Mercurial > sdl-ios-xcode
annotate Xcode-iPhoneOS/Demos/src/keyboard.c @ 4617:cfbb1ff4b8ec
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author | Sunny Sachanandani <sunnysachanandani@gmail.com> |
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date | Wed, 28 Jul 2010 13:08:14 +0530 |
parents | 64ce267332c6 |
children | 25d4feb7c127 |
rev | line source |
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1 /* |
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2 * keyboard.c |
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3 * written by Holmes Futrell |
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4 * use however you want |
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5 */ |
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6 |
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7 #import "SDL.h" |
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8 #import "common.h" |
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9 |
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10 #define GLYPH_SIZE_IMAGE 16 /* size of glyphs (characters) in the bitmap font file */ |
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11 #define GLYPH_SIZE_SCREEN 32 /* size of glyphs (characters) as shown on the screen */ |
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12 |
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13 static SDL_Texture *texture; /* texture where we'll hold our font */ |
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14 |
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15 /* iPhone SDL addition keyboard related function definitions */ |
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16 extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardShow(SDL_Window * window); |
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17 extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardHide(SDL_Window * window); |
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18 extern DECLSPEC SDL_bool SDLCALL SDL_iPhoneKeyboardIsShown(SDL_Window * |
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19 window); |
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20 extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardToggle(SDL_Window * window); |
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21 |
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22 /* function declarations */ |
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23 void cleanup(void); |
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24 void drawBlank(int x, int y); |
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25 |
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26 static int numChars = 0; /* number of characters we've typed so far */ |
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27 static SDL_bool lastCharWasColon = 0; /* we use this to detect sequences such as :) */ |
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28 static SDL_Color bg_color = { 50, 50, 100, 255 }; /* color of background */ |
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29 |
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30 /* this structure maps a scancode to an index in our bitmap font. |
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31 it also contains data about under which modifiers the mapping is valid |
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32 (for example, we don't want shift + 1 to produce the character '1', |
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33 but rather the character '!') |
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34 */ |
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35 typedef struct |
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36 { |
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37 SDL_scancode scancode; /* scancode of the key we want to map */ |
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38 int allow_no_mod; /* is the map valid if the key has no modifiers? */ |
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39 SDLMod mod; /* what modifiers are allowed for the mapping */ |
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40 int index; /* what index in the font does the scancode map to */ |
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41 } fontMapping; |
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42 |
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43 #define TABLE_SIZE 51 /* size of our table which maps keys and modifiers to font indices */ |
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44 |
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45 /* Below is the table that defines the mapping between scancodes and modifiers to indices in the |
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46 bitmap font. As an example, then line '{ SDL_SCANCODE_A, 1, KMOD_SHIFT, 33 }' means, map |
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47 the key A (which has scancode SDL_SCANCODE_A) to index 33 in the font (which is a picture of an A), |
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48 The '1' means that the mapping is valid even if there are no modifiers, and KMOD_SHIFT means the |
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49 mapping is also valid if the user is holding shift. |
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50 */ |
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51 fontMapping map[TABLE_SIZE] = { |
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52 |
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53 {SDL_SCANCODE_A, 1, KMOD_SHIFT, 33}, /* A */ |
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54 {SDL_SCANCODE_B, 1, KMOD_SHIFT, 34}, /* B */ |
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55 {SDL_SCANCODE_C, 1, KMOD_SHIFT, 35}, /* C */ |
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56 {SDL_SCANCODE_D, 1, KMOD_SHIFT, 36}, /* D */ |
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57 {SDL_SCANCODE_E, 1, KMOD_SHIFT, 37}, /* E */ |
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58 {SDL_SCANCODE_F, 1, KMOD_SHIFT, 38}, /* F */ |
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59 {SDL_SCANCODE_G, 1, KMOD_SHIFT, 39}, /* G */ |
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60 {SDL_SCANCODE_H, 1, KMOD_SHIFT, 40}, /* H */ |
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61 {SDL_SCANCODE_I, 1, KMOD_SHIFT, 41}, /* I */ |
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62 {SDL_SCANCODE_J, 1, KMOD_SHIFT, 42}, /* J */ |
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63 {SDL_SCANCODE_K, 1, KMOD_SHIFT, 43}, /* K */ |
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64 {SDL_SCANCODE_L, 1, KMOD_SHIFT, 44}, /* L */ |
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65 {SDL_SCANCODE_M, 1, KMOD_SHIFT, 45}, /* M */ |
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66 {SDL_SCANCODE_N, 1, KMOD_SHIFT, 46}, /* N */ |
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67 {SDL_SCANCODE_O, 1, KMOD_SHIFT, 47}, /* O */ |
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68 {SDL_SCANCODE_P, 1, KMOD_SHIFT, 48}, /* P */ |
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69 {SDL_SCANCODE_Q, 1, KMOD_SHIFT, 49}, /* Q */ |
