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Questions tagged [model-view]

model-view describes the relationship between the model and the view when using model-view-controller

Model-view-controller is an architecture to separate the model (data) and the view (interface). The model contains the information for a program while the view is the interface with the user. The controller is used to update the model from user input and to update the view when the model changes.

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What are criticisms against using "display_order" fields in your database design?

In my company's software product, a number of database tables make use of a "display_order" field. It's an integer that controls the display order of the elements on the page. Deep down in my gut, I feel like this is a bad practice. (Or at least, a…
Tac-Tics
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How to take a RGBA screenshot with puppeteer?

Im working on a image comparison web application with puppeteer and here's what im trying to do: open a puppeteer page, go to a rendering page with a model-viewer(a google's web graphic API) web component. render something with model-viewer take a…
Jiaxin Sun
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Advice on how to use Qt Model View classes

So I have been writing a Sudoku game in C++. I have most of the game logic done and tested, but I wanted to use Qt on top of it for the GUI. I was trying to figure out the best way to work with the Qt classes for my needs. As a test, I played…
Matt
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QML TreeView display nodes by levels or custom delegate

I have a tree model derived from a QAbstractItemModel. And I can display the data in a tree like way. What I want is to display teh data by the layers. To display only one level of a layer at a time AND put each layer on a stack and navigate…
Bob
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How to get other fragment's ViewModel

I have an external event that changes several fragments state, As I am using Android architecture components I've created several ModelViews for every fragment. What is the right way to send messages between ModelViews
Andrew Matiuk
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MVC 5: ViewModel / Passing lists for the create

So I am currently studying and analyzing the use of ViewModels. In my Application (a so called "Restaurant") I want the ability for my "users" to create a menu. When they want to create a menu: They can choose the name + the amount of persons that…
Kahn Kah
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Qt use same model for QListView and QTableView

I'm trying to use the same model to display pieces of information on 2 different kind of view. I need to show information about 150 objects that have a description and can be either on or off. One of the view is a summary of the on/off states of my…
Bertrand Thelen
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Qt Model-View: What's the correct way to update the model and then the view when the data is stored and changed outside the model in a std::vector

I have subclassed a QTableModel and the data I want to be displayed is the contents of an std::vector which I keep a reference to in my model. I have subclassed a QTableView to represent MyClass objects and display different properties of MyClass…
nik4emniy
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how to store and retrieve custom data (using QtCore.Qt.UserRole?) with Qtableview /QAbstractTableModel in pyqt?

I'm quite new in the use of model/view framework and I'm having some trouble, I'm using a Qtableview and a QAbstractTableModel on a widget and I'm trying to store some custom data in the QModelIndex using the "data" method from the…
MrX
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Sharing one model between two views that display different columns of data

In this case, I am working with legacy code. I have a large dequeue data structure. This is the data source. I need two QTableView widgets on a single dialog that utilize the same data source but show different columns of data. Since each table…
user2836797
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Do I need to notify QTableView that the amount of columns changed in QAbstractTableModel subclass?

I have my own QAbstractTableModel subclass. When new data is inserted in it - I issue beginInsertRows/endInsertRows and then dataChanged with correct indexes. rowCount seems to be changed OK as I see scroller appear and grow, but .... columnCount is…
Zeks
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A checkbox only column in QTableView

I have a table in Sqlite database which I display using QTableview and QSqlQueryModel. The first column needs to have a header which is a checkbox and all the items in the column need to be checkboxes too. I have implemented the first column header…
gfernandes
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Custom abstract widgets with PyQt

I have made a couple of projects in PyQt now, and I am becoming more familiar with the model/view school of thought that Qt adopts. I have used this for things like list and table views with a custom model behind them to display and manipulate data.…
horriblyUnpythonic
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How to use QCalendarWidget with QDataWidgetMapper?

I currently have my calendar widget mapped using QDataWidgetMapper like this (using PySide): self.mapper.addMapping(self.ui.calendar, 2, "selectedDate") And it does display the correct date when I do: self.mapper.toFirst() But my problem is that…
Leandro M Barbosa
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Styling Qt Model/View items based on their ItemDataRole properties

I have a QTreeView with items from my own model (QAbstractItemModel derived). Now I would like to style the items (with a stylesheet on the QTreeView) so that depending on various properties they would have various backgrounds. Also it seems that…
Adam Badura
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