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Improve iOS keyboard demo code a bit.

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slime73 committed Aug 16, 2017
1 parent 2e4248e commit a0a09f646c24de9d10dcc371f11c972a6d9db0a0
Showing with 65 additions and 111 deletions.
  1. +61 −105 Xcode-iOS/Demos/src/keyboard.c
  2. +4 −6 src/video/uikit/SDL_uikitvideo.m
@@ -10,17 +10,16 @@
#define GLYPH_SIZE_IMAGE 16 /* size of glyphs (characters) in the bitmap font file */
#define GLYPH_SIZE_SCREEN 32 /* size of glyphs (characters) as shown on the screen */

static SDL_Texture *texture; /* texture where we'll hold our font */
#define MAX_CHARS 1024

/* function declarations */
void cleanup(void);
void drawBlank(int x, int y);
static SDL_Texture *texture; /* texture where we'll hold our font */

static SDL_Renderer *renderer;
static int numChars = 0; /* number of characters we've typed so far */
static SDL_bool lastCharWasColon = 0; /* we use this to detect sequences such as :) */
static SDL_Color bg_color = { 50, 50, 100, 255 }; /* color of background */

static int glyphs[MAX_CHARS];

/* this structure maps a scancode to an index in our bitmap font.
it also contains data about under which modifiers the mapping is valid
(for example, we don't want shift + 1 to produce the character '1',
@@ -107,7 +106,7 @@ fontMapping map[TABLE_SIZE] = {
If there is no entry for the key, -1 is returned
*/
int
keyToIndex(SDL_Keysym key)
keyToGlyphIndex(SDL_Keysym key)
{
int i, index = -1;
for (i = 0; i < TABLE_SIZE; i++) {
@@ -141,55 +140,19 @@ getPositionForCharNumber(int n, int *x, int *y)
int max_x_chars = (renderW - 2 * x_padding) / GLYPH_SIZE_SCREEN;
int line_separation = 5; /* pixels between each line */
*x = (n % max_x_chars) * GLYPH_SIZE_SCREEN + x_padding;
*y = (n / max_x_chars) * (GLYPH_SIZE_SCREEN + line_separation) +
y_padding;
*y = (n / max_x_chars) * (GLYPH_SIZE_SCREEN + line_separation) + y_padding;
}

void
drawIndex(int index)
drawGlyph(int glyph, int positionIndex)
{
int x, y;
getPositionForCharNumber(numChars, &x, &y);
SDL_Rect srcRect =
{ GLYPH_SIZE_IMAGE * index, 0, GLYPH_SIZE_IMAGE, GLYPH_SIZE_IMAGE };
getPositionForCharNumber(positionIndex, &x, &y);
SDL_Rect srcRect = { GLYPH_SIZE_IMAGE * glyph, 0, GLYPH_SIZE_IMAGE, GLYPH_SIZE_IMAGE };
SDL_Rect dstRect = { x, y, GLYPH_SIZE_SCREEN, GLYPH_SIZE_SCREEN };
drawBlank(x, y);
SDL_RenderCopy(renderer, texture, &srcRect, &dstRect);
}

/* draws the cursor icon at the current end position of the text */
void
drawCursor(void)
{
drawIndex(29); /* cursor is at index 29 in the bitmap font */
}

/* paints over a glyph sized region with the background color
in effect it erases the area
*/
void
drawBlank(int x, int y)
{
SDL_Rect rect = { x, y, GLYPH_SIZE_SCREEN, GLYPH_SIZE_SCREEN };
SDL_SetRenderDrawColor(renderer, bg_color.r, bg_color.g, bg_color.b, bg_color.a);
SDL_RenderFillRect(renderer, &rect);
}

/* moves backwards one character, erasing the last one put down */
void
backspace(void)
{
int x, y;
if (numChars > 0) {
getPositionForCharNumber(numChars, &x, &y);
drawBlank(x, y);
numChars--;
getPositionForCharNumber(numChars, &x, &y);
drawBlank(x, y);
drawCursor();
}
}

