JTable RowFilter不過濾初始調用

Question

毫無疑問，這將是一個簡單的解決方法，但是像往常一樣，我很沮喪。

我正在嘗試使用JCheckBox過濾掉​​JTable中不可渲染的字體系列名稱。 JTable包含已安裝的字體系列名稱（第0列），示例字母（第1列）和示例數字（第2列）。

第一和第二列以其相應的字體呈現，如果無法呈現單元格中的文本，則使用JTable.setValueAt（Object，int，int）將文本替換為“ non-renderable”。

然后，我使用“不可渲染”作為過濾器。 但是，僅過濾可見行。 當我滾動到表格的底部並應用過濾器時，整個表格都會根據需要進行過濾。

我還注意到，當我移動水平分隔線時，分隔線在更改的單元格上方移動時不會重繪自身。 任何幫助，也將不勝感激。

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

import java.util.*;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;

class run
{
    public static void main(String args[])
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                Viewer viewer = new Viewer();

                JFrame jframe = new JFrame();
                jframe.add(viewer);
                jframe.createBufferStrategy(1);
                jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                jframe.setLocation(50,50);
                jframe.pack();
                jframe.setVisible(true);
            }
        });
    }
}

//----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

class Viewer extends JPanel
{
    final static long serialVersionUID = 0;

    String string_alphabet = "abcdefghijklmnopqrstuvwxyz";
    String string_digits = "0123456789";
    String string_punctuation = "`!:\";\',.-/(){}[]<>?";
    String string_symbols = "~@#$%^&*_+=|\\";

    String string_installedFontsColumnNames[] = {"installed fonts","sample","sample"};
    String string_installedFonts[];

    DefaultTableModel defaultTableModel_installedFonts;
    JTable jtable_installedFonts;

    JSplitPane jsplitPane_horizontal;
    JSplitPane jsplitPane_vertical;

    JCheckBox jcheckBox_nonRenderable;

    TableRowSorter<TableModel> tableRowSorter;

    public Viewer()
    {
        this.setLayout(new BorderLayout());

        JPanel jpanel_installedFonts = new JPanel(new BorderLayout());

        GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();

        string_installedFonts = graphicsEnvironment.getAvailableFontFamilyNames();

        Object object_tableData[][] = new Object[string_installedFonts.length][string_installedFontsColumnNames.length];

        for (int row = 0; row < object_tableData.length; row++)
        {
            Object object_columnData[] = new Object[string_installedFontsColumnNames.length];

            object_columnData[0] = string_installedFonts[row];
            object_columnData[1] = string_alphabet;
            object_columnData[2] = string_digits;

            object_tableData[row] = object_columnData;
        }

        defaultTableModel_installedFonts = new DefaultTableModel(object_tableData,string_installedFontsColumnNames);

        tableRowSorter = new TableRowSorter<TableModel>(defaultTableModel_installedFonts);

        jtable_installedFonts = new JTable(defaultTableModel_installedFonts);
        jtable_installedFonts.setRowSorter(tableRowSorter);

        jtable_installedFonts.getColumnModel().getColumn(0).setCellRenderer(new ColumnRenderer0());
        jtable_installedFonts.getColumnModel().getColumn(1).setCellRenderer(new ColumnRenderer1());
        jtable_installedFonts.getColumnModel().getColumn(2).setCellRenderer(new ColumnRenderer1());

        JScrollPane jscrollPane_installedFonts = new JScrollPane(jtable_installedFonts);

        jpanel_installedFonts.add(jscrollPane_installedFonts,BorderLayout.CENTER);

        JPanel jpanel_visibilityOptions = new JPanel(new GridLayout(1,2));
        jpanel_visibilityOptions.setBackground(Color.gray);

