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# Source code for camelot.view.action_steps.print_preview

    #  ============================================================================
    #
    #  Copyright (C) 2007-2011 Conceptive Engineering bvba. All rights reserved.
    #  www.conceptive.be / project-camelot@conceptive.be
    #
    #  This file is part of the Camelot Library.
    #
    #  This file may be used under the terms of the GNU General Public
    #  License version 2.0 as published by the Free Software Foundation
    #  and appearing in the file license.txt included in the packaging of
    #  this file.  Please review this information to ensure GNU
    #  General Public Licensing requirements will be met.
    #
    #  If you are unsure which license is appropriate for your use, please
    #  visit www.python-camelot.com or contact project-camelot@conceptive.be
    #
    #  This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    #  WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    #
    #  For use of this library in commercial applications, please contact
    #  project-camelot@conceptive.be
    #
    #  ============================================================================

    from PyQt4 import QtCore, QtGui

    from camelot.admin.action import ActionStep

    class PrintPreview( ActionStep ):
        """
        Display a print preview dialog box.

        :param document: an instance of :class:`QtGui.QTextDocument` or
            :class:`QtWebKit.QWebView` that has a :meth:`print_` method.  The
            thread affinity of this object will be changed to be able to use it
            in the GUI.

        the print preview can be customised using these attributes :

        .. attribute:: page_size

            the page size, by default :class:`QtGui.QPrinter.A4` is used

        .. attribute:: page_orientation

            the page orientation, by default :class:`QtGui.QPrinter.Portrait`
            is used.

        .. image:: /_static/simple_report.png
            """

        def __init__( self, document ):
            self.document = document
            self.document.moveToThread( QtGui.QApplication.instance().thread() )
            self.printer = None
            self.page_size = None
            self.page_orientation = None

        def render( self ):
            """create the print preview widget. this method is used to unit test
            the action step."""
            if not self.printer:
                self.printer = QtGui.QPrinter()
            if not self.printer.isValid():
                self.printer.setOutputFormat( QtGui.QPrinter.PdfFormat )
            if self.page_size != None:
                self.printer.setPageSize( self.page_size )
            if self.page_orientation != None:
                self.printer.setOrientation( self.page_orientation )
            dialog = QtGui.QPrintPreviewDialog( self.printer, flags=QtCore.Qt.Window )
            dialog.paintRequested.connect( self.paint_on_printer )
            # show maximized seems to trigger a bug in qt which scrolls the page
            # down dialog.showMaximized()
            desktop = QtGui.QApplication.desktop()
            available_geometry = desktop.availableGeometry( dialog )
            # use the size of the screen instead to set the dialog size
            dialog.resize( available_geometry.width() * 0.75,
                           available_geometry.height() * 0.75 )
            return dialog

        @QtCore.pyqtSlot( QtGui.QPrinter )
        def paint_on_printer( self, printer ):
            self.document.print_( printer )

        def gui_run( self, gui_context ):
            dialog = self.render()
            dialog.exec_()

    class PrintHtml( PrintPreview ):
        """
        Display a print preview dialog box for an html string.

        :param html: a string containing the html to render in the print
            preview.

        the rendering of the html can be customised using the same attributes
        as those of the :class:`PrintPreview` class.
            """

        def __init__( self, html ):
            document = QtGui.QTextDocument()
            document.setHtml( html )
            super( PrintHtml, self ).__init__( document )

    class PrintJinjaTemplate( PrintPreview ):
        """Render a jinja template into a print preview dialog.

        :param environment: a :class:`jinja2.Environment` object to be used
            to load templates from.

        :param template: the name of the template as it can be fetched from
            the Jinja environment.

        :param context: a dictionary with objects to be used when rendering
            the template
        """

        def __init__( self,
                      environment,
                      template,
                      context={}, ):
            template = environment.get_template( template )
            html = template.render( context )
            super( PrintJinjaTemplate, self).__init__( html )

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