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# Copyright (C) 2023 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtCore import Slot
from PySide6.QtGraphs import QBarDataProxy, QBarDataItem
class VariantBarDataProxy(QBarDataProxy):
def __init__(self):
super().__init__()
self._dataSet = None
self._mapping = None
def setDataSet(self, newSet):
if self._dataSet:
self._dataSet.itemsAdded.disconnect(self.handleItemsAdded)
self._dataSet.dataCleared.disconnect(self.handleDataCleared)
self._dataSet = newSet
if self._dataSet:
self._dataSet.itemsAdded.connect(self.handleItemsAdded)
self._dataSet.dataCleared.connect(self.handleDataCleared)
self.resolveDataSet()
def dataSet(self):
return self._dataSet.data()
# Map key (row, column, value) to value index in data item (VariantItem).
# Doesn't gain ownership of mapping, but does connect to it to listen for
# mapping changes. Modifying mapping that is set to proxy will trigger
# dataset re-resolving.
def setMapping(self, mapping):
if self._mapping:
self._mapping.mappingChanged.disconnect(self.handleMappingChanged)
self._mapping = mapping
if self._mapping:
self._mapping.mappingChanged.connect(self.handleMappingChanged)
self.resolveDataSet()
def mapping(self):
return self._mapping.data()
@Slot(int, int)
def handleItemsAdded(self, index, count):
# Resolve new items
self.resolveDataSet()
@Slot()
def handleDataCleared(self):
# Data cleared, reset array
self.resetArray(None)
@Slot()
def handleMappingChanged(self):
self.resolveDataSet()
# Resolve entire dataset into QBarDataArray.
def resolveDataSet(self):
# If we have no data or mapping, or the categories are not defined,
# simply clear the array
if (not self._dataSet or not self._mapping
or not self._mapping.rowCategories()
or not self._mapping.columnCategories()):
self.resetArray()
return
itemList = self._dataSet.itemList()
rowIndex = self._mapping.rowIndex()
columnIndex = self._mapping.columnIndex()
valueIndex = self._mapping.valueIndex()
rowList = self._mapping.rowCategories()
columnList = self._mapping.columnCategories()
# Sort values into rows and columns
itemValueMap = {}
for item in itemList:
key = str(item[rowIndex])
v = itemValueMap.get(key)
if not v:
v = {}
itemValueMap[key] = v
v[str(item[columnIndex])] = float(item[valueIndex])
# Create a new data array in format the parent class understands
newProxyArray = []
for rowKey in rowList:
newProxyRow = []
for i in range(0, len(columnList)):
item = QBarDataItem(itemValueMap[rowKey][columnList[i]])
newProxyRow.append(item)
newProxyArray.append(newProxyRow)
# Finally, reset the data array in the parent class
self.resetArray(newProxyArray)
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