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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.

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/*
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 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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package org.scijava.tool;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.scijava.app.StatusService;
import org.scijava.display.event.DisplayEvent;
import org.scijava.display.event.input.KyPressedEvent;
import org.scijava.display.event.input.KyReleasedEvent;
import org.scijava.display.event.input.MsClickedEvent;
import org.scijava.display.event.input.MsDraggedEvent;
import org.scijava.display.event.input.MsMovedEvent;
import org.scijava.display.event.input.MsPressedEvent;
import org.scijava.display.event.input.MsReleasedEvent;
import org.scijava.display.event.input.MsWheelEvent;
import org.scijava.event.EventHandler;
import org.scijava.event.EventService;
import org.scijava.plugin.AbstractSingletonService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.service.Service;
import org.scijava.tool.event.ToolActivatedEvent;
import org.scijava.tool.event.ToolDeactivatedEvent;

/**
 * Default service for keeping track of available tools, including which tool is
 * active, and delegating UI events to the active tool.
 * 
 * @author Grant Harris
 * @author Curtis Rueden
 * @see Tool
 * @see Tool
 */
@Plugin(type = Service.class)
public class DefaultToolService extends AbstractSingletonService
	implements ToolService
{

	@Parameter
	private EventService eventService;

	@Parameter
	private StatusService statusService;

	private Map alwaysActiveTools;
	private List alwaysActiveToolList;

	private Map tools;
	private List toolList;

	private Tool activeTool;

	// -- ToolService methods --

	@Override
	public Tool getTool(final String name) {
		final Tool alwaysActiveTool = alwaysActiveTools().get(name);
		if (alwaysActiveTool != null) return alwaysActiveTool;
		return tools().get(name);
	}

	@Override
	public List getTools() {
		return toolList();
	}

	@Override
	public List getAlwaysActiveTools() {
		return alwaysActiveToolList();
	}

	@Override
	public Tool getActiveTool() {
		return activeTool();
	}

	@Override
	public void setActiveTool(final Tool activeTool) {
		if (activeTool() == activeTool) return; // nothing to do
		assert this.activeTool != null;
		if (activeTool == null) {
			throw new IllegalArgumentException("Active tool cannot be null");
		}

		// deactivate old tool
		this.activeTool.deactivate();
		eventService.publish(new ToolDeactivatedEvent(this.activeTool));

		// activate new tool
		this.activeTool = activeTool;
		activeTool.activate();
		eventService.publish(new ToolActivatedEvent(activeTool));
	}

	@Override
	public void reportRectangle(final double x, final double y, final double w,
		final double h)
	{
		final DecimalFormat f = new DecimalFormat("0.##");
		final String fx = f.format(x);
		final String fy = f.format(y);
		final String fw = f.format(w);
		final String fh = f.format(h);
		statusService.showStatus("x=" + fx + ", y=" + fy + ", w=" + fw + ", h=" +
			fh);
	}

	@Override
	public void reportLine(final double x1, final double y1, final double x2,
		final double y2)
	{
		// compute line angle
		final double dx = x2 - x1;
		final double dy = y1 - y2;
		final double angle = 180.0 / Math.PI * Math.atan2(dy, dx);

		// compute line length
		final double w = Math.abs(x2 - x1);
		final double h = Math.abs(y2 - y1);
		final double length = Math.sqrt(w * w + h * h);

		final DecimalFormat f = new DecimalFormat("0.##");
		final String fx = f.format(x2);
		final String fy = f.format(y2);
		final String fa = f.format(angle);
		final String fl = f.format(length);
		statusService.showStatus("x=" + fx + ", y=" + fy + ", angle=" + fa +
			", length=" + fl);
	}

	@Override
	public void reportPoint(final double x, final double y) {
		final DecimalFormat f = new DecimalFormat("0.##");
		final String fx = f.format(x);
		final String fy = f.format(y);
		statusService.showStatus("x=" + fx + ", y=" + fy);
	}

	// -- Event handlers --

	@EventHandler
	protected void onEvent(final KyPressedEvent event) {
		if (event.isConsumed()) return;
		final Tool aTool = getActiveTool();
		if (eventOk(event, aTool)) aTool.onKeyDown(event);
		for (final Tool tool : getAlwaysActiveTools()) {
			if (event.isConsumed()) break;
			if (eventOk(event, tool)) tool.onKeyDown(event);
		}
	}

	@EventHandler
	protected void onEvent(final KyReleasedEvent event) {
		if (event.isConsumed()) return;
		final Tool aTool = getActiveTool();
		if (eventOk(event, aTool)) aTool.onKeyUp(event);
		for (final Tool tool : getAlwaysActiveTools()) {
			if (event.isConsumed()) break;
			if (eventOk(event, tool)) tool.onKeyUp(event);
		}
	}

	@EventHandler
	protected void onEvent(final MsPressedEvent event) {
		if (event.isConsumed()) return;
		final Tool aTool = getActiveTool();
		if (eventOk(event, aTool)) aTool.onMouseDown(event);
		for (final Tool tool : getAlwaysActiveTools()) {
			if (event.isConsumed()) break;
			if (eventOk(event, tool)) tool.onMouseDown(event);
		}
	}

