Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2003 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package net.sourceforge.eclipseccase.ui; import java.util.*; import java.util.List; import org.eclipse.jface.dialogs.*; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.util.IPropertyChangeListener; import org.eclipse.jface.util.PropertyChangeEvent; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.FontMetrics; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.*; /** * This class provides facilities to allow common widget groupings to be shared * by mulitple dialogs or wizards. */ public abstract class DialogArea { protected static final int LABEL_WIDTH_HINT = 400; protected Dialog parentDialog; protected FontMetrics fontMetrics; protected IDialogSettings settings; protected List listeners; public DialogArea(Dialog parentDialog, IDialogSettings settings) { this.listeners = new ArrayList(); this.parentDialog = parentDialog; this.settings = settings; } /** * Listener for property change events. The only event of interest is for * property SELECTED_WORKING_SET which contains the selected working set or * <code>null</code> if none is selected. * * @param listener */ public void addPropertyChangeListener(IPropertyChangeListener listener) { if (!listeners.contains(listener)) { listeners.add(listener); } } /** * Remove the provided listener from the receiver. * * @param listener */ public void removePropertyChangeListener(IPropertyChangeListener listener) { listeners.remove(listener); } protected void firePropertyChangeChange(String property, Object oldValue, Object newValue) { PropertyChangeEvent event = new PropertyChangeEvent(this, property, oldValue, newValue); for (Iterator iter = listeners.iterator(); iter.hasNext();) { IPropertyChangeListener listener = (IPropertyChangeListener) iter.next(); listener.propertyChange(event); } } /** * Code copied from <code>org.eclipse.jface.dialogs.Dialog</code> to obtain * a FontMetrics. * * @param control * a control from which to obtain the current font * * @see org.eclipse.jface.dialogs.Dialog */ protected void initializeDialogUnits(Control control) { // Compute and store a font metric GC gc = new GC(control); gc.setFont(control.getFont()); fontMetrics = gc.getFontMetrics(); gc.dispose(); } public abstract Control createArea(Composite parent); /** * Returns the shell. * * @return Shell */ protected Shell getShell() { return parentDialog.getShell(); } protected Button createCheckbox(Composite parent, String label, int span) { Button button = new Button(parent, SWT.CHECK | SWT.LEFT); button.setText(label); button.setFont(parent.getFont()); GridData data = new GridData(); data.horizontalSpan = span; button.setLayoutData(data); return button; } protected Button createButton(Composite parent, String label, int style) { Button button = new Button(parent, SWT.PUSH); button.setText(label); // we need to explicitly set the font to the parent's font for dialogs button.setFont(parent.getFont()); GridData data = new GridData(style); data.heightHint = Dialog.convertVerticalDLUsToPixels(fontMetrics, IDialogConstants.BUTTON_HEIGHT); int widthHint = Dialog.convertHorizontalDLUsToPixels(fontMetrics, IDialogConstants.BUTTON_WIDTH); data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x); button.setLayoutData(data); return button; } protected Button createRadioButton(Composite parent, String label, int span) { Button button = new Button(parent, SWT.RADIO); button.setText(label); GridData data = new GridData(); data.horizontalSpan = span; button.setLayoutData(data); return button; } protected Label createWrappingLabel(Composite parent, String text, int horizontalSpan) { Label label = new Label(parent, SWT.LEFT | SWT.WRAP); label.setText(text); label.setFont(parent.getFont()); GridData data = new GridData(); data.horizontalSpan = horizontalSpan; data.horizontalAlignment = GridData.FILL; data.grabExcessHorizontalSpace = true; data.widthHint = LABEL_WIDTH_HINT; label.setLayoutData(data); return label; } /** * Creates composite control and sets the default layout data. * * @param parent * the parent of the new composite * @param numColumns * the number of columns for the new composite * @return the newly-created coposite */ protected Composite createComposite(Composite parent, int numColumns) { Composite composite = new Composite(parent, SWT.NULL); composite.setFont(parent.getFont()); // GridLayout GridLayout layout = new GridLayout(); layout.numColumns = numColumns; composite.setLayout(layout); // GridData GridData data = new GridData(); data.verticalAlignment = GridData.FILL; data.horizontalAlignment = GridData.FILL; composite.setLayoutData(data); return composite; } /** * Creates composite control and sets the default layout data. * * @param parent * the parent of the new composite * @param numColumns * the number of columns for the new composite * @return the newly-created coposite */ protected Composite createGrabbingComposite(Composite parent, int numColumns) { Composite composite = new Composite(parent, SWT.NULL); composite.setFont(parent.getFont()); // GridLayout GridLayout layout = new GridLayout(); layout.numColumns = numColumns; composite.setLayout(layout); // GridData GridData data = new GridData(); data.verticalAlignment = GridData.FILL; data.horizontalAlignment = GridData.FILL; data.grabExcessHorizontalSpace = true; data.grabExcessVerticalSpace = true; composite.setLayoutData(data); return composite; } }