11

私はこのコードにJListトークテキストとアイコンを何をしなければならないかを作りたいと思っています。
ラベルのリストを作成し、表にテキストを入れてアイコンを作成するようにアドバイスする人もいますが、それは可能ですか？どのように？

/////////////////埋め込まれたコメントを検索します。

import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.swing.DefaultListModel;
import javax.swing.Icon;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.filechooser.FileSystemView;

public class pan extends JPanel implements DropTargetListener {

private DefaultListModel listModel = new DefaultListModel();
private DropTarget dropTarget;
private JLabel jLabel1;
private JScrollPane jScrollPane1;
private JList list;

/**
 * Create the panel.
 */
public pan() {
    setLayout(null);        
    list = new JList();
    dropTarget = new DropTarget(list, this);
    list.setModel(listModel);
    list.setDragEnabled(true);
    //list.setTransferHandler(new FileTransferHandler());
    jScrollPane1 = new JScrollPane();

    jScrollPane1.setViewportView(list);
    jScrollPane1.setBounds(10, 150, 635, 330);
    add(jScrollPane1);

}
public void dragEnter(DropTargetDragEvent arg0) {
    // nothing
}

public void dragOver(DropTargetDragEvent arg0) {
    // nothing
}

public void dropActionChanged(DropTargetDragEvent arg0) {
    // nothing
}

public void dragExit(DropTargetEvent arg0) {
    // nothing
}

public void drop(DropTargetDropEvent evt) {
    int action = evt.getDropAction();
    evt.acceptDrop(action);
    try {
        Transferable data = evt.getTransferable();
        if (data.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
              List<File> files = (List<File>) data.getTransferDat(DataFlavor.javaFileListFlavor);
            for (File file : files) {

    Icon icon=FileSystemView.getFileSystemView().getSystemIcon(file);
/////////////////listModel.addElement(filepath+icon);///////////////////////want code do this

            }
        }
    } catch (UnsupportedFlavorException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        evt.dropComplete(true);
    }
 }

}


この問題を解決した後、ダブルクリックするとリストに保存されているパスへのデスクトップが開く場合は、各要素にアクションを追加します。

4

1 に答える 1

15

ファイルドラッグリスト

import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import javax.swing.*;
import javax.swing.border.LineBorder;
import javax.swing.filechooser.FileSystemView;
import java.io.*;
import java.util.List;

public class FileDropList extends JPanel implements DropTargetListener {

    private DefaultListModel listModel = new DefaultListModel();
    private DropTarget dropTarget;
    private JLabel jLabel1;
    private JScrollPane jScrollPane1;
    private JList list;

    /**
     * Create the panel.
     */
    public FileDropList() {
        //setLayout(null);        
        list = new JList();
        dropTarget = new DropTarget(list, this);
        list.setModel(listModel);
        list.setDragEnabled(true);
        FileListCellRenderer renderer = new FileListCellRenderer();
        list.setCellRenderer(renderer);
        //list.setTransferHandler(new FileTransferHandler());
        jScrollPane1 = new JScrollPane(list);

        //jScrollPane1.setBounds(10, 150, 635, 330);
        add(jScrollPane1);

    }
    public static void main(String[] args) throws Exception {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                JPanel pan = new FileDropList();
                pan.setBorder(new LineBorder(Color.BLACK));
                JOptionPane.showMessageDialog(null, pan);
            }
        };
        SwingUtilities.invokeLater(r);
    }

    public void dragEnter(DropTargetDragEvent arg0) {
        // nothing
    }

    public void dragOver(DropTargetDragEvent arg0) {
        // nothing
    }

    public void dropActionChanged(DropTargetDragEvent arg0) {
        // nothing
    }

    public void dragExit(DropTargetEvent arg0) {
        // nothing
    }

    public void drop(DropTargetDropEvent evt) {
        int action = evt.getDropAction();
        evt.acceptDrop(action);
        try {
            Transferable data = evt.getTransferable();
            if (data.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                List<File> files = (List<File>) data.getTransferData(DataFlavor.javaFileListFlavor);
                for (File file : files) {
                    listModel.addElement(file);
                }
            }
        } catch (UnsupportedFlavorException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            evt.dropComplete(true);
        }
    }
}

/** A FileListCellRenderer for a File. */
class FileListCellRenderer extends DefaultListCellRenderer {

    private static final long serialVersionUID = -7799441088157759804L;
    private FileSystemView fileSystemView;
    private JLabel label;
    private Color textSelectionColor = Color.BLACK;
    private Color backgroundSelectionColor = Color.CYAN;
    private Color textNonSelectionColor = Color.BLACK;
    private Color backgroundNonSelectionColor = Color.WHITE;

    FileListCellRenderer() {
        label = new JLabel();
        label.setOpaque(true);
        fileSystemView = FileSystemView.getFileSystemView();
    }

    @Override
    public Component getListCellRendererComponent(
            JList list,
            Object value,
            int index,
            boolean selected,
            boolean expanded) {

