label_stack.h

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#ifndef LABEL_STACK_H
#define LABEL_STACK_H
 
#include <QLabel>
#include <QStack>
#include <QElapsedTimer>
#include <QTimer>

class LabelStack : public QLabel
{
    Q_OBJECT
public:
    explicit LabelStack(QWidget *parent = 0);

    void setTemporaryContext(const int ctx);

    void pushText(const QString &text, int ctx, const QString &tooltip = QString());

    void setShrinkable(bool shrinkable = true);
 
protected:
    void mousePressEvent(QMouseEvent *event) override;

    void mouseReleaseEvent(QMouseEvent *event) override;

    void mouseDoubleClickEvent(QMouseEvent *event) override;

    void mouseMoveEvent(QMouseEvent *event) override;

    void contextMenuEvent(QContextMenuEvent *event) override;

    void paintEvent(QPaintEvent *event) override;
 
private:
    typedef struct _StackItem {
        QString text;    
        QString tooltip; 
        int     ctx;     
    } StackItem;
 
    int temporary_ctx_;          
    QList<StackItem> labels_;    
    bool shrinkable_;            
    QElapsedTimer temporary_epoch_; 
    QTimer temporary_timer_;     

    void fillLabel();
 
 
signals:
    void toggleTemporaryFlash(bool enable);

    void mousePressedAt(const QPoint &global_pos, Qt::MouseButton button);
 
public slots:
    void popText(int ctx);
 
private slots:
    void updateTemporaryStatus();
};
 
#endif // LABEL_STACK_H