/*******************************************************************************
 * Copyright (c) 2000, 2010 IBM Corporation 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
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.gef.internal.ui.palette.editparts;

import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Image;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.IMemento;

import org.eclipse.draw2d.FocusEvent;
import org.eclipse.draw2d.FocusListener;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.RangeModel;
import org.eclipse.draw2d.geometry.Insets;

import org.eclipse.gef.AccessibleEditPart;
import org.eclipse.gef.ExposeHelper;
import org.eclipse.gef.MouseWheelHelper;
import org.eclipse.gef.editparts.ViewportExposeHelper;
import org.eclipse.gef.editparts.ViewportMouseWheelHelper;
import org.eclipse.gef.internal.InternalImages;
import org.eclipse.gef.internal.ui.palette.PaletteColorUtil;
import org.eclipse.gef.palette.PaletteDrawer;
import org.eclipse.gef.palette.PaletteTemplateEntry;
import org.eclipse.gef.ui.palette.PaletteViewerPreferences;
import org.eclipse.gef.ui.palette.editparts.IPinnableEditPart;
import org.eclipse.gef.ui.palette.editparts.PaletteAnimator;
import org.eclipse.gef.ui.palette.editparts.PaletteEditPart;

/**
 * EditPart for a PaletteDrawer
 * 
 * @author Pratik Shah
 */
public class DrawerEditPart extends PaletteEditPart implements
		IPinnableEditPart {

	private static final String PROPERTY_EXPANSION_STATE = "expansion"; //$NON-NLS-1$
	private static final String PROPERTY_PINNED_STATE = "pinned"; //$NON-NLS-1$

	/**
	 * Constructor
	 * 
	 * @param drawer
	 *            The PaletteDrawer that this EditPart is representing
	 */
	public DrawerEditPart(PaletteDrawer drawer) {
		super(drawer);
	}

	/**
	 * @see org.eclipse.gef.editparts.AbstractGraphicalEditPart#createFigure()
	 */
	public IFigure createFigure() {
		DrawerFigure fig = new DrawerFigure(getViewer().getControl()) {
			IFigure buildTooltip() {
				return createToolTip();
			}
		};
		fig.setExpanded(getDrawer().isInitiallyOpen());
		fig.setPinned(getDrawer().isInitiallyPinned());

		fig.getCollapseToggle().addFocusListener(new FocusListener.Stub() {
			public void focusGained(FocusEvent fe) {
				getViewer().select(DrawerEditPart.this);
			}
		});

		fig.getScrollpane().getContents()
				.addLayoutListener(getPaletteAnimator());

		return fig;
	}

	/**
	 * @see org.eclipse.core.runtime.IAdaptable#getAdapter(Class)
	 */
	public Object getAdapter(Class key) {
		if (key == ExposeHelper.class) {
			ViewportExposeHelper helper = new ViewportExposeHelper(this);
			helper.setMinimumFrameCount(6);
			helper.setMargin(new Insets(PaletteScrollBar.BUTTON_HEIGHT, 0,
					PaletteScrollBar.BUTTON_HEIGHT, 0));
			return helper;
		}
		if (key == MouseWheelHelper.class)
			return new ViewportMouseWheelHelper(this);
		return super.getAdapter(key);
	}

	private PaletteAnimator getPaletteAnimator() {
		return (PaletteAnimator) getViewer().getEditPartRegistry().get(
				PaletteAnimator.class);
	}

	/**
	 * Convenience method that provides access to the PaletteDrawer that is the
	 * model.
	 * 
	 * @return The model PaletteDrawer
	 */
	public PaletteDrawer getDrawer() {
		return (PaletteDrawer) getPaletteEntry();
	}

	/**
	 * Convenience method to get the DrawerFigure for the model drawer.
	 * 
	 * @return The DrawerFigure created in {@link #createFigure()}
	 */
	public DrawerFigure getDrawerFigure() {
		return (DrawerFigure) getFigure();
	}

	/**
	 * @see org.eclipse.gef.GraphicalEditPart#getContentPane()
	 */
	public IFigure getContentPane() {
		return getDrawerFigure().getContentPane();
	}

	public boolean isExpanded() {
		return getDrawerFigure().isExpanded();
	}

	public boolean isPinnedOpen() {
		return getDrawerFigure().isPinnedOpen();
	}

	/**
	 * @see org.eclipse.gef.ui.palette.editparts.PaletteEditPart#nameNeededInToolTip()
	 */
	protected boolean nameNeededInToolTip() {
		return false;
	}

	/**
	 * @return <code>true</code> if the DrawerFigure can be pinned open. This is
	 *         only true when the drawer is expanded and the auto-collapse
	 *         strategy is
	 *         <code>PaletteViewerPreferences.COLLAPSE_AS_NEEDED</code>.
	 */
	public boolean canBePinned() {
		return getDrawerFigure().isPinShowing();
	}

