Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2009 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: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.debug.internal.ui.preferences; import java.util.HashSet; import java.util.Iterator; import java.util.Set; import org.eclipse.debug.internal.core.IInternalDebugCoreConstants; import org.eclipse.debug.internal.ui.DebugUIPlugin; import org.eclipse.debug.internal.ui.IDebugHelpContextIds; import org.eclipse.debug.internal.ui.IInternalDebugUIConstants; import org.eclipse.debug.internal.ui.SWTFactory; import org.eclipse.debug.internal.ui.views.ViewContextService; import org.eclipse.debug.ui.DebugUITools; import org.eclipse.debug.ui.IDebugUIConstants; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.preference.PreferencePage; import org.eclipse.jface.viewers.CheckboxTableViewer; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.Viewer; import org.eclipse.swt.SWT; 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.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.Table; import org.eclipse.ui.IPerspectiveDescriptor; import org.eclipse.ui.IPerspectiveRegistry; import org.eclipse.ui.IWorkbench; import org.eclipse.ui.IWorkbenchPreferencePage; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.model.PerspectiveLabelProvider; /** * Preference page for configuring the debugger's automatic * view management. */ public class ViewManagementPreferencePage extends PreferencePage implements IWorkbenchPreferencePage { private CheckboxTableViewer fPerspectiveViewer; private Button fTrackViewsButton; private Button fResetViewsButton; // This flag indicates whether or not the user has pressed the reset button private boolean fResetPressed = false; private PerspectiveLabelProvider fLabelProvider = null; private SelectionListener fSelectionListener = new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { Object source = e.getSource(); if (source == fResetViewsButton) { handleResetPressed(); } else if (source == fTrackViewsButton) { handleTrackViewsToggled(); } } }; public ViewManagementPreferencePage() { super(); setTitle(DebugPreferencesMessages.ViewManagementPreferencePage_1); setDescription(DebugPreferencesMessages.ViewManagementPreferencePage_0); setPreferenceStore(DebugUITools.getPreferenceStore()); } /* (non-Javadoc) * @see org.eclipse.jface.preference.PreferencePage#createControl(org.eclipse.swt.widgets.Composite) */ public void createControl(Composite parent) { super.createControl(parent); PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), IDebugHelpContextIds.VIEW_MANAGEMENT_PREFERENCE_PAGE); } /* (non-Javadoc) * @see org.eclipse.jface.preference.PreferencePage#createContents(org.eclipse.swt.widgets.Composite) */ protected Control createContents(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); composite.setLayout(new GridLayout()); composite.setLayoutData(new GridData(GridData.FILL_BOTH)); composite.setFont(parent.getFont()); createPerspectiveViewer(composite); createViewTrackingOptions(composite); Dialog.applyDialogFont(composite); return composite; } /** * @param composite */ private void createViewTrackingOptions(Composite composite) { fTrackViewsButton = new Button(composite, SWT.CHECK); fTrackViewsButton.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); fTrackViewsButton.setText(DebugPreferencesMessages.ViewManagementPreferencePage_3); fTrackViewsButton.setSelection( DebugUITools.getPreferenceStore().getBoolean(IInternalDebugUIConstants.PREF_TRACK_VIEWS)); fTrackViewsButton.addSelectionListener(fSelectionListener); Label label = new Label(composite, SWT.WRAP); label.setText(DebugPreferencesMessages.ViewManagementPreferencePage_4); label.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); fResetViewsButton = SWTFactory.createPushButton(composite, DebugPreferencesMessages.ViewManagementPreferencePage_5, null); ((GridData) fResetViewsButton.getLayoutData()).horizontalAlignment = GridData.BEGINNING; fResetViewsButton.addSelectionListener(fSelectionListener); updateResetButton(); } private void handleResetPressed() { fResetPressed = true; fResetViewsButton.setEnabled(false); } protected void handleTrackViewsToggled() { if (fTrackViewsButton.getSelection()) { // When toggled on, possibly re-enable the reset button updateResetButton(); } else { // When toggled off, disable the reset button fResetViewsButton.setEnabled(false); } } /** * @param parent */ private void createPerspectiveViewer(Composite parent) { Label label = new Label(parent, SWT.WRAP); label.setText(DebugPreferencesMessages.ViewManagementPreferencePage_2); label.