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Control Styling - Styling controls seems to be a no go
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cjansen  
#1 Posted : Wednesday, August 15, 2018 2:56:20 PM(UTC)
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cjansen

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Is there a simple way to apply some styles (background colour, etc.) to field controls (widgets or w/e)?

Is seems that all of the properties are get; only.
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Paul Rayman  
#2 Posted : Wednesday, August 15, 2018 7:12:32 PM(UTC)
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You may try to change them through its Dictionary Property.

But the appearance of most controls is specified through an appearance stream of that control. Most likely you need to change this one.

If you provide a document and tell me what you want to change, I might try to make a sample code for you.
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cjansen  
#3 Posted : Thursday, August 16, 2018 8:01:42 AM(UTC)
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cjansen

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I don't have a specific form just now but let's use the case of "highlighting" (changing the background colour) of a textbox.

I, in my blissful ignorance, proceeded as such

Code:
var field = pdfControl.Document.GetField("field_name"); // extension method
foreach (var control in field.Controls)
{
    control.BackColor = "yellow"; // super contrived
}



So, yeh, I've been reading up on appearance streams but if you could fast-track this, that would be great. =)
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Paul Rayman  
#4 Posted : Thursday, August 16, 2018 8:07:46 AM(UTC)
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Originally Posted by: cjansen Go to Quoted Post
I don't have a specific form just now but let's use the case of "highlighting" (changing the background colour) of a textbox.


Do you need to highlight acroform fields in the PdfViewer control?
Seems FormHighlightColor property is that you are looking for.
https://pdfium.patagames...99-63a6-13c80e90b755.htm

Edited by user Thursday, August 16, 2018 8:10:34 AM(UTC)  | Reason: Not specified
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cjansen  
#5 Posted : Thursday, August 16, 2018 8:20:31 AM(UTC)
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cjansen

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that was just an example.

Let's say I want to make a blue border with a pink background colour?

I understand that the control has an AP entry in its dictionary and the AP entry can have entries for N, R, and D. and that those have (indirect links?) to FormXObjects?

But, honestly, I'm not sure how to implement this.
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Paul Rayman  
#6 Posted : Thursday, August 16, 2018 9:27:44 AM(UTC)
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Well... acro field control it is the widget annotation.
This too complex subject for discuss.
Usual appearance of this annotation is designed by the creator of the concrete PDF document. So styling of this in general may be difficult.
You may found more info about widgets here on a page 640
http://archimedespalimps...al/pdf_reference_1-7.pdf

Some things may be changed via dictionary parameters.
Some of them via appearance stream only.
And some are not widgets at all, although you can visually think that they are. For example, some widgets may not have any contours, but these contours are drawn separately around the widget.

Here the example how to change font, font size and stroke color for the widget under mouse cursor.
Code:
        private void pdfViewer1_DoubleClick(object sender, EventArgs e)
        {
            var mouse = e as MouseEventArgs;
            var pagePoint = pdfViewer1.ClientToPage(pdfViewer1.CurrentIndex, mouse.Location);
            int zOrder;
            var ctrl = pdfViewer1.CurrentPage.GetControlAtPoint(pagePoint.X, pagePoint.Y, out zOrder);
            if(ctrl!= null)
            {
                ctrl.Dictionary["DA"] = PdfTypeString.Create("/Arial 9 Tf 1 0 0 rg");
            }

            pdfViewer1.CurrentPage.Dispose();
            pdfViewer1.ClearRenderBuffer();
            pdfViewer1.Invalidate();
        }



Here is an example how to generate stream which can be used as an appearance stream for an annotation
https://forum.patagames....-Embedded-Fonts#post1430

Edited by user Thursday, August 16, 2018 9:31:08 AM(UTC)  | Reason: Not specified
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