using PdfiumViewer;
using System;
using System.Drawing;
using System.Windows.Forms;
namespace PDFViewer
{
public partial class Form1 : Form
{
PdfDocument _Document;
int _PageNum = 1;
int _PageW;
int _PageH;
public Form1()
{
InitializeComponent();
_Document = PdfDocument.Load(@"G:\Download\i.pdf");
var size = _Document.PageSizes[0];
_PageW = PointToPixel(size.Width);
_PageH = PointToPixel(size.Height);
HeaderEventAttach();
SideEventAttach();
RenderDocument();
int maxPage = _Document.PageCount - 1;
hScrollBar1.Maximum = maxPage + hScrollBar1.LargeChange - 1;
hScrollBar1.Scroll += (s, e) =>
{
_PageNum = e.NewValue;
RenderDocument();
};
}
private void SideEventAttach()
{
MemoText.KeyDown += (s, e) =>
{
if (e.KeyCode != Keys.Enter) return;
var sender = (TextBox)s;
if (sender.Text == "") return;
listBox1.ValueMember = "Page";
listBox1.DisplayMember = "Title";
listBox1.Items.Add(new {
Page = _PageNum.ToString(),
Title = sender.Text + "#" + _PageNum.ToString()
});
MemoText.Text = "";
};
listBox1.MouseDoubleClick += (s, e) =>
{
if (listBox1.IndexFromPoint(new Point(e.X, e.Y)) == -1) return;
if ((ModifierKeys & Keys.Control) == Keys.Control)
{
listBox1.Items.RemoveAt(listBox1.SelectedIndex);
}
else
{
dynamic items = listBox1.SelectedItem;
int.TryParse(items.Page, out int result);
_PageNum = result;
RenderDocument();
}
};
}
private void HeaderEventAttach()
{
NextButton.Click += (s, e) =>
{
if (_PageNum > _Document.PageCount - 1) return;
_PageNum++;
RenderDocument();
hScrollBar1.Value = _PageNum;
};
PrevButton.Click += (s, e) =>
{
if (_PageNum <= 0) return;
_PageNum--;
RenderDocument();
hScrollBar1.Value = _PageNum;
};
PageNumText.KeyDown += (s, e) =>
{
if (e.KeyCode == Keys.Enter)
{
var sender = (TextBox)s;
int.TryParse(sender.Text, out int result);
_PageNum = result;
RenderDocument();
}
if (e.KeyCode == Keys.Right)
{
NextButton.PerformClick();
RenderDocument();
}
if (e.KeyCode == Keys.Left)
{
PrevButton.PerformClick();
RenderDocument();
}
};
}
private void RenderDocument()
{
pictureBox1.Image = _Document.Render(_PageNum - 1, _PageW, _PageH, DeviceDpi, DeviceDpi, false);
PageNumText.Text = Convert.ToString(_PageNum);
}
private int PointToPixel(float point)
{
return (int)(DeviceDpi * point) / 72;
}
}
}