From ac063e2bd64cc6e760a8101cd9190bb9d1746778 Mon Sep 17 00:00:00 2001
From: hneemann <helmut.neemann@arcor.de>
Date: Thu, 31 May 2018 16:16:52 +0200
Subject: [PATCH] limits the menu size in the component menu. Closes #152

---
 .../draw/library/ElementLibraryFolder.java    | 50 +++++++++++++++++--
 1 file changed, 46 insertions(+), 4 deletions(-)

diff --git a/src/main/java/de/neemann/digital/draw/library/ElementLibraryFolder.java b/src/main/java/de/neemann/digital/draw/library/ElementLibraryFolder.java
index de485b80e..40a3dd0ae 100644
--- a/src/main/java/de/neemann/digital/draw/library/ElementLibraryFolder.java
+++ b/src/main/java/de/neemann/digital/draw/library/ElementLibraryFolder.java
@@ -5,6 +5,7 @@
  */
 package de.neemann.digital.draw.library;
 
+import de.neemann.digital.lang.Lang;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -18,14 +19,14 @@ import java.util.Arrays;
 public class ElementLibraryFolder {
     private static final Logger LOGGER = LoggerFactory.getLogger(ElementLibraryFolder.class);
     private static final int MAX_FILES_TO_SCAN = 5000;
+    private static final int MAX_MENU_SIZE = 12;
 
     private final LibraryNode root;
     private final String menuTitle;
     private LibraryNode node;
-    private File lastPath;
 
     /**
-     * create a new folder manager
+     * Create a new folder manager.
      *
      * @param root      the root node
      * @param menuTitle string to show in menu
@@ -43,7 +44,7 @@ public class ElementLibraryFolder {
     }
 
     /**
-     * scans the given folder
+     * Scans the given folder
      *
      * @param path      the path to scan
      * @param isLibrary true if this is the library
@@ -84,17 +85,58 @@ public class ElementLibraryFolder {
                         node.add(n);
                 }
             }
+
+            ArrayList<File> fileList = new ArrayList<>();
             for (File f : orderedList) {
                 scanCounter.incFile();
                 final String name = f.getName();
                 if (f.isFile() && name.endsWith(".dig")) {
-                    node.add(new LibraryNode(f, isLibrary));
+                    fileList.add(f);
                     scanCounter.incCircuit();
                 }
             }
+
+            if (fileList.size() <= MAX_MENU_SIZE + 1) {
+                for (File f : fileList)
+                    node.add(new LibraryNode(f, isLibrary));
+            } else {
+                for (int i = 0; i < MAX_MENU_SIZE; i++)
+                    node.add(new LibraryNode(fileList.get(i), isLibrary));
+
+                final int size = fileList.size() - MAX_MENU_SIZE;
+                int subMenus = (size - 1) / MAX_MENU_SIZE + 1;
+                int delta = (size - 1) / subMenus + 1;
+
+                int pos = MAX_MENU_SIZE;
+                while (pos < fileList.size()) {
+                    int pos2 = pos + delta;
+                    if (pos2 > fileList.size())
+                        pos2 = fileList.size();
+
+                    String name;
+                    if (subMenus > 1)
+                        name = clean(fileList.get(pos)) + " - " + clean(fileList.get(pos2 - 1));
+                    else
+                        name = Lang.get("lib_more");
+
+                    LibraryNode n = new LibraryNode(name);
+                    node.add(n);
+                    for (int p = pos; p < pos2; p++)
+                        n.add(new LibraryNode(fileList.get(p), isLibrary));
+
+                    pos = pos2;
+                }
+            }
         }
     }
 
+    private static String clean(File file) {
+        String s = file.getName();
+        if (s.endsWith(".dig"))
+            s = s.substring(0, s.length() - 4);
+        return s;
+    }
+
     private static final class ScanCounter {
         private int fileCounter;
         private int circuitCounter;