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mojo/services/window_manager/view_targeter.cc

+// 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 "mojo/services/window_manager/view_targeter.h"
+
+#include "mojo/services/window_manager/capture_controller.h"
+#include "mojo/services/window_manager/focus_controller.h"
+#include "mojo/services/window_manager/view_target.h"
+
+namespace window_manager {
+
+ViewTargeter::ViewTargeter() {}
+
+ViewTargeter::~ViewTargeter() {}
+
+ui::EventTarget* ViewTargeter::FindTargetForEvent(ui::EventTarget* root,
+                                                  ui::Event* event) {
+  ViewTarget* view = static_cast<ViewTarget*>(root);
+  ViewTarget* target =
+      event->IsKeyEvent()
+          ? FindTargetForKeyEvent(view, *static_cast<ui::KeyEvent*>(event))
+          : static_cast<ViewTarget*>(
+                EventTargeter::FindTargetForEvent(root, event));
+
+  // TODO(erg): The aura version of this method does a lot of work to handle
+  // dispatching to a target that isn't a child of |view|. For now, punt on
+  // this.
+  DCHECK_EQ(view->GetRoot(), target->GetRoot());
+
+  return target;
+}
+
+ui::EventTarget* ViewTargeter::FindTargetForLocatedEvent(
+    ui::EventTarget* root,
+    ui::LocatedEvent* event) {
+  ViewTarget* view = static_cast<ViewTarget*>(root);
+  if (!view->HasParent()) {
+    ViewTarget* target = FindTargetInRootView(view, *event);
+    if (target) {
+      view->ConvertEventToTarget(target, event);
+      return target;
+    }
+  }
+  return EventTargeter::FindTargetForLocatedEvent(view, event);
+}
+
+bool ViewTargeter::SubtreeCanAcceptEvent(ui::EventTarget* target,
+                                         const ui::LocatedEvent& event) const {
+  ViewTarget* view = static_cast<ViewTarget*>(target);
+
+  if (!view->IsVisible())
+    return false;
+
+  // TODO(erg): We may need to keep track of the parent on ViewTarget, because
+  // we have a check here about
+  // WindowDelegate::ShouldDescendIntoChildForEventHandling().
+
+  // TODO(sky): decide if we really want this. If we do, it should be a public
+  // constant and documented.
+  if (view->view()->shared_properties().count("deliver-events-to-parent"))
+    return false;
+
+  return true;
+}
+
+bool ViewTargeter::EventLocationInsideBounds(
+    ui::EventTarget* target,
+    const ui::LocatedEvent& event) const {
+  ViewTarget* view = static_cast<ViewTarget*>(target);
+  gfx::Point point = event.location();
+  const ViewTarget* parent = view->GetParent();
+  if (parent)
+    ViewTarget::ConvertPointToTarget(parent, view, &point);
+  return gfx::Rect(view->GetBounds().size()).Contains(point);
+}
+
+ViewTarget* ViewTargeter::FindTargetForKeyEvent(ViewTarget* view_target,
+                                                const ui::KeyEvent& key) {
+  FocusController* focus_controller = GetFocusController(view_target->view());
+  if (focus_controller) {
+    mojo::View* focused_view = focus_controller->GetFocusedView();
+    if (focused_view)
+      return ViewTarget::TargetFromView(focused_view);
+  }
+  return view_target;
+}
+
+ViewTarget* ViewTargeter::FindTargetInRootView(ViewTarget* root_view,
+                                               const ui::LocatedEvent& event) {
+  // TODO(erg): This here is important because it resolves
+  // mouse_pressed_handler() in the aura version. This is what makes sure
+  // that a view gets both the mouse down and up.
+
+  CaptureController* capture_controller =
+      GetCaptureController(root_view->view());
+  if (capture_controller) {
+    mojo::View* capture_view = capture_controller->GetCapture();
+    if (capture_view)
+      return ViewTarget::TargetFromView(capture_view);
+  }
+
+  // TODO(erg): There's a whole bunch of junk about handling touch events
+  // here. Handle later.
+
+  return nullptr;
+}
+
+}  // namespace window_manager