/*
* Copyright Michael Keppler
*
* This program 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.
*
* This program 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
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
package tvbrowser.core.settings;
import java.awt.Font;
import util.settings.FontProperty;
import util.settings.PropertyManager;
/**
* font property which only starts calculation of the preferred default font if
* the settings value is not available to improve performance
*
* @author Bananeweizen
*
*/
public class DeferredFontProperty extends FontProperty {
/**
* if any of these fonts is found on the system then it is used as default
* font
*/
private static final String[] KNOWN_GOOD_FONTS = { "Tahoma", "Trebuchet MS",
"Arial Narrow" };
private Font mDefFont;
private Font mCachedValue;
public DeferredFontProperty(final PropertyManager manager, final String key,
final Font defaultFont) {
super(manager, key, defaultFont);
mDefFont = defaultFont;
}
public Font getDefault() {
if (mCachedValue == null) {
// do not use the getAllFontFamilyNames() method as that leads to scanning
// the system for all font files
for (String knownFont : KNOWN_GOOD_FONTS) {
final Font font = new Font(knownFont, mDefFont.getStyle(), mDefFont
.getSize());
// comparing the font name and Font.DIALOG is not really correct.
// font family name would be more precise, but takes too much time
if (font != null && !font.getName().startsWith(Font.DIALOG)) {
mCachedValue = font;
break;
}
}
}
// we found no font, so set the default
if (mCachedValue == null) {
mCachedValue = mDefFont;
}
return mCachedValue;
}
}