Java tutorial
/******************************************************************************* * Copyright (c) 2008 xored software, Inc. * * 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: * xored software, Inc. - initial API and Implementation (Alex Panchenko) *******************************************************************************/ package org.eclipse.dltk.ui.formatter; import java.net.URL; import org.eclipse.dltk.ui.util.PixelConverter; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.IDialogSettings; import org.eclipse.jface.text.ITextViewerExtension2; import org.eclipse.jface.text.TextViewer; import org.eclipse.jface.text.WhitespaceCharacterPainter; import org.eclipse.jface.text.source.ISourceViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.SashForm; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.events.ControlAdapter; import org.eclipse.swt.events.ControlEvent; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Layout; public abstract class FormatterModifyTabPage implements IFormatterModifiyTabPage { protected static final String SHOW_INVISIBLE_PREFERENCE_KEY = "invisible.characters"; //$NON-NLS-1$ private final IFormatterModifyDialog dialog; private ISourceViewer previewViewer; /** * @param dialog */ public FormatterModifyTabPage(IFormatterModifyDialog dialog) { this.dialog = dialog; } private Button fShowInvisibleButton; public Composite createContents(IFormatterControlManager manager, Composite parent) { final int numColumns = 4; if (fPixelConverter == null) { fPixelConverter = new PixelConverter(parent); } final SashForm sashForm = new SashForm(parent, SWT.HORIZONTAL); sashForm.setFont(parent.getFont()); Composite scrollContainer = new Composite(sashForm, SWT.NONE); GridData gridData = new GridData(SWT.FILL, SWT.FILL, true, true); scrollContainer.setLayoutData(gridData); GridLayout layout = new GridLayout(2, false); layout.marginHeight = 0; layout.marginWidth = 0; layout.horizontalSpacing = 0; layout.verticalSpacing = 0; scrollContainer.setLayout(layout); ScrolledComposite scroll = new ScrolledComposite(scrollContainer, SWT.V_SCROLL | SWT.H_SCROLL); scroll.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); scroll.setExpandHorizontal(true); scroll.setExpandVertical(true); final Composite settingsContainer = new Composite(scroll, SWT.NONE); settingsContainer.setFont(sashForm.getFont()); scroll.setContent(settingsContainer); settingsContainer.setLayout(new PageLayout(scroll, 400, 400)); settingsContainer.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); Composite settingsPane = new Composite(settingsContainer, SWT.NONE); settingsPane.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); layout = new GridLayout(1, false); layout.verticalSpacing = (int) (1.5 * fPixelConverter.convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING)); layout.horizontalSpacing = fPixelConverter .convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING); layout.marginHeight = fPixelConverter.convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN); layout.marginWidth = fPixelConverter.convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN); settingsPane.setLayout(layout); createOptions(manager, settingsPane); settingsContainer.setSize(settingsContainer.computeSize(SWT.DEFAULT, SWT.DEFAULT)); scroll.addControlListener(new ControlAdapter() { public void controlResized(ControlEvent e) { settingsContainer.setSize(settingsContainer.computeSize(SWT.DEFAULT, SWT.DEFAULT)); } }); Label sashHandle = new Label(scrollContainer, SWT.SEPARATOR | SWT.VERTICAL); gridData = new GridData(SWT.RIGHT, SWT.FILL, false, true); sashHandle.setLayoutData(gridData); final Composite previewPane = new Composite(sashForm, SWT.NONE); previewPane.setLayout(createGridLayout(numColumns, true)); previewPane.setFont(sashForm.getFont()); doCreatePreviewPane(previewPane, numColumns); sashForm.setWeights(new int[] { 3, 3 }); return sashForm; } private WhitespaceCharacterPainter whitespaceCharacterPainter = null; protected void updateShowInvisible(boolean value) { if (value) { if (whitespaceCharacterPainter == null) { whitespaceCharacterPainter = new WhitespaceCharacterPainter(previewViewer); ((ITextViewerExtension2) previewViewer).addPainter(whitespaceCharacterPainter); } } else { if (whitespaceCharacterPainter != null) { ((ITextViewerExtension2) previewViewer).removePainter(whitespaceCharacterPainter); whitespaceCharacterPainter = null; } } } protected Composite doCreatePreviewPane(Composite composite, int numColumns) { createLabel(numColumns - 1, composite, FormatterMessages.FormatterModifyTabPage_preview_label_text); fShowInvisibleButton = new Button(composite, SWT.CHECK); fShowInvisibleButton.setText(FormatterMessages.FormatterModifyTabPage_showInvisible); fShowInvisibleButton.setLayoutData(new GridData(SWT.RIGHT, SWT.TOP, true, false)); fShowInvisibleButton.