/usr/share/pyshared/guiqwt/qthelpers.py is in python-guiqwt 2.1.6-1.
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#
# Copyright © 2011 CEA
# Pierre Raybaut
# Licensed under the terms of the CECILL License
# (see guidata/__init__.py for details)
"""
qthelpers
---------
The ``guiqwt.qthelpers`` module provides helper functions for developing
easily Qt-based graphical user interfaces with guiqwt.
Ready-to-use open/save dialogs:
:py:data:`guiqwt.qthelpers.exec_image_save_dialog`
Executes an image save dialog box (QFileDialog.getSaveFileName)
:py:data:`guiqwt.qthelpers.exec_image_open_dialog`
Executes an image open dialog box (QFileDialog.getOpenFileName)
:py:data:`guiqwt.qthelpers.exec_images_open_dialog`
Executes an image*s* open dialog box (QFileDialog.getOpenFileNames)
Reference
~~~~~~~~~
.. autofunction:: exec_image_save_dialog
.. autofunction:: exec_image_open_dialog
.. autofunction:: exec_images_open_dialog
"""
import sys, os.path as osp
from guidata.qt.QtGui import QMessageBox
from guidata.qt.compat import getsavefilename, getopenfilename, getopenfilenames
# Local imports
from guiqwt.config import _
from guiqwt.io import (IMAGE_SAVE_FILTERS, IMAGE_LOAD_FILTERS,
array_to_imagefile, imagefile_to_array)
#===============================================================================
# Ready-to-use open/save dialogs
#===============================================================================
def exec_image_save_dialog(data, parent, basedir='', app_name=None):
"""
Executes an image save dialog box (QFileDialog.getSaveFileName)
* data: image pixel array data
* parent: parent widget (None means no parent)
* basedir: base directory ('' means current directory)
* app_name (opt.): application name (used as a title for an eventual
error message box in case something goes wrong when saving image)
Returns filename if dialog is accepted, None otherwise
"""
saved_in, saved_out, saved_err = sys.stdin, sys.stdout, sys.stderr
sys.stdout = None
filename, _filter = getsavefilename(parent, _("Save as"), basedir,
IMAGE_SAVE_FILTERS)
sys.stdin, sys.stdout, sys.stderr = saved_in, saved_out, saved_err
if filename:
filename = unicode(filename)
try:
array_to_imagefile(data, filename)
return filename
except Exception, msg:
import traceback
traceback.print_exc()
QMessageBox.critical(parent,
_('Error') if app_name is None else app_name,
(_(u"%s could not be written:") % osp.basename(filename))+\
"\n"+str(msg))
return
def exec_image_open_dialog(parent, basedir='', app_name=None,
to_grayscale=True):
"""
Executes an image open dialog box (QFileDialog.getOpenFileName)
* parent: parent widget (None means no parent)
* basedir: base directory ('' means current directory)
* app_name (opt.): application name (used as a title for an eventual
error message box in case something goes wrong when saving image)
* to_grayscale (default=True): convert image to grayscale
Returns (filename, data) tuple if dialog is accepted, None otherwise
"""
saved_in, saved_out, saved_err = sys.stdin, sys.stdout, sys.stderr
sys.stdout = None
filename, _filter = getopenfilename(parent, _("Open"), basedir,
IMAGE_LOAD_FILTERS)
sys.stdin, sys.stdout, sys.stderr = saved_in, saved_out, saved_err
filename = unicode(filename)
try:
data = imagefile_to_array(filename, to_grayscale=to_grayscale)
except Exception, msg:
import traceback
traceback.print_exc()
QMessageBox.critical(parent,
_('Error') if app_name is None else app_name,
(_(u"%s could not be opened:") % osp.basename(filename))+\
"\n"+str(msg))
return
return filename, data
def exec_images_open_dialog(parent, basedir='', app_name=None,
to_grayscale=True):
"""
Executes an image*s* open dialog box (QFileDialog.getOpenFileNames)
* parent: parent widget (None means no parent)
* basedir: base directory ('' means current directory)
* app_name (opt.): application name (used as a title for an eventual
error message box in case something goes wrong when saving image)
* to_grayscale (default=True): convert image to grayscale
Yields (filename, data) tuples if dialog is accepted, None otherwise
"""
saved_in, saved_out, saved_err = sys.stdin, sys.stdout, sys.stderr
sys.stdout = None
filenames, _filter = getopenfilenames(parent, _("Open"), basedir,
IMAGE_LOAD_FILTERS)
sys.stdin, sys.stdout, sys.stderr = saved_in, saved_out, saved_err
filenames = [unicode(fname) for fname in list(filenames)]
for filename in filenames:
try:
data = imagefile_to_array(filename, to_grayscale=to_grayscale)
except Exception, msg:
import traceback
traceback.print_exc()
QMessageBox.critical(parent,
_('Error') if app_name is None else app_name,
(_(u"%s could not be opened:") % osp.basename(filename))+\
"\n"+str(msg))
return
yield filename, data
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