Change behaviour of the Alt-] and Alt-[ keys so that it cycles through SnapLeft/SnapRight to DockLe…

ash/wm/dock/docked_window_layout_manager.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/dock/docked_window_layout_manager.h"
 
 #include "ash/screen_util.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_layout_manager.h"
@@ skipping 398 matching lines @@
       in_layout_(false),
       dragged_window_(NULL),
       is_dragged_window_docked_(false),
       is_dragged_from_dock_(false),
       shelf_(NULL),
       workspace_controller_(workspace_controller),
       in_fullscreen_(workspace_controller_->GetWindowState() ==
                      WORKSPACE_WINDOW_STATE_FULL_SCREEN),
       docked_width_(0),
       alignment_(DOCKED_ALIGNMENT_NONE),
+      preferred_alignment_(DOCKED_ALIGNMENT_NONE),
       last_active_window_(NULL),
       last_action_time_(base::Time::Now()),
       background_widget_(new DockedBackgroundWidget(dock_container_)) {
   DCHECK(dock_container);
   aura::client::GetActivationClient(Shell::GetPrimaryRootWindow())->
       AddObserver(this);
   Shell::GetInstance()->AddShellObserver(this);
 }
 
 DockedWindowLayoutManager::~DockedWindowLayoutManager() {
@@ skipping 159 matching lines @@
   for (size_t i = 0; i < dock_container_->children().size(); ++i) {
     aura::Window* child(dock_container_->children()[i]);
     if (window != child && !IsPopupOrTransient(child))
       return alignment_;
   }
   // No docked windows remain other than possibly the window being queried.
   // Return |NONE| to indicate that windows may get docked on either side.
   return DOCKED_ALIGNMENT_NONE;
 }
 
+void DockedWindowLayoutManager::SetPreferredAlignment(
+    DockedAlignment preferred_alignment) {
+  preferred_alignment_ = preferred_alignment;
+}
+
 bool DockedWindowLayoutManager::CanDockWindow(
     aura::Window* window,
     DockedAlignment desired_alignment) {
   // Don't allow interactive docking of windows with transient parents such as
   // modal browser dialogs. Prevent docking of panels attached to shelf during
   // the drag.
   wm::WindowState* window_state = wm::GetWindowState(window);
   bool should_attach_to_shelf = window_state->drag_details() &&
       window_state->drag_details()->should_attach_to_shelf;
   if (IsPopupOrTransient(window) || should_attach_to_shelf)
@@ skipping 74 matching lines @@
   if (IsPopupOrTransient(child))
     return;
   // Dragged windows are already observed by StartDragging and do not change
   // docked alignment during the drag.
   if (child == dragged_window_)
     return;
   // If this is the first window getting docked - update alignment.
   // A window can be added without proper bounds when window is moved to another
   // display via API or due to display configuration change, so the alignment
   // is set based on which edge is closer in the new display.
-  if (alignment_ == DOCKED_ALIGNMENT_NONE)
-    alignment_ = GetEdgeNearestWindow(child);
+  if (alignment_ == DOCKED_ALIGNMENT_NONE) {
+    alignment_ = preferred_alignment_ != DOCKED_ALIGNMENT_NONE ?
+      preferred_alignment_ : GetEdgeNearestWindow(child);
+  }
   MaybeMinimizeChildrenExcept(child);
   child->AddObserver(this);
   wm::GetWindowState(child)->AddObserver(this);
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::CHILD_CHANGED);
 }
 
 void DockedWindowLayoutManager::OnWindowRemovedFromLayout(aura::Window* child) {
   if (IsPopupOrTransient(child))
     return;
@@ skipping 140 matching lines @@
   if (!window_state->IsDocked()) {
     if (window != dragged_window_) {
       UndockWindow(window);
       if (window_state->IsMaximizedOrFullscreen())
         RecordUmaAction(DOCKED_ACTION_MAXIMIZE, DOCKED_ACTION_SOURCE_UNKNOWN);
     }
   } else if (window_state->IsMinimized()) {
     MinimizeDockedWindow(window_state);
   } else if (old_type == wm::WINDOW_STATE_TYPE_DOCKED_MINIMIZED) {
     RestoreDockedWindow(window_state);
+  } else if (old_type == wm::WINDOW_STATE_TYPE_MINIMIZED) {
+    NOTREACHED() << "Minimized window in docked layout manager";
   }
 }
 
 /////////////////////////////////////////////////////////////////////////////
 // DockedWindowLayoutManager, WindowObserver implementation:
 
 void DockedWindowLayoutManager::OnWindowBoundsChanged(
     aura::Window* window,
     const gfx::Rect& old_bounds,
     const gfx::Rect& new_bounds) {
@@ skipping 482 matching lines @@
 
 void DockedWindowLayoutManager::OnKeyboardBoundsChanging(
     const gfx::Rect& keyboard_bounds) {
   // This bounds change will have caused a change to the Shelf which does not
   // propagate automatically to this class, so manually recalculate bounds.
   Relayout();
   UpdateDockBounds(DockedWindowLayoutManagerObserver::KEYBOARD_BOUNDS_CHANGING);
 }
 
 }  // namespace ash