Java tutorial
/* * Copyright (C) 2012 The Android Open Source Project * * Licensed under the Eclipse Public License, Version 1.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.eclipse.org/org/documents/epl-v10.php * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.ide.eclipse.auidt.internal.wizards.templates; import static com.android.ide.eclipse.auidt.internal.wizards.templates.NewProjectWizard.CATEGORY_ACTIVITIES; import static com.android.ide.eclipse.auidt.internal.wizards.templates.NewProjectWizard.CATEGORY_OTHER; import static com.android.ide.eclipse.auidt.internal.wizards.templates.TemplateHandler.PREVIEW_PADDING; import static com.android.ide.eclipse.auidt.internal.wizards.templates.TemplateHandler.PREVIEW_WIDTH; import com.android.ide.eclipse.auidt.AdtPlugin; import com.android.ide.eclipse.auidt.internal.editors.layout.gle2.ImageControl; import com.google.common.io.Files; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Status; import org.eclipse.jface.dialogs.IMessageProvider; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.wizard.WizardPage; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.Image; 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.Label; import org.eclipse.swt.widgets.List; import java.io.ByteArrayInputStream; import java.io.File; import java.io.IOException; import java.util.ArrayList; class ActivityPage extends WizardPage implements SelectionListener { private final NewProjectWizardState mValues; private List mList; private Button mCreateToggle; private java.util.List<File> mTemplates; private boolean mIgnore; private boolean mShown; private ImageControl mPreview; private Image mPreviewImage; private Label mHeading; private Label mDescription; private boolean mOnlyActivities; private boolean mAskCreate; /** * Create the wizard. */ ActivityPage(NewProjectWizardState values, boolean onlyActivities, boolean askCreate) { super("activityPage"); //$NON-NLS-1$ mValues = values; mOnlyActivities = onlyActivities; mAskCreate = askCreate; if (onlyActivities) { setTitle("Create Activity"); } else { setTitle("Create Android Object"); } if (onlyActivities && askCreate) { setDescription("Select whether to create an activity, and if so, what kind of activity."); } else { setDescription("Select which template to use"); } } @Override public void createControl(Composite parent) { Composite container = new Composite(parent, SWT.NULL); setControl(container); } @SuppressWarnings("unused") // SWT constructors have side effects and aren't unused private void onEnter() { Composite container = (Composite) getControl(); container.setLayout(new GridLayout(3, false)); if (mAskCreate) { mCreateToggle = new Button(container, SWT.CHECK); mCreateToggle.setSelection(true); mCreateToggle.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, false, 3, 1)); mCreateToggle.setText("Create Activity"); mCreateToggle.addSelectionListener(this); } mList = new List(container, SWT.BORDER | SWT.V_SCROLL); mList.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1)); TemplateManager manager = mValues.template.getManager(); mTemplates = manager.getTemplates(CATEGORY_ACTIVITIES); if (!mOnlyActivities) { mTemplates.addAll(manager.getTemplates(CATEGORY_OTHER)); } java.util.List<String> names = new ArrayList<String>(mTemplates.size()); File current = mValues.activityValues.getTemplateLocation(); int index = -1; for (int i = 0, n = mTemplates.size(); i < n; i++) { File template = mTemplates.get(i); names.add(template.getName()); if (template.equals(current)) { index = i; } } String[] items = names.toArray(new String[names.size()]); mList.setItems(items); if (index == -1 && !mTemplates.isEmpty()) { mValues.activityValues.setTemplateLocation(mTemplates.get(0)); index = 0; } if (index >= 0) { mList.setSelection(index); mList.addSelectionListener(this); } // Preview mPreview = new ImageControl(container, SWT.NONE, null); GridData gd_mImage = new GridData(SWT.CENTER, SWT.CENTER, false, false, 1, 1); gd_mImage.widthHint = PREVIEW_WIDTH + 2 * PREVIEW_PADDING; mPreview.setLayoutData(gd_mImage); new Label(container, SWT.NONE); mHeading = new Label(container, SWT.NONE); mHeading.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, false, false, 2, 1)); new Label(container, SWT.NONE); mDescription = new Label(container, SWT.WRAP); mDescription.setLayoutData(new GridData(SWT.LEFT, SWT.CENTER, true, false, 2, 1)); Font font = JFaceResources.getFontRegistry().getBold(JFaceResources.BANNER_FONT); if (font != null) { mHeading.setFont(font); } updatePreview(); } private void updatePreview() { Image oldImage = mPreviewImage; mPreviewImage = null; String title = ""; String description = ""; TemplateHandler handler = mValues.activityValues.getTemplateHandler(); TemplateMetadata template = handler.getTemplate(); if (template != null) { String thumb = template.getThumbnailPath(); if (thumb != null && !thumb.isEmpty()) { File file = new File(mValues.activityValues.getTemplateLocation(), thumb.replace('/', File.separatorChar)); if (file != null) { try { byte[] bytes = Files.toByteArray(file); ByteArrayInputStream input = new ByteArrayInputStream(bytes); mPreviewImage = new Image(getControl().getDisplay(), input); input.close(); } catch (IOException e) { AdtPlugin.log(e, null); } } } title = template.getTitle(); description = template.getDescription(); } mHeading.setText(title); mDescription.setText(description); mPreview.setImage(mPreviewImage); mPreview.fitToWidth(PREVIEW_WIDTH); if (oldImage != null) { oldImage.dispose(); } Composite parent = (Composite) getControl(); parent.layout(true, true); parent.redraw(); } @Override public void dispose() { super.dispose(); if (mPreviewImage != null) { mPreviewImage.dispose(); mPreviewImage = null; } } @Override public void setVisible(boolean visible) { if (visible && !mShown) { onEnter(); } super.setVisible(visible); if (visible) { mShown = true; if (mAskCreate) { try { mIgnore = true; mCreateToggle.setSelection(mValues.createActivity); } finally { mIgnore = false; } } } validatePage(); } private void validatePage() { IStatus status = null; if (mValues.createActivity) { if (mList.getSelectionCount() < 1) { status = new Status(IStatus.ERROR, AdtPlugin.PLUGIN_ID, "Select an activity type"); } else { TemplateHandler templateHandler = mValues.activityValues.getTemplateHandler(); status = templateHandler.validateTemplate(mValues.minSdkLevel); } } setPageComplete(status == null || status.getSeverity() != IStatus.ERROR); if (status != null) { setMessage(status.getMessage(), status.getSeverity() == IStatus.ERROR ? IMessageProvider.ERROR : IMessageProvider.WARNING); } else { setErrorMessage(null); setMessage(null); } } @Override public boolean isPageComplete() { // Ensure that the Finish button isn't enabled until // the user has reached and completed this page if (!mShown) { return false; } return super.isPageComplete(); } // ---- Implements SelectionListener ---- @Override public void widgetSelected(SelectionEvent e) { if (mIgnore) { return; } Object source = e.getSource(); if (source == mCreateToggle) { mValues.createActivity = mCreateToggle.getSelection(); mList.setEnabled(mValues.createActivity); } else if (source == mList) { int index = mList.getSelectionIndex(); if (index >= 0 && index < mTemplates.size()) { File template = mTemplates.get(index); mValues.activityValues.setTemplateLocation(template); updatePreview(); } } validatePage(); } @Override public void widgetDefaultSelected(SelectionEvent e) { } }