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openlp/openlp/core/lib/__init__.py

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# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4
###############################################################################
# OpenLP - Open Source Lyrics Projection #
# --------------------------------------------------------------------------- #
# Copyright (c) 2008-2018 OpenLP Developers #
# --------------------------------------------------------------------------- #
# This program is free software; you can redistribute it and/or modify it #
# under the terms of the GNU General Public License as published by the Free #
# Software Foundation; version 2 of the License. #
# #
# This program is distributed in the hope that it will be useful, but WITHOUT #
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or #
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for #
# more details. #
# #
# You should have received a copy of the GNU General Public License along #
# with this program; if not, write to the Free Software Foundation, Inc., 59 #
# Temple Place, Suite 330, Boston, MA 02111-1307 USA #
###############################################################################
"""
The :mod:`lib` module contains most of the components and libraries that make
OpenLP work.
"""
import logging
from PyQt5 import QtCore, QtGui, QtWidgets
from openlp.core.common.i18n import translate
from openlp.core.common.path import Path
from openlp.core.lib.formattingtags import FormattingTags
log = logging.getLogger(__name__ + '.__init__')
class ServiceItemContext(object):
"""
The context in which a Service Item is being generated
"""
Preview = 0
Live = 1
Service = 2
class ImageSource(object):
"""
This enumeration class represents different image sources. An image sources states where an image is used. This
enumeration class is need in the context of the :class:~openlp.core.lib.imagemanager`.
``ImagePlugin``
This states that an image is being used by the image plugin.
``Theme``
This says, that the image is used by a theme.
``CommandPlugins``
This states that an image is being used by a command plugin.
"""
ImagePlugin = 1
Theme = 2
CommandPlugins = 3
class MediaType(object):
"""
An enumeration class for types of media.
"""
Audio = 1
Video = 2
class ServiceItemAction(object):
"""
Provides an enumeration for the required action moving between service items by left/right arrow keys
"""
Previous = 1
PreviousLastSlide = 2
Next = 3
class ItemCapabilities(object):
"""
Provides an enumeration of a service item's capabilities
``CanPreview``
The capability to allow the ServiceManager to add to the preview tab when making the previous item live.
``CanEdit``
The capability to allow the ServiceManager to allow the item to be edited
``CanMaintain``
The capability to allow the ServiceManager to allow the item to be reordered.
``RequiresMedia``
Determines is the service_item needs a Media Player
``CanLoop``
The capability to allow the SlideController to allow the loop processing.
``CanAppend``
The capability to allow the ServiceManager to add leaves to the
item
``NoLineBreaks``
The capability to remove lines breaks in the renderer
``OnLoadUpdate``
The capability to update MediaManager when a service Item is loaded.
``AddIfNewItem``
Not Used
``ProvidesOwnDisplay``
The capability to tell the SlideController the service Item has a different display.
``HasDetailedTitleDisplay``
Being Removed and decommissioned.
``HasVariableStartTime``
The capability to tell the ServiceManager that a change to start time is possible.
``CanSoftBreak``
The capability to tell the renderer that Soft Break is allowed
``CanWordSplit``
The capability to tell the renderer that it can split words is
allowed
``HasBackgroundAudio``
That a audio file is present with the text.
``CanAutoStartForLive``
The capability to ignore the do not play if display blank flag.
``CanEditTitle``
The capability to edit the title of the item
``IsOptical``
Determines is the service_item is based on an optical device
``HasDisplayTitle``
The item contains 'displaytitle' on every frame which should be
preferred over 'title' when displaying the item
``HasNotes``
The item contains 'notes'
``HasThumbnails``
The item has related thumbnails available
``HasMetaData``
The item has Meta Data about item
"""
CanPreview = 1
CanEdit = 2
CanMaintain = 3
RequiresMedia = 4
CanLoop = 5
CanAppend = 6
NoLineBreaks = 7
OnLoadUpdate = 8
AddIfNewItem = 9
ProvidesOwnDisplay = 10
# HasDetailedTitleDisplay = 11
HasVariableStartTime = 12
CanSoftBreak = 13
CanWordSplit = 14
HasBackgroundAudio = 15
CanAutoStartForLive = 16
CanEditTitle = 17
IsOptical = 18
HasDisplayTitle = 19
HasNotes = 20
HasThumbnails = 21
HasMetaData = 22
def get_text_file_string(text_file_path):
"""
Open a file and return its content as a string. If the supplied file path is not a file then the function
returns False. If there is an error loading the file or the content can't be decoded then the function will return
None.
