sdrangel/sdrgui/gui/framelesswindowresizer.h

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2022 Jon Beniston, M7RCE //
// //
// 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 as version 3 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef SDRGUI_FRAMELESSWINDOWRESIZER_H_
#define SDRGUI_FRAMELESSWINDOWRESIZER_H_
#include "export.h"
#include <QEvent>
#include <QMouseEvent>
#include <QWidget>
// Class to allow frameless windows (Qt::FramelessWindowHint) to be resized
// by clicking and draging on the border
// The window needs to forward the mousePressEvent, mouseReleaseEvent, mouseMoveEvent
// and leaveEvent events to this class
// Child widgets should have mouse tracking enabled, so cursor can be controlled properly
// This can be achieved by calling enableChildMouseTracking
class SDRGUI_API FramelessWindowResizer
{
private:
QWidget *m_widget; // Widget to be resized
bool m_vResizing; // Whether we are resizing vertically
bool m_hResizing;
bool m_vMove; // Whether we are moving vertically
bool m_hMove;
QPoint m_mouseOffsetToPos;// Offset from mouse position to top/left of window
QPoint m_initialMousePos; // Position of mouse when resize started
QRect m_initRect; // Dimensions of widget when resize started
QPoint m_origBottomRight; // So we do not "push" the widget when resizing from top or left
const QCursor *m_cursor; // Current cursor
const QCursor m_vCursor; // Ideally static, but when run:
const QCursor m_hCursor; // QPixmap: Must construct a QGuiApplication before a QPixmap
const QCursor m_bCursor;
const QCursor m_fCursor;
public:
FramelessWindowResizer(QWidget *widget);
void enableChildMouseTracking();
void mousePressEvent(QMouseEvent* event);
void mouseReleaseEvent(QMouseEvent* event);
void mouseMoveEvent(QMouseEvent* event);
void leaveEvent(QEvent* event);
const int m_gripSize = 2; // Size in pixels of the border of the window that can be clicked in to resize it
protected:
bool mouseOnTopBorder(QPoint pos) const;
bool mouseOnBottomBorder(QPoint pos) const;
bool mouseOnLeftBorder(QPoint pos) const;
bool mouseOnRightBorder(QPoint pos) const;
bool mouseOnBorder(QPoint pos) const;
void setCursor(const QCursor &cursor);
void clearCursor();
};
#endif // SDRGUI_FRAMELESSWINDOWRESIZER_H_