Removes most of aura dependencies from DefaultState

ash/wm/common/window_positioning_utils.cc

 // Copyright 2016 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/common/window_positioning_utils.h"
 
 #include <algorithm>
 
+#include "ash/wm/common/wm_screen_util.h"
+#include "ash/wm/common/wm_window.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace ash {
 namespace wm {
 
+namespace {
+
+// Returns the default width of a snapped window.
+int GetDefaultSnappedWindowWidth(WmWindow* window) {
+  const float kSnappedWidthWorkspaceRatio = 0.5f;
+
+  int work_area_width = GetDisplayWorkAreaBoundsInParent(window).width();
+  int min_width = window->GetMinimumSize().width();
+  int ideal_width =
+      static_cast<int>(work_area_width * kSnappedWidthWorkspaceRatio);
+  return std::min(work_area_width, std::max(ideal_width, min_width));
+}
+
+}  // namespace
+
 void AdjustBoundsSmallerThan(const gfx::Size& max_size, gfx::Rect* bounds) {
   bounds->set_width(std::min(bounds->width(), max_size.width()));
   bounds->set_height(std::min(bounds->height(), max_size.height()));
 }
 
 void AdjustBoundsToEnsureWindowVisibility(const gfx::Rect& visible_area,
                                           int min_width,
                                           int min_height,
                                           gfx::Rect* bounds) {
   AdjustBoundsSmallerThan(visible_area.size(), bounds);
@@ skipping 14 matching lines @@
   if (bounds->y() < visible_area.y())
     bounds->set_y(visible_area.y());
 }
 
 void AdjustBoundsToEnsureMinimumWindowVisibility(const gfx::Rect& visible_area,
                                                  gfx::Rect* bounds) {
   AdjustBoundsToEnsureWindowVisibility(visible_area, kMinimumOnScreenArea,
                                        kMinimumOnScreenArea, bounds);
 }
 
+gfx::Rect GetDefaultLeftSnappedWindowBoundsInParent(wm::WmWindow* window) {
+  gfx::Rect work_area_in_parent(GetDisplayWorkAreaBoundsInParent(window));
+  return gfx::Rect(work_area_in_parent.x(), work_area_in_parent.y(),
+                   GetDefaultSnappedWindowWidth(window),
+                   work_area_in_parent.height());
+}
+
+gfx::Rect GetDefaultRightSnappedWindowBoundsInParent(wm::WmWindow* window) {
+  gfx::Rect work_area_in_parent(GetDisplayWorkAreaBoundsInParent(window));
+  int width = GetDefaultSnappedWindowWidth(window);
+  return gfx::Rect(work_area_in_parent.right() - width, work_area_in_parent.y(),
+                   width, work_area_in_parent.height());
+}
+
 }  // namespace wm
 }  // namespace ash