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70 {SDL_SCANCODE_R, 1, KMOD_SHIFT, 50}, /* R */ |
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71 {SDL_SCANCODE_S, 1, KMOD_SHIFT, 51}, /* S */ |
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72 {SDL_SCANCODE_T, 1, KMOD_SHIFT, 52}, /* T */ |
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73 {SDL_SCANCODE_U, 1, KMOD_SHIFT, 53}, /* U */ |
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74 {SDL_SCANCODE_V, 1, KMOD_SHIFT, 54}, /* V */ |
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75 {SDL_SCANCODE_W, 1, KMOD_SHIFT, 55}, /* W */ |
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76 {SDL_SCANCODE_X, 1, KMOD_SHIFT, 56}, /* X */ |
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77 {SDL_SCANCODE_Y, 1, KMOD_SHIFT, 57}, /* Y */ |
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78 {SDL_SCANCODE_Z, 1, KMOD_SHIFT, 58}, /* Z */ |
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79 {SDL_SCANCODE_0, 1, 0, 16}, /* 0 */ |
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80 {SDL_SCANCODE_1, 1, 0, 17}, /* 1 */ |
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81 {SDL_SCANCODE_2, 1, 0, 18}, /* 2 */ |
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82 {SDL_SCANCODE_3, 1, 0, 19}, /* 3 */ |
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83 {SDL_SCANCODE_4, 1, 0, 20}, /* 4 */ |
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84 {SDL_SCANCODE_5, 1, 0, 21}, /* 5 */ |
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85 {SDL_SCANCODE_6, 1, 0, 22}, /* 6 */ |
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86 {SDL_SCANCODE_7, 1, 0, 23}, /* 7 */ |
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87 {SDL_SCANCODE_8, 1, 0, 24}, /* 8 */ |
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88 {SDL_SCANCODE_9, 1, 0, 25}, /* 9 */ |
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89 {SDL_SCANCODE_SPACE, 1, 0, 0}, /*' ' */ |
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90 {SDL_SCANCODE_1, 0, KMOD_SHIFT, 1}, /* ! */ |
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91 {SDL_SCANCODE_SLASH, 0, KMOD_SHIFT, 31}, /* ? */ |
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92 {SDL_SCANCODE_SLASH, 1, 0, 15}, /* / */ |
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93 {SDL_SCANCODE_COMMA, 1, 0, 12}, /* , */ |
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94 {SDL_SCANCODE_SEMICOLON, 1, 0, 27}, /* ; */ |
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95 {SDL_SCANCODE_SEMICOLON, 0, KMOD_SHIFT, 26}, /* : */ |
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96 {SDL_SCANCODE_PERIOD, 1, 0, 14}, /* . */ |
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97 {SDL_SCANCODE_MINUS, 1, 0, 13}, /* - */ |
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98 {SDL_SCANCODE_EQUALS, 0, KMOD_SHIFT, 11}, /* = */ |
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99 {SDL_SCANCODE_APOSTROPHE, 1, 0, 7}, /* ' */ |
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100 {SDL_SCANCODE_APOSTROPHE, 0, KMOD_SHIFT, 2}, /* " */ |
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101 {SDL_SCANCODE_5, 0, KMOD_SHIFT, 5}, /* % */ |
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102 |
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103 }; |
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104 |
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105 /* |
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106 This function maps an SDL_keysym to an index in the bitmap font. |
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107 It does so by scanning through the font mapping table one entry |
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108 at a time. |
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109 |
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110 If a match is found (scancode and allowed modifiers), the proper |
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111 index is returned. |
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112 |
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113 If there is no entry for the key, -1 is returned |
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114 */ |
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115 int |
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116 keyToIndex(SDL_keysym key) |
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117 { |
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118 int i, index = -1; |
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119 for (i = 0; i < TABLE_SIZE; i++) { |
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120 fontMapping compare = map[i]; |
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121 if (key.scancode == compare.scancode) { |
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122 /* if this entry is valid with no key mod and we have no keymod, or if |
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123 the key's modifiers are allowed modifiers for that mapping */ |
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124 if ((compare.allow_no_mod && key.mod == 0) |
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125 || (key.mod & compare.mod)) { |
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126 index = compare.index; |
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127 break; |
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128 } |
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129 } |
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130 } |
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131 return index; |
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132 } |
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133 |
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134 /* |
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135 This function returns and x,y position for a given character number. |
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136 It is used for positioning each character of text |
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137 */ |
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138 void |
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139 getPositionForCharNumber(int n, int *x, int *y) |
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140 { |
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141 int x_padding = 16; /* padding space on left and right side of screen */ |
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142 int y_padding = 32; /* padding space at top of screen */ |
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143 /* figure out the number of characters that can fit horizontally across the screen */ |
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144 int max_x_chars = (SCREEN_WIDTH - 2 * x_padding) / GLYPH_SIZE_SCREEN; |
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145 int line_separation = 5; /* pixels between each line */ |
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146 *x = (n % max_x_chars) * GLYPH_SIZE_SCREEN + x_padding; |
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147 *y = (n / max_x_chars) * (GLYPH_SIZE_SCREEN + line_separation) + |
