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SWT:淡入淡出消息提示框，无需用户干预。

[西部农民] — Wed, 12 Oct 2011 02:48:00 GMT

Important：该类有诸多不尽人意的地方，读者如果要用，请自行完善，但是至少值得一试。
原代码是一个老外写的在桌面右下角弹出消息提示的一个类，我进行了改写。
任何改进，希望你能不吝分享。

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Scrollable;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.wb.swt.SWTResourceManager;

/**
* 具有淡入淡出效果且不需要用户点击关闭的消息提示框。
* @author ggfan@amarsoft
*
*/
public class Notifier {
    private static final int DISPLAY_TIME = 2000;

    private static final int FADE_TIMER = 50;

    private static final int FADE_IN_STEP = 30;

    private static final int FADE_OUT_STEP = 8;

    private static final int FINAL_ALPHA = 225;

    public static int DEFAULT_WIDTH = 150;

    public static  int DEFAULT_HEIGHT = 60;

    private static Color _titleFgColor = SWTResourceManager.getColor(40, 73, 97);

    private static Color _fgColor = _titleFgColor;

    private static Color _bgFgGradient = SWTResourceManager.getColor(226, 239, 249);

    private static Color _bgBgGradient = SWTResourceManager.getColor(177, 211, 243);

    private static Color _borderColor = SWTResourceManager.getColor(40, 73, 97);

    private static Image _oldImage;
    // TODO Scrollable可能不合适
    public static void notify(Scrollable scrollable, final String msg) {

        final Shell parentShell = scrollable.getShell();
        final Shell newShell = new Shell(parentShell, SWT.NO_FOCUS | SWT.NO_TRIM);
        newShell.setLayout(new FillLayout());
        newShell.setForeground(_fgColor);
        newShell.setBackground(_bgBgGradient);
        newShell.setBackgroundMode(SWT.INHERIT_FORCE);
  scrollable.addDisposeListener(new DisposeListener(){

public void widgetDisposed(DisposeEvent e) {

newShell.dispose();

}

});

        final Composite inner = new Composite(newShell, SWT.NONE);
        FillLayout layout = new FillLayout();
        layout.marginWidth = 20;
        layout.marginHeight = 20;
        inner.setLayout(layout);

        newShell.addListener(SWT.Resize, new Listener() {
            public void handleEvent(Event event) {
                try {
                    Rectangle rect = newShell.getClientArea();
                    Image newImage = new Image(Display.getDefault(), Math.max(1, rect.width), rect.height);
                    GC gc = new GC(newImage);
                    // 背景
                    gc.setForeground(_bgFgGradient);
                    gc.setBackground(_bgBgGradient);
                    gc.fillGradientRectangle(rect.x, rect.y, rect.width, rect.height, true);
                    // 边框
                    gc.setLineWidth(2);
                    gc.setForeground(_borderColor);
                    gc.drawRectangle(rect.x + 1, rect.y + 1, rect.width - 2, rect.height - 2);

                    gc.dispose();
                    newShell.setBackgroundImage(newImage);
                    if (_oldImage != null) {
                        _oldImage.dispose();
                    }
                    _oldImage = newImage;
                } catch (Exception err) {
                    err.printStackTrace();
                }
            }
        });

        Label text = new Label(inner, SWT.WRAP | SWT.CENTER);
        Font tf = text.getFont();
        FontData tfd = tf.getFontData()[0];
        tfd.setStyle(SWT.BOLD);
        tfd.height = 8;
        text.setFont(SWTResourceManager.getFont(tfd.getName(), 8, SWT.NORMAL));
        text.setForeground(_fgColor);
        text.setText(msg);

        newShell.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        if (Display.getDefault().getActiveShell() == null || Display.getDefault().getActiveShell().getMonitor() == null) {
            return;
        }
        newShell.setLocation(computePoint(scrollable));
        newShell.setAlpha(0);
        newShell.setVisible(true);

        fadeIn(newShell);
    }

    // TODO 当有滚动条出现的时候是否能够居中？
    private static Point computePoint(Scrollable scrollable) {
        Point p = scrollable.toDisplay(scrollable.getClientArea().x, scrollable.getClientArea().y);
        int w = scrollable.getClientArea().width;
        int h = scrollable.getClientArea().height;
        p.x += w / 2 - DEFAULT_WIDTH / 2 ;
        p.y += h / 2 - DEFAULT_HEIGHT / 2;
        return p;
    }

    private static void fadeIn(final Shell _shell) {
        Runnable run = new Runnable() {
            @Override
            public void run() {
                try {
                    if (_shell == null || _shell.isDisposed()) {
                        return;
                    }

                    int cur = _shell.getAlpha();
                    cur += FADE_IN_STEP;

                    if (cur > FINAL_ALPHA) {
                        _shell.setAlpha(FINAL_ALPHA);
                        startTimer(_shell);
                        return;
                    }

                    _shell.setAlpha(cur);
                    Display.getDefault().timerExec(FADE_TIMER, this);
                } catch (Exception err) {
                    err.printStackTrace();
                }
            }
        };
        Display.getDefault().timerExec(FADE_TIMER, run);
    }

    private static void startTimer(final Shell _shell) {
        Runnable run = new Runnable() {

