Fix jumpy scrolling in Account Settings.

src/CMakeLists.txt

@@ -61,6 +61,7 @@ SET( tomahawkSourcesGui ${tomahawkSourcesGui}
      SocialWidget.cpp
 
      widgets/ContainedMenuButton.cpp
+     widgets/AccountListView.cpp
      widgets/AccountListWidget.cpp
      widgets/AccountModelFactoryProxy.cpp
      widgets/AccountWidget.cpp

src/Settings_Accounts.ui

@@ -55,7 +55,7 @@
     </layout>
    </item>
    <item>
-    <widget class="QListView" name="accountsView">
+    <widget class="AccountListView" name="accountsView">
      <property name="alternatingRowColors">
       <bool>true</bool>
      </property>
@@ -76,6 +76,11 @@
    <header>thirdparty/Qocoa/qbutton.h</header>
    <container>1</container>
   </customwidget>
+  <customwidget>
+   <class>AccountListView</class>
+   <extends>QListView</extends>
+   <header>widgets/AccountListView.h</header>
+  </customwidget>
  </customwidgets>
  <resources/>
  <connections/>

src/libtomahawk/accounts/AccountDelegate.cpp

@@ -39,12 +39,6 @@
 #define PADDING_BETWEEN_STARS 2
 #define STAR_SIZE 12
 
-#ifdef Q_OS_MAC
-#define ROW_HEIGHT_MULTIPLIER 4.9
-#else
-#define ROW_HEIGHT_MULTIPLIER 5.7
-#endif
-
 #define ICONSIZE 40
 #define WRENCH_SIZE 24
 #define SMALL_WRENCH_SIZE 16
@@ -72,7 +66,7 @@ AccountDelegate::sizeHint( const QStyleOptionViewItem& option, const QModelIndex
         // Haven't calculated normal item height yet, do it once and save it
         QStyleOptionViewItemV4 opt( option );
         initStyleOption( &opt, index );
-        m_accountRowHeight = ROW_HEIGHT_MULTIPLIER * opt.fontMetrics.height();
+        m_accountRowHeight = ACCOUNT_DELEGATE_ROW_HEIGHT_MULTIPLIER * opt.fontMetrics.height();
     }
 
     if ( rowType == AccountModel::TopLevelAccount || rowType == AccountModel::UniqueFactory || rowType == AccountModel::CustomAccount )

src/libtomahawk/accounts/AccountDelegate.h

@@ -23,6 +23,14 @@
 #include <QStyledItemDelegate>
 #include "accounts/AccountModel.h"
 
+
+#ifdef Q_OS_MAC
+#define ACCOUNT_DELEGATE_ROW_HEIGHT_MULTIPLIER 4.9
+#else
+#define ACCOUNT_DELEGATE_ROW_HEIGHT_MULTIPLIER 5.7
+#endif
+
+
 class AnimatedSpinner;
 
 namespace Tomahawk

src/widgets/AccountListView.cpp

@@ -0,0 +1,38 @@
+/* === This file is part of Tomahawk Player - <http://tomahawk-player.org> ===
+ *
+ *   Copyright 2013,      Teo Mrnjavac <teo@kde.org>
+ *
+ *   Tomahawk 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 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Tomahawk 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 Tomahawk. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "AccountListView.h"
+#include "accounts/AccountDelegate.h"
+
+#include <QScrollBar>
+
+AccountListView::AccountListView( QWidget* parent )
+    : QListView( parent )
+{}
+
+void
+AccountListView::wheelEvent( QWheelEvent* e )
+{
+    //HACK: Workaround for QTBUG-7232: Smooth scrolling (scroll per pixel) in ItemViews
+    //      does not work as expected.
+#ifdef Q_WS_X11
+    verticalScrollBar()->setSingleStep( ACCOUNT_DELEGATE_ROW_HEIGHT_MULTIPLIER * fontMetrics().height() / 8 );
+                                     // ^ scroll step is 1/8 of the estimated row height
+#endif
+    QListView::wheelEvent( e );
+}

src/widgets/AccountListView.h

@@ -0,0 +1,38 @@
+/* === This file is part of Tomahawk Player - <http://tomahawk-player.org> ===
+ *
+ *   Copyright 2013,      Teo Mrnjavac <teo@kde.org>
+ *
+ *   Tomahawk 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 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Tomahawk 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 Tomahawk. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ACCOUNTLISTVIEW_H
+#define ACCOUNTLISTVIEW_H
+
+#include <QListView>
+
+/**
+ * @brief The AccountListView class does not add functionality, it just implements a
+ * much needed workaround that fixes a scrolling issue with large delegates.
+ */
+class AccountListView : public QListView
+{
+    Q_OBJECT
+public:
+    explicit AccountListView( QWidget* parent = 0 );
+
+protected:
+    void wheelEvent( QWheelEvent* );
+};
+
+#endif // ACCOUNTLISTVIEW_H