EclipseRCP开发之如何让表格中的各列随表格的变化始终充满整个表格

先定义一个类：AutoResizeTableLayout.java

package com.winscad.util;

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

import org.eclipse.jface.viewers.ColumnLayoutData;
import org.eclipse.jface.viewers.ColumnPixelData;
import org.eclipse.jface.viewers.ColumnWeightData;
import org.eclipse.jface.viewers.TableLayout;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.events.ControlListener;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;

public class AutoResizeTableLayout extends TableLayout implements ControlListener ...{
    private final Table table;

    private List columns = new ArrayList();

    private boolean autosizing = false;

    public AutoResizeTableLayout(Table table) ...{
        this.table = table;
        table.addControlListener(this);
    }

    public void addColumnData(ColumnLayoutData data) ...{
        columns.add(data);
        super.addColumnData(data);
    }

    public void controlMoved(ControlEvent e) ...{
    }

    public void controlResized(ControlEvent e) ...{
        if (autosizing)
            return;
        autosizing = true;
        try ...{
            autoSizeColumns();
        } finally ...{
            autosizing = false;
        }
    }

    private void autoSizeColumns() ...{
        int width = table.getClientArea().width;

        // XXX: Layout is being called with an invalid value
        // the first time it is being called on Linux.
        // This method resets the layout to null,
        // so we run it only when the value is OK.
        if (width <= 1)
            return;

        TableColumn[] tableColumns = table.getColumns();
        int size = Math.min(columns.size(), tableColumns.length);
        int[] widths = new int[size];
        int fixedWidth = 0;
        int numberOfWeightColumns = 0;
        int totalWeight = 0;

        // First calculate space occupied by fixed columns.
        for (int i = 0; i < size; i++) ...{
            ColumnLayoutData col = (ColumnLayoutData) columns.get(i);
            if (col instanceof ColumnPixelData) ...{
                int pixels = ((ColumnPixelData) col).width;
                widths[i] = pixels;
                fixedWidth += pixels;
            } else if (col instanceof ColumnWeightData) ...{
                ColumnWeightData cw = (ColumnWeightData) col;
                numberOfWeightColumns++;
                int weight = cw.weight;
                totalWeight += weight;
            } else ...{
                throw new IllegalStateException("Unknown column layout data");
            }
        }
        // Do we have columns that have a weight?
        if (numberOfWeightColumns > 0) ...{
            // Now, distribute the rest
            // to the columns with weight.
            int rest = width - fixedWidth;
            int totalDistributed = 0;
            for (int i = 0; i < size; i++) ...{
                ColumnLayoutData col = (ColumnLayoutData) columns.get(i);
                if (col instanceof ColumnWeightData) ...{
                    ColumnWeightData cw = (ColumnWeightData) col;
                    int weight = cw.weight;
                    int pixels = totalWeight == 0 ? 0 : weight * rest
                            / totalWeight;
                    if (pixels < cw.minimumWidth)
                        pixels = cw.minimumWidth;
                    totalDistributed += pixels;
                    widths[i] = pixels;
                }
            }

            // Distribute any remaining pixels
            // to columns with weight.
            int diff = rest - totalDistributed;
            for (int i = 0; diff > 0; i++) ...{
                if (i == size)
                    i = 0;
                ColumnLayoutData col = (ColumnLayoutData) columns.get(i);
                if (col instanceof ColumnWeightData) ...{
                    ++widths[i];
                    --diff;
                }
            }
        }

        for (int i = 0; i < size; i++) ...{
            if (tableColumns[i].getWidth() != widths[i])
                tableColumns[i].setWidth(widths[i]);
        }
    }
}

然后在需要各列自动充满整个表格的表格中加上如下代码：

        AutoResizeTableLayout layout = new AutoResizeTableLayout(tableRegionListInfo);
        tableRegionListInfo.setLayout(layout);
其中tableRegionListInfo为需要各列自动充满整个表格的表格（Table）

最后在表格中的各列中加上如下代码：
layout.addColumnData(new ColumnWeightData(200));
其中200代表此列在表格中所占的比例，例如在另外一列后面设置
layout.addColumnData(new ColumnWeightData(400));则此列在表格中所占的比例是上一个表格的两倍。



这个写的有些麻烦，用GridLayout就可以实现一样的效果，但代码要简单的多