That's the correct code at the moment. However I've realised that it's
very easy to add support for Python iteration.
Phil
On 29/08/2023 19:41, Charles wrote:
> Apparently the problem is with using python iteration over the
> QModelRoleDataSpan object (does it supports python iteration)?
>> This code instead works fine
>> def multiData(self, index, roleDataSpan):
> item = self._items[index.row()]
> itemData = self._itemData(item, index.column())
> for i in range(roleDataSpan.length()):
> roleData = roleDataSpan[i]
> if roleValue := itemData.get(roleData.role()):
> roleData.setData(roleValue)
> else:
> roleData.clearData()
>> On Tue, Aug 29, 2023 at 8:17 PM Charles <peacech at gmail.com> wrote:
>>> Hi Phil, here is an example standalone code
>>>> import sys
>> from dataclasses import dataclass
>>>> from PyQt6.QtCore import QAbstractTableModel, Qt
>> from PyQt6.QtWidgets import QApplication, QMainWindow, QTableView
>>>>>> @dataclass
>> class Item:
>> name: str
>> weight: int
>>>>>> class Model(QAbstractTableModel):
>> def __init__(self, parent=None):
>> super().__init__(parent)
>> self._items = [Item('A', 10), ('B', 11)]
>>>> def rowCount(self, index):
>> return len(self._items)
>>>> def columnCount(self, index):
>> return 2
>>>> def _itemData(self, item, column):
>> match column:
>> case 0:
>> return {Qt.ItemDataRole.DisplayRole: item.name}
>> case 1:
>> return {Qt.ItemDataRole.DisplayRole: str(item.weight)}
>>>> # crash
>> def multiData(self, index, roleDataSpan):
>> item = self._items[index.row()]
>> itemData = self._itemData(item, index.column())
>> for roleData in roleDataSpan:
>> if roleValue := itemData.get(roleData.role()):
>> if existingData := roleData.data():
>> existingData.setValue(roleValue)
>> else:
>> roleData.setData(roleValue)
>> else:
>> roleData.clearData()
>>>> # works
>> # def multiData(self, index, roleDataSpan):
>> # pass
>>>>>> class Widget(QTableView):
>> def __init__(self, parent=None):
>> super().__init__(parent)
>> self.setModel(Model(self))
>>>>>> class Window(QMainWindow):
>> def __init__(self):
>> super().__init__()
>> self.setCentralWidget(Widget(self))
>>>>>> app = QApplication(sys.argv)
>> win = Window()
>> win.show()
>> app.exec()
>>>> On Tue, Aug 29, 2023 at 7:59 PM Phil Thompson
>> <phil at riverbankcomputing.com>
>> wrote:
>>>>> Can you create a short complete example I can use?
>>>>>> Thanks,
>>> Phil
>>>>>> On 29/08/2023 13:40, Charles wrote:
>>> > I tried using multiData with this code snippet but it seems to crash
>>> > when
>>> > setting roleData.setData(...). Also I notice that the role values might
>>> > be
>>> > negative. (Btw, ic is icecream print).
