PDFPatcher/App/Functions/ExtractImageControl.cs

using System;
using System.ComponentModel;
using System.IO;
using System.Windows.Forms;
using PDFPatcher.Common;

namespace PDFPatcher.Functions
{
	[ToolboxItem(false)]
	public partial class ExtractImageControl : FunctionControl, IResettableControl
	{
		public override string FunctionName => "提取图片";

		public override System.Drawing.Bitmap IconImage => Properties.Resources.ExtractImage;

		public ExtractImageControl() {
			InitializeComponent();
			this.OnFirstLoad(OnLoad);
		}

		void OnLoad() {
			_SourceFileControl.BrowseSelectedFiles += (object sender, EventArgs e) => {
				if (_AutoOutputDirBox.Checked == false) {
					return;
				}
				var sourceFile = _SourceFileControl.FirstFile;
				if (sourceFile.Length > 0) {
					_TargetBox.Text = FileHelper.CombinePath(Path.GetDirectoryName(sourceFile), Path.GetFileNameWithoutExtension(sourceFile));
				}
			};
			_AutoOutputDirBox.CheckedChanged += (object sender, EventArgs e) => { AppContext.ImageExtracter.AutoOutputFolder = _AutoOutputDirBox.Checked; };
			ShowFileMaskPreview();
			AppContext.MainForm.SetTooltip(_SourceFileControl.FileList, "包含图片的 PDF 文件路径");
			AppContext.MainForm.SetTooltip(_TargetBox, "放置输出图片的文件夹路径");
			AppContext.MainForm.SetTooltip(_ExtractPageRangeBox, "在此指定需提取图片的页码范围，不指定页码范围时提取所有页面的图片");
			AppContext.MainForm.SetTooltip(_FileNameMaskBox, "提取的图片文件名按其所在页码数字命名，可在此修改命名规则\n“0000”：不足四位用0补足四位\n“0”：文件名按实际页码，不用0补位\n可用英文双引号将文本括起来（如“\"相约2000\"0”，前面的“2000”不会被解释为占位符）");
			AppContext.MainForm.SetTooltip(_MergeImageBox, "尝试将相同页面下的图片合并为同一个文件\n①合并图片的格式必须相同\n②宽度必须相同\n③仅限 PNG 和 TIFF 格式");
			AppContext.MainForm.SetTooltip(_VerticalFlipImageBox, "某些 PDF 文件导出的图片上下颠倒，可用此选项将其还原");
			AppContext.MainForm.SetTooltip(_InvertBlackAndWhiteBox, "翻转 PNG 和 TIFF 黑白图片的颜色");
			AppContext.MainForm.SetTooltip(_MinHeightBox, "忽略高度小于此处指定值的图片");
			AppContext.MainForm.SetTooltip(_MinWidthBox, "忽略宽度小于此处指定值的图片");
			AppContext.MainForm.SetTooltip(_MergeJpgToPngBox, "在合并图片时，将使用有损压缩的 JPEG 图片合并为无损压缩的 PNG 图片");
			AppContext.MainForm.SetTooltip(_ExtractButton, "点击此按钮，将 PDF 文件的图片提取到指定的目录");
			AppContext.MainForm.SetTooltip(_SkipRedundantImagesBox, "避免导出 PDF 内部引用值一致的图片");
			Reload();
		}

		public void Reset() {
			AppContext.ImageExtracter = new ImageExtracterOptions();
			Reload();
		}

		public void Reload() {
			var o = AppContext.ImageExtracter;
			_AutoOutputDirBox.Checked = o.AutoOutputFolder;
			_FileNameMaskBox.Text = o.FileMask;
			_InvertBlackAndWhiteBox.Checked = o.InvertBlackAndWhiteImages;
			_MonoTiffBox.Checked = !o.MonoPng;
			_MergeImageBox.Checked = o.MergeImages;
			_MergeJpgToPngBox.Checked = o.MergeJpgToPng;
			_ExportAnnotImagesBox.Checked = o.ExtractAnnotationImages;
			_MinHeightBox.SetValue(o.MinHeight);
			_MinWidthBox.SetValue(o.MinWidth);
			_VerticalFlipImageBox.Checked = o.VerticalFlipImages;
			_ExportSoftMaskBox.Checked = o.ExtractSoftMask;
			_InvertSoftMaskBox.Checked = o.InvertSoftMask;
			_MonoPngBox.Checked = o.MonoPng;
			_SkipRedundantImagesBox.Checked = o.SkipRedundantImages;
		}

