/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.waveprotocol.wave.client.editor.debug;
import com.google.gwt.dom.client.DivElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Style.Position;
import com.google.gwt.dom.client.Style.Unit;
import org.waveprotocol.wave.client.common.util.OffsetPosition;
import org.waveprotocol.wave.client.editor.EditorImpl;
import org.waveprotocol.wave.client.editor.EditorStaticDeps;
import org.waveprotocol.wave.client.editor.EditorUpdateEvent;
import org.waveprotocol.wave.client.editor.selection.html.NativeSelectionUtil;
/**
* Visual indication of selection in terms of offsetTop, offsetLeft for debug
* purposes.
*
*
*/
class CursorDisplay implements EditorUpdateEvent.EditorUpdateListener {
private final DivElement DEBUG_CURSOR = Document.get().createDivElement();
private boolean enabled = false;
private final EditorImpl editorImpl;
CursorDisplay(EditorImpl editorImpl) {
this.editorImpl = editorImpl;
DEBUG_CURSOR.setInnerText("o");
DEBUG_CURSOR.getStyle().setZIndex(1000);
DEBUG_CURSOR.getStyle().setPosition(Position.ABSOLUTE);
}
/**
* @return true iff the cursor is enabled.
*/
boolean getEnabled() {
return enabled ;
}
/**
* Turn on/off the cursor display.
* @param enabled
*/
void setEnabled(boolean enabled) {
if (enabled) {
editorImpl.addUpdateListener(this);
} else {
editorImpl.removeUpdateListener(this);
DEBUG_CURSOR.removeFromParent();
}
this.enabled = enabled;
}
@Override
public void onUpdate(EditorUpdateEvent event) {
OffsetPosition p = NativeSelectionUtil.slowGetPosition();
if (p != null) {
EditorStaticDeps.logger.trace().log("x: " + p.left + "y: " + p.top);
if (p.offsetParent == null) {
// If offsetParent is null, interpret offsetX and offsetY as
// absolute positions
if (DEBUG_CURSOR.getParentElement() != Document.get().getBody()) {
Document.get().getBody().appendChild(DEBUG_CURSOR);
}
DEBUG_CURSOR.getStyle().setTop(p.top - Document.get().getBody().getAbsoluteTop(), Unit.PX);
DEBUG_CURSOR.getStyle().setLeft(p.left - Document.get().getBody().getAbsoluteLeft(),
Unit.PX);
} else {
if (editorImpl.getElement() != null
&& DEBUG_CURSOR.getParentElement() != editorImpl.getElement()) {
editorImpl.getElement().appendChild(DEBUG_CURSOR);
}
DEBUG_CURSOR.getStyle().setTop(p.top, Unit.PX);
DEBUG_CURSOR.getStyle().setLeft(p.left, Unit.PX);
}
}
}
}