Java tutorial
/* * Copyright 2011 the original author or authors. * * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 * * 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 org.codehaus.groovy.eclipse.dsl.inferencing.suggestions.ui; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.codehaus.groovy.eclipse.dsl.inferencing.suggestions.MethodParameter; import org.eclipse.jdt.core.IJavaProject; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.viewers.ColumnLabelProvider; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerCell; import org.eclipse.jface.window.Window; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Point; 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.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; /** * * @author Nieraj Singh * @created 2011-05-13 */ public class MethodParameterTable extends AbstractControlManager { enum ColumnTypes { NAME("Name", 300), TYPE("Type", 300); private String label; private int weight; private ColumnTypes(String label, int weight) { this.label = label; this.weight = weight; } public String getLabel() { return label; } public int getWeight() { return weight; } } /** * Should never be null. Use empty list if no arguments are present */ private List<MethodParameter> parameters; private TableViewer viewer; private IJavaProject project; private boolean useNamedArguments; public MethodParameterTable(IJavaProject project, List<MethodParameter> parameters, boolean useNamedArguments) { this.parameters = parameters; if (parameters == null) { this.parameters = new ArrayList<MethodParameter>(); } this.project = project; this.useNamedArguments = useNamedArguments; } protected int getLabelRowColumns() { return 1; } protected IDialogueControlDescriptor[] getTableButtonDescriptors() { return new IDialogueControlDescriptor[] { ControlTypes.ADD, ControlTypes.REMOVE, ControlTypes.EDIT, ControlTypes.UP, ControlTypes.DOWN }; } protected Map<Control, IDialogueControlDescriptor> createOperationButtonArea(Composite parent) { Composite buttons = new Composite(parent, SWT.NONE); GridDataFactory.fillDefaults().align(GridData.CENTER, GridData.BEGINNING).applyTo(buttons); GridLayoutFactory.fillDefaults().applyTo(buttons); IDialogueControlDescriptor[] types = getTableButtonDescriptors(); Map<Control, IDialogueControlDescriptor> opButtons = new HashMap<Control, IDialogueControlDescriptor>(); for (IDialogueControlDescriptor type : types) { Button button = createSelectionButton(buttons, type); if (button != null) { opButtons.put(button, type); } } return opButtons; } protected Button createSelectionButton(Composite parent, IDialogueControlDescriptor type) { if (type == null) { return null; } Button button = new Button(parent, SWT.PUSH); button.setText(type.getLabel()); button.setData(type); Point minSize = button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true); int widthHint = 0; GridDataFactory.fillDefaults().hint(Math.max(widthHint, minSize.x), SWT.DEFAULT).applyTo(button); button.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { Object obj = e.getSource(); if (obj instanceof Button) { IDialogueControlDescriptor descriptor = (IDialogueControlDescriptor) ((Button) obj).getData(); handleButtonSelection(descriptor); } } }); return button; } protected void handleButtonSelection(IDialogueControlDescriptor type) { if (!(type instanceof ControlTypes)) { return; } ControlTypes controlType = (ControlTypes) type; switch (controlType) { case ADD: addElement(); break; case REMOVE: removeElement(); break; case EDIT: editElement(); break; case UP: int selectionIndex = viewer.getTable().getSelectionIndex(); // can only move selection if it is not already at the top if (selectionIndex > 0) { MethodParameter element = parameters.remove(selectionIndex); // selectionIndex will never be less than zero parameters.add(selectionIndex - 1, element); refreshTable(); } break; case DOWN: selectionIndex = viewer.getTable().getSelectionIndex(); // Can only move down if the selection is second to last if (selectionIndex >= 0 && selectionIndex < parameters.size() - 1) { MethodParameter element = parameters.remove(selectionIndex); parameters.add(selectionIndex + 1, element); refreshTable(); } break; } } protected int getViewerConfiguration() { return SWT.BORDER | SWT.MULTI | SWT.FULL_SELECTION | SWT.H_SCROLL | SWT.V_SCROLL; } protected int getViewerHeightHint() { return 200; } protected TableViewer createTableViewer(Composite parent) { Composite treeComposite = new Composite(parent, SWT.NONE); GridDataFactory.fillDefaults().grab(true, true).applyTo(treeComposite); GridLayoutFactory.fillDefaults().applyTo(treeComposite); Table table = new Table(treeComposite, getViewerConfiguration()); GridDataFactory.fillDefaults().grab(true, true).hint(SWT.DEFAULT, getViewerHeightHint()).applyTo(table); viewer = new TableViewer(table); ColumnTypes[] values = ColumnTypes.values(); for (ColumnTypes column : values) { if (column != null) { TableColumn tableColumn = new TableColumn(table, SWT.NONE); tableColumn.setResizable(true); tableColumn.setText(column.getLabel()); tableColumn.setWidth(column.getWeight()); } } table.setHeaderVisible(true); table.setLinesVisible(true); setTableProviders(viewer); return viewer; } protected void setTableProviders(final TableViewer viewer) { viewer.setContentProvider(new IStructuredContentProvider() { public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } public void dispose() { } public Object[] getElements(Object inputElement) { if (inputElement instanceof List) { return ((List<?