Repo created

srcs/juloo.keyboard2/ClipboardHistoryService.java

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+package juloo.keyboard2;
+
+import android.content.ClipData;
+import android.content.ClipboardManager;
+import android.content.Context;
+import android.os.Build.VERSION;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+public final class ClipboardHistoryService
+{
+  /** Start the service on startup and start listening to clipboard changes. */
+  public static void on_startup(Context ctx, ClipboardPasteCallback cb)
+  {
+    get_service(ctx);
+    _paste_callback = cb;
+  }
+
+  /** Start the service if it hasn't been started before. Returns [null] if the
+      feature is unsupported. */
+  public static ClipboardHistoryService get_service(Context ctx)
+  {
+    if (VERSION.SDK_INT <= 11)
+      return null;
+    if (_service == null)
+      _service = new ClipboardHistoryService(ctx);
+    return _service;
+  }
+
+  public static void set_history_enabled(boolean e)
+  {
+    Config.globalConfig().set_clipboard_history_enabled(e);
+    if (_service == null)
+      return;
+    if (e)
+      _service.add_current_clip();
+    else
+      _service.clear_history();
+  }
+
+  /** Send the given string to the editor. */
+  public static void paste(String clip)
+  {
+    if (_paste_callback != null)
+      _paste_callback.paste_from_clipboard_pane(clip);
+  }
+
+  /** The maximum size limits the amount of user data stored in memory but also
+      gives a sense to the user that the history is not persisted and can be
+      forgotten as soon as the app stops. */
+  public static final int MAX_HISTORY_SIZE = 6;
+  /** Time in ms until history entries expire. */
+  public static final long HISTORY_TTL_MS = 5 * 60 * 1000;
+
+  static ClipboardHistoryService _service = null;
+  static ClipboardPasteCallback _paste_callback = null;
+
+  ClipboardManager _cm;
+  List<HistoryEntry> _history;
+  OnClipboardHistoryChange _listener = null;
+
+  ClipboardHistoryService(Context ctx)
+  {
+    _history = new ArrayList<HistoryEntry>();
+    _cm = (ClipboardManager)ctx.getSystemService(Context.CLIPBOARD_SERVICE);
+    _cm.addPrimaryClipChangedListener(this.new SystemListener());
+  }
+
+  public List<String> clear_expired_and_get_history()
+  {
+    long now_ms = System.currentTimeMillis();
+    List<String> dst = new ArrayList<String>();
+    Iterator<HistoryEntry> it = _history.iterator();
+    while (it.hasNext())
+    {
+      HistoryEntry ent = it.next();
+      if (ent.expiry_timestamp <= now_ms)
+        it.remove();
+      else
+        dst.add(ent.content);
+    }
+    return dst;
+  }
+
+  /** This will call [on_clipboard_history_change]. */
+  public void remove_history_entry(String clip)
+  {
+    int last_pos = _history.size() - 1;
+    for (int pos = last_pos; pos >= 0; pos--)
+    {
+      if (!_history.get(pos).content.equals(clip))
+        continue;
+      // Removing the current clipboard, clear the system clipboard.
+      if (pos == last_pos)
+      {
+        if (VERSION.SDK_INT >= 28)
+          _cm.clearPrimaryClip();
+        else
+          _cm.setText("");
+      }
+      _history.remove(pos);
+      if (_listener != null)
+        _listener.on_clipboard_history_change();
+    }
+  }
+
+  /** Add clipboard entries to the history, skipping consecutive duplicates and
+      empty strings. */
+  public void add_clip(String clip)
+  {
+    if (!Config.globalConfig().clipboard_history_enabled)
+      return;
+    int size = _history.size();
+    if (clip.equals("") || (size > 0 && _history.get(size - 1).content.equals(clip)))
+      return;
+    if (size >= MAX_HISTORY_SIZE)
+      _history.remove(0);
+    _history.add(new HistoryEntry(clip));
+    if (_listener != null)
+      _listener.on_clipboard_history_change();
+  }
+
+  public void clear_history()
+  {
+    _history.clear();
+    if (_listener != null)
+      _listener.on_clipboard_history_change();
+  }
+
+  public void set_on_clipboard_history_change(OnClipboardHistoryChange l) { _listener = l; }
+
+  public static interface OnClipboardHistoryChange
+  {
+    public void on_clipboard_history_change();
+  }
+
+  /** Add what is currently in the system clipboard into the history. */
+  void add_current_clip()
+  {
+    ClipData clip = _cm.getPrimaryClip();
+    if (clip == null)
+      return;
+    int count = clip.getItemCount();
+    for (int i = 0; i < count; i++)
+    {
+      CharSequence text = clip.getItemAt(i).getText();
+      if (text != null)
+        add_clip(text.toString());
+    }
+  }
+
+  final class SystemListener implements ClipboardManager.OnPrimaryClipChangedListener
+  {
+    public SystemListener() {}
+
+    @Override
+    public void onPrimaryClipChanged()
+    {
+      add_current_clip();
+    }
+  }
+
+  static final class HistoryEntry
+  {
+    public final String content;
+
+    /** Time at which the entry expires. */
+    public final long expiry_timestamp;
+
+    public HistoryEntry(String c)
+    {
+      content = c;
+      expiry_timestamp = System.currentTimeMillis() + HISTORY_TTL_MS;
+    }
+  }
+
+  public interface ClipboardPasteCallback
+  {
+    public void paste_from_clipboard_pane(String content);
+  }
+}