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { final boolean newValue = fShowInvisibleButton.getSelection(); updateShowInvisible(newValue); getDialogSettings().put(SHOW_INVISIBLE_PREFERENCE_KEY, newValue); } }); previewViewer = dialog.getOwner().createPreview(composite); final boolean savedValue = getDialogSettings().getBoolean(SHOW_INVISIBLE_PREFERENCE_KEY); fShowInvisibleButton.setSelection(savedValue); updateShowInvisible(savedValue); if (previewViewer instanceof TextViewer) { GridData gd = createGridData(numColumns, GridData.FILL_BOTH, 0); gd.widthHint = 100; gd.heightHint = 100; ((TextViewer) previewViewer).getControl().setLayoutData(gd); } return composite; } private IDialogSettings getDialogSettings() { return ((FormatterModifyDialog) dialog).fDialogSettings; } public void updatePreview() { if (previewViewer != null) { FormatterPreviewUtils.updatePreview(previewViewer, getPreviewContent(), dialog.getFormatterFactory(), dialog.getPreferences()); } } protected abstract void createOptions(IFormatterControlManager manager, Composite parent); protected URL getPreviewContent() { return null; } /** * Layout used for the settings part. Makes sure to show scrollbars if * necessary. The settings part needs to be layouted on resize. */ private static class PageLayout extends Layout { private final ScrolledComposite fContainer; private final int fMinimalWidth; private final int fMinimalHight; private PageLayout(ScrolledComposite container, int minimalWidth, int minimalHight) { fContainer = container; fMinimalWidth = minimalWidth; fMinimalHight = minimalHight; } public Point computeSize(Composite composite, int wHint, int hHint, boolean force) { if (wHint != SWT.DEFAULT && hHint != SWT.DEFAULT) { return new Point(wHint, hHint); } int x = fMinimalWidth; int y = fMinimalHight; Control[] children = composite.getChildren(); for (int i = 0; i < children.length; i++) { Point size = children[i].computeSize(SWT.DEFAULT, SWT.DEFAULT, force); x = Math.max(x, size.x); y = Math.max(y, size.y); } Rectangle area = fContainer.getClientArea(); if (area.width > x) { fContainer.setExpandHorizontal(true); } else { fContainer.setExpandHorizontal(false); } if (area.height > y) { fContainer.setExpandVertical(true); } else { fContainer.setExpandVertical(false); } if (wHint != SWT.DEFAULT) { x = wHint; } if (hHint != SWT.DEFAULT) { y = hHint; } return new Point(x, y); } public void layout(Composite composite, boolean force) { Rectangle rect = composite.getClientArea(); Control[] children = composite.getChildren(); for (int i = 0; i < children.length; i++) { children[i].setSize(rect.width, rect.height); } } } /* * Convenience method to create a label. */ protected static Label createLabel(int numColumns, Composite parent, String text) { return createLabel(numColumns, parent, text, GridData.FILL_HORIZONTAL); } /* * Convenience method to create a label */ protected static Label createLabel(int numColumns, Composite parent, String text, int gridDataStyle) { final Label label = new Label(parent, SWT.WRAP); label.setFont(parent.getFont()); label.setText(text); PixelConverter pixelConverter = new PixelConverter(parent); label.setLayoutData( createGridData(numColumns, gridDataStyle, pixelConverter.convertHorizontalDLUsToPixels(150))); return label; } /* * Create a GridLayout with the default margin and spacing settings, as well * as the specified number of columns. */ protected GridLayout createGridLayout(int numColumns, boolean margins) { final GridLayout layout = new GridLayout(numColumns, false); layout.verticalSpacing = fPixelConverter.convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING); layout.horizontalSpacing = fPixelConverter .convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING); if (margins) { layout.marginHeight = fPixelConverter.convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN); layout.marginWidth = fPixelConverter.convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN); } else { layout.marginHeight = 0; layout.marginWidth = 0; } return layout; } /* * Convenience method to create a GridData. */ protected static GridData createGridData(int numColumns, int style, int widthHint) { final GridData gd = new GridData(style); gd.horizontalSpan = numColumns; gd.widthHint = widthHint; return gd; } /** * A pixel converter for layout calculations */ protected PixelConverter fPixelConverter; }