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148 y_padding; |
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149 } |
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150 |
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151 void |
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152 drawIndex(int index) |
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153 { |
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154 int x, y; |
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155 getPositionForCharNumber(numChars, &x, &y); |
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156 SDL_Rect srcRect = |
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157 { GLYPH_SIZE_IMAGE * index, 0, GLYPH_SIZE_IMAGE, GLYPH_SIZE_IMAGE }; |
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158 SDL_Rect dstRect = { x, y, GLYPH_SIZE_SCREEN, GLYPH_SIZE_SCREEN }; |
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159 drawBlank(x, y); |
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160 SDL_RenderCopy(texture, &srcRect, &dstRect); |
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161 } |
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162 |
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163 /* draws the cursor icon at the current end position of the text */ |
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164 void |
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165 drawCursor(void) |
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166 { |
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167 drawIndex(29); /* cursor is at index 29 in the bitmap font */ |
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168 } |
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169 |
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170 /* paints over a glyph sized region with the background color |
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171 in effect it erases the area |
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172 */ |
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173 void |
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174 drawBlank(int x, int y) |
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175 { |
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176 SDL_Rect rect = { x, y, GLYPH_SIZE_SCREEN, GLYPH_SIZE_SCREEN }; |
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177 SDL_SetRenderDrawColor(bg_color.r, bg_color.g, bg_color.b, |
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178 bg_color.unused); |
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179 SDL_RenderFill(&rect); |
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180 } |
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181 |
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182 /* moves backwards one character, erasing the last one put down */ |
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183 void |
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184 backspace(void) |
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185 { |
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186 int x, y; |
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187 if (numChars > 0) { |
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188 getPositionForCharNumber(numChars, &x, &y); |
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189 drawBlank(x, y); |
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190 numChars--; |
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191 getPositionForCharNumber(numChars, &x, &y); |
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192 drawBlank(x, y); |
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193 drawCursor(); |
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194 } |
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195 } |
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196 |
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197 /* this function loads our font into an SDL_Texture and returns the SDL_Texture */ |
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198 SDL_Texture* |
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199 loadFont(void) |
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200 { |
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201 |
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202 SDL_Surface *surface = SDL_LoadBMP("kromasky_16x16.bmp"); |
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203 |
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204 if (!surface) { |
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205 printf("Error loading bitmap: %s\n", SDL_GetError()); |
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206 return 0; |
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207 } else { |
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208 /* set the transparent color for the bitmap font (hot pink) */ |
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209 SDL_SetColorKey(surface, 1, SDL_MapRGB(surface->format, 238, 0, 252)); |
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210 /* now we convert the surface to our desired pixel format */ |
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211 int format = SDL_PIXELFORMAT_ABGR8888; /* desired texture format */ |
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212 Uint32 Rmask, Gmask, Bmask, Amask; /* masks for desired format */ |
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213 int bpp; /* bits per pixel for desired format */ |
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214 SDL_PixelFormatEnumToMasks(format, &bpp, &Rmask, &Gmask, &Bmask, |
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215 &Amask); |
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216 SDL_Surface *converted = |
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217 SDL_CreateRGBSurface(0, surface->w, surface->h, bpp, Rmask, Gmask, |
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218 Bmask, Amask); |
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219 SDL_BlitSurface(surface, NULL, converted, NULL); |
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220 /* create our texture */ |
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221 texture = |
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222 SDL_CreateTextureFromSurface(SDL_PIXELFORMAT_ABGR8888, converted); |
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223 if (texture == 0) { |
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224 printf("texture creation failed: %s\n", SDL_GetError()); |
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225 } else { |
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226 /* set blend mode for our texture */ |
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227 SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND); |
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228 } |
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229 SDL_FreeSurface(surface); |
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230 SDL_FreeSurface(converted); |
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231 return texture; |
