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- /*
- * Copyright 2000-2013 Vaadin Ltd.
- *
- * 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.vaadin.client.ui;
-
- import com.google.gwt.core.client.Scheduler;
- import com.google.gwt.dom.client.Element;
- import com.google.gwt.dom.client.Style.Overflow;
- import com.google.gwt.dom.client.Style.WhiteSpace;
- import com.google.gwt.dom.client.TextAreaElement;
- import com.google.gwt.event.dom.client.ChangeEvent;
- import com.google.gwt.event.dom.client.ChangeHandler;
- import com.google.gwt.event.dom.client.KeyDownEvent;
- import com.google.gwt.event.dom.client.KeyUpEvent;
- import com.google.gwt.event.dom.client.KeyUpHandler;
- import com.google.gwt.user.client.Command;
- import com.google.gwt.user.client.DOM;
- import com.google.gwt.user.client.Event;
- import com.vaadin.client.BrowserInfo;
- import com.vaadin.client.Util;
- import com.vaadin.client.ui.dd.VDragCloneAware;
-
- /**
- * This class represents a multiline textfield (textarea).
- *
- * TODO consider replacing this with a RichTextArea based implementation. IE
- * does not support CSS height for textareas in Strict mode :-(
- *
- * @author Vaadin Ltd.
- *
- */
- public class VTextArea extends VTextField implements VDragCloneAware {
- public static final String CLASSNAME = "v-textarea";
- private boolean wordwrap = true;
- private MaxLengthHandler maxLengthHandler = new MaxLengthHandler();
- private boolean browserSupportsMaxLengthAttribute = browserSupportsMaxLengthAttribute();
-
- public VTextArea() {
- super(DOM.createTextArea());
- setStyleName(CLASSNAME);
- if (!browserSupportsMaxLengthAttribute) {
- addKeyUpHandler(maxLengthHandler);
- addChangeHandler(maxLengthHandler);
- sinkEvents(Event.ONPASTE);
- }
- }
-
- public TextAreaElement getTextAreaElement() {
- return super.getElement().cast();
- }
-
- public void setRows(int rows) {
- getTextAreaElement().setRows(rows);
- }
-
- @Override
- public void setSelectionRange(int pos, int length) {
- super.setSelectionRange(pos, length);
- final String value = getValue();
- /*
- * Align position to index inside string value
- */
- int index = pos;
- if (index < 0) {
- index = 0;
- }
- if (index > value.length()) {
- index = value.length();
- }
- // Get pixels count required to scroll textarea vertically
- int scrollTop = getScrollTop(value, index);
- int scrollLeft = -1;
- /*
- * Check if textarea has wrap attribute set to "off". In the latter case
- * horizontal scroll is also required.
- */
- if (!isWordwrap()) {
- // Get pixels count required to scroll textarea horizontally
- scrollLeft = getScrollLeft(value, index);
- }
- // Set back original text if previous methods calls changed it
- if (!isWordwrap() || index < value.length()) {
- setValue(value, false);
- }
- /*
- * Call original method to set cursor position. In most browsers it
- * doesn't lead to scrolling.
- */
- super.setSelectionRange(pos, length);
- /*
- * Align vertical scroll to middle of textarea view (height) if
- * scrolling is reqiured at all.
- */
- if (scrollTop > 0) {
- scrollTop += getElement().getClientHeight() / 2;
- }
- /*
- * Align horizontal scroll to middle of textarea view (widht) if
- * scrolling is reqiured at all.
- */
- if (scrollLeft > 0) {
- scrollLeft += getElement().getClientWidth() / 2;
- }
- /*
- * Scroll if computed scrollTop is greater than scroll after cursor
- * setting
- */
- if (getElement().getScrollTop() < scrollTop) {
- getElement().setScrollTop(scrollTop);
- }
- /*
- * Scroll if computed scrollLeft is greater than scroll after cursor
- * setting
- */
- if (getElement().getScrollLeft() < scrollLeft) {
- getElement().setScrollLeft(scrollLeft);
- }
- }
-
- /*
- * Get horizontal scroll value required to get position visible. Method is
- * called only when text wrapping is off. There is need to scroll
- * horizontally in case words are wrapped.
- */
- private int getScrollLeft(String value, int index) {
- String beginning = value.substring(0, index);
- // Compute beginning of the current line
- int begin = beginning.lastIndexOf('\n');
- String line = value.substring(begin + 1);
- index = index - begin - 1;
- if (index < line.length()) {
- index++;
- }
- line = line.substring(0, index);
- /*
- * Now <code>line</code> contains current line up to index position
- */
- setValue(line.trim(), false); // Set this line to the textarea.
