TWin: Active borders and snap tiling

This commit is a squash of the commits of TDE/tdebase#331.

In short, this backports some improvements to existing electric border
functionality from KDE, adds the snap tiling (or aerosnap) feature and
brings rudimentary support for active corners, which will be fully
implemented in a later PR.

The options dialog and the documentation has been updated to reflect
these changes.

Additionally, a new relevant option is introduced: an option for
restoring the original size of maximized/tiled windows when the user
starts dragging them. The option is set to be off by default,
preserving the traditional behaviour of KDE 3.x/TDE.

Last but not least, the term "electric" in relation to borders and
corners is replaced by "active" for clarity to the users.

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

1 files changed, 340 insertions, 237 deletions

diff --git a/twin/workspace.cpp b/twin/workspace.cpp
index 8cddbb72e..03a2e4e50 100644
--- a/twin/workspace.cpp
+++ b/twin/workspace.cpp
@@ -167,12 +167,7 @@ Workspace::Workspace( bool restore )
     global_shortcuts_disabled_for_client( false ),
     root              (0),
     workspaceInit     (true),
-    startup(0), electric_have_borders(false),
-    electric_current_border(0),
-    electric_top_border(None),
-    electric_bottom_border(None),
-    electric_left_border(None),
-    electric_right_border(None),
+    startup(0),
     layoutOrientation(Qt::Vertical),
     layoutX(-1),
     layoutY(2),
@@ -194,6 +189,12 @@ Workspace::Workspace( bool restore )
     installed_colormap = default_colormap;
     session.setAutoDelete( TRUE );
 
+    for (int i = 0; i < ACTIVE_BORDER_COUNT; ++i)
+    {
+        active_reserved[i] = 0;
+        active_windows[i] = None;
+    }
+
     connect( &temporaryRulesMessages, TQT_SIGNAL( gotMessage( const TQString& )),
         this, TQT_SLOT( gotTemporaryRulesMessage( const TQString& )));
     connect( &rulesUpdatedTimer, TQT_SIGNAL( timeout()), this, TQT_SLOT( writeWindowRules()));
@@ -202,8 +203,8 @@ Workspace::Workspace( bool restore )
 
     delayFocusTimer = 0; 
     
-    electric_time_first = GET_QT_X_TIME();
-    electric_time_last = GET_QT_X_TIME();
+    active_time_first = GET_QT_X_TIME();
+    active_time_last = GET_QT_X_TIME();
 
     if ( restore )
       loadSessionInfo();
@@ -304,8 +305,12 @@ Workspace::Workspace( bool restore )
 
 
 void Workspace::init()
+{
+    if (options->activeBorders() == Options::ActiveSwitchAlways)
     {
-    checkElectricBorders();
+        reserveActiveBorderSwitching(true);
+    }
+    updateActiveBorders();
 
 // not used yet
 //     topDock = 0L;
@@ -483,7 +488,6 @@ void Workspace::init()
         updateStackingOrder( true );
 
         updateClientArea();
-        raiseElectricBorders();
 
     // NETWM spec says we have to set it to (0,0) if we don't support it
         NETPoint* viewports = new NETPoint[ number_of_desktops ];
@@ -514,12 +518,27 @@ void Workspace::init()
         }
     if( new_active_client != NULL )
         activateClient( new_active_client );
+
+    // outline windows for active border maximize window mode
+    outline_left = XCreateWindow(tqt_xdisplay(), rootWin(), 0, 0, 1, 1, 0,
+                                 CopyFromParent, CopyFromParent, CopyFromParent,
+                                 CWOverrideRedirect, &attr);
+    outline_right = XCreateWindow(tqt_xdisplay(), rootWin(), 0, 0, 1, 1, 0,
+                                  CopyFromParent, CopyFromParent, CopyFromParent,
+                                  CWOverrideRedirect, &attr);
+    outline_top = XCreateWindow(tqt_xdisplay(), rootWin(), 0, 0, 1, 1, 0,
+                                CopyFromParent, CopyFromParent, CopyFromParent,
+                                CWOverrideRedirect, &attr);
+    outline_bottom = XCreateWindow(tqt_xdisplay(), rootWin(), 0, 0, 1, 1, 0,
+                                   CopyFromParent, CopyFromParent, CopyFromParent,
+                                   CWOverrideRedirect, &attr);
+
     // SELI TODO this won't work with unreasonable focus policies,
     // and maybe in rare cases also if the selected client doesn't
     // want focus
     workspaceInit = false;
 // TODO ungrabXServer()
-    }
+}
 