		void _BrowseTargetPdfButton_Click(object sender, EventArgs e) {
			var sourceFile = _SourceFileControl.Text;
			if (_TargetBox.Text.Length > 0) {
				_SaveImageBox.SelectedPath = Path.GetDirectoryName(_TargetBox.Text);
			}
			else if (sourceFile.Length > 0) {
				_SaveImageBox.SelectedPath = Path.GetDirectoryName(sourceFile);
			}
			if (_SaveImageBox.ShowDialog() == DialogResult.OK) {
				_TargetBox.Text =
					_SaveImageBox.SelectedPath
					//+ (_SaveImageBox.SelectedPath.EndsWith ("\\") ? String.Empty : "\\")
					//+ Path.GetFileNameWithoutExtension (sourceFile)
					;
			}
		}

		void _ExtractButton_Click(object sender, EventArgs e) {
			if (File.Exists(_SourceFileControl.FirstFile) == false) {
				FormHelper.ErrorBox(Messages.SourceFileNotFound);
				return;
			}
			if (_TargetBox.Text.IsNullOrWhiteSpace()) {
				_BrowseTargetPdfButton_Click(_BrowseTargetPdfButton, e);
				if (_TargetBox.Text.IsNullOrWhiteSpace()) {
					return;
				}
			}

			AppContext.SourceFiles = _SourceFileControl.Files;
			if (_SourceFileControl.Files.Length == 1) {
				_SourceFileControl.FileList.AddHistoryItem();
				_TargetBox.AddHistoryItem();
			}

			AppContext.MainForm.ResetWorker();
			var worker = AppContext.MainForm.GetWorker();
			worker.DoWork += (dummy, arg) => {
				var a = arg.Argument as object[];
				var files = a[0] as string[];
				var options = a[1] as ImageExtracterOptions;
				options.OutputPath = new FilePath(options.OutputPath).Normalize();
				if (files.Length > 1) {
					var ep = options.OutputPath;
					Tracker.SetTotalProgressGoal(files.Length);
					foreach (var file in files) {
						options.OutputPath = new FilePath(ep).Combine(new FilePath(file).FileNameWithoutExtension).Normalize();
						Processor.Worker.ExtractImages(file, options);
						Tracker.IncrementTotalProgress();
						if (AppContext.Abort) {
							return;
						}
					}
				}
				else {
					Processor.Worker.ExtractImages(files[0], options);
				}
			};
			worker.RunWorkerCompleted += (dummy, arg) => { AppContext.ImageExtracter.OutputPath = _ExtractPageRangeBox.Text; };
			var option = AppContext.ImageExtracter;
			option.ExtractAnnotationImages = _ExportAnnotImagesBox.Checked;
			option.PageRange = _ExtractPageRangeBox.Text;
			option.OutputPath = _TargetBox.Text;
			option.FileMask = _FileNameMaskBox.Text;
			option.MergeImages = _MergeImageBox.Checked;
			option.MergeJpgToPng = _MergeJpgToPngBox.Checked;
			option.VerticalFlipImages = _VerticalFlipImageBox.Checked;
			option.InvertBlackAndWhiteImages = _InvertBlackAndWhiteBox.Checked;
			option.MonoPng = _MonoPngBox.Checked;
			option.MinHeight = (int)_MinHeightBox.Value;
			option.MinWidth = (int)_MinWidthBox.Value;
			option.ExtractSoftMask = _ExportSoftMaskBox.Checked;
			option.InvertSoftMask = _InvertSoftMaskBox.Checked;
			option.SkipRedundantImages = _SkipRedundantImagesBox.Checked;
			worker.RunWorkerAsync(
				new object[] {
				AppContext.SourceFiles, option
			});
		}

		#region IDefaultButtonControl 成员

		public override Button DefaultButton => _ExtractButton;

		#endregion

		void _FileNameMaskBox_TextChanged(object sender, EventArgs e) {
			ShowFileMaskPreview();
		}

		void ShowFileMaskPreview() {
			try {
				var previews = new string[7];
				var f = _FileNameMaskBox.Text;
				previews[0] = 1.ToString(f) + ".jpg";
				previews[1] = 2.ToString(f) + ".jpg";
				previews[2] = 3.ToString(f) + ".jpg ...";
				previews[3] = "\n" + 11.ToString(f) + ".jpg";
				previews[4] = 12.ToString(f) + ".jpg";
				previews[5] = 13.ToString(f) + ".jpg ...";
				previews[6] = 100.ToString(f) + ".jpg";
				_FileMaskPreviewBox.Text = String.Join(" ", previews);
			}
			catch (Exception) {
				_FileMaskPreviewBox.Text = "文件名掩码无效。";
			}
		}

		void Control_Show(object sender, EventArgs e) {
			if (Visible && AppContext.MainForm != null) {
				_TargetBox.Contents = AppContext.Recent.Folders;
			}
			//else if (this.Visible == false) {
			//    this._TargetBox.DataSource = null;
			//}
		}

	}
}