za.co.brewtour.client.application.imageupload.ImageUploadView.java Source code

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Here is the source code for za.co.brewtour.client.application.imageupload.ImageUploadView.java

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/**
 * Copyright 2011 ArcBees Inc.
 *
 * 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 za.co.brewtour.client.application.imageupload;

import com.github.gwtbootstrap.client.ui.Button;
import com.github.gwtbootstrap.client.ui.FileUpload;
import com.github.gwtbootstrap.client.ui.Form;
import com.github.gwtbootstrap.client.ui.Form.SubmitCompleteEvent;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Hidden;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Widget;
import com.google.inject.Inject;
import com.gwtplatform.dispatch.shared.DispatchAsync;
import com.gwtplatform.mvp.client.ViewWithUiHandlers;

public class ImageUploadView extends ViewWithUiHandlers<ImageUploadUiHandlers>
        implements ImageUploadPresenter.MyView {

    public interface Binder extends UiBinder<Widget, ImageUploadView> {
    }

    int imageSize = 0;

    @UiField
    Hidden filenameField;

    @UiField
    Button uploadButton;

    @UiField
    Form uploadForm;

    @UiField
    FileUpload uploadFile;

    @UiField
    HTML serverResponse;

    @UiField
    Image imageField;

    @Inject
    public ImageUploadView(final Binder binder) {
        initWidget(binder.createAndBindUi(this));

        // Disable the button until we get the URL to POST to
        setUploadButton("Loading...", false);
        uploadForm.setEncoding(FormPanel.ENCODING_MULTIPART);
        uploadForm.setMethod(FormPanel.METHOD_POST);
        uploadFile.setName("image");
    }

    @UiHandler("uploadForm")
    void onSubmit(SubmitCompleteEvent e) {
        if (getUiHandlers() != null)
            getUiHandlers().onSubmitCompeteResult(e);
    }

    @Override
    public void setServerResponse(String serverResponse) {
        this.serverResponse.setHTML(serverResponse);
    }

    @Override
    public void setUploadUrl(String url) {
        uploadForm.setAction(url);
        setUploadButton("Upload", true);
    }

    @UiHandler("uploadButton")
    void onSubmit(ClickEvent e) {
        checkSetFilename();
        submitForm();
        setUploadButton("Uploading...", false);
    }

    @Override
    public void setUploadButton(String text, boolean enabled) {
        uploadButton.setText(text);
        uploadButton.setEnabled(enabled);
    }

    @UiHandler("uploadFile")
    void onUpoadFileChange(ChangeEvent event) {
        checkSetFilename();
    }

    public void checkSetFilename() {
        if (filenameField.getValue().isEmpty()) {
            filenameField.setValue(basename(uploadFile.getFilename()));
        }
    }

    @Override
    public void submitForm() {
        checkSetFilename();
        uploadForm.submit();
    }

    /**
     * Gets the image URL for this widget. If a new image has been uploaded this
     * URL will be genereated.
     * 
     * @return the imageUrl
     */
    public String getImageUrl() {
        return imageField.getUrl();
    }

    /**
     * Sets the image URL for this widget
     * 
     * @param imageUrl
     *            the imageUrl to set
     */
    public void setImageUrl(String imageUrl) {
        imageField.setUrl(imageUrl);
    }

    /**
     * return the name of a file without path.
     */
    private static String basename(String name) {
        return name.replaceAll("^.*[/\\\\]", "");
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * za.co.brewtour.client.application.imageupload.ImageUploadPresenter.MyView
     * #resetForm()
     */
    @Override
    public void resetForm() {
        uploadForm.reset();
    }
}