com.goodow.web.reader.client.ReadFixedHeadPanel.java Source code

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Here is the source code for com.goodow.web.reader.client.ReadFixedHeadPanel.java

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/*
 * Copyright 2012 Goodow.com
 * 
 * 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.goodow.web.reader.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.logical.shared.HasSelectionHandlers;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.resources.client.CssResource;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.Widget;

import com.googlecode.mgwt.dom.client.event.tap.TapEvent;
import com.googlecode.mgwt.dom.client.event.tap.TapHandler;
import com.googlecode.mgwt.ui.client.widget.touch.TouchPanel;

import java.util.LinkedList;

public class ReadFixedHeadPanel extends Composite implements HasSelectionHandlers<Integer> {

    public class FixedButton extends TouchPanel {

        public FixedButton() {
        }

        public void setSelected(final boolean selected) {
            if (selected) {
                addStyleName(fbCss.selected());
            } else {
                removeStyleName(fbCss.selected());
            }
        }

        public void setText(final String text) {
            getElement().setInnerHTML(text);
        }

    }

    interface Binder extends UiBinder<Widget, ReadFixedHeadPanel> {
    }

    interface FixedHeadCss extends CssResource {
        String selected();
    }

    private class InternalTouchHandler implements TapHandler {

        private final FixedButton button;

        public InternalTouchHandler(final FixedButton button) {
            this.button = button;

        }

        @Override
        public void onTap(final TapEvent event) {
            setSelectedButton(getIndexForWidget(button));
        }

    }

    private static Binder binder = GWT.create(Binder.class);

    @UiField
    HTMLPanel root;

    @UiField
    FixedHeadCss fbCss;

    private LinkedList<FixedButton> buttons;
    private LinkedList<HandlerRegistration> handlers = new LinkedList<HandlerRegistration>();

    public ReadFixedHeadPanel() {
        initWidget(binder.createAndBindUi(this));
        buttons = new LinkedList<FixedButton>();
    }

    public FixedButton addButton(final String text) {
        FixedButton fixedButton = new FixedButton();
        fixedButton.setText(text);

        if (buttons.size() == 0) {
            fixedButton.setSelected(true);
        }

        root.add(fixedButton);
        buttons.add(fixedButton);
        handlers.add(fixedButton.addTapHandler(new InternalTouchHandler(fixedButton)));
        return fixedButton;
    }

    @Override
    public HandlerRegistration addSelectionHandler(final SelectionHandler<Integer> handler) {
        return addHandler(handler, SelectionEvent.getType());
    }

    public void setSelectedButton(final int index) {
        setSelectedButton(index, false);
    }

    public void setSelectedButton(final int index, final boolean suppressEvent) {
        if (index < 0) {
            throw new IllegalArgumentException("invalud index");
        }

        if (index >= buttons.size()) {
            throw new IllegalArgumentException("invalud index");
        }
        int count = 0;
        for (FixedButton button : buttons) {
            if (count == index) {
                button.setSelected(true);
            } else {
                button.setSelected(false);
            }
            count++;
        }
        if (!suppressEvent) {
            SelectionEvent.fire(this, Integer.valueOf(index));
        }
    }

    private int getIndexForWidget(final FixedButton w) {
        return buttons.indexOf(w);
    }
}