From a7f3c4d2662929b7bd35dda2279bf5129a899d58 Mon Sep 17 00:00:00 2001
From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Sun, 7 Sep 2014 13:43:48 +0200
Subject: [PATCH] Call DoEvents during time-consuming operations

Processing of a game file for reading it, searching positions, saving
selected games or creating a book from them can take minutes. To keep
the application responsive during that time, the main loops of those
tasks calls DoEvents(). A possible risk is that the user can now do
too much, and will initiate actions that interfere with the tast in
progress.
---
 backend.c            |    3 ++-
 gamelist.c           |    2 +-
 ngamelist.c          |    2 +-
 winboard/wgamelist.c |    2 +-
 4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/backend.c b/backend.c
index 948081f..36eca33 100644
--- a/backend.c
+++ b/backend.c
@@ -15851,7 +15851,7 @@ SaveSelected (FILE *g, int dummy, char *dummy2)
 	if(lg->position >= 0) { // selected?
 	    LoadGame(f, nItem, "", TRUE);
 	    SaveGamePGN2(g); // leaves g open
-	    cnt++;
+	    cnt++; DoEvents();
 	}
         lg = (ListGame *) lg->node.succ;
     }
@@ -15890,6 +15890,7 @@ CreateBookEvent ()
 	if(lg->position >= 0) {
 	    LoadGame(f, nItem, "", TRUE);
 	    AddGameToBook(TRUE);
+	    DoEvents();
 	}
         lg = (ListGame *) lg->node.succ;
     }
diff --git a/gamelist.c b/gamelist.c
index 62b4e83..2055e96 100644
--- a/gamelist.c
+++ b/gamelist.c
@@ -373,7 +373,7 @@ GameListBuild (FILE *f)
 	}
 	if(gameNumber % 1000 == 0) {
 	    snprintf(buf, MSG_SIZ, _("Reading game file (%d)"), gameNumber);
-	    DisplayTitle(buf);
+	    DisplayTitle(buf); DoEvents();
 	}
     }
     while (cm != (ChessMove) 0);
diff --git a/ngamelist.c b/ngamelist.c
index 43de988..b415d19 100644
--- a/ngamelist.c
+++ b/ngamelist.c
@@ -190,7 +190,7 @@ GameListPrepare (int byPos, int narrow)
 	if(lg->number % 2000 == 0) {
 	    char buf[MSG_SIZ];
 	    snprintf(buf, MSG_SIZ, _("Scanning through games (%d)"), lg->number);
-	    DisplayTitle(buf);
+	    DisplayTitle(buf); DoEvents();
 	}
 	lg->position = pos;
 	lg = (ListGame *) lg->node.succ;
diff --git a/winboard/wgamelist.c b/winboard/wgamelist.c
index 196c837..feda2ca 100644
--- a/winboard/wgamelist.c
+++ b/winboard/wgamelist.c
@@ -95,7 +95,7 @@ static int GameListToListBox( HWND hDlg, BOOL boReset, char * pszFilter, struct
 
         if(nItem % 2000 == 0) {
           snprintf(buf, MSG_SIZ, _("Scanning through games (%d)"), nItem);
-          SetWindowText(hwndMain, buf);
+          SetWindowText(hwndMain, buf); DoEvents();
         }
 
       if(!narrow || lg->position >= 0) {
-- 
1.7.0.4