com.google.gwt.user.client.ui.impl.TextBoxImplIE8 Maven / Gradle / Ivy
/*
* Copyright 2007 Google Inc.
*
* 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.gwt.user.client.ui.impl;
import com.google.gwt.dom.client.Element;
/**
* IE8-specific implementation of
* {@link com.google.gwt.user.client.ui.impl.TextBoxImpl}.
*/
public class TextBoxImplIE8 extends TextBoxImpl {
@Override
public native int getCursorPos(Element elem) /*-{
try {
var tr = elem.document.selection.createRange();
if (tr.parentElement() !== elem)
return -1;
return -tr.move("character", -65535);
}
catch (e) {
return 0;
}
}-*/;
@Override
public native int getSelectionLength(Element elem) /*-{
try {
var tr = elem.document.selection.createRange();
if (tr.parentElement() !== elem)
return 0;
return tr.text.length;
}
catch (e) {
return 0;
}
}-*/;
/**
* The text reported in the text range does not include newline characters at
* the end of the selection. So, we need to create 2 ranges and subtract a
* character from one until the lengths are different. At that point, we know
* exactly how many \r\n were truncated from the selection.
*/
@Override
public native int getTextAreaCursorPos(Element elem) /*-{
try {
var tr = elem.document.selection.createRange();
if (tr.parentElement() !== elem)
return -1;
var tr2 = tr.duplicate();
tr2.moveToElementText(elem);
tr2.setEndPoint('EndToStart', tr);
var tr2Length = tr2.text.length;
// Subtract characters from the end to account for trimmed newlines.
var offset = 0;
var tr3 = tr2.duplicate();
tr3.moveEnd('character', -1);
var tr3Length = tr3.text.length;
while (tr3Length == tr2Length && tr3.parentElement() == elem) {
offset += 2;
tr3.moveEnd('character', -1);
tr3Length = tr3.text.length;
}
return tr2Length + offset;
}
catch (e) {
return 0;
}
}-*/;
@Override
public native int getTextAreaSelectionLength(Element elem) /*-{
try {
var tr = elem.document.selection.createRange();
if (tr.parentElement() !== elem)
return 0;
var trLength = tr.text.length;
// Subtract characters from the end to account for trimmed newlines.
var offset = 0;
var tr2 = tr.duplicate();
tr2.moveEnd('character', -1);
var tr2Length = tr2.text.length;
while (tr2Length == trLength && tr2.parentElement() == elem && tr.compareEndPoints('StartToEnd', tr2) <= 0) {
offset += 2;
tr2.moveEnd('character', -1);
tr2Length = tr2.text.length;
}
return trLength + offset;
}
catch (e) {
return 0;
}
}-*/;
/**
* Moving the start 1 character will move across a \r\n, but \r\n counts as
* two characters, so we need to offset the position accordingly.
*/
@Override
public native void setSelectionRange(Element elem, int pos, int length) /*-{
try {
var tr = elem.createTextRange();
var newlinesWithin = elem.value.substr(pos, length).match(/(\r\n)/gi);
if (newlinesWithin != null) {
length -= newlinesWithin.length;
}
var newlinesBefore = elem.value.substring(0, pos).match(/(\r\n)/gi);
if (newlinesBefore != null) {
pos -= newlinesBefore.length;
}
tr.collapse(true);
tr.moveStart('character', pos);
tr.moveEnd('character', length);
tr.select();
}
catch (e) {
}
}-*/;
}