aura: Add an EasyResizeWindowTargeter.

ui/wm/core/easy_resize_window_targeter.cc

Index: ui/wm/core/easy_resize_window_targeter.cc
diff --git a/ui/wm/core/easy_resize_window_targeter.cc b/ui/wm/core/easy_resize_window_targeter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f3a2b0a77ebcdb09506581d4daa95ca4b2d2c4de
--- /dev/null
+++ b/ui/wm/core/easy_resize_window_targeter.cc
@@ -0,0 +1,48 @@
+// Copyright 2014 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 "ui/wm/public/easy_resize_window_targeter.h"
+
+#include "ui/aura/window.h"
+#include "ui/gfx/geometry/insets_f.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace wm {
+
+EasyResizeWindowTargeter::EasyResizeWindowTargeter(
+    aura::Window* container,
+    const gfx::Insets& mouse_extend,
+    const gfx::Insets& touch_extend)
+    : container_(container),
+      mouse_extend_(mouse_extend),
+      touch_extend_(touch_extend) {
+}
+
+EasyResizeWindowTargeter::~EasyResizeWindowTargeter() {
+}
+
+bool EasyResizeWindowTargeter::EventLocationInsideBounds(
+    aura::Window* window,
+    const ui::LocatedEvent& event) const {
+  // Use the extended bounds only for immediate child windows of |container_|.
+  // Use the default targetter otherwise.
+  if (window->parent() == container_ && (!window->transient_parent() ||
+      window->transient_parent() == container_)) {
+    gfx::RectF bounds(window->bounds());
+    gfx::Transform transform = window->layer()->transform();
+    transform.TransformRect(&bounds);
+    if (event.IsTouchEvent() || event.IsGestureEvent()) {
+      bounds.Inset(touch_extend_);
+    } else {
+      bounds.Inset(mouse_extend_);
+    }
+
+    // Note that |event|'s location is in the |container_|'s coordinate system,
+    // as is |bounds|.
+    return bounds.Contains(event.location());
+  }
+  return WindowTargeter::EventLocationInsideBounds(window, event);
+}
+
+}  // namespace wm