com.google.gerrit.client.ui.RemoteSuggestBox.java Source code

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Here is the source code for com.google.gerrit.client.ui.RemoteSuggestBox.java

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// Copyright (C) 2014 The Android Open Source Project
//
// 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.google.gerrit.client.ui;

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.event.dom.client.KeyDownEvent;
import com.google.gwt.event.dom.client.KeyDownHandler;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.event.logical.shared.HasCloseHandlers;
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.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Focusable;
import com.google.gwt.user.client.ui.HasText;
import com.google.gwt.user.client.ui.SuggestBox;
import com.google.gwt.user.client.ui.SuggestBox.DefaultSuggestionDisplay;
import com.google.gwt.user.client.ui.SuggestOracle;
import com.google.gwt.user.client.ui.SuggestOracle.Suggestion;
import com.google.gwt.user.client.ui.TextBoxBase;

public class RemoteSuggestBox extends Composite
        implements Focusable, HasText, HasSelectionHandlers<String>, HasCloseHandlers<RemoteSuggestBox> {
    private final RemoteSuggestOracle remoteSuggestOracle;
    private final DefaultSuggestionDisplay display;
    private final HintTextBox textBox;
    private final SuggestBox suggestBox;
    private boolean submitOnSelection;

    public RemoteSuggestBox(SuggestOracle oracle) {
        remoteSuggestOracle = new RemoteSuggestOracle(oracle);
        remoteSuggestOracle.setServeSuggestions(true);
        display = new DefaultSuggestionDisplay();

        textBox = new HintTextBox();
        textBox.addKeyDownHandler(new KeyDownHandler() {
            @Override
            public void onKeyDown(KeyDownEvent e) {
                submitOnSelection = false;
                if (e.getNativeKeyCode() == KeyCodes.KEY_ESCAPE) {
                    CloseEvent.fire(RemoteSuggestBox.this, RemoteSuggestBox.this);
                } else if (e.getNativeKeyCode() == KeyCodes.KEY_ENTER) {
                    if (display.isSuggestionListShowing()) {
                        if (textBox.getValue().equals(remoteSuggestOracle.getLast())) {
                            submitOnSelection = true;
                        } else {
                            display.hideSuggestions();
                        }
                    } else {
                        SelectionEvent.fire(RemoteSuggestBox.this, getText());
                    }
                }
            }
        });

        suggestBox = new SuggestBox(remoteSuggestOracle, textBox, display);
        suggestBox.addSelectionHandler(new SelectionHandler<Suggestion>() {
            @Override
            public void onSelection(SelectionEvent<Suggestion> event) {
                if (submitOnSelection) {
                    SelectionEvent.fire(RemoteSuggestBox.this, getText());
                }
                remoteSuggestOracle.cancelOutstandingRequest();
                display.hideSuggestions();
            }
        });
        initWidget(suggestBox);
    }

    public void setHintText(String hint) {
        textBox.setHintText(hint);
    }

    public void setVisibleLength(int len) {
        textBox.setVisibleLength(len);
    }

    public void setEnabled(boolean enabled) {
        suggestBox.setEnabled(enabled);
    }

    public TextBoxBase getTextBox() {
        return textBox;
    }

    @Override
    public String getText() {
        return suggestBox.getText();
    }

    @Override
    public void setText(String value) {
        suggestBox.setText(value);
    }

    @Override
    public void setFocus(boolean focus) {
        suggestBox.setFocus(focus);
    }

    @Override
    public int getTabIndex() {
        return suggestBox.getTabIndex();
    }

    @Override
    public void setAccessKey(char key) {
        suggestBox.setAccessKey(key);
    }

    @Override
    public void setTabIndex(int index) {
        suggestBox.setTabIndex(index);
    }

    @Override
    public HandlerRegistration addSelectionHandler(SelectionHandler<String> h) {
        return addHandler(h, SelectionEvent.getType());
    }

    @Override
    public HandlerRegistration addCloseHandler(CloseHandler<RemoteSuggestBox> h) {
        return addHandler(h, CloseEvent.getType());
    }

    public void selectAll() {
        suggestBox.getValueBox().selectAll();
    }

    public void enableDefaultSuggestions() {
        textBox.addFocusHandler(new FocusHandler() {
            @Override
            public void onFocus(FocusEvent focusEvent) {
                if (textBox.getText().equals("")) {
                    suggestBox.showSuggestionList();
                }
            }
        });
    }

    public void setServeSuggestionsOnOracle(boolean serveSuggestions) {
        remoteSuggestOracle.setServeSuggestions(serveSuggestions);
    }
}