- /*
- * Scroll textarea up to the end of the line (maximum possible
- * horizontal scrolling value). Now the end line becomes visible.
- */
- getElement().setScrollLeft(getElement().getScrollWidth());
- // Return resulting horizontal scrolling value.
- return getElement().getScrollLeft();
- }
-
- /*
- * Get vertical scroll value required to get position visible
- */
- private int getScrollTop(String value, int index) {
- /*
- * Trim text after position and set this trimmed text if index is not
- * very end.
- */
- if (index < value.length()) {
- String beginning = value.substring(0, index);
- setValue(beginning, false);
- }
- /*
- * Now textarea contains trimmed text and could be scrolled up to the
- * top. Scroll it to maximum possible value to get end of the text
- * visible.
- */
- getElement().setScrollTop(getElement().getScrollHeight());
- // Return resulting vertical scrolling value.
- return getElement().getScrollTop();
- }
-
- private class MaxLengthHandler implements KeyUpHandler, ChangeHandler {
-
- @Override
- public void onKeyUp(KeyUpEvent event) {
- enforceMaxLength();
- }
-
- public void onPaste(Event event) {
- enforceMaxLength();
- }
-
- @Override
- public void onChange(ChangeEvent event) {
- // Opera does not support paste events so this enforces max length
- // for Opera.
- enforceMaxLength();
- }
-
- }
-
- protected void enforceMaxLength() {
- if (getMaxLength() >= 0) {
- Scheduler.get().scheduleDeferred(new Command() {
- @Override
- public void execute() {
- if (getText().length() > getMaxLength()) {
- setText(getText().substring(0, getMaxLength()));
- }
- }
- });
- }
- }
-
- protected boolean browserSupportsMaxLengthAttribute() {
- BrowserInfo info = BrowserInfo.get();
- if (info.isFirefox() && info.isBrowserVersionNewerOrEqual(4, 0)) {
- return true;
- }
- if (info.isSafari() && info.isBrowserVersionNewerOrEqual(5, 0)) {
- return true;
- }
- if (info.isIE() && info.isBrowserVersionNewerOrEqual(10, 0)) {
- return true;
- }
- if (info.isAndroid() && info.isBrowserVersionNewerOrEqual(2, 3)) {
- return true;
- }
- return false;
- }
-
- @Override
- protected void updateMaxLength(int maxLength) {
- if (browserSupportsMaxLengthAttribute) {
- super.updateMaxLength(maxLength);
- } else {
- // Events handled by MaxLengthHandler. This call enforces max length
- // when the max length value has changed
- enforceMaxLength();
- }
- }
-
- @Override
- public void onBrowserEvent(Event event) {
- super.onBrowserEvent(event);
- if (event.getTypeInt() == Event.ONPASTE) {
- maxLengthHandler.onPaste(event);
- }
- }
-
- @Override
- public int getCursorPos() {
- // This is needed so that TextBoxImplIE6 is used to return the correct
- // position for old Internet Explorer versions where it has to be
- // detected in a different way.
- return getImpl().getTextAreaCursorPos(getElement());
- }
-
- @Override
- protected void setMaxLengthToElement(int newMaxLength) {
- // There is no maxlength property for textarea. The maximum length is
- // enforced by the KEYUP handler
-
- }
-
- public void setWordwrap(boolean wordwrap) {
- if (wordwrap == this.wordwrap) {
- return; // No change
- }
-
- if (wordwrap) {
- getElement().removeAttribute("wrap");
- getElement().getStyle().clearOverflow();
- getElement().getStyle().clearWhiteSpace();
- } else {
- getElement().setAttribute("wrap", "off");
- getElement().getStyle().setOverflow(Overflow.AUTO);
- getElement().getStyle().setWhiteSpace(WhiteSpace.PRE);
- }
- if (BrowserInfo.get().isOpera()
- || (BrowserInfo.get().isWebkit() && wordwrap)) {
- // Opera fails to dynamically update the wrap attribute so we detach
- // and reattach the whole TextArea.
- // Webkit fails to properly reflow the text when enabling wrapping,
- // same workaround
- Util.detachAttach(getElement());
- }
- this.wordwrap = wordwrap;
- }
-
- @Override
- public void onKeyDown(KeyDownEvent event) {
- // Overridden to avoid submitting TextArea value on enter in IE. This is
- // another reason why widgets should inherit a common abstract
- // class instead of directly each other.
- }
-
- @Override
- public void initDragImageCopy(Element element) {
- // Fix for #13557 - drag image doesn't show original text area text.
- // It happens because "value" property is not copied into the cloned
- // element
- String value = getElement().getPropertyString("value");
- if (value != null) {
- element.setPropertyString("value", value);
- }
- }
-
- }
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