>>> >
>>> > def _itemData(self, item, col):
>>> > match col.name:
>>> > case 'code':
>>> > return {
>>> > Qt.DisplayRole: item.code,
>>> > }
>>> > case 'earnings_chg':
>>> > return {
>>> > Qt.DisplayRole: f'{item.earnings_chg}%',
>>> > }
>>> > case 'time':
>>> > return {
>>> > Qt.DisplayRole: item.time.strftime('%Y-%m-%d'),
>>> > }
>>> > case 'earnings':
>>> > return {
>>> > Qt.DisplayRole: formatMoney(item.earnings),
>>> > }
>>> >
>>> > def multiData(self, index, roleDataSpan):
>>> > ic(index, roleDataSpan)
>>> > item = self._items[index.row()]
>>> > col = self.COLUMNS[index.column()]
>>> > itemData = self._itemData(item, col)
>>> > for roleData in roleDataSpan:
>>> > role = roleData.role()
>>> > ic(role)
>>> > if value := itemData.get(role):
>>> > roleData.setData(value)
>>> > else:
>>> > match role:
>>> > case Qt.FontRole:
>>> > roleData.setData(style.TABLE_FONT)
>>> > case Qt.TextAlignmentRole:
>>> > align = col.align
>>> > if align == 'C':
>>> > roleData.setData(Qt.AlignCenter)
>>> > elif align == 'R':
>>> > roleData.setData(Qt.AlignVCenter |
>>> > Qt.AlignRight)
>>> >
>>> > ic| earnings.py:66 in multiData()
>>> > index: <PyQt6.QtCore.QModelIndex object at 0x000001D17B77D000>
>>> > roleDataSpan: <PyQt6.QtCore.QModelRoleDataSpan object at
>>> > 0x000001D17B77D4D0>
>>> > ic| earnings.py:72 in multiData()- role: 6
>>> > ic| earnings.py:72 in multiData()- role: 7
>>> > ic| earnings.py:72 in multiData()- role: 9
>>> > ic| earnings.py:72 in multiData()- role: 10
>>> > ic| earnings.py:72 in multiData()- role: 1
>>> > ic| earnings.py:72 in multiData()- role: 0
>>> > ic| earnings.py:72 in multiData()- role: 8
>>> > ic| earnings.py:72 in multiData()- role: -948493808
>>> > ic| earnings.py:72 in multiData()- role: 1897532384
>>> > ic| earnings.py:72 in multiData()- role: 1897532384
>>> > ic| earnings.py:72 in multiData()- role: 2033014364
>>> > ic| earnings.py:72 in multiData()- role: 2
>>> > ic| earnings.py:72 in multiData()- role: 16777216
>>> > ic| earnings.py:72 in multiData()- role: 1893028080
>>> > ic| earnings.py:72 in multiData()- role: 1897532384
>>> > ic| earnings.py:72 in multiData()- role: 1897532384
>>> > ic| earnings.py:72 in multiData()- role: 2033014458
>>> > ic| earnings.py:72 in multiData()- role: 2
>>> > ic| earnings.py:72 in multiData()- role: 2033021932
>>> > ic| earnings.py:72 in multiData()- role: 3
>>> > ic| earnings.py:72 in multiData()- role: 524288
>>> > ic| earnings.py:72 in multiData()- role: 1893028080
>>> > ic| earnings.py:72 in multiData()- role: 1897532384
>>> > ic| earnings.py:72 in multiData()- role: 1897532384
>>> > ic| earnings.py:72 in multiData()- role: 2033022038
>>> > ic| earnings.py:72 in multiData()- role: 1
>>> > ic| earnings.py:72 in multiData()- role: 22528
>>> > ic| earnings.py:72 in multiData()- role: 1893028080
>>> >
>>> > On Sun, Aug 27, 2023 at 10:45 PM Phil Thompson
>>> > <phil at riverbankcomputing.com>
>>> > wrote:
>>> >
>>> >> On 14/08/2023 16:21, Jakub Fránek wrote:
>>> >> > Hello
>>> >> >
>>> >> > I am working on a PyQt app that features a large QTableView driven
>>> by a
>>> >> > custom QAbstractTableModel implementation. Profiling shows that even
>>> >> > after
>>> >> > heavy optimization, the program spends a lot of time calling
>>> >> > QAbstractItemModel.data method.
>>> >> >
>>> >> > I think that QAbstractItemModel.multiData method could improve the
>>> >> > performance considerably, however it seems that PyQt does not support
>>> >> > this
>>> >> > binding (since it does not even support QModelRoleDataSpan).
>>> >> >
>>> >> > My question is: is there any plan of supporting
>>> >> > QAbstractItemModel.multiData method in the future? If there is no
>>> such
>>> >> > plan
>>> >> > yet, I would like to cast my vote and humbly request this binding in
>>> >> > some
>>> >> > future version of PyQt.
>>> >>
>>> >> multiData() and QModelRoleSpan are implemented in the next snapshot -
>>> >> please test.