 Workspace::~Workspace()
     {
@@ -550,6 +569,12 @@ Workspace::~Workspace()
     writeWindowRules();
     TDEGlobal::config()->sync();
 
+    // destroy outline windows for active border maximize window mode
+    XDestroyWindow(tqt_xdisplay(), outline_left);
+    XDestroyWindow(tqt_xdisplay(), outline_right);
+    XDestroyWindow(tqt_xdisplay(), outline_top);
+    XDestroyWindow(tqt_xdisplay(), outline_bottom);
+
     delete rootInfo;
     delete supportWindow;
     delete mgr;
@@ -1038,6 +1063,11 @@ void Workspace::slotReconfigure()
     kdDebug(1212) << "Workspace::slotReconfigure()" << endl;
     reconfigureTimer.stop();
 
+    if (options->activeBorders() == Options::ActiveSwitchAlways)
+    {
+        reserveActiveBorderSwitching(false);
+    }
+
     TDEGlobal::config()->reparseConfiguration();
     unsigned long changed = options->updateSettings();
     tab_box->reconfigure();
@@ -1068,7 +1098,10 @@ void Workspace::slotReconfigure()
         forEachClient( CheckBorderSizesProcedure());
         }
 
-    checkElectricBorders();
+    if (options->activeBorders() == Options::ActiveSwitchAlways)
+    {
+        reserveActiveBorderSwitching(true);
+    }
 
     if( options->topMenuEnabled() && !managingTopMenus())
         {
@@ -2357,7 +2390,7 @@ void Workspace::delayFocus()
     requestFocus( delayfocus_client );
     cancelDelayFocus();
     }
-    
+
 void Workspace::requestDelayFocus( Client* c )
     {
     delayfocus_client = c;
@@ -2366,283 +2399,353 @@ void Workspace::requestDelayFocus( Client* c )
     connect( delayFocusTimer, TQT_SIGNAL( timeout() ), this, TQT_SLOT( delayFocus() ) );
     delayFocusTimer->start( options->delayFocusInterval, TRUE  );
     }
-    
+
 void Workspace::cancelDelayFocus()
     {
     delete delayFocusTimer;
     delayFocusTimer = 0;
     }
 
-// Electric Borders
-//========================================================================//
-// Electric Border Window management. Electric borders allow a user
-// to change the virtual desktop by moving the mouse pointer to the
-// borders. Technically this is done with input only windows. Since
-// electric borders can be switched on and off, we have these two
-// functions to create and destroy them.
-void Workspace::checkElectricBorders( bool force )
+/* Active (Electric) Borders
+ * ========================================================================
+ * Active Border Window management. Active borders allow a user to switch
+ * to another virtual desktop or activate other features by moving
+ * the mouse pointer to the borders or corners of the workspace.
+ * Technically this is done with input only windows.
+ */
+void Workspace::updateActiveBorders()
     {
-    if( force )
-        destroyBorderWindows();
-    
-    electric_current_border = 0;
-
+    active_time_first = GET_QT_X_TIME();
+    active_time_last = GET_QT_X_TIME();
+    active_time_last_trigger = GET_QT_X_TIME();
+    active_current_border = ActiveNone;
     TQRect r = TQApplication::desktop()->geometry();
-    electricTop = r.top();
-    electricBottom = r.bottom();
-    electricLeft = r.left();
-    electricRight = r.right();
+    activeTop = r.top();
+    activeBottom = r.bottom();
+    activeLeft = r.left();
+    activeRight = r.right();
 
