examples/draganddrop/README


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Qt supports native drag and drop on all platforms via an extensible
MIME-based system that enables applications to send data to each other in the
most appropriate formats.

Drag and drop can also be implemented for internal use by applications.


The example launcher provided with Qt can be used to explore each of the
examples in this directory.

Documentation for these examples can be found via the Tutorial and Examples
link in the main Qt documentation.


Finding the Qt Examples and Demos launcher
==========================================

On Windows:

The launcher can be accessed via the Windows Start menu. Select the menu
entry entitled "Qt Examples and Demos" entry in the submenu containing
the Qt tools.

On Mac OS X:

For the binary distribution, the qtdemo executable is installed in the
/Developer/Applications/Qt directory. For the source distribution, it is
installed alongside the other Qt tools on the path specified when Qt is
configured.

On Unix/Linux:

The qtdemo executable is installed alongside the other Qt tools on the path
specified when Qt is configured.

On all platforms:

The source code for the launcher can be found in the demos/qtdemo directory
in the Qt package. This example is built at the same time as the Qt libraries,
tools, examples, and demonstrations.
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QPAINTENGINE_OPENGL_P_H
#define QPAINTENGINE_OPENGL_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of the QLibrary class.  This header file may change from
// version to version without notice, or even be removed.
//
// We mean it.
//

#include <private/qpaintengineex_p.h>

QT_BEGIN_NAMESPACE

class QOpenGLPaintEnginePrivate;
class QGLTexture;

class QOpenGLPaintEngineState : public QPainterState
{
public:
    QOpenGLPaintEngineState(QOpenGLPaintEngineState &other);
    QOpenGLPaintEngineState();
    ~QOpenGLPaintEngineState();

    QRegion clipRegion;
    bool hasClipping;
    QRect fastClip;
    uint depthClipId;
};

class QOpenGLPaintEngine : public QPaintEngineEx
{
    Q_DECLARE_PRIVATE(QOpenGLPaintEngine)
public:
    QOpenGLPaintEngine();
    ~QOpenGLPaintEngine();

    bool begin(QPaintDevice *pdev);
    bool end();

    // new stuff
    void clipEnabledChanged();
    void penChanged();
    void brushChanged();
    void brushOriginChanged();
    void opacityChanged();
    void compositionModeChanged();
    void renderHintsChanged();
    void transformChanged();

    void fill(const QVectorPath &path, const QBrush &brush);
    void clip(const QVectorPath &path, Qt::ClipOperation op);

    void setState(QPainterState *s);
    QPainterState *createState(QPainterState *orig) const;
    inline QOpenGLPaintEngineState *state() {
        return static_cast<QOpenGLPaintEngineState *>(QPaintEngineEx::state());
    }
    inline const QOpenGLPaintEngineState *state() const {
        return static_cast<const QOpenGLPaintEngineState *>(QPaintEngineEx::state());
    }


    // old stuff
    void updateState(const QPaintEngineState &state);

    void updatePen(const QPen &pen);
    void updateBrush(const QBrush &brush, const QPointF &pt);
    void updateFont(const QFont &font);
    void updateMatrix(const QTransform &matrix);
    void updateClipRegion(const QRegion &region, Qt::ClipOperation op);
    void updateRenderHints(QPainter::RenderHints hints);
    void updateCompositionMode(QPainter::CompositionMode composition_mode);

    void drawRects(const QRectF *r, int rectCount);
    void drawLines(const QLineF *lines, int lineCount);
    void drawPoints(const QPointF *p, int pointCount);
    void drawRects(const QRect *r, int rectCount);
    void drawLines(const QLine *lines, int lineCount);
    void drawPoints(const QPoint *p, int pointCount);

    void drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr);

    void drawPath(const QPainterPath &path);
    void drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode);
    void drawPolygon(const QPoint *points, int pointCount, PolygonDrawMode mode);
    void drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &s);
    void drawImage(const QRectF &r, const QImage &image, const QRectF &sr,
                   Qt::ImageConversionFlags conversionFlags);
    void drawTextItem(const QPointF &p, const QTextItem &ti);

    void drawEllipse(const QRectF &rect);

#ifdef Q_WS_WIN
    HDC handle() const;
#else
    Qt::HANDLE handle() const;
#endif
    inline Type type() const { return QPaintEngine::OpenGL; }

private:
    void drawPolyInternal(const QPolygonF &pa, bool close = true);
    void drawTextureRect(int tx_width, int tx_height, const QRectF &r, const QRectF &sr,
                         GLenum target, QGLTexture *tex);
    Q_DISABLE_COPY(QOpenGLPaintEngine)
};


QT_END_NAMESPACE

#endif // QPAINTENGINE_OPENGL_P_H