CHOP-763: Add LLView::TemporaryDrilldownFunc to support UI injection.

Instead of unconditionally calling LLView::pointInView(),
LLView::visibleAndContains() now consults a class-static boost::function
called sDrilldown -- which is initialized to LLView::pointInView().
Introduce LLView::TemporaryDrilldownFunc, instantiated with a callable whose
signature is compatible with LLView::pointInView(). This replaces sDrilldown,
but only for the life of the TemporaryDrilldownFunc object.
Introduce llview::TargetEvent, an object intended to serve as a
TemporaryDrilldownFunc callable. Construct it with a desired target LLView*
and pass it to TemporaryDrilldownFunc. When called with each candidate child
LLView*, instead of selecting the one containing the particular (x, y) point,
it selects the one that will lead to the ultimate desired target LLView*.
Add optional 'recur' param to LLView::childFromPoint(); default is current
one-level behavior. But when you pass recur=true, it should return the
frontmost visible leaf LLView containing the passed (x, y) point.

1 files changed, 49 insertions, 0 deletions

diff --git a/indra/llui/llviewinject.cpp b/indra/llui/llviewinject.cpp
new file mode 100644
index 0000000000..46c5839f8e
--- /dev/null
+++ b/indra/llui/llviewinject.cpp
@@ -0,0 +1,49 @@
+/**
+ * @file   llviewinject.cpp
+ * @author Nat Goodspeed
+ * @date   2011-08-16
+ * @brief  Implementation for llviewinject.
+ * 
+ * $LicenseInfo:firstyear=2011&license=viewerlgpl$
+ * Copyright (c) 2011, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+// Precompiled header
+#include "linden_common.h"
+// associated header
+#include "llviewinject.h"
+// STL headers
+// std headers
+// external library headers
+// other Linden headers
+
+llview::TargetEvent::TargetEvent(LLView* view)
+{
+    // Walk up the view tree from target LLView to the root (NULL). If
+    // passed NULL, iterate 0 times.
+    for (; view; view = view->getParent())
+    {
+        // At each level, operator() is going to ask: for a particular parent
+        // LLView*, which of its children should I select? So for this view's
+        // parent, select this view.
+        mChildMap[view->getParent()] = view;
+    }
+}
+
+bool llview::TargetEvent::operator()(const LLView* view, S32 /*x*/, S32 /*y*/) const
+{
+    // We are being called to decide whether to direct an incoming mouse event
+    // to this child view. (Normal LLView processing is to check whether the
+    // incoming (x, y) is within the view.) Look up the parent to decide
+    // whether, for that parent, this is the previously-selected child.
+    ChildMap::const_iterator found(mChildMap.find(view->getParent()));
+    // If we're looking at a child whose parent isn't even in the map, never
+    // mind.
+    if (found == mChildMap.end())
+    {
+        return false;
+    }
+    // So, is this the predestined child for this parent?
+    return (view == found->second);
+}