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screenshotdialog.cpp
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screenshotdialog.cpp
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/*
* Copyright (C) 2011 Christian Kaiser
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "screenshotdialog.h"
#include "../tools/screenshot.h"
#include <QApplication>
#include <QDesktopWidget>
#include <QScrollArea>
#include <QScrollBar>
#include <QLabel>
#include <QHBoxLayout>
#include <QMouseEvent>
#include <QDebug>
ScreenshotDialog::ScreenshotDialog(Screenshot *screenshot, QWidget *parent) :
QDialog(parent)
{
setWindowTitle(tr("Lightscreen Screenshot Viewer"));
setWindowFlags(windowFlags() | Qt::WindowMaximizeButtonHint | Qt::WindowMinimizeButtonHint | Qt::WindowContextHelpButtonHint);
setWhatsThis(tr("You can zoom using the mouse wheel while holding the CTRL key. To return to the default zoom press \"Ctrl-0\"."));
mScrollArea = new QScrollArea(this);
mScrollArea->verticalScrollBar()->installEventFilter(this);
QPalette newPalette = mScrollArea->palette();
newPalette.setBrush(QPalette::Background, QBrush(QPixmap(":/backgrounds/checkerboard")));
mScrollArea->setPalette(newPalette);
mLabel = new QLabel(this);
QHBoxLayout *layout = new QHBoxLayout(this);
mLabel->setPixmap(screenshot->pixmap());
mLabel->setScaledContents(true);
mScrollArea->setAlignment(Qt::AlignCenter);
mScrollArea->setWidget(mLabel);
layout->addWidget(mScrollArea);
layout->setMargin(0);
setLayout(layout);
setCursor(Qt::OpenHandCursor);
mOriginalSize = mLabel->size();
QSize size = (mLabel->pixmap()->size() + QSize(10, 10)); //TODO: Good padding for all platforms
if (size.width() >= qApp->desktop()->availableGeometry().width()) {
size.setWidth(qApp->desktop()->availableGeometry().size().width() - 300);
}
if (size.height() >= qApp->desktop()->availableGeometry().height()) {
size.setHeight(qApp->desktop()->availableGeometry().size().height() - 300);
}
resize(size);
show();
}
void ScreenshotDialog::zoom(int offset)
{
if (offset == 0) {
mLabel->resize(mOriginalSize);
}
else {
QSize newSize = mLabel->size();
newSize.scale(mLabel->size() + QSize(offset, offset), Qt::KeepAspectRatio);
if (offset < 0 && (newSize.width() < 200 || newSize.height() < 200)) {
return;
}
mLabel->resize(newSize);
}
}
void ScreenshotDialog::keyPressEvent(QKeyEvent *event)
{
if (event->key() == Qt::Key_0 && event->modifiers() & Qt::ControlModifier) {
zoom(0);
}
}
void ScreenshotDialog::mousePressEvent(QMouseEvent *event)
{
mMousePos = event->pos();
setCursor(Qt::ClosedHandCursor);
}
void ScreenshotDialog::mouseReleaseEvent(QMouseEvent *event)
{
Q_UNUSED(event)
setCursor(Qt::OpenHandCursor);
}
void ScreenshotDialog::mouseMoveEvent(QMouseEvent *event)
{
QPoint diff = event->pos() - mMousePos;
mMousePos = event->pos();
mScrollArea->verticalScrollBar()->setValue(mScrollArea->verticalScrollBar()->value() - diff.y());
mScrollArea->horizontalScrollBar()->setValue(mScrollArea->horizontalScrollBar()->value() - diff.x());
}
void ScreenshotDialog::closeEvent(QCloseEvent *event)
{
Q_UNUSED(event)
deleteLater();
}
bool ScreenshotDialog::eventFilter(QObject *obj, QEvent *event)
{
if (event->type() == QEvent::Wheel
&& qApp->keyboardModifiers() & Qt::ControlModifier) {
QWheelEvent *wheelEvent = static_cast<QWheelEvent *>(event);
zoom(wheelEvent->delta());
return true;
}
return QObject::eventFilter(obj, event);
}

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