ch.unifr.pai.twice.widgets.client.MyNewTextBox.java Source code

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

Source

package ch.unifr.pai.twice.widgets.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.comm.serverPush.client.ServerPushEventBus;
import ch.unifr.pai.twice.widgets.client.events.UndoableRemoteKeyPressEvent;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Style.BorderStyle;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.dom.client.Style.Visibility;
import com.google.gwt.event.dom.client.BlurEvent;
import com.google.gwt.event.dom.client.BlurHandler;
import com.google.gwt.event.dom.client.FocusEvent;
import com.google.gwt.event.dom.client.FocusHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.Event.NativePreviewEvent;
import com.google.gwt.user.client.Event.NativePreviewHandler;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.AbsolutePanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TextBox;
import com.google.web.bindery.event.shared.HandlerRegistration;

public class MyNewTextBox extends AbsolutePanel {

    private NativePreviewHandler previewHandler = new Event.NativePreviewHandler() {

        @Override
        public void onPreviewNativeEvent(NativePreviewEvent event) {
            UndoableRemoteKeyPressEvent e;
            if (Event.ONKEYUP == event.getTypeInt()) {
                switch (event.getNativeEvent().getKeyCode()) {
                case KeyCodes.KEY_BACKSPACE:
                case KeyCodes.KEY_DELETE:
                    e = GWT.create(UndoableRemoteKeyPressEvent.class);
                    e.setKeyCode(event.getNativeEvent().getKeyCode());
                    eventBus.fireEventFromSource(e, source);
                    break;
                case KeyCodes.KEY_LEFT:
                    e = GWT.create(UndoableRemoteKeyPressEvent.class);
                    e.setCursorPos(-1);
                    eventBus.fireEventFromSource(e, source);
                    break;
                case KeyCodes.KEY_RIGHT:
                    e = GWT.create(UndoableRemoteKeyPressEvent.class);
                    e.setCursorPos(1);
                    eventBus.fireEventFromSource(e, source);
                    break;
                }
                event.cancel();
            } else if (Event.ONKEYPRESS == event.getTypeInt()) {
                switch (event.getNativeEvent().getKeyCode()) {
                case KeyCodes.KEY_BACKSPACE:
                case KeyCodes.KEY_LEFT:
                case KeyCodes.KEY_RIGHT:
                case KeyCodes.KEY_DELETE:
                    break;
                default:
                    e = GWT.create(UndoableRemoteKeyPressEvent.class);
                    e.setText(String.valueOf((char) event.getNativeEvent().getCharCode()));
                    eventBus.fireEventFromSource(e, source);
                }
                event.cancel();
            }
        }
    };

    private HandlerRegistration previewRegistration;
    private RemoteTextInputInterpreter interpreter;
    private ServerPushEventBus eventBus;
    private String source;
    private TextBox t = new TextBox();
    private Label measurement = new Label();
    private Label l2 = new Label();
    private HTML cursor = new HTML();
    private Timer cursorBlink;

    public MyNewTextBox(ServerPushEventBus eventBus, String source) {
        this.eventBus = eventBus;
        this.source = source;
        l2.getElement().getStyle().setBorderStyle(BorderStyle.SOLID);
        l2.getElement().getStyle().setBorderWidth(1, Unit.PX);
        l2.getElement().getStyle().setWidth(100, Unit.PCT);
        measurement.getElement().getStyle().setVisibility(Visibility.HIDDEN);
        cursor.setHeight("15px");
        cursor.getElement().getStyle().setBackgroundColor("black");
        //      cursor.getElement().getStyle().setBorderStyle(BorderStyle.SOLID);
        cursor.setWidth("1px");
        cursorBlink = new Timer() {

            @Override
            public void run() {
                if (cursor.getElement().getStyle().getVisibility().equals(Visibility.VISIBLE.getCssName())) {
                    cursor.getElement().getStyle().setVisibility(Visibility.HIDDEN);
                } else {
                    cursor.getElement().getStyle().setVisibility(Visibility.VISIBLE);
                }
            }
        };
        cursor.getElement().getStyle().setVisibility(Visibility.HIDDEN);
        this.setWidth("100px");
        this.setHeight("120px");
        this.add(measurement, 0, 0);
        this.add(cursor, 0, 0);
        this.add(l2, 0, 0);
        this.add(t, 0, 0);
        this.interpreter = new RemoteTextInputInterpreter(new Command() {

            @Override
            public void execute() {
                measurement.setText(interpreter.getValue().substring(0, interpreter.getThisCursorPos()));
                t.setText(interpreter.getValue());
                l2.setText(interpreter.getValue());
                MyNewTextBox.this.setWidgetPosition(cursor, measurement.getOffsetWidth(),
                        measurement.getOffsetHeight() - 15);

            }
        }, eventBus, source);
        t.addFocusHandler(new FocusHandler() {

            @Override
            public void onFocus(FocusEvent event) {
                previewRegistration = Event.addNativePreviewHandler(previewHandler);
                t.getElement().getStyle().setVisibility(Visibility.HIDDEN);
                cursorBlink.scheduleRepeating(600);
            }
        });
        t.addBlurHandler(new BlurHandler() {

            @Override
            public void onBlur(BlurEvent event) {
                if (previewRegistration != null) {
                    previewRegistration.removeHandler();
                    previewRegistration = null;
                }
                t.getElement().getStyle().setVisibility(Visibility.VISIBLE);
                cursor.getElement().getStyle().setVisibility(Visibility.HIDDEN);
                cursorBlink.cancel();
            }
        });

    }

}