#include "AdaptionComboBox.h"
#include <QEvent>
#include <QStandardItemModel>

AdaptionComboBox::AdaptionComboBox(QWidget* parent)
	: QComboBox(parent)
	, m_pListWidget(new QListView)
{
	this->setView(m_pListWidget);
	m_pListWidget->installEventFilter(this);
}
AdaptionComboBox::~AdaptionComboBox()
{

}

void AdaptionComboBox::resizeEvent(QResizeEvent *pEvent)
{
	QComboBox::resizeEvent(pEvent);
	UpdateItemSize();
}

bool AdaptionComboBox::eventFilter(QObject* pWatched, QEvent* pEvent)
{
	if (pWatched == m_pListWidget && pEvent->type() == QEvent::Show)
	{
		UpdateItemSize();
	}
	return false;
}
void AdaptionComboBox::UpdateItemSize()
{
	QStandardItemModel* pStandardItemModel =dynamic_cast<QStandardItemModel*>(m_pListWidget->model());
	if (pStandardItemModel == NULL)
		return;

	int nWidth = 0;

	for (int nRow = 0; nRow < pStandardItemModel->rowCount(); ++nRow)
	{
		QModelIndex rModelIndex = pStandardItemModel->index(nRow, 0);
		QString szText = pStandardItemModel->data(rModelIndex).toString();
		QFontMetrics rFontMetrics(m_pListWidget->font());
		int nTemp = rFontMetrics.width(szText);
		if (nTemp > nWidth)
		{
			nWidth = nTemp;
		}
	}
	nWidth += 25;
	if (nWidth < this->width())
	{
		nWidth = this->width();
	}
	m_pListWidget->setFixedWidth(nWidth);
}