Refactor VR Shell Input. Locks input to click/scroll targets.

chrome/browser/android/vr_shell/ui_elements/close_button.cc

+// Copyright 2017 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 "chrome/browser/android/vr_shell/ui_elements/close_button.h"
+
+#include "base/memory/ptr_util.h"
+#include "chrome/browser/android/vr_shell/textures/close_button_texture.h"
+
+namespace vr_shell {
+
+CloseButton::CloseButton(base::Callback<void()> click_handler)
+    : TexturedElement(256),
+      texture_(base::MakeUnique<CloseButtonTexture>()),
+      click_handler_(click_handler) {}
+
+CloseButton::~CloseButton() = default;
+
+void CloseButton::OnHoverEnter(gfx::PointF position) {
+  hover_ = true;
+  OnStateUpdated();
+}
+
+void CloseButton::OnHoverLeave() {
+  hover_ = false;
+  OnStateUpdated();
+}
+
+void CloseButton::OnButtonDown(gfx::PointF position) {
+  down_ = true;
+  OnStateUpdated();
+}
+
+void CloseButton::OnButtonUp(gfx::PointF position) {
+  down_ = false;
+  OnStateUpdated();
+  if (position.x() < 0 || position.x() > 1.0f)
+    return;
+  if (position.y() < 0 || position.y() > 1.0f)
+    return;
+  click_handler_.Run();
+}
+
+UiTexture* CloseButton::GetTexture() const {
+  return texture_.get();
+}
+
+void CloseButton::OnStateUpdated() {
+  int flags = hover_ ? CloseButtonTexture::FLAG_HOVER : 0;
+  flags |= (down_ && hover_) ? CloseButtonTexture::FLAG_DOWN : 0;
+  if (!texture_->SetDrawFlags(flags))
+    return;
+  Update();
+}
+
+}  // namespace vr_shell