examples/ui/tile/tile_view.cc - mojo-tools - Git at Google

 // 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 "examples/ui/tile/tile_view.h"
 #include "mojo/services/geometry/cpp/geometry_util.h"

 namespace examples {

 namespace {
 constexpr uint32_t kViewResourceIdBase = 100;
 constexpr uint32_t kViewResourceIdSpacing = 100;

 constexpr uint32_t kRootNodeId = mojo::gfx::composition::kSceneRootNodeId;
 constexpr uint32_t kViewNodeIdBase = 100;
 constexpr uint32_t kViewNodeIdSpacing = 100;
 constexpr uint32_t kViewSceneNodeIdOffset = 1;
 constexpr uint32_t kViewFallbackNodeIdOffset = 2;
 }  // namespace

 TileView::TileView(
     mojo::ApplicationImpl* app_impl,
     mojo::InterfaceRequest<mojo::ui::ViewOwner> view_owner_request,
     const std::vector<std::string>& view_urls)
     : BaseView(app_impl, view_owner_request.Pass(), "Tile"),
       view_urls_(view_urls) {
   ConnectViews();
 }

 TileView::~TileView() {}

 void TileView::ConnectViews() {
   uint32_t child_key = 0;
   for (const auto& url : view_urls_) {
     // Start connecting to the view provider.
     mojo::ui::ViewProviderPtr provider;
     app_impl()->ConnectToService(url, &provider);

     LOG(INFO) << "Connecting to view: child_key=" << child_key
               << ", url=" << url;
     mojo::ui::ViewOwnerPtr child_view_owner;
     provider->CreateView(mojo::GetProxy(&child_view_owner), nullptr, nullptr);

     view()->AddChild(child_key, child_view_owner.Pass());
     views_.emplace(std::make_pair(
         child_key, std::unique_ptr<ViewData>(new ViewData(url, child_key))));

     child_key++;
   }
 }

 void TileView::OnChildUnavailable(uint32_t child_key,
                                   const OnChildUnavailableCallback& callback) {
   auto it = views_.find(child_key);
   DCHECK(it != views_.end());
   LOG(ERROR) << "View died unexpectedly: child_key=" << child_key
              << ", url=" << it->second->url;

   std::unique_ptr<ViewData> view_data = std::move(it->second);
   views_.erase(it);

   view()->RemoveChild(child_key, nullptr);

   if (view_data->layout_pending) {
     DCHECK(pending_child_layout_count_);
     pending_child_layout_count_--;
     FinishLayout();
   }

   callback.Run();
 }

 void TileView::OnLayout(mojo::ui::ViewLayoutParamsPtr layout_params,
                         mojo::Array<uint32_t> children_needing_layout,
                         const OnLayoutCallback& callback) {
   size_.width = layout_params->constraints->max_width;
   size_.height = layout_params->constraints->max_height;

   // Wipe out cached layout information for children needing layout.
   for (uint32_t child_key : children_needing_layout) {
     auto view_it = views_.find(child_key);
     if (view_it != views_.end())
       view_it->second->layout_info.reset();
   }

   // Layout all children in a row.
   if (!views_.empty()) {
     uint32_t index = 0;
     uint32_t base_width = size_.width / views_.size();
     uint32_t excess_width = size_.width % views_.size();
     uint32_t x = 0;
     for (auto it = views_.begin(); it != views_.end(); ++it, ++index) {
       ViewData* view_data = it->second.get();
       DCHECK(!view_data->layout_pending);

       // Distribute any excess width among the leading children.
       uint32_t child_width = base_width;
       if (excess_width) {
         child_width++;
         excess_width--;
       }
       uint32_t child_height = size_.height;
       uint32_t child_x = x;
       x += child_width;

       view_data->layout_bounds.x = child_x;
       view_data->layout_bounds.y = 0;
       view_data->layout_bounds.width = child_width;
       view_data->layout_bounds.height = child_height;

       mojo::ui::ViewLayoutParamsPtr params = mojo::ui::ViewLayoutParams::New();
       params->constraints = mojo::ui::BoxConstraints::New();
       params->constraints->min_width = child_width;
       params->constraints->max_width = child_width;
       params->constraints->min_height = child_height;
       params->constraints->max_height = child_height;
       params->device_pixel_ratio = layout_params->device_pixel_ratio;

       if (view_data->layout_info && view_data->layout_params.Equals(params))
         continue;  // no layout work to do

       pending_child_layout_count_++;
       view_data->layout_pending = true;
       view_data->layout_params = params.Clone();
       view_data->layout_info.reset();

       view()->LayoutChild(it->first, params.Pass(),
                           base::Bind(&TileView::OnChildLayoutFinished,
                                      base::Unretained(this), it->first));
     }
   }

