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// 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.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwtexpui.safehtml.client.SafeHtml;
import com.google.gwtexpui.safehtml.client.SafeHtmlBuilder;
public abstract class KeyCommand implements KeyPressHandler {
public static final int M_CTRL = 1 << 16;
public static final int M_ALT = 2 << 16;
public static final int M_META = 4 << 16;
public static boolean same(final KeyCommand a, final KeyCommand b) {
return a.getClass() == b.getClass() && a.helpText.equals(b.helpText);
}
final int keyMask;
private final String helpText;
public KeyCommand(final int mask, final int key, final String help) {
this(mask, (char) key, help);
}
public KeyCommand(final int mask, final char key, final String help) {
assert help != null;
keyMask = mask | key;
helpText = help;
}
public String getHelpText() {
return helpText;
}
SafeHtml describeKeyStroke() {
final SafeHtmlBuilder b = new SafeHtmlBuilder();
if ((keyMask & M_CTRL) == M_CTRL) {
modifier(b, KeyConstants.I.keyCtrl());
}
if ((keyMask & M_ALT) == M_ALT) {
modifier(b, KeyConstants.I.keyAlt());
}
if ((keyMask & M_META) == M_META) {
modifier(b, KeyConstants.I.keyMeta());
}
final char c = (char) (keyMask & 0xffff);
switch (c) {
case KeyCodes.KEY_ENTER:
namedKey(b, KeyConstants.I.keyEnter());
break;
case KeyCodes.KEY_ESCAPE:
namedKey(b, KeyConstants.I.keyEsc());
break;
default:
b.openSpan();
b.setStyleName(KeyResources.I.css().helpKey());
b.append(String.valueOf(c));
b.closeSpan();
break;
}
return b;
}
private void modifier(final SafeHtmlBuilder b, final String name) {
namedKey(b, name);
b.append(" + ");
}
private void namedKey(final SafeHtmlBuilder b, final String name) {
b.append('<');
b.openSpan();
b.setStyleName(KeyResources.I.css().helpKey());
b.append(name);
b.closeSpan();
b.append(">");
}
}
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