ktablenoscrollmodel.java

ktable 是一个由java开发的,对控制报表的项目,它最大的特点是使用独特的算法,能支持巨大的报表(千万以上?).

/*
 * Created on 16.10.2005
 *
 * 
 */
package de.kupzog.ktable;


/**
 * Table model that implements columnwidths based on weights, always showing all
 * columns and thus preventing H_SCROLL. <p>
 * When resizing, the space is shifted between the columns. 
 * 
 * @author Lorenz Maierhofer <[e-mail]>
 */
public abstract class KTableNoScrollModel extends KTableSortedModel {
    // the factor used to calculate "promille" values of the current control width that are stored.
    private int FACTOR = 10000;
    
    private KTable _table;
    
    public KTableNoScrollModel(KTable table) {
        _table = table;
    }
    
    public void initialize() {
        super.initialize();
        int weightSum=1;
        for (int i=0; i<getColumnCount(); i++){
            int initialWeight = getInitialColumnWidth(i);
            weightSum+=initialWeight;
        }
        
        // initialize with % values.
        for (int i=0; i<getColumnCount(); i++){
            super.setColumnWidth(i, (int)((getInitialColumnWidth(i)/(double)weightSum)*FACTOR));
        }
        int pts = 0;
        for (int i=0; i<getColumnCount(); i++)
            pts+=super.getColumnWidth(i);
        FACTOR = pts;
    }
    
//    private int getOptimalWidth(int col) {
//        int optWidth = 1;
//        GC gc = new GC(_table.getDisplay());
//        for (int r=0; r<getFixedRowCount(); r++) {
//            int optW = getCellRenderer(col, r).getOptimalWidth(gc, col,r,getContentAt(col,r), true, this);
//            if (optWidth<optW) optWidth=optW;
//        }
//        for (int r=_table.m_TopRow; r<=_table.m_RowsFullyVisible; r++) {
//            int optW = getCellRenderer(col, r).getOptimalWidth(gc, col,r,getContentAt(col,r), false, this);
//            if (optWidth<optW) optWidth=optW;
//        }
//        gc.dispose();
//        return optWidth;
//    }
    
    /*
     * 
     */
    public void setTable(KTable table) {
        _table = table;
    }
    
    /*
     *  (Kein Javadoc)
     * @see de.kupzog.ktable.KTableModel#getColumnWidth(int)
     */
    public int getColumnWidth(int col) {        
        double percent = super.getColumnWidth(col)/((double)FACTOR); 
        if (_table!=null && !_table.isDisposed()) {
            return (int)((_table.getClientArea().width-1)*percent);
        } else
            return (int)Math.round(percent*100);
    }
    
    /* (non-Javadoc)
     * @see de.kupzog.ktable.KTableModel#setColumnWidth(int, int)
     */
    public void setColumnWidth(int col, int value) {
        int tableWidth = _table.getClientArea().width;
        double percent = (value+1)/(double)tableWidth;
        if (col==getColumnCount()-1) {
            int weightsum = super.getColumnWidth(col)+super.getColumnWidth(col-1);
            super.setColumnWidth(col, (int)(percent*FACTOR));
            super.setColumnWidth(col-1, weightsum-((int)(percent*FACTOR)));
        } else {
            int weightsum = super.getColumnWidth(col)+super.getColumnWidth(col+1);
            super.setColumnWidth(col, (int)(percent*FACTOR));
            super.setColumnWidth(col+1, weightsum-((int)(percent*FACTOR)));
        }
    }
}