/* this function loads our font into an SDL_Texture and returns the SDL_Texture */
SDL_Texture*
loadFont(void)
@@ -214,8 +177,7 @@ loadFont(void)
Bmask, Amask);
SDL_BlitSurface(surface, NULL, converted, NULL);
/* create our texture */
texture =
SDL_CreateTextureFromSurface(renderer, converted);
texture = SDL_CreateTextureFromSurface(renderer, converted);
if (texture == 0) {
printf("texture creation failed: %s\n", SDL_GetError());
} else {
@@ -228,13 +190,27 @@ loadFont(void)
}
}

void
draw()
{
SDL_SetRenderDrawColor(renderer, bg_color.r, bg_color.g, bg_color.b, bg_color.a);
SDL_RenderClear(renderer);

for (int i = 0; i < numChars; i++) {
drawGlyph(glyphs[i], i);
}

drawGlyph(29, numChars); /* cursor is at index 29 in the bitmap font */

SDL_RenderPresent(renderer);
}

int
main(int argc, char *argv[])
{
int index; /* index of last key we pushed in the bitmap font */
SDL_Window *window;
SDL_Event event; /* last event received */
SDL_Keymod mod; /* key modifiers of last key we pushed */
SDL_Scancode scancode; /* scancode of last key we pushed */
int width;
int height;
@@ -245,73 +221,53 @@ main(int argc, char *argv[])
/* create window */
window = SDL_CreateWindow("iPhone keyboard test", 0, 0, 320, 480, SDL_WINDOW_ALLOW_HIGHDPI);
/* create renderer */
renderer = SDL_CreateRenderer(window, -1, 0);
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_PRESENTVSYNC);

SDL_GetWindowSize(window, &width, &height);
SDL_RenderSetLogicalSize(renderer, width, height);

/* load up our font */
loadFont();

/* draw the background, we'll just paint over it */
SDL_SetRenderDrawColor(renderer, bg_color.r, bg_color.g, bg_color.b, bg_color.a);
SDL_RenderFillRect(renderer, NULL);
SDL_RenderPresent(renderer);

int done = 0;
/* loop till we get SDL_Quit */
while (!done && SDL_WaitEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
done = 1;
break;
case SDL_KEYDOWN:
index = keyToIndex(event.key.keysym);
scancode = event.key.keysym.scancode;
mod = event.key.keysym.mod;
if (scancode == SDL_SCANCODE_DELETE) {
/* if user hit delete, delete the last character */
backspace();
lastCharWasColon = 0;
} else if (lastCharWasColon && scancode == SDL_SCANCODE_0
&& (mod & KMOD_SHIFT)) {
/* if our last key was a colon and this one is a close paren, the make a hoppy face */
backspace();
drawIndex(32); /* index for happy face */
numChars++;
drawCursor();
lastCharWasColon = 0;
} else if (index != -1) {
/* if we aren't doing a happy face, then just draw the normal character */
drawIndex(index);
numChars++;
drawCursor();
lastCharWasColon =
(event.key.keysym.scancode == SDL_SCANCODE_SEMICOLON
&& (event.key.keysym.mod & KMOD_SHIFT));
}
/* check if the key was a colon */
/* draw our updates to the screen */
SDL_RenderPresent(renderer);
break;
case SDL_MOUSEBUTTONUP:
/* mouse up toggles onscreen keyboard visibility */
if (SDL_IsTextInputActive()) {
SDL_StopTextInput();
} else {
SDL_StartTextInput();

while (!done) {
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
done = 1;
break;
case SDL_TEXTINPUT:
break;
case SDL_KEYDOWN:
if (event.key.keysym.scancode == SDL_SCANCODE_BACKSPACE) {
if (numChars > 0) {
numChars--;
}
} else if (numChars + 1 < MAX_CHARS) {
int index = keyToGlyphIndex(event.key.keysym);
if (index >= 0) {
glyphs[numChars++] = index;
}
}
break;
case SDL_MOUSEBUTTONUP:
/* mouse up toggles onscreen keyboard visibility */
if (SDL_IsTextInputActive()) {
SDL_StopTextInput();
} else {
SDL_StartTextInput();
}
break;
}
break;
}

draw();
SDL_Delay(15);
}
cleanup();
return 0;
}

/* clean up after ourselves like a good kiddy */
void
cleanup(void)
{
SDL_DestroyTexture(texture);
SDL_Quit();
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
return 0;
}
@@ -179,15 +179,13 @@ static void UIKit_DeleteDevice(SDL_VideoDevice * device)
#if !TARGET_OS_TV && (__IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0)
BOOL hasiOS7 = UIKit_IsSystemVersionAtLeast(7.0);

if (hasiOS7 || (window->flags & (SDL_WINDOW_BORDERLESS|SDL_WINDOW_FULLSCREEN))) {
/* The view should always show behind the status bar in iOS 7+. */
return screen.bounds;
} else {
/* The view should always show behind the status bar in iOS 7+. */
if (!hasiOS7 && !(window->flags & (SDL_WINDOW_BORDERLESS|SDL_WINDOW_FULLSCREEN))) {
return screen.applicationFrame;
}
#else
return screen.bounds;
#endif

return screen.bounds;
}

/*

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