mozart: Initial commit of the launcher.

services/ui/launcher/launcher_view_tree.cc

Index: services/ui/launcher/launcher_view_tree.cc
diff --git a/services/ui/launcher/launcher_view_tree.cc b/services/ui/launcher/launcher_view_tree.cc
new file mode 100644
index 0000000000000000000000000000000000000000..052b3c0750e0e0d0965c4eb4cad26029ae4a823f
--- /dev/null
+++ b/services/ui/launcher/launcher_view_tree.cc
@@ -0,0 +1,159 @@
+// Copyright 2015 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 "base/bind.h"
+#include "services/ui/launcher/launcher_view_tree.h"
+
+namespace launcher {
+
+LauncherViewTree::LauncherViewTree(mojo::ApplicationImpl* app_impl,
+                                   mojo::DisplayPtr display,
+                                   mojo::ViewportMetricsPtr viewport_metrics)
+    : display_(display.Pass()),
+      viewport_metrics_(viewport_metrics.Pass()),
+      binding_(this),
+      root_key_(0),
+      frame_scheduled_(false),
+      frame_pending_(false) {
+  app_impl->ConnectToService("mojo:view_manager_service", &view_manager_);
+  view_manager_.set_connection_error_handler(base::Bind(
+      &LauncherViewTree::OnViewManagerConnectionError, base::Unretained(this)));
+
+  mojo::ui::ViewTreePtr view_tree;
+  binding_.Bind(mojo::GetProxy(&view_tree));
+  view_manager_->RegisterViewTree(
+      view_tree.Pass(), mojo::GetProxy(&view_tree_host_),
+      base::Bind(&LauncherViewTree::OnViewTreeRegistered,
+                 base::Unretained(this)));
+
+  ScheduleFrame();
+}
+
+LauncherViewTree::~LauncherViewTree() {}
+
+void LauncherViewTree::SetRoot(mojo::ui::ViewTokenPtr token) {
+  root_ = token.Pass();
+  if (root_)
+    view_tree_host_->SetRoot(++root_key_, root_.Clone());
+  else
+    view_tree_host_->ResetRoot();
+  root_layout_info_.reset();
+}
+
+void LauncherViewTree::SetViewportMetrics(
+    mojo::ViewportMetricsPtr viewport_metrics) {
+  viewport_metrics_ = viewport_metrics.Pass();
+  view_tree_host_->RequestLayout();
+}
+
+void LauncherViewTree::DispatchEvent(mojo::EventPtr event) {
+  // TODO(jeffbrown): Support input dispatch.
+}
+
+void LauncherViewTree::OnViewManagerConnectionError() {
+  LOG(ERROR) << "View manager connection error.";
+}
+
+void LauncherViewTree::OnViewTreeRegistered() {}
+
+void LauncherViewTree::OnLayout(const OnLayoutCallback& callback) {
+  LayoutRoot();
+  callback.Run();
+}
+
+void LauncherViewTree::OnRootUnavailable(
+    uint32_t root_key,
+    const OnRootUnavailableCallback& callback) {
+  if (root_key_ == root_key) {
+    // TODO(jeffbrown): We should probably shut down the launcher.
+    LOG(ERROR) << "Root view terminated unexpectedly.";
+    SetRoot(mojo::ui::ViewTokenPtr());
+  }
+  callback.Run();
+}
+
+void LauncherViewTree::LayoutRoot() {
+  if (!root_)
+    return;
+
+  auto params = mojo::ui::ViewLayoutParams::New();
+  params->constraints = mojo::ui::BoxConstraints::New();
+  params->constraints->min_width = viewport_metrics_->size->width;
+  params->constraints->max_width = viewport_metrics_->size->width;
+  params->constraints->min_height = viewport_metrics_->size->height;
+  params->constraints->max_height = viewport_metrics_->size->height;
+  params->device_pixel_ratio = viewport_metrics_->device_pixel_ratio;
+  view_tree_host_->LayoutRoot(
+      params.Pass(),
+      base::Bind(&LauncherViewTree::OnLayoutResult, base::Unretained(this)));
+}
+
+void LauncherViewTree::OnLayoutResult(mojo::ui::ViewLayoutInfoPtr info) {
+  if (!info) {
+    DVLOG(1) << "Root layout: <stale>";
+    return;
+  }
+
+  DVLOG(1) << "Root layout: size.width=" << info->size->width
+           << ", size.height=" << info->size->height
+           << ", surface_id.id_namespace=" << info->surface_id->id_namespace
+           << ", surface_id.local=" << info->surface_id->local;
+
+  root_layout_info_ = info.Pass();
+  ScheduleFrame();
+}
+
+void LauncherViewTree::ScheduleFrame() {
+  frame_scheduled_ = true;
+  FinishFrame();
+}
+
+void LauncherViewTree::FinishFrame() {
+  if (!frame_scheduled_ || frame_pending_)
+    return;
+  frame_scheduled_ = false;
+
+  mojo::FramePtr frame = mojo::Frame::New();
+  frame->resources.resize(0u);
+
+  mojo::Rect bounds;
+  bounds.width = viewport_metrics_->size->width;
+  bounds.height = viewport_metrics_->size->height;
+  mojo::PassPtr pass = mojo::CreateDefaultPass(1, bounds);
+  pass->shared_quad_states.push_back(
+      mojo::CreateDefaultSQS(*viewport_metrics_->size));
+
+  mojo::QuadPtr quad = mojo::Quad::New();
+  quad->rect = bounds.Clone();
+  quad->opaque_rect = bounds.Clone();
+  quad->visible_rect = bounds.Clone();
+  quad->shared_quad_state_index = 0u;
+
+  if (root_layout_info_) {
+    quad->material = mojo::Material::SURFACE_CONTENT;
+    quad->surface_quad_state = mojo::SurfaceQuadState::New();
+    quad->surface_quad_state->surface = root_layout_info_->surface_id.Clone();
+  } else {
+    quad->material = mojo::Material::SOLID_COLOR;
+    quad->solid_color_quad_state = mojo::SolidColorQuadState::New();
+    quad->solid_color_quad_state->color = mojo::Color::New();
+    quad->solid_color_quad_state->color->rgba = 0xffff0000;
+  }
+
+  pass->quads.push_back(quad.Pass());
+  frame->passes.push_back(pass.Pass());
+
+  frame_pending_ = true;
+  display_->SubmitFrame(
+      frame.Pass(),
+      base::Bind(&LauncherViewTree::OnFrameSubmitted, base::Unretained(this)));
+}
+
+void LauncherViewTree::OnFrameSubmitted() {
+  DCHECK(frame_pending_);
+  frame_pending_ = false;
+  FinishFrame();
+}
+
+}  // namespace launcher