summaryrefslogtreecommitdiffstats
path: root/WebCore/html/HTMLTextAreaElement.cpp
blob: 0e8350c447659db9fa39e73e55a75fa9b4e8fc0f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
 * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "HTMLTextAreaElement.h"

#include "BeforeTextInsertedEvent.h"
#include "ChromeClient.h"
#include "CSSValueKeywords.h"
#include "Document.h"
#include "Event.h"
#include "EventNames.h"
#include "ExceptionCode.h"
#include "FocusController.h"
#include "FormDataList.h"
#include "Frame.h"
#include "HTMLNames.h"
#include "InputElement.h"
#include "MappedAttribute.h"
#include "Page.h"
#include "RenderStyle.h"
#include "RenderTextControlMultiLine.h"
#include "ScriptEventListener.h"
#include "Text.h"
#include "TextIterator.h"
#include "VisibleSelection.h"
#include <wtf/StdLibExtras.h>

#ifdef ANDROID_ACCEPT_CHANGES_TO_FOCUSED_TEXTFIELDS
#include "WebViewCore.h"
#endif

namespace WebCore {

using namespace HTMLNames;

static const int defaultRows = 2;
static const int defaultCols = 20;

static inline void notifyFormStateChanged(const HTMLTextAreaElement* element)
{
    Frame* frame = element->document()->frame();
    if (!frame)
        return;
    frame->page()->chrome()->client()->formStateDidChange(element);
}

HTMLTextAreaElement::HTMLTextAreaElement(const QualifiedName& tagName, Document* document, HTMLFormElement* form)
    : HTMLTextFormControlElement(tagName, document, form)
    , m_rows(defaultRows)
    , m_cols(defaultCols)
    , m_wrap(SoftWrap)
    , m_cachedSelectionStart(-1)
    , m_cachedSelectionEnd(-1)
    , m_isDirty(false)
{
    ASSERT(hasTagName(textareaTag));
    setFormControlValueMatchesRenderer(true);
    notifyFormStateChanged(this);
}

const AtomicString& HTMLTextAreaElement::formControlType() const
{
    DEFINE_STATIC_LOCAL(const AtomicString, textarea, ("textarea"));
    return textarea;
}

bool HTMLTextAreaElement::saveFormControlState(String& result) const
{
    result = value();
    return true;
}

void HTMLTextAreaElement::restoreFormControlState(const String& state)
{
    setValue(state);
}

void HTMLTextAreaElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
{
    setValue(defaultValue());
    HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
}
    
void HTMLTextAreaElement::parseMappedAttribute(MappedAttribute* attr)
{
    if (attr->name() == rowsAttr) {
        int rows = attr->value().toInt();
        if (rows <= 0)
            rows = defaultRows;
        if (m_rows != rows) {
            m_rows = rows;
            if (renderer())
                renderer()->setNeedsLayoutAndPrefWidthsRecalc();
        }
    } else if (attr->name() == colsAttr) {
        int cols = attr->value().toInt();
        if (cols <= 0)
            cols = defaultCols;
        if (m_cols != cols) {
            m_cols = cols;
            if (renderer())
                renderer()->setNeedsLayoutAndPrefWidthsRecalc();
        }
    } else if (attr->name() == wrapAttr) {
        // The virtual/physical values were a Netscape extension of HTML 3.0, now deprecated.
        // The soft/hard /off values are a recommendation for HTML 4 extension by IE and NS 4.
        WrapMethod wrap;
        if (equalIgnoringCase(attr->value(), "physical") || equalIgnoringCase(attr->value(), "hard") || equalIgnoringCase(attr->value(), "on"))
            wrap = HardWrap;
        else if (equalIgnoringCase(attr->value(), "off"))
            wrap = NoWrap;
        else
            wrap = SoftWrap;
        if (wrap != m_wrap) {
            m_wrap = wrap;

            if (shouldWrapText()) {
                addCSSProperty(attr, CSSPropertyWhiteSpace, CSSValuePreWrap);
                addCSSProperty(attr, CSSPropertyWordWrap, CSSValueBreakWord);
            } else {
                addCSSProperty(attr, CSSPropertyWhiteSpace, CSSValuePre);
                addCSSProperty(attr, CSSPropertyWordWrap, CSSValueNormal);
            }

            if (renderer())
                renderer()->setNeedsLayoutAndPrefWidthsRecalc();
        }
    } else if (attr->name() == accesskeyAttr) {
        // ignore for the moment
    } else if (attr->name() == alignAttr) {
        // Don't map 'align' attribute.  This matches what Firefox, Opera and IE do.
        // See http://bugs.webkit.org/show_bug.cgi?id=7075
    } else
        HTMLTextFormControlElement::parseMappedAttribute(attr);
}

