hydrograph.ui.dataviewer.find.StyledTextEventListener.java Source code

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Here is the source code for hydrograph.ui.dataviewer.find.StyledTextEventListener.java

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/*******************************************************************************
 * Copyright 2017 Capital One Services, LLC and Bitwise, 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 hydrograph.ui.dataviewer.find;

import hydrograph.ui.logging.factory.LogFactory;

import org.apache.commons.lang.StringUtils;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.slf4j.Logger;

/**
 * The Class StyledTextEventListener
 * This Listener is used in View Data Find window text area. 
 * @author Bitwise
 *
 */
public class StyledTextEventListener {

    private static final Logger logger = LogFactory.INSTANCE.getLogger(StyledTextEventListener.class);
    public final static StyledTextEventListener INSTANCE = new StyledTextEventListener();

    private StyledTextEventListener() {
    }

    /**
     *  The function will move cursor in reverse direction.
     * @param styledText
     * @param text
     * @param prevLineIndex
     * @param nextLineIndex
     * @return int[]
     */
    public int[] prevButtonListener(StyledText styledText, String text, int prevLineIndex, int nextLineIndex) {
        logger.debug("StyledText prev button selected");
        if (prevLineIndex == 0) {
            prevLineIndex = styledText.getText().length() - 1;
        }
        int lastIndex = StringUtils.lastIndexOf(StringUtils.lowerCase(styledText.getText()),
                StringUtils.lowerCase(text), prevLineIndex - 1);

        if (lastIndex < 0) {
            prevLineIndex = styledText.getText().length() - 1;
            prevLineIndex = StringUtils.lastIndexOf(StringUtils.lowerCase(styledText.getText()),
                    StringUtils.lowerCase(text), prevLineIndex - 1);
            styledText.setSelection(prevLineIndex);
            setStyledRange(styledText, prevLineIndex, text.length(), null,
                    Display.getDefault().getSystemColor(SWT.COLOR_DARK_GRAY));
            nextLineIndex = prevLineIndex + 1;
            return new int[] { prevLineIndex, nextLineIndex };
        } else {
            setStyledRange(styledText, lastIndex, text.length(), null,
                    Display.getDefault().getSystemColor(SWT.COLOR_DARK_GRAY));
            styledText.setSelection(lastIndex);
            prevLineIndex = lastIndex;
            nextLineIndex = lastIndex + 1;
            styledText.redraw();
        }
        return new int[] { prevLineIndex, nextLineIndex };
    }

    /**
     * The function will move the cursor in forward direction.
     * @param styledText
     * @param text
     * @param prevLineIndex
     * @param nextLineIndex
     * @return int[]
     */
    public int[] nextButtonListener(StyledText styledText, String text, int prevLineIndex, int nextLineIndex) {
        logger.debug("StyledText next button selected");
        int txtIndex = StringUtils.indexOf(StringUtils.lowerCase(styledText.getText()), StringUtils.lowerCase(text),
                nextLineIndex);

        if (txtIndex < 0) {
            nextLineIndex = 0;
            prevLineIndex = StringUtils.indexOf(StringUtils.lowerCase(styledText.getText()),
                    StringUtils.lowerCase(text), nextLineIndex);
            nextLineIndex = prevLineIndex + 1;
            styledText.setSelection(prevLineIndex);
            setStyledRange(styledText, prevLineIndex, text.length(), null,
                    Display.getDefault().getSystemColor(SWT.COLOR_DARK_GRAY));
            return new int[] { prevLineIndex, nextLineIndex };
        } else {
            setStyledRange(styledText, txtIndex, text.length(), null,
                    Display.getDefault().getSystemColor(SWT.COLOR_DARK_GRAY));
            styledText.setSelection(txtIndex);
            prevLineIndex = txtIndex;
            nextLineIndex = txtIndex + 1;
            styledText.redraw();
        }
        return new int[] { prevLineIndex, nextLineIndex };
    }

    /**
     * The function will change selected text background color.
     * @param styledText
     * @param text
     * @param foreground
     * @param background
     */
    public void allButtonListener(StyledText styledText, String text, Color foreground, Color background,
            Label label) {
        logger.debug("StyledText All button selected");
        int index = 0;
        int recordCount = 0;
        if (styledText == null) {
            return;
        }
        for (; index < styledText.getText().length();) {
            int lastIndex = StringUtils.indexOf(StringUtils.lowerCase(styledText.getText()),
                    StringUtils.lowerCase(text), index);

            if (lastIndex < 0) {
                return;
            } else {
                setStyledRange(styledText, lastIndex, text.length(), null, background);
                index = lastIndex + 1;
                recordCount++;
                label.setVisible(true);
                label.setText("Matching count - " + recordCount);
            }
        }
    }

    /**
     * The function will change selected text foreground and background color.
     * @param styledText
     * @param startIndex
     * @param textLength
     * @param foreground
     * @param background
     */
    private void setStyledRange(StyledText styledText, int startIndex, int textLength, Color foreground,
            Color background) {
        StyleRange[] prevRanges = new StyleRange[1];
        prevRanges[0] = new StyleRange(startIndex, textLength, foreground, background);
        styledText.replaceStyleRanges(startIndex, textLength, prevRanges);
    }
}