Java tutorial
/******************************************************************************* * Copyright (c) 2001, 2008 IBM Corporation and others. * 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: * Rational Software - initial implementation *******************************************************************************/ package org.eclipse.cdt.internal.ui.wizards.dialogfields; import java.io.File; import org.eclipse.cdt.internal.ui.wizards.NewWizardMessages; import org.eclipse.cdt.ui.CUIPlugin; import org.eclipse.core.resources.IPathVariableManager; import org.eclipse.core.resources.IResource; import org.eclipse.core.resources.IWorkspace; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Path; import org.eclipse.core.runtime.Status; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.DirectoryDialog; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.FileDialog; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Text; /** * This class is part of the NewClassWizard. * It handles the Link to file part. */ public class LinkToFileGroup extends StringButtonDialogField { protected Listener listener; private String initialLinkTarget; private int type; protected boolean createLink = false; // used to compute layout sizes //private FontMetrics fontMetrics; // widgets //private Composite groupComposite; protected Text linkTargetField; protected Button linkButton; protected Button browseButton; private Label resolvedPathLabelText; private Label resolvedPathLabelData; boolean preventDialogFieldChanged = false; public LinkToFileGroup(IStringButtonAdapter adapter, Listener listener) { super(adapter); this.listener = listener; this.type = IResource.FILE; } @Override public Control[] doFillIntoGrid(Composite parent, int nColumns) { assertEnoughColumns(nColumns); //initializeDialogUnits(parent); Label label = getLabelControl(parent); label.setLayoutData(gridDataForLabel(1)); getLinkCheckButtonControl(parent); Text text = getTextControl(parent); text.setLayoutData(gridDataForText(2)); Button browseButton = getBrowseButtonControl(parent); browseButton.setLayoutData(gridDataForButton(browseButton, 1)); DialogField.createEmptySpace(parent); resolvedPathLabelText = new Label(parent, SWT.SINGLE); resolvedPathLabelText.setText(NewWizardMessages.CreateLinkedResourceGroup_resolvedPathLabel); resolvedPathLabelText.setVisible(true); resolvedPathLabelData = new Label(parent, SWT.SINGLE); GridData data = new GridData(GridData.FILL_HORIZONTAL); data.horizontalSpan = 3; resolvedPathLabelData.setLayoutData(data); resolvedPathLabelData.setVisible(true); return null; } /* * @see DialogField#getNumberOfControls */ @Override public int getNumberOfControls() { return 4; } public Button getLinkCheckButtonControl(Composite parent) { if (linkButton == null) { linkButton = new Button(parent, SWT.CHECK); linkButton.setText(NewWizardMessages.NewClassWizardPage_files_linkFileButton); linkButton.setSelection(createLink); linkButton.setFont(parent.getFont()); SelectionListener selectionListener = new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { createLink = linkButton.getSelection(); browseButton.setEnabled(createLink); linkTargetField.setEnabled(createLink); resolveVariable(); if (listener != null) listener.handleEvent(new Event()); if (!preventDialogFieldChanged) dialogFieldChanged(); } }; linkButton.addSelectionListener(selectionListener); } return linkButton; } @Override public String getText() { return linkTargetField.getText(); } @Override public void setText(String text) { if (isOkToUse(linkTargetField)) { preventDialogFieldChanged = true; linkTargetField.setText(text); preventDialogFieldChanged = false; } // dialogFieldChanged(); } @Override public Text getTextControl(Composite parent) { if (linkTargetField == null) { assertCompositeNotNull(parent); linkTargetField = new Text(parent, SWT.BORDER); linkTargetField.setFont(parent.getFont()); linkTargetField.setEnabled(createLink); linkTargetField.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { resolveVariable(); if (listener != null) listener.handleEvent(new Event()); if (!preventDialogFieldChanged) dialogFieldChanged(); } }); if (initialLinkTarget != null) linkTargetField.setText(initialLinkTarget); } return linkTargetField; } public static GridData gridDataForText(int span) { GridData data = new GridData(); data.widthHint = IDialogConstants.ENTRY_FIELD_WIDTH; data.horizontalAlignment = GridData.FILL; data.grabExcessHorizontalSpace = false; data.horizontalSpan = span; return data; } public Button getBrowseButtonControl(Composite parent) { // browse button if (browseButton == null) { assertCompositeNotNull(parent); browseButton = new Button(parent, SWT.PUSH); //setButtonLayoutData(browseButton); browseButton.setFont(parent.getFont()); browseButton.setText(NewWizardMessages.CreateLinkedResourceGroup_browseButton); browseButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent event) { handleLinkTargetBrowseButtonPressed(); } }); browseButton.setEnabled(createLink); } return