But no need to set it on your own. I only call QTableView. This is important to me, as I track all calls to the database. There are indeed times when you write a seemingly harmless piece of code which you think is just setting a variable but turns out to actually be accessing the database, just like setSortingEnabled. I have had to track them all down which I did by tracing the actual calls at the MySQL Server side and then see which ones can be avoided.
I do not like the way the otherwise excellent Qt implementation has quite non-obvious, implicit calls to the database when you have no idea it is doing it, especially when you set something in the view.
You can influence the sorting. And you could tell it by a flag that you define to do nothing. But it's quite a hassle if you do it just as a workaround for that.
Plus, where is that documented, please? The "comparison operator" should sort by the "sort column", whatever that is, and the problem is the QTableView has its own idea of what that is.
It all works after QTableView. And if I'm misunderstanding, and you do, you only want to do it after you have done QTableView. Let me write up a new post of what I believe my findings were, and we'll take it from there.
But never mind that. Unfortunately, and undocumented [hmm, it is in 5. This is better, but the problem is that you cannot suppress that second SELECT call, which is a waste, and unacceptable in my code. Which is a nonsense.A QTableView implements a table view that displays items from a model. You can navigate the cells in the table by clicking on a cell with the mouse, or by using the arrow keys. The table has a vertical header that can be obtained using the verticalHeader function, and a horizontal header that is available through the horizontalHeader function.
The height of each row in the table can be found by using rowHeight ; similarly, the width of columns can be found using columnWidth. Since both of these are plain widgets, you can hide either of them using their hide functions.
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Rows and columns can be hidden and shown with hideRowhideColumnshowRowand showColumn. They can be selected with selectRow and selectColumn. The table will show a grid depending on the showGrid property. The items shown in a table view, like those in the other item views, are rendered and edited using standard delegates.
However, for some tasks it is sometimes useful to be able to insert widgets in a table instead.Best radiology learning websites
Widgets are set for particular indexes with the setIndexWidget function, and later retrieved with indexWidget. You can make the cells fill the available space by stretching the last header section. Access the relevant header using horizontalHeader or verticalHeader and set the header's stretchLastSection property.
To distribute the available space according to the space requirement of each column or row, call the view's resizeColumnsToContents or resizeRowsToContents functions. For some specialized forms of tables it is useful to be able to convert between row and column indexes and widget coordinates.
The rowAt function provides the y-coordinate within the view of the specified row; the row index can be used to obtain a corresponding y-coordinate with rowViewportPosition. The columnAt and columnViewportPosition functions provide the equivalent conversion operations between x-coordinates and column indexes.
If this property is true then button in the top-left corner of the table view is enabled. Clicking on this button will select all the cells in the table view. This property holds the style used when drawing the grid see showGrid. If this property is true a grid is drawn for the table; if the property is falseno grid is drawn.
The default value is true.The data of the source model can be sorted in ascending or descending manner by clicking on the header of a column. Moreover, the data can be filtered simultaneously by gravity and density. The planetary data i. In the MainWindow constructor we instantiate and populate the table model. The model is populated with the help of a QList passed to the constructor of the source model. We also instantiate the proxy model and associate it with the source model with the help of the method setSourceModel.
We also create an instance of QTableView and associate it with the proxyModel. Repeated clicking on the header enables to alternate between ascending and descending order.
In createWidgets we create labels and spinboxes that enable to set the minimum gravity and density. We set the gravity step to 2. In createConnections we connect the signals valueChanged double of the filterGravitySpinBox and filterDensitySpinBox, to the slots that update the minimum values for gravity and density in the proxyModel.Duo du jour
The source model for planets is represented by a subclass of QAbstractTableModel with user-defined rowCountcolumnCountdata and headerData. In the constructor we populate the table model with data. The method data decides how the data is presented in the table. In the method, we first check the validity and correct range of an index.
If the index is valid, we create a reference to a planet for a particular index row and display its name in column 0, gravity in column 1 and density in column 2. The text of the 1 st and 2 nd column is aligned to the middle in both directions, the text of the 0 th column is aligned to the left horizontally and to the middle vertically. The method headerData determines how the data is presented in the headers. Since we want the vertical header to return row numbers 1,2, The filtering is implemented in the method filterAcceptsRow method.The QSortFilterProxyModel class provides support for sorting and filtering data passed between another model and a view.
More …. QSortFilterProxyModel can be used for sorting items, filtering out items, or both. The model transforms the structure of a source model by mapping the model indexes it supplies to new indexes, corresponding to different locations, for views to use. This approach allows a given source model to be restructured as far as views are concerned without requiring any transformations on the underlying data, and without duplicating the data in memory. The code to set up the model and the view, without sorting and filtering, would look like this:.
At this point, neither sorting nor filtering is enabled; the original data is displayed in the view. By default, the model dynamically re-sorts and re-filters data whenever the original model changes.
This behavior can be changed by setting the dynamicSortFilter property. For example:. When this feature is on the default is offclicking on a header section sorts the items according to that column.
By clicking repeatedly, the user can alternate between ascending and descending order. Behind the scene, the view calls the sort virtual function on the model to reorder the data in the model. To make your data sortable, you can either implement sort in your model, or use a QSortFilterProxyModel to wrap your model — QSortFilterProxyModel provides a generic sort reimplementation that operates on the sortRole DisplayRole by default of the items and that understands several data types, including intQStringand QDateTime.
