// 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.

// Next MinVersion: 6

module arc.mojom;

import "screen_rect.mojom";

// Represents the type of text input field currently focused.
[Extensible]
enum TextInputType {
  NONE,
  TEXT,
  PASSWORD,
  SEARCH,
  EMAIL,
  NUMBER,
  TELEPHONE,
  URL,
  DATE,
  TIME,
  DATETIME,
};

// TODO(yhanada): Switch to use gfx.mojom.Rect. See crbug.com/723224.
// Represents the text insertion points in the container screen coordinates.
struct CursorRect {
  int32 left;
  int32 top;
  int32 right;
  int32 bottom;
};

// TODO(yhanada): Switch to use gfx.mojom.Range. See crbug.com/723224.
// Represents the range in the text. It is an open interval [start, end).
[MinVersion=5]
struct TextRange {
  // Start offset in UTF-16 index.
  uint32 start;
  // End offset in UTF-16 index.
  uint32 end;
};

// Represents a single segment of text currently composed by IME.
struct CompositionSegment {
  // Start offset of the segment in UTF-16 index.
  uint32 start_offset;
  // End offset of the segment in UTF-16 index.
  uint32 end_offset;
  // Indicates that this segment should be emphasized.
  bool emphasized;
};

// Next method ID: 4
interface ImeHost {
  // Notifies Chrome that the text input focus is changed.
  OnTextInputTypeChanged@0(TextInputType type);

  // Notifies Chrome that the cursor poisition has changed.
  OnCursorRectChanged@1(CursorRect rect);

  // Notifies Chrome that the current composition is canceled.
  [MinVersion=1] OnCancelComposition@2();

  // Show virtual keyboard of Chrome OS if needed.
  [MinVersion=2] ShowImeIfNeeded@3();

  // Notifies Chrome that the cursor position has changed and
  // also sends surrounding text.
  //
  // |text_range|, |text_in_range| and |selection_range| are piggy-backed
  // into this method because Chrome OS IME tries to retrieve these information
  // synchronously, so we need to update them all at once to keep consistency.
  [MinVersion=5] OnCursorRectChangedWithSurroundingText@4(
      CursorRect rect,           // The cursor position.
      TextRange text_range,      // The range of |text_in_range| in the current
                                 // text in the editor.
      string text_in_range,      // The text around the cursor.
      TextRange selection_range  // The range of the selected text
                                 // in the current text in the editor.
      );
};

// Next method ID: 6
interface ImeInstance {
  Init@0(ImeHost host_ptr);

  // Sets composition text and attributes requested by the host IME.
  SetCompositionText@1(string text, array<CompositionSegment> segments);

  // Commits the last set composition text and clears the composition.
  ConfirmCompositionText@2();

  // Commits the specified text and clears the composition.
  InsertText@3(string text);

  // Informs the virtual keyboard bounds on screen is changing.
  // |new_bounds| Represents a ChromeOS virtual keyboard bounds in ChromeOS
  // screen coordinate, physical pixel as a unit.
  // When all members are zero value, virtual keyboard is being hidden.
  [MinVersion=3] OnKeyboardBoundsChanging@4(ScreenRect new_bounds);

  // Deletes current selection plus the specified number of char16 values
  // before and after selection or caret.
  [MinVersion=4] ExtendSelectionAndDelete@5(uint64 before, uint64 after);
};