-    if (options->electricBorders() == Options::ElectricAlways)
-       createBorderWindows();
-    else
-       destroyBorderWindows();
+    for (int pos = 0; pos < ACTIVE_BORDER_COUNT; ++pos)
+    {
+        if (active_reserved[pos] == 0)
+        {
+            if (active_windows[pos] != None)
+            {
+                XDestroyWindow( tqt_xdisplay(), active_windows[pos] );
+            }
+            active_windows[pos] = None;
+            continue;
+        }
+
+        if (active_windows[pos] != None)
+        {
+            continue;
+        }
+
+        XSetWindowAttributes attributes;
+        attributes.override_redirect = True;
+        attributes.event_mask = EnterWindowMask;
+        unsigned long valuemask = CWOverrideRedirect | CWEventMask;
+        int xywh[ ACTIVE_BORDER_COUNT ][ 4 ] =
+            {
+                { r.left() + 1, r.top(), r.width() - 2, 1 }, // top
+                { r.right(), r.top(), 1, 1 }, // topright
+                { r.right(), r.top() + 1, 1, r.height() - 2 }, // etc.
+                { r.right(), r.bottom(), 1, 1 },
+                { r.left() + 1, r.bottom(), r.width() - 2, 1 },
+                { r.left(), r.bottom(), 1, 1 },
+                { r.left(), r.top() + 1, 1, r.height() - 2 },
+                { r.left(), r.top(), 1, 1 }
+            };
+        active_windows[pos] = XCreateWindow(tqt_xdisplay(), tqt_xrootwin(),
+                                              xywh[pos][0], xywh[pos][1],
+                                              xywh[pos][2], xywh[pos][3],
+                                              0, CopyFromParent, InputOnly,
+                                              CopyFromParent, valuemask,
+                                              &attributes);
+        XMapWindow(tqt_xdisplay(), active_windows[pos]);
+
+        // Set XdndAware on the windows, so that DND enter events are received (#86998)
+        Atom version = 4; // XDND version
+        XChangeProperty(tqt_xdisplay(), active_windows[pos],
+                        atoms->xdnd_aware, XA_ATOM, 32, PropModeReplace,
+                        (unsigned char*)&version, 1);
     }
+}
 
-void Workspace::createBorderWindows()
+void Workspace::destroyActiveBorders()
+{
+    for (int pos = 0; pos < ACTIVE_BORDER_COUNT; ++pos)
     {
-    if ( electric_have_borders )
+        if (active_windows[ pos ] != None)
+        {
+            XDestroyWindow( tqt_xdisplay(), active_windows[ pos ] );
+        }
+        active_windows[ pos ] = None;
+    }
+}
+
+void Workspace::reserveActiveBorderSwitching( bool reserve )
+{
+    for (int pos = 0; pos < ACTIVE_BORDER_COUNT; ++pos)
+    {
+        if (reserve)
+        {
+            reserveActiveBorder(static_cast<ActiveBorder>(pos));
+        }
+        else
+        {
+            unreserveActiveBorder(static_cast<ActiveBorder>(pos));
+        }
+    }
+}
+
+void Workspace::reserveActiveBorder( ActiveBorder border )
+{
+    if (border == ActiveNone)
         return;
 
-    electric_have_borders = true;
+    if (active_reserved[border]++ == 0)
+        TQTimer::singleShot(0, this, TQT_SLOT(updateActiveBorders()));
+}
 
