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tdevelop/kdevdesigner/designer/listviewdnd.cpp

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/**********************************************************************
** Copyright (C) 2002 Trolltech AS. All rights reserved.
**
** This file is part of Qt Designer.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#include "listviewdnd.h"
#include <qwidget.h>
#include <qheader.h>
#include <qpainter.h>
#include <qdragobject.h>
#include <qvaluelist.h>
// The Dragobject Declaration ---------------------------------------
class ListViewItemDrag : public QStoredDrag
{
public:
enum DropRelation { Sibling, Child };
ListViewItemDrag( ListViewItemList & items, QWidget * parent = 0, const char * name = 0 );
~ListViewItemDrag() {};
static bool canDecode( QDragMoveEvent * event );
static bool decode( QDropEvent * event, QListView * parent, QListViewItem * insertPoint, DropRelation dr );
};
// ------------------------------------------------------------------
ListViewDnd::ListViewDnd( QListView * eventSource, const char * name )
: ListDnd( eventSource, name ) { }
void ListViewDnd::confirmDrop( QListViewItem * )
{
dropConfirmed = TRUE;
}
bool ListViewDnd::dropEvent( QDropEvent * event )
{
if ( dragInside ) {
if ( dMode & NullDrop ) { // combined with Move, a NullDrop will delete an item
event->accept();
emit dropped( 0 ); // a NullDrop
return TRUE;
}
QPoint pos = event->pos();
ListViewItemDrag::DropRelation dr = ListViewItemDrag::Sibling;
QListViewItem *item = itemAt( pos );
int dpos = dropDepth( item, pos );
if ( item ) {
if ( dpos > item->depth() && !(dMode & Flat) ) {
// Child node
dr = ListViewItemDrag::Child;
} else if ( dpos < item->depth() ) {
// Parent(s) Sibling
while ( item && (item->depth() > dpos) )
item = item->parent();
}
}
if ( ListViewItemDrag::decode( event, (QListView *) src, item, dr ) ) {
event->accept();
emit dropped( 0 ); // Use ID instead of item?
}
}
line->hide();
dragInside = FALSE;
return TRUE;
}
bool ListViewDnd::mouseMoveEvent( QMouseEvent * event )
{
if ( event->state() & LeftButton ) {
if ( ( event->pos() - mousePressPos ).manhattanLength() > 3 ) {
ListViewItemList list;
if ( dMode & Flat )
buildFlatList( list );
else
buildTreeList( list );
ListViewItemDrag * dragobject = new ListViewItemDrag( list, (QListView *) src );
if ( dMode & Move ) {
disabledItems = list;
setVisibleItems( FALSE );
}
dragobject->dragCopy();
if ( dMode & Move ) {
// Did the target accept the drop?
if ( dropConfirmed ) {
// Shouldn't autoDelete handle this?
for( list.first(); list.current(); list.next() )
delete list.current();
dropConfirmed = FALSE;
} else {
// Reenable disabled items since
// drag'n'drop was aborted
setVisibleItems( TRUE );
}
disabledItems.clear();
}
}
}
return FALSE;
}
int ListViewDnd::buildFlatList( ListViewItemList & list )
{
bool addKids = FALSE;
QListViewItem *nextSibling = 0;
QListViewItem *nextParent = 0;
QListViewItemIterator it = ((QListView *)src)->firstChild();
for ( ; *it; it++ ) {
// Hit the nextSibling, turn of child processing
if ( (*it) == nextSibling )
addKids = FALSE;
if ( (*it)->isSelected() ) {
if ( (*it)->childCount() == 0 ) {
// Selected, no children
list.append( *it );
} else if ( !addKids ) {
// Children processing not set, so set it
// Also find the item were we shall quit
// processing children...if any such item
addKids = TRUE;
nextSibling = (*it)->nextSibling();
nextParent = (*it)->parent();
while ( nextParent && !nextSibling ) {
nextSibling = nextParent->nextSibling();
nextParent = nextParent->parent();
}
}
} else if ( ((*it)->childCount() == 0) && addKids ) {
// Leaf node, and we _do_ process children
list.append( *it );
}
}
return list.count();
}
int ListViewDnd::buildTreeList( ListViewItemList & list )
{
QListViewItemIterator it = ((QListView *)src)->firstChild();
for ( ; *it; it++ ) {
if ( (*it)->isSelected() )
list.append( *it );
}
return list.count();
}
void ListViewDnd::setVisibleItems( bool b )
{
if ( disabledItems.isEmpty() )
return;
disabledItems.first();
do {
disabledItems.current()->setVisible( b );
} while ( disabledItems.next() );
}
void ListViewDnd::updateLine( const QPoint & dragPos )
{
QListViewItem * item = itemAt(dragPos);
QListView * src = (QListView *) this->src;
int ypos = item ?