For hierarchical models, sorting is applied recursively to all child items. String comparisons are case sensitive by default; this can be changed by setting the sortCaseSensitivity property. Custom sorting behavior is achieved by subclassing QSortFilterProxyModel and reimplementing lessThanwhich is used to compare items.
An alternative approach to sorting is to disable sorting on the view and to impose a certain order to the user. This is done by explicitly calling sort with the desired column and order as arguments on the QSortFilterProxyModel or on the original model if it implements sort. QSortFilterProxyModel can be sorted by column -1, in which case it returns to the sort order of the underlying source model. In addition to sorting, QSortFilterProxyModel can be used to hide items that do not match a certain filter.
The filter is specified using a QRegExp object and is applied to the filterRole DisplayRole by default of each item, for a given column. The QRegExp object can be used to match a regular expression, a wildcard pattern, or a fixed string.
For hierarchical models, the filter is applied recursively to all children. A common use case is to let the user specify the filter regular expression, wildcard pattern, or fixed string in a QLineEdit and to connect the textChanged signal to setFilterRegularExpressionsetFilterWildcardor setFilterFixedString to reapply the filter. Custom filtering behavior can be achieved by reimplementing the filterAcceptsRow and filterAcceptsColumn functions.It turns out the sort method in QAbstractItemModel is not implemented.
So I had to implement it myself. Hence, my previous post, How to sort a table by columns in Python. I'm not sure if this is the best way to implement the sort method, but I couldn't find anything else out there, and this seems to work for me. Thanks for this example. This was wonderfully helpful! I was just trying to figure out why I couldn't get headerData to work properly, and this gave me that plus sorting.
Thanks very much for the example! Just about to try pyqt for the first time because I couldn't get wxPython's listctrl to do what I wanted. Hopefully pyqt will work out for me. Thanks again. What about selection? If I select some rows and then I change sort, the selection doesn't change. Hey Man! So far, you have the best python blog tutorial that I have found all around internet.
Really nice your Classes and articles. I agree that my method is very inefficient for large N. When trying to use this concept in my own code, I am getting an error that tells me that QTableView. Any thoughts? Your example is great but I have a problem. After double clicking on a row I want to get the data of the row. I do not refresh the table. How could i do this?
Do you have an example code for that?? Thanks for everything. I solved my problem. It was because I opened a new model class before opening the data. So it was my fault Your sort function, because it reverses the whole list when sorting in descending order, breaks "stability". I used this technique instead:.
My QTableView has only one column and few rows, but the QTableView shows a big white space in the row section after displaying the rows and a white space after displaying a single column. How do i fix this. I just need to change the row length and column length of the QTableView to the string list which i use for the model. I have a one dimentional string array.More ….
Inherited by: QTableWidget. A QTableView implements a table view that displays items from a model. You can navigate the cells in the table by clicking on a cell with the mouse, or by using the arrow keys. The table has a vertical header that can be obtained using the verticalHeader function, and a horizontal header that is available through the horizontalHeader function. The height of each row in the table can be found by using rowHeight ; similarly, the width of columns can be found using columnWidth.
Since both of these are plain widgets, you can hide either of them using their hide functions. Rows and columns can be hidden and shown with hideRowhideColumnshowRowand showColumn.
They can be selected with selectRow and selectColumn. The table will show a grid depending on the showGrid property.
PyQt 4.3 QTableView / QAbstractTableModel sorting example
The items shown in a table view, like those in the other item views, are rendered and edited using standard delegates. However, for some tasks it is sometimes useful to be able to insert widgets in a table instead. Widgets are set for particular indexes with the setIndexWidget function, and later retrieved with indexWidget. You can make the cells fill the available space by stretching the last header section.
For some specialized forms of tables it is useful to be able to convert between row and column indexes and widget coordinates. The rowAt function provides the y-coordinate within the view of the specified row; the row index can be used to obtain a corresponding y-coordinate with rowViewportPosition.
The columnAt and columnViewportPosition functions provide the equivalent conversion operations between x-coordinates and column indexes. Constructs a table view with a parent to represent the data.
Returns the column in which the given x-coordinate, xin contents coordinates is located. This slot is called whenever columns are added or deleted. The previous number of columns is specified by oldCountand the new number of columns is specified by newCount. This slot is called to change the index of the given column in the table view. The old index is specified by oldIndexand the new index by newIndex.
This slot is called to change the width of the given column. The old width is specified by oldWidthand the new width by newWidth. Returns the column span of the table element at rowcolumn. The default is 1. Returns the x-coordinate in contents coordinates of the given column. Returns the width of the given column.
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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. This is my example code. I tried many different ways to use self. I tried to get infos from the Documentation, but i didn't get a clue from documentation and didn't found an good example on the web. I have forgotten where I got the base pandasmodel, probably from here.
Learn more. Asked 5 years, 1 month ago. Active 2 years ago. Viewed 6k times. DisplayRole: return QVariant self.
DescendingOrder: self. Netbus Netbus 2 2 silver badges 9 9 bronze badges. QtCore import pyqtSignal the equivalent? You'll have to use "new-style" signals and slots in PyQt5see e. Active Oldest Votes. DisplayRole : if index.Gimbal brands
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