-    TQRect r = TQApplication::desktop()->geometry();
-    XSetWindowAttributes attributes;
-    unsigned long valuemask;
-    attributes.override_redirect = True;
-    attributes.event_mask =  ( EnterWindowMask | LeaveWindowMask );
-    valuemask=  (CWOverrideRedirect | CWEventMask | CWCursor );
-    attributes.cursor = XCreateFontCursor(tqt_xdisplay(),
-                                          XC_sb_up_arrow);
-    electric_top_border = XCreateWindow (tqt_xdisplay(), tqt_xrootwin(),
-                                0,0,
-                                r.width(),1,
-                                0,
-                                CopyFromParent, InputOnly,
-                                CopyFromParent,
-                                valuemask, &attributes);
-    XMapWindow(tqt_xdisplay(), electric_top_border);
-
-    attributes.cursor = XCreateFontCursor(tqt_xdisplay(),
-                                          XC_sb_down_arrow);
-    electric_bottom_border = XCreateWindow (tqt_xdisplay(), tqt_xrootwin(),
-                                   0,r.height()-1,
-                                   r.width(),1,
-                                   0,
-                                   CopyFromParent, InputOnly,
-                                   CopyFromParent,
-                                   valuemask, &attributes);
-    XMapWindow(tqt_xdisplay(), electric_bottom_border);
-
-    attributes.cursor = XCreateFontCursor(tqt_xdisplay(),
-                                          XC_sb_left_arrow);
-    electric_left_border = XCreateWindow (tqt_xdisplay(), tqt_xrootwin(),
-                                 0,0,
-                                 1,r.height(),
-                                 0,
-                                 CopyFromParent, InputOnly,
-                                 CopyFromParent,
-                                 valuemask, &attributes);
-    XMapWindow(tqt_xdisplay(), electric_left_border);
-
-    attributes.cursor = XCreateFontCursor(tqt_xdisplay(),
-                                          XC_sb_right_arrow);
-    electric_right_border = XCreateWindow (tqt_xdisplay(), tqt_xrootwin(),
-                                  r.width()-1,0,
-                                  1,r.height(),
-                                  0,
-                                  CopyFromParent, InputOnly,
-                                  CopyFromParent,
-                                  valuemask, &attributes);
-    XMapWindow(tqt_xdisplay(),  electric_right_border);
-    // Set XdndAware on the windows, so that DND enter events are received (#86998)
-    Atom version = 4; // XDND version
-    XChangeProperty( tqt_xdisplay(), electric_top_border, atoms->xdnd_aware, XA_ATOM,
-        32, PropModeReplace, ( unsigned char* )&version, 1 );
-    XChangeProperty( tqt_xdisplay(), electric_bottom_border, atoms->xdnd_aware, XA_ATOM,
-        32, PropModeReplace, ( unsigned char* )&version, 1 );
-    XChangeProperty( tqt_xdisplay(), electric_left_border, atoms->xdnd_aware, XA_ATOM,
-        32, PropModeReplace, ( unsigned char* )&version, 1 );
-    XChangeProperty( tqt_xdisplay(), electric_right_border, atoms->xdnd_aware, XA_ATOM,
-        32, PropModeReplace, ( unsigned char* )&version, 1 );
-    }
-
-
-// Electric Border Window management. Electric borders allow a user
-// to change the virtual desktop by moving the mouse pointer to the
-// borders. Technically this is done with input only windows. Since
-// electric borders can be switched on and off, we have these two
-// functions to create and destroy them.
-void Workspace::destroyBorderWindows()
-    {
-    if( !electric_have_borders)
-      return;
-
-    electric_have_borders = false;
-
-    if(electric_top_border)
-      XDestroyWindow(tqt_xdisplay(),electric_top_border);
-    if(electric_bottom_border)
-      XDestroyWindow(tqt_xdisplay(),electric_bottom_border);
-    if(electric_left_border)
-      XDestroyWindow(tqt_xdisplay(),electric_left_border);
-    if(electric_right_border)
-      XDestroyWindow(tqt_xdisplay(),electric_right_border);
-
-    electric_top_border    = None;
-    electric_bottom_border = None;
-    electric_left_border   = None;
-    electric_right_border  = None;
-    }
-
-void Workspace::clientMoved(const TQPoint &pos, Time now)
-    {
-    if (options->electricBorders() == Options::ElectricDisabled)
-       return;
+void Workspace::unreserveActiveBorder( ActiveBorder border )
+{
+    if (border == ActiveNone)
+        return;
 
-    if ((pos.x() != electricLeft) &&
-        (pos.x() != electricRight) &&
-        (pos.y() != electricTop) &&
-        (pos.y() != electricBottom))
-       return;
+    assert(active_reserved[ border ] > 0);
+    if (--active_reserved[ border ] == 0)
+        TQTimer::singleShot(0, this, TQT_SLOT(updateActiveBorders()));
+}
 
