src/mojo/examples/keyboard/keyboard_view.cc

   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 #include "mojo/examples/keyboard/keyboard_view.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/strings/string16.h"
  10 #include "base/strings/utf_string_conversions.h"
  11 #include "mojo/examples/keyboard/keyboard_delegate.h"
  12 #include "mojo/examples/keyboard/keys.h"
  13 #include "ui/events/keycodes/keyboard_code_conversion.h"
  14 #include "ui/events/keycodes/keyboard_codes.h"
  15 #include "ui/gfx/canvas.h"
  16 #include "ui/views/background.h"
  17 #include "ui/views/controls/button/label_button.h"
  18 #include "ui/views/controls/button/label_button_border.h"
  19
  20 namespace mojo {
  21 namespace examples {
  22
  23 namespace {
  24
  25 const int kHorizontalPadding = 6;
  26 const int kVerticalPadding = 8;
  27
  28 base::string16 GetDisplayString(int key_code, int flags) {
  29   return base::string16(1, ui::GetCharacterFromKeyCode(
  30                             static_cast<ui::KeyboardCode>(key_code), flags));
  31 }
  32
  33 // Returns a font that fits in the space provided. |text| is used as a basis
  34 // for determing the size.
  35 gfx::FontList CalculateFont(int width, int height, const base::string16& text) {
  36   gfx::FontList font;
  37   gfx::FontList last_font;
  38   while (gfx::Canvas::GetStringWidth(text, font) < width &&
  39          font.GetHeight() < height) {
  40     last_font = font;
  41     font = font.DeriveWithSizeDelta(2);
  42   }
  43   return last_font;
  44 }
  45
  46 // Returns the total number of keys in |rows|.
  47 int NumKeys(const std::vector<const Row*>& rows) {
  48   int result = 0;
  49   for (size_t i = 0; i < rows.size(); ++i)
  50     result += static_cast<int>(rows[i]->num_keys);
  51   return result;
  52 }
  53
  54 }  // namespace
  55
  56 KeyboardView::KeyboardView(KeyboardDelegate* delegate)
  57     : delegate_(delegate),
  58       max_keys_in_row_(0),
  59       keyboard_layout_(KEYBOARD_LAYOUT_ALPHA) {
  60   set_background(views::Background::CreateSolidBackground(SK_ColorBLACK));
  61   SetRows(GetQWERTYRows());
  62 }
  63
  64 KeyboardView::~KeyboardView() {
  65 }
  66
  67 void KeyboardView::Layout() {
  68   if (width() == 0 || height() == 0 || rows_.empty() ||
  69       last_layout_size_ == bounds().size())
  70     return;
  71
  72   last_layout_size_ = bounds().size();
  73
  74   const int button_width =
  75       (width() - (max_keys_in_row_ - 1) * kHorizontalPadding) /
  76       max_keys_in_row_;
  77   const int button_height =
  78       (height() - (static_cast<int>(rows_.size() - 1) * kVerticalPadding)) /
  79       static_cast<int>(rows_.size());
  80   const int initial_x = (width() - button_width * max_keys_in_row_ -
  81                          kHorizontalPadding * (max_keys_in_row_ - 1)) / 2;
  82   for (size_t i = 0; i < rows_.size(); ++i) {
  83     LayoutRow(*(rows_[i]), static_cast<int>(i), initial_x, button_width,
  84               button_height);
  85   }
  86
  87   views::LabelButtonBorder border(views::Button::STYLE_TEXTBUTTON);
  88   gfx::Insets insets(border.GetInsets());
  89   gfx::FontList font = CalculateFont(button_width - insets.width(),
  90                                      button_height - insets.height(),
  91                                      base::ASCIIToUTF16("W"));
  92   gfx::FontList special_font = CalculateFont(button_width - insets.width(),
  93                                              button_height - insets.height(),
  94                                              base::ASCIIToUTF16("?123"));
  95   button_font_ = font;
  96   ResetFonts(font, special_font);
  97 }
  98
  99 void KeyboardView::SetLayout(KeyboardLayout keyboard_layout) {
 100   if (keyboard_layout_ == keyboard_layout)
 101     return;
 102
 103   keyboard_layout_ = keyboard_layout;
 104   last_layout_size_ = gfx::Size();
 105   if (keyboard_layout_ == KEYBOARD_LAYOUT_NUMERIC)
 106     SetRows(GetNumericRows());
 107   else
 108     SetRows(GetQWERTYRows());
 109   Layout();
 110   SchedulePaint();
 111 }
 112
 113 void KeyboardView::LayoutRow(const Row& row,
 114                              int row_index,
 115                              int initial_x,
 116                              int button_width,
 117                              int button_height) {
 118   int x = initial_x + row.padding * (button_width + kHorizontalPadding);
 119   const int y = row_index * (button_height + kVerticalPadding);
 120   for (size_t i = 0; i < row.num_keys; ++i) {
 121     views::View* button = GetButton(row_index, static_cast<int>(i));
 122     int actual_width = button_width;
 123     if (row.keys[i].size > 1) {
 124       actual_width = (button_width + kHorizontalPadding) *
 125           row.keys[i].size - kHorizontalPadding;
 126     }
 127     button->SetBounds(x, y, actual_width, button_height);
 128     x += actual_width + kHorizontalPadding;
 129   }
 130 }
 131
 132 void KeyboardView::SetRows(const std::vector<const Row*>& rows) {
 133   const int num_keys = NumKeys(rows);
 134   while (child_count() > num_keys)
 135     delete child_at(child_count() - 1);
 136   for (int i = child_count(); i < num_keys; ++i)
 137     AddChildView(CreateButton());
 138
 139   last_layout_size_ = gfx::Size();
 140
 141   rows_ = rows;
 142
 143   max_keys_in_row_ = 0;
 144   for (size_t i = 0; i < rows_.size(); ++i) {
 145     max_keys_in_row_ = std::max(max_keys_in_row_,
 146                                 static_cast<int>(rows_[i]->num_keys));
 147     ConfigureButtonsInRow(static_cast<int>(i), *rows_[i]);
 148   }
 149 }
 150
 151 void KeyboardView::ConfigureButtonsInRow(int row_index, const Row& row) {
 152   for (size_t i = 0; i < row.num_keys; ++i) {
 153     views::LabelButton* button = GetButton(row_index, static_cast<int>(i));
 154     const Key& key(row.keys[i]);
 155     switch (key.display_code) {
 156       case SPECIAL_KEY_SHIFT:
 157         // TODO: need image.
