Add palette tool/manager.

ash/common/system/chromeos/palette/palette_tool_manager.cc

Index: ash/common/system/chromeos/palette/palette_tool_manager.cc
diff --git a/ash/common/system/chromeos/palette/palette_tool_manager.cc b/ash/common/system/chromeos/palette/palette_tool_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..188cb58f063bf3b7ca66d9bb48720384ea1d20be
--- /dev/null
+++ b/ash/common/system/chromeos/palette/palette_tool_manager.cc
@@ -0,0 +1,123 @@
+// Copyright 2016 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 "ash/common/system/chromeos/palette/palette_tool_manager.h"
+
+#include <algorithm>
+
+#include "ash/common/system/chromeos/palette/palette_tool.h"
+#include "base/bind.h"
+#include "ui/gfx/vector_icons_public.h"
+
+namespace ash {
+
+PaletteToolManager::PaletteToolManager(Delegate* delegate)
+    : delegate_(delegate) {
+  DCHECK(delegate_);
+}
+
+PaletteToolManager::~PaletteToolManager() {}
+
+void PaletteToolManager::AddTool(std::unique_ptr<PaletteTool> tool) {
+  // The same PaletteToolId cannot be registered twice.
+  DCHECK_EQ(0, std::count_if(tools_.begin(), tools_.end(),
+                             [&tool](const std::unique_ptr<PaletteTool>& t) {
+                               return t->GetToolId() == tool->GetToolId();
+                             }));
+
+  tools_.emplace_back(std::move(tool));
+}
+
+void PaletteToolManager::ActivateTool(PaletteToolId tool_id) {
+  PaletteTool* new_tool = FindToolById(tool_id);
+  DCHECK(new_tool);
+
+  PaletteTool* previous_tool = active_tools_[new_tool->GetGroup()];
+
+  if (new_tool == previous_tool)
+    return;
+
+  if (previous_tool)
+    previous_tool->OnDisable();
+
+  active_tools_[new_tool->GetGroup()] = new_tool;
+  new_tool->OnEnable();
+
+  delegate_->OnActiveToolChanged();
+}
+
+void PaletteToolManager::DeactivateTool(PaletteToolId tool_id) {
+  PaletteTool* tool = FindToolById(tool_id);
+  DCHECK(tool);
+
+  active_tools_[tool->GetGroup()] = nullptr;
+  tool->OnDisable();
+
+  delegate_->OnActiveToolChanged();
+}
+
+bool PaletteToolManager::IsToolActive(PaletteToolId tool_id) {
+  PaletteTool* tool = FindToolById(tool_id);
+  DCHECK(tool);
+
+  return active_tools_[tool->GetGroup()] == tool;
+}
+
+PaletteToolId PaletteToolManager::GetActiveTool(PaletteGroup group) {
+  PaletteTool* active_tool = active_tools_[group];
+  return active_tool ? active_tool->GetToolId() : PaletteToolId::NONE;
+}
+
+gfx::VectorIconId PaletteToolManager::GetActiveTrayIcon(PaletteToolId tool_id) {
+  PaletteTool* tool = FindToolById(tool_id);
+  if (!tool)
+    return gfx::VectorIconId::VECTOR_ICON_NONE;
+
+  return tool->GetActiveTrayIcon();
+}
+
+std::vector<PaletteToolView> PaletteToolManager::CreateViews() {
+  std::vector<PaletteToolView> views(tools_.size());
+
+  for (size_t i = 0; i < tools_.size(); ++i) {
+    PaletteToolView* view = &views[i];
+    view->group = tools_[i]->GetGroup();
+    view->tool_id = tools_[i]->GetToolId();
+    view->view = tools_[i]->CreateView();
+  }
+
+  return views;
+}
+
+void PaletteToolManager::NotifyViewsDestroyed() {
+  for (std::unique_ptr<PaletteTool>& tool : tools_)
+    tool->OnViewDestroyed();
+}
+
+void PaletteToolManager::EnableTool(PaletteToolId tool_id) {
+  ActivateTool(tool_id);
+}
+
+void PaletteToolManager::DisableTool(PaletteToolId tool_id) {
+  DeactivateTool(tool_id);
+}
+
+void PaletteToolManager::HidePalette() {
+  delegate_->HidePalette();
+}
+
+WmWindow* PaletteToolManager::GetWindow() {
+  return delegate_->GetWindow();
+}
+
+PaletteTool* PaletteToolManager::FindToolById(PaletteToolId tool_id) {
+  for (std::unique_ptr<PaletteTool>& tool : tools_) {
+    if (tool->GetToolId() == tool_id)
+      return tool.get();
+  }
+
+  return nullptr;
+}
+
+}  // namespace ash