87 lines
No EOL
2.8 KiB
Markdown
87 lines
No EOL
2.8 KiB
Markdown
# QListView
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## 1. Custom Widget Item
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[Run CustomWidgetItem.py](CustomWidgetItem.py)
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use `setIndexWidget(QModelIndex, QWidget)` to set custom `QWidget`
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## 2. Custom Widget Sort Item
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[Run CustomWidgetSortItem.py](CustomWidgetSortItem.py)
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1. set QListView proxy model, use `QSortFilterProxyModel`
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2. rewrite `lessThan` method to sort
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## 3, Custom Role And Sort
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[Run SortItemByRole.py](SortItemByRole.py)
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Demand:
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1. 5 categories(Tang, Song, Yuan, Ming, Qing) and Unclassified
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2. selected Tang, the result is Tang, Song, Yuan, Ming, Qing, Unclassified
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3. selected Song, the result is Song, Tang, Yuan, Ming, Qing, Unclassified
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4. selected Yuan, the result is Yuan, Tang, Song, Ming, Qing, Unclassified
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5. Cancel sorting then Restore, like: Unclassified, Tang, Tang, Ming, Qing, Unclassified, Song, Yuan, Unclassified
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Method:
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1. define `IdRole = Qt.UserRole + 1` Used to restore default sort
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2. define `ClassifyRole = Qt.UserRole + 2` Used for sorting by sorting number
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3. define 5 classify id
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```python
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NameDict = {
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'Tang': ['Tang', 0],
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'Song': ['Song', 1],
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'Yuan': ['Yuan', 2],
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'Ming': ['Ming', 3],
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'Qing': ['Qing', 4],
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}
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IndexDict = {
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0: 'Tang',
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1: 'Song',
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2: 'Yuan',
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3: 'Ming',
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4: 'Qing',
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}
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```
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4. item `setData(id, IdRole)` Used to restore default sort
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5. item `setData(cid, ClassifyRole)` Used to record classification
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6. inherit `QSortFilterProxyModel` and add `setSortIndex(self, index)` mthod, The purpose is to keep some classify always top
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```python
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def setSortIndex(self, index):
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self._topIndex = index
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```
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7. inherit `QSortFilterProxyModel` and rewrite `lessThan` mthod, if classify id is equal to top id, then modify it -1
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```python
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if self.sortRole() == ClassifyRole and \
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source_left.column() == self.sortColumn() and \
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source_right.column() == self.sortColumn():
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# get classify id
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leftIndex = source_left.data(ClassifyRole)
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rightIndex = source_right.data(ClassifyRole)
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# AscendingOrder
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if self.sortOrder() == Qt.AscendingOrder:
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# keep always top
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if leftIndex == self._topIndex:
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leftIndex = -1
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if rightIndex == self._topIndex:
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rightIndex = -1
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return leftIndex < rightIndex
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```
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8. restore default sort
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```python
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self.fmodel.setSortRole(IdRole)
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self.fmodel.sort(0)
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```
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9. sort by classify id, must reset `setSortRole` to other
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```python
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self.fmodel.setSortIndex(1)
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self.fmodel.setSortRole(IdRole)
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self.fmodel.setSortRole(ClassifyRole)
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self.fmodel.sort(0)
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```
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