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package org.eclipse.swt.custom;
/*
* Licensed Materials - Property of IBM,
* (c) Copyright IBM Corp. 1998, 2001 All Rights Reserved
*/
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.*;
/**
* This Layout stacks all the controls one on top of the other and resizes all controls
* to have the same size and location.
* The control specified in topControl is visible and all other controls are not visible.
* Users must set the topControl value to flip between the visible items and the call
* layout() on the composite which has the StackLayout.
*/
public class StackLayout extends Layout {
/**
* marginWidth specifies the number of pixels of horizontal margin
* that will be placed along the left and right edges of the layout.
*
* The default value is 0.
*/
public int marginWidth = 0;
/**
* marginHeight specifies the number of pixels of vertical margin
* that will be placed along the top and bottom edges of the layout.
*
* The default value is 0.
*/
public int marginHeight = 0;
/**
* topControl the Control that is displayed at the top of the stack.
* All other controls that are children of the parent composite will not be visible.
*/
public Control topControl;
protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) {
Control children[] = composite.getChildren();
int maxWidth = 0;
int maxHeight = 0;
for (int i = 0; i < children.length; i++) {
Point size = children[i].computeSize(wHint, hHint, flushCache);
maxWidth = Math.max(size.x, maxWidth);
maxHeight = Math.max(size.y, maxHeight);
}
int width = wHint, height = hHint;
if (wHint == SWT.DEFAULT) width = maxWidth;
if (hHint == SWT.DEFAULT) height = maxHeight;
return new Point(width + 2 * marginWidth, height + 2 * marginHeight);
}
protected void layout(Composite composite, boolean flushCache) {
Control children[] = composite.getChildren();
Rectangle rect = composite.getClientArea();
rect.x += marginWidth;
rect.y += marginHeight;
rect.width -= 2 * marginWidth;
rect.height -= 2 * marginHeight;
for (int i = 0; i < children.length; i++) {
children[i].setBounds(rect);
children[i].setVisible(children[i] == topControl);
}
}
}
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