Ticket #1837: RectTracking.patch

ServerWindow.h

@@ -180 +180 @@
 
             DirectWindowInfo*   fDirectWindowInfo;
             bool                fIsDirectlyAccessing;
+
+            BRect               fTrackedRect;
+            bool                fIsTrackingRect;
 };
 
 #endif  // SERVER_WINDOW_H

ServerWindow.cpp

@@ -171 +171 @@
     fCurrentDrawingRegionValid(false),
 
     fDirectWindowInfo(NULL),
-    fIsDirectlyAccessing(false)
+    fIsDirectlyAccessing(false),
+
+    fIsTrackingRect(false)
 {
     STRACE(("ServerWindow(%s)::ServerWindow()\n", title));
 
@@ -2055 +2057 @@
 
         case AS_VIEW_BEGIN_RECT_TRACK:
         {
-            DTRACE(("ServerWindow %s: Message AS_VIEW_BEGIN_RECT_TRACK\n",
-                Title()));
-            BRect dragRect;
+            /*DTRACE*/debug_printf("ServerWindow %s: Message AS_VIEW_BEGIN_RECT_TRACK\n",
+                Title());
             uint32 style;
 
-            link.Read<BRect>(&dragRect);
+            link.Read<BRect>(&fTrackedRect);
             link.Read<uint32>(&style);
 
-            // TODO: implement rect tracking (used sometimes for selecting
-            // a group of things, also sometimes used to appear to drag
-            // something, but without real drag message)
+            fCurrentView->ConvertToScreenForDrawing(&fTrackedRect);
+            fIsTrackingRect = true;
             break;
         }
         case AS_VIEW_END_RECT_TRACK:
         {
-            DTRACE(("ServerWindow %s: Message AS_VIEW_END_RECT_TRACK\n",
-                Title()));
-            // TODO: implement rect tracking
+            /*DTRACE*/debug_printf("ServerWindow %s: Message AS_VIEW_END_RECT_TRACK\n",
+                Title());
+            //drawingEngine->InvertRect(fTrackedRect);
+            fIsTrackingRect = false;
             break;
         }
 
@@ -2835 +2836 @@
             break;
     }
 
+    if (fIsTrackingRect) {
+        debug_printf("Drawing trackrect : %f %f %f %f",fTrackedRect.top,
+            fTrackedRect.bottom, fTrackedRect.left, fTrackedRect.right);
+        //drawingEngine->InvertRect(fTrackedRect);
+            // erase the old rectangle
+
+        BPoint where;
+        int32 buttons;
+        fDesktop->GetLastMouseState(&where, &buttons);
+
+        if (where.x < fTrackedRect.left) {
+            if (where.y < fTrackedRect.top)
+                fTrackedRect.SetLeftTop(where);
+            else
+                fTrackedRect.SetLeftBottom(where);
+        } else {
+            if (where.y < fTrackedRect.top)
+                fTrackedRect.SetRightTop(where);
+            else
+                fTrackedRect.SetRightBottom(where);
+        }
+        drawingEngine->StrokeRect(fTrackedRect);
+        BRegion dirty(fTrackedRect);
+        fWindow->InvalidateView(fCurrentView, dirty);
+    }
+
     drawingEngine->UnlockParallelAccess();
 }