bufferings.ktr.wjr.client.ui.widget.WjrAbstractButton.java Source code

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Here is the source code for bufferings.ktr.wjr.client.ui.widget.WjrAbstractButton.java

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/*
 * Copyright 2010 bufferings[at]gmail.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 bufferings.ktr.wjr.client.ui.widget;

import static bufferings.ktr.wjr.client.ui.widget.JQueryUI.*;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.NativeEvent;
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.dom.client.KeyCodes;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.Composite;

/**
 * The button base with JQueryUI theme
 * 
 * @author bufferings[at]gmail.com
 */
public abstract class WjrAbstractButton extends Composite implements HasClickHandlers {

    /**
     * Check if the key code is assigned or not.
     * 
     * @param code
     *          The key code.
     * @return True if the key is assigned, false if not.
     */
    protected static boolean isKeyAssigned(int code) {
        switch (code) {
        case KeyCodes.KEY_ENTER:
            return true;
        default:
            return false;
        }
    }

    /**
     * Whether this button is disabled or not.
     */
    protected boolean disabled = false;

    /**
     * For controling key events.
     */
    protected boolean lastWasKeyDown;

    /**
     * Constructs the WjrAbstractButton.
     */
    public WjrAbstractButton() {
        sinkEvents(Event.ONMOUSEOVER | Event.ONMOUSEOUT | Event.KEYEVENTS);
    }

    /**
     * {@inheritDoc}
     */
    public void onBrowserEvent(Event event) {
        int eventType = DOM.eventGetType(event);

        switch (eventType) {
        case Event.ONMOUSEOVER:
            addStyleName(UI_STATE_HOVER);
            break;
        case Event.ONMOUSEOUT:
            removeStyleName(UI_STATE_HOVER);
            break;
        case Event.ONCLICK:
            if (disabled) {
                return;
            }
        }

        switch (eventType) {
        case Event.ONKEYDOWN:
        case Event.ONKEYPRESS:
        case Event.ONKEYUP:
            if (DOM.eventGetAltKey(event) || DOM.eventGetMetaKey(event)) {
                super.onBrowserEvent(event);
                return;
            }
        }
        switch (eventType) {
        case Event.ONKEYDOWN: {
            keyboardNavigation(event);
            lastWasKeyDown = true;
            break;
        }
        case Event.ONKEYPRESS: {
            if (!lastWasKeyDown) {
                keyboardNavigation(event);
            }
            lastWasKeyDown = false;
            break;
        }
        case Event.ONKEYUP: {
            lastWasKeyDown = false;
            break;
        }
        }

        switch (eventType) {
        case Event.ONKEYDOWN:
        case Event.ONKEYUP: {
            if (isKeyAssigned(DOM.eventGetKeyCode(event))) {
                DOM.eventCancelBubble(event, true);
                DOM.eventPreventDefault(event);
                return;
            }
        }
        }

        super.onBrowserEvent(event);
    }

    /**
     * Sets whether this is disabled or not.
     * 
     * @param disabled
     *          Whether this is disabled or not.
     */
    public void setDisabled(boolean disabled) {
        this.disabled = disabled;
        setStyleName(this.getElement(), UI_STATE_DISABLED, disabled);
    }

    /**
     * Gets whether this is disabled or not.
     * 
     * @return Whether this is disabled or not.
     */
    public boolean isDisabled() {
        return disabled;
    }

    /**
     * {@inheritDoc}
     */
    public HandlerRegistration addClickHandler(ClickHandler handler) {
        return addDomHandler(handler, ClickEvent.getType());
    }

    /**
     * Sets the id of this element.
     * 
     * @param id
     *          id to set
     */
    public void setElemId(String id) {
        getElement().setId(id);
    }

    private void keyboardNavigation(Event event) {
        if (disabled) {
            return;
        }

        int code = DOM.eventGetKeyCode(event);
        switch (code) {
        case KeyCodes.KEY_ENTER: {
            NativeEvent nativeEvent = Document.get().createClickEvent(0, 0, 0, 0, 0, false, false, false, false);
            ClickEvent.fireNativeEvent(nativeEvent, this);
            break;
        }
        }
    }

}