1 files changed, 78 insertions, 0 deletions
diff --git a/chromium/ash/shelf/shelf_bezel_event_filter.cc b/chromium/ash/shelf/shelf_bezel_event_filter.cc
new file mode 100644
index 00000000000..2c4f6485cd4
--- /dev/null
+++ b/chromium/ash/shelf/shelf_bezel_event_filter.cc
@@ -0,0 +1,78 @@
+// Copyright 2013 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/shelf/shelf_bezel_event_filter.h"
+
+#include "ash/shelf/shelf_layout_manager.h"
+#include "ash/shell.h"
+#include "ash/wm/coordinate_conversion.h"
+#include "ui/aura/window.h"
+
+namespace ash {
+namespace internal {
+
+ShelfBezelEventFilter::ShelfBezelEventFilter(
+    ShelfLayoutManager* shelf)
+    : shelf_(shelf),
+      in_touch_drag_(false) {
+  Shell::GetInstance()->AddPreTargetHandler(this);
+}
+
+ShelfBezelEventFilter::~ShelfBezelEventFilter() {
+  Shell::GetInstance()->RemovePreTargetHandler(this);
+}
+
+void ShelfBezelEventFilter::OnGestureEvent(
+    ui::GestureEvent* event) {
+  gfx::Point point_in_screen(event->location());
+  aura::Window* target = static_cast<aura::Window*>(event->target());
+  wm::ConvertPointToScreen(target, &point_in_screen);
+  gfx::Rect screen =
+      Shell::GetScreen()->GetDisplayNearestPoint(point_in_screen).bounds();
+  if ((!screen.Contains(point_in_screen) &&
+       IsShelfOnBezel(screen, point_in_screen)) ||
+      in_touch_drag_) {
+    if (gesture_handler_.ProcessGestureEvent(*event)) {
+      switch (event->type()) {
+        case ui::ET_GESTURE_SCROLL_BEGIN:
+          in_touch_drag_ = true;
+          break;
+        case ui::ET_GESTURE_SCROLL_END:
+        case ui::ET_SCROLL_FLING_START:
+          in_touch_drag_ = false;
+          break;
+        default:
+          break;
+      }
+      event->StopPropagation();
+    }
+  }
+}
+
+bool ShelfBezelEventFilter::IsShelfOnBezel(
+    const gfx::Rect& screen,
+    const gfx::Point& point) const{
+  switch (shelf_->GetAlignment()) {
+    case SHELF_ALIGNMENT_BOTTOM:
+      if (point.y() >= screen.bottom())
+        return true;
+      break;
+    case SHELF_ALIGNMENT_LEFT:
+      if (point.x() <= screen.x())
+        return true;
+      break;
+    case SHELF_ALIGNMENT_TOP:
+      if (point.y() <= screen.y())
+        return true;
+      break;
+    case SHELF_ALIGNMENT_RIGHT:
+      if (point.x() >= screen.right())
+        return true;
+      break;
+  }
+  return false;
+}
+
+}  // namespace internal
+}  // namespace ash