Windows docking should get triggered by pressing against the screen edge

ash/wm/workspace/snap_sizer.cc

 // Copyright (c) 2012 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/workspace/snap_sizer.h"
 
 #include <cmath>
 
 #include "ash/ash_switches.h"
 #include "ash/screen_ash.h"
@@ skipping 60 matching lines @@
     // and close).
     width = work_area.width() / 2;
   } else {
     width = std::max(kDefaultWidthSmallScreen, work_area.width() / 2);
   }
 
   width = std::min(width, GetMaxWidth(window));
   return std::max(width, GetMinWidth(window));
 }
 
-// Create the list of possible widths for the current screen configuration:
-// Fill the |usable_width_| list with items from |kIdealWidth| which fit on
-// the screen and supplement it with the 'half of screen' size. Furthermore,
-// add an entry for 90% of the screen size if it is smaller than the biggest
-// value in the |kIdealWidth| list (to get a step between the values).
+// Creates the list of possible width for the current screen configuration:
+// Returns a list with items from |kIdealWidth| which fit on the screen and
+// supplement it with the 'half of screen' size. Furthermore, add an entry for
+// 90% of the screen size if it is smaller than the biggest value in the
+// |kIdealWidth| list (to get a step between the values).
 std::vector<int> BuildIdealWidthList(aura::Window* window) {
   if (ash::switches::UseAlternateFrameCaptionButtonStyle()) {
     // Only the 'half of screen' width is supported when using the alternate
     // visual style for the frame caption buttons (minimize, maximize,
     // restore, and close).
     return std::vector<int>(1u, GetDefaultWidth(window));
   }
 
   int minimum_width = GetMinWidth(window);
   int maximum_width = GetMaxWidth(window);
@@ skipping 30 matching lines @@
 }  // namespace
 
 SnapSizer::SnapSizer(aura::Window* window,
                      const gfx::Point& start,
                      Edge edge,
                      InputType input_type)
     : window_(window),
       edge_(edge),
       time_last_update_(base::TimeTicks::Now()),
       size_index_(0),
+      end_of_sequence_(false),
       resize_disabled_(false),
       num_moves_since_adjust_(0),
       last_adjust_x_(start.x()),
       last_update_x_(start.x()),
       start_x_(start.x()),
       input_type_(input_type),
       usable_width_(BuildIdealWidthList(window)) {
   DCHECK(!usable_width_.empty());
   target_bounds_ = GetTargetBounds();
 }
@@ skipping 65 matching lines @@
     }
   }
   if (current < 0)
     current = 0;
   return GetTargetBoundsForSize(current % usable_width_.size());
 }
 
 void SnapSizer::SelectDefaultSizeAndDisableResize() {
   resize_disabled_ = true;
   size_index_ = 0;
+  end_of_sequence_ = false;
   target_bounds_ = GetTargetBounds();
 }
 
 gfx::Rect SnapSizer::GetTargetBoundsForSize(size_t size_index) const {
   gfx::Rect work_area(ScreenAsh::GetDisplayWorkAreaBoundsInParent(window_));
   int y = work_area.y();
   int max_y = work_area.bottom();
   int width = 0;
   if (resize_disabled_) {
     width = GetDefaultWidth(window_);
@@ skipping 22 matching lines @@
       return 1;
     return -1;
   }
   // edge_ == RIGHT_EDGE.
   if (x > reference_x)
     return 1;
   return -1;
 }
 
 void SnapSizer::ChangeBounds(int x, int delta) {
+  end_of_sequence_ =
+      delta > 0 && size_index_ == static_cast<int>(usable_width_.size()) - 1;
   int index = std::min(static_cast<int>(usable_width_.size()) - 1,
                        std::max(size_index_ + delta, 0));
   if (index != size_index_) {
     size_index_ = index;
     target_bounds_ = GetTargetBounds();
   }
   num_moves_since_adjust_ = 0;
   last_adjust_x_ = x;
 }
 
 gfx::Rect SnapSizer::GetTargetBounds() const {
   return GetTargetBoundsForSize(size_index_);
 }
 
 bool SnapSizer::AlongEdge(int x) const {
-  gfx::Rect area(ScreenAsh::GetDisplayBoundsInParent(window_));
+  gfx::Rect area(ScreenAsh::GetDisplayWorkAreaBoundsInParent(window_));
   return (x <= area.x()) || (x >= area.right() - 1);
 }
 
 }  // namespace internal
 }  // namespace ash