Expose all reusable task manager view code so it can be used by Mac

chrome/browser/ui/task_manager/task_manager_table_model.h

+// 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.
+
+#ifndef CHROME_BROWSER_UI_TASK_MANAGER_TASK_MANAGER_TABLE_MODEL_H_
+#define CHROME_BROWSER_UI_TASK_MANAGER_TASK_MANAGER_TABLE_MODEL_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+#include "chrome/browser/task_management/task_manager_observer.h"
+#include "ui/base/models/table_model.h"
+
+namespace task_management {
+
+class TaskManagerValuesStringifier;
+
+// Describes how the platform specific table view is sorted.
+struct TableSortDescriptor {
+  TableSortDescriptor();
+  TableSortDescriptor(int col_id, bool ascending);
+
+  // The ID of the sorted column, -1 if the table is not sorted.
+  int sorted_column_id;
+
+  // True if the column is sorted ascending.
+  bool is_ascending;
+};
+
+// An interface to be able to communicate with the platform-specific table view
+// (Either views::TableView or NSTableView on the Mac).
+class TableViewDelegate {
+ public:
+  TableViewDelegate() {}
+  virtual ~TableViewDelegate() {}
+
+  virtual bool IsColumnVisible(int column_id) const = 0;
+
+  virtual void SetColumnVisibility(int column_id, bool new_visibility) = 0;
+
+  virtual bool IsTableSorted() const = 0;
+
+  virtual TableSortDescriptor GetSortDescriptor() const = 0;
+
+  // As the name of |visible_column_index| implies, it must by the index of the
+  // column in the visible columns array.
+  virtual void ToggleSortOrder(int visible_column_index) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TableViewDelegate);
+};
+
+class TaskManagerTableModel
+    : public TaskManagerObserver,
+      public ui::TableModel {
+ public:
+  TaskManagerTableModel(int64 refresh_flags, TableViewDelegate* delegate);

[Lei Zhang, 2015/09/24 05:33:58]

int64_t (see comments in base/basictypes.h) Also in task_manager_table_model.cc.

[afakhry, 2015/09/25 16:39:49]

Done here! Though I should send a follow-up CL after this to change all the
int64's under c/b/task_management to int64_t's.

+  ~TaskManagerTableModel() override;
+
+  // ui::TableModel:
+  int RowCount() override;
+  base::string16 GetText(int row, int column) override;
+  gfx::ImageSkia GetIcon(int row) override;
+  void SetObserver(ui::TableModelObserver* observer) override;
+  int CompareValues(int row1, int row2, int column_id) override;
+
+  // task_management::TaskManagerObserver:
+  void OnTaskAdded(TaskId id) override;
+  void OnTaskToBeRemoved(TaskId id) override;
+  void OnTasksRefreshed(const TaskIdList& task_ids) override;
+
+  // Gets the start index and length of the group to which the task at
+  // |row_index| belongs.
+  void GetRowsGroupRange(int row_index, int* out_start, int* out_length);
+
+  // Start / stop observing the task manager.
+  void StartUpdating();
+  void StopUpdating();
+
+  // Activates the browser tab associated with the process in the specified
+  // |row_index|.
+  void ActivateTask(int row_index);
+
+  // Kills the process on which the task at |row_index| is running.
+  void KillTask(int row_index);
+
+  // Based on the given |visibility| and the |column_id|, a particular refresh
+  // type will be enabled or disabled.
+  void UpdateRefreshTypes(int column_id, bool visibility);
+

[Lei Zhang, 2015/09/24 05:33:58]

nit: extra blank line

[afakhry, 2015/09/25 16:39:49]

Done.

+
+  // Checks if the task at |row_index| is running on the browser process.
+  bool IsBrowserProcess(int row_index) const;
+
+  // Restores the saved columns settings from a previous session into
+  // |columns_settings_| and updates the table view.
+  void RetrieveSavedColumnsSettingsAndUpdateTable();
+
+  // Stores the current values in |column_settings_| to the user prefs so that
+  // it can be restored later next time the task manager view is opened.
+  void StoreColumnsSettings();
+
+  void ToggleColumnVisibility(int column_id);
+
+ private:
+  void OnRefresh();
+
+  // Checks whether the task at |row_index| is the first task in its process
+  // group of tasks.
+  bool IsTaskFirstInGroup(int row_index) const;
+
+  // The delegate that will be used to communicate with the platform-specific
+  // TableView.
+  TableViewDelegate* table_view_delegate_;
+
+  // Contains either the column settings retrieved from user preferences if it
+  // exists, or the default column settings.
+  // The columns settings are the visible columns and the last sorted column
+  // and the direction of the sort.
+  scoped_ptr<base::DictionaryValue> columns_settings_;
+
+  // The table model observer that will be set by the table view of the task
+  // manager.
+  ui::TableModelObserver* table_model_observer_;
+
+  // The sorted list of task IDs by process ID then by task ID.
+  std::vector<TaskId> tasks_;
+
+  // The owned task manager values stringifier that will be used to convert the
+  // values to string16.
+  scoped_ptr<TaskManagerValuesStringifier> stringifier_;
+
+  DISALLOW_COPY_AND_ASSIGN(TaskManagerTableModel);
+};
+
+}  // namespace task_management
+
+#endif  // CHROME_BROWSER_UI_TASK_MANAGER_TASK_MANAGER_TABLE_MODEL_H_