Merge pull request #433 from malisipi/high-contrast-management

High Contrast Management
webui-dev · Jun 25, 2024 · 6b539c3 · 6b539c3
2 parents f40d35a + 900e6f8
commit 6b539c3
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Showing 2 changed files with 97 additions and 3 deletions.
diff --git a/include/webui.h b/include/webui.h
@@ -278,6 +278,25 @@ WEBUI_EXPORT bool webui_show_wv(size_t window, const char* content);
  */
 WEBUI_EXPORT void webui_set_kiosk(size_t window, bool status);
 
+/**
+ * @brief Set the window high contrast support. It would be useful when default high contrast support of browser is not working fine or you want to build better high contrast theme by CSS.
+ *
+ * @param window The window number
+ * @param status True or False
+ *
+ * @example webui_set_high_contrast_support(myWindow, true);
+ */
+WEBUI_EXPORT void webui_set_high_contrast_support(size_t window, bool status);
+
+/**
+ * @brief Get user high contrast preference.
+ *
+ * @return Returns True if user is using high contrast theme
+ *
+ * @example webui_user_prefers_high_contrast();
+ */
+bool webui_user_prefers_high_contrast();
+
 /**
  * @brief Wait until all opened windows get closed.
  *

diff --git a/src/webui.c b/src/webui.c
@@ -303,6 +303,7 @@ typedef struct _webui_window_t {
     bool has_events;
     char* server_root_path;
     bool kiosk_mode;
+    bool disable_high_contrast_support;
     bool hide;
     int width;
     int height;
@@ -899,6 +900,67 @@ void webui_set_kiosk(size_t window, bool status) {
     win->kiosk_mode = status;
 }
 
+void webui_set_high_contrast_support(size_t window, bool status) {
+
+    #ifdef WEBUI_LOG
+    printf("[User] webui_set_high_contrast_support([%zu])\n", window);
+    #endif
+
+    // Initialization
+    _webui_init();
+
+    // Dereference
+    if (_webui_mutex_is_exit_now(WEBUI_MUTEX_NONE) || _webui_core.wins[window] == NULL)
+        return;
+    _webui_window_t * win = _webui_core.wins[window];
+
+    win->disable_high_contrast_support = !status;
+}
+
+bool webui_user_prefers_high_contrast() {
+
+    #ifdef WEBUI_LOG
+    printf("[User] webui_set_high_contrast_support()\n");
+    #endif
+
+    // Initialization
+    _webui_init();
+
+    bool is_enabled = false;
+
+    #ifdef _WIN32
+        char high_contrast_flags_as_char[WEBUI_MAX_PATH];
+
+        _webui_get_windows_reg_value(
+            HKEY_CURRENT_USER,
+            L"Control Panel\\Accessibility\\"
+            L"HighContrast",
+            L"Flags", high_contrast_flags_as_char
+        );
+
+        int high_contrast_flags = atoi(high_contrast_flags_as_char);
+
+        is_enabled = (high_contrast_flags & 0x01) == 1;
+
+    #elif __linux__
+        FILE* process_output;
+        char buf[100];
+
+        process_output = popen("gsettings get org.gnome.desktop.a11y.interface high-contrast", "r");
+        if (process_output != NULL && fgets(buf, sizeof(buf), process_output) != NULL) { // Running the command is not failed and fgets works correctly
+            is_enabled = strstr(buf, "true") != NULL;
+        }
+
+        pclose(process_output);
+    #endif
+
+    #ifdef WEBUI_LOG
+    printf("[User] webui_set_high_contrast_support() -> %d", is_enabled);
+    #endif
+
+    return is_enabled;
+}
+
 void webui_close(size_t window) {
 
     #ifdef WEBUI_LOG
@@ -4288,7 +4350,10 @@ static bool _webui_browser_create_new_profile(_webui_window_t * win, size_t brow
             _webui_free_mem((void * ) win->profile_path);
         win->profile_path = (char*)_webui_malloc(WEBUI_MAX_PATH);
         win->profile_name = (char*)_webui_malloc(WEBUI_MAX_PATH);
-        WEBUI_SCOPY_DYN(win->profile_name, WEBUI_MAX_PATH, WEBUI_PROFILE_NAME);
+        if(!win->disable_high_contrast_support)
+            WEBUI_SCOPY_DYN(win->profile_name, WEBUI_MAX_PATH, WEBUI_PROFILE_NAME);
+        else
+            WEBUI_SCOPY_DYN(win->profile_name, WEBUI_MAX_PATH, WEBUI_PROFILE_NAME "-NoHC");
     }
 
     #ifdef WEBUI_LOG
@@ -4363,8 +4428,12 @@ static bool _webui_browser_create_new_profile(_webui_window_t * win, size_t brow
         // macOS
         const char* path_ini = "~/Library/Application Support/Firefox/profiles.ini";
         #endif
-        if (!win->custom_profile)
-            WEBUI_SPF_DYN(win->profile_path, WEBUI_MAX_PATH, "%s%s.WebUI%sWebUIFirefoxProfile", temp, webui_sep, webui_sep);
+        if (!win->custom_profile){
+            if(!win->disable_high_contrast_support)
+                WEBUI_SPF_DYN(win->profile_path, WEBUI_MAX_PATH, "%s%s.WebUI%sWebUIFirefoxProfile", temp, webui_sep, webui_sep);
+            else
+                WEBUI_SPF_DYN(win->profile_path, WEBUI_MAX_PATH, "%s%s.WebUI%sWebUIFirefoxNoHighContrastProfile", temp, webui_sep, webui_sep);
+        }
 
         if (!_webui_folder_exist(win->profile_path) ||
             !_webui_is_firefox_ini_profile_exist(path_ini, win->profile_name)) {
@@ -4415,6 +4484,9 @@ static bool _webui_browser_create_new_profile(_webui_window_t * win, size_t brow
             fputs("user_pref(\"browser.shell.checkDefaultBrowser\", false); ", file);
             fputs("user_pref(\"browser.tabs.warnOnClose\", false); ", file);
             fputs("user_pref(\"browser.tabs.inTitlebar\", 0); ", file);
+            if(win->disable_high_contrast_support){
+                fputs("user_pref(\"browser.display.document_color_use\", 1); ", file);
+            }
             fclose(file);
 
             // userChrome.css
@@ -5497,6 +5569,9 @@ static int _webui_get_browser_args(_webui_window_t * win, size_t browser, char*
             // Kiosk Mode
             if (win->kiosk_mode)
                 c += WEBUI_SPF_DYN(buffer + c, len, " %s", "--chrome-frame --kiosk");
+            // High Contrast Support
+            if (win->disable_high_contrast_support)
+                c += WEBUI_SPF_DYN(buffer + c, len, " %s", "--disable-features=ForcedColors");
             // Hide Mode
             if (win->hide)
                 c += WEBUI_SPF_DYN(buffer + c, len, " %s", "--headless --headless=new");