[stable18] Prevent download, printing and text selection when download is hidden #181
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Even if the Download buttons are hidden in the toolbars it was still possible to trigger the download by using Ctrl|Meta+S. This directly calls the "PDFViewerApplication.download" function, so when downloads are hidden that function is now replaced with an empty function. Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
Even if the Print button was hidden in the toolbar it was still possible to trigger the printing by using Ctrl|Meta+P. This uses the print service from PDFViewer, so when the download is hidden the print service is now disabled. When printing is flagged as not supported in the PDFViewerApplication initialization the Print buttons are disabled, so it is no longer needed to disable them explicity. Moreover, this also fixes the Print button being disabled only in the toolbar, but not in the secondary toolbar (which is shown in smaller screens). Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
The Download button is hidden in both the toolbar and the secondary toolbar later, so it is not needed to hide it only for the toolbar first. Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
Even if printing was not possible using the PDFViewer printing services it was still possible to print the PDF document by printing the web page from the browser. As that can not be really prevented the best that can be done is hide all the content in the printed media using CSS. Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
When the PDF is rendered PDFViewer creates canvases with the contents of the pages and, in front of them, it creates too a layer with HTML text elements that makes possible to select it. That text layer is used too by the search function to highlight the results, so it can not be removed. Instead of that the selection of the text is prevented using CSS. Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>
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backport of #179