org.eclipse.osbp.vaadin.addons.designer.overlay/src/org/eclipse/osbp/vaadin/addons/designer/overlay/client/DesignerExtensionConnector.java

/**
 *                                                                            
 * Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 *                                                                            
 * 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                                 
 *                                                                            
 * Contributors:   
 * Florian Pirchner <florian.pirchner@gmail.com> - Initial implementation
 */
package org.eclipse.osbp.vaadin.addons.designer.overlay.client;

import org.eclipse.osbp.vaadin.addons.designer.overlay.DesignerOverlayExtension;
import org.eclipse.osbp.vaadin.addons.designer.overlay.client.widgets.OAlignmentChangedEvent;
import org.eclipse.osbp.vaadin.addons.designer.overlay.client.widgets.OAlignmentChangedHandler;
import org.eclipse.osbp.vaadin.addons.designer.overlay.client.widgets.OButtonClickEvent;
import org.eclipse.osbp.vaadin.addons.designer.overlay.client.widgets.OButtonClickHandler;
import org.eclipse.osbp.vaadin.addons.designer.overlay.client.widgets.OOverlayController;

import com.google.gwt.core.shared.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.Event.NativePreviewEvent;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;
import com.vaadin.client.ComponentConnector;
import com.vaadin.client.ServerConnector;
import com.vaadin.client.communication.RpcProxy;
import com.vaadin.client.communication.StateChangeEvent;
import com.vaadin.client.extensions.AbstractExtensionConnector;
import com.vaadin.shared.ui.Connect;

// TODO: Auto-generated Javadoc
/**
 * The Class DesignerExtensionConnector.
 */
@Connect(DesignerOverlayExtension.class)
public class DesignerExtensionConnector extends AbstractExtensionConnector implements OAlignmentChangedHandler,
		OButtonClickHandler, com.google.gwt.user.client.Event.NativePreviewHandler {

	/** The Constant serialVersionUID. */
	private static final long serialVersionUID = -3501965859455838012L;

	/** The rpc. */
	private DesignerExtensionServerRpc rpc = RpcProxy.create(DesignerExtensionServerRpc.class, this);

	/** The hreg. */
	private HandlerRegistration hreg;

	/** The overlay. */
	private ODesignerOverlay overlay;

	private Widget widget;

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * com.vaadin.client.extensions.AbstractExtensionConnector#extend(com.vaadin
	 * .client.ServerConnector)
	 */
	@Override
	protected void extend(ServerConnector target) {
		widget = ((ComponentConnector) target).getWidget();

		overlay = GWT.create(ODesignerOverlay.class);
		overlay.setConnector(DesignerExtensionConnector.this);
		overlay.setOwner(widget);

		OOverlayController.getInstance().register(widget.getElement(), overlay);

		hreg = Event.addNativePreviewHandler(this);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * com.google.gwt.user.client.ui.PopupPanel#onPreviewNativeEvent(com.google.
	 * gwt.user.client.Event.NativePreviewEvent)
	 */
	public void onPreviewNativeEvent(final NativePreviewEvent event) {
		Element target = Element.as(event.getNativeEvent().getEventTarget());
		int type = event.getTypeInt();

		if (type == Event.ONCLICK) {
			if (!event.getNativeEvent().getAltKey()) {
				return;
			}
			if (event.isCanceled()) {
				return;
			}
			if (!isEventOnTarget(target)) {
				return;
			}

			if (!overlay.isShowing()) {
				int top = widget.getAbsoluteTop() + widget.getOffsetHeight();
				int windowHeight = RootPanel.get().getOffsetHeight();
				if (windowHeight - top < 30) {
					// place the popup above
					top = widget.getAbsoluteTop();
				}

				OOverlayController.getInstance().show(overlay, event.getNativeEvent().getClientX(),
						event.getNativeEvent().getClientY());
				event.cancel();
			}
			overlay.setAlignmentInfo(getState().alignment);

		} else if (type == Event.ONKEYUP) {
			if (event.isCanceled()) {
				return;
			}
			if (!isEventOnTarget(target)) {
				return;
			}
			int keyCode = event.getNativeEvent().getKeyCode();
			if (KeyCodes.KEY_UP == keyCode && event.getNativeEvent().getAltKey()) {
				OOverlayController.getInstance().navigateUp();
				event.cancel();
			} else if (KeyCodes.KEY_DOWN == keyCode && event.getNativeEvent().getAltKey()) {
				OOverlayController.getInstance().navigateDown();
				event.cancel();
			} else if (KeyCodes.KEY_ESCAPE == keyCode) {
				OOverlayController.getInstance().close();
				event.cancel();
			}
		}
	}

	/**
	 * Checks if is mouse on target.
	 *
	 * @param target
	 *            the target
	 * @return true, if is mouse on target
	 */
	protected boolean isEventOnTarget(Element target) {
		// is owner the target?
		boolean eventTargetsThis = widget.getElement().isOrHasChild(target);
		return eventTargetsThis;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.vaadin.client.ui.AbstractConnector#getState()
	 */
	@Override
	public DesignerExtensionState getState() {
		return (DesignerExtensionState) super.getState();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * com.vaadin.client.ui.AbstractConnector#onStateChanged(com.vaadin.client.
	 * communication.StateChangeEvent)
	 */
	@Override
	public void onStateChanged(StateChangeEvent stateChangeEvent) {
		super.onStateChanged(stateChangeEvent);

		if (overlay != null) {
			overlay.setAlignmentInfo(getState().alignment);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see com.vaadin.client.ui.AbstractConnector#onUnregister()
	 */
	@Override
	public void onUnregister() {

		OOverlayController.getInstance().unregister(widget.getElement());

		hreg.removeHandler();
		hreg = null;

		if (overlay != null) {
			overlay.destroy();
			overlay = null;
		}

		super.onUnregister();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.osbp.vaadin.addons.designer.overlay.client.widgets.
	 * OAlignmentChangedHandler#onAlignmentChanged(org.eclipse.osbp.vaadin.
	 * addons.designer.overlay.client.widgets.OAlignmentChangedEvent)
	 */
	@Override
	public void onAlignmentChanged(OAlignmentChangedEvent event) {
		getState().alignment = event.getAlignment();
		rpc.alignmentChanged(event.getAlignment());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.osbp.vaadin.addons.designer.overlay.client.widgets.
	 * OButtonClickHandler#clicked(org.eclipse.osbp.vaadin.addons.designer.
	 * overlay.client.widgets.OButtonClickEvent)
	 */
	@Override
	public void clicked(OButtonClickEvent event) {
		if (event.getCustomEventType().equals(OIConstants.EVENT_TYPE__REMOVE_CHILD)) {
			rpc.removeChild();
		} else if (event.getCustomEventType().equals(OIConstants.EVENT_TYPE__ADD_CHILD)) {
			rpc.addChild();
		} else if (event.getCustomEventType().equals(OIConstants.EVENT_TYPE__SWITCH_EDITABLE)) {
			rpc.switchEditable();
		} else if (event.getCustomEventType().equals(OIConstants.EVENT_TYPE__OPEN_PROPERTIES)) {
			rpc.openProperties();
		} else if (event.getCustomEventType().equals(OIConstants.EVENT_TYPE__SWITCH_MARGIN)) {
			rpc.switchMargin();
		} else if (event.getCustomEventType().equals(OIConstants.EVENT_TYPE__SWITCH_SPACING)) {
			rpc.switchSpacing();
		}
	}
}