82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
// Copyright(c) 2017-2019 Alejandro Sirgo Rica & Contributors
|
|
//
|
|
// This file is part of Flameshot.
|
|
//
|
|
// Flameshot 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 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// Flameshot 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 Flameshot. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#include "draggablewidgetmaker.h"
|
|
#include <QMouseEvent>
|
|
|
|
DraggableWidgetMaker::DraggableWidgetMaker(QObject* parent)
|
|
: QObject(parent)
|
|
{}
|
|
|
|
void DraggableWidgetMaker::makeDraggable(QWidget* widget)
|
|
{
|
|
widget->installEventFilter(this);
|
|
}
|
|
|
|
bool DraggableWidgetMaker::eventFilter(QObject* obj, QEvent* event)
|
|
{
|
|
auto widget = static_cast<QWidget*>(obj);
|
|
|
|
// based on https://stackoverflow.com/a/12221360/964478
|
|
switch (event->type()) {
|
|
case QEvent::MouseButtonPress: {
|
|
auto mouseEvent = static_cast<QMouseEvent*>(event);
|
|
|
|
m_isPressing = false;
|
|
m_isDragging = false;
|
|
if (mouseEvent->button() == Qt::LeftButton) {
|
|
m_isPressing = true;
|
|
m_mousePressPos = mouseEvent->globalPos();
|
|
m_mouseMovePos = m_mousePressPos;
|
|
}
|
|
} break;
|
|
case QEvent::MouseMove: {
|
|
auto mouseEvent = static_cast<QMouseEvent*>(event);
|
|
|
|
if (m_isPressing) {
|
|
QPoint widgetPos = widget->mapToGlobal(widget->pos());
|
|
QPoint eventPos = mouseEvent->globalPos();
|
|
QPoint diff = eventPos - m_mouseMovePos;
|
|
QPoint newPos = widgetPos + diff;
|
|
|
|
widget->move(widget->mapFromGlobal(newPos));
|
|
|
|
if (!m_isDragging) {
|
|
QPoint totalMovedDiff = eventPos - m_mousePressPos;
|
|
if (totalMovedDiff.manhattanLength() > 3) {
|
|
m_isDragging = true;
|
|
}
|
|
}
|
|
|
|
m_mouseMovePos = eventPos;
|
|
}
|
|
} break;
|
|
case QEvent::MouseButtonRelease: {
|
|
if (m_isDragging) {
|
|
m_isPressing = false;
|
|
m_isDragging = false;
|
|
event->ignore();
|
|
return true;
|
|
}
|
|
} break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return QObject::eventFilter(obj, event);
|
|
}
|