next.i.view.XBarItem.java Source code

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Here is the source code for next.i.view.XBarItem.java

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/*
 * Copyright 2011 Vancouver Ywebb Consulting Ltd
 * 
 * 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 next.i.view;

import next.i.XStyle;
import next.i.mobile.DragController;
import next.i.mobile.DragEvent;
import next.i.mobile.DragEventsHandler;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.HasClickHandlers;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter;
import com.google.gwt.user.client.ui.HasVerticalAlignment;

/**
 * This class encapsulates information about a navigation item on the
 * NavigationBar object's stack, including what is displayed on the navigation
 * bar when the item is at the top of the stack and how it is represented when
 * it is the back item. To be represented on the navigation bar, a navigation
 * item must have a title.
 * 
 * <p>
 * It also represents an item in a Toolbar or NavigationItem. Each bar item
 * behaves similarly to a button, and has a title, image, action, and target.
 * The BarItem class provides methods you can use to specify bar button items
 * with system-provided images, such as the plus image.
 * </p>
 * 
 * <p>
 * <img class='ai' src='../../../resources/XBarItem.png' />
 * </p>
 */
public class XBarItem extends Composite implements HasClickHandlers, DragEventsHandler {

    private FlexTable _item;
    private boolean _hasClickHandler = false;
    private boolean enabled = true;

    // private boolean isBackButton;

    public static enum Type {
        BUTTON, BACK_BUTTON, TOGGLE_BUTTON, LABEL
    }

    XBarItem(Type type) {
        BarItem_(type);
    }

    public XBarItem(Type type, String title) {
        this(type);
        setTitle(title);
    }

    @Override
    public HandlerRegistration addClickHandler(ClickHandler handler) {
        _hasClickHandler = true;
        return addHandler(handler, ClickEvent.getType());
    }

    @Override
    public void onLoad() {
        super.onLoad();
        DragController.get().addDragEventsHandler(this);
    }

    @Override
    public void onUnload() {
        DragController.get().removeDragEventsHandler(this);
    }

    void setSelected(boolean isActive) {
        setSelected_(isActive);
    }

    public boolean isEnabled() {
        return enabled;
    }

    public void setEnabled(boolean enabled) {
        if (enabled) {
            XBarItem.this.removeStyleName(XStyle.disabled.name());
        } else {
            XBarItem.this.addStyleName(XStyle.disabled.name());
        }
    }

    boolean hasClickHandler() {
        return _hasClickHandler;
    }

    public void setTitle(String title) {
        _item.setText(0, 0, title);
    }

    public void setHighlighted(boolean isHightLighted) {
        addStyleName(XStyle.highlighted.name());
    }

    public void onDragEnd(DragEvent e) {
        setSelected_(false);
    }

    public void onDragMove(DragEvent e) {
        setSelected_(true);
    }

    public void onDragStart(DragEvent e) {
        setSelected_(true);
    }

    /**
     * private
     */

    private void setSelected_(boolean isActive) {
        if (isActive) {
            XBarItem.this.addStyleName(XStyle.selected.name());
        } else {
            XBarItem.this.removeStyleName(XStyle.selected.name());
        }
    }

    private void BarItem_(Type type) {
        _item = new FlexTable();
        _item.setCellPadding(0);
        _item.setCellSpacing(0);
        initWidget(_item);
        sinkEvents(Event.ONCLICK | Event.ONTOUCHCANCEL | Event.ONTOUCHEND | Event.ONTOUCHMOVE | Event.ONTOUCHSTART);

        setStyleName(XStyle.navBarItem.name());

        _item.setHTML(0, 0, "&nbsp;");
        if (type != Type.LABEL) {
            _item.setHTML(0, 1, "<div>&nbsp;</div>");
        }

        FlexCellFormatter cf = _item.getFlexCellFormatter();
        cf.setStyleName(0, 0, "body");
        if (type != Type.LABEL) {
            cf.setStyleName(0, 1, "right");
        }

        cf.setVerticalAlignment(0, 0, HasVerticalAlignment.ALIGN_MIDDLE);

        if (type == Type.BACK_BUTTON) {
            addStyleName(XStyle.navBarItemBack.name());
        }
    }

    @Override
    public void onDragMoveHorizontal(DragEvent e) {
        // Not implemented
    }

    @Override
    public void onDragMoveVertical(DragEvent e) {
        // Not implemented
    }

}