1 files changed, 178 insertions, 0 deletions
diff --git a/src/ktreeview.cpp b/src/ktreeview.cpp
new file mode 100644
index 000000000..7448614f9
--- /dev/null
+++ b/src/ktreeview.cpp
@@ -0,0 +1,178 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by <haraldhv (at) stud.ntnu.no>                    *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program 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 General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#include <KGlobalSettings>
+
+#include <QDebug>
+#include <QScrollBar>
+
+#include "ktreeview.h"
+#include "ktreeview_p.h"
+
+KTreeView::KTreeViewPrivate::KTreeViewPrivate(KTreeView *parent)
+	: parent(parent),
+	autoHorizontalScroll(true),
+	scrollTowards(0),
+	scrollPixels(5),
+	scrollDelay(50),
+	leftSideMargin(30),
+	considerDelay(500),
+	topLeftPoint(QPoint(10,10))
+{
+	Q_ASSERT(parent->verticalScrollBar());
+
+	considerDelayTimer.setInterval(considerDelay);
+
+	connect( &considerDelayTimer,
+			SIGNAL(timeout()),
+			this,
+			SLOT(considerAutoScroll())
+		   );
+
+	connect( parent->verticalScrollBar(),
+			SIGNAL(rangeChanged(int, int)),
+			&considerDelayTimer,
+			SLOT(start())
+		   );
+
+	connect( parent->verticalScrollBar(),
+			SIGNAL(valueChanged(int)),
+			&considerDelayTimer,
+			SLOT(start())
+		   );
+
+	connect( parent,
+			SIGNAL( collapsed ( const QModelIndex &)),
+			&considerDelayTimer,
+			SLOT(start())
+		   );
+
+	connect( parent,
+			SIGNAL( expanded ( const QModelIndex &)),
+			&considerDelayTimer,
+			SLOT(start())
+		   );
+
+}
+
+void KTreeView::KTreeViewPrivate::considerAutoScroll()
+{
+	qDebug() << "Considering auto scroll";
+
+	QModelIndex i = parent->indexAt(topLeftPoint);
+	int smallest = parent->width();
+
+	while (i.isValid())
+	{
+		QRect r = parent->visualRect(i);
+		if (r.top() > parent->height())
+			break;
+
+		int leftSide = r.left();
+
+		smallest = qMin(smallest, leftSide);
+		i = parent->indexBelow(i);
+	}
+
+	int currentScroll = parent->horizontalScrollBar()->value();
+
+	setScrollTowards(smallest + currentScroll - leftSideMargin);
+
+	considerDelayTimer.stop();
+
+}
+
+void KTreeView::KTreeViewPrivate::autoScrollTimeout()
+{
+
+	Q_ASSERT(parent);
+
+	QScrollBar *scrollBar = parent->horizontalScrollBar();
+	if (scrollBar == NULL)
+	{
+		qDebug() << "Warning: no scrollbar present, but told to scroll.";
+		scrollTimer.stop();
+		return;
+	}
+
+	int currentScroll = scrollBar->value();
+
+	int difference = currentScroll - scrollTowards;
+
+	if (qAbs(difference) < scrollPixels)
+	{
+		scrollBar->setValue(scrollTowards);
+		scrollTimer.stop();
+		return;
+	}
+
+	if (difference < 0)
+	{
+		scrollBar->setValue(currentScroll + scrollPixels);
+	}
+	else
+	{
+		scrollBar->setValue(currentScroll - scrollPixels);
+	}
+}
+
+void KTreeView::KTreeViewPrivate::setScrollTowards( int scrollTowards )
+{
+	if (scrollTowards < 0)
+		scrollTowards = 0;
+	this->scrollTowards = scrollTowards;
+	scrollTimer.start(scrollDelay);
+}
+
+//************************************************
+
+KTreeView::KTreeView(QWidget *parent)
+	: QTreeView(parent)
+	, d(new KTreeViewPrivate(this))
+{
+	/* The graphicEffectsLevel was not available in the 4.0.3 version of
+	 * the libs I was compiling with, so this is left out for now and
+	 * enabled by default...
+	 */
+	//if (KGlobalSettings::graphicEffectsLevel() >=
+			//KGlobalSettings::SimpleAnimationEffects)
+	//{
+		setAutoHorizontalScroll(true);
+	//}
+		connect(
+				&d->scrollTimer,
+				SIGNAL(timeout()),
+				d,
+				SLOT(autoScrollTimeout())
+			   );
+
+}
+
+void KTreeView::setAutoHorizontalScroll(bool value)
+{
+	d->autoHorizontalScroll = value;
+}
+
+bool KTreeView::autoHorizontalScroll( void )
+{
+	return d->autoHorizontalScroll;
+}
+
+#include "ktreeview.moc"
+#include "ktreeview_p.moc"