        File file = (File)value;
        label.setIcon(fileSystemView.getSystemIcon(file));
        label.setText(fileSystemView.getSystemDisplayName(file));
        label.setToolTipText(file.getPath());

        if (selected) {
            label.setBackground(backgroundSelectionColor);
            label.setForeground(textSelectionColor);
        } else {
            label.setBackground(backgroundNonSelectionColor);
            label.setForeground(textNonSelectionColor);
        }

        return label;
    }
}

元の回答

import java.awt.datatransfer.*;
import java.awt.dnd.*;
import javax.swing.*;
import javax.swing.filechooser.FileSystemView;
import java.io.*;
import java.util.List;

public class FileDragList extends JPanel implements DropTargetListener {

    private static final long serialVersionUID = 1L;
    private DefaultListModel listModel = new DefaultListModel();
    private JScrollPane jScrollPane1;
    private JList list;

    /**
     * Create the panel.
     */
    public FileDragList() {
        setLayout(null);        
        list = new JList();
        DropTarget dropTarget = new DropTarget(list, this);
        list.setModel(listModel);
        list.setDragEnabled(true);
        FileListCellRenderer renderer = new FileListCellRenderer();
        list.setCellRenderer(renderer);
        //list.setTransferHandler(new FileTransferHandler());
        jScrollPane1 = new JScrollPane();

        jScrollPane1.setViewportView(list);
        jScrollPane1.setBounds(10, 150, 635, 330);
        add(jScrollPane1);

    }
    public static void main(String[] args) throws Exception {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                JOptionPane.showMessageDialog(null, new FileDragList());
            }
        };
        SwingUtilities.invokeLater(r);
    }

    public void dragEnter(DropTargetDragEvent arg0) {
        // nothing
    }

    public void dragOver(DropTargetDragEvent arg0) {
        // nothing
    }

    public void dropActionChanged(DropTargetDragEvent arg0) {
        // nothing
    }

    public void dragExit(DropTargetEvent arg0) {
        // nothing
    }

    public void drop(DropTargetDropEvent evt) {
        int action = evt.getDropAction();
        evt.acceptDrop(action);
        try {
            Transferable data = evt.getTransferable();
            if (data.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                List<File> files = (List<File>) data.getTransferData(DataFlavor.javaFileListFlavor);
                for (File file : files) {

                    Icon icon=FileSystemView.getFileSystemView().getSystemIcon(file);
                    /////////////////listModel.addElement(filepath+icon);///////////////////////want code do this

                }
            }
        } catch (UnsupportedFlavorException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            evt.dropComplete(true);
        }
    }
}

Icon icon=FileSystemView.getFileSystemView().getSystemIcon(file);

そうそう.. File Browser GUIFileTreeCellRendererのバリアントを試してみてください。

これで、左側のツリーに使用されます。

FileTreeCellRenderer

/** A TreeCellRenderer for a File. */
class FileTreeCellRenderer extends DefaultTreeCellRenderer {

    private FileSystemView fileSystemView;
    private JLabel label;

    FileTreeCellRenderer() {
        label = new JLabel();
        label.setOpaque(true);
        fileSystemView = FileSystemView.getFileSystemView();
    }

    @Override
    public Component getTreeCellRendererComponent(
        JTree tree,
        Object value,
        boolean selected,
        boolean expanded,
        boolean leaf,
        int row,
        boolean hasFocus) {

        DefaultMutableTreeNode node = (DefaultMutableTreeNode)value;
        File file = (File)node.getUserObject();
        label.setIcon(fileSystemView.getSystemIcon(file));
        label.setText(fileSystemView.getSystemDisplayName(file));
        label.setToolTipText(file.getPath());

        if (selected) {
            label.setBackground(backgroundSelectionColor);
            label.setForeground(textSelectionColor);
        } else {
            label.setBackground(backgroundNonSelectionColor);
            label.setForeground(textNonSelectionColor);
        }

        return label;
    }
}

アップデート

上記のレンダラーをリストに適応させる SSCCE。

ここに画像の説明を入力

import java.awt.*;
import javax.swing.*;
import javax.swing.filechooser.FileSystemView;
import java.io.File;

public class FileList {
    public static void main(String[] args) throws Exception {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                JPanel gui = new JPanel(new BorderLayout(2,2));

                File userHome = new File(System.getProperty("user.home"));
                File[] files = userHome.listFiles();
                JList list = new JList(files);
                list.setCellRenderer(new FileListCellRenderer());
                gui.add(new JScrollPane(list));

                JOptionPane.showMessageDialog(null, gui);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

/** A FileListCellRenderer for a File. */
class FileListCellRenderer extends DefaultListCellRenderer {

    private static final long serialVersionUID = -7799441088157759804L;
    private FileSystemView fileSystemView;
    private JLabel label;
    private Color textSelectionColor = Color.BLACK;
    private Color backgroundSelectionColor = Color.CYAN;
    private Color textNonSelectionColor = Color.BLACK;
    private Color backgroundNonSelectionColor = Color.WHITE;

    FileListCellRenderer() {
        label = new JLabel();
        label.setOpaque(true);
        fileSystemView = FileSystemView.getFileSystemView();
    }

    @Override
    public Component getListCellRendererComponent(
        JList list,
        Object value,
        int index,
        boolean selected,
        boolean expanded) {

        File file = (File)value;
        label.setIcon(fileSystemView.getSystemIcon(file));
        label.setText(fileSystemView.getSystemDisplayName(file));
        label.setToolTipText(file.getPath());

        if (selected) {
            label.setBackground(backgroundSelectionColor);
            label.setForeground(textSelectionColor);
        } else {
            label.setBackground(backgroundNonSelectionColor);
            label.setForeground(textNonSelectionColor);
        }

        return label;
    }
}
于 2012-11-12T00:13:56.417 に答える