com.sap.dirigible.ide.designer.ui.DesignerEditorWidget.java Source code

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Here is the source code for com.sap.dirigible.ide.designer.ui.DesignerEditorWidget.java

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/*******************************************************************************
 * Copyright (c) 2014 SAP AG or an SAP affiliate company. All rights reserved.
 * 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.sap.dirigible.ide.designer.ui;

import org.apache.commons.lang.StringEscapeUtils;
import org.eclipse.rap.rwt.RWT;
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.BrowserFunction;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;

import com.sap.dirigible.ide.logging.Logger;

@SuppressWarnings("unused")
public class DesignerEditorWidget extends Composite {

    private static final long serialVersionUID = -8881201238299386468L;

    private static final Logger logger = Logger.getLogger(DesignerEditorWidget.class);
    private static final String SCRIPT_EVALUATION_FAILED = Messages.DesignerEditorWidget_Script_evaluation_failed;
    private static final int EVALUATE_ATTEMPTS = 5;
    private static final String EDITOR_URL = "/wysiwyg/wysiwyg.html"; //$NON-NLS-1$
    private Browser browser;
    private String text;
    private IDesignerEditorWidgetListener listener;
    private String mode;
    private boolean loaded;

    @SuppressWarnings("serial")
    public DesignerEditorWidget(Composite parent) {
        super(parent, SWT.NONE);
        super.setLayout(new FillLayout());

        browser = new Browser(this, SWT.NONE);
        browser.setUrl(RWT.getRequest().getContextPath() + EDITOR_URL);
        browser.addProgressListener(new ProgressListener() {

            @Override
            public void completed(ProgressEvent event) {
                loaded = true;
                updateWidgetContents();
            }

            @Override
            public void changed(ProgressEvent event) {
                //
            }
        });

        // DO NOT REMOVE THIS
        new BrowserFunction(browser, "saveCalled") { //$NON-NLS-1$
            @Override
            public Object function(Object[] arguments) {
                if (listener != null) {
                    listener.save();
                }
                return null;
            }
        };

        // DO NOT REMOVE THIS
        new BrowserFunction(browser, "dirtyChanged") { //$NON-NLS-1$
            @Override
            public Object function(Object[] arguments) {
                if (listener != null) {
                    listener.dirtyStateChanged((Boolean) arguments[0]);
                }
                return null;
            }
        };

    }

    public void setListener(IDesignerEditorWidgetListener listener) {
        this.listener = listener;
    }

    public void setText(String text) {
        this.text = text;
        if (loaded) {
            updateWidgetContents();
        }
    }

    public String getText() {
        return (String) browser.evaluate("return getEditorContent();"); //$NON-NLS-1$
    }

    public void setDirty(boolean dirty) {
        execute("setDirty", dirty); //$NON-NLS-1$
    }

    private void updateWidgetContents() {
        evaluate("window.setEditorContent", text); //$NON-NLS-1$
    }

    //   public void setMode(String mode) {
    //      evaluate("setMode", mode); //$NON-NLS-1$
    //   }

    private void execute(String function, Object... arguments) {
        browser.execute(buildFunctionCall(function, arguments));
    }

    private Object evaluate(String function, Object... arguments) {
        String script = buildFunctionCall(function, arguments);
        //      for (int i = 0; i < EVALUATE_ATTEMPTS; i++) {
        //         try {
        return browser.evaluate(script);
        //         } catch (Exception ex) {
        //            logger.debug(ex.getMessage(), ex);
        //         }
        //      }

        //      throw new IllegalStateException(SCRIPT_EVALUATION_FAILED + script);
    }

    private String buildFunctionCall(String function, Object... arguments) {
        StringBuilder call = new StringBuilder();
        call.append(function).append('(');
        if (arguments != null) {
            for (Object argument : arguments) {
                String strArg = null;
                if (argument instanceof String) {
                    strArg = prepareStringArgument((String) argument);
                } else {
                    strArg = String.valueOf(argument);
                }
                call.append(strArg).append(","); //$NON-NLS-1$
            }
            if (arguments.length > 0) {
                call.deleteCharAt(call.length() - 1);
            }
        }
        call.append(')');

        return call.toString();
    }

    private String prepareStringArgument(String argument) {
        return "'" + StringEscapeUtils.escapeJavaScript(argument) + "'"; //$NON-NLS-1$ //$NON-NLS-2$
    }
}