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/*******************************************************************************
* Copyright (c) 2004, 2006 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 Rational Software - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.ui.util;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Control;
import org.eclipse.jface.util.Assert;
/**
* Helper class to layout a number of children if the composite uses a <code>GridLayout</code>.
* If the numbers of widgets to be layouted into one row is smaller than the number of columns
* defined for the grid layout the helper class assigns a corresponing value to the <code>
* GridData.horizontalSpan</code> field.
*
* Additionally a row layouter manages a default <code>GridData</code> object for each column.
* If set this grid data is used for the widget if it doesn't manage its own grid data object.
*
* Call one of the <code>perform</code> methods to assign the correct grid data objects to
* a set of widgets according to the number of columns passed to the layouter's constructor.
*/
public class RowLayouter {
public int spanHorizontalAlignment= -1;
public int spanGrabExcessHorizontalSpace= -1;
public int spanHorizontalSpan= -1;
public int spanHorizontalIndent= -1;
public int spanWidthHint= -1;
public int spanVerticalAlignment= -1;
public int spanGrabExcessVerticalSpace= -1;
public int spanVerticalSpan= -1;
public int spanHeightHint= -1;
private int fNumColumns;
private boolean fOrder;
private Control fLastControl;
private GridData[] fDefaultGridDatas= new GridData[4];
public RowLayouter(int numColumns) {
this(numColumns, false);
}
public RowLayouter(int numColumns, boolean order) {
fNumColumns= numColumns;
fOrder= order;
}
public void setDefaultSpan() {
spanHorizontalAlignment= GridData.FILL;
spanGrabExcessHorizontalSpace= 1;
}
public void perform(Control c1) {
perform(new Control[] {c1}, 0);
}
public void perform(Control c1, Control c2, int span) {
perform(new Control[] {c1, c2}, span);
}
public void perform(Control c1, Control c2, Control c3, int span) {
perform(new Control[] {c1, c2, c3}, span);
}
public void perform(Control[] controls, int spanColumn) {
int numColumns= numColumns();
Assert.isTrue(controls.length <= numColumns);
order(controls);
int gridIndex= 0;
for (int i= 0; i < controls.length; i++) {
Control control= controls[i];
GridData gd= (GridData)control.getLayoutData();
if (gd == null)
gd= getGridData(gridIndex);
if (i == spanColumn) {
int span= numColumns - (controls.length - 1);
gridIndex+= span;
if (gd == null)
gd= new GridData();
applyDelta(gd);
gd.horizontalSpan= span;
} else {
gridIndex++;
}
control.setLayoutData(gd);
}
}
private void applyDelta(GridData gd) {
if (spanHorizontalAlignment != -1)
gd.horizontalAlignment= spanHorizontalAlignment;
if (spanGrabExcessHorizontalSpace != -1) {
if (spanGrabExcessHorizontalSpace == 0)
gd.grabExcessHorizontalSpace= false;
else
gd.grabExcessHorizontalSpace= true;
}
if (spanHorizontalSpan != -1)
gd.horizontalSpan= spanHorizontalSpan;
if (spanHorizontalIndent != -1)
gd.horizontalIndent= spanHorizontalIndent;
if (spanWidthHint != -1)
gd.widthHint= spanWidthHint;
if (spanVerticalAlignment != -1)
gd.verticalAlignment= spanVerticalAlignment;
if (spanGrabExcessVerticalSpace != -1) {
if (spanGrabExcessVerticalSpace == 0)
gd.grabExcessVerticalSpace= false;
else
gd.grabExcessVerticalSpace= true;
}
if (spanVerticalSpan != -1)
gd.verticalSpan= spanVerticalSpan;
if (spanHeightHint != -1)
gd.heightHint= spanHeightHint;
}
public void setDefaultGridData(GridData gd, int index) {
if (index >= fDefaultGridDatas.length) {
GridData[] newDatas= new GridData[index + 4];
System.arraycopy(fDefaultGridDatas, 0, newDatas, 0, fDefaultGridDatas.length);
fDefaultGridDatas= newDatas;
}
fDefaultGridDatas[index]= gd;
}
public GridData getGridData(int index) {
if (index > fDefaultGridDatas.length)
return null;
return cloneGridData(fDefaultGridDatas[index]);
}
public int numColumns() {
return fNumColumns;
}
protected void order(Control[] controls) {
if (!fOrder)
return;
for (int i= 0; i < controls.length; i++) {
Control control= controls[i];
control.moveBelow(fLastControl);
fLastControl= control;
}
}
protected GridData cloneGridData(GridData gd) {
if (gd == null)
return null;
GridData result= new GridData();
result.horizontalAlignment= gd.horizontalAlignment;
result.grabExcessHorizontalSpace= gd.grabExcessHorizontalSpace;
result.horizontalSpan= gd.horizontalSpan;
result.horizontalIndent= gd.horizontalIndent;
result.widthHint= gd.widthHint;
result.verticalAlignment= gd.verticalAlignment;
result.grabExcessVerticalSpace= gd.grabExcessVerticalSpace;
result.verticalSpan= gd.verticalSpan;
result.heightHint= gd.heightHint;
return result;
}
}
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