DrawPagesCallback.cs

public class DrawPagesCallback : PDFXEdit.IPXV_PagesViewDrawCallback
{
	public PDFXEdit.IAUX_Inst m_aInst;
	public PDFXEdit.IUIX_Inst m_uiInst;
	private PDFXEdit.IColor m_clrFill;
	private PDFXEdit.IColor m_clrBorder;
	private PDFXEdit.PXC_Rect m_rcDraw;
	PDFXEdit.IUIX_Brush m_Brush;
	PDFXEdit.IUIX_Pen m_Pen;
	public DrawPagesCallback(PDFXEdit.IAUX_Inst aInst, PDFXEdit.IUIX_Inst uiInst)
	{
		m_aInst = aInst;
		m_uiInst = uiInst;
		m_clrFill = m_aInst.CreateColor(PDFXEdit.ColorType.ColorType_RGB);
		m_clrFill.SetRGB(0.0f, 1.0f, 1.0f);
		m_clrBorder = m_aInst.CreateColor(PDFXEdit.ColorType.ColorType_RGB);
		m_clrBorder.SetRGB(0.0f, 1.0f, 0.0f);
		m_rcDraw.left = 0;
		m_rcDraw.right = 100;
		m_rcDraw.top = 100;
		m_rcDraw.bottom = 0;
		m_Brush = m_uiInst.CreateNewBrush();
		m_Pen = m_uiInst.CreateNewPen();
		m_Brush.Color0 = m_clrFill.RGB;
		m_Brush.Color1 = m_clrFill.RGB;
		m_Pen.Brush.Color0 = m_clrBorder.RGB;
		m_Pen.Brush.Color1 = m_clrBorder.RGB;
		m_Pen.Width = 10;
		m_Pen.Inside = true;

	}
	public void OnDrawPagesView(PDFXEdit.IPXV_PagesView pView, PDFXEdit.PXV_PagesViewDrawStage nStage, PDFXEdit.IUIX_RenderContext pRC, PDFXEdit.IPXV_PagesLayoutRegions pPageRegions)
	{
		if (pView == null)
			return;
		//Drawing rectangle on the foreground
		if (nStage == PDFXEdit.PXV_PagesViewDrawStage.PXV_PagesViewDraw_Foreground)
		{
			DrawRectangle(pView, pRC, 0);
			
		}
	}

	public void DrawRectangle(PDFXEdit.IPXV_PagesView pView, PDFXEdit.IUIX_RenderContext pRC_, uint nPage)
	{
		PDFXEdit.IPXV_PagesLayoutManager plm = pView.Layout;
		if (plm == null)
			return;

		PDFXEdit.PXC_Matrix p2v = plm.GetPageToDeviceMatrix(nPage, true);
		PDFXEdit.PXC_Rect rc = m_rcDraw;
		m_aInst.MathHelper.Matrix_TransformRect(ref p2v, ref rc);
		
		//Flipping rectangle top and bottom coordinates and converting it's type
		PDFXEdit.tagRECT rcDR;
		rcDR.left = (int)rc.left;
		rcDR.right = (int)rc.right;
		rcDR.top = (int)rc.bottom;
		rcDR.bottom = (int)rc.top;

		pRC_.DrawRect(rcDR, m_Brush, m_Pen, ref rcDR, 1);
	}
}

DrawPagesCallback m_DPClbk = null;

private void drawRectangleOnPageToolStripMenuItem_Click(object sender, EventArgs e)
{
	if (m_DPClbk == null)
	{
		m_DPClbk = new DrawPagesCallback(auxInst, uiInst);
		//Registering callback at the needed document's pages view
		pdfCtl.Doc.ActiveView.PagesView.RegisterDrawCallback(PDFXEdit.PXV_PagesViewDrawStage.PXV_PagesViewDraw_Foreground, m_DPClbk);
		//!!! Do not forget to unregister it when document closes !!!
	}
}