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Caching highlights outside of PDF file

ruslan.iskhakov
Topic Author
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10 years 2 months ago #10800 by ruslan.iskhakov

Caching highlights outside of PDF file was created by ruslan.iskhakov

Hello.

I would like to let user create his own selections in PDF file, then when user opens this PDF file again he can see exactly the same highlights restored from cache.
The PDF file should't be changed, all highlights should be cached outside of the PDF, in SQL DB for example,
Does the SDK provides such feature? Is it possible to modify something to add this functionality? Would it be possible to take a look at some code snippets?

Thanks in advance,
Ruslan

Davide
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10 years 2 months ago #10802 by Davide

Replied by Davide on topic Caching highlights outside of PDF file

Hi,
I suggest you to save the coordinates of first and last character of the highlighted text, the page number and then re-create the highlight when you re-open the pdf.
To calculate the first (m_index1) and last (m_index2) char index :

Code:

float pt[] = new float[2];
		pt[0] = m_annot_pos.x;
		pt[1] =  m_annot_pos.y;
		m_index1 = m_page.ObjsGetCharIndex(pt);
		pt[0] = m_annot_page.ToPDFX(event.getX(), m_layout.vGetX());
		pt[1] = m_annot_page.ToPDFY(event.getY(), m_layout.vGetY());
		m_index2 = m_page.ObjsGetCharIndex(pt);

You should look at PDFLayoutView.onTouchSelect to better understand how it works.

I suggest you to check this line of code to re-create the highlight :

Code:

m_page.AddAnnotMarkup(m_index1, m_index2, type);

mrawy
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9 years 11 months ago - 9 years 11 months ago #11260 by mrawy

Replied by mrawy on topic Caching highlights outside of PDF file

Hi,
Where can i write this code?
I want to implement highlight and underline annotations manually using this method

Code:

page.AddAnnotMarkup(index1, index2, TYPE);

Instead of this method

Code:

pdfView.vSetSelMarkup(TYPE);

I tried something like that but the

Code:

page.ObjsGetCharIndex(pt)

method always return -1:

Code:

@Override
    public void OnPDFSelecting(Canvas canvas, int[] rect1, int[] rect2) {

        Paint paint = new Paint();

        paint.setColor(Color.parseColor(mSelectingColor));

        if (rect2[1] > rect1[3]) {

            canvas.drawCircle(rect1[0], rect1[1], 5, paint);

            canvas.drawCircle(rect2[2], rect2[3], 5, paint);

            mTargetPosition = pdfView.vGetPos(rect1[0], rect1[1]);

            mStartSelectedTextX = rect1[0];

            mStartSelectedTextY = rect1[1];

            mEndSelectedTextX = rect2[2];

            mEndSelectedTextY = rect2[3];

        } else {

            canvas.drawCircle(rect2[0], rect2[1], 5, paint);

            canvas.drawCircle(rect1[2], rect1[3], 5, paint);

            mTargetPosition = pdfView.vGetPos(rect2[0], rect2[1]);

            mStartSelectedTextX = rect2[0];

            mStartSelectedTextY = rect2[1];

            mEndSelectedTextX = rect1[2];

            mEndSelectedTextY = rect1[3];

        }

    }

Code:

@Override
    public void OnPDFSelectEnd() {

        PDFView.PDFPos pos = pdfView.vGetPos((int) mStartSelectedTextX, (int) mStartSelectedTextY);

        PDFVPage vPage = pdfView.vGetPage(pos.pageno);

        Page page = vPage.GetPage();

        int index1 = -1, index2 = -1;

        if (page != null) {

            float pt[] = new float[2];

            pt[0] = mStartSelectedTextX;

            pt[1] = mStartSelectedTextY;

            index1 = page.ObjsGetCharIndex(pt);

            pt[0] = vPage.ToPDFX(mEndSelectedTextX, pdfView.vGetX());

            pt[1] = vPage.ToPDFY(mEndSelectedTextY, pdfView.vGetY());

            index2 = page.ObjsGetCharIndex(pt);

