burrito.client.crud.widgets.ImagePicker.java Source code

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Here is the source code for burrito.client.crud.widgets.ImagePicker.java

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/**
 * Copyright 2011 Henric Persson (henric.persson@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 burrito.client.crud.widgets;

import java.util.ArrayList;
import java.util.List;

import burrito.client.crud.labels.CrudMessages;
import burrito.client.widgets.validation.HasValidators;
import burrito.client.widgets.validation.InputFieldValidator;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.HasChangeHandlers;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.VerticalPanel;

public class ImagePicker extends Composite implements HasChangeHandlers, HasValidators {

    private CrudMessages labels = GWT.create(CrudMessages.class);
    private VerticalPanel wrapper = new VerticalPanel();
    private Image previewThumbnail = new Image();
    private Anchor chooseImage = new Anchor(labels.uploadImage());
    private Anchor removeImage = new Anchor(labels.removeImage());
    private ImagePickerPopup popup;
    private String currentImage;
    private List<ChangeHandler> handlers = new ArrayList<ChangeHandler>();
    private Label validationError = new Label();
    private boolean required;

    public ImagePicker(boolean required, String value, int width, int height) {
        setValue(value);
        this.required = required;
        validationError.addStyleName("validationError");
        validationError.setVisible(false);
        popup = new ImagePickerPopup(width, height);
        previewThumbnail.setSize("120px", "67px");
        previewThumbnail.addStyleName("k5-ImagePicker-thumb");
        previewThumbnail.addClickHandler(new ClickHandler() {

            public void onClick(ClickEvent event) {
                if (currentImage != null) {
                    Window.open(currentImage, "_blank", null);
                }
            }
        });
        popup.addSaveHandler(new ImagePickerPopup.SaveHandler() {

            public void saved(String value) {
                setValue("/images/view/" + value);
            }
        });
        chooseImage.addClickHandler(new ClickHandler() {

            public void onClick(ClickEvent event) {
                popup.center();
                popup.show();
            }
        });
        chooseImage.addStyleName("k5-ImagePicker-choose");

        removeImage.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                setValue(null);
            }
        });

        Label label = new Label(
                height == 0 ? labels.requiredImageWidth(width) : labels.requiredImageSize(width, height));
        label.addStyleName("k5-ImagePicker-description");
        wrapper.add(label);
        wrapper.add(validationError);
        wrapper.add(previewThumbnail);
        wrapper.add(chooseImage);
        wrapper.add(removeImage);
        initWidget(wrapper);
        addStyleName("k5-ImagePicker");
    }

    public String getValue() {
        return currentImage;
    }

    public void setValue(String value) {
        currentImage = value;
        if (value == null) {
            previewThumbnail.setVisible(false);
        } else {
            previewThumbnail.setUrl(value.replace("/images/view/", "/images/view/thumb_"));
            previewThumbnail.setVisible(true);
        }
        fireChange();
    }

    private void fireChange() {
        for (ChangeHandler handler : handlers) {
            handler.onChange(null);
        }
    }

    public HandlerRegistration addChangeHandler(ChangeHandler handler) {
        handlers.add(handler);
        return null;
    }

    public void addInputFieldValidator(InputFieldValidator validator) {
        throw new UnsupportedOperationException();
    }

    public void setValidationError(String errorText) {
        validationError.setVisible(false);
        if (errorText != null) {
            validationError.setText(errorText);
            validationError.setVisible(true);
        }
    }

    public boolean validate() {
        setValidationError(null);
        if (getValue() == null && required) {
            setValidationError(labels.mustAddImage());
            return false;
        }
        return true;
    }

    @Override
    public void highlight() {

    }

}