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

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Here is the source code for burrito.client.crud.widgets.ImagePickerPopup.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 com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.VerticalPanel;
import burrito.client.widgets.blobstore.BlobStoreUploader;

public class ImagePickerPopup extends DialogBox {

    public static interface SaveHandler {
        void saved(String value);
    }

    private List<SaveHandler> saveHandlers = new ArrayList<SaveHandler>();
    private VerticalPanel wrapper = new VerticalPanel();
    private CrudMessages labels = GWT.create(CrudMessages.class);

    /**
     * Creates an {@link ImagePickerPopup} that validates uploaded images
     * against a strictly required width/height. Same as
     * {@link ImagePickerPopup}(width, height, true)
     * 
     * @param width
     * @param height
     */

    public ImagePickerPopup(int width, int height) {
        this(width, height, true);
    }

    /**
     * Creates an {@link ImagePickerPopup} that validates uploaded images
     * against a required width and height. If strict is true then the uploaded
     * image will be validated at exactly that size. If strict is false, then
     * the uploaded image will be validated against a maximum size instead.
     * 
     * @param width
     * @param height
     * @param strict
     *            whether or not the uploaded image size must strictly be width
     *            x height
     */
    public ImagePickerPopup(int width, int height, boolean strict) {
        super(true);
        setText(labels.uploadImage());
        BlobStoreUploader form = new BlobStoreUploader(new AsyncCallback<String>() {

            @Override
            public void onSuccess(String result) {
                saved(result);
            }

            @Override
            public void onFailure(Throwable caught) {
                Window.alert("Failed to store image. Reason: " + caught.getMessage());
                throw new RuntimeException(caught);
            }
        });

        if (strict) {
            wrapper.add(new Label(
                    height == 0 ? labels.requiredImageWidth(width) : labels.requiredImageSize(width, height)));
        } else {
            wrapper.add(new Label(labels.maximumImageSize(width, height)));
        }
        wrapper.add(form);
        setWidget(wrapper);
    }

    public void addSaveHandler(SaveHandler saveHandler) {
        saveHandlers.add(saveHandler);
    }

    private void saved(final String path) {
        for (SaveHandler h : saveHandlers) {
            h.saved(path);
        }
        hide();
    }

}