( src->itemRect( item ).bottom() - ( line->height() / 2 ) ) :
( src->itemRect( src->firstChild() ).top() );
int xpos = dropDepth( item, dragPos ) * src->treeStepSize();
line->resize( src->viewport()->width() - xpos, line->height() );
line->move( xpos, ypos );
}
QListViewItem * ListViewDnd::itemAt( QPoint pos )
{
QListView * src = (QListView *) this->src;
int headerHeight = (int)(src->header()->height());
pos.ry() -= headerHeight;
QListViewItem * result = src->itemAt( pos );
if ( result && ( pos.ry() < (src->itemPos(result) + result->height()/2) ) )
result = result->itemAbove();
// Wind back if has parent, and we're in flat mode
while ( result && result->parent() && (dMode & Flat) )
result = result->parent();
// Wind back if has parent, and we're in flat mode
while ( result && !result->isVisible() && result->parent() )
result = result->parent();
if ( !result && src->firstChild() && (pos.y() > src->itemRect(src->firstChild()).bottom()) ) {
result = src->lastItem();
if ( !result->isVisible() )
// Handle special case where last item is actually hidden
result = result->itemAbove();
}
return result;
}
int ListViewDnd::dropDepth( QListViewItem * item, QPoint pos )
{
if ( !item || (dMode & Flat) )
return 0;
int result = 0;
int itemDepth = item->depth();
int indentSize = ((QListView *)src)->treeStepSize();
int itemLeft = indentSize * itemDepth;
int childMargin = indentSize*2;
if ( pos.x() > itemLeft + childMargin ) {
result = itemDepth + 1;
} else if ( pos.x() < itemLeft ) {
result = pos.x() / indentSize;
} else {
result = itemDepth;
}
return result;
}
bool ListViewDnd::canDecode( QDragEnterEvent * event )
{
return ListViewItemDrag::canDecode( event );
}
// ------------------------------------------------------------------
// The Dragobject Implementation ------------------------------------
// ------------------------------------------------------------------
QDataStream & operator<< ( QDataStream & stream, const QListViewItem & item );
QDataStream & operator>> ( QDataStream & stream, QListViewItem & item );
ListViewItemDrag::ListViewItemDrag( ListViewItemList & items, QWidget * parent, const char * name )
: QStoredDrag( "qt/listviewitem", parent, name )
{
// ### FIX!
QByteArray data( sizeof( Q_INT32 ) + sizeof( QListViewItem ) * items.count() );
QDataStream stream( data, IO_WriteOnly );
stream << items.count();
QListViewItem *i = items.first();
while ( i ) {
stream << *i;
i = items.next();
}
setEncodedData( data );
}
bool ListViewItemDrag::canDecode( QDragMoveEvent * event )
{
return event->provides( "qt/listviewitem" );
}
bool ListViewItemDrag::decode( QDropEvent * event, QListView * parent, QListViewItem * insertPoint, DropRelation dr )
{
QByteArray data = event->encodedData( "qt/listviewitem" );
QListViewItem* itemParent = insertPoint ? insertPoint->parent() : 0;
// Change from sibling (default) to child creation
if ( insertPoint && dr == Child ) {
itemParent = insertPoint;
insertPoint = 0;
}
if ( data.size() ) {
event->accept();
QDataStream stream( data, IO_ReadOnly );
int count = 0;
stream >> count;
for( int i = 0; i < count; i++ ) {
if ( itemParent ) {
insertPoint = new QListViewItem( itemParent, insertPoint );
itemParent->setOpen( TRUE );
} else { // No parent for insertPoint, use QListView
insertPoint = new QListViewItem( parent, insertPoint );
}
stream >> *insertPoint;
}
return TRUE;
}
return FALSE;
}
QDataStream & operator<< ( QDataStream & stream, const QListViewItem & item )
{
int columns = item.listView()->columns();
stream << columns;
Q_UINT8 b = 0;
int i;
for ( i = 0; i < columns; i++ ) {
b = (Q_UINT8) ( item.text( i ) != QString::null ); // does column i have a string ?
stream << b;
if ( b ) {
stream << item.text( i );
}
}
for ( i = 0; i < columns; i++ ) {
b = (Q_UINT8) ( !!item.pixmap( i ) ); // does column i have a pixmap ?
stream << b;
if ( b ) {
stream << ( *item.pixmap( i ) );
}
}
stream << (Q_UINT8) item.isOpen();
stream << (Q_UINT8) item.isSelectable();
stream << (Q_UINT8) item.isExpandable();
stream << (Q_UINT8) item.dragEnabled();
stream << (Q_UINT8) item.dropEnabled();
stream << (Q_UINT8) item.isVisible();
for ( i = 0; i < columns; i++ ) {
stream << (Q_UINT8) item.renameEnabled( i );
}
stream << (Q_UINT8) item.multiLinesEnabled();
stream << item.childCount();
if ( item.childCount() > 0 ) {
QListViewItem * child = item.firstChild();
while ( child ) {
stream << ( *child ); // recursive call
child = child->nextSibling();
}
}
return stream;
}
QDataStream & operator>> ( QDataStream & stream, QListViewItem & item )
{
Q_INT32 columns;
stream >> columns;
Q_UINT8 b = 0;
QString text;
int i;
for ( i = 0; i < columns; i++ ) {
stream >> b;
if ( b ) { // column i has string ?
stream >> text;
item.setText( i, text );
}
}
QPixmap pixmap;
for ( i = 0; i < columns; i++ ) {
stream >> b; // column i has pixmap ?
if ( b ) {
stream >> pixmap;
item.setPixmap( i, pixmap );
}
}
stream >> b;
item.setOpen( b );
stream >> b;
item.setSelectable( b );
stream >> b;
item.setExpandable( b );
stream >> b;
item.setDragEnabled( b );
stream >> b;
item.setDropEnabled( b );
stream >> b;
item.setVisible( b );
for ( i = 0; i < columns; i++ ) {
stream >> b;
item.setRenameEnabled( i, b );
}
stream >> b;
item.setMultiLinesEnabled( b );
int childCount;
stream >> childCount;
QListViewItem *child = 0;
QListViewItem *prevchild = 0;
for ( i = 0; i < childCount; i++ ) {
child = new QListViewItem( &item, prevchild );
stream >> ( *child );
item.insertItem( child );
prevchild = child;
}
return stream;
}