X-Git-Url: https://cloud.milkyroute.net/gitweb/dolphin.git/blobdiff_plain/d339cb83fe35e9d02e37085acb2465b23a305d03..abb6807645598e8117e98bbf232cd9cd90fe019a:/src/dolphinviewautoscroller.cpp

diff --git a/src/dolphinviewautoscroller.cpp b/src/dolphinviewautoscroller.cpp
index c5d5e47d7..cfd3543a5 100644
--- a/src/dolphinviewautoscroller.cpp
+++ b/src/dolphinviewautoscroller.cpp
@@ -26,10 +26,12 @@
 #include <QMouseEvent>
 #include <QScrollBar>
 #include <QTimer>
+#include <math.h>
 
 DolphinViewAutoScroller::DolphinViewAutoScroller(QAbstractItemView* parent) :
     QObject(parent),
     m_rubberBandSelection(false),
+    m_keyPressed(false),
     m_horizontalScrollInc(0),
     m_verticalScrollInc(0),
     m_itemView(parent),
@@ -37,6 +39,7 @@ DolphinViewAutoScroller::DolphinViewAutoScroller(QAbstractItemView* parent) :
 {
     m_itemView->setAutoScroll(false);
     m_itemView->viewport()->installEventFilter(this);
+    m_itemView->installEventFilter(this);
 
     m_timer = new QTimer(this);
     m_timer->setSingleShot(false);
@@ -53,6 +56,18 @@ bool DolphinViewAutoScroller::isActive() const
     return m_timer->isActive();
 }
 
+void DolphinViewAutoScroller::handleCurrentIndexChange(const QModelIndex& current,
+                                                       const QModelIndex& previous)
+{
+    // When the autoscroller is inactive and a key has been pressed, it must be
+    // assured that the current item stays visible. The check whether the previous
+    // item is valid is important because of #197951. The keypress check is done
+    // because of #199833.
+    if (current.isValid() && (previous.isValid() || m_keyPressed) && !isActive()) {
+        m_itemView->scrollTo(current);
+    }
+}
+
 bool DolphinViewAutoScroller::eventFilter(QObject* watched, QEvent* event)
 {
     if (watched == m_itemView->viewport()) {
@@ -86,6 +101,19 @@ bool DolphinViewAutoScroller::eventFilter(QObject* watched, QEvent* event)
             stopAutoScroll();
             break;
 
+        default:
+            break;
+        }
+    } else if (watched == m_itemView) {
+        switch (event->type()) {
+        case QEvent::KeyPress:
+            m_keyPressed = true;
+            break;
+
+        case QEvent::KeyRelease:
+            m_keyPressed = false;
+            break;
+
         default:
             break;
         }
@@ -161,17 +189,17 @@ int DolphinViewAutoScroller::calculateScrollIncrement(int cursorPos, int rangeSi
     int inc = 0;
 
     const int minSpeed = 4;
-    const int maxSpeed = 64;
-    const int speedLimiter = 4;
-    const int autoScrollBorder = 32;
+    const int maxSpeed = 768;
+    const int speedLimiter = 48;
+    const int autoScrollBorder = 64;
 
     if (cursorPos < autoScrollBorder) {
-        inc = -minSpeed + (cursorPos - autoScrollBorder) / speedLimiter;
+        inc = -minSpeed + qAbs(cursorPos - autoScrollBorder) * (cursorPos - autoScrollBorder) / speedLimiter;
         if (inc < -maxSpeed) {
             inc = -maxSpeed;
         }
     } else if (cursorPos > rangeSize - autoScrollBorder) {
-        inc = minSpeed + (cursorPos - rangeSize + autoScrollBorder) / speedLimiter;
+        inc = minSpeed + qAbs(cursorPos - rangeSize + autoScrollBorder) * (cursorPos - rangeSize + autoScrollBorder) / speedLimiter;
         if (inc > maxSpeed) {
             inc = maxSpeed;
         }