com.alee.laf.combobox.WebComboBoxCellRenderer Maven / Gradle / Ivy
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/*
* This file is part of WebLookAndFeel library.
*
* WebLookAndFeel library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* WebLookAndFeel library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with WebLookAndFeel library. If not, see .
*/
package com.alee.laf.combobox;
import com.alee.laf.list.WebListCellRenderer;
import com.alee.managers.style.StyleId;
import com.alee.utils.TextUtils;
import javax.swing.*;
import java.awt.*;
/**
* Default cell renderer for {@link com.alee.laf.combobox.WebComboBoxUI} selected value and popup list.
*
* @author Mikle Garin
*/
public class WebComboBoxCellRenderer extends WebListCellRenderer
{
/**
* Returns style ID for specific list cell.
*
* @param list tree
* @param value cell value
* @param index cell index
* @param isSelected whether cell is selected or not
* @param cellHasFocus whether cell has focus or not
* @return style ID for specific list cell
*/
@Override
protected StyleId getStyleId ( final JList list, final Object value, final int index, final boolean isSelected,
final boolean cellHasFocus )
{
return index == -1 ? StyleId.comboboxBoxRenderer.at ( list ) : StyleId.comboboxListRenderer.at ( list );
}
/**
* Returns corrected preferred size in case text and icon were not specified.
* This will generally prevent combobox and popup list from being shrinked when it contains empty label.
*
* This is not really performance-efficient so it is recommended to provide at least space as text when customizing renderer value.
* Otherwise this mechanism will start working with those values in unefficient way to prevent visual issues.
*
* @return corrected preferred size in case text and icon were not specified
*/
@Override
public Dimension getPreferredSize ()
{
final Dimension size;
if ( TextUtils.isEmpty ( getText () ) && getIcon () == null )
{
setText ( " " );
size = super.getPreferredSize ();
setText ( "" );
}
else
{
size = super.getPreferredSize ();
}
return size;
}
/**
* A subclass of WebComboBoxCellRenderer that implements UIResource.
* It is used to determine cell renderer provided by the UI class to properly uninstall it on UI uninstall.
*/
public static final class UIResource extends WebComboBoxCellRenderer implements javax.swing.plaf.UIResource
{
}
}