feat: add message box dialogs

programs/include/gui/dialogs.hpp

@@ -17,6 +17,7 @@ namespace gui::dialogs {
 
 inline constexpr const char* LIBRARY_PATH = "0:/os/libdialogs.lib";
 inline constexpr const char* RUN_REQUEST_SYMBOL = "dialogs_run_request";
+inline constexpr const char* MESSAGE_BOX_SYMBOL = "dialogs_message_box";
 
 enum RequestKind : uint8_t {
     REQUEST_KIND_FILE = 1,
@@ -33,6 +34,21 @@ enum PrintDialogMode : uint8_t {
     PRINT_DIALOG_SUBMIT = 2,
 };
 
+enum MessageBoxButtons : uint8_t {
+    MESSAGE_BOX_OK = 1,
+    MESSAGE_BOX_OK_CANCEL = 2,
+    MESSAGE_BOX_YES_NO = 3,
+    MESSAGE_BOX_YES_NO_CANCEL = 4,
+};
+
+enum MessageBoxResult : uint8_t {
+    MESSAGE_BOX_RESULT_NONE = 0,
+    MESSAGE_BOX_RESULT_OK = 1,
+    MESSAGE_BOX_RESULT_CANCEL = 2,
+    MESSAGE_BOX_RESULT_YES = 3,
+    MESSAGE_BOX_RESULT_NO = 4,
+};
+
 struct Request {
     uint8_t kind;
     uint8_t mode;
@@ -75,10 +91,12 @@ inline void reset_result(Result* res) {
 #ifndef GUI_DIALOGS_LIBRARY_BUILD
 
 using RunRequestFn = bool (*)(const Request*, Result*);
+using MessageBoxFn = uint8_t (*)(const char*, const char*, uint8_t);
 
 struct Runtime {
     LibHandle* handle;
     RunRequestFn run_request;
+    MessageBoxFn message_box;
 };
 
 inline Runtime g_runtime = {};
@@ -101,6 +119,24 @@ inline RunRequestFn resolve_run_request(char* out_message, int out_message_len)
     return g_runtime.run_request;
 }
 
+inline MessageBoxFn resolve_message_box(char* out_message, int out_message_len) {
+    if (g_runtime.message_box) return g_runtime.message_box;
+
+    if (!g_runtime.handle) {
+        g_runtime.handle = libloader::dlopen(LIBRARY_PATH);
+        if (!g_runtime.handle) {
+            if (out_message && out_message_len > 0)
+                safe_copy(out_message, out_message_len, "failed to load dialog library");
+            return nullptr;
+        }
+    }
+
+    g_runtime.message_box = (MessageBoxFn)libloader::dlsym(g_runtime.handle, MESSAGE_BOX_SYMBOL);
+    if (!g_runtime.message_box && out_message && out_message_len > 0)
+        safe_copy(out_message, out_message_len, "failed to resolve message box entry point");
+    return g_runtime.message_box;
+}
+
 inline bool run_request(const Request* req, Result* out_res, char* out_message, int out_message_len) {
     if (out_message && out_message_len > 0) out_message[0] = '\0';
     if (!req) {
@@ -202,6 +238,22 @@ inline bool configure_print(const char* title,
     return ok;
 }
 
+inline MessageBoxResult message_box(const char* title,
+                                    const char* message,
+                                    MessageBoxButtons buttons = MESSAGE_BOX_OK,
+                                    char* out_message = nullptr, int out_message_len = 0) {
+    if (out_message && out_message_len > 0) out_message[0] = '\0';
+    MessageBoxFn fn = resolve_message_box(out_message, out_message_len);
+    if (!fn) return MESSAGE_BOX_RESULT_NONE;
+
+    uint8_t result = fn(title ? title : "Message",
+                        message ? message : "",
+                        (uint8_t)buttons);
+    if (result == MESSAGE_BOX_RESULT_NONE && out_message && out_message_len > 0 && !out_message[0])
+        safe_copy(out_message, out_message_len, "message box invocation failed");
+    return (MessageBoxResult)result;
+}
+
 #endif
 
 } // namespace gui::dialogs