   // Store the callback until layout of all children is finished.
   pending_layout_callback_ = callback;
   FinishLayout();
 }

 void TileView::OnChildLayoutFinished(
     uint32_t child_key,
     mojo::ui::ViewLayoutInfoPtr child_layout_info) {
   auto it = views_.find(child_key);
   if (it != views_.end()) {
     ViewData* view_data = it->second.get();
     DCHECK(view_data->layout_pending);
     DCHECK(pending_child_layout_count_);
     pending_child_layout_count_--;
     view_data->layout_pending = false;
     view_data->layout_info = child_layout_info.Pass();
     FinishLayout();
   }
 }

 void TileView::FinishLayout() {
   if (pending_layout_callback_.is_null())
     return;

   // Wait until all children have laid out.
   // TODO(jeffbrown): There should be a timeout on this.
   if (pending_child_layout_count_)
     return;

   // Update the scene.
   // TODO: only send the resources once, be more incremental
   auto update = mojo::gfx::composition::SceneUpdate::New();

   // Create the root node.
   auto root_node = mojo::gfx::composition::Node::New();

   // Add the children.
   for (auto it = views_.cbegin(); it != views_.cend(); it++) {
     const ViewData& view_data = *(it->second.get());
     const uint32_t scene_resource_id =
         kViewResourceIdBase + view_data.key * kViewResourceIdSpacing;
     const uint32_t container_node_id =
         kViewNodeIdBase + view_data.key * kViewNodeIdSpacing;
     const uint32_t scene_node_id = container_node_id + kViewSceneNodeIdOffset;
     const uint32_t fallback_node_id =
         container_node_id + kViewFallbackNodeIdOffset;

     mojo::Rect extent;
     extent.width = view_data.layout_bounds.width;
     extent.height = view_data.layout_bounds.height;

     // Create a container to represent the place where the child view
     // will be presented.  The children of the container provide
     // fallback behavior in case the view is not available.
     auto container_node = mojo::gfx::composition::Node::New();
     container_node->content_clip = extent.Clone();
     container_node->content_transform = mojo::Transform::New();
     SetTranslationTransform(container_node->content_transform.get(),
                             view_data.layout_bounds.x,
                             view_data.layout_bounds.y, 0.f);
     container_node->combinator =
         mojo::gfx::composition::Node::Combinator::FALLBACK;

     // If we have the view, add it to the scene.
     if (view_data.layout_info) {
       auto scene_resource = mojo::gfx::composition::Resource::New();
       scene_resource->set_scene(mojo::gfx::composition::SceneResource::New());
       scene_resource->get_scene()->scene_token =
           view_data.layout_info->scene_token.Clone();
       update->resources.insert(scene_resource_id, scene_resource.Pass());

       auto scene_node = mojo::gfx::composition::Node::New();
       scene_node->op = mojo::gfx::composition::NodeOp::New();
       scene_node->op->set_scene(mojo::gfx::composition::SceneNodeOp::New());
       scene_node->op->get_scene()->scene_resource_id = scene_resource_id;
       update->nodes.insert(scene_node_id, scene_node.Pass());
       container_node->child_node_ids.push_back(scene_node_id);
     } else {
       update->resources.insert(fallback_node_id, nullptr);
       update->nodes.insert(scene_node_id, nullptr);
     }

     // Add the fallback content.
     auto fallback_node = mojo::gfx::composition::Node::New();
     fallback_node->op = mojo::gfx::composition::NodeOp::New();
     fallback_node->op->set_rect(mojo::gfx::composition::RectNodeOp::New());
     fallback_node->op->get_rect()->content_rect = extent.Clone();
     fallback_node->op->get_rect()->color = mojo::gfx::composition::Color::New();
     fallback_node->op->get_rect()->color->red = 255;
     fallback_node->op->get_rect()->color->alpha = 255;
     update->nodes.insert(fallback_node_id, fallback_node.Pass());
     container_node->child_node_ids.push_back(fallback_node_id);

     // Add the container.
     update->nodes.insert(container_node_id, container_node.Pass());
     root_node->child_node_ids.push_back(container_node_id);
   }

   // Add the root node.
   update->nodes.insert(kRootNodeId, root_node.Pass());

   // Publish the scene.
   scene()->Update(update.Pass());
   scene()->Publish(nullptr);

   // Submit the new layout information.
   auto info = mojo::ui::ViewLayoutResult::New();
   info->size = size_.Clone();
   pending_layout_callback_.Run(info.Pass());
   pending_layout_callback_.reset();
 }

 TileView::ViewData::ViewData(const std::string& url, uint32_t key)
     : url(url), key(key), layout_pending(false) {}