>>> >>
>>> >> Phil
>>> >>
>>>>>
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‘She has never mentioned her father to me. Was he—well, the sort of man whom the County Club would not have blackballed?’ "We walked by the side of our teams or behind the wagons, we slept on the ground at night, we did our own cooking, we washed our knives by sticking them into the ground rapidly a few times, and we washed our plates with sand and wisps of grass. When we stopped, we arranged our wagons in a circle, and thus formed a 'corral,' or yard, where we drove our oxen to yoke them up. And the corral was often very useful as a fort, or camp, for defending ourselves against the Indians. Do you see that little hollow down there?" he asked, pointing to a depression in the ground a short distance to the right of the train. "Well, in that hollow our wagon-train was kept three days and nights by the Indians. Three days and nights they stayed around, and made several attacks. Two of our men were killed and three were wounded by their arrows, and others had narrow escapes. One arrow hit me on the throat, but I was saved by the knot of my neckerchief, and the point only tore the skin a little. Since that time I have always had a fondness for large neckties. I don't know how many of the Indians we killed, as they carried off their dead and wounded, to save them from being scalped. Next to getting the scalps of their enemies, the most important thing with the Indians is to save their own. We had several fights during our journey, but that one was the worst. Once a little party of us were surrounded in a small 'wallow,' and had a tough time to defend ourselves successfully. Luckily for us, the Indians had no fire-arms then, and their bows and arrows were no match for our rifles. Nowadays they are well armed, but there are[Pg 41] not so many of them, and they are not inclined to trouble the railway trains. They used to do a great deal of mischief in the old times, and many a poor fellow has been killed by them." As dusk came on nearly the whole population of Maastricht, with all their temporary guests, formed an endless procession and went to invoke God's mercy by the Virgin Mary's intercession. They went to Our Lady's Church, in which stands the miraculous statue of Sancta Maria Stella Maris. The procession filled all the principal streets and squares of the town. I took my stand at the corner of the Vrijthof, where all marched past me, men, women, and children, all praying aloud, with loud voices beseeching: "Our Lady, Star of the Sea, pray for us ... pray for us ... pray for us ...!" It had not occurred to her for some hours after Mrs. Campbell had told her of Landor's death that she was free now to give herself to Cairness. She had gasped, indeed, when she did remember it, and had put the thought away, angrily and self-reproachfully. But it returned now, and she felt that she might cling to it. She had been grateful, and she had been faithful, too.[Pg 286] She remembered only that Landor had been kind to her, and forgot that for the last two years she had borne with much harsh coldness, and with a sort of contempt which she felt in her unanalyzing mind to have been entirely unmerited. Gradually she raised herself until she sat quite erect by the side of the mound, the old exultation of her half-wild girlhood shining in her face as she planned the future, which only a few minutes before had seemed so hopeless. After he had gloated over Sergeant Ramsey, Shorty got his men into the road ready to start. Si placed himself in front of the squad and deliberately loaded his musket in their sight. Shorty took his place in the rear, and gave out: The groups about each gun thinned out, as the shrieking fragments of shell mowed down man after man, but the rapidity of the fire did not slacken in the least. One of the Lieutenants turned and motioned with his saber to the riders seated on their horses in the line of limbers under the cover of the slope. One rider sprang from each team and ran up to take the place of men who had fallen. "As long as there's men and women in the world, the men 'ull be top and the women bottom." Then, in the house, the little girls were useful. Mrs. Backfield was not so energetic as she used to be. She had never been a robust woman, and though her husband's care had kept her well and strong, her frame was not equal to Reuben's demands; after fourteen years' hard labour, she suffered from rheumatism, which though seldom acute, was inclined to make her stiff and slow. It was here that Caro and Tilly came in, and Reuben began to appreciate his girls. After all, girls were needed in a house—and as for young men and marriage, their father could easily see that such follies did not spoil their usefulness or take them from him. Caro and Tilly helped their grandmother in all sorts of ways—they dusted, they watched pots, they shelled peas and peeled potatoes, they darned house-linen, they could even make a bed between them. HoME一级毛片视频免费公开
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