browseButton; } /** * Returns a new status object with the given severity and message. * * @return a new status object with the given severity and message. */ private IStatus createStatus(int severity, String message) { return new Status(severity, CUIPlugin.getPluginId(), severity, message, null); } /** * Returns the link target location entered by the user. * * @return the link target location entered by the user. null if the user * chose not to create a link. */ public String getLinkTarget() { if (createLink && linkTargetField != null && linkTargetField.isDisposed() == false) return linkTargetField.getText(); return null; } public String getResolvedPath() { if (createLink && resolvedPathLabelData != null && resolvedPathLabelData.isDisposed() == false) return resolvedPathLabelData.getText(); return null; } /** * Opens a file or directory browser depending on the link type. */ protected void handleLinkTargetBrowseButtonPressed() { String linkTargetName = linkTargetField.getText(); File file = null; String selection = null; if ("".equals(linkTargetName) == false) { //$NON-NLS-1$ file = new File(linkTargetName); if (file.exists() == false) file = null; } if (type == IResource.FILE) { FileDialog dialog = new FileDialog(linkTargetField.getShell()); dialog.setText(NewWizardMessages.CreateLinkedResourceGroup_open); if (file != null) { if (file.isFile()) dialog.setFileName(linkTargetName); else dialog.setFilterPath(linkTargetName); } selection = dialog.open(); } else { DirectoryDialog dialog = new DirectoryDialog(linkTargetField.getShell()); dialog.setText(NewWizardMessages.CreateLinkedResourceGroup_open); if (file != null) { if (file.isFile()) linkTargetName = file.getParent(); if (linkTargetName != null) dialog.setFilterPath(linkTargetName); } dialog.setMessage(NewWizardMessages.CreateLinkedResourceGroup_targetSelectionLabel); selection = dialog.open(); } if (selection != null) { linkTargetField.setText(selection); if (!preventDialogFieldChanged) dialogFieldChanged(); } } /** * Tries to resolve the value entered in the link target field as * a variable, if the value is a relative path. * Displays the resolved value if the entered value is a variable. */ protected void resolveVariable() { if (!linkTargetField.isEnabled()) { resolvedPathLabelData.setText(""); //$NON-NLS-1$ return; } IPathVariableManager pathVariableManager = ResourcesPlugin.getWorkspace().getPathVariableManager(); IPath path = new Path(linkTargetField.getText()); IPath resolvedPath = pathVariableManager.resolvePath(path); resolvedPathLabelData.setText(resolvedPath.toOSString()); } /** * Sets the value of the link target field * * @param target the value of the link target field */ public void setLinkTarget(String target) { initialLinkTarget = target; if (linkTargetField != null && linkTargetField.isDisposed() == false) { linkTargetField.setText(target); if (!preventDialogFieldChanged) dialogFieldChanged(); } } /** * Validates the type of the given file against the link type specified * in the constructor. * * @param linkTargetFile file to validate * @return IStatus indicating the validation result. IStatus.OK if the * given file is valid. */ private IStatus validateFileType(File linkTargetFile) { if (type == IResource.FILE && linkTargetFile.isFile() == false) { return createStatus(IStatus.ERROR, NewWizardMessages.CreateLinkedResourceGroup_linkTargetNotFile); } else if (type == IResource.FOLDER && linkTargetFile.isDirectory() == false) { return createStatus(IStatus.ERROR, NewWizardMessages.CreateLinkedResourceGroup_linkTargetNotFolder); } return createStatus(IStatus.OK, ""); //$NON-NLS-1$ } /** * Validates this page's controls. * * @return IStatus indicating the validation result. IStatus.OK if the * specified link target is valid given the linkHandle. */ public IStatus validateLinkLocation(IResource linkHandle) { if (linkTargetField == null || linkTargetField.isDisposed()) return createStatus(IStatus.OK, ""); //$NON-NLS-1$ IWorkspace workspace = ResourcesPlugin.getWorkspace(); String linkTargetName = linkTargetField.getText(); IPath path = new Path(linkTargetName); if (createLink == false) return createStatus(IStatus.OK, ""); //$NON-NLS-1$ IStatus locationStatus = workspace.validateLinkLocation(linkHandle, path); if (locationStatus.getSeverity() == IStatus.ERROR) return locationStatus; // use the resolved link target name linkTargetName = resolvedPathLabelData.getText(); path = new Path(linkTargetName); File linkTargetFile = new Path(linkTargetName).toFile(); if (linkTargetFile.exists()) { IStatus fileTypeStatus = validateFileType(linkTargetFile); if (fileTypeStatus.isOK() == false) return fileTypeStatus; } else if (locationStatus.getSeverity() == IStatus.OK) { // locationStatus takes precedence over missing location warning. return createStatus(IStatus.WARNING, NewWizardMessages.CreateLinkedResourceGroup_linkTargetNonExistent); } return locationStatus; } public boolean linkCreated() { return createLink; } }