I want to create a JavaFx LineChart able to display data from entity class dynamically selected by the user through a combobox.
Since the number of entity and their attributes is big and could be change, I want to create this process in a flexible way without hardcode the combobox filling and a switch case state to select the proper get method.
Any suggestions on how I can manage this two operations? I'm thinking to something like an application.properties file and the use of reflection, but I didn't find the right solution.
thanks in advance
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I have created a JavaFX application, it have TableView to show table data. I am obfuscating final jar using Proguard-4.8, but unable to view data in TableView, we have created public static classes for table data binding. In my table if I have three columns say two columns show text and remaining one column have button added then after obfuscation I am able to see button only, rest two columns show blank rows.
Without obfuscation my jar showing all text data correctly. I have no CSS applied over TableView.
Can someone suggest me where I am doing wrong?
Thanks,
Are you using PropertyValueFactory? This would mean the property is accessed via reflection and if you obfuscate the property it can't be found anymore!
I have a grid view which is dynamically populated with data. and the no.of columns may be changed each time according to the query.. i want to make the first field to select the row of data(by making it template field). I cannot declare statically the columns as template fields because the column numbers are dynamic.
can any one help how to proceed.
You need to create your own template builder - a class implementing ITemplate interface - use InstantiateIn to build your template by adding needed controls to the given template container. Add TemplateField column to the grid-view and use your class as ItemTemplate.
See this article where this is illustrated: http://www.mindfiresolutions.com/How-to-add-a-TemplateField-to-a-GridView-dynamically-841.php
Further, what you want to achieve might be possible by creating your custom DataControlField - for example, for selection column, I may use a class inherited from CheckBoxField (something like http://www.asp.net/data-access/tutorials/adding-a-gridview-column-of-checkboxes-cs)
It's a bit of work but the following article walks through all of the steps: How to create template columns dynamically in a grid view
There is no easy answer for what you're trying to do but the above link will help you if you are willing to put in the time and effort to get it done.
I have a database, which tables should viewed in a widget. Seems simple, but I can't decide what to du or use.
Each row of the table should be viewed as one list view item, for instance, imagine table with this fields: id, title, content, date, number.
I need to view it as a list view (not hard-coded, it may also be another thing, if it is possible or better), and the label of the list view item should be the title field. But when the user clicks or double clicks on that item it should open all the contents of the current row in a separate widget. The all of these can be implemented easily by me, but I can't understand what to use: QListView with its model, or QListWidget? Or maybe QSqlTableModel? The last one is unfamiliar to me, I can read about from documentation, but if you have heard or met some kind things/applications, please provide a better solution for described problem.
Hope I could explain my problem correctly,
Thanks in advance.
Have you read about model/view programming in Qt? Basically you should use some model (QSqlTableModel, QSqlQueryModel, QSqlRelationalTableModel or create your own) an then attach it to QListView or QListWidget.
I am newbie to Qt. I have to display a chunk of data in a QTableView and filter it column wise. For this I have used QSortFilterProxyModel, but as per requirement each column of the QTableView should have a drop-down list which shows unique values in that column. On selection of any of these values in the drop-down, only the rows having that particular value in the column should be displayed in the QTableView (Like you can do in Excel).
How would I implement this?
I had the same issue a week ago
I found a tutorial explaining how to do it. see link below
http://programmingexamples.net/wiki/Qt/Delegates/ComboBoxDelegate
Now my problem is how to retrieve the value of a specific combobox.
I think it is such a complex things to do in C++ and Qt display a combobox into a tableView.
For being a web developer at first I can tell that web language are better suited to do thoses kind of things.
But still some time performance matter and I tried to do it in C++ with Qt but it is not as easy as it seems to be in Web language.
This is very general question, and if I try to explain it all it will take pages, so it's better if you read the Qt model/view architecture documentation.
You can create your own class inherited from QTableView to create your customized table view. You have to use delegates for drop down functions and all. so read the QItemDelegate class documentation and documentation on subclassing delegates as well.
If you want to display it always and not just when editing, I would suggest setting a widget for the specific column like described in this thread: Qt - QTableView - Clickable button in table row
I've got a QTableView for which I want to display the last column always in edit mode. (It's a QComboBox where the user should be able to always change the value.)
I think I've seen the solution in the Qt documentation, but I can't find it anymore. Is there a simple way of doing it?
I think I could archive this effect by using openPersistentEditor() for every cell, but I'm looking for a better way. (Like specifying it only one time for the whole column.)
One way to get the automatic editing behaviour is to call the view's setEditTriggers() function with the QAbstractItemView::AllEditTriggers value.
To display the contents of a given column in a certain way, take a look at QAbstractItemView::setItemDelegateForColumn(). This will let you specify a custom delegate just for those items that need it. However, it won't automatically create an editor widget for each of them (there could in principle be thousands of them), but you could use the delegate to render each item in a way that makes it look like an editor widget.
There are two possibilities:
Using setIndexWidget, but Trolltech writes:
This function should only be used to
display static content within the
visible area corresponding to an item
of data. If you want to display custom
dynamic content or implement a custom
editor widget, subclass QItemDelegate
instead.
(And it breaks the Model/View pattern…)
Or using a delegate's paint method. But here you have to implement everything like enabled/disabled elements yourself.
The QAbstractItemModel::flags virtual function is called to test if an item is editable (see Qt::ItemIsEditable). Take a look at Making the Model Editable in the Model/View Programming documentation.
I can't see an easy way to do this, but you might be able to manage by using a delegate. I honestly don't know exactly how it would work, but you should be able to get something working if you try hard enough. If you get a proper delegate, you should be able to set it on a whole view, one cell of a view, or just a column or row.