Add View::ReorderChildView and Widget::MoveToTop.

The z-ordering of child views is currently maintained (implicitly?) by the order
they are added to the parent view. It may often be necessary to change the
z-order of views, and View::ReorderChildView can be used to do that.

I changed views_desktop to have the two pure-views windows to have overlapping
regions, and View::ReorderChildView is used to change the z-ordering of the two
windows. So it is possible to click a window to activate it and bring it on top
of the other. It could have been done without adding Widget::MoveToTop, but
given Widget::MoveAbove and MoveAboveWidget, it sounded like a good idea to have
Widget::MoveToTop (MoveToFront?). I do now know what the implementation for
windows should be, though. So left it as NOTIMPLEMENTED.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7185005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89363 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 26 insertions, 0 deletions

diff --git a/views/view.cc b/views/view.cc
index c411621..a89ee23 100644
--- a/views/view.cc
+++ b/views/view.cc
@@ -176,6 +176,32 @@ void View::AddChildViewAt(View* view, int index) {
   view->MarkTextureDirty();
 }
 
+void View::ReorderChildView(View* view, int index) {
+  DCHECK_EQ(view->parent_, this);
+  if (index < 0)
+    index = child_count() - 1;
+  else if (index >= child_count())
+    return;
+  if (children_[index] == view)
+    return;
+
+  const Views::iterator i(std::find(children_.begin(), children_.end(), view));
+  DCHECK(i != children_.end());
+  children_.erase(i);
+
+  // Unlink the view first
+  View* next_focusable = view->next_focusable_view_;
+  View* prev_focusable = view->previous_focusable_view_;
+  if (prev_focusable)
+    prev_focusable->next_focusable_view_ = next_focusable;
+  if (next_focusable)
+    next_focusable->previous_focusable_view_ = prev_focusable;
+
+  // Add it in the specified index now.
+  InitFocusSiblings(view, index);
+  children_.insert(children_.begin() + index, view);
+}
+
 void View::RemoveChildView(View* view) {
   DoRemoveChildView(view, true, true, false);
 }