@ Maurizio
Thank you so much for clearing the nodal in my brain. Beautiful music
you make, btw.
Regards Hans
Here the link to the SO Question mentioned in the mail below:
https://stackoverflow.com/questions/46515179/subclassing-of-widgets-which-are-loaded-by-uic-loadui
After many years of playing around with PyQt I've found "my" optimal
setup for a good environment allowing simpler coding and integration
with .ui files created within Designer. I'd also like to add that the
documentation about this is not always clear, and it sometimes "makes
sense" only whenever you've completely understood how Qt, PyQt and the
whole GUI environment works.
Let me share how I usually work.
- All main windows (QMainWindow and QDialog, but QWidget too) are only
saved to .ui files, and I load their ui through loadUi(). While
"building" with pyuic might be better for various reasons (paths,
mainly), working with plain raw ui files avoids confusion: sometimes
(a lot of times, in my case, it can be simple fatigue or distraction
after hours of coding) you edit a widget in Designer and then you
forget that you've to recreate the python ui file, then after minutes
of trying to understand why something is not working as it should, you
remember... This is annoying, and makes you lose a *lot* of time.
- Due to the previous point, all windows that use an .ui file only
have to inherit from their base Qt class; the only drawback is that
you've to be careful to never use object names that might conflict
with python naming standards and QWidget/QObject property/function
names: for example, "style", "cursor" or "layout". The huge advantage
is that you don't need to refer to the "self.ui", and everything is
transparently available as a property/method of the main widget class.
- All custom widgets of a GUI loaded from an .ui file that require
some sort of customization that is not a public function or cannot be
easily "fixed" through an eventFilter are "promoted widgets".
The last point is probably the one that creates more confusion above
everything else. But, while it might seem an annoying thing to do,
once you've got the hand of it, it's fairly easy to implement a widget
just by subclassing only what you need.
Let's assume you've a QMainWindow with a QListView for which you only
need to print out drop events, and let's assume you'll use
"myprogram.py" as the file for your python program.
- Create a QMainWindow in Designer with a list view, and ensure that
the dragDropMode is set to DropOnly or DragDrop.
- Right click on the view and select "Promote to..."
- Type the class name, let's say "MyListView", and in the "Header
file" field type "myprogram" (the name you'd use if you were to import
the main python code file)
- Click "Add", then "Promote"
- save the ui file in the same directory the myprogram.py is
- And that's the only code you'll need, avoiding any eventFilter or
whatsoever:
class MyListView(QtWidgets.QListView):
聽 聽 def dragEnterEvent(self, event):
聽 聽 聽 聽 # to get a dropEvent,聽both the dragEnterEvent and
聽 聽 聽 聽 # dragMoveEvent (which is fired right after) have to聽
聽 聽 聽 聽 # be accepted!
聽 聽 聽 聽 event.accept()
聽 聽 def dragMoveEvent(self, event):
聽 聽 聽 聽 event.accept()
聽 聽 def dropEvent(self, event):
聽 聽 聽 聽 print('Something has been dropped in here!')
class Window(QtWidgets.QMainWindow):
聽 聽 def __init__(self):
聽 聽 聽 聽 QtWidgets.QWidget.__init__(self)
聽 聽 聽 聽 loadUi('mywindow.ui', self)
聽 聽 聽 聽 # the list view (and its properties/methods) is available
as聽
聽 聽 聽 聽 # a direct attribute of the main class
聽 聽 聽
聽聽self.listView.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
Still considering the small naming "drawbacks" and path issues listed
before, this allows you to have some clean code, get simple and
logical references to all widgets and still implement custom widgets
in an easy way.
For example, you can add a QPushButton and implement its paintEvent
only, or a QLabel and allow it to react to mousePressEvent by sending
a custom signal.
A couple of considerations:
- Whenever you'll use a promoted widget, PyQt will "silently import"
the file set as the "header"; if you've some processing in those
files, they will be executed everytime an ui (and its promoted widget)
is loaded.
- Paths: loadUi() doesn't behave according to the path of the running
program, but from where it's loaded. I'm using cxFreeze to build
Windows and MacOS binaries for some projects and I had to create my
own loadUi function that builds and returns the ui object (I don't
need the actual ui object, I could've ignored that, but that's not the
point):
def loadUi(uiPath, widget):
聽 聽 current = path.dirname(path.abspath(__file__))
聽 聽 #fix for cx_freeze
聽 聽 if current.endswith('\\library.zip\\myproject'):
聽 聽 聽 聽 current = current.replace('\\library.zip', '')
聽 聽 elif current.endswith('/library.zip/myproject'):
聽 聽 聽 聽 current = current.replace('/library.zip', '')
聽 聽 return uic.loadUi(path.join(current, uiPath), widget)
While you can ignore the ifs if you're not using similar building
systems, the path relocation is necessary, since uic will try to load
the file from the path the program is ran from, which is not good.
Hope this helps :-)
Maurizio
--聽
脠 difficile avere una convinzione precisa quando si parla delle
ragioni del cuore. - "Sostiene Pereira", Antonio Tabucchi
http://www.jidesk.net [1]
Links:
------
[1] http://www.jidesk.net/
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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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