/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package net.sf.eclipsefp.haskell.ui.dialog.dialogfields;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
public class LayoutUtil {
/**
* Calculates the number of columns needed by field editors
*/
public static int getNumberOfColumns(final DialogField[] editors) {
int nCulumns= 0;
for (int i= 0; i < editors.length; i++) {
nCulumns= Math.max(editors[i].getNumberOfControls(), nCulumns);
}
return nCulumns;
}
/**
* Creates a composite and fills in the given editors.
* @param labelOnTop Defines if the label of all fields should be on top of the fields
*/
public static void doDefaultLayout(final Composite parent, final DialogField[] editors, final boolean labelOnTop) {
doDefaultLayout(parent, editors, labelOnTop, 0, 0);
}
/**
* Creates a composite and fills in the given editors.
* @param labelOnTop Defines if the label of all fields should be on top of the fields
* @param marginWidth The margin width to be used by the composite
* @param marginHeight The margin height to be used by the composite
*/
public static void doDefaultLayout(final Composite parent, final DialogField[] editors, final boolean labelOnTop, final int marginWidth, final int marginHeight) {
int nCulumns= getNumberOfColumns(editors);
Control[][] controls= new Control[editors.length][];
for (int i= 0; i < editors.length; i++) {
controls[i]= editors[i].doFillIntoGrid(parent, nCulumns);
}
if (labelOnTop) {
nCulumns--;
modifyLabelSpans(controls, nCulumns);
}
GridLayout layout= null;
if (parent.getLayout() instanceof GridLayout) {
layout= (GridLayout) parent.getLayout();
} else {
layout= new GridLayout();
}
if (marginWidth != SWT.DEFAULT) {
layout.marginWidth= marginWidth;
}
if (marginHeight != SWT.DEFAULT) {
layout.marginHeight= marginHeight;
}
layout.numColumns= nCulumns;
parent.setLayout(layout);
}
private static void modifyLabelSpans(final Control[][] controls, final int nCulumns) {
for (int i= 0; i < controls.length; i++) {
setHorizontalSpan(controls[i][0], nCulumns);
}
}
/**
* Sets the span of a control. Assumes that GridData is used.
*/
public static void setHorizontalSpan(final Control control, final int span) {
Object ld= control.getLayoutData();
if (ld instanceof GridData) {
((GridData)ld).horizontalSpan= span;
} else if (span != 1) {
GridData gd= new GridData();
gd.horizontalSpan= span;
control.setLayoutData(gd);
}
}
/**
* Sets the width hint of a control. Assumes that GridData is used.
*/
public static void setWidthHint(final Control control, final int widthHint) {
Object ld= control.getLayoutData();
if (ld instanceof GridData) {
((GridData)ld).widthHint= widthHint;
}
}
/**
* Sets the heightHint hint of a control. Assumes that GridData is used.
*/
public static void setHeightHint(final Control control, final int heightHint) {
Object ld= control.getLayoutData();
if (ld instanceof GridData) {
((GridData)ld).heightHint= heightHint;
}
}
/**
* Sets the horizontal indent of a control. Assumes that GridData is used.
*/
public static void setHorizontalIndent(final Control control, final int horizontalIndent) {
Object ld= control.getLayoutData();
if (ld instanceof GridData) {
((GridData)ld).horizontalIndent= horizontalIndent;
}
}
/**
* Sets the horizontal grabbing of a control to true. Assumes that GridData is used.
*/
public static void setHorizontalGrabbing(final Control control) {
Object ld= control.getLayoutData();
if (ld instanceof GridData) {
((GridData)ld).grabExcessHorizontalSpace= true;
}
}
}