From 4f2174c82dbd65b161083fe337fe2a33172a7a0b Mon Sep 17 00:00:00 2001
From: kevin <kevin@larke.org>
Date: Sat, 21 Sep 2024 17:18:12 -0400
Subject: [PATCH] cwIo.h/cpp, cwUi.h/cpp : Added emptyParent().

---
 cwIo.cpp | 10 ++++++++++
 cwIo.h   |  3 ++-
 cwUi.cpp | 27 +++++++++++++++++++++++++++
 cwUi.h   |  1 +
 4 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/cwIo.cpp b/cwIo.cpp
index 4c9c471..341df42 100644
--- a/cwIo.cpp
+++ b/cwIo.cpp
@@ -3843,6 +3843,16 @@ cw::rc_t cw::io::uiSetLogLine(     handle_t h, unsigned uuId, const char* text )
     rc = ui::setLogLine(uiH,uuId,text);
   return rc;
 }
+
+cw::rc_t cw::io::uiEmptyParent(  handle_t h, unsigned uuId)
+{
+  rc_t         rc;
+  ui::handle_t uiH;
+  if((rc = _handleToUiHandle(h,uiH)) == kOkRC )
+    rc = ui::emptyParent(uiH,uuId);
+  return rc;
+}
+
     
 cw::rc_t cw::io::uiSetClickable(   handle_t h, unsigned uuId, bool clickableFl )
 {
diff --git a/cwIo.h b/cwIo.h
index 39e522b..ef345a0 100644
--- a/cwIo.h
+++ b/cwIo.h
@@ -386,7 +386,8 @@ namespace cw
 
     rc_t uiSetNumbRange( handle_t h, unsigned uuId, double minValue, double maxValue, double stepValue, unsigned decPl, double value );
     rc_t uiSetProgRange( handle_t h, unsigned uuId, double minValue, double maxValue, double value );
-    rc_t uiSetLogLine(     handle_t h, unsigned uuId, const char* text );
+    rc_t uiSetLogLine(   handle_t h, unsigned uuId, const char* text );
+    rc_t uiEmptyParent(  handle_t h, unsigned uuId); // empty a list or select of all children
     
     rc_t uiSetClickable(   handle_t h, unsigned uuId, bool clickableFl=true );
     rc_t uiClearClickable( handle_t h, unsigned uuId );
diff --git a/cwUi.cpp b/cwUi.cpp
index a81c02a..ac59c39 100644
--- a/cwUi.cpp
+++ b/cwUi.cpp
@@ -1951,6 +1951,33 @@ cw::rc_t cw::ui::setLogLine(   handle_t h, unsigned uuId, const char* text )
   return rc;
 }
 
+cw::rc_t cw::ui::emptyParent(    handle_t h, unsigned uuId )
+{
+
+  ui_t* p = _handleToPtr(h);
+  rc_t rc = kOkRC;
+  
+  const char* mFmt = "{ \"op\":\"empty\", \"uuId\":%i }";
+  const int   mbufN = 256;
+  char        mbuf[mbufN];
+      
+  if( snprintf(mbuf,mbufN,mFmt,uuId) >= mbufN-1 )
+  {
+    rc = cwLogError(kBufTooSmallRC,"The msg buffer is too small for 'empty' msg.");
+    goto errLabel;
+  }
+  
+  if((rc = _websockSend(p,kInvalidId,mbuf)) != kOkRC )
+  {
+    cwLogError(rc,"'empty' msg transmit failed.");
+    goto errLabel;
+  }
+
+errLabel:
+  return rc;
+}
+
+
 cw::rc_t cw::ui::setClickable( handle_t h, unsigned uuId, bool clickableFl )
 { return _setPropertyFlag( h, UI_CLICKABLE_LABEL, uuId, clickableFl ); }
 
diff --git a/cwUi.h b/cwUi.h
index 58ef92d..3fd01f9 100644
--- a/cwUi.h
+++ b/cwUi.h
@@ -130,6 +130,7 @@ namespace cw
     rc_t setNumbRange(   handle_t h, unsigned uuId, double minValue, double maxValue, double stepValue, unsigned decPl, double value );
     rc_t setProgRange(   handle_t h, unsigned uuId, double minValue, double maxValue, double value );
     rc_t setLogLine(     handle_t h, unsigned uuId, const char* text );
+    rc_t emptyParent(    handle_t h, unsigned uuId );
     
     rc_t setClickable(   handle_t h, unsigned uuId, bool clickableFl=true );
     rc_t clearClickable( handle_t h, unsigned uuId );