ui/views/controls/prefix_selector.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_VIEWS_CONTROLS_PREFIX_SELECTOR_H_
   6 #define UI_VIEWS_CONTROLS_PREFIX_SELECTOR_H_
   7
   8 #include "base/strings/string16.h"
   9 #include "base/time/time.h"
  10 #include "ui/base/ime/text_input_client.h"
  11 #include "ui/views/views_export.h"
  12
  13 namespace views {
  14
  15 class PrefixDelegate;
  16
  17 // PrefixSelector is used to change the selection in a view as the user
  18 // types characters.
  19 class VIEWS_EXPORT PrefixSelector : public ui::TextInputClient {
  20  public:
  21   explicit PrefixSelector(PrefixDelegate* delegate);
  22   ~PrefixSelector() override;
  23
  24   // Invoked from the view when it loses focus.
  25   void OnViewBlur();
  26
  27   // ui::TextInputClient:
  28   void SetCompositionText(const ui::CompositionText& composition) override;
  29   void ConfirmCompositionText() override;
  30   void ClearCompositionText() override;
  31   void InsertText(const base::string16& text) override;
  32   void InsertChar(base::char16 ch, int flags) override;
  33   gfx::NativeWindow GetAttachedWindow() const override;
  34   ui::TextInputType GetTextInputType() const override;
  35   ui::TextInputMode GetTextInputMode() const override;
  36   int GetTextInputFlags() const override;
  37   bool CanComposeInline() const override;
  38   gfx::Rect GetCaretBounds() const override;
  39   bool GetCompositionCharacterBounds(uint32 index,
  40                                      gfx::Rect* rect) const override;
  41   bool HasCompositionText() const override;
  42   bool GetTextRange(gfx::Range* range) const override;
  43   bool GetCompositionTextRange(gfx::Range* range) const override;
  44   bool GetSelectionRange(gfx::Range* range) const override;
  45   bool SetSelectionRange(const gfx::Range& range) override;
  46   bool DeleteRange(const gfx::Range& range) override;
  47   bool GetTextFromRange(const gfx::Range& range,
  48                         base::string16* text) const override;
  49   void OnInputMethodChanged() override;
  50   bool ChangeTextDirectionAndLayoutAlignment(
  51       base::i18n::TextDirection direction) override;
  52   void ExtendSelectionAndDelete(size_t before, size_t after) override;
  53   void EnsureCaretInRect(const gfx::Rect& rect) override;
  54   void OnCandidateWindowShown() override;
  55   void OnCandidateWindowUpdated() override;
  56   void OnCandidateWindowHidden() override;
  57
  58   bool IsEditCommandEnabled(int command_id) override;
  59   void SetEditCommandForNextKeyEvent(int command_id) override;
  60
  61  private:
  62   // Invoked when text is typed. Tries to change the selection appropriately.
  63   void OnTextInput(const base::string16& text);
  64
  65   // Returns true if the text of the node at |row| starts with |lower_text|.
  66   bool TextAtRowMatchesText(int row, const base::string16& lower_text);
  67
  68   // Clears |current_text_| and resets |time_of_last_key_|.
  69   void ClearText();
  70
  71   PrefixDelegate* prefix_delegate_;
  72
  73   // Time OnTextInput() was last invoked.
  74   base::TimeTicks time_of_last_key_;
  75
  76   base::string16 current_text_;
  77
  78   DISALLOW_COPY_AND_ASSIGN(PrefixSelector);
  79 };
  80
  81 }  // namespace views
  82
  83 #endif  // UI_VIEWS_CONTROLS_PREFIX_SELECTOR_H_