1 files changed, 133 insertions, 0 deletions
diff --git a/examples/customlayout/flow.cpp b/examples/customlayout/flow.cpp
new file mode 100644
index 000000000..af1fdf5fe
--- /dev/null
+++ b/examples/customlayout/flow.cpp
@@ -0,0 +1,133 @@
+/****************************************************************************
+**
+** Implementing your own layout: flow example
+**
+** Copyright (C) 1996-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for TQt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include "flow.h"
+
+class SimpleFlowIterator :public TQGLayoutIterator
+{
+public:
+    SimpleFlowIterator( TQPtrList<TQLayoutItem> *l ) :idx(0), list(l)  {}
+    uint count() const;
+    TQLayoutItem *current();
+    TQLayoutItem *next();
+    TQLayoutItem *takeCurrent();
+
+private:
+    int idx;
+    TQPtrList<TQLayoutItem> *list;
+
+};
+
+uint SimpleFlowIterator::count() const
+{
+    return list->count();
+}
+
+TQLayoutItem *SimpleFlowIterator::current()
+{
+    return idx < int(count()) ? list->at(idx) : 0;
+}
+
+TQLayoutItem *SimpleFlowIterator::next()
+{
+    idx++; return current();
+}
+
+TQLayoutItem *SimpleFlowIterator::takeCurrent()
+{
+    return idx < int(count()) ? list->take( idx ) : 0;
+}
+
+SimpleFlow::~SimpleFlow()
+{
+    deleteAllItems();
+}
+
+
+int SimpleFlow::heightForWidth( int w ) const
+{
+    if ( cached_width != w ) {
+	//Not all C++ compilers support "mutable" yet:
+	SimpleFlow * mthis = (SimpleFlow*)this;
+	int h = mthis->doLayout( TQRect(0,0,w,0), TRUE );
+	mthis->cached_hfw = h;
+	mthis->cached_width = w;
+	return h;
+    }
+    return cached_hfw;
+}
+
+void SimpleFlow::addItem( TQLayoutItem *item)
+{
+    list.append( item );
+}
+
+bool SimpleFlow::hasHeightForWidth() const
+{
+    return TRUE;
+}
+
+TQSize SimpleFlow::sizeHint() const
+{
+    return minimumSize();
+}
+
+TQSizePolicy::ExpandData SimpleFlow::expanding() const
+{
+    return TQSizePolicy::NoDirection;
+}
+
+TQLayoutIterator SimpleFlow::iterator()
+{
+    return TQLayoutIterator( new SimpleFlowIterator( &list ) );
+}
+
+void SimpleFlow::setGeometry( const TQRect &r )
+{
+    TQLayout::setGeometry( r );
+    doLayout( r );
+}
+
+int SimpleFlow::doLayout( const TQRect &r, bool testonly )
+{
+    int x = r.x();
+    int y = r.y();
+    int h = 0;		//height of this line so far.
+    TQPtrListIterator<TQLayoutItem> it(list);
+    TQLayoutItem *o;
+    while ( (o=it.current()) != 0 ) {
+	++it;
+	int nextX = x + o->sizeHint().width() + spacing();
+	if ( nextX - spacing() > r.right() && h > 0 ) {
+	    x = r.x();
+	    y = y + h + spacing();
+	    nextX = x + o->sizeHint().width() + spacing();
+	    h = 0;
+	}
+	if ( !testonly )
+	    o->setGeometry( TQRect( TQPoint( x, y ), o->sizeHint() ) );
+	x = nextX;
+	h = TQMAX( h,  o->sizeHint().height() );
+    }
+    return y + h - r.y();
+}
+
+TQSize SimpleFlow::minimumSize() const
+{
+    TQSize s(0,0);
+    TQPtrListIterator<TQLayoutItem> it(list);
+    TQLayoutItem *o;
+    while ( (o=it.current()) != 0 ) {
+	++it;
+	s = s.expandedTo( o->minimumSize() );
+    }
+    return s;
+}