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232 } |
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233 } |
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234 |
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235 int |
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236 main(int argc, char *argv[]) |
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237 { |
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238 |
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239 int index; /* index of last key we pushed in the bitmap font */ |
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240 SDL_Window *window; |
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241 SDL_Event event; /* last event received */ |
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242 SDLMod mod; /* key modifiers of last key we pushed */ |
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243 SDL_scancode scancode; /* scancode of last key we pushed */ |
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244 |
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245 if (SDL_Init(SDL_INIT_VIDEO) < 0) { |
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246 printf("Error initializing SDL: %s", SDL_GetError()); |
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247 } |
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248 /* create window */ |
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249 window = SDL_CreateWindow("iPhone keyboard test", 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, 0); |
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250 /* create renderer */ |
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251 SDL_CreateRenderer(window, 0, 0); |
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252 |
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253 /* load up our font */ |
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254 loadFont(); |
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255 |
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256 /* draw the background, we'll just paint over it */ |
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257 SDL_SetRenderDrawColor(bg_color.r, bg_color.g, bg_color.b, |
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258 bg_color.unused); |
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259 SDL_RenderFill(NULL); |
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260 SDL_RenderPresent(); |
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261 |
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262 int done = 0; |
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263 /* loop till we get SDL_Quit */ |
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264 while (SDL_WaitEvent(&event)) { |
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265 switch (event.type) { |
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266 case SDL_QUIT: |
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267 done = 1; |
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268 break; |
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269 case SDL_KEYDOWN: |
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270 index = keyToIndex(event.key.keysym); |
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271 scancode = event.key.keysym.scancode; |
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272 mod = event.key.keysym.mod; |
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273 if (scancode == SDL_SCANCODE_DELETE) { |
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274 /* if user hit delete, delete the last character */ |
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275 backspace(); |
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276 lastCharWasColon = 0; |
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277 } else if (lastCharWasColon && scancode == SDL_SCANCODE_0 |
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278 && (mod & KMOD_SHIFT)) { |
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279 /* if our last key was a colon and this one is a close paren, the make a hoppy face */ |
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280 backspace(); |
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281 drawIndex(32); /* index for happy face */ |
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282 numChars++; |
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283 drawCursor(); |
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284 lastCharWasColon = 0; |
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285 } else if (index != -1) { |
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286 /* if we aren't doing a happy face, then just draw the normal character */ |
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287 drawIndex(index); |
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288 numChars++; |
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289 drawCursor(); |
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290 lastCharWasColon = |
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291 (event.key.keysym.scancode == SDL_SCANCODE_SEMICOLON |
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292 && (event.key.keysym.mod & KMOD_SHIFT)); |
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293 } |
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294 /* check if the key was a colon */ |
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295 /* draw our updates to the screen */ |
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296 SDL_RenderPresent(); |
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297 break; |
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298 #ifdef __IPHONEOS__ |
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299 case SDL_MOUSEBUTTONUP: |
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300 /* mouse up toggles onscreen keyboard visibility |
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301 this function is available ONLY on iPhone OS |
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302 */ |
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303 SDL_iPhoneKeyboardToggle(window); |
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304 break; |
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305 #endif |
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306 } |
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307 } |
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308 cleanup(); |
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309 return 0; |
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310 } |
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311 |
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312 /* clean up after ourselves like a good kiddy */ |
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313 void |
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314 cleanup(void) |
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315 { |
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316 SDL_DestroyTexture(texture); |
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317 SDL_Quit(); |
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318 } |