optimizeColumnWidths();

void

YQPkgList::optimizeColumnWidths()

{

    int numCol = 0;

    int visibleSpace = 0;

    //int cWidths_old[6] = {0,};

    int s2cWidths[6] = {0,};

    int s2cWidthsSum = 0;

    int k = 0;

    if (this->topLevelItemCount() > 50) return; // DO NOT OPTIMZE, IF LIST IS ALREADY TO LARGE (IT'S TOO SLOW)

    numCol = this->columnCount();

    if (numCol < 1) return;

    // SET OPTIMAL COLUMN WIDTHS (SIZED-TO-CONTENT):

    for (k=0; k<numCol; k++)

    {

        //cWidths_old[k] = this->columnWidth(k);	// backup current column width

        this->resizeColumnToContents(k);

        s2cWidths[k] = this->columnWidth(k);

        s2cWidthsSum += s2cWidths[k];

    }

    // CHECK IF WE HAVE LESS VISIBLE SPACE THAN WE NEED:

    visibleSpace = this->viewport()->width();

    if (s2cWidthsSum >= visibleSpace)

    {

        // WHAT DO WE DO IF THERE IS NOT ENOUGH SPACE TO SHOW ALL COLUMNS WITH OPTIMAL WIDTHS ?

        // SOLUTION 1: Restore initial widths (do nothing)

        //for (k=0; k<numCol; k++)

        //    this->setColumnWidth( k, cWidths_old[k]);

        // SOLUTION 2: Only reduce width of the "summary"-column; if this is not enough, we will get a horizontal scroll bar

        int newSummaryWidth = visibleSpace - s2cWidthsSum + s2cWidths[ summaryCol() ];

        if (newSummaryWidth < 100)

            newSummaryWidth = 100;

        this->setColumnWidth( summaryCol(), newSummaryWidth);

    }

    else	// WE HAVE ENOUGH VISIBLE SPACE

    {

        // DISTRIBUTE REMAINING VISIBLE SPACE TO ALL COLUMNS (except the satusIcon-column):

        // PRO:		LOOKS MUCH BETTER

        // CONTRA:	WE WILL WASTE SPACE, IF THE WINDOW WIDTH WILL BE REDUCED

        // CALCULATE ADDITIONAL CULUMN WIDTHS:

        int addSpace = (visibleSpace - s2cWidthsSum) / (numCol - 1);

        int addSpaceLC = (visibleSpace - s2cWidthsSum) % (numCol - 1);	// last column (without statusIcon columns)

        // SET NEW COLUMN WIDTHS:

        int lindex = numCol - 1;

        if (statusCol() == lindex)

            lindex--;

        for (k=0; k<lindex; k++)

        {

            if (k != statusCol())

                this->setColumnWidth( k, s2cWidths[k] + addSpace );

        }

        this->setColumnWidth( lindex, s2cWidths[lindex] + addSpace + addSpaceLC );

    }

    /* NOTE: There is currently no way to get the optimal column widths without setting them.

     *       => depending on the available visible space and the selected strategy, column widths may be set TWO times in this function.

     *       Although this is no "nice" solution, we don't have to worry about visual effects. It's really fast and therefore not visible for the user ;-).

     */

}

    /**

     * Optimizes the column widths depending on content and the available space.

     **/

    void optimizeColumnWidths();