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How to turn on "touch pinch gesture" on viewer?
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frogcafe  
#1 Posted : Monday, March 14, 2016 5:14:32 PM(UTC)
frogcafe

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May I know how to turn on "touch pinch gesture" on the viewer and also allow "Ctrl" key + mouse wheel for zooming?

Edited by user Monday, March 14, 2016 5:50:27 PM(UTC)  | Reason: Not specified
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Paul Rayman  
#2 Posted : Tuesday, March 15, 2016 12:48:38 AM(UTC)
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To implement the Zoom with Ctrl+MouseWeel you can create derived class like shown below.
Please note, the PdfViewer.SizeMode should be set to SizeModes.Zoom.

Code:

public class MyPdfViewer : PdfViewer
{
	private float _maxPageSize = 0;
	protected override void OnDocumentLoaded(EventArgs e)
	{
		foreach(var p in Document.Pages)
		{
			if (p.Width > _maxPageSize)
				_maxPageSize = p.Width;
			if (p.Height > _maxPageSize)
				_maxPageSize = p.Height;
		}
		base.OnDocumentLoaded(e);
		SizeMode = SizeModes.Zoom;
		Zoom = 1;
	}

	protected override void OnMouseWheel(MouseEventArgs e)
	{
		if ((ModifierKeys & Keys.Control) == Keys.Control)
		{
			float newZoom = Zoom;
			if (e.Delta < 0)
				newZoom *= 0.9f;
			else
				newZoom /= 0.9f;

			if (_maxPageSize * newZoom >100 &&_maxPageSize * newZoom < 5000)
				Zoom = newZoom;

		}
		else
			base.OnMouseWheel(e);
	}
}


To implement touch pinch gesture you can use the same technique.

Edited by user Tuesday, March 15, 2016 1:04:53 AM(UTC)  | Reason: Not specified
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frogcafe  
#3 Posted : Tuesday, March 15, 2016 1:22:40 PM(UTC)
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If PdfViewer.SizeModes is set to SizeModes.Zoom, the web link will not be clickable. I used Pdfium (not .Net SDK) PdfRenderer to display PDF, it allows Ctrl-MouseWheel as well as clickable web link. Will it be any workaround way?
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Paul Rayman  
#4 Posted : Tuesday, March 15, 2016 6:21:09 PM(UTC)
Paul Rayman

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I am checked it - everything works fine. The WebLinks and PdfLinks are clickable in a Zoom size mode.

What do you mean then talking "PdfRenderer to display PDF"? Pdfium does not have anything called "PdfRenderer"
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thanks 1 user thanked Paul Rayman for this useful post.
frogcafe on 3/16/2016(UTC)
frogcafe  
#5 Posted : Wednesday, March 16, 2016 4:22:30 AM(UTC)
frogcafe

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Posts: 4

Thanks: 2 times
  1. Because I tried using Zoom size but not clickable, I'll check it out with your code.
  2. PdfRenderer


Thx

Edited by user Wednesday, March 16, 2016 4:23:53 AM(UTC)  | Reason: Not specified
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apostol.bakalov  
#6 Posted : Monday, October 3, 2022 11:09:24 AM(UTC)
apostol.bakalov

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Posts: 5
Man
Bulgaria
Hello,

Would it be possible to share a sample for pinch zoom for touch screens?
The pinch gestures work great with the touchpad of the laptop, but I have not had much luck to get it to work with touch screens.

I have tried using the touch events, but I am not sure I get all the pertinent information.

Best regards,
Apostol Bakalov

Originally Posted by: Paul Rayman Go to Quoted Post
To implement the Zoom with Ctrl+MouseWeel you can create derived class like shown below.
Please note, the PdfViewer.SizeMode should be set to SizeModes.Zoom.

Code:

public class MyPdfViewer : PdfViewer
{
	private float _maxPageSize = 0;
	protected override void OnDocumentLoaded(EventArgs e)
	{
		foreach(var p in Document.Pages)
		{
			if (p.Width > _maxPageSize)
				_maxPageSize = p.Width;
			if (p.Height > _maxPageSize)
				_maxPageSize = p.Height;
		}
		base.OnDocumentLoaded(e);
		SizeMode = SizeModes.Zoom;
		Zoom = 1;
	}

	protected override void OnMouseWheel(MouseEventArgs e)
	{
		if ((ModifierKeys & Keys.Control) == Keys.Control)
		{
			float newZoom = Zoom;
			if (e.Delta < 0)
				newZoom *= 0.9f;
			else
				newZoom /= 0.9f;

			if (_maxPageSize * newZoom >100 &&_maxPageSize * newZoom < 5000)
				Zoom = newZoom;

		}
		else
			base.OnMouseWheel(e);
	}
}


To implement touch pinch gesture you can use the same technique.
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