add ppbr export dialog, implement text input focus

src/app_dialogs.cpp

@@ -12,6 +12,7 @@
 #ifdef __QUEST__
 #include "oculus_vr.h"
 #endif
+#include "node_dialog_export_ppbr.h"
 
 std::shared_ptr<NodeProgressBar> App::show_progress(const std::string& title, int total /*= 0*/)
 {
@@ -595,3 +596,25 @@ void App::dialog_preset_download()
 {
 
 }
+
+void App::dialog_ppbr_export()
+{
+    auto root = layout[main_id];
+    auto dialog = root->add_child_ref<NodeDialogExportPPBR>();
+    dialog->btn_ok->on_click = [this,dialog] (Node*) {
+#if __IOS__
+        App::I->pick_file_save("ppbr", [this](std::string path) {
+            presets->export_ppbr(path, {});
+        });
+#else
+        App::I->pick_file_save({ "ppbr" }, [this](std::string path) {
+            std::thread([this, path] {
+                BT_SetTerminate();
+                presets->export_ppbr(path, {});
+                App::I->message_box("Export PPBR", "Brushes exported to:\n" + path);
+                }).detach();
+            });
+#endif
+        dialog->destroy();
+    };
+}