package org.eclipse.swt.custom; | |
/* | |
* (c) Copyright IBM Corp. 2000, 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. | |
* | |
* <p> Here is an example which places ten buttons in a stack layout and | |
* flips between them: | |
* | |
* <pre><code> | |
* public static void main(String[] args) { | |
* Display display = new Display(); | |
* Shell shell = new Shell(display); | |
* shell.setLayout(new GridLayout()); | |
* | |
* final Composite parent = new Composite(shell, SWT.NONE); | |
* parent.setLayoutData(new GridData(GridData.FILL_BOTH)); | |
* final StackLayout layout = new StackLayout(); | |
* parent.setLayout(layout); | |
* final Button[] bArray = new Button[10]; | |
* for (int i = 0; i < 10; i++) { | |
* bArray[i] = new Button(parent, SWT.PUSH); | |
* bArray[i].setText("Button "+i); | |
* } | |
* layout.topControl = bArray[0]; | |
* | |
* Button b = new Button(shell, SWT.PUSH); | |
* b.setText("Show Next Button"); | |
* final int[] index = new int[1]; | |
* b.addListener(SWT.Selection, new Listener(){ | |
* public void handleEvent(Event e) { | |
* index[0] = (index[0] + 1) % 10; | |
* layout.topControl = bArray[index[0]]; | |
* parent.layout(); | |
* } | |
* }); | |
* | |
* shell.open(); | |
* while (shell != null && !shell.isDisposed()) { | |
* if (!display.readAndDispatch()) | |
* display.sleep(); | |
* } | |
* } | |
* </code></pre> | |
*/ | |
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); | |
} | |
} | |
} |