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); Table table = new Table(parent, SWT.CHECK | SWT.BORDER | SWT.MULTI | SWT.FULL_SELECTION); table.setLayout(new GridLayout()); table.setLayoutData(new GridData(GridData.FILL_BOTH)); fPerspectiveViewer = new CheckboxTableViewer(table); PerspectiveProvider provider = new PerspectiveProvider(); fPerspectiveViewer.setContentProvider(provider); fLabelProvider = new PerspectiveLabelProvider(); fPerspectiveViewer.setLabelProvider(fLabelProvider); fPerspectiveViewer.setInput(this); Set perspectives; String preference = DebugUIPlugin.getDefault().getPreferenceStore() .getString(IDebugUIConstants.PREF_MANAGE_VIEW_PERSPECTIVES); if (IDebugUIConstants.PREF_MANAGE_VIEW_PERSPECTIVES_DEFAULT.equals(preference)) { perspectives = ViewContextService.getDefaultEnabledPerspectives(); } else { perspectives = ViewContextService.parseList(preference); } checkPerspectives(perspectives); } private void checkPerspectives(Set perspectives) { fPerspectiveViewer.setAllChecked(false); IPerspectiveRegistry registry = PlatformUI.getWorkbench().getPerspectiveRegistry(); Iterator perspectiveIds = perspectives.iterator(); while (perspectiveIds.hasNext()) { IPerspectiveDescriptor descriptor = registry.findPerspectiveWithId((String) perspectiveIds.next()); if (descriptor != null) { fPerspectiveViewer.setChecked(descriptor, true); } } } /* (non-Javadoc) * @see org.eclipse.jface.preference.IPreferencePage#performOk() */ public boolean performOk() { Object[] descriptors = fPerspectiveViewer.getCheckedElements(); Set perspectives = new HashSet(); for (int i = 0; i < descriptors.length; i++) { perspectives.add(((IPerspectiveDescriptor) descriptors[i]).getId()); } if (perspectives.equals(ViewContextService.getDefaultEnabledPerspectives())) { getPreferenceStore().setValue(IDebugUIConstants.PREF_MANAGE_VIEW_PERSPECTIVES, IDebugUIConstants.PREF_MANAGE_VIEW_PERSPECTIVES_DEFAULT); } else { StringBuffer buffer = new StringBuffer(); for (Iterator itr = perspectives.iterator(); itr.hasNext();) { buffer.append(itr.next()).append(','); } getPreferenceStore().setValue(IDebugUIConstants.PREF_MANAGE_VIEW_PERSPECTIVES, buffer.toString()); } boolean trackViews = fTrackViewsButton.getSelection(); getPreferenceStore().setValue(IInternalDebugUIConstants.PREF_TRACK_VIEWS, trackViews); if (fResetPressed || !trackViews) { // Reset if the user has pressed reset or chosen to no longer track views getPreferenceStore().setValue(IInternalDebugUIConstants.PREF_USER_VIEW_BINDINGS, IInternalDebugCoreConstants.EMPTY_STRING); } return super.performOk(); } /* (non-Javadoc) * @see org.eclipse.jface.preference.PreferencePage#performDefaults() */ protected void performDefaults() { checkPerspectives(ViewContextService.getDefaultEnabledPerspectives()); fTrackViewsButton .setSelection(getPreferenceStore().getDefaultBoolean(IInternalDebugUIConstants.PREF_TRACK_VIEWS)); fResetPressed = false; updateResetButton(); super.performDefaults(); } /* (non-Javadoc) * @see org.eclipse.ui.IWorkbenchPreferencePage#init(org.eclipse.ui.IWorkbench) */ public void init(IWorkbench workbench) { } /** * Updates enablement of the reset button. * Enable if either persisted view collection is not empty. * Always disable if "track views" is turned off. */ private void updateResetButton() { boolean enableReset = !IInternalDebugCoreConstants.EMPTY_STRING .equals(getPreferenceStore().getString(IInternalDebugUIConstants.PREF_USER_VIEW_BINDINGS)); // Only enable the button if there are views to clear, the user hasn't pressed the reset // button, and the option to "track views" is turned on. fResetViewsButton.setEnabled(enableReset && !fResetPressed && fTrackViewsButton.getSelection()); } private static class PerspectiveProvider implements IStructuredContentProvider { /* (non-Javadoc) * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object) */ public Object[] getElements(Object inputElement) { return PlatformUI.getWorkbench().getPerspectiveRegistry().getPerspectives(); } /* (non-Javadoc) * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object) */ public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } /* (non-Javadoc) * @see org.eclipse.jface.viewers.IContentProvider#dispose() */ public void dispose() { } } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.IDialogPage#dispose() */ public void dispose() { super.dispose(); if (fLabelProvider != null) { fLabelProvider.dispose(); } } }