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__init__.py
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__init__.py
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"""Service dedicated to exporting diagrams to a variety of file formats."""
import os
import logging
import cairo
from gaphas.freehand import FreeHandPainter
from gaphas.painter import ItemPainter, BoundingBoxPainter
from gaphas.view import Context, View
from gaphor.core import _, action
from gaphor.abc import Service, ActionProvider
from gaphor.ui.filedialog import FileDialog
from gaphor.ui.questiondialog import QuestionDialog
logger = logging.getLogger(__name__)
def paint(view, cr):
view.painter.paint(Context(cairo=cr, items=view.canvas.get_all_items(), area=None))
class DiagramExport(Service, ActionProvider):
"""
Service for exporting diagrams as images (SVG, PNG, PDF).
"""
def __init__(self, diagrams, properties, export_menu):
self.diagrams = diagrams
self.properties = properties
self.export_menu = export_menu
export_menu.add_actions(self)
def shutdown(self):
self.export_menu.remove_actions(self)
def save_dialog(self, diagram, title, ext):
filename = (diagram.name or "export") + ext
file_dialog = FileDialog(title, action="save", filename=filename)
save = False
while True:
filename = file_dialog.selection
if os.path.exists(filename):
question = _(
"The file {filename} already exists. Do you want to replace it?"
).format(filename=filename)
question_dialog = QuestionDialog(question)
answer = question_dialog.answer
question_dialog.destroy()
if answer:
save = True
break
else:
save = True
break
file_dialog.destroy()
if save and filename:
return filename
def update_painters(self, view):
sloppiness = self.properties.get("diagram.sloppiness", 0)
if sloppiness:
view.painter = FreeHandPainter(ItemPainter(), sloppiness)
view.bounding_box_painter = FreeHandPainter(
BoundingBoxPainter(), sloppiness
)
else:
view.painter = ItemPainter()
def render(self, canvas, new_surface):
view = View(canvas)
self.update_painters(view)
# Update bounding boxes with a temporary CairoContext
# (used for stuff like calculating font metrics)
tmpsurface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 0, 0)
tmpcr = cairo.Context(tmpsurface)
view.update_bounding_box(tmpcr)
tmpcr.show_page()
tmpsurface.flush()
w, h = view.bounding_box.width, view.bounding_box.height
surface = new_surface(w, h)
cr = cairo.Context(surface)
view.matrix.translate(-view.bounding_box.x, -view.bounding_box.y)
paint(view, cr)
cr.show_page()
return surface
def save_svg(self, filename, canvas):
surface = self.render(canvas, lambda w, h: cairo.SVGSurface(filename, w, h))
surface.flush()
surface.finish()
def save_png(self, filename, canvas):
surface = self.render(
canvas,
lambda w, h: cairo.ImageSurface(
cairo.FORMAT_ARGB32, int(w + 1), int(h + 1)
),
)
surface.write_to_png(filename)
def save_pdf(self, filename, canvas):
surface = self.render(canvas, lambda w, h: cairo.PDFSurface(filename, w, h))
surface.flush()
surface.finish()
@action(
name="file-export-svg",
label=_("Export to SVG"),
tooltip=_("Export diagram to SVG"),
)
def save_svg_action(self):
title = _("Export diagram to SVG")
ext = ".svg"
diagram = self.diagrams.get_current_diagram()
filename = self.save_dialog(diagram, title, ext)
if filename:
self.save_svg(filename, diagram.canvas)
@action(
name="file-export-png",
label=_("Export to PNG"),
tooltip=_("Export diagram to PNG"),
)
def save_png_action(self):
title = _("Export diagram to PNG")
ext = ".png"
diagram = self.diagrams.get_current_diagram()
filename = self.save_dialog(diagram, title, ext)
if filename:
self.save_png(filename, diagram.canvas)
@action(
name="file-export-pdf",
label=_("Export to PDF"),
tooltip=_("Export diagram to PDF"),
)
def save_pdf_action(self):
title = _("Export diagram to PDF")
ext = ".pdf"
diagram = self.diagrams.get_current_diagram()
filename = self.save_dialog(diagram, title, ext)
if filename:
self.save_pdf(filename, diagram.canvas)