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Add touch gesture support for emery/flint/gabbro #2

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6520fa3
Add touch gesture support for emery/flint/gabbro platforms
brooks2564 May 9, 2026
eb306e6
Fix touch swipe crashing app by extracting navigation helpers
brooks2564 May 9, 2026
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182 changes: 100 additions & 82 deletions app/src/c/gfx/windows/viewer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,18 @@ static uint8_t hour_view = 0;
static uint8_t page_view = VIEW_PAGE_CONDITIONS;
static uint8_t active_page_view = VIEW_PAGE_NONE; // Tracks which page's set_*_view(hour) is currently active.

#if defined(PBL_PLATFORM_EMERY) || defined(PBL_PLATFORM_FLINT) || defined(PBL_PLATFORM_GABBRO)
#define PBL_TOUCHSCREEN
#endif

#ifdef PBL_TOUCHSCREEN
// Touch gesture state
#define TOUCH_SWIPE_THRESHOLD 30 // px vertical movement = hour scroll
#define TOUCH_TAP_THRESHOLD 15 // px max movement to count as a tap
static int16_t s_touch_start_x = 0;
static int16_t s_touch_start_y = 0;
#endif

// Forward declarations
static void update_view(uint8_t hour, uint8_t page);
static void apply_page_content(uint8_t hour, uint8_t page);
Expand Down Expand Up @@ -229,47 +241,23 @@ static void draw_page_images(Layer* layer, GContext* ctx) {
}
}

// Click handlers for navigation
static void prv_up_click_handler(ClickRecognizerRef recognizer, void *context) {
// Repeating presses: fast scroll without animation and without wrapping.
if (click_recognizer_is_repeating(recognizer)) {
if (animations_enabled() && animation_is_busy()) {
return;
}
if (hour_view > 0) {
hour_view--;
update_view(hour_view, page_view);
window_set_background_color(s_viewer_window, get_background_color_for_forecast(hour_view, page_view));
}
return;
}

if (animations_enabled() && animation_is_busy()) {
VIEWER_LOG(APP_LOG_LEVEL_DEBUG, "Animation busy, ignoring up click");
return;
}
// Navigation helpers — shared by click handlers and touch handler
static void prv_navigate_up(void) {
if (animations_enabled() && animation_is_busy()) return;

if(hour_view > 0) {
if(animations_enabled()) {
if (hour_view > 0) {
if (animations_enabled()) {
#ifndef PBL_PLATFORM_APLITE
// Hide any overlay that won't be visible at the destination hour before
// animations start so it doesn't linger through the transition.
if (hour_view == 11 && s_fin_layer) {
layer_set_hidden(s_fin_layer, true);
}

// Hour transition: background slides from top, images/text cross-fade.
GColor animation_color = get_background_color_for_forecast(hour_view - 1, page_view);
background_animation_start(BACKGROUND_ANIMATION_FROM_TOP, animation_color, background_animation_complete_hour);

image_animation_store_current_images();

hour_view--;
update_images_and_content_for_animation(hour_view, page_view);

const char* time_text = forecast_hours[hour_view].hour_string;
const char* content_text = text_layer_get_text(current_text_layer);

VIEWER_LOG(APP_LOG_LEVEL_DEBUG, "Starting up animation - hour: %d, time: %s", hour_view, time_text);
text_animation_start(ANIMATION_DIRECTION_UP, hour_view, time_text, content_text, animation_complete_up);
image_animation_start(ANIMATION_DIRECTION_UP, hour_view, page_view, image_animation_complete_up);
Expand All @@ -282,33 +270,57 @@ static void prv_up_click_handler(ClickRecognizerRef recognizer, void *context) {
return;
}

// Wrap: UP at hour 0 jumps straight to hour 11 without animation. The jump is
// intentionally un-animated because scrolling 11 hours in the "up" direction
// would be disorienting; prefer a snap.
// Wrap: UP at hour 0 jumps to hour 11 without animation.
hour_view = 11;
update_view(hour_view, page_view);
window_set_background_color(s_viewer_window, get_background_color_for_forecast(hour_view, page_view));
}

static void prv_select_click_handler(ClickRecognizerRef recognizer, void *context) {
if (animations_enabled() && animation_is_busy()) {
VIEWER_LOG(APP_LOG_LEVEL_DEBUG, "Animation busy, ignoring select click");
static void prv_navigate_down(void) {
if (animations_enabled() && animation_is_busy()) return;

if (hour_view < 11) {
if (animations_enabled()) {
#ifndef PBL_PLATFORM_APLITE
if (hour_view == 0 && s_status_bar) {
layer_set_hidden(status_bar_layer_get_layer(s_status_bar), true);
}
GColor animation_color = get_background_color_for_forecast(hour_view + 1, page_view);
background_animation_start(BACKGROUND_ANIMATION_FROM_BOTTOM, animation_color, background_animation_complete_hour);
image_animation_store_current_images();
hour_view++;
update_images_and_content_for_animation(hour_view, page_view);
const char* time_text = forecast_hours[hour_view].hour_string;
const char* content_text = text_layer_get_text(current_text_layer);
VIEWER_LOG(APP_LOG_LEVEL_DEBUG, "Starting down animation - hour: %d, time: %s", hour_view, time_text);
text_animation_start(ANIMATION_DIRECTION_DOWN, hour_view, time_text, content_text, animation_complete_down);
image_animation_start(ANIMATION_DIRECTION_DOWN, hour_view, page_view, image_animation_complete_down);
#endif
} else {
hour_view++;
update_view(hour_view, page_view);
window_set_background_color(s_viewer_window, get_background_color_for_forecast(hour_view, page_view));
}
return;
}