:param openlp.core.common.path.Path text_file_path: The path to the file.
:return: The contents of the file, False if the file does not exist, or None if there is an Error reading or
decoding the file.
:rtype: str | False | None
"""
if not text_file_path.is_file():
return False
content = None
try:
with text_file_path.open('r', encoding='utf-8') as file_handle:
if file_handle.read(3) != '\xEF\xBB\xBF':
# no BOM was found
file_handle.seek(0)
content = file_handle.read()
except (OSError, UnicodeError):
log.exception('Failed to open text file {text}'.format(text=text_file_path))
return content
def str_to_bool(string_value):
"""
Convert a string version of a boolean into a real boolean.
:param string_value: The string value to examine and convert to a boolean type.
:return: The correct boolean value
"""
if isinstance(string_value, bool):
return string_value
return str(string_value).strip().lower() in ('true', 'yes', 'y')
def build_icon(icon):
"""
Build a QIcon instance from an existing QIcon, a resource location, or a physical file location. If the icon is a
QIcon instance, that icon is simply returned. If not, it builds a QIcon instance from the resource or file name.
:param QtGui.QIcon | Path | QtGui.QIcon | str icon:
The icon to build. This can be a QIcon, a resource string in the form ``:/resource/file.png``, or a file path
location like ``Path(/path/to/file.png)``. However, the **recommended** way is to specify a resource string.
:return: The build icon.
:rtype: QtGui.QIcon
"""
if isinstance(icon, QtGui.QIcon):
return icon
pix_map = None
button_icon = QtGui.QIcon()
if isinstance(icon, str):
pix_map = QtGui.QPixmap(icon)
elif isinstance(icon, Path):
pix_map = QtGui.QPixmap(str(icon))
elif isinstance(icon, QtGui.QImage):
pix_map = QtGui.QPixmap.fromImage(icon)
if pix_map:
button_icon.addPixmap(pix_map, QtGui.QIcon.Normal, QtGui.QIcon.Off)
return button_icon
def image_to_byte(image, base_64=True):
"""
Resize an image to fit on the current screen for the web and returns it as a byte stream.
:param image: The image to converted.
:param base_64: If True returns the image as Base64 bytes, otherwise the image is returned as a byte array.
To preserve original intention, this defaults to True
"""
log.debug('image_to_byte - start')
byte_array = QtCore.QByteArray()
# use buffer to store pixmap into byteArray
buffie = QtCore.QBuffer(byte_array)
buffie.open(QtCore.QIODevice.WriteOnly)
image.save(buffie, "PNG")
log.debug('image_to_byte - end')
if not base_64:
return byte_array
# convert to base64 encoding so does not get missed!
return bytes(byte_array.toBase64()).decode('utf-8')
def create_thumb(image_path, thumb_path, return_icon=True, size=None):
"""
Create a thumbnail from the given image path and depending on ``return_icon`` it returns an icon from this thumb.
:param image_path: The image file to create the icon from.
:param thumb_path: The filename to save the thumbnail to.
:param return_icon: States if an icon should be build and returned from the thumb. Defaults to ``True``.
:param size: Allows to state a own size (QtCore.QSize) to use. Defaults to ``None``, which means that a default
height of 88 is used.
:return: The final icon.
