/*
 * Copyright 2008 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.widgetideas.client.impl;

import com.google.gwt.user.client.*;
import com.google.gwt.user.client.ui.*;
import com.google.gwt.widgetideas.client.*;

/**
 * IE6 implementation of {@link GlassPanelImpl}.
 */
public class GlassPanelImplIE6 extends GlassPanelImpl {
    private int lastDocumentClientWidth = -1;
    private int lastDocumentClientHeight = -1;

    @Override
    public void matchDocumentSize( GlassPanel glassPanel, boolean dueToResize ) {
        int clientWidth = Window.getClientWidth();
        int clientHeight = Window.getClientHeight();

        // Workaround for issue 1934
        // IE fires Window onresize events when the size of the body changes
        if ( !dueToResize || clientWidth != lastDocumentClientWidth || clientHeight != lastDocumentClientHeight ) {
            int offsetWidth = RootPanel.get().getOffsetWidth();
            int offsetHeight = RootPanel.get().getOffsetHeight();

            int scrollWidth = getWindowScrollWidth();
            int scrollHeight = getWindowScrollHeight();

            int width = Math.max( clientWidth, Math.max( offsetWidth, scrollWidth ) );
            int height = Math.max( clientHeight, Math.max( offsetHeight, scrollHeight ) );
            glassPanel.setPixelSize( width, height );

            lastDocumentClientWidth = clientWidth;
            lastDocumentClientHeight = clientHeight;
        }
    }

    @Override
    public final void matchParentSize( final GlassPanel glassPanel, final AbsolutePanel parent ) {
        if ( isCSS1Compat() ) {
            super.matchParentSize( glassPanel, parent );
        } else {
            // less than perfect due to parent borders, but works around other buggy size issues
            glassPanel.setPixelSize( parent.getOffsetWidth(), parent.getOffsetHeight() );
        }
    }
}