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55 lines
966 B
C++
55 lines
966 B
C++
#ifndef LAZY_FILL_COMBO_BOX_HPP__
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#define LAZY_FILL_COMBO_BOX_HPP__
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#include <QComboBox>
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class QWidget;
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//
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// Class LazyFillComboBox
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//
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// QComboBox derivative that signals show and hide of the pop up list.
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//
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class LazyFillComboBox
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: public QComboBox
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{
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Q_OBJECT
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public:
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Q_SIGNAL void about_to_show_popup ();
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Q_SIGNAL void popup_hidden ();
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explicit LazyFillComboBox (QWidget * parent = nullptr)
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: QComboBox {parent}
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{
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}
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#if QT_VERSION >= QT_VERSION_CHECK (5, 12, 0)
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void showPopup () override
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{
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Q_EMIT about_to_show_popup ();
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QComboBox::showPopup ();
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}
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void hidePopup () override
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{
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QComboBox::hidePopup ();
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Q_EMIT popup_hidden ();
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}
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#else
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void mousePressEvent (QMouseEvent * e) override
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{
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Q_EMIT about_to_show_popup ();
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QComboBox::mousePressEvent (e);
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}
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void mouseReleaseEvent (QMouseEvent * e) override
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{
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QComboBox::mouseReleaseEvent (e);
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Q_EMIT popup_hidden ();
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}
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#endif
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};
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#endif
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