Source: kdualcolorbtn.h


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/* This file is part of the KDE libraries
   Copyright (C) 1999 Daniel M. Duley <mosfet@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/
#ifndef __KDUALCOLORBTN_H
#define __KDUALCOLORBTN_H

#include <qbitmap.h>
#include <qbrush.h>
#include <qwidget.h>

/**
 * KDualColorButton allows the user to select two cascaded colors (usually a
 * foreground and background color). Other features include drag and drop
 * from other KDE color widgets, a reset to black and white control, and a
 * swap colors control.
 *
 * When the user clicks on the the foreground or background rectangle the
 * rectangle is first sunken and the currentChanged() signal is emitted.
 * Further clicks will present a color dialog and emit either the fgChanged()
 * or bgChanged() if a new color is selected.
 *
 * Note: With drag and drop when dropping a color the current selected color
 * will be set, while when dragging a color it will use whatever color
 * rectangle the mouse was pressed inside.
 *
 * @short A widget for selecting two related colors.
 * @author Daniel M. Duley <mosfet@kde.org>
 */
class KDualColorButton : public QWidget
{
    Q_OBJECT
public:
    enum DualColor{Foreground, Background};
    /**
     * Constructs a new KDualColorButton using the default black and white
     * colors.
     *
     */
    KDualColorButton(QWidget *parent=0, const char *name=0);
    /**
     * Constructs a new KDualColorButton with the supplied foreground and
     * background colors.
     */
    KDualColorButton(const QColor &fgColor, const QColor &bgColor,
                     QWidget *parent=0, const char *name=0);
    ~KDualColorButton();
    /**
     * Returns the current foreground color.
     */
    QColor foreground();
    /**
     * Returns the current background color.
     */
    QColor background();
    /**
     * Returns the current color item selected by the user.
     */
    KDualColorButton::DualColor current();
    /**
     * Returns the color of the selected item.
     */
    QColor currentColor();
    /**
     * Returns the minimum size needed to display the widget and all it's
     * controls.
     */
    virtual QSize sizeHint() const;
public slots:
    /**
     * Sets the foreground color.
     */
    void slotSetForeground(const QColor &c);
    /**
     * Sets the background color.
     */
    void slotSetBackground(const QColor &c);
    /**
     * Sets the current selected color item.
     */
    void slotSetCurrent(KDualColorButton::DualColor s);
    /**
     * Sets the color of the selected item.
     */
    void slotSetCurrentColor(const QColor &c);
signals:
    /**
     * Emitted when the foreground color is changed.
     */
    void fgChanged(const QColor &c);
    /**
     * Emitted when the background color is changed.
     */
    void bgChanged(const QColor &c);
    /**
     * Emitted when the user changes the current color selection.
     */
    void currentChanged(KDualColorButton::DualColor s);
protected:
    /**
     * Sets the supplied rectangles to the proper size and position for the
     * current widget size. You can reimplement this to change the layout
     * of the widget. Restrictions are that the swap control will always
     * be at the top right, the reset control will always be at the bottom
     * left, and you must leave at least a 14x14 space in those corners.
     */
    virtual void metrics(QRect &fgRect, QRect &bgRect);
    virtual void paintEvent(QPaintEvent *ev);
    virtual void mousePressEvent(QMouseEvent *ev);
    virtual void mouseMoveEvent(QMouseEvent *ev);
    virtual void mouseReleaseEvent(QMouseEvent *ev);
    // Dnd
    virtual void dragEnterEvent(QDragEnterEvent *ev);
    virtual void dropEvent(QDropEvent *ev);
private:
    QBitmap *arrowBitmap;
    QPixmap *resetPixmap;
    QBrush fg, bg;
    QPoint mPos;
    bool dragFlag, miniCtlFlag;
    DualColor curColor, tmpColor;

    class KDualColorPrivate;
    KDualColorPrivate *d;
};

#endif

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