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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file GUI/View/Widget/WidgetMoverButton.h
//! @brief Defines class WidgetMoverButton.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2021
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#ifndef BORNAGAIN_GUI_VIEW_WIDGET_WIDGETMOVERBUTTON_H
#define BORNAGAIN_GUI_VIEW_WIDGET_WIDGETMOVERBUTTON_H
#include <QMap>
#include <QPropertyAnimation>
#include <QScrollArea>
#include <QTimer>
#include <QToolButton>
//! Button to move a widget vertically in a layout.
//!
//! Used for the "move layer" feature in the sample editor.
//!
//! When the button is pressed, the parent layout of the widget is deactivated, and the widget is
//! moved to the position where the pressed mouse cursor is moved.
//! When the mouse is released, the layout is reactivated and signal finishedMoving() is
//! emitted.
//! The caller remains responsible for reordering the widgets - no reordering is done in here.
class WidgetMoverButton : public QToolButton {
Q_OBJECT
public:
//! Create a widget mover button.
//!
//! If the widget shall not be able to be dragged on the top position, this can be defined by
//! ignoreOnTop (the number of widgets at the top of the layout which shall not be affected by
//! the reordering). In the case of the layer moving, the topmost Form (the sample
//! properties) shall not be part of reordering.
WidgetMoverButton(QWidget* parent, QWidget* widgetToMove, int ignoreOnTop = 0);
protected:
void mousePressEvent(QMouseEvent* event) override;
void mouseReleaseEvent(QMouseEvent* event) override;
void mouseMoveEvent(QMouseEvent* event) override;
signals:
void startingToMove();
void finishedMoving(QWidget* widgetToMove, QWidget* moveAboveThisWidget);
private:
void scrollParent(bool up);
bool m_pressed = false;
bool m_started = false;
int m_global_mouse_downY;
QLayout* m_layout_to_deactivate = nullptr;
QWidget* m_widget_to_move;
QWidget* m_drop_above_this_widget;
int m_original_widgetY;
int m_y_of_first_relevant_widget;
int m_ignore_on_top;
QTimer m_drag_scroll_timer;
QScrollArea* m_scroll_area;
QPoint m_hot_spot; //!< The mouse-down coordinates in the widget to move
QMap<QWidget*, QPropertyAnimation*> m_animations;
};
#endif // BORNAGAIN_GUI_VIEW_WIDGET_WIDGETMOVERBUTTON_H
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