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/*
* imageselector.cpp
*
* (c) 2003-2004,2008-2010 by Jeremy Bowman <jmbowman@alum.mit.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
/** @file imageselector.cpp
* Source file for ImageSelector
*/
#include <QApplication>
#include <QBuffer>
#include <QFile>
#include <QImage>
#include <QMessageBox>
#include <QPushButton>
#include "../database.h"
#include "../factory.h"
#include "../importdialog.h"
#include "imageeditor.h"
#include "imageselector.h"
#include "imageutils.h"
#include "imageviewer.h"
/**
* Constructor.
*
* @param dbase The database being edited
* @param parent This widget's parent widget
*/
ImageSelector::ImageSelector(Database *dbase, QWidget *parent)
: QStackedWidget(parent), db(dbase), format(""), changed(false)
{
selectButton = new QPushButton(tr("Select an image"), this);
addWidget(selectButton);
connect(selectButton, SIGNAL(clicked()), this, SLOT(selectImage()));
setMaximumHeight(selectButton->sizeHint().height());
editButtons = new QWidget(this);
QHBoxLayout *layout = Factory::hBoxLayout(editButtons, true);
QPushButton *viewButton = new QPushButton(tr("View"), editButtons);
layout->addWidget(viewButton);
connect(viewButton, SIGNAL(clicked()), this, SLOT(viewImage()));
QPushButton *changeButton = new QPushButton(tr("Change"), editButtons);
layout->addWidget(changeButton);
connect(changeButton, SIGNAL(clicked()), this, SLOT(selectImage()));
QPushButton *deleteButton = new QPushButton(tr("Delete"), editButtons);
layout->addWidget(deleteButton);
connect(deleteButton, SIGNAL(clicked()), this, SLOT(deleteImage()));
addWidget(editButtons);
setCurrentWidget(selectButton);
}
/**
* Specify the field that this widget is to represent.
*
* @param row The ID of the row containing the field (-1 if new)
* @param column The name of the column containing the field
*/
void ImageSelector::setField(int row, const QString &column)
{
rowId = row;
colName = column;
if (rowId == -1) {
changed = true;
}
}
/**
* Get the format of the currently selected image. Valid values are "" (if
* no image has been selected), "JPEG", or "PNG".
*
* @return The format of the selected image
*/
QString ImageSelector::getFormat()
{
return format;
}
/**
* Set the format of the currently selected image. Called by the RowEditor so
* that the format of image data already in the database is known.
*
* @param newFormat The format of the image data in this field
*/
void ImageSelector::setFormat(const QString &newFormat)
{
format = newFormat;
if (!format.isEmpty()) {
setCurrentWidget(editButtons);
}
}
/**
* Select a file from which to load an image. Called when the "Select an
* image" button is clicked.
*/
void ImageSelector::selectImage()
{
ImportDialog dialog(ImportDialog::Image, this);
if (!dialog.exec()) {
return;
}
if (!dialog.import(db)) {
return;
}
QString file = dialog.getPath();
ImageEditor editor(this);
if (!editor.edit(file)) {
return;
}
format = editor.getFormat();
image = editor.getImage();
path = editor.isModified() ? QString("") : file;
changed = true;
setCurrentWidget(editButtons);
}
/**
* Launch a dialog to display the currently selected image. Called when the
* "View" button is clicked.
*/
void ImageSelector::viewImage()
{
if (image.isNull()) {
image = ImageUtils::load(db, rowId, colName, format);
}
ImageViewer viewer(false, this);
viewer.setImage(image);
viewer.exec();
}
/**
* Delete the currently selected image from the current database field,
* setting it back to "no image selected".
*/
void ImageSelector::deleteImage()
{
int choice = QMessageBox::warning(this, qApp->applicationName(),
tr("Delete the current image?"),
QMessageBox::Yes|QMessageBox::No,
QMessageBox::No);
if (choice != QMessageBox::Yes) {
return;
}
image = QImage();
format = "";
changed = true;
setCurrentWidget(selectButton);
}
/**
* Save the field's image data to the database.
*
* @param id The ID of the row being saved to
*/
void ImageSelector::saveImage(int id)
{
if (!changed) {
return;
}
if (!path.isEmpty()) {
// The image wasn't modified, so just copy the file data
QFile file(path);
file.open(QIODevice::ReadOnly);
QByteArray bytes = file.readAll();
file.close();
db->setBinaryField(id, colName, bytes);
}
else if (!format.isEmpty()) {
// The image was modified, so need to encode the in-memory image data
QByteArray bytes;
QBuffer buffer(&bytes);
buffer.open(QIODevice::WriteOnly);
image.save(&buffer, format.toLower().toLatin1());
buffer.close();
db->setBinaryField(id, colName, bytes);
}
}
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