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#!/usr/bin/env python3
#****************************************************************************
# fontset.py, provides storage/retrieval and a dialog for custom fonts
#
# ConvertAll, a units conversion program
# Copyright (C) 2019, Douglas W. Bell
#
# This is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License, either Version 2 or any later
# version. This program is distributed in the hope that it will be useful,
# but WITTHOUT ANY WARRANTY. See the included LICENSE file for details.
#*****************************************************************************
from PyQt5.QtCore import (QSize, Qt)
from PyQt5.QtGui import (QFontDatabase, QFontInfo, QIntValidator)
from PyQt5.QtWidgets import (QAbstractItemView, QCheckBox, QDialog,
QGridLayout, QGroupBox, QHBoxLayout, QLabel,
QLineEdit, QListWidget, QPushButton, QVBoxLayout)
class CustomFontDialog(QDialog):
"""Dialog for selecting a custom font.
"""
def __init__(self, sysFont, currentFont=None, parent=None):
"""Create a font customization dialog.
"""
super().__init__(parent)
self.setWindowFlags(Qt.Dialog | Qt.WindowTitleHint |
Qt.WindowCloseButtonHint)
self.setWindowTitle(_('Customize Font'))
self.sysFont = sysFont
self.currentFont = currentFont
topLayout = QVBoxLayout(self)
self.setLayout(topLayout)
defaultBox = QGroupBox(_('Default Font'))
topLayout.addWidget(defaultBox)
defaultLayout = QVBoxLayout(defaultBox)
self.defaultCheck = QCheckBox(_('&Use system default font'))
defaultLayout.addWidget(self.defaultCheck)
self.defaultCheck.setChecked(self.currentFont == None)
self.defaultCheck.clicked.connect(self.setFontSelectAvail)
self.fontBox = QGroupBox(_('Select Font'))
topLayout.addWidget(self.fontBox)
fontLayout = QGridLayout(self.fontBox)
spacing = fontLayout.spacing()
fontLayout.setSpacing(0)
label = QLabel(_('&Font'))
fontLayout.addWidget(label, 0, 0)
label.setIndent(2)
self.familyEdit = QLineEdit()
fontLayout.addWidget(self.familyEdit, 1, 0)
self.familyEdit.setReadOnly(True)
self.familyList = SmallListWidget()
fontLayout.addWidget(self.familyList, 2, 0)
label.setBuddy(self.familyList)
self.familyEdit.setFocusProxy(self.familyList)
fontLayout.setColumnMinimumWidth(1, spacing)
families = [family for family in QFontDatabase().families()]
families.sort(key=str.lower)
self.familyList.addItems(families)
self.familyList.currentItemChanged.connect(self.updateFamily)
label = QLabel(_('Font st&yle'))
fontLayout.addWidget(label, 0, 2)
label.setIndent(2)
self.styleEdit = QLineEdit()
fontLayout.addWidget(self.styleEdit, 1, 2)
self.styleEdit.setReadOnly(True)
self.styleList = SmallListWidget()
fontLayout.addWidget(self.styleList, 2, 2)
label.setBuddy(self.styleList)
self.styleEdit.setFocusProxy(self.styleList)
fontLayout.setColumnMinimumWidth(3, spacing)
self.styleList.currentItemChanged.connect(self.updateStyle)
label = QLabel(_('Si&ze'))
fontLayout.addWidget(label, 0, 4)
label.setIndent(2)
self.sizeEdit = QLineEdit()
fontLayout.addWidget(self.sizeEdit, 1, 4)
self.sizeEdit.setFocusPolicy(Qt.ClickFocus)
validator = QIntValidator(1, 512, self)
self.sizeEdit.setValidator(validator)
self.sizeList = SmallListWidget()
fontLayout.addWidget(self.sizeList, 2, 4)
label.setBuddy(self.sizeList)
self.sizeList.currentItemChanged.connect(self.updateSize)
fontLayout.setColumnStretch(0, 30)
fontLayout.setColumnStretch(2, 25)
fontLayout.setColumnStretch(4, 10)
sampleBox = QGroupBox(_('Sample'))
topLayout.addWidget(sampleBox)
sampleLayout = QVBoxLayout(sampleBox)
self.sampleEdit = QLineEdit()
sampleLayout.addWidget(self.sampleEdit)
self.sampleEdit.setAlignment(Qt.AlignCenter)
self.sampleEdit.setText(_('AaBbCcDdEeFfGg...TtUuVvWvXxYyZz'))
self.sampleEdit.setFixedHeight(self.sampleEdit.sizeHint().height() * 2)
ctrlLayout = QHBoxLayout()
topLayout.addLayout(ctrlLayout)
ctrlLayout.addStretch()
self.okButton = QPushButton(_('&OK'))
ctrlLayout.addWidget(self.okButton)
self.okButton.clicked.connect(self.accept)
cancelButton = QPushButton(_('&Cancel'))
ctrlLayout.addWidget(cancelButton)
cancelButton.clicked.connect(self.reject)
self.setFontSelectAvail()
def setFontSelectAvail(self):
"""Disable font selection if default font is checked.
