Show error message, if app.init() is not called before newWindow()

2 files changed, 5 insertions, 0 deletions

diff --git a/src/nigui/private/gtk3/platform_impl.nim b/src/nigui/private/gtk3/platform_impl.nim
index 508373c..ec8a2da 100755
--- a/src/nigui/private/gtk3/platform_impl.nim
+++ b/src/nigui/private/gtk3/platform_impl.nim
@@ -581,6 +581,9 @@ proc pMainScrollbarDraw(widget: pointer, cr: pointer, data: pointer): bool {.cde
     fScrollbarSize = allocation.height
 
 proc init(window: WindowImpl) =
+  if pClipboardPtr == nil:
+    gtk_init(nil, nil)
+    raiseError("You need to call 'app.init()' at first.")
   window.fHandle = gtk_window_new(GTK_WINDOW_TOPLEVEL)
   window.fInnerHandle = gtk_scrolled_window_new(nil, nil)
   gtk_widget_show(window.fInnerHandle)
diff --git a/src/nigui/private/windows/platform_impl.nim b/src/nigui/private/windows/platform_impl.nim
index 2466e00..a07af81 100755
--- a/src/nigui/private/windows/platform_impl.nim
+++ b/src/nigui/private/windows/platform_impl.nim
@@ -698,6 +698,8 @@ method saveToJpegFile(image: Image, filePath: string, quality = 80) =
 # ----------------------------------------------------------------------------------------
 
 proc init(window: WindowImpl) =
+  if pDefaultParentWindow == nil:
+    raiseError("You need to call 'app.init()' at first.")
   var dwStyle: int32 = WS_OVERLAPPEDWINDOW
   window.fHandle = pCreateWindowExWithUserdata(pTopLevelWindowClass, dwStyle, 0, nil, cast[pointer](window))
   DragAcceptFiles(window.fHandle, true)