X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=blobdiff_plain;f=src%2Fuisupport%2Ftreeviewtouch.cpp;h=31da5ed52569f41101d11c8d22142456645d8263;hp=6b795f51efa84d37aaab87b4c6e371a548037807;hb=cc6e7c08709c4e761e2fd9c2e322751015497003;hpb=eb1db9563e94831770974fcbdb864d855c73017a

diff --git a/src/uisupport/treeviewtouch.cpp b/src/uisupport/treeviewtouch.cpp
index 6b795f51..31da5ed5 100644
--- a/src/uisupport/treeviewtouch.cpp
+++ b/src/uisupport/treeviewtouch.cpp
@@ -1,75 +1,80 @@
 /***************************************************************************
-*   Copyright (C) 2005-2015 by the Quassel Project                        *
-*   devel@quassel-irc.org                                                 *
-*                                                                         *
-*   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) version 3.                                           *
-*                                                                         *
-*   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.         *
-***************************************************************************/
+ *   Copyright (C) 2005-2019 by the Quassel Project                        *
+ *   devel@quassel-irc.org                                                 *
+ *                                                                         *
+ *   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) version 3.                                           *
+ *                                                                         *
+ *   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 "treeviewtouch.h"
 
-#include <QtCore>
-#include <QTouchEvent>
+#include <QEvent>
 #include <QScrollBar>
+#include <QTouchEvent>
 
-TreeViewTouch::TreeViewTouch(QWidget *parent)
-	: QTreeView(parent)
+TreeViewTouch::TreeViewTouch(QWidget* parent)
+    : QTreeView(parent)
 {
-	setAttribute(Qt::WA_AcceptTouchEvents);
+    setAttribute(Qt::WA_AcceptTouchEvents);
 }
 
+bool TreeViewTouch::event(QEvent* event)
+{
+    if (event->type() == QEvent::TouchBegin && ((QTouchEvent*)event)->device()->type() == QTouchDevice::TouchScreen) {
+        // Register that we may be scrolling, set the scroll mode to scroll-per-pixel
+        // and accept the event (return true) so that we will receive TouchUpdate and TouchEnd/TouchCancel
+        _touchScrollInProgress = true;
+        setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
+        return true;
+    }
 
-bool TreeViewTouch::event(QEvent *event) {
-	if (event->type() == QEvent::TouchBegin) {
-		_touchScrollInProgress = true;
-		setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
-		return true;
-	}
-
-	if (event->type() == QEvent::TouchUpdate && _touchScrollInProgress) {
-		QTouchEvent::TouchPoint p = ((QTouchEvent*)event)->touchPoints().at(0);
-		if (!_firstTouchUpdateHappened) {
-			double dx = abs(p.lastPos().x() - p.pos().x());
-			double dy = abs(p.lastPos().y() - p.pos().y());
-			if (dx > dy) {
-				_touchScrollInProgress = false;
-			}
-			_firstTouchUpdateHappened = true;
-		}
-		verticalScrollBar()->setValue(verticalScrollBar()->value() - (p.pos().y() - p.lastPos().y()));
-		return true;
-	}
+    if (event->type() == QEvent::TouchUpdate && _touchScrollInProgress) {
+        QTouchEvent::TouchPoint p = ((QTouchEvent*)event)->touchPoints().at(0);
+        if (!_firstTouchUpdateHappened) {
+            // After the first movement of a Touch-Point, calculate the distance in both axis
+            // and if the point moved more horizontally abort scroll.
+            double dx = qAbs(p.lastPos().x() - p.pos().x());
+            double dy = qAbs(p.lastPos().y() - p.pos().y());
+            if (dx > dy) {
+                _touchScrollInProgress = false;
+            }
+            _firstTouchUpdateHappened = true;
+        }
+        // Apply touch movement to scrollbar
+        verticalScrollBar()->setValue(verticalScrollBar()->value() - (p.pos().y() - p.lastPos().y()));
+        return true;
+    }
 
-#if QT_VERSION >= 0x050000
-	if (event->type() == QEvent::TouchEnd || event->type() == QEvent::TouchCancel) {
-#else
-    if (event->type() == QEvent::TouchEnd) {
-#endif
-		_touchScrollInProgress = false;
-		_firstTouchUpdateHappened = false;
-		return true;
-	}
+    if (event->type() == QEvent::TouchEnd || event->type() == QEvent::TouchCancel) {
+        // End scroll and reset variables
+        _touchScrollInProgress = false;
+        _firstTouchUpdateHappened = false;
+        return true;
+    }
 
-	return QTreeView::event(event);
+    return QTreeView::event(event);
 }
 
-void TreeViewTouch::mousePressEvent(QMouseEvent * event) {
-	if (!_touchScrollInProgress)
-		QTreeView::mousePressEvent(event);
+void TreeViewTouch::mousePressEvent(QMouseEvent* event)
+{
+    if (!_touchScrollInProgress)
+        QTreeView::mousePressEvent(event);
 }
 
-void TreeViewTouch::mouseMoveEvent(QMouseEvent * event) {
-	if (!_touchScrollInProgress)
-		QTreeView::mouseMoveEvent(event);
-};
+void TreeViewTouch::mouseMoveEvent(QMouseEvent* event)
+{
+    if (!_touchScrollInProgress)
+        QTreeView::mouseMoveEvent(event);
+}