RenderObject* HTMLTextAreaElement::createRenderer(RenderArena* arena, RenderStyle*)
{
    return new (arena) RenderTextControlMultiLine(this, placeholderShouldBeVisible());
}

bool HTMLTextAreaElement::appendFormData(FormDataList& encoding, bool)
{
    if (name().isEmpty())
        return false;

    // FIXME: It's not acceptable to ignore the HardWrap setting when there is no renderer.
    // While we have no evidence this has ever been a practical problem, it would be best to fix it some day.
    RenderTextControl* control = toRenderTextControl(renderer());
    const String& text = (m_wrap == HardWrap && control) ? control->textWithHardLineBreaks() : value();
    encoding.appendData(name(), text);
    return true;
}

void HTMLTextAreaElement::reset()
{
    setValue(defaultValue());
    m_isDirty = false;
}

bool HTMLTextAreaElement::isKeyboardFocusable(KeyboardEvent*) const
{
    // If a given text area can be focused at all, then it will always be keyboard focusable.
    return isFocusable();
}

bool HTMLTextAreaElement::isMouseFocusable() const
{
    return isFocusable();
}

void HTMLTextAreaElement::updateFocusAppearance(bool restorePreviousSelection)
{
    ASSERT(renderer());
    ASSERT(!document()->childNeedsAndNotInStyleRecalc());

    if (!restorePreviousSelection || m_cachedSelectionStart < 0) {
#if ENABLE(ON_FIRST_TEXTAREA_FOCUS_SELECT_ALL)
        // Devices with trackballs or d-pads may focus on a textarea in route
        // to another focusable node. By selecting all text, the next movement
        // can more readily be interpreted as moving to the next node.
        select();
#else
        // If this is the first focus, set a caret at the beginning of the text.  
        // This matches some browsers' behavior; see bug 11746 Comment #15.
        // http://bugs.webkit.org/show_bug.cgi?id=11746#c15
        setSelectionRange(0, 0);
#endif
    } else {
        // Restore the cached selection.  This matches other browsers' behavior.
        setSelectionRange(m_cachedSelectionStart, m_cachedSelectionEnd);
    }

    if (document()->frame())
        document()->frame()->revealSelection();
}

void HTMLTextAreaElement::defaultEventHandler(Event* event)
{
    if (renderer() && (event->isMouseEvent() || event->isDragEvent() || event->isWheelEvent() || event->type() == eventNames().blurEvent))
        toRenderTextControlMultiLine(renderer())->forwardEvent(event);
    else if (renderer() && event->isBeforeTextInsertedEvent())
        handleBeforeTextInsertedEvent(static_cast<BeforeTextInsertedEvent*>(event));

    HTMLFormControlElementWithState::defaultEventHandler(event);
}

void HTMLTextAreaElement::handleBeforeTextInsertedEvent(BeforeTextInsertedEvent* event) const
{
    ASSERT(event);
    ASSERT(renderer());
    int signedMaxLength = maxLength();
    if (signedMaxLength < 0)
        return;
    unsigned unsignedMaxLength = static_cast<unsigned>(signedMaxLength);

    unsigned currentLength = toRenderTextControl(renderer())->text().numGraphemeClusters();
    unsigned selectionLength = plainText(document()->frame()->selection()->selection().toNormalizedRange().get()).numGraphemeClusters();
    ASSERT(currentLength >= selectionLength);
    unsigned baseLength = currentLength - selectionLength;
    unsigned appendableLength = unsignedMaxLength > baseLength ? unsignedMaxLength - baseLength : 0;
    event->setText(sanitizeUserInputValue(event->text(), appendableLength));
}

String HTMLTextAreaElement::sanitizeUserInputValue(const String& proposedValue, unsigned maxLength)
{
    return proposedValue.left(proposedValue.numCharactersInGraphemeClusters(maxLength));
}

void HTMLTextAreaElement::rendererWillBeDestroyed()
{
    updateValue();
}

void HTMLTextAreaElement::updateValue() const
{
    if (formControlValueMatchesRenderer())
        return;