 TileView::ViewData::~ViewData() {}

 }  // namespace examples
	// 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 "examples/ui/tile/tile_view.h"
	#include "mojo/services/geometry/cpp/geometry_util.h"

	namespace examples {

	namespace {
	constexpr uint32_t kViewResourceIdBase = 100;
	constexpr uint32_t kViewResourceIdSpacing = 100;

	constexpr uint32_t kRootNodeId = mojo::gfx::composition::kSceneRootNodeId;
	constexpr uint32_t kViewNodeIdBase = 100;
	constexpr uint32_t kViewNodeIdSpacing = 100;
	constexpr uint32_t kViewSceneNodeIdOffset = 1;
	constexpr uint32_t kViewFallbackNodeIdOffset = 2;
	} // namespace

	TileView::TileView(
	mojo::ApplicationImpl* app_impl,
	mojo::InterfaceRequest<mojo::ui::ViewOwner> view_owner_request,
	const std::vector<std::string>& view_urls)
	: BaseView(app_impl, view_owner_request.Pass(), "Tile"),
	view_urls_(view_urls) {
	ConnectViews();
	}

	TileView::~TileView() {}

	void TileView::ConnectViews() {
	uint32_t child_key = 0;
	for (const auto& url : view_urls_) {
	// Start connecting to the view provider.
	mojo::ui::ViewProviderPtr provider;
	app_impl()->ConnectToService(url, &provider);

	LOG(INFO) << "Connecting to view: child_key=" << child_key
	<< ", url=" << url;
	mojo::ui::ViewOwnerPtr child_view_owner;
	provider->CreateView(mojo::GetProxy(&child_view_owner), nullptr, nullptr);

	view()->AddChild(child_key, child_view_owner.Pass());
	views_.emplace(std::make_pair(
	child_key, std::unique_ptr<ViewData>(new ViewData(url, child_key))));

	child_key++;
	}
	}

	void TileView::OnChildUnavailable(uint32_t child_key,
	const OnChildUnavailableCallback& callback) {
	auto it = views_.find(child_key);
	DCHECK(it != views_.end());
	LOG(ERROR) << "View died unexpectedly: child_key=" << child_key
	<< ", url=" << it->second->url;

	std::unique_ptr<ViewData> view_data = std::move(it->second);
	views_.erase(it);

	view()->RemoveChild(child_key, nullptr);

	if (view_data->layout_pending) {
	DCHECK(pending_child_layout_count_);
	pending_child_layout_count_--;
	FinishLayout();
	}

	callback.Run();
	}

	void TileView::OnLayout(mojo::ui::ViewLayoutParamsPtr layout_params,
	mojo::Array<uint32_t> children_needing_layout,
	const OnLayoutCallback& callback) {
	size_.width = layout_params->constraints->max_width;
	size_.height = layout_params->constraints->max_height;

	// Wipe out cached layout information for children needing layout.
	for (uint32_t child_key : children_needing_layout) {
	auto view_it = views_.find(child_key);
	if (view_it != views_.end())
	view_it->second->layout_info.reset();
	}

	// Layout all children in a row.
	if (!views_.empty()) {
	uint32_t index = 0;
	uint32_t base_width = size_.width / views_.size();
	uint32_t excess_width = size_.width % views_.size();
	uint32_t x = 0;
	for (auto it = views_.begin(); it != views_.end(); ++it, ++index) {
	ViewData* view_data = it->second.get();
	DCHECK(!view_data->layout_pending);

	// Distribute any excess width among the leading children.
	uint32_t child_width = base_width;
	if (excess_width) {
	child_width++;
	excess_width--;
	}
	uint32_t child_height = size_.height;
	uint32_t child_x = x;
	x += child_width;

	view_data->layout_bounds.x = child_x;
	view_data->layout_bounds.y = 0;
	view_data->layout_bounds.width = child_width;
	view_data->layout_bounds.height = child_height;

	mojo::ui::ViewLayoutParamsPtr params = mojo::ui::ViewLayoutParams::New();
	params->constraints = mojo::ui::BoxConstraints::New();
	params->constraints->min_width = child_width;
	params->constraints->max_width = child_width;
	params->constraints->min_height = child_height;
	params->constraints->max_height = child_height;
	params->device_pixel_ratio = layout_params->device_pixel_ratio;

	if (view_data->layout_info && view_data->layout_params.Equals(params))
	continue; // no layout work to do

	pending_child_layout_count_++;
	view_data->layout_pending = true;
	view_data->layout_params = params.Clone();
	view_data->layout_info.reset();

	view()->LayoutChild(it->first, params.Pass(),
	base::Bind(&TileView::OnChildLayoutFinished,
	base::Unretained(this), it->first));
	}
	}

