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annotate XCodeiPhoneOS/Demos/src/keyboard.c @ 2765:f55c87ae336b

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Final merge of Google Summer of Code 2008 work... Bring SDL to iPhone and iPod Touch by Holmes Futrell, mentored by Sam Lantinga
author Sam Lantinga <slouken@libsdl.org>
date Sat, 04 Oct 2008 06:46:59 +0000
parents
children 9dde605c7540
rev   line source
2765
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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_TextureID textureID; /* 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_WindowID windowID);
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17 extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardHide(SDL_WindowID windowID);
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18 extern DECLSPEC SDL_bool SDLCALL SDL_iPhoneKeyboardIsShown(SDL_WindowID
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19 windowID);
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20 extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardToggle(SDL_WindowID windowID);
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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(textureID, &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_RenderFill(bg_color.r, bg_color.g, bg_color.b, bg_color.unused,
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178 &rect);
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179 }
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180
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181 /* moves backwards one character, erasing the last one put down */
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182 void
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183 backspace(void)
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184 {
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185 int x, y;
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186 if (numChars > 0) {
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187 getPositionForCharNumber(numChars, &x, &y);
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188 drawBlank(x, y);
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189 numChars--;
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190 getPositionForCharNumber(numChars, &x, &y);
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191 drawBlank(x, y);
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192 drawCursor();
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193 }
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194 }
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195
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196 /* this function loads our font into an SDL_Texture and returns the SDL_TextureID */
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197 SDL_TextureID
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198 loadFont(void)
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199 {
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200
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201 SDL_Surface *surface = SDL_LoadBMP("kromasky_16x16.bmp");
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202
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203 if (!surface) {
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204 printf("Error loading bitmap: %s\n", SDL_GetError());
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205 return 0;
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206 } else {
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207 /* set the transparent color for the bitmap font (hot pink) */
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208 SDL_SetColorKey(surface, 1, SDL_MapRGB(surface->format, 238, 0, 252));
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209 /* now we convert the surface to our desired pixel format */
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210 int format = SDL_PIXELFORMAT_ABGR8888; /* desired texture format */
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211 Uint32 Rmask, Gmask, Bmask, Amask; /* masks for desired format */
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212 int bpp; /* bits per pixel for desired format */
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213 SDL_PixelFormatEnumToMasks(format, &bpp, &Rmask, &Gmask, &Bmask,
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214 &Amask);
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215 SDL_Surface *converted =
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216 SDL_CreateRGBSurface(0, surface->w, surface->h, bpp, Rmask, Gmask,
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217 Bmask, Amask);
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218 SDL_BlitSurface(surface, NULL, converted, NULL);
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219 /* create our texture */
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220 textureID =
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221 SDL_CreateTextureFromSurface(SDL_PIXELFORMAT_ABGR8888, converted);
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222 if (textureID == 0) {
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223 printf("texture creation failed: %s\n", SDL_GetError());
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224 } else {
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225 /* set blend mode for our texture */
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226 SDL_SetTextureBlendMode(textureID, SDL_TEXTUREBLENDMODE_BLEND);
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227 }
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228 SDL_FreeSurface(surface);
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229 SDL_FreeSurface(converted);
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230 return textureID;
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231 }
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232 }
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233
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234 int
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235 main(int argc, char *argv[])
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236 {
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237
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238 int index; /* index of last key we pushed in the bitmap font */
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239 SDL_Event event; /* last event received */
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240 SDLMod mod; /* key modifiers of last key we pushed */
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diff changeset
241 SDL_scancode scancode; /* scancode of last key we pushed */
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242
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243 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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244 printf("Error initializing SDL: %s", SDL_GetError());
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245 }
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246 /* create window */
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247 SDL_WindowID windowID =
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248 SDL_CreateWindow("iPhone keyboard test", 0, 0, SCREEN_WIDTH,
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249 SCREEN_HEIGHT, 0);
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250 /* create renderer */
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251 SDL_CreateRenderer(windowID, 0, 0);
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252
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253 /* load up our font */
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diff changeset
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_RenderFill(bg_color.r, bg_color.g, bg_color.b, bg_color.unused, NULL);
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258 SDL_RenderPresent();
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259
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diff changeset
260 int done = 0;
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261 /* loop till we get SDL_Quit */
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diff changeset
262 while (SDL_WaitEvent(&event)) {
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263 switch (event.type) {
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264 case SDL_QUIT:
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265 done = 1;
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266 break;
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267 case SDL_KEYDOWN:
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268 index = keyToIndex(event.key.keysym);
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269 scancode = event.key.keysym.scancode;
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270 mod = event.key.keysym.mod;
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271 if (scancode == SDL_SCANCODE_DELETE) {
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272 /* if user hit delete, delete the last character */
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273 backspace();
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diff changeset
274 lastCharWasColon = 0;
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275 } else if (lastCharWasColon && scancode == SDL_SCANCODE_0
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diff changeset
276 && (mod & KMOD_SHIFT)) {
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diff changeset
277 /* if our last key was a colon and this one is a close paren, the make a hoppy face */
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diff changeset
278 backspace();
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279 drawIndex(32); /* index for happy face */
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280 numChars++;
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281 drawCursor();
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282 lastCharWasColon = 0;
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283 } else if (index != -1) {
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284 /* if we aren't doing a happy face, then just draw the normal character */
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285 drawIndex(index);
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286 numChars++;
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287 drawCursor();
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288 lastCharWasColon =
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289 (event.key.keysym.scancode == SDL_SCANCODE_SEMICOLON
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290 && (event.key.keysym.mod & KMOD_SHIFT));
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291 }
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292 /* check if the key was a colon */
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293 /* draw our updates to the screen */
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294 SDL_RenderPresent();
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295 break;
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296 #ifdef __IPHONEOS__
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297 case SDL_MOUSEBUTTONUP:
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298 /* mouse up toggles onscreen keyboard visibility
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299 this function is available ONLY on iPhone OS
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300 */
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301 SDL_iPhoneKeyboardToggle(windowID);
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302 break;
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303 #endif
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304 }
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305 }
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306 cleanup();
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307 return 0;
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308 }
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309
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310 /* clean up after ourselves like a good kiddy */
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311 void
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312 cleanup(void)
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313 {
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314 SDL_DestroyTexture(textureID);
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315 SDL_Quit();
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316 }