Mouse TDECM: add option to swap history navigation buttons

This leverages the existing code that interacts with X11 and sets the setting system-wide, as happens already with scroll direction reversal.

This resolves issue #497.

Signed-off-by: Mavridis Philippe <mavridisf@gmail.com>

kcontrol/input/kmousedlg.ui

@@ -1,4 +1,4 @@
-<!DOCTYPE UI><UI version="3.2" stdsetdef="1">
+<!DOCTYPE UI><UI version="3.3" stdsetdef="1">
 <class>KMouseDlg</class>
 <widget class="TQWidget">
     <property name="name">
@@ -12,6 +12,9 @@
             <height>434</height>
         </rect>
     </property>
+    <property name="caption">
+        <string>KMouseDlg</string>
+    </property>
     <vbox>
         <property name="name">
             <cstring>unnamed</cstring>
@@ -135,6 +138,17 @@
                 <string>Change the direction of scrolling for the mouse wheel or the 4th and 5th mouse buttons.</string>
             </property>
         </widget>
+        <widget class="TQCheckBox">
+            <property name="name">
+                <cstring>cbRevHistButtons</cstring>
+            </property>
+            <property name="text">
+                <string>Swap &amp;history navigation buttons</string>
+            </property>
+            <property name="whatsThis" stdset="0">
+                <string>Swap the two history navigation buttons on the mouse (8th and 9th mouse button).</string>
+            </property>
+        </widget>
         <widget class="TQGroupBox">
             <property name="name">
                 <cstring>GroupBox1</cstring>

kcontrol/input/mouse.cpp

@@ -162,7 +162,8 @@ MouseConfig::MouseConfig (TQWidget * parent, const char *name)
 
     // Only allow setting reversing scroll polarity if we have scroll buttons
     unsigned char map[20];
-    if ( XGetPointerMapping(kapp->getDisplay(), map, 20) >= 5 )
+    int buttonCount = XGetPointerMapping(kapp->getDisplay(), map, 20);
+    if ( buttonCount >= 5 )
     {
       tab1->cbScrollPolarity->setEnabled( true );
       tab1->cbScrollPolarity->show();
@@ -175,6 +176,20 @@ MouseConfig::MouseConfig (TQWidget * parent, const char *name)
     connect(tab1->cbScrollPolarity, TQ_SIGNAL(clicked()), this, TQ_SLOT(changed()));
     connect(tab1->cbScrollPolarity, TQ_SIGNAL(clicked()), this, TQ_SLOT(slotScrollPolarityChanged()));
 
+    // Only allow setting reversing history buttons (8, 9) if we have actually have them
+    if ( buttonCount >= 9 )
+    {
+      tab1->cbRevHistButtons->setEnabled( true );
+      tab1->cbRevHistButtons->show();
+    }
+    else
+    {
+      tab1->cbRevHistButtons->setEnabled( false );
+      tab1->cbRevHistButtons->hide();
+    }
+    connect(tab1->cbRevHistButtons, TQ_SIGNAL(clicked()), this, TQ_SLOT(changed()));
+    connect(tab1->cbRevHistButtons, TQ_SIGNAL(clicked()), this, TQ_SLOT(slotRevHistButtonsChanged()));
+
     // Cursor theme tab
     themetab = new ThemePage(this);
     connect(themetab, TQ_SIGNAL(changed(bool)), TQ_SLOT(changed()));
@@ -436,7 +451,7 @@ MouseConfig::MouseConfig (TQWidget * parent, const char *name)
   load();
 
   TDEAboutData* about = new TDEAboutData("kcmmouse", I18N_NOOP("Mouse"), 0, 0,
-        TDEAboutData::License_GPL, I18N_NOOP("(c) 1997 - 2005 Mouse developers")); 
+        TDEAboutData::License_GPL, I18N_NOOP("(c) 1997 - 2005 Mouse developers"));
   about->addAuthor("Patrick Dowler", 0, 0);
   about->addAuthor("Dirk A. Mueller", 0, 0);
   about->addAuthor("David Faure", 0, 0);
@@ -522,9 +537,12 @@ void MouseConfig::load( bool useDefaults )
 
