1 files changed, 191 insertions, 0 deletions
diff --git a/java/com/google/gwtexpui/globalkey/client/GlobalKey.java b/java/com/google/gwtexpui/globalkey/client/GlobalKey.java
new file mode 100644
index 0000000000..cbaca61658
--- /dev/null
+++ b/java/com/google/gwtexpui/globalkey/client/GlobalKey.java
@@ -0,0 +1,191 @@
+// Copyright (C) 2009 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gwtexpui.globalkey.client;
+
+import com.google.gwt.event.dom.client.DomEvent;
+import com.google.gwt.event.dom.client.KeyCodes;
+import com.google.gwt.event.dom.client.KeyDownEvent;
+import com.google.gwt.event.dom.client.KeyDownHandler;
+import com.google.gwt.event.dom.client.KeyPressEvent;
+import com.google.gwt.event.dom.client.KeyPressHandler;
+import com.google.gwt.event.logical.shared.CloseEvent;
+import com.google.gwt.event.logical.shared.CloseHandler;
+import com.google.gwt.event.shared.HandlerRegistration;
+import com.google.gwt.user.client.Timer;
+import com.google.gwt.user.client.ui.PopupPanel;
+import com.google.gwt.user.client.ui.Widget;
+
+public class GlobalKey {
+  public static final KeyPressHandler STOP_PROPAGATION = DomEvent::stopPropagation;
+
+  private static State global;
+  static State active;
+  private static CloseHandler<PopupPanel> restoreGlobal;
+  private static Timer restoreTimer;
+
+  static {
+    KeyResources.I.css().ensureInjected();
+  }
+
+  private static void initEvents() {
+    if (active == null) {
+      DocWidget.get()
+          .addKeyPressHandler(
+              new KeyPressHandler() {
+                @Override
+                public void onKeyPress(KeyPressEvent event) {
+                  final KeyCommandSet s = active.live;
+                  if (s != active.all) {
+                    active.live = active.all;
+                    restoreTimer.cancel();
+                  }
+                  s.onKeyPress(event);
+                }
+              });
+
+      restoreTimer =
+          new Timer() {
+            @Override
+            public void run() {
+              active.live = active.all;
+            }
+          };
+
+      global = new State(null);
+      active = global;
+    }
+  }
+
+  private static void initDialog() {
+    if (restoreGlobal == null) {
+      restoreGlobal =
+          new CloseHandler<PopupPanel>() {
+            @Override
+            public void onClose(CloseEvent<PopupPanel> event) {
+              active = global;
+            }
+          };
+    }
+  }
+
+  static void temporaryWithTimeout(KeyCommandSet s) {
+    active.live = s;
+    restoreTimer.schedule(250);
+  }
+
+  public static void dialog(PopupPanel panel) {
+    initEvents();
+    initDialog();
+    assert panel.isShowing();
+    assert active == global;
+    active = new State(panel);
+    active.add(new HidePopupPanelCommand(0, KeyCodes.KEY_ESCAPE, panel));
+    panel.addCloseHandler(restoreGlobal);
+    panel.addDomHandler(
+        new KeyDownHandler() {
+          @Override
+          public void onKeyDown(KeyDownEvent event) {
+            if (event.getNativeKeyCode() == KeyCodes.KEY_ESCAPE) {
+              panel.hide();
+            }
+          }
+        },
+        KeyDownEvent.getType());
+  }
+
+  public static HandlerRegistration addApplication(Widget widget, KeyCommand appKey) {
+    initEvents();
+    final State state = stateFor(widget);
+    state.add(appKey);
+    return new HandlerRegistration() {
+      @Override
+      public void removeHandler() {
+        state.remove(appKey);
+      }
+    };
+  }
+
+  public static HandlerRegistration add(Widget widget, KeyCommandSet cmdSet) {
+    initEvents();
+    final State state = stateFor(widget);
+    state.add(cmdSet);
+    return new HandlerRegistration() {
+      @Override
+      public void removeHandler() {
+        state.remove(cmdSet);
+      }
+    };
+  }
+
+  private static State stateFor(Widget w) {
+    while (w != null) {
+      if (w == active.root) {
+        return active;
+      }
+      w = w.getParent();
+    }
+    return global;
+  }
+
+  public static void filter(KeyCommandFilter filter) {
+    active.filter(filter);
+    if (active != global) {
+      global.filter(filter);
+    }
+  }
+
+  private GlobalKey() {}
+
+  static class State {
+    final Widget root;
+    final KeyCommandSet app;
+    final KeyCommandSet all;
+    KeyCommandSet live;
+
+    State(Widget r) {
+      root = r;
+
+      app = new KeyCommandSet(KeyConstants.I.applicationSection());
+      app.add(ShowHelpCommand.INSTANCE);
+
+      all = new KeyCommandSet();
+      all.add(app);
+
+      live = all;
+    }
+
+    void add(KeyCommand k) {
+      app.add(k);
+      all.add(k);
+    }
+
+    void remove(KeyCommand k) {
+      app.remove(k);
+      all.remove(k);
+    }
+
+    void add(KeyCommandSet s) {
+      all.add(s);
+    }
+
+    void remove(KeyCommandSet s) {
+      all.remove(s);
+    }
+
+    void filter(KeyCommandFilter f) {
+      all.filter(f);
+    }
+  }
+}