core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/callhierarchy/HistoryListAction.java

/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.callhierarchy;

import java.util.Arrays;
import java.util.List;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.dltk.core.IMethod;
import org.eclipse.dltk.internal.ui.wizards.dialogfields.DialogField;
import org.eclipse.dltk.internal.ui.wizards.dialogfields.IListAdapter;
import org.eclipse.dltk.internal.ui.wizards.dialogfields.LayoutUtil;
import org.eclipse.dltk.internal.ui.wizards.dialogfields.ListDialogField;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.dltk.ui.ModelElementLabelProvider;
import org.eclipse.dltk.ui.dialogs.StatusInfo;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.StatusDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.window.Window;
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.Shell;


public class HistoryListAction extends Action {

	private class HistoryListDialog extends StatusDialog {

		private ListDialogField fHistoryList;
		private IStatus fHistoryStatus;
		private IMethod fResult;

		private HistoryListDialog(Shell shell, IMethod[] elements) {
			super(shell);
			setTitle(CallHierarchyMessages.HistoryListDialog_title);

			String[] buttonLabels= new String[] {
				CallHierarchyMessages.HistoryListDialog_remove_button,
			};

			IListAdapter adapter= new IListAdapter() {
				@Override
				public void customButtonPressed(ListDialogField field, int index) {
					doCustomButtonPressed();
				}
				@Override
				public void selectionChanged(ListDialogField field) {
					doSelectionChanged();
				}

				@Override
				public void doubleClicked(ListDialogField field) {
					doDoubleClicked();
				}
			};

			ModelElementLabelProvider labelProvider= new ModelElementLabelProvider(ModelElementLabelProvider.SHOW_QUALIFIED | ModelElementLabelProvider.SHOW_ROOT);

			fHistoryList= new ListDialogField(adapter, buttonLabels, labelProvider);
			fHistoryList.setLabelText(CallHierarchyMessages.HistoryListDialog_label);
			fHistoryList.setElements(Arrays.asList(elements));

			ISelection sel;
			if (elements.length > 0) {
				sel= new StructuredSelection(elements[0]);
			} else {
				sel= new StructuredSelection();
			}

			fHistoryList.selectElements(sel);
		}


		@Override
		protected Control createDialogArea(Composite parent) {
			initializeDialogUnits(parent);

			Composite composite= (Composite) super.createDialogArea(parent);

			Composite inner= new Composite(composite, SWT.NONE);
			inner.setLayoutData(new GridData(GridData.FILL_BOTH));
			inner.setFont(composite.getFont());

			LayoutUtil.doDefaultLayout(inner, new DialogField[] { fHistoryList }, true, 0, 0);
			LayoutUtil.setHeightHint(fHistoryList.getListControl(null), convertHeightInCharsToPixels(12));
			LayoutUtil.setHorizontalGrabbing(fHistoryList.getListControl(null));

			applyDialogFont(composite);
			return composite;
		}

		/**
		 * Method doCustomButtonPressed.
		 */
		private void doCustomButtonPressed() {
			fHistoryList.removeElements(fHistoryList.getSelectedElements());
		}

		private void doDoubleClicked() {
			if (fHistoryStatus.isOK()) {
				okPressed();
			}
		}


		private void doSelectionChanged() {
        	StatusInfo status= new StatusInfo();
        	List selected= fHistoryList.getSelectedElements();
        	if (selected.size() != 1) {
        		status.setError(""); //$NON-NLS-1$
        		fResult= null;
        	} else {
        		fResult= (IMethod) selected.get(0);
        	}
        	fHistoryList.enableButton(0, fHistoryList.getSize() > selected.size() && selected.size() != 0);
        	fHistoryStatus= status;
        	updateStatus(status);
        }

		public IMethod getResult() {
			return fResult;
		}

		public IMethod[] getRemaining() {
			List elems= fHistoryList.getElements();
			return (IMethod[]) elems.toArray(new IMethod[elems.size()]);
		}

		@Override
		protected void configureShell(Shell newShell) {
			super.configureShell(newShell);
//			PlatformUI.getWorkbench().getHelpSystem().setHelp(newShell, IJavaHelpContextIds.HISTORY_LIST_DIALOG);
			if (DLTKCore.DEBUG) {
				System.err.println("Add help support here..."); //$NON-NLS-1$
			}

		}

		@Override
		public void create() {
			setShellStyle(getShellStyle() | SWT.RESIZE);
			super.create();
		}

	}

	private CallHierarchyViewPart fView;

	public HistoryListAction(CallHierarchyViewPart view) {
		fView= view;
		setText(CallHierarchyMessages.HistoryListAction_label);
//		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.HISTORY_LIST_ACTION);
		if (DLTKCore.DEBUG) {
			System.err.println("Add help support here..."); //$NON-NLS-1$
		}

	}

	@Override
	public void run() {
		IMethod[] historyEntries= fView.getHistoryEntries();
		HistoryListDialog dialog= new HistoryListDialog(DLTKUIPlugin.getActiveWorkbenchShell(), historyEntries);
		if (dialog.open() == Window.OK) {
			fView.setHistoryEntries(dialog.getRemaining());
			fView.setMethod(dialog.getResult());
		}
	}

}