   tab1->rightHanded->setEnabled(settings->handedEnabled);
   tab1->leftHanded->setEnabled(settings->handedEnabled);
-  if ( tab1->cbScrollPolarity->isEnabled() )
-    tab1->cbScrollPolarity->setEnabled(settings->handedEnabled);
+  if (tab1->cbScrollPolarity->isEnabled())
+      tab1->cbScrollPolarity->setEnabled(settings->handedEnabled);
+  if (tab1->cbRevHistButtons->isEnabled())
+      tab1->cbRevHistButtons->setEnabled(settings->handedEnabled);
   tab1->cbScrollPolarity->setChecked( settings->reverseScrollPolarity );
+  tab1->cbRevHistButtons->setChecked( settings->reverseHistoryButtons );
 
   setAccel(settings->accelRate);
   setThreshold(settings->thresholdMove);
@@ -597,6 +615,7 @@ void MouseConfig::save()
 //  settings->changeCursor = tab1->singleClick->isChecked();
   settings->changeCursor = tab1->cb_pointershape->isChecked();
   settings->reverseScrollPolarity = tab1->cbScrollPolarity->isChecked();
+  settings->reverseHistoryButtons = tab1->cbRevHistButtons->isChecked();
 
   settings->apply();
   TDEConfig config( "kcminputrc" );
@@ -746,6 +765,7 @@ void MouseSettings::load(TDEConfig *config)
   else if (key == NULL)
     handed = h;
   reverseScrollPolarity = config->readBoolEntry( "ReverseScrollPolarity", false );
+  reverseHistoryButtons = config->readBoolEntry( "ReverseHistoryButtons", false );
   m_handedNeedsApply = false;
 
   // SC/DC/AutoSelect/ChangeCursor
@@ -781,7 +801,7 @@ void MouseSettings::apply(bool force)
   XChangePointerControl( kapp->getDisplay(),
                          true, true, int(tqRound(accelRate*10)), 10, thresholdMove);
 
-  // 256 might seems extreme, but X has already been known to return 32, 
+  // 256 might seems extreme, but X has already been known to return 32,
   // and we don't want to truncate things. Xlib limits the table to 256 bytes,
   // so it's a good uper bound..
   unsigned char map[256];
@@ -836,6 +856,21 @@ void MouseSettings::apply(bool force)
                   map[pos+1] = reverseScrollPolarity ? (unsigned char) 4 : (unsigned char) 5;
               }
           }
+          // 8,9 => history navigation buttons
+          // Logic is same as above with buttons 4 and 5, we find the buttons
+          // in the mapping, then, if needed, reverse them.
+          if (num_buttons >= 9)
+          {
+              int pos;
+              for( pos = 0; pos < num_buttons; ++pos )
+                  if( map[pos] == 8 || map[pos] == 9 )
+                      break;
+              if( pos < num_buttons - 1 )
+              {
+                  map[pos] = reverseHistoryButtons ? (unsigned char) 9 : (unsigned char) 8;
+                  map[pos+1] = reverseHistoryButtons ? (unsigned char) 8 : (unsigned char) 9;
+              }
+          }
       }
       int retval;
       if (remap)
@@ -865,6 +900,7 @@ void MouseSettings::save(TDEConfig *config)
   else
       config->writeEntry("MouseButtonMapping",TQString("LeftHanded"));
   config->writeEntry( "ReverseScrollPolarity", reverseScrollPolarity );
+  config->writeEntry( "ReverseHistoryButtons", reverseHistoryButtons );
 
   config->setGroup("KDE");
   config->writeEntry("DoubleClickInterval", doubleClickInterval, true, true);
@@ -891,6 +927,11 @@ void MouseConfig::slotScrollPolarityChanged()
   settings->m_handedNeedsApply = true;
 }
 
+void MouseConfig::slotRevHistButtonsChanged()
+{
+    settings->m_handedNeedsApply = true;
+}
+
 TQString MouseConfig::handbookSection() const
 {
   int index = tabwidget->currentPageIndex();

kcontrol/input/mouse.h

@@ -83,6 +83,7 @@ public:
  bool changeCursor;
  int wheelScrollLines;
  bool reverseScrollPolarity;
+ bool reverseHistoryButtons;
 
  #ifdef HAVE_LIBUSB
  TQPtrList <LogitechMouse> logitechMouseList;
@@ -111,6 +112,7 @@ private slots:
   /** No descriptions */
   void slotHandedChanged(int val);
   void slotScrollPolarityChanged();
+  void slotRevHistButtonsChanged();
   void checkAccess();
   void slotThreshChanged(int value);
   void slotDragStartDistChanged(int value);