"""
# TODO: To path object
thumb_path = Path(thumb_path)
reader = QtGui.QImageReader(str(image_path))
if size is None:
# No size given; use default height of 88
if reader.size().isEmpty():
ratio = 1
else:
ratio = reader.size().width() / reader.size().height()
reader.setScaledSize(QtCore.QSize(int(ratio * 88), 88))
elif size.isValid():
# Complete size given
reader.setScaledSize(size)
else:
# Invalid size given
if reader.size().isEmpty():
ratio = 1
else:
ratio = reader.size().width() / reader.size().height()
if size.width() >= 0:
# Valid width; scale height
reader.setScaledSize(QtCore.QSize(size.width(), int(size.width() / ratio)))
elif size.height() >= 0:
# Valid height; scale width
reader.setScaledSize(QtCore.QSize(int(ratio * size.height()), size.height()))
else:
# Invalid; use default height of 88
reader.setScaledSize(QtCore.QSize(int(ratio * 88), 88))
thumb = reader.read()
thumb.save(str(thumb_path), thumb_path.suffix[1:].lower())
if not return_icon:
return
if thumb_path.exists():
return build_icon(thumb_path)
# Fallback for files with animation support.
return build_icon(image_path)
def validate_thumb(file_path, thumb_path):
"""
Validates whether an file's thumb still exists and if is up to date. **Note**, you must **not** call this function,
before checking the existence of the file.
:param openlp.core.common.path.Path file_path: The path to the file. The file **must** exist!
:param openlp.core.common.path.Path thumb_path: The path to the thumb.
:return: Has the image changed since the thumb was created?
:rtype: bool
"""
if not thumb_path.exists():
return False
image_date = file_path.stat().st_mtime
thumb_date = thumb_path.stat().st_mtime
return image_date <= thumb_date
def resize_image(image_path, width, height, background='#000000', ignore_aspect_ratio=False):
"""
Resize an image to fit on the current screen.
DO NOT REMOVE THE DEFAULT BACKGROUND VALUE!
:param image_path: The path to the image to resize.
:param width: The new image width.
:param height: The new image height.
:param background: The background colour. Defaults to black.
"""
log.debug('resize_image - start')
reader = QtGui.QImageReader(image_path)
# The image's ratio.
image_ratio = reader.size().width() / reader.size().height()
resize_ratio = width / height
# Figure out the size we want to resize the image to (keep aspect ratio).
if image_ratio == resize_ratio or ignore_aspect_ratio:
size = QtCore.QSize(width, height)
elif image_ratio < resize_ratio:
# Use the image's height as reference for the new size.
size = QtCore.QSize(image_ratio * height, height)
else:
# Use the image's width as reference for the new size.
size = QtCore.QSize(width, 1 / (image_ratio / width))
reader.setScaledSize(size)
preview = reader.read()
if image_ratio == resize_ratio:
# We neither need to centre the image nor add "bars" to the image.
return preview
real_width = preview.width()
real_height = preview.height()
# and move it to the centre of the preview space
new_image = QtGui.QImage(width, height, QtGui.QImage.Format_ARGB32_Premultiplied)
painter = QtGui.QPainter(new_image)
painter.fillRect(new_image.rect(), QtGui.QColor(background))
painter.drawImage((width - real_width) // 2, (height - real_height) // 2, preview)
return new_image
def check_item_selected(list_widget, message):
"""
Check if a list item is selected so an action may be performed on it
:param list_widget: The list to check for selected items
:param message: The message to give the user if no item is selected
"""
if not list_widget.selectedIndexes():
QtWidgets.QMessageBox.information(list_widget.parent(),
translate('OpenLP.MediaManagerItem', 'No Items Selected'), message)
return False
return True
def create_separated_list(string_list):
"""
Returns a string that represents a join of a list of strings with a localized separator.
Localized separation will be done via the translate() function by the translators.
:param string_list: List of unicode strings
:return: Formatted string
"""
list_length = len(string_list)
if list_length == 1:
list_to_string = string_list[0]
elif list_length == 2:
list_to_string = translate('OpenLP.core.lib', '{one} and {two}').format(one=string_list[0], two=string_list[1])
elif list_length > 2:
list_to_string = translate('OpenLP.core.lib', '{first} and {last}').format(first=', '.join(string_list[:-1]),
last=string_list[-1])
else:
list_to_string = ''
return list_to_string
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