plasma-framework/widgets/pushbutton.h

/*
 *   Copyright 2008 Aaron Seigo <aseigo@kde.org>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the
 *   Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#ifndef PLASMA_PUSHBUTTON_H
#define PLASMA_PUSHBUTTON_H

#include <QGraphicsProxyWidget>

#include <kicon.h>

class KPushButton;

#include <plasma/plasma_export.h>

namespace Plasma
{

class PushButtonPrivate;

/**
 * @class PushButton plasma/widgets/pushbutton.h <Plasma/Widgets/PushButton>
 *
 * @short Provides a plasma-themed KPushButton.
 */
class PLASMA_EXPORT PushButton : public QGraphicsProxyWidget
{
    Q_OBJECT

    Q_PROPERTY(QGraphicsWidget *parentWidget READ parentWidget)
    Q_PROPERTY(QString text READ text WRITE setText)
    Q_PROPERTY(QString image READ image WRITE setImage)
    Q_PROPERTY(QString styleSheet READ styleSheet WRITE setStyleSheet)
    Q_PROPERTY(KPushButton *nativeWidget READ nativeWidget)
    Q_PROPERTY(QAction *action READ action WRITE setAction)
    Q_PROPERTY(QIcon icon READ icon WRITE setIcon)
    Q_PROPERTY(bool checkable READ isCheckable WRITE setCheckable)
    Q_PROPERTY(bool checked READ isChecked WRITE setChecked)
    Q_PROPERTY(bool down READ isDown)

public:
    explicit PushButton(QGraphicsWidget *parent = 0);
    ~PushButton();

    /**
     * Sets the display text for this PushButton
     *
     * @param text the text to display; should be translated.
     */
    void setText(const QString &text);

    /**
     * @return the display text
     */
    QString text() const;

    /**
     * Sets the path to an image to display.
     *
     * @param path the path to the image; if a relative path, then a themed image will be loaded.
     */
    void setImage(const QString &path);

    /**
     * Sets the path to an svg image to display and the id of the used svg element, if necessary.
     *
     * @param path the path to the image; if a relative path, then a themed image will be loaded.
     * @param elementid the id of a svg element.
     *
     * @since 4.4
     */
    void setImage(const QString &path, const QString &elementid);

    /**
     * @return the image path being displayed currently, or an empty string if none.
     */
    QString image() const;

    /**
     * Sets the stylesheet used to control the visual display of this PushButton
     *
     * @param stylesheet a CSS string
     */
    void setStyleSheet(const QString &stylesheet);

    /**
     * @return the stylesheet currently used with this widget
     */
    QString styleSheet();

    /**
     * Associate an action with this IconWidget
     * this makes the button follow the state of the action, using its icon, text, etc.
     * when the button is clicked, it will also trigger the action.
     *
     * @since 4.3
     */
    void setAction(QAction *action);

    /**
     * @return the currently associated action, if any.
     *
     * @since 4.3
     */
    QAction *action() const;

    /**
     * sets the icon for this push button
     * 
     * @param icon the icon to use
     *
     * @since 4.3
     */
    void setIcon(const QIcon &icon);

    /**
     * sets the icon for this push button using a KIcon
     * 
     * @param icon the icon to use
     *
     * @since 4.4
     */
    void setIcon(const KIcon &icon);

    /**
     * @return the icon of this button
     *
     * @since 4.3
     */
    QIcon icon() const;

    /**
     * Sets whether or not this button can be toggled on/off
     *
     * @since 4.3
     */
    void setCheckable(bool checkable);

    /**
     * @return true if the button is checkable
     * @see setCheckable
     * @since 4.4
     */
    bool isCheckable() const;

    /**
     * @return true if the button is checked; requires setIsCheckable(true) to
     * be called
     *
     * @since 4.3
     */
    bool isChecked() const;

    /**
     * @return true if the button is pressed down
     * @since 4.4
     */
    bool isDown() const;

    /**
     * @return the native widget wrapped by this PushButton
     */
    KPushButton *nativeWidget() const;

Q_SIGNALS:
    /**
     * Emitted when the button is pressed down; usually the clicked() signal
     * will suffice, however.
     * @since 4.4
     */
    void pressed();

    /**
     * Emitted when the button is released; usually the clicked() signal
     * will suffice, however.
     * @since 4.4
     */
    void released();

    /**
     * Emitted when the button is pressed then released, completing a click
     */
    void clicked();

    /**
     * Emitted when the button changes state from up to down
     */
    void toggled(bool);

public Q_SLOTS:
    /**
     * Performs a visual click and emits the associated signals
     * @since 4.6
     */
    void click();

    /**
     * Sets whether or not this button is checked. Implies setIsCheckable(true).
     *
     * @since 4.3
     */
    void setChecked(bool checked);

protected:
    void paint(QPainter *painter,
               const QStyleOptionGraphicsItem *option,
               QWidget *widget = 0);
    void resizeEvent(QGraphicsSceneResizeEvent *event);
    void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
    void changeEvent(QEvent *event);
    QSizeF sizeHint(Qt::SizeHint which, const QSizeF & constraint) const;

private:
    Q_PRIVATE_SLOT(d, void syncBorders())
    Q_PRIVATE_SLOT(d, void setPixmap())
    Q_PRIVATE_SLOT(d, void pressedChanged())
    Q_PRIVATE_SLOT(d, void syncToAction())
    Q_PRIVATE_SLOT(d, void clearAction())
    Q_PRIVATE_SLOT(d, void setPalette())

    friend class PushButtonPrivate;
    PushButtonPrivate *const d;
};

} // namespace Plasma

#endif // multiple inclusion guard