	/**
	 * @see org.eclipse.gef.ui.palette.editparts.PaletteEditPart#createAccessible()
	 */
	protected AccessibleEditPart createAccessible() {
		return new AccessibleGraphicalEditPart() {
			public void getDescription(AccessibleEvent e) {
				e.result = getPaletteEntry().getDescription();
			}

			public void getName(AccessibleEvent e) {
				e.result = getPaletteEntry().getLabel();
			}

			public void getRole(AccessibleControlEvent e) {
				e.detail = ACC.ROLE_TREE;
			}

			public void getState(AccessibleControlEvent e) {
				super.getState(e);
				e.detail |= isExpanded() ? ACC.STATE_EXPANDED
						: ACC.STATE_COLLAPSED;
			}
		};
	}

	/**
	 * @see org.eclipse.gef.editparts.AbstractEditPart#refreshVisuals()
	 */
	protected void refreshVisuals() {
		getDrawerFigure().setToolTip(createToolTip());

		ImageDescriptor img = getDrawer().getSmallIcon();
		if (img == null && getDrawer().showDefaultIcon()) {
			img = InternalImages.DESC_FOLDER_OPEN;
		}
		setImageDescriptor(img);

		getDrawerFigure().setTitle(getPaletteEntry().getLabel());
		getDrawerFigure().setLayoutMode(getLayoutSetting());

		boolean showPin = getPreferenceSource().getAutoCollapseSetting() == PaletteViewerPreferences.COLLAPSE_AS_NEEDED;
		getDrawerFigure().showPin(showPin);

		Color background = getDrawer().getDrawerType().equals(
				PaletteTemplateEntry.PALETTE_TYPE_TEMPLATE) ? PaletteColorUtil.WIDGET_LIST_BACKGROUND
				: null;
		getDrawerFigure().getScrollpane().setBackgroundColor(background);
	}

	/**
	 * @see org.eclipse.gef.editparts.AbstractEditPart#register()
	 */
	protected void register() {
		super.register();
		getPaletteAnimator().addDrawer(this);
		getFigure().addLayoutListener(getPaletteAnimator());
	}

	/**
	 * @see org.eclipse.gef.ui.palette.editparts.PaletteEditPart#restoreState(org.eclipse.ui.IMemento)
	 */
	public void restoreState(IMemento memento) {
		setExpanded(new Boolean(memento.getString(PROPERTY_EXPANSION_STATE))
				.booleanValue());
		setPinnedOpen(new Boolean(memento.getString(PROPERTY_PINNED_STATE))
				.booleanValue());
		RangeModel rModel = getDrawerFigure().getScrollpane().getViewport()
				.getVerticalRangeModel();
		rModel.setMinimum(memento.getInteger(RangeModel.PROPERTY_MINIMUM)
				.intValue());
		rModel.setMaximum(memento.getInteger(RangeModel.PROPERTY_MAXIMUM)
				.intValue());
		rModel.setExtent(memento.getInteger(RangeModel.PROPERTY_EXTENT)
				.intValue());
		rModel.setValue(memento.getInteger(RangeModel.PROPERTY_VALUE)
				.intValue());
		super.restoreState(memento);
	}

	/**
	 * @see org.eclipse.gef.ui.palette.editparts.PaletteEditPart#saveState(org.eclipse.ui.IMemento)
	 */
	public void saveState(IMemento memento) {
		memento.putString(PROPERTY_EXPANSION_STATE,
				new Boolean(isExpanded()).toString());
		memento.putString(PROPERTY_PINNED_STATE,
				new Boolean(isPinnedOpen()).toString());
		RangeModel rModel = getDrawerFigure().getScrollpane().getViewport()
				.getVerticalRangeModel();
		memento.putInteger(RangeModel.PROPERTY_MINIMUM, rModel.getMinimum());
		memento.putInteger(RangeModel.PROPERTY_MAXIMUM, rModel.getMaximum());
		memento.putInteger(RangeModel.PROPERTY_EXTENT, rModel.getExtent());
		memento.putInteger(RangeModel.PROPERTY_VALUE, rModel.getValue());
		super.saveState(memento);
	}

	/**
	 * Sets the expansion state of the DrawerFigure
	 * 
	 * @param expanded
	 *            <code>true</code> if the drawer is expanded; false otherwise.
	 */
	public void setExpanded(boolean expanded) {
		getDrawerFigure().setExpanded(expanded);
	}

	/**
	 * @see org.eclipse.gef.ui.palette.editparts.PaletteEditPart#setImageInFigure(Image)
	 */
	protected void setImageInFigure(Image image) {
		getDrawerFigure().setTitleIcon(image);
	}

	public void setPinnedOpen(boolean pinned) {
		getDrawerFigure().setPinned(pinned);
	}

	/**
	 * @see org.eclipse.gef.EditPart#setSelected(int)
	 */
	public void setSelected(int value) {
		super.setSelected(value);
		getDrawerFigure().getCollapseToggle().requestFocus();
	}

	/**
	 * @see org.eclipse.gef.editparts.AbstractEditPart#unregister()
	 */
	protected void unregister() {
		getPaletteAnimator().removeDrawer(this);
		super.unregister();
	}

}