>) inputElement).toArray(); } return null; } }); viewer.setLabelProvider(new ColumnLabelProvider() { public void update(ViewerCell cell) { Object element = cell.getElement(); int index = cell.getColumnIndex(); cell.setText(getColumnText(element, index)); } public String getColumnText(Object element, int index) { String text = null; if (element instanceof MethodParameter) { ColumnTypes[] values = ColumnTypes.values(); if (index >= 0 && index < values.length) { ColumnTypes type = values[index]; MethodParameter arg = (MethodParameter) element; switch (type) { case NAME: text = arg.getName(); break; case TYPE: text = arg.getType(); break; } } } return text; } }); viewer.setInput(parameters); } protected MethodParameter getSelectedElement() { ISelection selection = viewer.getSelection(); if (selection instanceof IStructuredSelection) { Object selectObj = ((IStructuredSelection) selection).getFirstElement(); if (selectObj instanceof MethodParameter) { return (MethodParameter) selectObj; } } return null; } protected MethodParameter getElement(int index) { if (index < viewer.getTable().getItemCount()) { return getArgumentElementFromSelectionObject(viewer.getElementAt(index)); } return null; } protected void addElement() { MethodParameterDialogue dialogue = new MethodParameterDialogue(getShell(), project, null, parameters); if (dialogue.open() == Window.OK) { MethodParameter parameter = dialogue.getMethodParameter(); if (parameter != null) { int selectionIndex = viewer.getTable().getSelectionIndex(); // Add element at given selection index if (selectionIndex >= 0) { parameters.add(selectionIndex, parameter); } else { parameters.add(parameter); } } refreshTable(); } } protected void editElement() { MethodParameter selected = getSelectedElement(); if (selected != null) { MethodParameterDialogue dialogue = new MethodParameterDialogue(getShell(), project, selected, parameters); if (dialogue.open() == Window.OK) { MethodParameter editedParameter = dialogue.getMethodParameter(); if (editedParameter != null) { int selectionIndex = viewer.getTable().getSelectionIndex(); parameters.remove(selected); // Add element at given selection index if (selectionIndex >= 0) { parameters.add(selectionIndex, editedParameter); } else { parameters.add(editedParameter); } } refreshTable(); } } } protected void removeElement() { MethodParameter selected = getSelectedElement(); if (selected != null) { for (int i = 0; i < parameters.size(); i++) { MethodParameter item = parameters.get(i); if (item.equals(selected)) { parameters.remove(i); } } } refreshTable(); } protected void refreshTable() { viewer.getTable().setFocus(); viewer.setInput(parameters); viewer.refresh(true); } protected MethodParameter getArgumentElementFromSelectionObject(Object element) { MethodParameter arg = null; if (element instanceof MethodParameter) { arg = (MethodParameter) element; } else if (element instanceof TableItem) { TableItem item = (TableItem) element; Object dataOb = item.getData(); if (dataOb instanceof MethodParameter) { arg = (MethodParameter) dataOb; } } return arg; } public void changeControlValue(ControlSelectionEvent event) { // nothing for now } protected Button createCheckButton(Composite parent, IDialogueControlDescriptor type) { if (type == null) { return null; } Button button = new Button(parent, SWT.CHECK); button.setText(type.getLabel()); button.setData(type); Point minSize = button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true); int widthHint = 0; GridDataFactory.fillDefaults().hint(Math.max(widthHint, minSize.x), SWT.DEFAULT).applyTo(button); button.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { Object obj = e.getSource(); if (obj instanceof Button) { notifyControlChange(new Boolean(((Button) obj).getSelection()), (Button) obj); } } }); return button; } protected Map<Control, IDialogueControlDescriptor> createManagedControls(Composite parent) { Composite viewerArea = new Composite(parent, SWT.NONE); GridLayoutFactory.fillDefaults().numColumns(2).equalWidth(false).applyTo(viewerArea); GridDataFactory.fillDefaults().grab(true, true).applyTo(viewerArea); Map<Control, IDialogueControlDescriptor> allControls = new HashMap<Control, IDialogueControlDescriptor>(); TableViewer viewer = createTableViewer(viewerArea); if (viewer != null) { allControls.put(viewer.getTable(), ControlTypes.PARAMETERS); } Map<Control, IDialogueControlDescriptor> buttonControls = createOperationButtonArea(viewerArea); if (buttonControls != null) { allControls.putAll(buttonControls); } Button useNamedButton = createCheckButton(parent, ControlTypes.USE_NAMED_ARGUMENTS); if (useNamedButton != null) { useNamedButton.setSelection(useNamedArguments); allControls.put(useNamedButton, ControlTypes.USE_NAMED_ARGUMENTS); } return allControls; } public List<MethodParameter> getMethodParameter() { return parameters; } }