aura: Add an EasyResizeWindowTargeter.

Add EasyResizeWindowTargeter to allow easily resizing windows with mouse/touch
with the new event-dispatch code. This will eventually allow getting rid of
Window::SetHitTestBoundsOverrideOuter() once the new event-dispatch code is used
for all event types. This patch installs an EasyResizeWindowTargeter for the
shelf and status-area widgets. Subsequent CLs will install such targeters for the
toplevel windows too.

Collateral change includes adding some dependencies on wm_public (in DEPS and gyp).

BUG=318879
R=ben@chromium.org

Review URL: https://codereview.chromium.org/118553004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243177 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 107 insertions, 1 deletions

diff --git a/ui/wm/DEPS b/ui/wm/DEPS
new file mode 100644
index 0000000..98fe186
--- /dev/null
+++ b/ui/wm/DEPS
@@ -0,0 +1,4 @@
+include_rules = [
+  "+ui/aura",
+  "+ui/gfx",
+]
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 0000000..f3a2b0a
--- /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
diff --git a/ui/wm/public/easy_resize_window_targeter.h b/ui/wm/public/easy_resize_window_targeter.h
new file mode 100644
index 0000000..c4c7137
--- /dev/null
+++ b/ui/wm/public/easy_resize_window_targeter.h
@@ -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.
+
+#ifndef UI_WM_PUBLIC_EASY_RESIZE_WINDOW_TARGETER_H_
+#define UI_WM_PUBLIC_EASY_RESIZE_WINDOW_TARGETER_H_
+
+#include "ui/aura/window_targeter.h"
+#include "ui/gfx/geometry/insets.h"
+
+namespace wm {
+
+// An EventTargeter for a container window that uses a slightly larger
+// hit-target region for easier resize.
+class EasyResizeWindowTargeter : public aura::WindowTargeter {
+ public:
+  // |container| window is the owner of this targeter.
+  EasyResizeWindowTargeter(aura::Window* container,
+                           const gfx::Insets& mouse_extend,
+                           const gfx::Insets& touch_extend);
+
+  virtual ~EasyResizeWindowTargeter();
+
+ protected:
+  void set_mouse_extend(const gfx::Insets& mouse_extend) {
+    mouse_extend_ = mouse_extend;
+  }
+
+  void set_touch_extend(const gfx::Insets& touch_extend) {
+    touch_extend_ = touch_extend;
+  }
+
+  // aura::WindowTargeter:
+  virtual bool EventLocationInsideBounds(
+      aura::Window* window,
+      const ui::LocatedEvent& event) const OVERRIDE;
+
+ private:
+  aura::Window* container_;
+  gfx::Insets mouse_extend_;
+  gfx::Insets touch_extend_;
+
+  DISALLOW_COPY_AND_ASSIGN(EasyResizeWindowTargeter);
+};
+
+}  // namespace wm
+
+#endif  // UI_WM_PUBLIC_EASY_RESIZE_WINDOW_TARGETER_H_
diff --git a/ui/wm/wm.gyp b/ui/wm/wm.gyp
index 5063551..725d9ea 100644
--- a/ui/wm/wm.gyp
+++ b/ui/wm/wm.gyp
@@ -10,7 +10,14 @@
     {
       'target_name': 'wm_public',
       'type': 'static_library',
+      'dependencies': [
+        '../../skia/skia.gyp:skia',
+        '../aura/aura.gyp:aura',
+        '../gfx/gfx.gyp:gfx_geometry',
+      ],
       'sources': [
+        'core/easy_resize_window_targeter.cc',
+        'public/easy_resize_window_targeter.h',
         'public/window_types.h',
       ],
     },
@@ -20,7 +27,6 @@
       'dependencies': [
         '../../skia/skia.gyp:skia',
         '../aura/aura.gyp:aura',
-        '../views/views.gyp:views',
       ],
       'sources': [
         'test/wm_test_helper.cc',