-    Time treshold_set = options->electricBorderDelay(); // set timeout
+void Workspace::checkActiveBorder(const TQPoint &pos, Time now)
+{
+    Time treshold_set = options->activeBorderDelay(); // set timeout
+    Time treshold_trigger = 250; // Minimum time between triggers
     Time treshold_reset = 250; // reset timeout
     int distance_reset = 30; // Mouse should not move more than this many pixels
 
-    int border = 0;
-    if (pos.x() == electricLeft)
-       border = 1;
-    else if (pos.x() == electricRight)
-       border = 2;
-    else if (pos.y() == electricTop)
-       border = 3;
-    else if (pos.y() == electricBottom)
-       border = 4;
+    if ((pos.x() > activeLeft   + distance_reset) &&
+        (pos.x() < activeRight  - distance_reset) &&
+        (pos.y() > activeTop    + distance_reset) &&
+        (pos.y() < activeBottom - distance_reset))
+    {
+        if (movingClient &&
+           (options->activeBorders() == Options::ActiveTileMaximize ||
+            options->activeBorders() == Options::ActiveTileOnly))
+        {
+            movingClient->setActiveBorderMaximizing(false);
+        }
+    }
 
-    if ((electric_current_border == border) &&
-        (timestampDiff(electric_time_last, now) < treshold_reset) &&
-        ((pos-electric_push_point).manhattanLength() < distance_reset))
+    if ((pos.x() != activeLeft) &&
+        (pos.x() != activeRight) &&
+        (pos.y() != activeTop) &&
+        (pos.y() != activeBottom))
+       return;
+
+    bool have_borders = false;
+    for (int i = 0; i < ACTIVE_BORDER_COUNT; ++i)
+    {
+        if (active_windows[ i ] != None)
         {
-        electric_time_last = now;
+            have_borders = true;
+        }
+    }
+    if( !have_borders )
+        return;
+
+    ActiveBorder border;
+    if( pos.x() == activeLeft && pos.y() == activeTop )
+        border = ActiveTopLeft;
+    else if( pos.x() == activeRight && pos.y() == activeTop )
+        border = ActiveTopRight;
+    else if( pos.x() == activeLeft && pos.y() == activeBottom )
+        border = ActiveBottomLeft;
+    else if( pos.x() == activeRight && pos.y() == activeBottom )
+        border = ActiveBottomRight;
+    else if( pos.x() == activeLeft )
+        border = ActiveLeft;
+    else if( pos.x() == activeRight )
+        border = ActiveRight;
+    else if( pos.y() == activeTop )
+        border = ActiveTop;
+    else if( pos.y() == activeBottom )
+        border = ActiveBottom;
+    else
+        abort();
 
-        if (timestampDiff(electric_time_first, now) > treshold_set)
+    if( active_windows[border] == None )
+        return;
+
+    if ((active_current_border == border) &&
+        (timestampDiff(active_time_last, now) < treshold_reset) &&
+        (timestampDiff(active_time_last_trigger, now) > treshold_trigger) &&
+        ((pos-active_push_point).manhattanLength() < distance_reset))
+    {
+        active_time_last = now;
+
+        if (timestampDiff(active_time_first, now) > treshold_set)
+        {
+            active_time_last_trigger = now;
+            active_current_border = ActiveNone;
+            bool isSide = (border == ActiveTop || border == ActiveRight ||
+                           border == ActiveBottom || border == ActiveLeft);
+
+            if (movingClient)
             {
-            electric_current_border = 0;
+                // Desktop switching
+                if (options->activeBorders() == Options::ActiveSwitchAlways ||
+                    options->activeBorders() == Options::ActiveSwitchOnMove)
+                {
+                    activeBorderSwitchDesktop(border, pos);
+                    return; // Don't reset cursor position
+                }
 
