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Diffstat (limited to 'kolourpaint/kpselectiondrag.cpp')
| -rw-r--r-- | kolourpaint/kpselectiondrag.cpp | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/kolourpaint/kpselectiondrag.cpp b/kolourpaint/kpselectiondrag.cpp new file mode 100644 index 00000000..23ab9a4e --- /dev/null +++ b/kolourpaint/kpselectiondrag.cpp @@ -0,0 +1,294 @@ + +/* + Copyright (c) 2003,2004,2005 Clarence Dang <[email protected]> + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#define DEBUG_KP_SELECTION_DRAG 0 + + +#include <kpselectiondrag.h> + +#include <qdatastream.h> + +#include <kdebug.h> + +#include <kppixmapfx.h> +#include <kpselection.h> + + +// public static +const char * const kpSelectionDrag::selectionMimeType = "application/x-kolourpaint-selection"; + + +kpSelectionDrag::kpSelectionDrag (QWidget *dragSource, const char *name) + : QImageDrag (dragSource, name) +{ +} + +kpSelectionDrag::kpSelectionDrag (const QImage &image, QWidget *dragSource, const char *name) + : QImageDrag (image, dragSource, name) +{ +} + +kpSelectionDrag::kpSelectionDrag (const kpSelection &sel, QWidget *dragSource, const char *name) + : QImageDrag (dragSource, name) +{ + setSelection (sel); +} + +kpSelectionDrag::~kpSelectionDrag () +{ +} + + +// public +void kpSelectionDrag::setSelection (const kpSelection &sel) +{ + if (!sel.pixmap ()) + { + kdError () << "kpSelectionDrag::setSelection() without pixmap" << endl; + return; + } + + m_selection = sel; + + // OPT: an awful waste of memory storing image in both selection and QImage + + // HACK: need to set image else QImageDrag::format() lies + setImage (kpPixmapFX::convertToImage (*m_selection.pixmap ())); +} + +// protected +bool kpSelectionDrag::holdsSelection () const +{ + return bool (m_selection.pixmap ()); +} + + +// public virtual [base QMimeSource] +const char *kpSelectionDrag::format (int which) const +{ +#if DEBUG_KP_SELECTION_DRAG && 0 + kdDebug () << "kpSelectionDrag::format(" << which << ")" << endl; +#endif + const char *ret = QImageDrag::format (which); + if (ret) + { + #if DEBUG_KP_SELECTION_DRAG && 0 + kdDebug () << "\tQImageDrag reports " << ret << endl; + #endif + return ret; + } + + int i; + for (i = 0; QImageDrag::format (i); i++) + ; + +#if DEBUG_KP_SELECTION_DRAG && 0 + kdDebug () << "\tend of QImageDrag format list at " << i << endl; +#endif + + if (i == which) + { + #if DEBUG_KP_SELECTION_DRAG && 0 + kdDebug () << "\treturning own mimetype" << endl; + #endif + return kpSelectionDrag::selectionMimeType; + } + else + { + #if DEBUG_KP_SELECTION_DRAG && 0 + kdDebug () << "\treturning non-existent" << endl; + #endif + return 0; + } +} + +// public virtual [base QMimeSource] +// Don't need to override in Qt 3.2 (the QMimeSource base will work) +// but we do so just in case QImageDrag later decides to override it. +bool kpSelectionDrag::provides (const char *mimeType) const +{ +#if DEBUG_KP_SELECTION_DRAG + kdDebug () << "kpSelectionDrag::provides(" << mimeType << ")" << endl; +#endif + + if (!mimeType) + return false; + + return (!strcmp (mimeType, kpSelectionDrag::selectionMimeType) || + QImageDrag::provides (mimeType)); +} + +// public virtual [base QMimeSource] +QByteArray kpSelectionDrag::encodedData (const char *mimeType) const +{ +#if DEBUG_KP_SELECTION_DRAG + kdDebug () << "kpSelectionDrag::encodedData(" << mimeType << ")" << endl; +#endif + + if (!mimeType) + return QByteArray (); + + if (!strcmp (mimeType, kpSelectionDrag::selectionMimeType)) + { + QByteArray ba; + QDataStream stream (ba, IO_WriteOnly); + + #if DEBUG_KP_SELECTION_DRAG + kdDebug () << "\twant it as kpSelection in QByteArray" << endl; + #endif + + if (holdsSelection ()) + { + #if DEBUG_KP_SELECTION_DRAG + kdDebug () << "\t\thave selection - return it" << endl; + #endif + stream << m_selection; + } + else + { + #if DEBUG_KP_SELECTION_DRAG + kdDebug () << "\t\thave image - call kpSelectionDrag::decode(QImage)" << endl; + #endif + QImage image; + if (kpSelectionDrag::decode (this, image/*ref*/)) + { + #if DEBUG_KP_SELECTION_DRAG + kdDebug () << "\t\t\tok - returning sel with image w=" + << image.width () + << " h=" + << image.height () + << endl; + #endif + + QPixmap pixmap = kpPixmapFX::convertToPixmapAsLosslessAsPossible (image); + + stream << kpSelection (kpSelection::Rectangle, + QRect (0, 0, pixmap.width (), pixmap.height ()), + pixmap); + } + else + { + kdError () << "kpSelectionDrag::encodedData(" << mimeType << ")" + << " kpSelectionDrag(QImage) could not decode data into QImage" + << endl; + stream << kpSelection (); + } + } + + return ba; + } + else + { + #if DEBUG_KP_SELECTION_DRAG + kdDebug () << "\twant it as QImage in QByteArray" << endl; + #endif + + return QImageDrag::encodedData (mimeType); + } +} + + +// public static +bool kpSelectionDrag::canDecode (const QMimeSource *e) +{ +#if DEBUG_KP_SELECTION_DRAG + kdDebug () << "kpSelectionDrag::canDecode()" << endl; +#endif + + if (!e) + return false; + + return (e->provides (kpSelectionDrag::selectionMimeType) || + QImageDrag::canDecode (e)); +} + + +// public static +bool kpSelectionDrag::decode (const QMimeSource *e, QImage &img) +{ +#if DEBUG_KP_SELECTION_DRAG + kdDebug () << "kpSelectionDrag::decode(QImage)" << endl; +#endif + if (!e) + return false; + + return (QImageDrag::canDecode (e) && // prevents X errors, jumps based on unitialised values... + QImageDrag::decode (e, img/*ref*/)); +} + +// public static +bool kpSelectionDrag::decode (const QMimeSource *e, kpSelection &sel, + const kpPixmapFX::WarnAboutLossInfo &wali) +{ +#if DEBUG_KP_SELECTION_DRAG + kdDebug () << "kpSelectionDrag::decode(kpSelection)" << endl; +#endif + if (!e) + return false; + + if (e->provides (kpSelectionDrag::selectionMimeType)) + { + #if DEBUG_KP_SELECTION_DRAG + kdDebug () << "\tmimeSource provides selection - just return it in QByteArray" << endl; + #endif + QByteArray data = e->encodedData (kpSelectionDrag::selectionMimeType); + QDataStream stream (data, IO_ReadOnly); + + // (no need for wali as kpSelection's by definition only support QPixmap's) + stream >> sel; + } + else + { + #if DEBUG_KP_SELECTION_DRAG + kdDebug () << "\tmimeSource doesn't provide selection - try image" << endl; + #endif + + QImage image; + if (kpSelectionDrag::decode (e, image/*ref*/)) + { + #if DEBUG_KP_SELECTION_DRAG + kdDebug () << "\tok w=" << image.width () << " h=" << image.height () << endl; + #endif + + sel = kpSelection (kpSelection::Rectangle, + QRect (0, 0, image.width (), image.height ()), + kpPixmapFX::convertToPixmapAsLosslessAsPossible (image, wali)); + } + else + { + #if DEBUG_KP_SELECTION_DRAG + kdDebug () << "kpSelectionDrag::decode(kpSelection) mimeSource had no sel " + "and could not decode to image" << endl; + #endif + return false; + } + } + + return true; +} + +#include <kpselectiondrag.moc> |