com.google.livingstories.client.lsp.views.contentitems.DocumentPopupView.java Source code

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Here is the source code for com.google.livingstories.client.lsp.views.contentitems.DocumentPopupView.java

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/**
 * Copyright 2010 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.livingstories.client.lsp.views.contentitems;

import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.Widget;
import com.google.livingstories.client.AssetContentItem;

/**
 * Displays a document in a popup view.
 * 
 * Since documents can be either PDFs displayed in iframes, or direct html/text entered
 * into the content field, this class uses a simple heuristic to determine whether or not
 * to put the content into a scroll panel.
 */
public class DocumentPopupView extends BaseAssetPopupView {
    private static final int CONTENT_LENGTH_THRESHOLD = 250;
    private static final int CONTENT_WIDTH = 500;
    private static final int CONTENT_MARGIN = 100;

    public DocumentPopupView(AssetContentItem contentItem) {
        super(contentItem);
    }

    @Override
    protected Widget getContent(AssetContentItem contentItem) {
        Widget content = super.getContent(contentItem);
        // A rough heuristic: if the content length is less than the threshold,
        // it's probably an iframe with an embedded PDF, which we don't want to
        // scroll.
        // Otherwise, it's probably text content, which we put into a scrollpanel.
        if (contentItem.getContent().length() < CONTENT_LENGTH_THRESHOLD) {
            return content;
        } else {
            int contentHeight = Window.getClientHeight() - 2 * CONTENT_MARGIN;
            ScrollPanel scrollPanel = new ScrollPanel(content);
            scrollPanel.setSize(CONTENT_WIDTH + "px", contentHeight + "px");
            return scrollPanel;
        }
    }
}