-            TQRect r = TQApplication::desktop()->geometry();
-            int offset;
+                // Tiling maximize
+                else if (options->activeBorders() == Options::ActiveTileMaximize &&
+                         border == ActiveTop && movingClient->isMaximizable())
+                {
+                    if (!movingClient->isResizable()) return;
+                    bool enable = !movingClient->isActiveBorderMaximizing();
+                    movingClient->setActiveBorderMode(ActiveMaximizeMode);
+                    movingClient->setActiveBorderMaximizing(enable);
+                }
 
-            int desk_before = currentDesktop();
-            switch(border)
+                // Tiling
+                else if ((options->activeBorders() == Options::ActiveTileMaximize ||
+                          options->activeBorders() == Options::ActiveTileOnly) && isSide)
                 {
-                case 1:
-                 slotSwitchDesktopLeft();
-                 if (currentDesktop() != desk_before) 
+                    if (!movingClient->isResizable()) return;
+                    bool enable = !movingClient->isActiveBorderMaximizing();
+                    bool activate = false;
+                    if (border == ActiveLeft)
                     {
-                    offset = r.width() / 5;
-                    TQCursor::setPos(r.width() - offset, pos.y());
+                        movingClient->setActiveBorderMode( ActiveLeftMode );
+                        activate = true;
                     }
-                break;
-
-               case 2:
-                slotSwitchDesktopRight();
-                if (currentDesktop() != desk_before) 
+                    else if (border == ActiveRight)
                     {
-                    offset = r.width() / 5;
-                    TQCursor::setPos(offset, pos.y());
+                        movingClient->setActiveBorderMode( ActiveRightMode );
+                        activate = true;
                     }
-                break;
-
-               case 3:
-                slotSwitchDesktopUp();
-                if (currentDesktop() != desk_before) 
+                    else if (border == ActiveTop)
                     {
-                    offset = r.height() / 5;
-                    TQCursor::setPos(pos.x(), r.height() - offset);
+                        movingClient->setActiveBorderMode( ActiveTopMode );
+                        activate = true;
+                    }
+                    else if (border == ActiveBottom)
+                    {
+                        movingClient->setActiveBorderMode( ActiveBottomMode );
+                        activate = true;
                     }
-                break;
 
-               case 4:
-                slotSwitchDesktopDown();
-                if (currentDesktop() != desk_before) 
+                    if (activate)
                     {
-                    offset = r.height() / 5;
-                    TQCursor::setPos(pos.x(), offset);
+                        movingClient->setActiveBorderMaximizing(enable);
                     }
-                break;
                 }
-            return;
+
+                else
+                {
+                    return; // Don't reset cursor position
+                }
+            }
+            else
+            {
+                // Desktop switching
+                if (options->activeBorders() == Options::ActiveSwitchAlways && isSide)
+                {
+                    activeBorderSwitchDesktop(border, pos);
+                    return; // Don't reset cursor position
+                }
             }
         }
-    else 
-        {
-        electric_current_border = border;
-        electric_time_first = now;
-        electric_time_last = now;
-        electric_push_point = pos;
-        }
+    }
+    else
+    {
+        active_current_border = border;
+        active_time_first = now;
+        active_time_last = now;
+        active_push_point = pos;
+    }
 
-    int mouse_warp = 1;
+    // reset the pointer to find out wether the user is really pushing
+    // (the direction back from which it came, starting from top clockwise)
+    const int xdiff[ ACTIVE_BORDER_COUNT ] = { 0, -1, -1, -1, 0, 1, 1, 1 };
+    const int ydiff[ ACTIVE_BORDER_COUNT ] = { 1, 1, 0, -1, -1, -1, 0, 1 };
+    TQCursor::setPos(pos.x() + xdiff[border], pos.y() + ydiff[border]);
 
-  // reset the pointer to find out wether the user is really pushing
-    switch( border)
-        {
-        case 1: TQCursor::setPos(pos.x()+mouse_warp, pos.y()); break;
-        case 2: TQCursor::setPos(pos.x()-mouse_warp, pos.y()); break;
-        case 3: TQCursor::setPos(pos.x(), pos.y()+mouse_warp); break;
-        case 4: TQCursor::setPos(pos.x(), pos.y()-mouse_warp); break;
-        }
     }
 
