SWT JFace 拖曳效果

演示代码如下：

复制代码 代码如下:

package swt_jface.demo11;

import org.eclipse.swt.SWT;

import org.eclipse.swt.dnd.DND;

import org.eclipse.swt.dnd.DragSource;

import org.eclipse.swt.dnd.DragSourceEvent;

import org.eclipse.swt.dn开发者_自学开发d.DragSourceListener;

import org.eclipse.swt.dnd.DropTarget;

import org.eclipse.swt.dnd.DropTargetEvent;

import org.eclipse.swt.dnd.DropTargetListener;

import org.eclipse.swt.dnd.TextTransfer;

import org.eclipse.swt.dnd.Transfer;

import org.eclipse.swt.events.DisposeEvent;

import org.eclipse.swt.events.DisposeListener;

import org.eclipse.swt.graphics.Font;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Label;

import org.eclipse.swt.widgets.MessageBox;

import org.eclipse.swt.widgets.Shell;

public class WordJumbles {

    Display display = new Display();

    Shell shell = new Shell(display);

    String word;

    Label[] labelsRowOne;

    Label[] labelsRowTwo;

    Font font = new Font(display, "Arial", 18, SWT.BOLD);

    public void setDragSource(final Label label) {

        int operations = DND.DROP_MOVE;

        final DragSource dragSource = new DragSource(label, operations);

        Transfer[] formats = new Transfer[] { TextTransfer.getInstance()};

        dragSource.setTransfer(formats);

  编程客栈;      dragSource.addDragListener(new DragSourceListener() {

            public void dragStart(DragSourceEvent event) {

                if (label.getText().length() == 0)

                    event.doit = false;

            }

&n编程客栈bsp;  编程客栈         public void dragSetData(DragSourceEvent event) {

                if (TextTransfer.getInstance().isSupportedType(event.dataType))

                    event.data = label.getText();

            }

            public void dragFinished(DragSourceEvent event) {

                if (eventiKRdjAwfrW.doit == true || event.detail == DND.DROP_MOVE) {

                    label.setText("");

                }

            }

        });

        label.addDisposeListener(new DisposeListener() {

            public void widgetDisposed(DisposeEvent e) {

                dragSource.dispose();

            }

        });

   &nbsiKRdjAwfrWp;}

    public void setDropTarget(final Label label) {

        int operations = DND.DROP_MOVE;

        final DropTarget dropTarget = new DropTarget(label, operations);

        Transfer[] formats = new Transfer[] { TextTransfer.getInstance()};

        dropTarget.setTransfer(formats);

        dropTarget.addDropListener(new DropTargetListener() {

            public void dragEnter(DropTargetEvent event) {

                if(label.getText().length() != 0)

                    event.detail = DND.DROP_NONE;

            }

            public void dragLeave(DropTargetEvent event) {

            }

            public void dragOperationChanged(DropTargetEvent event) {

            }

            public void dragOver(DropTargetEvent event) {

            }

            public void drop(DropTargetEvent event) {

                if (TextTransfer

                    .getInstance()

                    .isSupportedType(event.currentDataType)) {

                    String text = (String) event.data;

                    label.setText(text);

                    check();

                }

            }

            public void dropAccept(DropTargetEvent event) {

            }

        });

        label.addDisposeListener(new DisposeListener() {

            public void widgetDisposed(DisposeEvent e) {

                dropTarget.dispose();

            }

        });

    }

    private void check() {

        for(int i=0; i<word.length(); i++) {

            if(! labelsRowTwo[i].getText().equals(word.charAt(i) + ""))

                return;

        }

        MessageBox messageBox = new MessageBox(shell);

        messageBox.setMessage("Success!");

        messageBox.open();

    }

    public WordJumbles(String word) {

        this.word = word;

        shell.setText("Word Jumbles");

        labelsRowOne = new Label[word.length()];

        labelsRowTwo = new Label[word.length()];

        int width = 40;

        int[] randomPermutation = { 5, 2, 6, 3, 1, 4, 0 };

        for (int i = 0; i < word.length(); i++) {

            final Label labelRowOne = new Label(shell, SWT.BORDER);

            labelsRowOne[i] = labelRowOne;

            labelRowOne.setBounds(10 + width * i, 10, width - 5, width - 5);

            labelRowOne.setFont(font);

            labelRowOne.setText(word.charAt(randomPermutation[i]) + "");

            labelRowOne.setAlignment(SWT.CENTER);

            setDragSource(labelRowOne);

            setDropTarget(labelRowOne);

            final Label labelRowTwo = new Label(shell, SWT.BORDER);

            labelsRowTwo[i] = labelRowTwo;

            labelRowTwo.setBounds(

                10 + width * i,

                20 + width,

                width - 5,

                width - 5);

            labelRowTwo.setBackground(display.getSystemColor(SWT.COLOR_WHITE));

            labelRowTwo.setFont(font);

            labelRowTwo.setAlignment(SWT.CENTER);

            setDragSource(labelRowTwo);

            setDropTarget(labelRowTwo);

        }

        shell.pack();

        shell.open();

        while (!shell.isDisposed()) {

            if (!display.readAndDispatch()) {

                display.sleep();

            }

        }

        display.dispose();

    }

    public static void main(String[] args) {

        new WordJumbles("ECLIPSE");

    }

}