PDFPatcher/App/Functions/Editor/PagePropertyForm.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using BrightIdeasSoftware;
using MuPDF;
using PDFPatcher.Common;
using MuRectangle = MuPDF.Box;

namespace PDFPatcher.Functions.Editor;

sealed partial class PagePropertyForm : DraggableForm
{
	Document _document;

	public int PageNumber { get; set; }

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

	void OnLoad() {
		MinimumSize = Size;
		_MainTab.SelectedIndexChanged += UpdateOpPage;
		_PageDimensionBox.SelectedIndexChanged += _PageDimensionBox_SelectedIndexChanged;
		_CloseButton.Click += (s, args) => Hide();
		_FontNameColumn.AsTyped<MuFontAndSize>(f => f.AspectGetter = o => o.FontName);
		_SizeColumn.AsTyped<MuFontAndSize>(f => f.AspectGetter = o => o.Size);
		_TextStyleBox.ScaleColumnWidths();
	}

	void UpdateOpPage(object sender, EventArgs e) {
		if (_document != null && _MainTab.SelectedTab == _OpPage) {
			using (var p = new Processor.ContentParser.ContentProcessor(_document)) {
				ContentStreamViewer.SetContent(_OpBox, p, PageNumber);
			}
			_document = null;
			_MainTab.SelectedIndexChanged -= UpdateOpPage;
		}
	}

	public void LoadPage(Document pdfDocument, Page page) {
		_PageDimensionBox.Items.Clear();
		AddBox(page, page.CropBox, Constants.Content.PageSettings.CropBox);
		AddBox(page, page.MediaBox, Constants.Content.PageSettings.MediaBox);
		AddBox(page, page.TrimBox, Constants.Content.PageSettings.TrimBox);
		AddBox(page, page.ArtBox, Constants.Content.PageSettings.ArtBox);
		AddBox(page, page.BleedBox, Constants.Content.PageSettings.BleedBox);
		_RotationBox.Text = page.Rotation.ToString();
		if (_PageDimensionBox.Items.Count > 0) {
			_PageDimensionBox.SelectedIndex = 0;
		}
		var ts = new HashSet<MuFontAndSize>(new FontAndSizeComparer());
		foreach (var block in page.TextPage) {
			foreach (var line in block) {
				var c = line.FirstCharacter;
				ts.Add(new MuFontAndSize(Model.PdfDocumentFont.RemoveSubsetPrefix(c.Font.Name), c.Size));
			}
		}
		_TextStyleBox.Objects = ts;
		_TextStyleBox.Sort(_SizeColumn, SortOrder.Descending);
		PageNumber = page.PageNumber + 1;
		_document = pdfDocument;
	}

	void AddBox(Page page, MuRectangle rect, string title) {
		if (rect.IsValid && !rect.IsEmpty) {
			_PageDimensionBox.Items.Add(new Box(rect, title));
		}
	}

	void _PageDimensionBox_SelectedIndexChanged(object sender, EventArgs args) {
		if (_PageDimensionBox.SelectedItem is not Box v) {
			return;
		}
		var r = v.Rect;
		_TopBox.Text = r.Bottom.ToText();
		_RightBox.Text = r.Right.ToText();
		_BottomBox.Text = r.Top.ToText();
		_LeftBox.Text = r.Left.ToText();
		_WidthBox.Text = r.Width.ToText();
		_HeightBox.Text = r.Height.ToText();
	}

	protected override void OnDeactivate(EventArgs e) {
		Hide();
		base.OnDeactivate(e);
	}

	sealed class Box(MuRectangle rect, string title)
	{
		public readonly MuRectangle Rect = rect;
		public readonly string Title = title;

		public override string ToString() {
			return Title;
		}
	}

	sealed class MuFontAndSize(string fontName, float size)
	{
		public readonly string FontName = fontName;
		public readonly float Size = size;
	}

	sealed class FontAndSizeComparer : IEqualityComparer<MuFontAndSize>
	{
		public bool Equals(MuFontAndSize x, MuFontAndSize y) {
			return x.FontName == y.FontName && x.Size == y.Size;
		}

		public int GetHashCode(MuFontAndSize obj) {
			return obj.FontName.GetHashCode() ^ obj.Size.GetHashCode();
		}
	}
}