mirror-chatterino2/src/widgets/DraggablePopup.hpp

#pragma once

#include "widgets/BaseWindow.hpp"

#include <QPoint>
#include <QTimer>

#include <memory>

namespace chatterino {

class DraggablePopup : public BaseWindow
{
    Q_OBJECT

public:
    /// DraggablePopup implements the automatic dragging behavior when clicking
    /// anywhere in the window (that doesn't have some other widget).
    ///
    /// If closeAutomatically is set, the window will close when losing focus,
    /// and the window will be frameless.
    DraggablePopup(bool closeAutomatically, QWidget *parent);

protected:
    void mousePressEvent(QMouseEvent *event) override;
    void mouseReleaseEvent(QMouseEvent *event) override;
    void mouseMoveEvent(QMouseEvent *event) override;

    /// Creates a pin button that is scoped to this window.
    /// When clicked, the user can toggle whether the window is pinned.
    /// The window is considered unpinned at the start.
    Button *createPinButton();

    // lifetimeHack_ is used to check that the window hasn't been destroyed yet
    std::shared_ptr<bool> lifetimeHack_;

    // Toggles pin status updates action on focus loss, isPinned_ and the pin
    // button pixmap
    void togglePinned();

private:
    // isMoving_ is set to true if the user is holding the left mouse button down and has moved the mouse a small amount away from the original click point (startPosDrag_)
    bool isMoving_ = false;

    // startPosDrag_ is the coordinates where the user originally pressed the mouse button down to start dragging
    QPoint startPosDrag_;

    // requestDragPos_ is the final screen coordinates where the widget should be moved to.
    // Takes the relative position of where the user originally clicked the widget into account
    QPoint requestedDragPos_;

    // dragTimer_ is called ~60 times per second once the user has initiated dragging
    QTimer dragTimer_;

    Button *pinButton_ = nullptr;
    bool isPinned_ = false;
};

}  // namespace chatterino