Filter KeywordFilterField customized for the tabular data model

I am currently looking for the rows in the table that is filtered through the KeywordFilterField. The underlying data are in table form:

Contact {name, phone, etc etc}

The KeywordFilterField shows only what I pass to it (Contact.Name) by calling setSourceList() and filters that the channels in the list. So if I get the numbers, which will return a list empty, because none of the Contacts have numbers in their names.

However, what I want to do is query the table, like a SQL query, retrieve lines that correspond to a part of Contact.Name or Contact.Phone. (Remember this application don't use SQLite.) I'm using RMS to persistent storage and I created my database and queries of base by hand.)

Is there a way I could customize/override the filter query so that the KeywordFilterField calls my query functions rather than it's default filter String? It is a base with search CRUD application. I use KeywordFilterField because it's everything I need.

Any help would be useful.

It is possible with a text field and a list field, this way you can make your own personalized search for the keyword filter field does not search your data the way you want. In addition, I know that the keyword filter field is broken and that it was returning always completely incorrect search result for me.

Here's an overview of what to do. Some things I can't tell you how for example to what is happening in the function "searchContacts" since it is up to you to write the code to do whatever custom search you want.

class CustomKeywordFilterScreen extends MainScreen implements FieldChangeListener, ListFieldCallback
{
    //just a slightly modified edit field for use in entering keywords
    private CustomKeywordField _filterEdit;
    //a standard list field
    private ListField _countryList;

    //temp variable to hold the last keyword searched so we don't search for it again
    //you'll see this used later on
    private String _previousFilterValue;

    //any other private vars you need to hold search results go here
    //we'll use an a Contact[] for illustration
    private Contact[] _contactResults;

    CustomKeywordFilterScreen()
    {
        super(Manager.VERTICAL_SCROLL | Manager.VERTICAL_SCROLLBAR);

        //initiaize to empty string
        _previousFilterValue = "";

        //searchContacts is whatever function you write to do the customized search you want,
    //in this example passing an empty string returns all contacts
        _contactResults = searchContacts(_previousFilterValue);

        //create the edit field and set it as the title of the screen so it's always visible,
    //even when you scroll the list
        _filterEdit = new CustomKeywordField();
        _filterEdit.setLabel("Search: ");
        _filterEdit.setChangeListener(this);
        setTitle(_filterEdit);

        //create the list for showing results
        _contactList = new ListField();
        _countryList.setRowHeight(-2);
        _contactList.setSize(_contactResults.length);
        _contactList.setCallback(this);
        add(_contactList);
    }

    protected boolean keyChar(char c, int status, int time)
    {
        if (c == Characters.ESCAPE)
        {
        //user pressed escape key, if there's something in the edit field clear it
        //otherwise handle it as closing the screen or whatever else you want
            if (_filterEdit.getTextLength() > 0)
            {
                _filterEdit.setText("");
            }
            else
            {
                //close the screen or do something else, it's your call
                //maybe even do nothing, whatever you want
            }
            return (true);
        }
        else
        {
        //all other keystrokes set focus on the edit field
            _filterEdit.setFocus();
        }
        return (super.keyChar(c, status, time));
    }

    public void fieldChanged(Field field, int context)
    {
        if (field == _filterEdit)
        {
        //test the edit field's value against the previously searched value
        //if NOT the same then do a search and refresh results
            if (!_filterEdit.getText().equals(_previousFilterValue))
            {
            //cache the newest search keyword string
                _previousFilterValue = _filterEdit.getText();

                //search your data
                _contactResults = searchContacts(_previousFilterValue);
        //update the list size to cause it to redraw
                _contactList.setSize(_contactResults.length);
            }
        }
    }

    public void drawListRow(ListField listField, Graphics graphics, int index, int y, int width)
    {
        if (listField == _contactList && index > -1 && index < _contactResults.length)
        {
            //draw your list field row as you want it to appear
        }
    }

    public Object get(ListField listField, int index)
    {
        if (listField == _contactList && index > -1 && index < _contactResults.length)
        {
            return (_contactResults[index]);
        }
        return (null);
    }

    public int getPreferredWidth(ListField listField)
    {
        return (Display.getWidth());
    }

    public int indexOfList(ListField listField, String prefix, int start)
    {
        return (-1);
    }
}

class CustomKeywordField extends EditField
{
    CustomKeywordField()
    {
        super(USE_ALL_WIDTH | NO_LEARNING | NO_NEWLINE);
    }

    protected void paint(Graphics graphics)
    {
        super.paint(graphics);

        //Draw caret so the edit field always shows a cursor giving the user an indication they can type at anytime,
    //even when the focus is on the list field that is used in conjunction with this edit field to create a
    //keyword filter field replacement
        getFocusRect(new XYRect());
        drawFocus(graphics, true);
    }
}

Tags: BlackBerry Developers

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