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/*******************************************************************************
* Copyright (c) 2008, 2010 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.help.ui.internal.util;
import org.eclipse.core.runtime.Platform;
import org.eclipse.osgi.service.environment.Constants;
import org.eclipse.swt.widgets.Display;
public class FontUtils {
private static final int TRAY_FONT_HEIGHT_LIMIT = 17;
/*
* Determine whether the font is suitable for use in a tray dialog
* @return true if the font is so large that the tray would look bad.
*/
static public boolean isFontTooLargeForTray() {
try {
int height = Display.getDefault().getSystemFont().getFontData()[0].getHeight();
return height > TRAY_FONT_HEIGHT_LIMIT;
} catch (RuntimeException e) {
return true;
}
}
/*
* Get a sequence of JavaScript which will scale the embedded browser contents
* @param percent The percentage scaling relative to the default size
* @return Javascript to perform the scaling or null if we cannot create scaling script for this OS/browser
*/
static public String getRescaleScript(int percent) {
String scaleString = percent/100 + "." + (percent % 100) / 10; //$NON-NLS-1$
String os = Platform.getOS();
if (Constants.WS_WIN32.equalsIgnoreCase(os) ||
Constants.OS_MACOSX.equalsIgnoreCase(os)) {
return "document.body.style.zoom = " + scaleString; //$NON-NLS-1$
}
return null; // No rescale in Mozilla browsers
}
/*
* Function to determine whether the browser in the help view supports a zoom command
*/
static public boolean canRescaleHelpView() {
String os = Platform.getOS();
if (Constants.WS_WIN32.equalsIgnoreCase(os) ||
Constants.OS_MACOSX.equalsIgnoreCase(os)) {
return true;
}
// No rescale in Mozilla browsers, see Bug 227198
return false;
}
}
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