            @Override
            public void run() {
                try {
                    if (_shell == null || _shell.isDisposed()) {
                        return;
                    }

                    fadeOut(_shell);
                } catch (Exception err) {
                    err.printStackTrace();
                }
            }

        };
        Display.getDefault().timerExec(DISPLAY_TIME, run);

    }

    private static void fadeOut(final Shell _shell) {
        final Runnable run = new Runnable() {

            @Override
            public void run() {
                try {
                    if (_shell == null || _shell.isDisposed()) {
                        return;
                    }

                    int cur = _shell.getAlpha();
                    cur -= FADE_OUT_STEP;

                    if (cur <= 0) {
                        _shell.setAlpha(0);
                         if (_oldImage != null) {
                             _oldImage.dispose();
                         }
                        _shell.dispose();
                        return;
                    }

                    _shell.setAlpha(cur);

                    Display.getDefault().timerExec(FADE_TIMER, this);

                } catch (Exception err) {
                    err.printStackTrace();
                }
            }

        };
        Display.getDefault().timerExec(FADE_TIMER, run);

    }
}

[西部农民] 2011-10-12 10:48 发表评论

SWT:关键字高亮编辑

[西部农民] — Wed, 12 Oct 2011 02:42:00 GMT

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.LineStyleEvent;
import org.eclipse.swt.custom.LineStyleListener;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.custom.VerifyKeyListener;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.events.TraverseListener;
import org.eclipse.swt.events.VerifyEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.wb.swt.SWTResourceManager;

/**
* 关键字高亮编辑器。This class is a simple customized widget that wrappes a  {@link org.eclipse.swt.custom.StyledText StyledText}.
* It consumes a keyword array and highlight them.
* @author ggfan@amarsoft
*
*/
public class KeywordsHighlightingEditor extends Composite{

    private Color color = SWTResourceManager.getColor(SWT.COLOR_BLUE);

    private Color variableColor = SWTResourceManager.getColor(SWT.COLOR_DARK_GREEN);

    private String[] keywords;

    private StyledText st;

    public void setKeywordsColor(Color color){
        this.color = color;
    }

    public void setKeywordsBgColor(Color color){

    }

    public IObservableValue observerContent(){
        return SWTObservables.observeText(st, SWT.Modify);
    }

    public KeywordsHighlightingEditor(Composite parent, String[] keywords) {
        super(parent, SWT.NONE);
        this.keywords = keywords;
        this.setLayout(new FillLayout());
        st = new StyledText(this, SWT.WRAP | SWT.BORDER | SWT.V_SCROLL);
        // 禁止回车键换行
        st.addVerifyKeyListener(new VerifyKeyListener(){
            public void verifyKey(VerifyEvent event) {
                if(event.keyCode == SWT.CR){
                    event.doit = false;
                }
            }
        });
        // Tab键失去焦点而不是插入制表符
        st.addTraverseListener(new TraverseListener(){
            public void keyTraversed(TraverseEvent e) {
                if (e.detail == SWT.TRAVERSE_TAB_NEXT || e.detail == SWT.TRAVERSE_TAB_PREVIOUS) {
                    e.doit = true;
                }
            }
        });
        st.addLineStyleListener(new SQLSegmentLineStyleListener());
    }

    private class SQLSegmentLineStyleListener implements LineStyleListener {

        @Override
        public void lineGetStyle(LineStyleEvent event) {
            if(keywords == null || keywords.length == 0){
                return;
            }
            List<StyleRange> styles = new ArrayList<StyleRange>();
            int start = 0;
            int length = event.lineText.length();
            while (start < length) {
                if (Character.isLetter(event.lineText.charAt(start))) {
                    StringBuffer buf = new StringBuffer();
                    int i = start;
                    for (; i < length && Character.isLetter(event.lineText.charAt(i)); i++) {
                        buf.append(event.lineText.charAt(i));
                    }
                    if(Arrays.asList(keywords).contains(buf.toString())) {
                        styles.add(new StyleRange(event.lineOffset + start, i - start, color, null, SWT.BOLD));
                    }
                    start = i;
                }else if (event.lineText.charAt(start) == '#') {
                    StringBuffer buf = new StringBuffer();
                    buf.append('#');
                    int i = start + 1;
                    for (; i < length && Character.isLetter(event.lineText.charAt(i)); i++) {
                        buf.append(event.lineText.charAt(i));
                    }
                    if(buf.toString().matches("#[a-zA-Z]+\\d?")) {
                        styles.add(new StyleRange(event.lineOffset + start, i - start, variableColor, null, SWT.NORMAL));
                    }
                    start = i;
                }
                else{
                    start ++;
                }
            }
            event.styles = (StyleRange[]) styles.toArray(new StyleRange[0]);
        }

    }

}

[西部农民] 2011-10-12 10:42 发表评论

SWT: 改写CLabel使其支持Gif动画

[西部农民] — Tue, 11 Oct 2011 08:28:00 GMT

摘要: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->package amarsoft.rcp.base.widgets;import java.io.File;import java.io.FileInputStream;im... 阅读全文

[西部农民] 2011-10-11 16:28 发表评论