83 lines
2.4 KiB
Java
83 lines
2.4 KiB
Java
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package com.foundation.view.swt.layout;
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import org.eclipse.swt.graphics.Point;
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import org.eclipse.swt.graphics.Rectangle;
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import org.eclipse.swt.widgets.Composite;
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import org.eclipse.swt.widgets.Control;
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/**
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* A very simple layout that centers the first child within the parent.
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* All other children are not visible.
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* There is no data attached to the children that is used by this layout.
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*/
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public class CenterLayout extends Layout {
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private Point size = new Point(0, 0);
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private Point firstChildSize = new Point(0, 0);
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/**
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* CenterLayout constructor.
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*/
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public CenterLayout() {
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}//CenterLayout()//
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/* (non-Javadoc)
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* @see org.eclipse.swt.widgets.Layout#computeSize(org.eclipse.swt.widgets.Composite, int, int, boolean)
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*/
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protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) {
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if(flushCache) {
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Control[] children = composite.getChildren();
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size.x = 0;
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size.y = 0;
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firstChildSize.x = 0;
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firstChildSize.y = 0;
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if(children != null) {
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for(int index = 0; index < children.length; index++) {
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Point childSize = children[index].computeSize(wHint, hHint, flushCache);
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size.x = Math.max(childSize.x, size.x);
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size.y = Math.max(childSize.y, size.y);
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if(index == 0) {
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firstChildSize.x = childSize.x;
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firstChildSize.y = childSize.y;
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}//if//
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}//for//
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}//if//
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}//if//
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return new Point(size.x, size.y);
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}//computeSize()//
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/* (non-Javadoc)
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* @see org.eclipse.swt.widgets.Layout#layout(org.eclipse.swt.widgets.Composite, boolean)
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*/
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protected void layout(Composite composite, boolean flushCache) {
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Rectangle space = composite.getClientArea();
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Control[] children = composite.getChildren();
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if(flushCache || firstChildSize.x == 0 || firstChildSize.y == 0) {
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if(children != null && children.length > 0) {
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Point childSize = children[0].computeSize(-1, -1, true);
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firstChildSize.x = childSize.x;
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firstChildSize.y = childSize.y;
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}//if//
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else {
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firstChildSize.x = 0;
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firstChildSize.y = 0;
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}//else//
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}//if//
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if(children != null) {
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for(int index = 0; index < children.length; index++) {
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if(index == 0) {
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children[index].setSize(firstChildSize);
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children[index].setLocation(space.x + ((space.width - firstChildSize.x) >> 1), space.y + ((space.height - firstChildSize.y) >> 1));
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}//if//
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else {
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children[index].setSize(0, 0);
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children[index].setLocation(0, 0);
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}//else//
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}//for//
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}//if//
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}//layout()//
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}//CenterLayout//
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