 158         button->SetText(base::string16());
 159         break;
 160       case SPECIAL_KEY_NUMERIC:
 161         button->SetText(base::ASCIIToUTF16("?123"));
 162         break;
 163       case SPECIAL_KEY_ALPHA:
 164         button->SetText(base::ASCIIToUTF16("ABC"));
 165         break;
 166       default:
 167         button->SetText(GetDisplayString(key.display_code,
 168                                          key.event_flags | event_flags()));
 169         break;
 170     }
 171     button->SetState(views::Button::STATE_NORMAL);
 172   }
 173 }
 174
 175 views::View* KeyboardView::CreateButton() {
 176   views::LabelButton* button = new views::LabelButton(this, base::string16());
 177   button->SetTextColor(views::Button::STATE_NORMAL, SK_ColorWHITE);
 178   button->SetHorizontalAlignment(gfx::ALIGN_CENTER);
 179   button->set_background(views::Background::CreateSolidBackground(78, 78, 78));
 180   button->SetFontList(button_font_);
 181   //  button->SetHaloColor(SK_ColorBLACK);
 182   // Turn off animations as we reuse buttons in different layouts. If we didn't
 183   // do this and you click a button to change the layout then the button you
 184   // clicked on would animate the transition even though it may now represent a
 185   // different key.
 186   button->SetAnimationDuration(0);
 187   return button;
 188 }
 189
 190 views::LabelButton* KeyboardView::GetButton(int row, int column) {
 191   int offset = column;
 192   for (int i = 0; i < row; ++i)
 193     offset += static_cast<int>(rows_[i]->num_keys);
 194   return static_cast<views::LabelButton*>(child_at(offset));
 195 }
 196
 197 const Key& KeyboardView::GetKeyForButton(views::Button* button) const {
 198   int index = GetIndexOf(button);
 199   DCHECK_NE(-1, index);
 200   int row = 0;
 201   while (index >= static_cast<int>(rows_[row]->num_keys)) {
 202     index -= static_cast<int>(rows_[row]->num_keys);
 203     row++;
 204   }
 205   return rows_[row]->keys[index];
 206 }
 207
 208 void KeyboardView::ResetFonts(const gfx::FontList& button_font,
 209                               const gfx::FontList& special_font) {
 210   for (size_t i = 0; i < rows_.size(); ++i) {
 211     for (size_t j = 0; j < rows_[i]->num_keys; ++j) {
 212       views::LabelButton* button = GetButton(static_cast<int>(i),
 213                                              static_cast<int>(j));
 214       const Key& key(GetKeyForButton(button));
 215       switch (key.display_code) {
 216         case SPECIAL_KEY_ALPHA:
 217         case SPECIAL_KEY_NUMERIC:
 218           button->SetFontList(special_font);
 219           break;
 220         default:
 221           button->SetFontList(button_font);
 222           break;
 223       }
 224     }
 225   }
 226 }
 227
 228 void KeyboardView::ButtonPressed(views::Button* sender,
 229                                  const ui::Event& event) {
 230   const Key& key(GetKeyForButton(sender));
 231   switch (key.display_code) {
 232     case SPECIAL_KEY_SHIFT:
 233       SetLayout((keyboard_layout_ == KEYBOARD_LAYOUT_SHIFT) ?
 234                 KEYBOARD_LAYOUT_ALPHA : KEYBOARD_LAYOUT_SHIFT);
 235       return;
 236     case SPECIAL_KEY_ALPHA:
 237       SetLayout(KEYBOARD_LAYOUT_ALPHA);
 238       return;
 239     case SPECIAL_KEY_NUMERIC:
 240       SetLayout(KEYBOARD_LAYOUT_NUMERIC);
 241       return;
 242     default:
 243       break;
 244   }
 245
 246   // Windows isn't happy if we pass in the flags used to get the display string.
 247 #if defined(OS_WIN)
 248   int key_event_flags = 0;
 249 #else
 250   int key_event_flags = key.event_flags;
 251 #endif
 252   delegate_->OnKeyPressed(key.keyboard_code(), key_event_flags | event_flags());
 253 }
 254
 255 }  // namespace examples
 256 }  // namespace mojo