115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
// SPDX-FileCopyrightText: 2021 Noah Davis <noahadvs@gmail.com>
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// SPDX-License-Identifier: LGPL-2.1-or-later
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#ifndef GWENVIEW_ZOOMCOMBOBOX_H
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#define GWENVIEW_ZOOMCOMBOBOX_H
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#include <QComboBox>
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#include <lib/gwenviewlib_export.h>
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class QWheelEvent;
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namespace Gwenview
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{
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class ZoomComboBoxPrivate;
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/**
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* QComboBox subclass designed to be somewhat similar to QSpinBox.
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* Allows the user to use non-integer combobox list items,
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* but only accepts integers as custom input.
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*
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* This class is structured in a way so that changes to the zoom done through
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* user interaction are signalled to the outside. On the other hand changes
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* done to the visual state of this class without user interaction will not
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* lead to emitted zoom changes/signals from this class.
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*/
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class GWENVIEWLIB_EXPORT ZoomComboBox : public QComboBox
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{
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Q_OBJECT
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Q_PROPERTY(qreal value READ value WRITE setValue)
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Q_PROPERTY(qreal minimum READ minimum WRITE setMinimum)
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Q_PROPERTY(qreal maximum READ maximum WRITE setMaximum)
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public:
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explicit ZoomComboBox(QWidget *parent = nullptr);
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~ZoomComboBox() override;
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void setActions(QAction *zoomToFitAction, QAction *zoomToFillAction, QAction *actualSizeAction);
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qreal value() const;
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/**
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* Called when the value that is being displayed should change.
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* Calling this method doesn't affect the zoom of the currently viewed image.
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*/
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void setValue(const qreal value);
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qreal minimum() const;
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void setMinimum(const qreal minimum);
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qreal maximum() const;
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void setMaximum(const qreal maximum);
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/// Gets an integer value from text.
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qreal valueFromText(const QString &text, bool *ok = nullptr) const;
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/// Gets appropriately decorated text from an integer value.
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QString textFromValue(const qreal value) const;
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void updateDisplayedText();
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void showPopup() override;
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Q_SIGNALS:
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void zoomChanged(qreal zoom);
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protected:
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bool eventFilter(QObject *watched, QEvent *event) override;
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void focusOutEvent(QFocusEvent *event) override;
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void keyPressEvent(QKeyEvent *event) override;
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/**
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* Makes sure using the mouse wheel on the combobox works as
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* expected even though we sometimes programmatically change
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* the currentIndex() of this ComboBox.
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* @see updateCurrentIndex()
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*/
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void wheelEvent(QWheelEvent *event) override;
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private:
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/**
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* The current index is the row in the popup of the ComboBox that is
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* highlighted.
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* This method updates the current index so it matches the current zoom
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* state of the application.
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* If the zoom value that is currently used doesn't exist as a row in
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* the ComboBox, the currentIndex is set to -1 which hides the highlight.
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*/
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void updateCurrentIndex();
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void moveCurrentIndex(bool moveUp);
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private Q_SLOTS:
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/**
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* This method changes the zoom mode or value of the currently displayed image in response to
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* user interaction with the Combobox' dropdown menu.
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* @param index of the zoom mode or value that the user interacted with.
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*/
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void changeZoomTo(int index);
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/**
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* Sets the index as the fallback when the popup menu is closed without selection in the
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* future and then calls changeZoomTo().
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* @see changeZoomTo()
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*/
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void activateAndChangeZoomTo(int index);
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private:
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const std::unique_ptr<ZoomComboBoxPrivate> d_ptr;
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Q_DECLARE_PRIVATE(ZoomComboBox)
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Q_DISABLE_COPY(ZoomComboBox)
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};
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}
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#endif // GWENVIEW_ZOOMCOMBOBOX_H
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