Make touch-resizing windows to screen edge possible

ash/wm/window_resizer.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/window_resizer.h"
 
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/window_util.h"
@@ skipping 89 matching lines @@
 const int WindowResizer::kBoundsChangeDirection_Horizontal = 1;
 // static
 const int WindowResizer::kBoundsChangeDirection_Vertical = 2;
 
 WindowResizer::Details::Details()
     : window(NULL),
       window_component(HTNOWHERE),
       bounds_change(0),
       position_change_direction(0),
       size_change_direction(0),
-      is_resizable(false) {
+      is_resizable(false),
+      source(aura::client::WINDOW_MOVE_SOURCE_MOUSE) {
 }
 
 WindowResizer::Details::Details(aura::Window* window,
                                 const gfx::Point& location,
-                                int window_component)
+                                int window_component,
+                                aura::client::WindowMoveSource source)
     : window(window),
       initial_bounds_in_parent(window->bounds()),
       restore_bounds(gfx::Rect()),
       initial_location_in_parent(location),
       initial_opacity(window->layer()->opacity()),
       window_component(window_component),
       bounds_change(GetBoundsChangeForWindowComponent(window_component)),
       position_change_direction(
           GetPositionChangeDirectionForWindowComponent(window_component)),
       size_change_direction(
           GetSizeChangeDirectionForWindowComponent(window_component)),
-      is_resizable(bounds_change != kBoundsChangeDirection_None) {
+      is_resizable(bounds_change != kBoundsChangeDirection_None),
+      source(source) {
   if (wm::IsWindowNormal(window) &&
       GetRestoreBoundsInScreen(window) &&
       window_component == HTCAPTION)
     restore_bounds = *GetRestoreBoundsInScreen(window);
 }
 
 WindowResizer::Details::~Details() {
 }
 
 WindowResizer::WindowResizer() {
@@ skipping 36 matching lines @@
   if (!details.is_resizable)
     return details.initial_bounds_in_parent;
 
   gfx::Point location = passed_location;
   gfx::Rect work_area =
       ScreenAsh::GetDisplayWorkAreaBoundsInParent(details.window);
 
   int delta_x = location.x() - details.initial_location_in_parent.x();
   int delta_y = location.y() - details.initial_location_in_parent.y();
 
+  AdjustDeltaForTouchResize(details, &delta_x, &delta_y);
+
   // The minimize size constraint may limit how much we change the window
   // position.  For example, dragging the left edge to the right should stop
   // repositioning the window when the minimize size is reached.
   gfx::Size size = GetSizeForDrag(details, &delta_x, &delta_y);
   gfx::Point origin = GetOriginForDrag(details, delta_x, delta_y);
   gfx::Rect new_bounds(origin, size);
 
   // Sizing has to keep the result on the screen. Note that this correction
   // has to come first since it might have an impact on the origin as well as
   // on the size.
@@ skipping 72 matching lines @@
 
 // static
 bool WindowResizer::IsBottomEdge(int window_component) {
   return window_component == HTBOTTOMLEFT ||
       window_component == HTBOTTOM ||
       window_component == HTBOTTOMRIGHT ||
       window_component == HTGROWBOX;
 }
 
 // static
+void WindowResizer::AdjustDeltaForTouchResize(const Details& details,
+                                              int* delta_x,
+                                              int* delta_y) {
+  if (details.source != aura::client::WINDOW_MOVE_SOURCE_TOUCH ||
+      !(details.bounds_change & kBoundsChange_Resizes))
+    return;
+
+  if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
+    if (IsRightEdge(details.window_component)) {
+      *delta_x += details.initial_location_in_parent.x() -
+          details.initial_bounds_in_parent.right();
+    } else {
+      *delta_x += details.initial_location_in_parent.x() -
+          details.initial_bounds_in_parent.x();
+    }
+  }
+  if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
+    if (IsBottomEdge(details.window_component)) {
+      *delta_y += details.initial_location_in_parent.y() -
+          details.initial_bounds_in_parent.bottom();
+    } else {
+      *delta_y += details.initial_location_in_parent.y() -
+          details.initial_bounds_in_parent.y();
+    }
+  }
+}
+
+// static
 gfx::Point WindowResizer::GetOriginForDrag(const Details& details,
                                            int delta_x,
                                            int delta_y) {
   gfx::Point origin = details.initial_bounds_in_parent.origin();
   if (details.bounds_change & kBoundsChange_Repositions) {
     int pos_change_direction =
         GetPositionChangeDirectionForWindowComponent(details.window_component);
     if (pos_change_direction & kBoundsChangeDirection_Horizontal)
       origin.Offset(delta_x, 0);
     if (pos_change_direction & kBoundsChangeDirection_Vertical)
@@ skipping 77 matching lines @@
     if (height > max_height) {
       height = max_height;
       *delta_y = -y_multiplier * (details.initial_bounds_in_parent.height() -
                                   max_height);
     }
   }
   return height;
 }
 
 }  // namespace aura