I am making an applocation to demonstrate some algorithms, and I am using gtk2hs. When the user selects an algorithm, I want the whole window to change (different layout, input, output interface...). How could I do that? For example, is it possible to change the widget in a container? I tried a table but could not changed the content of a cell, so that doesn't seem like a good idea.
Also I want to change the number of input fields according to another input field, and that seems like the same problem for me (removing widgets from a box) but it might be totally different in terms of solution.
Thanks
How to change the content of a box, can you delete a widget from it? If yes, how?
Use widgetDestroy. See for example this tutorial.
Related
I've added some code as found here Big problems with MFC/WinAPI to colour tab titles the same as the reset of the dialog, which works, but unfortunately all the tabs end up with the same name. This doesn't surprise me all that much as GetCurSel() is used to grab the text to use, and only one tab can currently be selected, but I'm struggling to see how you access the correct tab index from OnDrawItem().
I've googled and had a look on MSDN but don't see how anything passed to OnDrawItem lets you know which tab is currently being drawn, rather all the examples I've seen assume you're only interested in the one currently selected. All I want to do is something along the lines of GetWindowText() on the child window and redraw with that. I'm also unsure of the parent/child/sibling relationship between the sheet, tab control and page - it depends who you listen to.
I should probably add that I'm also unsure why all the tabs are redrawn when I select one. I don't know if this is normal or something specific to this implementation (that's something I'm looking at, but like seemingly everything else in this code base it's multiply inherited several times over ...).
Cheers for any help.
Not to worry, I now realise lpDrawItemStruct->itemID holds the tab index so I can get a handle to the tab using that.
I have the following issue, concerning the way to fine control Japanese input in an iOS app. To make things clear I include an image to this post (see below).
As one can see I have typed や in the input text field and a bunch of choices (や 役 矢 訳 ヤ 屋 焼き …) appear above the keyboard for possible conversions.
Here is what I would like to know:
The choices presented in the picture make no sense for my particular app. I would like to be able to set myself the possible conversions offered to the user.
In this case it would be (山形県 山口県 山梨県). Does anyone know how I can achieve this?
In other words I am trying to find out how handle the set of data appearing above the keyboard.
Thanks in advance for any relevant information.
Does anyone have an example of using a QWidget as an editor in a QAbstractTableModel?
I have a column which when edited should create a QCombobox with the list of choices.
The docs seem to suggest I need to write a QAbstractItemDelegate and a custom paint function but that seems overkill to simply pop-up a standard QCombobox in Qt::EditRole.
Note - the combo box contents are the same for every row and it only needs to be shown when somebody clicks in the cell.
I know this should be simple but I can't get it to work. It's easy for a QTableWidget based table - but I need it for a very large data table.
The docs seem to suggest I need to write a QAbstractItemDelegate and a custom paint function but that seems overkill to simply pop-up a standard QCombobox in Qt::EditRole.
You don't need to go that far. One way is to subclass QStyledItemDelegate and then override createEditor() so that it returns your prepopulated combo box. Its setEditorData and setModelData functions will probably already suffice if you`re using basic Qt value types.
If you need something more generic that works across many different models, you can create a QItemEditorFactory that associates your editor with the correct type. This also works well with custom types.
When indicated by your view's EditTrigger, your view will get the delegate specific to the cell on which the edit is being invoked and call delegate->createEditor(...) which can then size the combo box according to the options parameter as well as set the current entry to the value specified by the model, although most of this should be handled by the QStyledItemDelegate. Thus, you won't have to worry about the Qt::EditRole directly as the view will handle that.
Did you try and have a look at the following example from Qt :
Spin Box Delegate Example
Maybe it will give you a much clearer view on the subject !
Hope it helps a bit !
I'm currently learning to program Ruby with GUI. And has chosen wxruby. But has never used wxwidgets before. So my question is, which widgets do I use for the users list, the message list (scrolling) and the input area ?
Want to be able to choose font, color and use icons etc in the input area and the message list. And hoping to be able to have the userimage, nickname, status and smileys in the userlist also.
So anyone knows which to use?
For the input area and the message display, you'll probably want to use a wxRichTextCtrl, which will let you set fonts, colors, styles, etc. The main difference between the two is that the message display should be read-only. To change the style on the input area, you'll probably have wxButtons bound to functions to modify the style.
The userlist will probably be best off as a wxTreeCtrl, because you'll probably want to be able to have groups that you can expand. On the other hand, it might be a lot simpler to use a wxSimpleHtmlListBox because you will be able to use HTML to describe what you want to show, rather than having to worry about the finer details of another control.
For future reference, you might want to look at the Classes by Category page to help you figure out which controls you need, when you have an idea of what you're looking for.
I'm trying to create a very simple selection list widget based on NSOutlineView. However, I'm having a hard time figuring out how to display an icon and a label right next to it, which is really the expected behavior in all the mainstream implementations of that kind of widget out there (iTunes, mail, Finder,...).
So far I am just binding two separate cells, but then when I'm expanding the tree, the icon cell grows larger and a gap appears between the icon and its accompanying label. I know I can probably overcome this problem by extending NSCell and provide a custom class, but as what I'm trying to achieve is really the standard thing, I can't be resigned to accept that there isn't a simpler solution.
Candide
Sadly, there isn't a 'text and icon' cell that you can just use, fresh out of the box as you would like. However, when I was working on a project, I found that Apple released some sample code that implements this, since it is such a common idiom.
This can be found here, specifically ImageAndTextCell.h/m
It can help teach you about UI customization by reading through this example, but scratching that, just dropping the ImageAndTextCell straight into your project should do just fine.
You need to create ImageAndTextcell to combine text and icon..
you can create ImageAndTextcell like this Sample Project