// Wrap: DOWN at hour 11 jumps to hour 0 without animation.
hour_view = 0;
update_view(hour_view, page_view);
window_set_background_color(s_viewer_window, get_background_color_for_forecast(hour_view, page_view));
}

static void prv_navigate_page(void) {
if (animations_enabled() && animation_is_busy()) return;

page_view++;
if(page_view > 2) {
page_view = 0;
}
if (page_view > 2) page_view = 0;

if(animations_enabled()) {
if (animations_enabled()) {
#ifndef PBL_PLATFORM_APLITE
// Page transition: background slides from the right, images animate out/in.
GColor animation_color = get_background_color_for_forecast(hour_view, page_view);
background_animation_start(BACKGROUND_ANIMATION_FROM_RIGHT, animation_color, background_animation_complete_page);

transition_animation_start(transition_animation_complete);

image_animation_set_current_page(page_view);
update_view(hour_view, page_view);
#endif
Expand All @@ -318,62 +330,61 @@ static void prv_select_click_handler(ClickRecognizerRef recognizer, void *contex
}
}

static void prv_down_click_handler(ClickRecognizerRef recognizer, void *context) {
// Repeating presses: fast scroll without animation and without wrapping.
// Click handlers for navigation
static void prv_up_click_handler(ClickRecognizerRef recognizer, void *context) {
if (click_recognizer_is_repeating(recognizer)) {
if (animations_enabled() && animation_is_busy()) {
return;
}
if (hour_view < 11) {
hour_view++;
if (animations_enabled() && animation_is_busy()) return;
if (hour_view > 0) {
hour_view--;
update_view(hour_view, page_view);
window_set_background_color(s_viewer_window, get_background_color_for_forecast(hour_view, page_view));
}
return;
}
prv_navigate_up();
}

if (animations_enabled() && animation_is_busy()) {
VIEWER_LOG(APP_LOG_LEVEL_DEBUG, "Animation busy, ignoring down click");
return;
}

if(hour_view < 11) {
if(animations_enabled()) {
#ifndef PBL_PLATFORM_APLITE
// Hide any overlay that won't be visible at the destination hour before
// animations start so it doesn't linger through the transition.
if (hour_view == 0 && s_status_bar) {
layer_set_hidden(status_bar_layer_get_layer(s_status_bar), true);
}

GColor animation_color = get_background_color_for_forecast(hour_view + 1, page_view);
background_animation_start(BACKGROUND_ANIMATION_FROM_BOTTOM, animation_color, background_animation_complete_hour);

image_animation_store_current_images();

hour_view++;
update_images_and_content_for_animation(hour_view, page_view);

const char* time_text = forecast_hours[hour_view].hour_string;
const char* content_text = text_layer_get_text(current_text_layer);
static void prv_select_click_handler(ClickRecognizerRef recognizer, void *context) {
prv_navigate_page();
}

VIEWER_LOG(APP_LOG_LEVEL_DEBUG, "Starting down animation - hour: %d, time: %s", hour_view, time_text);
text_animation_start(ANIMATION_DIRECTION_DOWN, hour_view, time_text, content_text, animation_complete_down);
image_animation_start(ANIMATION_DIRECTION_DOWN, hour_view, page_view, image_animation_complete_down);
#endif
} else {
static void prv_down_click_handler(ClickRecognizerRef recognizer, void *context) {
if (click_recognizer_is_repeating(recognizer)) {
if (animations_enabled() && animation_is_busy()) return;
if (hour_view < 11) {
hour_view++;
update_view(hour_view, page_view);
window_set_background_color(s_viewer_window, get_background_color_for_forecast(hour_view, page_view));
}
return;
}
prv_navigate_down();
}

// Wrap: DOWN at hour 11 jumps to hour 0 without animation (see up-wrap comment).
hour_view = 0;
update_view(hour_view, page_view);
window_set_background_color(s_viewer_window, get_background_color_for_forecast(hour_view, page_view));
#ifdef PBL_TOUCHSCREEN
static void prv_touch_handler(const TouchEvent *event, void *context) {
if (event->type == TouchEvent_Touchdown) {
s_touch_start_x = event->x;
s_touch_start_y = event->y;

} else if (event->type == TouchEvent_Liftoff) {
int16_t dx = event->x - s_touch_start_x;
int16_t dy = event->y - s_touch_start_y;
int16_t adx = dx < 0 ? -dx : dx;
int16_t ady = dy < 0 ? -dy : dy;

if (adx < TOUCH_TAP_THRESHOLD && ady < TOUCH_TAP_THRESHOLD) {
prv_navigate_page();
} else if (ady >= TOUCH_SWIPE_THRESHOLD && ady > adx) {
if (dy < 0) {
prv_navigate_down();
} else {
prv_navigate_up();
}
}
}
}
#endif

static void prv_click_config_provider(void *context) {
window_single_click_subscribe(BUTTON_ID_SELECT, prv_select_click_handler);
Expand Down Expand Up @@ -547,9 +558,16 @@ static void prv_window_load(Window *window) {
}

init_layers(window_layer);

#ifdef PBL_TOUCHSCREEN
touch_service_subscribe(prv_touch_handler, NULL);
#endif
}

static void prv_window_unload(Window *window) {
#ifdef PBL_TOUCHSCREEN
touch_service_unsubscribe();
#endif
if(animations_enabled()) {
#ifndef PBL_PLATFORM_APLITE
background_animation_deinit();
Expand Down
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