        }

        if (index1 != -1 && index2 != -1) {

            boolean result = page.AddAnnotMarkup(index1, index2, Constants.HIGHLIGHT_TYPE);

            pdfView.vRenderSync(vPage);

            pdfSave();

            setAnnotationColor(Color.parseColor(mHighlightColor));

            mPdfReaderListener.onHighlightEnd(result,
                    mTargetPosition.pageno + 1,
                    mHighlightColor,
                    mStartSelectedTextX, mStartSelectedTextY,
                    mEndSelectedTextX, mEndSelectedTextY);

        }

    }

Kindly advice

Last edit: 9 years 11 months ago by mrawy.

Davide
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9 years 11 months ago #11266 by Davide

Replied by Davide on topic Caching highlights outside of PDF file

Hi,
you have to call

Code:

page.ObjsStart();

before using page.ObjsGetCharIndex(pt)

For more info check this : www.radaeepdf.com/documentation/javadocs...age.html#ObjsStart--

mrawy
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Junior Member

9 years 11 months ago #11267 by mrawy

Replied by mrawy on topic Caching highlights outside of PDF file

Hi,
I modified the OnPDFSelecting and OnPDFSelectEnd methods in PDFReader class to be like this:

Code:

public void OnPDFSelecting(Canvas canvas, int[] rect1, int[] rect2)
	{
		Paint paint = new Paint();
		paint.setARGB(0x80, 0, 0, 0x80);
		if( rect2[1] > rect1[3] )
		{
			canvas.drawCircle( rect1[0], rect1[1], 5, paint);
			canvas.drawCircle( rect2[2], rect2[3], 5, paint);
			float[] rect = new float[3];
			rect[0] = rect1[0];
			rect[1] = rect1[1];
			rect[2] = rect2[2];
			rect[3] = rect2[3];
			myRects = rect;
		}
		else
		{
			canvas.drawCircle( rect2[0], rect2[1], 5, paint);
			canvas.drawCircle( rect1[2], rect1[3], 5, paint);
			float[] rect = new float[4];
			rect[0] = rect2[0];
			rect[1] = rect2[1];
			rect[2] = rect1[2];
			rect[3] = rect1[3];
			myRects = rect;
		}
	}

Code:

public void OnPDFSelectEnd()
	{
		PDFPos pos = m_view.vGetPos((int)myRects[0], (int)myRects[1]);
		PDFVPage vpage = m_view.vGetPage(pos.pageno);
		Page page = vpage.GetPage();
		if( page != null )
		{
			page.ObjsStart();
			float pt[] = new float[2];
			pt[0] = pos.x;
			pt[1] = pos.y;
			int m_index1 = page.ObjsGetCharIndex(pt);
			pt[0] = vpage.ToPDFX(myRects[2], m_view.vGetX());
			pt[1] = vpage.ToPDFY(myRects[3], m_view.vGetY());
			int m_index2 = page.ObjsGetCharIndex(pt);
			page.AddAnnotMarkup(m_index1, m_index2, 0);
			m_view.vRenderSync(vpage);
			if( m_listener != null )
				m_listener.OnPageModified(vpage.GetPageNo());
		}

//		if( m_listener != null )
//			m_listener.OnSelectEnd(m_view.vGetSel());
	}

And it's working but i still have a problem. I selected the "Linux Fundamentals" statement but the result is "inux Fundamental"

nermeen
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Platinum Member

9 years 11 months ago #11276 by nermeen

Replied by nermeen on topic Caching highlights outside of PDF file

Dear Mrawy,

You can call the following methods before: page.AddAnnotMarkup(m_index1, m_index2, 0);

Code:

m_index1 = m_page.ObjsAlignWord(m_index1, -1);
m_index2 = m_page.ObjsAlignWord(m_index2, 1);

Note:

Code:

/**
	 * get index aligned by word. this can be invoked after ObjsStart
	 * @param from 0 based unicode index.
	 * @param dir if dir < 0,  get start index of the word. otherwise get last index of the word.
	 * @return new index value.
	 */
    final public int ObjsAlignWord( int from, int dir )  {}

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