terminal/plugins/org.eclipse.tm.terminal/src/org/eclipse/tm/internal/terminal/emulator/EditActionAccelerators.java

/*******************************************************************************
 * Copyright (c) 2013 Wind River Systems, Inc. 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
 *******************************************************************************/

package org.eclipse.tm.internal.terminal.emulator;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.jface.bindings.TriggerSequence;
import org.eclipse.jface.bindings.keys.KeySequence;
import org.eclipse.jface.bindings.keys.KeyStroke;
import org.eclipse.jface.bindings.keys.SWTKeySupport;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.keys.IBindingService;

class EditActionAccelerators {
	private static final String COPY_COMMAND_ID = "org.eclipse.tm.terminal.copy";
	private static final String PASTE_COMMAND_ID = "org.eclipse.tm.terminal.paste";

	private final Map commandIdsByAccelerator = new HashMap();

	private void load() {
		addAccelerator(COPY_COMMAND_ID);
		addAccelerator(PASTE_COMMAND_ID);
	}

	private void addAccelerator(String commandId) {
		KeySequence keySequence = bindingFor(commandId);
		if (keySequence == null) {
			return;
		}
		KeyStroke[] keyStrokes = keySequence.getKeyStrokes();
		if (keyStrokes.length != 0) {
			int accelerator = SWTKeySupport.convertKeyStrokeToAccelerator(keyStrokes[0]);
			commandIdsByAccelerator.put(new Integer(accelerator), commandId);
		}
	}

	private static KeySequence bindingFor(String commandId) {
		IBindingService bindingService = bindingService();
		TriggerSequence binding = bindingService.getBestActiveBindingFor(commandId);
		if (binding instanceof KeySequence) {
			KeySequence keySequence = (KeySequence) binding;
			return keySequence;
		}
		return null;
	}

	private static IBindingService bindingService() {
		return (IBindingService) PlatformUI.getWorkbench().getAdapter(IBindingService.class);
	}

	boolean isCopyAction(int accelerator) {
		return isMatchingAction(accelerator, COPY_COMMAND_ID);
	}

	boolean isPasteAction(int accelerator) {
		return isMatchingAction(accelerator, PASTE_COMMAND_ID);
	}

	private boolean isMatchingAction(int accelerator, String commandId) {
		if (commandIdsByAccelerator.isEmpty()) {
			load();
		}
		return commandId.equals(commandIdsByAccelerator.get(new Integer(accelerator)));
	}
}