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  • Modeling a cellphone bill: should I use single-table inheritance or polymorphic associations?

    - by Horace Loeb
    In my domain: Users have many Bills Bills have many BillItems (and therefore Users have many BillItems through Bills) Every BillItem is one of: Call SMS (text message) MMS (multimedia message) Data Here are the properties of each individual BillItem (some are common): My question is whether I should model this arrangement with single-table inheritance (i.e., one "bill_items" table with a "type" column) or polymorphism (separate tables for each BillItem type), and why.

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  • Public Cell ID databases

    - by Alejandro Mezcua
    Hi. I'm building a location aware mobile application which uses GPS, but i'd like to be able to add cell location too. The best thing I have found so far is to use Google Gears, which has a location API available, but my application is not web based. Are there any good public cell id databases that can be accessed from any kind of application? I have found a few interesting projects out there like OpenCellID, but the database is very poor right now.

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  • disable scrolling to cell in focus

    - by Victor
    I have a jtable inside of a scrollpane. how can i stop the scrollpane from scrolling up or down when a cell that is partly out of view gains focus? the problem is i am setting the cells to editable when the user mouses over them, so when you mouse over a cell that's partly out of view, the view changes suddenly. I don't like this behaviour. any ideas on how to change it?

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  • DataGridView's top left cell value is not displayed.

    - by Spike
    I have a DataGridView, without visible row or column headers, and bound to a BindingList. No matter what I try the top left cell (Rows[0].Cells[0]) is always empty. The cell's Visible property is true, but it never displays its contents. If I make some rows and columns invisible, it's still the top left of the visible cells that isn't displayed.

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  • Draw background for each cell in ObjectListField

    - by user315647
    Hi all, I am creating a blackberry apllication which pre-dominantly uses ObjectListFields..All i need now is to draw an image as a background for each cell. I know this is quiet possible but i am not getting hold of the procedure. if i draw bitmap in drawlistrow() function the bluehighlight gets into the background and the cell highlight becomes very hard to read......can anybody help me with a code snippet to get through this problem ....thanks...

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  • Specifying Cell Format in CSV File

    - by Someone
    I am generating a csv file from a PHP array. It opens just fine in Excel and OpenOffice Calc, however the data in one of the column are zip codes. Excel makes the cell formats of the column number general by default. This results in the leading 0 getting dropped in zip codes. Is there any way I can specify the cell formats within the CSV file?

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  • Validate DataGridColumn cell's individually

    - by Joshua Fox
    How can I validate the cells in a DataGridColumn individually? The validation is configured per-row. For example FIELD VALUE TYPE age 13 Integer height 13x3 Integer registered true Boolean temperature 98.G6 Float In this case, of course 13x3 and 98.G6 would be invalid. Writing a Validator is no problem, and I can grab the TYPE from the data provider object, but now do I get individual access to the GUI cells so I can give the Validator a source which is an individual cell, set the errorString on an individual cell.

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  • Cocoa: How to make table view draw custom views in each cell

    - by Inso Reiges
    Hello, I am learning Cocoa and trying to create an application for Mac that displays a simple book list. Each book is an NSView with its cover image, title and author. I want to present this list as a NSTableView with a single column and a book view in each cell. However i can't yet figure out how to display a custom view inside a table cell in interface builder or programmatically. Any tips would be very appreciated :) Inso.

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  • Copy and paste into a DataGridView cell (C#)

    - by DaBomb
    I need to be able to copy a name or names from one application (using the normal copy commands) and then be able to double click the text cell in a DataGridView to paste the data into the grid cell. Any ideas on how to accomplish this? I am attempting to minimize keyboard use for this functionality.

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  • ListView ToolTip only in First Cell - VB.NET

    - by Louise
    I'm adding a ToolTip to a ListViewItem. However, the ToolTip only shows up when the user hovers over the first cell in the row to which the ToolTip has been applied. MyListViewItem.ToolTipText = "Important Message" The only other code I have related to ToolTips is this: MyListView.ShowItemToolTips = True Any idea how I can make the ToolTip show up on a specific cell in a row, or even the entire row? Thanks.

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  • changing cell background color in qt

    - by Moayyad Yaghi
    hello .. i'm new to pyqt , and i'm still facing some newbie problems :D i have a QTableWidget that is item delegated on a QChoice control ( hope i said it right ) i need to have the cell background color changes whenever a user change the choice control selection briefly: how to change a cell background color in a table widget ?? i use pyqt4 and python 2.6 thanx in advance

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