// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GTK_INPUT_METHOD_CONTEXT_IMPL_GTK_H_
#define UI_GTK_INPUT_METHOD_CONTEXT_IMPL_GTK_H_

#include <string>
#include <vector>

#include "base/memory/raw_ptr.h"
#include "ui/base/glib/glib_integers.h"
#include "ui/base/glib/scoped_gsignal.h"
#include "ui/base/ime/linux/linux_input_method_context.h"
#include "ui/gfx/geometry/rect.h"

using GdkWindow = struct _GdkWindow;
using GtkIMContext = struct _GtkIMContext;
using GtkWidget = struct _GtkWidget;

namespace gtk {

// An implementation of LinuxInputMethodContext which uses GtkIMContext
// (gtk-immodule) as a bridge from/to underlying IMEs.
class InputMethodContextImplGtk : public ui::LinuxInputMethodContext {
 public:
  explicit InputMethodContextImplGtk(
      ui::LinuxInputMethodContextDelegate* delegate);

  InputMethodContextImplGtk(const InputMethodContextImplGtk&) = delete;
  InputMethodContextImplGtk& operator=(const InputMethodContextImplGtk&) =
      delete;

  ~InputMethodContextImplGtk() override;

  // Overridden from ui::LinuxInputMethodContext
  bool DispatchKeyEvent(const ui::KeyEvent& key_event) override;
  bool IsPeekKeyEvent(const ui::KeyEvent& key_event) override;
  void SetCursorLocation(const gfx::Rect& rect) override;
  void Reset() override;
  void UpdateFocus(bool has_client,
                   ui::TextInputType old_type,
                   const TextInputClientAttributes& new_client_attributes,
                   ui::TextInputClient::FocusReason reason) override;
  void SetSurroundingText(const std::u16string& text,
                          const gfx::Range& text_range,
                          const gfx::Range& composition_range,
                          const gfx::Range& selection_range) override;
  ui::VirtualKeyboardController* GetVirtualKeyboardController() override;

 private:
  // GtkIMContext event handlers.  They are shared among |gtk_context_simple_|
  // and |gtk_multicontext_|.
  void OnCommit(GtkIMContext* context, gchar* text);
  void OnPreeditChanged(GtkIMContext* context);
  void OnPreeditEnd(GtkIMContext* context);
  void OnPreeditStart(GtkIMContext* context);

  // Returns the IMContext depending on the currently connected input field
  // type.
  GtkIMContext* GetIMContext();

  // A set of callback functions.  Must not be nullptr.
  const raw_ptr<ui::LinuxInputMethodContextDelegate> delegate_;

  // Tracks the input field type.
  ui::TextInputType type_ = ui::TEXT_INPUT_TYPE_NONE;

  // IME's input GTK context.
  ScopedGObject<GtkIMContext> gtk_context_ = nullptr;
  ScopedGObject<GtkIMContext> gtk_simple_context_ = nullptr;

  // These correspond to the GtkImContexts above.
  raw_ptr<GdkWindow> last_set_client_window_for_gtk_context_ = nullptr;
  raw_ptr<GdkWindow> last_set_client_window_for_gtk_simple_comtext_ = nullptr;

  // Last known caret bounds relative to the screen coordinates, in DIPs.
  // Effective only on non-simple context.
  gfx::Rect last_caret_bounds_;

  std::vector<ScopedGSignal> signals_;
};

}  // namespace gtk

#endif  // UI_GTK_INPUT_METHOD_CONTEXT_IMPL_GTK_H_