开始关注下UI了

这几天公司安排做UI了,这对于我这个只做过后台的家伙确实是个不错的学习机会.
现在对于UI已经有了一点小感觉了,希望能够继续深入下去.
顺便贴下一个jtable的排序实现(来自http://blog.sina.com.cn/s/blog_4c175081010008ct.html):

代码如下：一共两个类SortManager、UpDownArrow。用法很简单，只要把你的JTable对象放到SortManager 对象的参数里就可以了，剩下的仔细看看就会明白的！
SortManager sortManager = new SortManager(JTable对象);

package zww;

import java.awt.*;
import java.awt.event.*;
import java.util.*;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;




public class SortManager implements TableModelListener {

    final static Icon upIcon = new UpDownArrow(0);
    final static Icon downIcon = new UpDownArrow(1);

    private JTable table;

    private TableModel dataModel;
    private int sortColumn;

    private Row rows[];

    private boolean ascending;
    private int sortableColumns[];

    public SortManager(JTable jtable) {
        rows = null;
        ascending = true;
        sortableColumns = null;
        table = jtable;
        int i=0;
        int length=jtable.getModel().getColumnCount();
        final int[] columns=new int[length];
        for(;i<length;i++){
            columns[i]=i;
        }
        sortableColumns=columns;
        initialize();
    }

    public SortManager(JTable jtable, int i) {
        rows = null;
        ascending = true;
        sortableColumns = null;
        table = jtable;
        sortColumn = i;
        initialize();
    }

    public SortManager(JTable jtable, int ai[]) {
        this(jtable, ai[0]);
        sortableColumns = (int[]) ai.clone();
    }

    public void initialize() {
        dataModel = table.getModel();
        ((AbstractTableModel) dataModel).addTableModelListener(this);
        addMouseListener(table);
        JTableHeader jtableheader = table.getTableHeader();
        jtableheader.setDefaultRenderer(createHeaderRenderer());
        if (table.getRowCount() > 0) {
            reinitialize();
        }
    }

    protected TableCellRenderer createHeaderRenderer() {
        DefaultTableCellRenderer defaultHeaderRenderer = new SortHeaderRenderer();
        defaultHeaderRenderer.setHorizontalAlignment(0);
        defaultHeaderRenderer.setHorizontalTextPosition(2);
        return defaultHeaderRenderer;
    }

    public void reinitialize() {
        rows = null;
        if (table.getRowCount() > 0) {
            rows = new Row[table.getRowCount()];
            for (int i = 0; i < rows.length; i++) {
                rows[i] = new Row();
                rows[i].index = i;
            }

            if (columnIsSortable(sortColumn)) {
                sort();
            }
        }
    }

    private boolean columnIsSortable(int i) {
        if (rows != null) {
            if (sortableColumns != null) {
                for (int j = 0; j < sortableColumns.length; j++) {
                    if (i == sortableColumns[j]) {
                        return true;
                    }
                }

            } else {
                return true;
            }
        }
        return false;
    }

    public void addMouseListener(final JTable table) {
        table.getTableHeader().addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent mouseevent) {
                int i = table.columnAtPoint(mouseevent.getPoint());
                int j = table.convertColumnIndexToModel(i);
                //转换出用户想排序的列和底层数据的列，然后判断
                if (!columnIsSortable(j)) {
                    return;
                }
                if (j == sortColumn) {
                    ascending = !ascending;
                } else {
                    ascending = true;
                    sortColumn = j;
                }
                sort();
            }

        });
    }

    public void sort() {
        if (rows == null) {
            return;
        } else {

            ((AbstractTableModel) dataModel).removeTableModelListener(this);
            Arrays.sort(rows);
            resetData();
            ((AbstractTableModel) dataModel).fireTableDataChanged();
            ((AbstractTableModel) dataModel).addTableModelListener(this);
            table.revalidate();
            table.repaint();
            return;
        }
    }

    public void resetData() {
        Vector data=new Vector(dataModel.getRowCount());
        int i=0;
        for(;i<dataModel.getRowCount();i++){
            int j=0;
            final Vector vv=new Vector(dataModel.getColumnCount());
            for(;j<dataModel.getColumnCount();j++){
                vv.add(dataModel.getValueAt(i,j));
            }
            data.add(vv);
        }
        i=0;
        for(;i<rows.length;i++){
            if(rows[i].index!=i){
                int j=0;
                final Vector vv=(Vector)data.get(rows[i].index);
                for(;j<dataModel.getColumnCount();j++){
                    dataModel.setValueAt(vv.get(j),i,j);
                }
            }
        }
    }

    public void tableChanged(TableModelEvent tablemodelevent) {
        reinitialize();
    }


    private class SortHeaderRenderer extends DefaultTableCellRenderer {
        public Component getTableCellRendererComponent(JTable jtable,
                Object obj, boolean flag, boolean flag1, int i, int j) {
            if (jtable != null) {
                JTableHeader jtableheader = jtable.getTableHeader();
                if (jtableheader != null) {
                    setForeground(jtableheader.getForeground());
                    setBackground(jtableheader.getBackground());
                    setFont(jtableheader.getFont());
                }
            }
            setText(obj != null ? obj.toString() : "");
            int k = jtable.convertColumnIndexToModel(j);
            if (k == sortColumn) {
                setIcon(ascending ? SortManager.upIcon : SortManager.downIcon);
            } else {
                setIcon(null);
            }
            setBorder(UIManager.getBorder("TableHeader.cellBorder"));
            return this;
        }
    }


    private class Row implements Comparable {
        private Row() {
        }

        public int compareTo(Object obj) {
            Row row = (Row) obj;
           
            java.text.Collator cnCollator = java.text.Collator.getInstance(Locale.getDefault());
            Object obj1 = dataModel.getValueAt(index, sortColumn);
            Object obj2 = dataModel.getValueAt(row.index, sortColumn);
            if (ascending) {
             if (!(obj1 instanceof Comparable)) {
                 return -1;
             }
             if (!(obj2 instanceof Comparable)) {
                 return 1;
             } else {
                     return cnCollator.compare(obj1,obj2);
             }
         }
         if (!(obj1 instanceof Comparable)) {
             return 1;
         }
         if (!(obj2 instanceof Comparable)) {
             return -1;
         } else {
                 return cnCollator.compare(obj2,obj1);
         }

        }

        public int index;
    }

}

package zww;

import java.awt.*;

import javax.swing.*;

public class UpDownArrow implements Icon {
    private  int size = 12;

    public static final int UP = 0;
    public static final int DOWN = 1;
    private int direction;

    public UpDownArrow(int i) {
        direction = i;
    }

    public int getIconHeight() {
        return size;
    }

    public int getIconWidth() {
        return size;
    }

    public void paintIcon(Component component, Graphics g, int i, int j) {
        int k = i + size / 2;
        int l = i + 1;
        int i1 = (i + size) - 2;
        int j1 = j + 1;
        int k1 = (j + size) - 2;
        Color color = (Color) UIManager.get("controlDkShadow");
        if (direction == 0) {
            g.setColor(Color.white);
            g.drawLine(l, k1, i1, k1);
            g.drawLine(i1, k1, k, j1);
            g.setColor(color);
            g.drawLine(l, k1, k, j1);
        } else {
            g.setColor(color);
            g.drawLine(l, j1, i1, j1);
            g.drawLine(l, j1, k, k1);
            g.setColor(Color.white);
            g.drawLine(i1, j1, k, k1);
        }
    }
}