n3phele.client.widgets.StyledButtonCell.java Source code

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Here is the source code for n3phele.client.widgets.StyledButtonCell.java

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/**
 * @author Nigel Cook
 *
 * (C) Copyright 2010-2012. Nigel Cook. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Licensed under the terms described in LICENSE file that accompanied this code, (the "License"); you may not use this file
 * except in compliance with the License. 
 * 
 *  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 n3phele.client.widgets;

import com.google.gwt.cell.client.ActionCell;
import com.google.gwt.cell.client.ValueUpdater;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import com.google.gwt.user.client.ui.UIObject;

public class StyledButtonCell<C> extends ActionCell<C> {
    private String style;
    final private String tip;
    private String text = null;
    private Element eventTarget = null;
    private Context context;
    private Element parent;
    private C value;

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.google.gwt.cell.client.ActionCell#onBrowserEvent(com.google.gwt.cell
     * .client.Cell.Context, com.google.gwt.dom.client.Element,
     * java.lang.Object, com.google.gwt.dom.client.NativeEvent,
     * com.google.gwt.cell.client.ValueUpdater)
     */
    @Override
    public void onBrowserEvent(Context context, Element parent, C value, NativeEvent event,
            ValueUpdater<C> valueUpdater) {
        Element target = event.getEventTarget().cast();
        Element me = parent.getFirstChildElement();
        if (!me.isOrHasChild(target)) {
            return;
        }
        this.eventTarget = target;
        this.context = context;
        this.parent = parent;
        this.value = value;
        super.onBrowserEvent(context, parent, value, event, valueUpdater);
    }

    private static class UIObjectWrapper extends UIObject {
        public UIObjectWrapper(Element element) {
            setElement(element);
        }
    }

    public UIObject getEventTarget() {
        return new UIObjectWrapper(this.eventTarget);
    }

    public StyledButtonCell(com.google.gwt.cell.client.ActionCell.Delegate<C> delegate, String style, String tip) {
        super("", delegate);
        this.style = style;
        this.tip = tip;
    }

    public StyledButtonCell(StyledButtonDelegate<C> delegate, String style, String tip) {
        super("", delegate);
        this.style = style;
        this.tip = tip;
        delegate.setCell(this);
    }

    @Override
    public void render(Context context, C value, SafeHtmlBuilder sb) {
        if (value != null) {
            sb.appendHtmlConstant("<button type=\"button\" class=\"" + this.style + "\""
                    + (tip != null ? "title=\"" + this.tip + "\" " : "") + " tabindex=\"-1\">"
                    + (this.text == null ? "" : this.text) + "</button>");
        } else {
            //sb.appendHtmlConstant("<span></span>");
            sb.appendHtmlConstant("<button type=\"button\" class=\"" + this.style
                    + "\" style=\"visibility: hidden;\" tabindex=\"-1\">" + (this.text == null ? "" : this.text)
                    + "</button>");

        }
    }

    public void setText(String text) {
        this.text = SafeHtmlUtils.htmlEscape(text);
    }

    public static abstract class StyledButtonDelegate<C>
            implements com.google.gwt.cell.client.ActionCell.Delegate<C> {
        private StyledButtonCell<C> cell;

        public void setCell(StyledButtonCell<C> cell) {
            this.cell = cell;
        }

        public StyledButtonCell<C> getCell() {
            return this.cell;
        }
    }

    /**
     * @param style the new cell style
     */
    public void setStyle(String style) {
        this.style = style;
    }

    /**
     * 
     */
    public void redraw() {
        this.setValue(this.context, this.parent, this.value);

    }
}