FAQ-0795 How do I change the colours of the highlighted item in a text list box?


FAQ-0795 How do I change the colours of the highlighted item in a text list box?

» Symbian OS » Developer Knowledgebase » FAQ-0795

Classification:	C++	Category:	EIKON
Created:	05/24/2002	Modified:	06/21/2002
Number:	FAQ-0795
Platform:	Symbian OS v6.0, Symbian OS v6.1

Question:
How do I change the colours of the highlighted item in a text list box and make it appear in my dialog?

Answer:
You can use the CCoecontrol::OverrideColorL(...) method to change the default colour list which the control picks up, then force the control to update to use the new colour list with a call to HandleResourceChange(KEikColorResourceChange). The best place to do this is in PreLayoutDynInitL():

// MyApp.cpp

void CModifiedListBoxDialog::PreLayoutDynInitL()
{
CEikTextListBox* listbox=(CEikTextListBox*)Control(EModifiedTextListBox);
listbox->OverrideColorL(EColorControlHighlightBackground, TRgb(200, 100, 0));
listbox->OverrideColorL(EColorControlHighlightText, TRgb(0, 100, 200));
listbox->HandleResourceChange(KEikColorResourceChange);
CDesCArray* listboxArray=((CDesCArray*)listbox->Model()->ItemTextArray());
...
}

You can then include the control in your dialog by adding it to your .hrh and .rss files as follows:

// MyApp.hrh

enum
{
EModifiedTextListBox
};

// MyAppUi.rss

RESOURCE DIALOG r_modified_listbox_dialog
{
...
items =
{
DLG_LINE
{
type = EEikCtListBox;
id = EModifiedTextListBox;
control = LISTBOX
{
flags = EEikListBoxIncrementalMatching;
};
}
};
}

The logical color options which can be passed as the first argument to OverrideColorL() are defined in gulcolor.h.