ch.unifr.pai.twice.widgets.mptransparentproxy.client.MPProxyBody.java Source code

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Here is the source code for ch.unifr.pai.twice.widgets.mptransparentproxy.client.MPProxyBody.java

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package ch.unifr.pai.twice.widgets.mptransparentproxy.client;

/*
 * Copyright 2013 Oliver Schmid
 * 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.
 */
import ch.unifr.pai.twice.multipointer.provider.client.widgets.MultiFocusTextBox;

import com.google.gwt.dom.client.InputElement;
import com.google.gwt.dom.client.NodeList;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextArea;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.TextBoxBase;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * Multipointer extension of the {@link ProxyBody}
 * 
 * @author Oliver Schmid
 * 
 */
public class MPProxyBody extends ProxyBody {

    private static Map<String, TextBoxBase> focusedElement = new HashMap<String, TextBoxBase>();
    private static Set<String> owningDevices = new HashSet<String>();

    /**
     * Replace all textboxes with multi focus text boxes
     * 
     * @param mainElement
     */
    private void replaceAllTextBoxes(Element mainElement) {
        NodeList<com.google.gwt.dom.client.Element> inputFields = mainElement.getElementsByTagName("input");
        for (int i = 0; i < inputFields.getLength(); i++) {
            final com.google.gwt.dom.client.Element el = inputFields.getItem(i);
            String type = el.getAttribute("type");
            if (type == null || type.isEmpty() || type.equalsIgnoreCase("text")
                    || type.equalsIgnoreCase("search")) {
                MultiFocusTextBox box = new MultiFocusTextBox();
                box.replaceTextInput(InputElement.as(el));
                replacements.add(box);
            }
        }
    }

    @Override
    public void initialize() {
        super.initialize();
        replaceAllTextBoxes(RootPanel.getBodyElement());
    }

    /**
     * Expose the deviceOwnership to JavaScript
     * 
     * @param devices
     */
    private static void setOwningDevices(String devices) {
        owningDevices.clear();
        if (devices != null && !devices.isEmpty()) {
            for (String s : devices.split(",")) {
                owningDevices.add(s);
            }
        }

        // If a device no longer owns the frame, it does not have any focused
        // element anymore.
        if (!owningDevices.isEmpty()) {
            for (String current : focusedElement.keySet()) {
                if (!owningDevices.contains(current)) {
                    focusedElement.remove(current);
                }
            }
        }
    }

    /**
     * @param e
     * @return a textbox or textarea widget if the element is one of those, otherwise null
     */
    private TextBoxBase getTextBoxBase(Element e) {
        if (e.getTagName().equalsIgnoreCase("input") && (e.getAttribute("type") == null
                || e.getAttribute("type").isEmpty() || e.getAttribute("type").equalsIgnoreCase("text")))
            return TextBox.wrap(e);
        else if (e.getTagName().equalsIgnoreCase("textarea"))
            return TextArea.wrap(e);
        return null;
    }

    /**
     * Set up the JS-callable signature as a global JS function.
     * 
     */
    private native void publishInterfaces() /*-{
                                            $wnd.miceSetOwningDevices = @ch.unifr.pai.twice.widgets.mptransparentproxy.client.MPProxyBody::setOwningDevices(Ljava/lang/String;);
                                            $wnd.backInHistory = @com.google.gwt.user.client.History::back();
                                            $wnd.forwardInHistory = @com.google.gwt.user.client.History::forward();
                                            $wnd.reloadFrame = @com.google.gwt.user.client.Window.Location::reload();
                                            }-*/;
}