        JPanel jpanel_nonRenderable = new JPanel();
        jpanel_nonRenderable.setBackground(Color.lightGray);

        jcheckBox_nonRenderable = new JCheckBox("hide non-renderable fonts",false);
        jcheckBox_nonRenderable.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent actionEvent)
            {
                RowFilter<Object,Object> filter = null;

                if (jcheckBox_nonRenderable.isSelected())
                {
                    filter = RowFilter.notFilter(RowFilter.regexFilter("non-renderable"));
                }

                tableRowSorter.setRowFilter(filter);
            }
        });

        jpanel_nonRenderable.add(jcheckBox_nonRenderable,BorderLayout.CENTER);

        jpanel_visibilityOptions.add(new JPanel());
        jpanel_visibilityOptions.add(jpanel_nonRenderable);

        jpanel_installedFonts.add(jpanel_visibilityOptions,BorderLayout.SOUTH);

        jsplitPane_horizontal = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,jpanel_installedFonts,new JPanel());
        jsplitPane_horizontal.setBorder(new EmptyBorder(0,0,0,0));

        jsplitPane_vertical = new JSplitPane(JSplitPane.VERTICAL_SPLIT,jsplitPane_horizontal,new JPanel());
        jsplitPane_vertical.setBorder(new EmptyBorder(0,0,0,0));

        this.add(jsplitPane_vertical,BorderLayout.CENTER);
    }
}

//----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

class ColumnRenderer0 implements TableCellRenderer
{
    JLabel jlabel;

    Color color_background;
    Color color_foreground;

    String string_cellText;

    public ColumnRenderer0()
    {
        jlabel = new JLabel();
        jlabel.setBorder(new EmptyBorder(0,2,0,2));
        jlabel.setHorizontalAlignment(JLabel.LEFT);
        jlabel.setOpaque(true);
    }

    public Component getTableCellRendererComponent(JTable jtable, Object object, boolean selected, boolean focus, int row, int column)
    {
        string_cellText = (String)object;

        if (selected)
        {
            color_background = jtable.getSelectionBackground();
            color_foreground = jtable.getSelectionForeground();
        }
        else
        {
            color_background = jtable.getBackground();
            color_foreground = jtable.getForeground();
        }

        jlabel.setText(string_cellText);
        jlabel.setBackground(color_background);
        jlabel.setForeground(color_foreground);

        return jlabel;
    }
}

//----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

class ColumnRenderer1 implements TableCellRenderer
{
    JLabel jlabel;

    Color color_background;
    Color color_foreground;

    String string_cellText;
    String string_fontFamily;

    Font font;
    Font font_jtable;

    public ColumnRenderer1()
    {
        jlabel = new JLabel();
        jlabel.setBorder(new EmptyBorder(0,5,0,5));
        jlabel.setHorizontalAlignment(JLabel.CENTER);
        jlabel.setOpaque(true);
    }

    public Component getTableCellRendererComponent(JTable jtable, Object object, boolean selected, boolean focus, int row, int column)
    {
        string_cellText = (String)object;

        if (selected)
        {
            color_background = jtable.getSelectionBackground();
            color_foreground = jtable.getSelectionForeground();
        }
        else
        {
            color_background = jtable.getBackground();
            color_foreground = jtable.getForeground();
        }

        string_fontFamily = (String)jtable.getValueAt(row,0);

        font_jtable = jtable.getFont();

        font = new Font(string_fontFamily,Font.PLAIN,font_jtable.getSize());

        if (font.canDisplayUpTo(string_cellText) != -1)
        {
            font = new Font(font_jtable.getFamily(),Font.BOLD,font_jtable.getSize());
            string_cellText = "non-renderable";
            jtable.setValueAt(string_cellText,row,column);
            color_foreground = Color.red;

        }

        jlabel.setFont(font);
        jlabel.setText(string_cellText);
        jlabel.setBackground(color_background);
        jlabel.setForeground(color_foreground);

        return jlabel;
    }
}

Answer 1

問題是，在渲染單元之前，文本將保留您最初設置的位置。 不可見的單元格不會呈現，因此不會更新模型。 出於不同的原因，過濾在不同的時間發生。

您不應該在渲染器內部修改模型的狀態，而應該在構建表格模型並相應地設置單元格值時預先確定字體是否可渲染。