I often wonder why JavaFX does'nt provide an option to show tree lines in TreeView. I tried to search if someone has come up with an approach/solution/tweak. But could'nt find any.
This is the most common implementation for tree structure. Do someone know why JavaFX didnt provide this feature? Is it because of any unavoidable issues or any performance related issues or is it pure design choice ?
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We need a tree view with File system and check boxes in QT. Is there any way to achieve that?
The tree we need would look something like below:
UPDATE:
I am able to achieve it with subclass of QFileSystemModel. Still have few challenges, but at least subclass is working. Below is the code if anyone needs it. Below is the link to the code -
https://drive.google.com/file/d/1qViZ3iEW2pV2th0jQhzneDL14SEhIgS0/view?usp=sharing
The pending work is to apply a wait cursor (or make treeview uneditable when the check/uncheck is taking place).
PS: It will take a lot of time if root node is checked.
Well, all of that can be achieved with minimal customizations of built-in classes, actually those checkboxes is almost the only thing that has to be done yourself.
QFileSystemModel already provides a proper model for displaying the current filesystem contents, it can be subclassed
As for QML, the best demo is already provided by Qt, check the File System Browser Example. This example uses some deprecaded Qt functionality, but still it shows the basic concept.
The modern techniqes can be also found in the answers to the following question: Qt File Browser based on QML
Hopefully, all that helps you, good luck!
Do any developers use JavaFX alone over an FXML?
The benefits are obvious and of course knowing what the layout does is helpful. So I am wondering if there is any reason to learn about how the placement works and how everything works together behind the scenes of an FXML, as if I were to hard code it all?
I am trying to self teach myself somethings and I don't want to "half-ass" it. I coded very little in JavaFX, and used an FXML once, but if no one codes in JavaFX alone (or if there is any point to), maybe I'll just skip the process of learning about the code itself and jump right into the FXML
Sure it is possible to use JavaFX without FMXL!
But if you want to use FXML you could take a look at the Scene-Builder. Could be very useful and save you some time because you don't have to write all the FMXL yourself.
This thread should kind of answer your question too:
Java FX: declarative vs procedural
Hope this helps!
With custom controls and more complex GUIs, one usually ends up with a bunch of nested panes. Esp. with SceneBuilder its very easy to put together such a design. Are there any performance implications I should be aware of associated with this approach esp when some of these controls will be used in a TableView with a lot of rows (~1000) and lots of updates?
From my days working in Adobe Flex, this approach was frowned upon and could lead to sluggish GUIs.
No, there aren't. Java FX is better than Swing in that regard.
However, the first thing you should do - if you have concerns like that - is to invest a few hours and create a simple prototype. JavaFX is perfect for RAD. Then you'll see. Nobody can possibly guess what your goal is when you say "TableView with a lot of rows (~1000) and lots of updates".
Even though it is not a problem usually, it always makes sense to optimize your UI.
Proper use of JavaFX layout panes helps. Specifically, take a look at GridPane.
I need to show my list from heap.
I am newbie in QT , so I have some questions .
1. What is better to use TreeView or TreeWidget ?
2. How can I control level of selected node ?
3. What is correct way to add items to Tree*** component ?
Thx for answers in advance ?
I came across this post that might help you decide Model-based and item-based? .
In my opinion, if you looking for a more robust and extensible program you might be better off creating your own subclassed model and setting it up with the view.
However if you just want something that you can add a few entries too and be able to link that items index up with with whatever information you want to display, then you could use the widget and add your entries to it.
As you are a beginner, I would suggest that you go the long way around and get your model and view implemented as it would provide you with more experience and will also give you a better understanding of the model view architecture; Which in the long run will allow you to develop better applications.
Guys could any one point it out to me a link to web page where I can find a hierarchy of classes in Qt, preferably as a diagram (something in UML style)? I'm just starting to learn it and I'm finding it quite difficult to work with all these classes - well, mainly with widgets and layouts at the moment- without knowing where they belong.
Thank you.
The official class hierarchy is found here:
http://doc.qt.io/qt-4.8/hierarchy.html
There are also some class charts. It is really big, you need a plotter to print this in a size which is readable:
http://doc.qt.digia.com/extras/qt43-class-chart.pdf
I was looking for the same thing but for QT 5.3. If anyone is interested here you have the class hierarchy for last QT version.
http://qt-project.org/doc/qt-5/hierarchy.html
Unfortunately, the classes diagram does not exist as it is mention here.