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#****************************************************************************
# unitlistview.py, provides a list view of available units
#
# ConvertAll, a units conversion program
# Copyright (C) 2016, 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 (pyqtSignal, Qt, QItemSelectionModel)
from PyQt5.QtGui import QPalette
from PyQt5.QtWidgets import (QAbstractItemView, QApplication, QTreeWidget,
QTreeWidgetItem)
import re
class UnitListView(QTreeWidget):
"""ListView of units available.
"""
unitChanged = pyqtSignal()
haveCurrentUnit = pyqtSignal(bool, bool)
# pass True if unitEdit active, then True if have unit text, o/w False
def __init__(self, unitData, parent=None):
super().__init__(parent)
self.unitData = unitData
self.highlightNum = 0
self.typeFilter = ''
self.setRootIsDecorated(False)
self.setColumnCount(3)
self.setHeaderLabels([_('Unit Name'), _('Unit Type'), _('Comments')])
self.header().setStretchLastSection(False)
self.header().setSortIndicatorShown(True)
self.header().setSectionsClickable(True)
self.header().setSortIndicator(0, Qt.AscendingOrder)
self.header().sectionClicked.connect(self.changeSort)
self.itemSelectionChanged.connect(self.replaceUnit)
self.loadUnits()
def loadUnits(self):
"""Load unit items.
"""
self.clear()
for unit in self.unitData.values():
UnitListViewItem(unit, self)
for col in range(3):
self.resizeColumnToContents(col)
def updateFiltering(self, focusProxy=None):
"""Update list after change to line editor.
Set focus proxy to line editor if given (no change if None).
"""
if focusProxy:
self.setFocusProxy(focusProxy)
if self.focusProxy():
currentUnit = self.focusProxy().unitGroup.currentUnit()
else:
currentUnit = None
self.blockSignals(True)
self.clear()
if currentUnit and currentUnit.unitName:
for unit in self.unitData.partialMatches(currentUnit.unitName):
if not self.typeFilter or unit.typeName == self.typeFilter:
UnitListViewItem(unit, self)
else:
unit.viewLink = None
if currentUnit.datum and currentUnit.datum.viewLink:
self.setCurrentItem(currentUnit.datum.viewLink)
self.highlightNum = self.indexOfTopLevelItem(currentUnit.
datum.viewLink)
else:
for unit in self.unitData.values():
if not self.typeFilter or unit.typeName == self.typeFilter:
UnitListViewItem(unit, self)
else:
unit.viewLink = None
if (not self.currentItem() and self.focusProxy() and
self.topLevelItemCount()):
self.setHighlight(0)
self.blockSignals(False)
self.haveCurrentUnit.emit(bool(self.focusProxy()),
bool(currentUnit and currentUnit.unitName))
def resetFiltering(self):
"""Clear the focus proxy and remove search filtering.
"""
if self.focusProxy():
self.setFocusProxy(None)
self.updateFiltering()
def replaceUnit(self):
"""Replace current unit in response to a selection change.
"""
selectList = self.selectedItems()
if selectList:
selection = selectList[-1]
if self.focusProxy():
self.focusProxy().unitGroup.replaceCurrent(selection.unit)
self.unitChanged.emit() # update unitEdit
self.updateFiltering()
else:
self.setCurrentItem(None)
self.setHighlight(self.indexOfTopLevelItem(selection))
def addUnitText(self):
"""Add exponent or operator text from push button to unit group.
Autocomplete a highlighted unit if not selected.
"""
if self.focusProxy():
button = self.sender()
text = re.match(r'.*\((.*?)\)$', button.text()).group(1)
if not self.selectedItems():
item = self.topLevelItem(self.highlightNum)
if item:
self.setCurrentItem(item)
if text.startswith('^'):
self.focusProxy().unitGroup.changeExp(int(text[1:]))
else:
self.focusProxy().unitGroup.addOper(text == '*')
self.updateFiltering()
self.unitChanged.emit()
def clearUnitText(self):
"""Remove all unit text.
"""
if self.focusProxy():
self.focusProxy().unitGroup.clearUnit()
self.unitChanged.emit()
self.updateFiltering()
def setHighlight(self, num):
"""Set the item at row num to be highlighted.
"""
self.clearHighlight()
item = self.topLevelItem(num)
if item:
if [item] != self.selectedItems():
pal = QApplication.palette(self)
brush = pal.brush(QPalette.Highlight)
for col in range(3):
item.setForeground(col, brush)
self.scrollToItem(item)
self.highlightNum = num
def clearHighlight(self):
"""Clear the highlight from currently highlighted item.
"""
item = self.topLevelItem(self.highlightNum)
if item and [item] != self.selectedItems():
pal = QApplication.palette(self)
brush = pal.brush(QPalette.Text)
for col in range(3):
item.setForeground(col, brush)
def changeSort(self):
"""Change the sort order based on a header click.
"""
colNum = self.header().sortIndicatorSection()
order = self.header().sortIndicatorOrder() == Qt.AscendingOrder
self.unitData.sortUnits(colNum, order)
self.updateFiltering()
def handleKeyPress(self, key):
"""Handle up/down, page up/down and enter key presses.
"""
if key == Qt.Key_Up:
pos = self.highlightNum - 1
elif key == Qt.Key_Down:
pos = self.highlightNum + 1
elif key == Qt.Key_PageUp:
ht = self.viewport().height()
numVisible = (self.indexOfTopLevelItem(self.itemAt(0, ht)) -
self.indexOfTopLevelItem(self.itemAt(0, 0)))
pos = self.highlightNum - numVisible
elif key == Qt.Key_PageDown:
ht = self.viewport().height()
numVisible = (self.indexOfTopLevelItem(self.itemAt(0, ht)) -
self.indexOfTopLevelItem(self.itemAt(0, 0)))
pos = self.highlightNum + numVisible
elif key in (Qt.Key_Return, Qt.Key_Enter):
item = self.topLevelItem(self.highlightNum)
if item:
self.setCurrentItem(item)
return
else:
return
if pos < 0:
pos = 0
if pos >= self.topLevelItemCount():
pos = self.topLevelItemCount() - 1
self.setHighlight(pos)
def sizeHint(self):
"""Adjust width smaller.
"""
size = super().sizeHint()
size.setWidth(self.viewportSizeHint().width() + 5 +
self.verticalScrollBar().sizeHint().width())
return size
class UnitListViewItem(QTreeWidgetItem):
"""Item in list view, references unit.
"""
def __init__(self, unit, parent=None):
super().__init__(parent)
self.unit = unit
unit.viewLink = self
for colNum in range(3):
self.setText(colNum, unit.columnText(colNum))
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