org.pentaho.ui.xul.gwt.util.FrameCover.java Source code

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Here is the source code for org.pentaho.ui.xul.gwt.util.FrameCover.java

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/*!
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
 */

package org.pentaho.ui.xul.gwt.util;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NodeList;
import com.google.gwt.dom.client.Style;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.FocusPanel;
import com.google.gwt.user.client.ui.RootPanel;
import org.pentaho.gwt.widgets.client.dialogs.GlassPane;

import java.util.HashSet;
import java.util.Set;

/**
 * User: RFellows Date: 7/31/13
 */
public class FrameCover {

    private Set<ClickHandler> clickHandlers = new HashSet<ClickHandler>();

    private static FocusPanel frameLid;

    public FrameCover() {
        Window.addResizeHandler(new ResizeHandler() {
            @Override
            public void onResize(ResizeEvent event) {
                setFrameSize();
            }
        });
    }

    public void addClickHandler(ClickHandler handler) {
        clickHandlers.add(handler);
    }

    public void cover() {
        if (frameLid == null) {
            frameLid = new FocusPanel() {
                public void onBrowserEvent(Event event) {
                    int type = event.getTypeInt();
                    switch (type) {
                    case Event.ONKEYDOWN: {
                        if ((char) event.getKeyCode() == KeyCodes.KEY_ESCAPE) {
                            event.stopPropagation();
                            fireHandlers();
                        }
                        return;
                    }
                    }
                    super.onBrowserEvent(event);
                };
            };
            frameLid.addClickHandler(new ClickHandler() {
                public void onClick(ClickEvent event) {
                    fireHandlers();
                    frameLid.setVisible(false);
                    frameLid.getElement().getStyle().setDisplay(Style.Display.NONE);
                }
            });

            RootPanel.get().add(frameLid, 0, 0);
            frameLid.setVisible(true);
            setFrameSize();
        }
        frameLid.getElement().getStyle().setDisplay(Style.Display.BLOCK);
        GlassPane.getInstance().show();
    }

    public void remove() {
        frameLid.getElement().getStyle().setDisplay(Style.Display.NONE);
        GlassPane.getInstance().hide();
    }

    private void fireHandlers() {
        for (ClickHandler handler : clickHandlers) {
            handler.onClick(null);
        }
    }

    private void setFrameSize() {
        if (frameLid == null) {
            return;
        }
        // get all iFrames on the document
        NodeList<Element> iframes = Document.get().getElementsByTagName("iframe");

        int top = Integer.MAX_VALUE;
        int left = Integer.MAX_VALUE;
        int width = 0;
        int height = 0;

        // determine the MAX bounds they encompass
        for (int i = 0; i < iframes.getLength(); i++) {
            Element iframe = iframes.getItem(i);
            if (iframe.getOffsetWidth() > 0 && iframe.getOffsetHeight() > 0) {
                top = Math.min(top, iframe.getAbsoluteTop());
                left = Math.min(left, iframe.getAbsoluteLeft());
                width = Math.max(width, iframe.getAbsoluteRight());
                height = Math.max(height, iframe.getAbsoluteBottom());
            }
        }

        // set the size/position of the frame cover to that max
        frameLid.getElement().getStyle().setLeft(left, Style.Unit.PX);
        frameLid.getElement().getStyle().setTop(top, Style.Unit.PX);
        frameLid.getElement().getStyle().setWidth(width, Style.Unit.PX);
        frameLid.getElement().getStyle().setHeight(height, Style.Unit.PX);

    }

}