PDFPatcher/App/Functions/Editor/Parts/MousePositionInfoHandler.cs

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

namespace PDFPatcher.Functions.Editor.Parts;

/// <summary>
/// 在状态栏显示鼠标所在位置的页面坐标和文本。
/// </summary>
sealed class MousePositionInfoHandler
{
	readonly Label _Label;
	readonly ViewerControl _ViewerBox;

	public MousePositionInfoHandler(Label label, ViewerControl viewerBox) {
		_Label = label;
		_ViewerBox = viewerBox;
		viewerBox.MouseMove += HandleViewerBoxMouseMove;
	}

	void HandleViewerBoxMouseMove(object sender, MouseEventArgs e) {
		if (_ViewerBox.FirstPage == 0) {
			return;
		}
		var l = e.Location;
		var p = _ViewerBox.TransposeClientToPagePosition(l.X, l.Y);
		if (p.Page == 0) {
			return;
		}
		var ti = _ViewerBox.FindTextLines(p);
		var t = ti.ToString();
		_Label.Text = string.Concat("页面：",
			p.Page,
			"/",
			_ViewerBox.TotalPageCount.ToText(),
			"; 位置：",
			Math.Round(p.PageX, 2),
			" * ",
			Math.Round(p.PageY, 2),
			ti.Spans.HasContent() ? String.Concat("; 字体：", String.Join(";", ti.GetFontNames()), " ", ti.Spans[0].Size) : null,
			t != null ? "; 文本：" : null,
			t);
	}
}