Java tutorial
/*=============================================================================# # Copyright (c) 2005-2015 Stephan Wahlbrink (WalWare.de) 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: # Stephan Wahlbrink - initial API and implementation #=============================================================================*/ package de.walware.ecommons.ui.dialogs.groups; import org.eclipse.jface.viewers.DoubleClickEvent; import org.eclipse.jface.viewers.IContentProvider; import org.eclipse.jface.viewers.IDoubleClickListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.ITreeContentProvider; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.ScrollBar; import org.eclipse.swt.widgets.Scrollable; import de.walware.ecommons.ui.util.PixelConverter; import de.walware.ecommons.ui.util.UIAccess; public abstract class CategorizedOptionsGroup<ItemT extends CategorizedOptionsGroup.CategorizedItem> extends StructuredSelectionOptionsGroup<TreeViewer, ItemT> { public static class CategorizedItem { private int fCategoryIndex; private final String fName; public CategorizedItem(final String name) { fName = name; } public String getName() { return fName; } protected void setCategory(final int index) { fCategoryIndex = index; } public int getCategoryIndex() { return fCategoryIndex; } } private class CategorizedItemLabelProvider extends LabelProvider { @Override public String getText(final Object element) { if (element instanceof String) { return (String) element; } return ((CategorizedItem) element).getName(); // ItemT } } private class CategorizedItemContentProvider implements ITreeContentProvider { @Override public void dispose() { } @Override public void inputChanged(final Viewer viewer, final Object oldInput, final Object newInput) { } @Override public Object[] getElements(final Object inputElement) { return fCategorys; } @Override public boolean hasChildren(final Object element) { return element instanceof String; } @Override public Object[] getChildren(final Object parentElement) { if (parentElement instanceof String) { final int idx = getIndexOfCategory(parentElement); return fCategoryChilds[idx]; } return new Object[0]; } @Override public Object getParent(final Object element) { if (element instanceof String) { return null; } final int idx = ((CategorizedItem) element).getCategoryIndex(); return fCategorys[idx]; } } public String[] fCategorys; public ItemT[][] fCategoryChilds; public CategorizedOptionsGroup(final boolean grabSelectionHorizontal, final boolean grabVertical) { super(grabSelectionHorizontal, grabVertical); } @Override protected TreeViewer createSelectionViewer(final Composite parent) { final TreeViewer viewer = new TreeViewer(parent, SWT.BORDER | SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL); viewer.setLabelProvider(new CategorizedItemLabelProvider()); return viewer; } @Override protected GridData createSelectionGridData() { final GridData gd = super.createSelectionGridData(); final Control control = getStructuredViewer().getControl(); final PixelConverter pixel = new PixelConverter(control); gd.heightHint = pixel.convertHeightInCharsToPixels(9); int maxWidth = 0; for (final CategorizedItem item : getListModel()) { maxWidth = Math.max(maxWidth, pixel.convertWidthInCharsToPixels(item.getName().length())); } final ScrollBar vBar = ((Scrollable) control).getVerticalBar(); if (vBar != null) { maxWidth += vBar.getSize().x * 4; // scrollbars and tree indentation guess } gd.widthHint = maxWidth; return gd; } @Override protected IContentProvider createContentProvider() { return new CategorizedItemContentProvider(); } @Override protected IDoubleClickListener createDoubleClickListener() { return new IDoubleClickListener() { @Override public void doubleClick(final DoubleClickEvent event) { final IStructuredSelection selection = (IStructuredSelection) event.getSelection(); if (selection != null && selection.size() == 1) { final Object item = selection.getFirstElement(); if (item instanceof String) { if (getStructuredViewer().getExpandedState(item)) { getStructuredViewer().collapseToLevel(item, TreeViewer.ALL_LEVELS); } else { getStructuredViewer().expandToLevel(item, 1); } } else { handleDoubleClick(getSingleItem(selection), selection); } } } }; } @Override public void initFields() { super.initFields(); getStructuredViewer().getControl().getDisplay().asyncExec(new Runnable() { @Override public void run() { final TreeViewer viewer = getStructuredViewer(); if (viewer != null && UIAccess.isOkToUse(viewer)) { viewer.setSelection(new StructuredSelection(fCategorys[0])); } } }); } @Override public ItemT getSingleItem(final IStructuredSelection selection) { if (selection.getFirstElement() instanceof String) { return null; } return super.getSingleItem(selection); } public void generateListModel() { for (int i = 0; i < fCategorys.length; i++) { for (int j = 0; j < fCategoryChilds[i].length; j++) { fCategoryChilds[i][j].setCategory(i); getListModel().add(fCategoryChilds[i][j]); } } } public int getIndexOfCategory(final Object category) { for (int i = 0; i < fCategorys.length; i++) { if (fCategorys[i] == category) { return i; } } return -1; } }