Allow offset for secondary display position in chrome://settings/display.

ash/display/display_controller.cc

Index: ash/display/display_controller.cc
diff --git a/ash/display/display_controller.cc b/ash/display/display_controller.cc
index a4eceb48bb21abb1c6697eb46ab5557eebcdd370..2154f0ae206edd4808fffa99bc7eeca8214034a5 100644
--- a/ash/display/display_controller.cc
+++ b/ash/display/display_controller.cc
@@ -23,7 +23,8 @@ namespace ash {
 namespace internal {
 
 DisplayController::DisplayController()
-    : secondary_display_layout_(RIGHT) {
+    : secondary_display_layout_(RIGHT),
+      secondary_display_offset_(0) {
   aura::Env::GetInstance()->display_manager()->AddObserver(this);
 }
 
@@ -120,6 +121,11 @@ void DisplayController::SetSecondaryDisplayLayout(
   UpdateDisplayBoundsForLayout();
 }
 
+void DisplayController::SetSecondaryDisplayOffset(int offset) {
+  secondary_display_offset_ = offset;
+  UpdateDisplayBoundsForLayout();
+}
+
 bool DisplayController::WarpMouseCursorIfNecessary(
     aura::RootWindow* current_root,
     const gfx::Point& point_in_root) {
@@ -237,16 +243,20 @@ void DisplayController::UpdateDisplayBoundsForLayout() {
   // TODO(oshima|mukai): Implement more flexible layout.
   switch (secondary_display_layout_) {
     case TOP:
-      new_secondary_origin.Offset(0, -secondary_bounds.height());
+      new_secondary_origin.Offset(
+          secondary_display_offset_, -secondary_bounds.height());
       break;
     case RIGHT:
-      new_secondary_origin.Offset(primary_bounds.width(), 0);
+      new_secondary_origin.Offset(
+          primary_bounds.width(), secondary_display_offset_);
       break;
     case BOTTOM:
-      new_secondary_origin.Offset(0, primary_bounds.height());
+      new_secondary_origin.Offset(
+          secondary_display_offset_, primary_bounds.height());
       break;
     case LEFT:
-      new_secondary_origin.Offset(-secondary_bounds.width(), 0);
+      new_secondary_origin.Offset(
+          -secondary_bounds.width(), secondary_display_offset_);
       break;
   }

[oshima, 2012/08/06 04:15:55]

you need to check & adjust the offset if the secondary display is detached from
the primary.

[Jun Mukai, 2012/08/06 05:27:27]

Added the check for offset value above.

   gfx::Insets insets = secondary_display->GetWorkAreaInsets();