Also set the controls with the current or default fonts.
"""
if self.currentFont and not self.defaultCheck.isChecked():
self.setFont(self.currentFont)
else:
self.setFont(self.sysFont)
self.fontBox.setEnabled(not self.defaultCheck.isChecked())
def setFont(self, font):
"""Set the font selector to the given font.
Arguments:
font -- the QFont to set.
"""
fontInfo = QFontInfo(font)
family = fontInfo.family()
matches = self.familyList.findItems(family, Qt.MatchExactly)
if matches:
self.familyList.setCurrentItem(matches[0])
self.familyList.scrollToItem(matches[0],
QAbstractItemView.PositionAtTop)
style = QFontDatabase().styleString(fontInfo)
matches = self.styleList.findItems(style, Qt.MatchExactly)
if matches:
self.styleList.setCurrentItem(matches[0])
self.styleList.scrollToItem(matches[0])
else:
self.styleList.setCurrentRow(0)
self.styleList.scrollToItem(self.styleList.currentItem())
size = repr(fontInfo.pointSize())
matches = self.sizeList.findItems(size, Qt.MatchExactly)
if matches:
self.sizeList.setCurrentItem(matches[0])
self.sizeList.scrollToItem(matches[0])
def updateFamily(self, currentItem, previousItem):
"""Update the family edit box and adjust the style and size options.
Arguments:
currentItem -- the new list widget family item
previousItem -- the previous list widget item
"""
family = currentItem.text()
self.familyEdit.setText(family)
if self.familyEdit.hasFocus():
self.familyEdit.selectAll()
prevStyle = self.styleEdit.text()
prevSize = self.sizeEdit.text()
fontDb = QFontDatabase()
styles = [style for style in fontDb.styles(family)]
self.styleList.clear()
self.styleList.addItems(styles)
if prevStyle:
try:
num = styles.index(prevStyle)
except ValueError:
num = 0
self.styleList.setCurrentRow(num)
self.styleList.scrollToItem(self.styleList.currentItem())
sizes = [repr(size) for size in fontDb.pointSizes(family)]
self.sizeList.clear()
self.sizeList.addItems(sizes)
if prevSize:
try:
num = sizes.index(prevSize)
except ValueError:
num = 0
self.sizeList.setCurrentRow(num)
self.sizeList.scrollToItem(self.sizeList.currentItem())
self.updateSample()
def updateStyle(self, currentItem, previousItem):
"""Update the style edit box.
Arguments:
currentItem -- the new list widget style item
previousItem -- the previous list widget item
"""
if currentItem:
style = currentItem.text()
self.styleEdit.setText(style)
if self.styleEdit.hasFocus():
self.styleEdit.selectAll()
self.updateSample()
def updateSize(self, currentItem, previousItem):
"""Update the size edit box.
Arguments:
currentItem -- the new list widget size item
previousItem -- the previous list widget item
"""
if currentItem:
size = currentItem.text()
self.sizeEdit.setText(size)
if self.sizeEdit.hasFocus():
self.sizeEdit.selectAll()
self.updateSample()
def updateSample(self):
"""Update the font sample edit font.
"""
font = self.readFont()
if font:
self.sampleEdit.setFont(font)
def readFont(self):
"""Return the selected font or None.
"""
family = self.familyEdit.text()
style = self.styleEdit.text()
size = self.sizeEdit.text()
if family and style and size:
return QFontDatabase().font(family, style, int(size))
return None
def resultingFont(self):
"""Return the selected font or None if system font.
"""
if self.defaultCheck.isChecked():
return None
return self.readFont()
class SmallListWidget(QListWidget):
"""ListWidget with a smaller size hint.
"""
def __init__(self, parent=None):
"""Initialize the widget.
Arguments:
parent -- the parent, if given
"""
super().__init__(parent)
def sizeHint(self):
"""Return smaller width.
"""
itemHeight = self.visualItemRect(self.item(0)).height()
return QSize(100, itemHeight * 6)
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