-// this function is called when the user entered an electric border
+void Workspace::activeBorderSwitchDesktop(ActiveBorder border, const TQPoint& _pos)
+{
+    TQPoint pos = _pos;
+    TQRect r = TQApplication::desktop()->geometry();
+    const int offset = 5;
+
+    int desk_before = currentDesktop();
+    if (border == ActiveLeft || border == ActiveTopLeft || border == ActiveBottomLeft)
+    {
+            slotSwitchDesktopLeft();
+            pos.setX(r.width() - offset);
+    }
+    if (border == ActiveRight || border == ActiveTopRight || border == ActiveBottomRight)
+    {
+            slotSwitchDesktopRight();
+            pos.setX(offset);
+    }
+
+    if (border == ActiveTop || border == ActiveTopLeft || border == ActiveTopRight)
+    {
+            slotSwitchDesktopUp();
+            pos.setY(r.height() - offset);
+    }
+    if (border == ActiveBottom || border == ActiveBottomLeft || border == ActiveBottomRight)
+    {
+            slotSwitchDesktopDown();
+            pos.setY(offset);
+    }
+
+    if (currentDesktop() != desk_before)
+    {
+        TQCursor::setPos(pos);
+    }
+}
+
+// this function is called when the user entered an active border
 // with the mouse. It may switch to another virtual desktop
-bool Workspace::electricBorder(XEvent *e)
+bool Workspace::activeBorderEvent(XEvent *e)
+{
+    if (e->type == EnterNotify)
     {
-    if( !electric_have_borders )
-        return false;
-    if( e->type == EnterNotify )
+        for (int i = 0; i < ACTIVE_BORDER_COUNT; ++i)
         {
-        if( e->xcrossing.window == electric_top_border ||
-            e->xcrossing.window == electric_left_border ||
-            e->xcrossing.window == electric_bottom_border ||
-            e->xcrossing.window == electric_right_border)
-            // the user entered an electric border
-            {
-            clientMoved( TQPoint( e->xcrossing.x_root, e->xcrossing.y_root ), e->xcrossing.time );
-            return true;
+            if (active_windows[i] != None && e->xcrossing.window == active_windows[i])
+            { // the user entered an active border
+                checkActiveBorder(TQPoint(e->xcrossing.x_root, e->xcrossing.y_root), e->xcrossing.time);
+                return true;
             }
         }
-    if( e->type == ClientMessage )
-        {
-        if( e->xclient.message_type == atoms->xdnd_position
-            && ( e->xclient.window == electric_top_border
-                 || e->xclient.window == electric_bottom_border
-                 || e->xclient.window == electric_left_border
-                 || e->xclient.window == electric_right_border ))
-            {
-            updateXTime();
-            clientMoved( TQPoint( e->xclient.data.l[2]>>16, e->xclient.data.l[2]&0xffff), GET_QT_X_TIME() );
-            return true;
-            }
-        }
-    return false;
     }
-
-// electric borders (input only windows) have to be always on the
-// top. For that reason kwm calls this function always after some
-// windows have been raised.
-void Workspace::raiseElectricBorders()
+    if (e->type == ClientMessage)
     {
-
-    if(electric_have_borders)
+        if (e->xclient.message_type == atoms->xdnd_position)
         {
-        XRaiseWindow(tqt_xdisplay(), electric_top_border);
-        XRaiseWindow(tqt_xdisplay(), electric_left_border);
-        XRaiseWindow(tqt_xdisplay(), electric_bottom_border);
-        XRaiseWindow(tqt_xdisplay(), electric_right_border);
+            for (int i = 0; i < ACTIVE_BORDER_COUNT; ++i)
+            {
+                if (active_windows[i] != None && e->xclient.window == active_windows[i])
+                {
+                    updateXTime();
+                    checkActiveBorder(TQPoint(e->xclient.data.l[2]>>16, e->xclient.data.l[2]&0xffff), GET_QT_X_TIME());
+                    return true;
+                }
+            }
         }
     }
+    return false;
+}
 
 void Workspace::addTopMenu( Client* c )
     {