ColumnLayout.java example

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cdt-master
/*******************************************************************************
 * Copyright (c) 2011, 2012 Mentor Graphics 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:
 *     Vladimir Prus (Mentor Graphics) - initial API and implementation
 *******************************************************************************/

package org.eclipse.cdt.dsf.gdb.internal.ui.osview;

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

import org.eclipse.cdt.dsf.gdb.internal.ui.GdbUIPlugin;
import org.eclipse.jface.dialogs.IDialogSettings;

/* Hold information about which columns in a table are visible, and what
 * width they have. Stores that information inside preferences store.
 */
class ColumnLayout
{
	private String fResourceClass;
	private Map<String, Boolean> fVisible = new HashMap<String, Boolean>();
	private Map<String, Integer> fWidth = new HashMap<String, Integer>();
	private Integer fSortColumn = null;
	private Integer fSortDirection = null;

	private static IDialogSettings settings;
	private static IDialogSettings getDialogSettings()
	{
		if (settings != null)
			return settings;

		IDialogSettings topSettings = GdbUIPlugin.getDefault().getDialogSettings();
		settings = topSettings.getSection(ResourceClassContributionItem.class.getName());
		if (settings == null) {
			settings = topSettings.addNewSection(ResourceClassContributionItem.class.getName());
		}
		return settings;
	}

	private static void setDefaultSetting(String key, boolean value)
	{
		IDialogSettings s = getDialogSettings();
		if (s.get(key) == null)
			s.put(key, value);
	}

	private static void setDefaultSetting(String key, int value)
	{
		IDialogSettings s = getDialogSettings();
		if (s.get(key) == null)
			s.put(key, value);
	}

	public ColumnLayout(String resourceClass)
	{
		fResourceClass = resourceClass;
	}

	public boolean getVisible(String column)
	{
		if (fVisible.containsKey(column))
			return fVisible.get(column);
		else
		{
			setDefaultSetting(columnKey(column, "v"), true); //$NON-NLS-1$
			boolean b = getDialogSettings().getBoolean(columnKey(column, "v")); //$NON-NLS-1$
			fVisible.put(column, b);
			return b;
		}
	}

	public void setVisible(String column, boolean visible)
	{
		fVisible.put(column, visible);
		getDialogSettings().put(columnKey(column, "v"), visible); //$NON-NLS-1$
	}

	public int getWidth(String column)
	{
		if (fWidth.containsKey(column))
			return fWidth.get(column);
		else
		{
			setDefaultSetting(columnKey(column, "w"), -1); //$NON-NLS-1$
			int w = getDialogSettings().getInt(columnKey(column, "w")); //$NON-NLS-1$
			fWidth.put(column, w);
			return w;
		}
	}

	public void setWidth(String column, int width)
	{
		fWidth.put(column, width);
		getDialogSettings().put(columnKey(column, "w"), width); //$NON-NLS-1$
	}

	public int getSortColumn()
	{
		if (fSortColumn == null)
		{
			setDefaultSetting(globalKey("sortColumn"), 0); //$NON-NLS-1$
			fSortColumn = getDialogSettings().getInt(globalKey("sortColumn"));	//$NON-NLS-1$
		}
		return fSortColumn;
	}

	public void setSortColumn(int column)
	{
		fSortColumn = column;
		getDialogSettings().put(globalKey("sortColumn"), fSortColumn); //$NON-NLS-1$
	}

	public int getSortDirection()
	{
		if (fSortDirection == null)
		{
			setDefaultSetting(globalKey("sortDirection"), 1); //$NON-NLS-1$
			fSortDirection = getDialogSettings().getInt(globalKey("sortDirection")); //$NON-NLS-1$
		}
		return fSortDirection;
	}

	public void setSortDirection(int direction)
	{
		fSortDirection = direction;
		getDialogSettings().put(globalKey("sortDirection"), fSortDirection); //$NON-NLS-1$
	}

	private String columnKey(String column, String what)
	{
		return "columnLayout." + fResourceClass + "." + column + "." + what; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	}

	private String globalKey(String what)
	{
		return "columnLayout." + fResourceClass + "." + what; //$NON-NLS-1$ //$NON-NLS-2$
	}
}