[vr] Clicking on the security icon should prompt the user to bail out of VR

chrome/browser/android/vr_shell/ui_elements/exit_prompt.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/exit_prompt.h"
+
+#include "base/memory/ptr_util.h"
+#include "chrome/browser/android/vr_shell/textures/exit_prompt_texture.h"
+
+namespace vr_shell {
+
+ExitPrompt::ExitPrompt(int preferred_width,
+                       const base::Callback<void()>& primary_button_callback,
+                       const base::Callback<void()>& secondary_buttton_callback)
+    : TexturedElement(preferred_width),
+      texture_(base::MakeUnique<ExitPromptTexture>()),
+      primary_button_callback_(primary_button_callback),
+      secondary_buttton_callback_(secondary_buttton_callback) {}
+
+ExitPrompt::~ExitPrompt() = default;
+
+void ExitPrompt::OnHoverEnter(const gfx::PointF& position) {
+  OnStateUpdated(position);
+}
+
+void ExitPrompt::OnHoverLeave() {
+  OnStateUpdated(gfx::PointF(std::numeric_limits<float>::max(),
+                             std::numeric_limits<float>::max()));
+}
+
+void ExitPrompt::OnMove(const gfx::PointF& position) {
+  OnStateUpdated(position);
+}
+
+void ExitPrompt::OnButtonDown(const gfx::PointF& position) {
+  if (texture_->HitsPrimaryButton(position))
+    primary_down_ = true;
+  else if (texture_->HitsSecondaryButton(position))
+    secondary_down_ = true;
+  OnStateUpdated(position);
+}
+
+void ExitPrompt::OnButtonUp(const gfx::PointF& position) {
+  primary_down_ = false;
+  secondary_down_ = false;
+
+  OnStateUpdated(position);
+  if (texture_->HitsPrimaryButton(position))

[cjgrant, 2017/06/02 04:16:36]

Don't we want to check that a particular button is down, before running its
callback?  We need to make sure that a click started and stopped on a button,
even if the reticle moved off and back on while clicked, right?

[ymalik, 2017/06/02 21:14:31]

Yeah totally. Fixed. 

+    primary_button_callback_.Run();
+  else if (texture_->HitsSecondaryButton(position))
+    secondary_buttton_callback_.Run();
+}
+
+void ExitPrompt::OnStateUpdated(const gfx::PointF& position) {
+  const bool primary_hovered = texture_->HitsPrimaryButton(position);
+  const bool secondary_hovered = texture_->HitsSecondaryButton(position);
+
+  texture_->SetPrimaryHovered(primary_hovered);
+  texture_->SetPrimaryPressed(primary_hovered ? primary_down_ : false);
+  texture_->SetSecondaryHovered(secondary_hovered);
+  texture_->SetSecondaryPressed(secondary_hovered ? secondary_down_ : false);
+  UpdateTexture();
+}
+
+UiTexture* ExitPrompt::GetTexture() const {
+  return texture_.get();
+}
+
+}  // namespace vr_shell