	// Store the callback until layout of all children is finished.
	pending_layout_callback_ = callback;
	FinishLayout();
	}

	void TileView::OnChildLayoutFinished(
	uint32_t child_key,
	mojo::ui::ViewLayoutInfoPtr child_layout_info) {
	auto it = views_.find(child_key);
	if (it != views_.end()) {
	ViewData* view_data = it->second.get();
	DCHECK(view_data->layout_pending);
	DCHECK(pending_child_layout_count_);
	pending_child_layout_count_--;
	view_data->layout_pending = false;
	view_data->layout_info = child_layout_info.Pass();
	FinishLayout();
	}
	}

	void TileView::FinishLayout() {
	if (pending_layout_callback_.is_null())
	return;

	// Wait until all children have laid out.
	// TODO(jeffbrown): There should be a timeout on this.
	if (pending_child_layout_count_)
	return;

	// Update the scene.
	// TODO: only send the resources once, be more incremental
	auto update = mojo::gfx::composition::SceneUpdate::New();

	// Create the root node.
	auto root_node = mojo::gfx::composition::Node::New();

	// Add the children.
	for (auto it = views_.cbegin(); it != views_.cend(); it++) {
	const ViewData& view_data = *(it->second.get());
	const uint32_t scene_resource_id =
	kViewResourceIdBase + view_data.key * kViewResourceIdSpacing;
	const uint32_t container_node_id =
	kViewNodeIdBase + view_data.key * kViewNodeIdSpacing;
	const uint32_t scene_node_id = container_node_id + kViewSceneNodeIdOffset;
	const uint32_t fallback_node_id =
	container_node_id + kViewFallbackNodeIdOffset;

	mojo::Rect extent;
	extent.width = view_data.layout_bounds.width;
	extent.height = view_data.layout_bounds.height;

	// Create a container to represent the place where the child view
	// will be presented. The children of the container provide
	// fallback behavior in case the view is not available.
	auto container_node = mojo::gfx::composition::Node::New();
	container_node->content_clip = extent.Clone();
	container_node->content_transform = mojo::Transform::New();
	SetTranslationTransform(container_node->content_transform.get(),
	view_data.layout_bounds.x,
	view_data.layout_bounds.y, 0.f);
	container_node->combinator =
	mojo::gfx::composition::Node::Combinator::FALLBACK;

	// If we have the view, add it to the scene.
	if (view_data.layout_info) {
	auto scene_resource = mojo::gfx::composition::Resource::New();
	scene_resource->set_scene(mojo::gfx::composition::SceneResource::New());
	scene_resource->get_scene()->scene_token =
	view_data.layout_info->scene_token.Clone();
	update->resources.insert(scene_resource_id, scene_resource.Pass());

	auto scene_node = mojo::gfx::composition::Node::New();
	scene_node->op = mojo::gfx::composition::NodeOp::New();
	scene_node->op->set_scene(mojo::gfx::composition::SceneNodeOp::New());
	scene_node->op->get_scene()->scene_resource_id = scene_resource_id;
	update->nodes.insert(scene_node_id, scene_node.Pass());
	container_node->child_node_ids.push_back(scene_node_id);
	} else {
	update->resources.insert(fallback_node_id, nullptr);
	update->nodes.insert(scene_node_id, nullptr);
	}

	// Add the fallback content.
	auto fallback_node = mojo::gfx::composition::Node::New();
	fallback_node->op = mojo::gfx::composition::NodeOp::New();
	fallback_node->op->set_rect(mojo::gfx::composition::RectNodeOp::New());
	fallback_node->op->get_rect()->content_rect = extent.Clone();
	fallback_node->op->get_rect()->color = mojo::gfx::composition::Color::New();
	fallback_node->op->get_rect()->color->red = 255;
	fallback_node->op->get_rect()->color->alpha = 255;
	update->nodes.insert(fallback_node_id, fallback_node.Pass());
	container_node->child_node_ids.push_back(fallback_node_id);

	// Add the container.
	update->nodes.insert(container_node_id, container_node.Pass());
	root_node->child_node_ids.push_back(container_node_id);
	}

	// Add the root node.
	update->nodes.insert(kRootNodeId, root_node.Pass());

	// Publish the scene.
	scene()->Update(update.Pass());
	scene()->Publish(nullptr);

	// Submit the new layout information.
	auto info = mojo::ui::ViewLayoutResult::New();
	info->size = size_.Clone();
	pending_layout_callback_.Run(info.Pass());
	pending_layout_callback_.reset();
	}

	TileView::ViewData::ViewData(const std::string& url, uint32_t key)
	: url(url), key(key), layout_pending(false) {}

	TileView::ViewData::~ViewData() {}

	} // namespace examples