	@EventHandler
	protected void onEvent(final MsReleasedEvent event) {
		if (event.isConsumed()) return;
		final Tool aTool = getActiveTool();
		if (eventOk(event, aTool)) aTool.onMouseUp(event);
		for (final Tool tool : getAlwaysActiveTools()) {
			if (event.isConsumed()) break;
			if (eventOk(event, tool)) tool.onMouseUp(event);
		}
	}

	@EventHandler
	protected void onEvent(final MsClickedEvent event) {
		if (event.isConsumed()) return;
		final Tool aTool = getActiveTool();
		if (eventOk(event, aTool)) aTool.onMouseClick(event);
		for (final Tool tool : getAlwaysActiveTools()) {
			if (event.isConsumed()) break;
			if (eventOk(event, tool)) tool.onMouseClick(event);
		}
	}

	@EventHandler
	protected void onEvent(final MsMovedEvent event) {
		if (event.isConsumed()) return;
		final Tool aTool = getActiveTool();
		if (eventOk(event, aTool)) aTool.onMouseMove(event);
		for (final Tool tool : getAlwaysActiveTools()) {
			if (event.isConsumed()) break;
			if (eventOk(event, tool)) tool.onMouseMove(event);
		}
	}

	@EventHandler
	protected void onEvent(final MsDraggedEvent event) {
		if (event.isConsumed()) return;
		final Tool aTool = getActiveTool();
		if (eventOk(event, aTool)) aTool.onMouseDrag(event);
		for (final Tool tool : getAlwaysActiveTools()) {
			if (event.isConsumed()) break;
			if (eventOk(event, tool)) tool.onMouseDrag(event);
		}
	}

	@EventHandler
	protected void onEvent(final MsWheelEvent event) {
		if (event.isConsumed()) return;
		final Tool aTool = getActiveTool();
		if (eventOk(event, aTool)) aTool.onMouseWheel(event);
		for (final Tool tool : getAlwaysActiveTools()) {
			if (event.isConsumed()) break;
			if (eventOk(event, tool)) tool.onMouseWheel(event);
		}
	}

	// -- Helper methods - lazy initialization --

	/** Gets {@link #alwaysActiveTools}, initializing if needed. */
	private Map alwaysActiveTools() {
		if (alwaysActiveTools == null) initAlwaysActiveTools();
		return alwaysActiveTools;
	}

	/** Gets {@link #alwaysActiveToolList}, initializing if needed. */
	private List alwaysActiveToolList() {
		if (alwaysActiveToolList == null) initAlwaysActiveToolList();
		return alwaysActiveToolList;
	}

	/** Gets {@link #tools}, initializing if needed. */
	private Map tools() {
		if (tools == null) initTools();
		return tools;
	}

	/** Gets {@link #toolList}, initializing if needed. */
	private List toolList() {
		if (toolList == null) initToolList();
		return toolList;
	}

	/** Gets {@link #activeTool}, initializing if needed. */
	private Tool activeTool() {
		if (activeTool == null) initActiveTool();
		return activeTool;
	}

	/** Initializes {@link #alwaysActiveTools}. */
	private synchronized void initAlwaysActiveTools() {
		if (alwaysActiveTools != null) return; // already initialized

		final HashMap map = new HashMap<>();
		for (final Tool tool : alwaysActiveToolList()) {
			map.put(tool.getInfo().getName(), tool);
		}

		alwaysActiveTools = map;
	}

	/** Initializes {@link #alwaysActiveToolList}. */
	private synchronized void initAlwaysActiveToolList() {
		if (alwaysActiveToolList != null) return; // already initialized

		final ArrayList list = new ArrayList<>();
		for (final Tool tool : getInstances()) {
			if (!tool.isAlwaysActive()) continue;
			list.add(tool);
		}

		alwaysActiveToolList = list;
	}

	/** Initializes {@link #tools}. */
	private synchronized void initTools() {
		if (tools != null) return; // already initialized

		final HashMap map = new HashMap<>();
		for (final Tool tool : toolList()) {
			map.put(tool.getInfo().getName(), tool);
		}

		tools = map;
	}

	/** Initializes {@link #toolList}. */
	private synchronized void initToolList() {
		if (toolList != null) return; // already initialized

		final ArrayList list = new ArrayList<>();
		for (final Tool tool : getInstances()) {
			if (tool.isAlwaysActive()) continue;
			list.add(tool);
		}

		toolList = list;
	}

	/** Initializes {@link #activeTool}. */
	private synchronized void initActiveTool() {
		if (activeTool != null) return; // already initialized

		final Tool rectangle = getTool("Rectangle");
		final Tool active = rectangle == null ? new DummyTool() : rectangle;

		activeTool = active;
	}

	// -- Helper methods - other --

	/** Checks that an event is OK to be dispatched to a particular tool. */
	private boolean eventOk(final DisplayEvent event, final Tool tool) {
		if (event.getDisplay() != null) return true;
		// NB: An event with a null display came from the main app frame.
		// We only pass these events on to tools flagged with activeInAppFrame.
		return tool.isActiveInAppFrame();
	}

}




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