Method SetCount

src/widget.cpp:1974–1992

* Set the number of elements in this matrix. * @note Updates the number of elements/capacity of the real scrollbar. * @param count The number of elements. */

 * @param count The number of elements.
 */
void NWidgetMatrix::SetCount(int count)
{
	this->count = count;

	if (this->sb == nullptr || this->widgets_x == 0) return;

	/* We need to get the number of pixels the matrix is high/wide.
	 * So, determine the number of rows/columns based on the number of
	 * columns/rows (one is constant/unscrollable).
	 * Then multiply that by the height of a widget, and add the pre
	 * and post spacing "offsets". */
	count = CeilDiv(count, this->sb->IsVertical() ? this->widgets_x : this->widgets_y);
	count *= (this->sb->IsVertical() ? this->children.front()->smallest_y : this->children.front()->smallest_x) + this->pip_inter;
	if (count > 0) count -= this->pip_inter; // We counted an inter too much in the multiplication above
	count += this->pip_pre + this->pip_post;
	this->sb->SetCount(count);
	this->sb->SetCapacity(this->sb->IsVertical() ? this->current_y : this->current_x);
	this->sb->SetStepSize(this->sb->IsVertical() ? this->widget_h  : this->widget_w);
}

/**
 * Assign a scrollbar to this matrix.