hexview.java

Eclipse高级编程3源码(书本源码)

/*******************************************************************************
 * Copyright (c) 2004 Berthold Daum. All rights reserved. This program and the
 * accompanying materials are made available under the terms of the Common
 * Public License v1.0 which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors: Berthold Daum
 ******************************************************************************/
package com.bdaum.Hex.views;

import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IStatusLineManager;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.help.WorkbenchHelp;
import org.eclipse.ui.part.ViewPart;

import com.bdaum.Hex.HexHelpConstants;
import com.bdaum.Hex.game.Game;
import com.bdaum.Hex.game.IGame;

public class HexView extends ViewPart implements IStatusListener {
	private class ToggleAction extends Action {
		public ToggleAction(String title, boolean init) {
			super(title, AS_CHECK_BOX);
			setChecked(init);
		}
	}

	/* Action IDs */
	private static final int WHITE_ACTION = 0;

	private static final int BLACK_ACTION = 1;

	private static final int BASIC_ACTION = 2;

	private static final int ADVANCED_ACTION = 3;

	private static final int NEWGAME_ACTION = 4;

	private static final int HELP_ACTION = 5;

	/* Widgets and Actions */
	private Action blackAction, whiteAction, basicAction, advancedAction,
			newGameAction, helpAction;

	private Canvas canvas;

	/* The game engine */
	private IGame game;

	/**
	 * Constructs the view content
	 */
	public void createPartControl(Composite parent) {
		canvas = new Canvas(parent, SWT.NO_BACKGROUND);
		canvas
				.setBackground(parent.getDisplay().getSystemColor(
						SWT.COLOR_GRAY));
		WorkbenchHelp.setHelp(canvas, HexHelpConstants.HELP_BOARD);
		makeActions();
		contributeToActionBars();
		game = new Game();
		game.setStatusListener(this);
		game.setDrawingSurface(canvas);
		game.newGame();
	}

	/**
	 * Create actions
	 */
	private void makeActions() {
		newGameAction = createAction(NEWGAME_ACTION, "New Game",
				"Starts new game", HexHelpConstants.HELP_NEWGAME_ACTION);
		whiteAction = createToggleAction(WHITE_ACTION, "White",
				"Player plays white", HexHelpConstants.HELP_COLOR_ACTION, true);
		blackAction = createToggleAction(BLACK_ACTION, "Black",
				"Player plays black", HexHelpConstants.HELP_COLOR_ACTION, false);
		basicAction = createToggleAction(BASIC_ACTION, "Basic", "Basic Level",
				HexHelpConstants.HELP_LEVEL_ACTION, true);
		advancedAction = createToggleAction(ADVANCED_ACTION, "Advanced",
				"Advanced Level", HexHelpConstants.HELP_LEVEL_ACTION, false);
		helpAction = createAction(HELP_ACTION, "Help", "Help for Hex", null);
	}

	/**
	 * Create single action
	 * 
	 * @param id -
	 *            Identification
	 * @param label -
	 *            Display label
	 * @param tip -
	 *            Tooltip
	 * @param helpId -
	 *            ID for context sensitive help
	 * @return - the created action instance
	 */
	private Action createAction(final int id, String label, String tip,
			String helpId) {
		Action action = new Action() {
			public void run() {
				runAction(id);
			}
		};
		action.setText(label);
		action.setToolTipText(tip);
		if (helpId != null)
			WorkbenchHelp.setHelp(action, helpId);
		return action;
	}

	/**
	 * Create single toggle action
	 * 
	 * @param id -
	 *            Identification
	 * @param label -
	 *            Display label
	 * @param tip -
	 *            Tooltip
	 * @param helpId -
	 *            ID for context sensitive help
	 * @param init -
	 *            initial state
	 * @return - the created action instance
	 */
	private Action createToggleAction(final int id, String label, String tip,
			String helpId, boolean init) {
		Action action = new ToggleAction(label, init) {
			public void run() {
				runAction(id);
			}
		};
		action.setToolTipText(tip);
		if (helpId != null)
			WorkbenchHelp.setHelp(action, helpId);
		return action;
	}

	/**
	 * Run action
	 * 
	 * @param id -
	 *            Action identification
	 */
	protected void runAction(int id) {
		switch (id) {
		case NEWGAME_ACTION:
			game.newGame();
			break;
		case WHITE_ACTION:
			game.setPlayerColor(IGame.WHITE);
			whiteAction.setChecked(true);
			blackAction.setChecked(false);
			break;
		case BLACK_ACTION:
			game.setPlayerColor(IGame.BLACK);
			whiteAction.setChecked(false);
			blackAction.setChecked(true);
			break;
		case BASIC_ACTION:
			game.setLevel(IGame.LEVEL1);
			basicAction.setChecked(true);
			advancedAction.setChecked(false);
			break;
		case ADVANCED_ACTION:
			game.setLevel(IGame.LEVEL2);
			basicAction.setChecked(false);
			advancedAction.setChecked(true);
			break;
		case HELP_ACTION:
			WorkbenchHelp.displayHelp();
			break;
		}
	}

	/**
	 * Construct menu and tool bar
	 */
	private void contributeToActionBars() {
		IActionBars bars = getViewSite().getActionBars();
		fillLocalToolBar(bars.getToolBarManager());
	}

	/**
	 * Construct tool bar
	 * 
	 * @param manager -
	 *            the tool bar manager
	 */
	private void fillLocalToolBar(IToolBarManager manager) {
		manager.add(newGameAction);
		manager.add(new Separator());
		manager.add(whiteAction);
		manager.add(blackAction);
		manager.add(new Separator());
		manager.add(basicAction);
		manager.add(advancedAction);
		manager.add(new Separator());
		manager.add(helpAction);
	}

	/**
	 * Pass focus to Canvas-Widget
	 */
	public void setFocus() {
		canvas.setFocus();
	}

	/**
	 * Display message in status line
	 * 
	 * @param message -
	 *            the message to be displayed
	 */
	public void showMessage(final String message) {
		canvas.getDisplay().asyncExec(new Runnable() {
			public void run() {
				IStatusLineManager sManager = getViewSite().getActionBars()
						.getStatusLineManager();
				sManager.setMessage(message);
			}
		});
	}
}