intern/ghost/intern/GHOST_SystemCocoa.hh

@@ -267,6 +267,22 @@ class GHOST_SystemCocoa : public GHOST_System {
    */
   GHOST_TSuccess handleKeyEvent(void *eventPtr);
 
+  /**
+   * Show a system message box
+   * \param title: The title of the message box.
+   * \param message: The message to display.
+   * \param help_label: Help button label.
+   * \param continue_label: Continue button label.
+   * \param link: An optional hyperlink.
+   * \param dialog_options: Options  how to display the message.
+   */
+  virtual GHOST_TSuccess showMessageBox(const char *title,
+                                        const char *message,
+                                        const char *help_label,
+                                        const char *continue_label,
+                                        const char *link,
+                                        GHOST_DialogOptions dialog_options) const;
+
  protected:
   /**
    * Initializes the system.

intern/ghost/intern/GHOST_SystemCocoa.mm

@@ -2013,3 +2013,44 @@ void GHOST_SystemCocoa::putClipboard(const char *buffer, bool selection) const
     [pasteBoard setString:textToCopy forType:NSPasteboardTypeString];
   }
 }
+
+GHOST_TSuccess GHOST_SystemCocoa::showMessageBox(const char *title,
+                                                 const char *message,
+                                                 const char *help_label,
+                                                 const char *continue_label,
+                                                 const char *link,
+                                                 GHOST_DialogOptions dialog_options) const
+{
+  @autoreleasepool {
+    NSAlert *alert = [[[NSAlert alloc] init] autorelease];
+    NSString *titleString = [NSString stringWithCString:title];
+    NSString *messageString = [NSString stringWithCString:message];
+    NSString *continueString = [NSString stringWithCString:continue_label];
+    NSString *helpString = [NSString stringWithCString:help_label];
+
+    if (dialog_options == GHOST_DialogError) {
+      [alert setAlertStyle:NSAlertStyleCritical];
+    }
+    else if (dialog_options == GHOST_DialogWarning) {
+      [alert setAlertStyle:NSAlertStyleWarning];
+    }
+    else {
+      [alert setAlertStyle:NSAlertStyleInformational];
+    }
+
+    [alert setMessageText:titleString];
+    [alert setInformativeText:messageString];
+
+    [alert addButtonWithTitle:continueString];
+    if (strlen(link)) {
+      [alert addButtonWithTitle:helpString];
+    }
+
+    NSModalResponse response = [alert runModal];
+    if (response == NSAlertSecondButtonReturn) {
+      NSString *linkString = [NSString stringWithCString:link];
+      [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:linkString]];
+    }
+  }
+  return GHOST_kSuccess;
+}

intern/ghost/intern/GHOST_SystemWin32.cc

@@ -2588,8 +2588,8 @@ GHOST_TSuccess GHOST_SystemWin32::showMessageBox(const char *title,
   config.pszWindowTitle = L"Blender";
   config.pszMainInstruction = title_16;
   config.pszContent = message_16;
-  config.pButtons = (link) ? buttons : buttons + 1;
-  config.cButtons = (link) ? 2 : 1;
+  config.pButtons = strlen(link) ? buttons : buttons + 1;
+  config.cButtons = strlen(link) ? 2 : 1;
 
   TaskDialogIndirect(&config, &nButtonPressed, nullptr, nullptr);
   switch (nButtonPressed) {