Math.Round(mergingImages.Aggregate(0, (accumHeight, image) => accumHeight + image.Height) * resizeRatio);
mergeDirectionLength = mergedHeight;
targetWidth = mergedWidth;
}
else
{
mergedWidth = (int)Math.Round(mergingImages.Aggregate(0, (accumWidth, image) => accumWidth + image.Width) * resizeRatio);
mergedHeight = (int)Math.Round(mergingImages.First().Height * resizeRatio);
mergeDirectionLength = mergedWidth;
targetWidth = mergedHeight;
}
using (var tempSurface = SKSurface.Create(new SKImageInfo(mergedWidth, mergedHeight)))
{
var canvas = tempSurface.Canvas;
//set background color
canvas.Clear(SKColors.Transparent);
//go through each image and draw it on the final image
int offsetX = 0;
int offsetY = 0;
foreach (var image in mergingImages)
{
var mergeDirectionStep = _mergeOrientation ? image.Height : image.Width;
var stackWidth = _mergeOrientation ? image.Width : image.Height;
if (stackWidth > targetWidth)
{
var resizeLength = (int)((float)mergeDirectionStep / stackWidth * targetWidth);
var resizeTargetSize = _mergeOrientation
? new SKImageInfo(targetWidth, resizeLength)
: new SKImageInfo(resizeLength, targetWidth);
using var resizedImage = image.Resize(resizeTargetSize, SKFilterQuality.High);
canvas.DrawBitmap(resizedImage, SKRect.Create(offsetX, offsetY, resizedImage.Width, resizedImage.Height));
if (_mergeOrientation) { offsetY += resizeLength; }
else { offsetX += resizeLength; }
}
else
{
canvas.DrawBitmap(image, SKRect.Create(offsetX, offsetY, image.Width, image.Height));
if (_mergeOrientation) { offsetY += image.Height; }
else { offsetX += image.Width; }
}
}
var mergedImage = tempSurface.Snapshot(_mergeOrientation
? SKRectI.Create(0, 0, mergedWidth, offsetY)
: SKRectI.Create(0, 0, offsetX, mergedHeight));
//保存图片
SaveImage($"{OutputPath}\\{i:D2}.{FormatStr}", mergedImage);
uiDispatcher.Invoke(() =>
{
currentPreviewVM.IsCreated = true;
ProgressValue = i + 1;
});
}
}
finally
{
//释放资源
foreach (var image in mergingImages)
{
image.Dispose();
}
}
}
}).ConfigureAwait(true);
//弹出错误框
var msg = errorMsg.ToString();
if (!string.IsNullOrWhiteSpace(msg))
{
MessageBox.Show(msg);
}
}
public void OnPropertyChanged(string name)=> PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
public event PropertyChangedEventHandler PropertyChanged;
}
}