pictureviewer.cpp

基于Qt技术的图片浏览器

/************************************************************************************************************
Copyright(C) 2008 Hailing Zhao.
This widget may be used under the terms of the GNU General Public License versions 3.0 as published by the 
Free Software Foundation and appearing in the file LICENSE.GPL included in the packaging of this file. 
Please review the following information to ensure GNU General Public Licensing requirements will be met: 
<http://www.gnu.org/licenses/>.
**************************************************************************************************************/

#include "pictureviewer.h"
#include <QDir>
#include <QStringList>
#include <QImage>
#include <QPalette>
#include <QModelIndex>
#include <QToolTip>
#include <QKeyEvent>
#include <QCleanlooksStyle>

PictureViewer::PictureViewer(QWidget *parent)
    : QWidget(parent)
{
	setupUi(this);

    QApplication::setStyle(new QCleanlooksStyle);

	// initialize address comboBox
	comboBox->setEditable(true);
	comboBox->setInsertPolicy(QComboBox::InsertAtTop);
	comboBox->addItem(QIcon(":/folder.bmp"), "C:/Documents and Settings/ehailzh/My Documents/My Pictures");
	comboBox->installEventFilter(this);
	comboBox->setAttribute(Qt::WA_Hover);

	// initialize listWidget
	listView->setViewMode(QListView::IconMode);
	listView->setIconSize(QSize(80,60));
	listView->setResizeMode(QListView::Adjust);
	listModel = new PictureListModel(this);
	listView->setModel(listModel);
	listModel->addPictures("C:/Documents and Settings/ehailzh/My Documents/My Pictures");
	connect(listView->selectionModel(), SIGNAL(currentChanged(QModelIndex, QModelIndex)),
			this, SLOT(listItemChanged(QModelIndex, QModelIndex)));

	//initialize label
	label = new QLabel(this);
	label->setScaledContents(true);
	showPicture(listModel->index(0));

	// Note: I have to use setWidget method to make scrollArea's scrollBars
	// visible according to label's size. If only drag label into scrollArea,
	// scrollBars won't appear.
	scrollArea->setBackgroundRole(QPalette::Dark);
	scrollArea->setWidgetResizable(false);
	scrollArea->setWidget(label);

	// initialize button
	toolButtonGo->setIcon(QIcon(":/go.bmp"));
	toolButtonPre->setIcon(QIcon(":/left.png"));
	toolButtonNext->setIcon(QIcon(":/right.png"));
	toolButtonGo->setToolTip(tr("Go to folder"));
	toolButtonPre->setToolTip(tr("Previous picture"));
	toolButtonNext->setToolTip(tr("Next picture"));
	toolButtonGo->setAttribute(Qt::WA_Hover);
	toolButtonPre->setAttribute(Qt::WA_Hover);
	toolButtonNext->setAttribute(Qt::WA_Hover);
}

PictureViewer::~PictureViewer()
{

}

void PictureViewer::listItemChanged(const QModelIndex &current, const QModelIndex &previous)
{
	showPicture(current);
}

void PictureViewer::on_toolButtonGo_clicked()
{
	QString dir = comboBox->currentText();
	listModel->addPictures(dir);
	QModelIndex index = listModel->index(0);
	showPicture(index);
	if (index.isValid() && (comboBox->findText(dir, Qt::MatchFixedString) == -1))
	{
		if (comboBox->count() > 5)
		{
			comboBox->removeItem(comboBox->count()-1);
		}
		comboBox->insertItem(0, QIcon(":/folder.bmp"), dir);
	}
}

void PictureViewer::on_toolButtonPre_clicked()
{
	QModelIndex current = listView->currentIndex();
	QModelIndex preIndex = current.sibling(current.row()-1, current.column());
	showPicture(preIndex);
}

void PictureViewer::on_toolButtonNext_clicked()
{
	QModelIndex current = listView->currentIndex();
	QModelIndex nextIndex = current.sibling(current.row()+1, current.column());
	showPicture(nextIndex);
}

void PictureViewer::showPicture(const QModelIndex &index)
{
	if (!index.isValid())
		return;

	QPixmap pixmap = listModel->data(index, Qt::UserRole).value<QPixmap>();
	label->setPixmap(pixmap);
	label->adjustSize();
	listView->setCurrentIndex(index);
}

bool PictureViewer::eventFilter(QObject *watched, QEvent *event)
{
	if (watched == comboBox)
	{
		if (event->type() == QEvent::KeyPress)
		{
			QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
			qDebug("pressed key = 0x%x\n", keyEvent->key());

			if (keyEvent->key() == Qt::Key_Return) {
				on_toolButtonGo_clicked();
				return true;
			}
		}
	}
	return QWidget::eventFilter(watched, event);
}