RFR: 7093691: Nimbus LAF: disabled JComboBox using renderer has bad font color [v3]
Abhishek Kumar
abhiscxk at openjdk.org
Mon Feb 6 05:03:51 UTC 2023
On Fri, 3 Feb 2023 19:56:18 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:
>> Before the fix, a JComboBox in Nimbus L&F would have normal black text even when the JComboBox was disabled if SynthComboBoxRenderer was replaced with a DefaultListCellRenderer. This text should be greyed out like in other L&F's. When looking into the defaults for Nimbus L&F files for attributes and states of a JComboBox, it confirm that the intention for disabled JComboBoxes is nimbusDisabledText (which is grey text).
>>
>> SynthComboBoxes have an additional check in its default SynthComboBoxRenderer that enables/disables the renderer itself. The SynthComboBoxRenderer inherits its enabled state from the parent ComboBox. Since the renderer with DefaultListCellRenderer is in a separate class without a reference to the comboBox, a listener was added to SynthComboBoxUI.
>>
>> An additional issue occurred in DefaultListCellRenderer because the renderer overrode the listener's re-assigned enabled state. In testing, setting the enabled state in DefaultListCellRenderer is redundant for all L&F's and is not needed here. However, instead of removing it altogether, a conditional was added specifically to allow ComboBoxes to skip setting enabled state here.
>>
>> After the fix, the Nimbus JComboBox with DLCR set matches the appearance of a normal Nimbus JComboBox. I can enable/disable the JComboBoxes in the test, and the UI elements behave and appear as expected.
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
>
> Simplify Nimbus LAF check
test/jdk/javax/swing/JComboBox/DisabledComboBoxFontTest.java line 53:
> 51:
> 52: private static JFrame frame;
> 53: private static boolean hasNimbus;
`hasNimbus `variable is unused now, can be removed.
test/jdk/javax/swing/JComboBox/DisabledComboBoxFontTest.java line 118:
> 116: UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
> 117: }
> 118: catch (Exception e) {
Just a suggestion, try-catch block can be like
try {
...
} catch {
...
}
-------------
PR: https://git.openjdk.org/jdk/pull/12390
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