mojo/examples/keyboard/keyboard_view.h

   1 // Copyright 2014 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 MOJO_EXAMPLES_KEYBOARD_KEYBOARD_VIEW_H_
   6 #define MOJO_EXAMPLES_KEYBOARD_KEYBOARD_VIEW_H_
   7
   8 #include <vector>
   9
  10 #include "base/macros.h"
  11 #include "ui/gfx/font_list.h"
  12 #include "ui/views/controls/button/button.h"
  13 #include "ui/views/view.h"
  14
  15 namespace views {
  16 class LabelButton;
  17 }
  18
  19 namespace mojo {
  20 namespace examples {
  21
  22 class KeyboardDelegate;
  23 struct Key;
  24 struct Row;
  25
  26 // Shows a keyboard the user can interact with. The delegate is notified any
  27 // time the user presses a button.
  28 class KeyboardView : public views::View, public views::ButtonListener {
  29  public:
  30   explicit KeyboardView(KeyboardDelegate* delegate);
  31   virtual ~KeyboardView();
  32
  33   // views::View:
  34   virtual void Layout() override;
  35
  36  private:
  37   // The type of keys that are shown.
  38   enum KeyboardLayout {
  39     KEYBOARD_LAYOUT_ALPHA,
  40
  41     // Uppercase characters.
  42     KEYBOARD_LAYOUT_SHIFT,
  43
  44     // Numeric characters.
  45     KEYBOARD_LAYOUT_NUMERIC,
  46   };
  47
  48   int event_flags() const {
  49     return (keyboard_layout_ == KEYBOARD_LAYOUT_SHIFT) ?
  50       ui::EF_SHIFT_DOWN : ui::EF_NONE;
  51   }
  52
  53   void SetLayout(KeyboardLayout layout);
  54
  55   // Lays out the buttons for the specified row.
  56   void LayoutRow(const Row& row,
  57                  int row_index,
  58                  int initial_x,
  59                  int button_width,
  60                  int button_height);
  61
  62   // Sets the rows to show.
  63   void SetRows(const std::vector<const Row*>& rows);
  64
  65   // Configures the button in a row.
  66   void ConfigureButtonsInRow(int row_index, const Row& row);
  67
  68   // Creates a new button.
  69   views::View* CreateButton();
  70
  71   // Returns the button corresponding to a key at the specified row/column.
  72   views::LabelButton* GetButton(int row, int column);
  73
  74   const Key& GetKeyForButton(views::Button* button) const;
  75
  76   // Reset the fonts of all the buttons. |special_font| is used for the buttons
  77   // that toggle the layout.
  78   void ResetFonts(const gfx::FontList& button_font,
  79                   const gfx::FontList& special_font);
  80
  81   // views::ButtonListener:
  82   virtual void ButtonPressed(views::Button* sender,
  83                              const ui::Event& event) override;
  84
  85   KeyboardDelegate* delegate_;
  86
  87   // Maximium number of keys in a row. Determined from |rows_|.
  88   int max_keys_in_row_;
  89
  90   KeyboardLayout keyboard_layout_;
  91
  92   std::vector<const Row*> rows_;
  93
  94   gfx::Size last_layout_size_;
  95
  96   gfx::FontList button_font_;
  97
  98   DISALLOW_COPY_AND_ASSIGN(KeyboardView);
  99 };
 100
 101 }  // namespace examples
 102 }  // namespace mojo
 103
 104 #endif  // MOJO_EXAMPLES_KEYBOARD_KEYBOARD_VIEW_H_