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OpenBoard/src/desktop/UBWindowCaptureDelegate_win...

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/*
* Copyright (C) 2015-2018 Département de l'Instruction Publique (DIP-SEM)
*
* Copyright (C) 2013 Open Education Foundation
*
* Copyright (C) 2010-2013 Groupement d'Intérêt Public pour
* l'Education Numérique en Afrique (GIP ENA)
*
* This file is part of OpenBoard.
*
* OpenBoard 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, version 3 of the License,
* with a specific linking exception for the OpenSSL project's
* "OpenSSL" library (or with modified versions of it that use the
* same license as the "OpenSSL" library).
*
* OpenBoard 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 OpenBoard. If not, see <http://www.gnu.org/licenses/>.
*/
#include "UBWindowCaptureDelegate_win.h"
#include <windows.h>
#include <QDialog>
#include "core/memcheck.h"
UBWindowCaptureDelegate::UBWindowCaptureDelegate(QObject *parent)
:QObject(parent)
, mIsCapturing(false)
, mCancel(false)
, mLastPoint(0, 0)
{
// NOOP
}
UBWindowCaptureDelegate::~UBWindowCaptureDelegate(void)
{
// NOOP
}
const QPixmap UBWindowCaptureDelegate::getCapturedWindow()
{
return mCapturedPixmap;
}
int UBWindowCaptureDelegate::execute()
{
mIsCapturing = true;
mCancel = false;
qApp->installEventFilter(this);
while (mIsCapturing && !mCancel)
{
QPoint curPos = QCursor::pos();
if (mLastPoint != curPos)
{
processPos(curPos);
mLastPoint = curPos;
}
drawSelectionRect();
qApp->processEvents();
}
if (!mCancel)
{
BringWindowToTop(mCurrentWindow);
RedrawWindow(mCurrentWindow, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW | RDW_ALLCHILDREN);
QWaitCondition sleep;
QMutex mutex;
mutex.lock();
sleep.wait(&mutex, 200);
mutex.unlock();
mCapturedPixmap = QPixmap::grabWindow((WId)mCurrentWindow);
return QDialog::Accepted;
}
else
{
RedrawWindow(NULL, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW | RDW_ALLCHILDREN);
return QDialog::Rejected;
}
}
void UBWindowCaptureDelegate::processPos(QPoint pPoint)
{
POINT wPoint;
wPoint.x = pPoint.x();
wPoint.y = pPoint.y();
HWND desktop = GetDesktopWindow();
HWND newWindow = ChildWindowFromPointEx(desktop, wPoint, CWP_SKIPINVISIBLE | CWP_SKIPTRANSPARENT);
if (mCurrentWindow != newWindow && newWindow != desktop)
{
RedrawWindow(NULL, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW | RDW_ALLCHILDREN);
mCurrentWindow = newWindow;
}
}
void UBWindowCaptureDelegate::drawSelectionRect()
{
RECT windowRect;
if (GetWindowRect(mCurrentWindow, &windowRect))
{
HDC hDC;
HPEN hOldPen;
HBRUSH hOldBrush;
hDC = GetDC(NULL);
hOldPen = (HPEN)SelectObject(hDC, CreatePen(PS_SOLID, 5, RGB(255, 0, 0)));
hOldBrush = (HBRUSH)SelectObject(hDC, GetStockObject(NULL_BRUSH));
Rectangle(hDC, windowRect.left + 1, windowRect.top + 1, windowRect.right - 1, windowRect.bottom - 1);
SelectObject(hDC, hOldBrush);
DeleteObject(SelectObject(hDC, hOldPen));
ReleaseDC(NULL, hDC);
}
}
bool UBWindowCaptureDelegate::eventFilter(QObject *target, QEvent *event)
{
Q_UNUSED(target);
// once the application is deactivated, it means that the user clicked somewhere else and we shall
// take the capture
if (event->type() == QEvent::MouseButtonPress || event->type() == QEvent::WindowDeactivate)
{
mIsCapturing = false;
}
else if (event->type() == QEvent::KeyPress)
{
mCancel = true;
}
return true;
}