Dynamically updating jlist

Hello, I'm encountering one problem when I run a background task via org. Task and filling doInBackground and succeeded method. My situation is the following. I'm running a background task where I open some files.

Thanks to the content of the file I'm updating a jcombobox object. My problem is that even data are inserted inside the jcombobox i. My problem is, after populating the ComboBox using a Vector and the toArray method.

I'm having trouble updating the ComboBox when items have been added, amended or deleted in the Vector. Hello all- I have an application with multiple JComboBoxes. The contents of the JComboBoxes is a static collection member so they all have the same values available. The problem I'm having is after I add an item to the static collection, when you pulldown some of the other JComboBoxes, there is nothing displayed at first, but you can click in it I am adding item in the combo box within a fucntion and I am calling that function from actionListener of a button.

Hey, I am calling a function from a class to pass an array of information and to put the name in the comboBox. A value of -1 means that the dimension must be computed as described above. Note that these dimensions define the preferred size of the JList, less the space allocated for the border see JList.

In many cases, providing reasonable values for fixedCellWidth and fixedCellHeight is messy because those values depend on the cell renderer and the current font and so on. The prototypeCellValue property can be used instead. If the prototypeCellValue is non-null, it's used to compute fixedCellWidth and fixedCellHeight by configuring the cellRenderer at index equals zero for the specified value and then computing the renderer components preferred size.

By choosing a big prototypeCellValue -- that is, one that will cause the renderer components preferred size to be as large as needed -- the developer can effectively set the fixed cell size properties.

One common idiom is to use the prototypeCellValue to define fixedCellHeight and then to define the preferred width of the list by setting fixedCellWidth : list1. One can make modest improvements in scrolling performance by building a custom cell renderer and by reducing the cost of transforming list model elements to displayable strings.

Note that the optimizations discussed below trade off generality for speed: they shouldn't be applied unless performance is critical. You can find a complete example that demonstrates the cell renderer optimizations described in this section in the FastRenderer.

This transformation is expensive. But it can be avoided -- if the list model is only being used to drive the display -- by converting the array of Method objects to an array of Strings. The JLabel class centers and left-justifies its text by default, and it clips the text and appends an ellipsis " Sometimes, just left justifying and centering the text is enough.

The cell renderer in the FastRenderer. The FastRenderer application is a simple benchmark that compares the benefit of using a custom cell renderer to that of using the default one. The improvement ranges from 20 to 40 percent, depending on the platform. Page One. Page Two. The Databank. What Is Swing? Special Report.

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