org.wicketstuff.yui.markup.html.cropp.ImageCropper.java Source code

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Here is the source code for org.wicketstuff.yui.markup.html.cropp.ImageCropper.java

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/**
 * 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 org.wicketstuff.yui.markup.html.cropp;

import org.apache.wicket.Component;
import org.apache.wicket.Response;
import org.apache.wicket.ajax.AjaxEventBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.behavior.AbstractBehavior;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.ResourceModel;
import org.apache.wicket.util.string.JavascriptUtils;

/**
 * Yui imagecropper is a based on {@link http
 * ://developer.yahoo.com/yui/imagecropper/}
 * 
 * @author wickeria at gmail.com
 * 
 */
public abstract class ImageCropper extends Panel {

    private static final long serialVersionUID = 1L;

    private final CallbackBehavior callbackBehavior;

    public ImageCropper(String id, IModel<String> model, final YuiImageCropperSettings settings) {
        super(id, model);

        setOutputMarkupId(true);

        add(new AbstractBehavior() {
            private static final long serialVersionUID = 1L;

            @Override
            public void onRendered(Component component) {
                StringBuffer buffer = new StringBuffer();
                buffer.append("top = " + settings.getTop() + ";");
                buffer.append("left = " + settings.getLeft() + ";");
                buffer.append("height = " + settings.getHeight() + ";");
                buffer.append("width = " + settings.getWidth() + ";");
                buffer.append(
                        "var " + getCropperVar() + " = new YAHOO.widget.ImageCropper('" + getImageId() + "', {");
                buffer.append("initialXY: [left,top],");
                buffer.append("keyTick: " + settings.getKeyTick() + ",");
                buffer.append("shiftKeyTick: " + settings.getShiftKeyTick() + ",");
                buffer.append("minHeight: " + settings.getMinHeight() + ",");
                buffer.append("minWidth: " + settings.getMinWidth() + ",");
                buffer.append("ratio: " + settings.isRatio() + ",");
                buffer.append("initHeight: height,");
                buffer.append("initWidth: width");
                buffer.append("});");

                buffer.append(getCropperVar() + ".on('moveEvent', function() {");
                buffer.append("var region = " + getCropperVar() + ".getCropCoords();");
                buffer.append("top = region.top;");
                buffer.append("left = region.left;");
                buffer.append("height = region.height;");
                buffer.append("width = region.width;");
                buffer.append("});");

                Response response = component.getResponse();
                response.write(JavascriptUtils.SCRIPT_OPEN_TAG);
                response.write("YAHOO.util.Event.onContentReady('" + getImageId() + "',function() {"
                        + buffer.toString() + "});");
                response.write(JavascriptUtils.SCRIPT_CLOSE_TAG);
            }
        });

        add(callbackBehavior = new CallbackBehavior() {
            private static final long serialVersionUID = 1L;

            @Override
            protected void onCropInternal(int top, int left, int height, int width, AjaxRequestTarget target) {
                onCrop(top, left, height, width, target);
            }
        });
        add(newLinkComponent("link").add(newLabelComponent("linkLabel")));
        add(new AjaxLink<Void>("cancel") {
            private static final long serialVersionUID = 1L;

            @Override
            public void onClick(AjaxRequestTarget target) {
                onCancel(target);
            }
        });
    }

    protected IModel<String> getLinkLabelModel() {
        return new ResourceModel("apply");
    }

    protected Component newLabelComponent(String id) {
        return new Label(id, getLinkLabelModel());
    }

    protected WebMarkupContainer newLinkComponent(String id) {
        return new AjaxLink<Void>(id) {
            private static final long serialVersionUID = 1L;

            @Override
            public void onClick(AjaxRequestTarget target) {
                target.prependJavascript("" + callbackBehavior.getEventHandler());
            }
        };
    }

    protected abstract void onCrop(int top, int left, int height, int width, AjaxRequestTarget target);

    protected abstract void onCancel(AjaxRequestTarget target);

    protected String getCropperVar() {
        return "var_" + getMarkupId();
    }

    protected String getImageId() {
        return getDefaultModelObjectAsString();
    }

    private static abstract class CallbackBehavior extends AjaxEventBehavior {

        private static final long serialVersionUID = 1L;

        public CallbackBehavior() {
            super("callbackBehavior");
        }

        @Override
        protected void onComponentTag(final ComponentTag tag) {
        }

        @Override
        public CharSequence getEventHandler() {
            return super.getEventHandler();
        }

        @Override
        protected CharSequence generateCallbackScript(CharSequence partialCall) {
            CharSequence script = super.generateCallbackScript("wicketAjaxGet('" + getCallbackUrl(false)
                    + "&top='+top+'&left='+left+'&height='+height+'&width='+width");
            // + "'");

            return script;
        }

        @Override
        protected final void onEvent(AjaxRequestTarget target) {
            String top = getComponent().getRequest().getParameter("top");
            String left = getComponent().getRequest().getParameter("left");
            String height = getComponent().getRequest().getParameter("height");
            String width = getComponent().getRequest().getParameter("width");
            onCropInternal(Integer.parseInt(top), Integer.parseInt(left), Integer.parseInt(height),
                    Integer.parseInt(width), target);
        }

        protected abstract void onCropInternal(int top, int left, int height, int width, AjaxRequestTarget target);

    }

}