I'm using a QTableView with a QAbstractTableModel and a QSortFilterProxyModel so that I can sort the items by clicking on the table headers. I'd like to add the option for the user to sort the rows in the view manually, by dragging them. I don't need to be able to do drag and drop from/to any external application, just to change the order in the list. I also don't need to change the data in the model, I only want the order to be different in the view.
I've been looking through the documentation, and it seems like I have to implement mimeTypes, mimeData, and dropMimeData, but this gets very complicated fast! Some of the data in my model is not actually displayed in the view, and like I said I don't want to change the order of data in the model. Is there a way to simply drag items to change their sorting (just like the headers are already able to do) without a huge amount of coding?
Updated for QT5 to remove deprecated methods
If you are using PyQT All you need to do for your requirements is this:
your_tableview.verticalHeader().setSectionsMovable(True)
your_tableview.verticalHeader().setDragEnabled(True)
your_tableview.verticalHeader().setDragDropMode(QAbstractItemView.InternalMove)
Then rinse and repeat with horizontalHeader if you want those rearrange-able too.
You are absolutely right, you shouldn't need to touch or even know what the model is for this functionality. This is further demonstrated by your proper use of the QSortFilterProxyModel decorator over the model itself.
The stuff you saw about mimeTypes and all of that stuff is for drag-and-drop of actual objects of varying sources from other windows/applications/desktop/etc and isn't needed for what you are trying to accomplish currently.
Related
I need to implement a drop-down which has a delete 'X' option next to each option item. Somewhat like the image shown below.
The drop-down is populated dynamically and I need a way that does not inlvolve using list as an alternative.
EDIT: The icons next to each dropdown item refers to 'Edit'/'Delete'
You cannot put a checkbox into the usual <select> or multi-select HTML element.
However, here is another question where several good options are discussed.
This looks like the most useful and best suited to your purpose:
https://stackoverflow.com/a/27547021/1447509
And here is an example of how to change the default checkmark to an X:
https://stackoverflow.com/a/40123793/1447509
Sources:
How to use Checkbox inside Select Option
After selecting check box Instead of Tick symbol need X in html
UPDATE:
Given that you need both the HTML markup and the javascript to make it do what you want, you have two (possibly 3) steps to do:
This answer provides a good example of how to create the custom-rolled <select> control.
This answer shows you how to replace the checkbox created in step 1 with an icon/image of your choosing.
The javascript to remove the x'd <option> is very simple:
$(this).closest('option').remove();
IF you also need to save these results, then you also need to learn:
4a. Server-side SESSIONS (so that each user's customizations are saved for them)
4b. A login system, so you know for which user to save the current customizations.
4c. Just the basics of how to use a back-end database, such as MySQL/MariaDB, in which to store the user customizations.
4d. AJAX - so you can schlep info to the back-end for insertion into the database without refreshing (or navigating away from) the current page. AJAX replaces the ancient and no-longer-used <form> construct. Frankly, once you've used AJAX a couple of times, you'll never go back. Totally easy.
If you are in a bind and need someone to create the whole thing for you, I refer you to one of these websites - I have used such services myself and can recommend them.
The functionality I seek is very similar to the default ModelStructurePanel model browser, except that I need to list only a subset of elements, by passing a list of dbIds of the elements I want listed. By clicking on an element on that list, have the view focus on that element.
I figure there might be two ways of achieving this by using the ModelStructurePanel (although I'm open to using something else):
Creating a new instanceTree with only the specified elements, then doing something like viewer.modelstructure.setModel(newInstanceTree)
Overwriting the ModelStructurePanel.shouldInclude method to hide all elements but the specified ones.
I have googled for Viewer code boilerplate that would provide this functionality, but have not found it. Any help is very much appreciated.
There is a basic sample here very close to what you described, and I would go with customizing just one action instead create a new one, seems easier.
I have a metro application in which I have a Listview and service data contains above 100 items. Initially when am loading listview in my page it has to display only 8 items plus 1 more-related item and later if i click on a more-item it needs add another 9 items to my page and totally it has to show 17 items in my page and need to display more item also like that flow continues.What should I get to get my scenario.Can anyone help me.Below I tried to give u my scenario.
Thank you.
Take a look to this article: http://www.silverlightplayground.org/post/2012/06/10/Metro-Incrementally-load-GridView-and-ListView-with-ISupportIncrementalLoading.aspx.
There are a couple of solutions -- all depending on the work that you want to undertake. Also, I would suggest that you don't have a "More" button if you can help it -- it's not the best user interaction. Option 2 is going to give you the best experience.
Option 1
Use WinJS.Binding.List as your data source -- using this you can manipulate it like a JavaScript Array (e.g. push, pop etc). As you add & remove items from the list, the list view will react to those changes.
Full details are here.
Option 2
Create a VirtualDataSource derivation that is intimately aware of the ways in which you can request your data, and can offer up a consistent interface to the ListView. This enables your UI to be completely flexible to it's layout, and request enough data to satisfy the available space, while virtualizing the UI elements (better memory/performance), and the data (ensuring only the data needed by the user is requested.
Full worked example here.
I have a basic ASP.Net MVC 3 application which has a number of controllers and a number of actions (and subsequently views)
A common feature of the application is to show a pop-up dialog window for basic user input. One of the key features of this dialog process is a faded mask that gets shown behind the dialog box.
Each of these dialog window controls is in a separate Partial View page.
Now, some view pages may use multiple dialog boxes, and therefore include multiple partial views in them - which as is would mean multiple instances of the "mask" element.
What I am trying to find a solution for is to only need to create one instance of a "mask" element regardless of the number of dialog partial views I include, and then the script in each partial dialog will have access to this element (so basically it just needs to be on the page somewhere)
The only real idea I have come up with so far is to add the "mask" element to the master page (or in the original view page) and this will mean it only gets added once. The problem here is that it will be added even when it is not needed (albeit one small single element)
I can live with this, but I would like to know if there is a better way to handle these kinds of scenarios?
A quick idea that came to mind is some kind of master page inheritance hierarchy, So I may have a DialogMasterPage that inherits from the standard current master page. How does that sound for an approach?
Thanks
To do something like this, where each module can register their need for a certain thing in the master page, you can use HttpContext to store a flag of whether you need to write the mask div, and just set that property in each partial. At the end of the master page, if the flag is set, you can then write the mask div if its set to true.
Obviously to make this cleaner you could wrap it all in an HtmlHelper extension or something.
My initial thought is for you to use something like jQuery UI where it handles the masking for you or if you are using something custom you can load the content for the dialog via ajax then show it in the single dialog on the master page.
I'm working on a reporting app which displays incoming data as pie by default. We'd like to offer the user the ability to switch to bar, or column, or area, or any of the other charts with the click of a button. Since we already have the data in the app, it should be fairly simple no? Does anyone have an idea of how I might approach this?
andy
You can approach this a couple different ways. If it was me I would either set up a view stack with each of the chart types you want the user to switch to and they you can simply change the viewstack selectedIndex. Alternatively, you can have just a single chart holder container. Then just make function to dynamically generate each chart (Example). Then all you need to do is remove the existing and add the new chart.
I accomplish this by creating a state for each specific chart type. Then just change between states based on user input. You can use one data provider for each chart or create specific data providers for each.