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from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import A4
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, PageBreak, Flowable
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.lib.units import inch
from reportlab.lib.pagesizes import letter
from reportlab.lib import colors
from reportlab.lib.units import mm


class NumberedBookmarkCanvas(canvas.Canvas):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._saved_page_states = []
        self._bookmarks = []
        self._current_page = 0

    def showPage(self):
        # Speichern des aktuellen Seitenstatus und wechseln zur neuen Seite
        self._saved_page_states.append(dict(self.__dict__))
        self._current_page += 1
        self._startPage()

    def save(self):
        num_pages = len(self._saved_page_states)
        for state in self._saved_page_states:
            self.__dict__.update(state)
            self.draw_page_number(num_pages)
            canvas.Canvas.showPage(self)

        self.add_bookmarks()
        canvas.Canvas.save(self)

    def draw_page_number(self, page_count):
        self.setFont("Helvetica", 8)
        self.drawRightString(190*mm, 10*mm, f"Page {self._pageNumber} / {page_count}")

    def add_bookmarks(self):
        for title, name in self._bookmarks:
            self.addOutlineEntry(title, name, level=0, closed=False)

    def add_bookmark(self, title, name):
        self._bookmarks.append((title, name))


class LinkFlowable(Flowable):
    def __init__(self, text, target):
        super().__init__()
        self.text = text
        self.target = target
        self.width = 0
        self.height = 0

    def wrap(self, availWidth, availHeight):
        from reportlab.pdfbase.pdfmetrics import stringWidth
        self.width = stringWidth(self.text, "Helvetica", 10)
        self.height = 10
        return self.width, self.height

    def draw(self):
        self.canv.setFont("Helvetica", 10)
        self.canv.drawString(100, 0, self.text)

        self.canv.linkRect(
            "",
            self.target,
            (100, 0, 100 + self.width, 10),
            relative=1
        )


class BookmarkFlowable(Flowable):
    def __init__(self, name, title, level=0):
        super().__init__()
        self.name = name
        self.title = title
        self.level = level

    def wrap(self, availWidth, availHeight):
        return 0, 0

    def draw(self):
        self.canv.bookmarkPage(self.name)
        self.canv.add_bookmark(self.title, self.name)


def create_pdf_with_multibuild(filename):
    doc = SimpleDocTemplate(filename, pagesize=A4)
    story = []
    styles = getSampleStyleSheet()

    def prepare_story():
        
        # Titelseite
        story.append(Paragraph("Titelseite:", styles["Normal"]))
        story.append(Spacer(1, 12))
        story.append(PageBreak())

        # Kapitel 1
        story.append(Paragraph("Kapitel 1: Einleitung", styles["Heading1"]))
        story.append(BookmarkFlowable("chapter1", "Kapitel 1: Einleitung"))
        story.append(LinkFlowable("Gehe zu Kapitel 2", "chapter2"))
        story.append(Spacer(1, 12))
        story.append(LinkFlowable("Gehe zu Kapitel 3", "chapter3"))
        story.append(Spacer(1, 12))

        # Kapitel 2
        story.append(PageBreak())
        story.append(BookmarkFlowable("chapter2", "Kapitel 2: Details"))
        story.append(Paragraph("Kapitel 2: Details", styles["Heading1"]))
        story.append(Spacer(1, 12))
        story.append(Paragraph("Hier ist der Inhalt von Kapitel 2.", styles["Normal"]))

        # Kapitel 3
        story.append(PageBreak())
        story.append(BookmarkFlowable("chapter3", "Kapitel 3: Weitere Details"))
        story.append(Paragraph("Kapitel 3: Weitere Details", styles["Heading1"]))
        story.append(Spacer(1, 12))
        story.append(Paragraph("Hier ist der Inhalt von Kapitel 3.", styles["Normal"]))

    prepare_story()

    doc.multiBuild(story, canvasmaker=NumberedBookmarkCanvas)


create_pdf_with_multibuild("interactive_links_and_bookmarks_with_numbered_canvas.pdf")

Code: Alles auswählen

def draw(self):
        dest = self.canv.bookmarkPage(self.name, fit="XYZ")
        print("Drawing Floawble:")
        print("-> Bookmark Results:",dest.name, dest.page.name)	
        print("-> Current Canvas Page:", self.canv._pageNumber)	# returns current page number currectly (Canvas)
        print("-> Current Document Page:", self.canv._doc.thisPageRef().name) # this will be referenced as destination for bookmarks; points at 'Page1' (Document)
        print("-> Document Pages:", self.canv._doc.Pages.pages)	# currently empty
        self.canv.add_bookmark(self.title, self.name)