/// <inheritdoc/>
public void GetThumbnail(uint cx, out IntPtr phbmp, out WTS_ALPHATYPE pdwAlpha)
{
phbmp = IntPtr.Zero;
pdwAlpha = WTS_ALPHATYPE.WTSAT_UNKNOWN;
if (cx == 0 || cx > MaxThumbnailSize)
{
return;
}
using (var stream = new ReadonlyStream(this.Stream as IStream))
{
using (var memStream = new MemoryStream())
{
stream.CopyTo(memStream);
memStream.Position = 0;
using (Bitmap thumbnail = GetThumbnail(memStream, cx))
{
if (thumbnail != null && thumbnail.Size.Width > 0 && thumbnail.Size.Height > 0)
{
phbmp = thumbnail.GetHbitmap(System.Drawing.Color.Transparent);
pdwAlpha = WTS_ALPHATYPE.WTSAT_ARGB;
}
}
}
}
}
/// <inheritdoc/>
public void GetThumbnail(uint cx, out IntPtr phbmp, out WTS_ALPHATYPE pdwAlpha)
{
phbmp = IntPtr.Zero;
pdwAlpha = WTS_ALPHATYPE.WTSAT_UNKNOWN;
if (cx == 0 || cx > MaxThumbnailSize)
{
return;
}
using var dataStream = new ReadonlyStream(this.Stream as IStream);
using var memStream = new MemoryStream();
dataStream.CopyTo(memStream);
memStream.Position = 0;
// AsRandomAccessStream() extension method from System.Runtime.WindowsRuntime
var pdf = PdfDocument.LoadFromStreamAsync(memStream.AsRandomAccessStream()).GetAwaiter().GetResult();
if (pdf.PageCount > 0)
{
using var page = pdf.GetPage(0);
var image = PageToImage(page, cx);
using Bitmap thumbnail = new Bitmap(image);
phbmp = thumbnail.GetHbitmap();
pdwAlpha = WTS_ALPHATYPE.WTSAT_RGB;
}
}
/// <summary>
/// Start the preview on the Control.
/// </summary>
/// <param name="dataSource">Stream reference to access source file.</param>
public override void DoPreview <T>(T dataSource)
{
this.SuspendLayout();
try
{
using (var dataStream = new ReadonlyStream(dataSource as IStream))
{
var memStream = new MemoryStream();
dataStream.CopyTo(memStream);
memStream.Position = 0;
try
{
// AsRandomAccessStream() extension method from System.Runtime.WindowsRuntime
var pdf = PdfDocument.LoadFromStreamAsync(memStream.AsRandomAccessStream()).GetAwaiter().GetResult();
if (pdf.PageCount > 0)
{
InvokeOnControlThread(() =>
{
_flowLayoutPanel = new FlowLayoutPanel
{
AutoScroll = true,
AutoSize = true,
Dock = DockStyle.Fill,
FlowDirection = FlowDirection.TopDown,
WrapContents = false,
};
_flowLayoutPanel.Resize += FlowLayoutPanel_Resize;
// Only show first 10 pages.
for (uint i = 0; i < pdf.PageCount && i < 10; i++)
{
using (var page = pdf.GetPage(i))
{
var image = PageToImage(page);
var picturePanel = new Panel()
{
Name = "picturePanel",
Margin = new Padding(6, 6, 6, 0),
Size = CalculateSize(image),
BorderStyle = BorderStyle.FixedSingle,
};
var picture = new PictureBox
{
Dock = DockStyle.Fill,
Image = image,
SizeMode = PictureBoxSizeMode.Zoom,
};
picturePanel.Controls.Add(picture);
_flowLayoutPanel.Controls.Add(picturePanel);
}
}
if (pdf.PageCount > 10)
{
var messageBox = new RichTextBox
{
Name = "messageBox",
Text = Resources.PdfMorePagesMessage,
BackColor = Color.LightYellow,
Dock = DockStyle.Fill,
Multiline = true,
ReadOnly = true,
ScrollBars = RichTextBoxScrollBars.None,
BorderStyle = BorderStyle.None,
};
messageBox.ContentsResized += RTBContentsResized;
_flowLayoutPanel.Controls.Add(messageBox);
}
Controls.Add(_flowLayoutPanel);
});
}
}
catch (Exception ex)
{
if (ex.Message.Contains("Unable to update the password. The value provided as the current password is incorrect.", StringComparison.Ordinal))
{
InvokeOnControlThread(() =>
{
Controls.Clear();
_infoBar = GetTextBoxControl(Resources.PdfPasswordProtectedError);
Controls.Add(_infoBar);
});
}
else
{
throw;
}
}
finally
{
memStream.Dispose();
}
}
PowerToysTelemetry.Log.WriteEvent(new PdfFilePreviewed());
}
catch (Exception ex)
{
PowerToysTelemetry.Log.WriteEvent(new PdfFilePreviewError {
Message = ex.Message
});
InvokeOnControlThread(() =>
{
Controls.Clear();
_infoBar = GetTextBoxControl(Resources.PdfNotPreviewedError);
Controls.Add(_infoBar);
});
}
finally
{
base.DoPreview(dataSource);
}
this.ResumeLayout(false);
this.PerformLayout();
}