    ASSERT(renderer());
    m_value = toRenderTextControl(renderer())->text();
    const_cast<HTMLTextAreaElement*>(this)->setFormControlValueMatchesRenderer(true);
    notifyFormStateChanged(this);
    m_isDirty = true;
}

String HTMLTextAreaElement::value() const
{
    updateValue();
    return m_value;
}

void HTMLTextAreaElement::setValue(const String& value)
{
    // Code elsewhere normalizes line endings added by the user via the keyboard or pasting.
    // We normalize line endings coming from JavaScript here.
    String normalizedValue = value.isNull() ? "" : value;
    normalizedValue.replace("\r\n", "\n");
    normalizedValue.replace('\r', '\n');

    // Return early because we don't want to move the caret or trigger other side effects
    // when the value isn't changing. This matches Firefox behavior, at least.
    if (normalizedValue == this->value())
        return;

    m_value = normalizedValue;
    setFormControlValueMatchesRenderer(true);
    updatePlaceholderVisibility(false);
    if (inDocument())
        document()->updateStyleIfNeeded();
    if (renderer())
        renderer()->updateFromElement();

    // Set the caret to the end of the text value.
    if (document()->focusedNode() == this) {
#ifdef ANDROID_ACCEPT_CHANGES_TO_FOCUSED_TEXTFIELDS
        // Make sure our UI side textfield changes to match the RenderTextControl
        android::WebViewCore::getWebViewCore(document()->view())->updateTextfield(this, false, value);
#endif
        unsigned endOfString = m_value.length();
        setSelectionRange(endOfString, endOfString);
    }

    setNeedsStyleRecalc();
    notifyFormStateChanged(this);
    updateValidity();
}

String HTMLTextAreaElement::defaultValue() const
{
    String value = "";

    // Since there may be comments, ignore nodes other than text nodes.
    for (Node* n = firstChild(); n; n = n->nextSibling()) {
        if (n->isTextNode())
            value += static_cast<Text*>(n)->data();
    }

    UChar firstCharacter = value[0];
    if (firstCharacter == '\r' && value[1] == '\n')
        value.remove(0, 2);
    else if (firstCharacter == '\r' || firstCharacter == '\n')
        value.remove(0, 1);

    return value;
}

void HTMLTextAreaElement::setDefaultValue(const String& defaultValue)
{
    // To preserve comments, remove only the text nodes, then add a single text node.

    Vector<RefPtr<Node> > textNodes;
    for (Node* n = firstChild(); n; n = n->nextSibling()) {
        if (n->isTextNode())
            textNodes.append(n);
    }
    ExceptionCode ec;
    size_t size = textNodes.size();
    for (size_t i = 0; i < size; ++i)
        removeChild(textNodes[i].get(), ec);

    // Normalize line endings.
    // Add an extra line break if the string starts with one, since
    // the code to read default values from the DOM strips the leading one.
    String value = defaultValue;
    value.replace("\r\n", "\n");
    value.replace('\r', '\n');
    if (value[0] == '\n')
        value = "\n" + value;

    insertBefore(document()->createTextNode(value), firstChild(), ec);

    setValue(value);
}

int HTMLTextAreaElement::maxLength() const
{
    bool ok;
    int value = getAttribute(maxlengthAttr).string().toInt(&ok);
    return ok && value >= 0 ? value : -1;
}

void HTMLTextAreaElement::setMaxLength(int newValue, ExceptionCode& ec)
{
    if (newValue < 0)
        ec = INDEX_SIZE_ERR;
    else
        setAttribute(maxlengthAttr, String::number(newValue));
}

bool HTMLTextAreaElement::tooLong() const
{
    // Return false for the default value even if it is longer than maxLength.
    if (!m_isDirty)
        return false;

    int max = maxLength();
    if (max < 0)
        return false;
    return value().length() > static_cast<unsigned>(max);
}

void HTMLTextAreaElement::accessKeyAction(bool)
{
    focus();
}

const AtomicString& HTMLTextAreaElement::accessKey() const
{
    return getAttribute(accesskeyAttr);
}

void HTMLTextAreaElement::setAccessKey(const String& value)
{
    setAttribute(accesskeyAttr, value);
}

void HTMLTextAreaElement::setCols(int cols)
{
    setAttribute(colsAttr, String::number(cols));
}

void HTMLTextAreaElement::setRows(int rows)
{
    setAttribute(rowsAttr, String::number(rows));
}

bool HTMLTextAreaElement::shouldUseInputMethod() const
{
    return true;
}

} // namespace