1 files changed, 307 insertions, 0 deletions
diff --git a/WebCore/dom/InputElement.cpp b/WebCore/dom/InputElement.cpp
new file mode 100644
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--- /dev/null
+++ b/WebCore/dom/InputElement.cpp
@@ -0,0 +1,307 @@
+/*
+ * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
+ *
+ * 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 "InputElement.h"
+
+#include "BeforeTextInsertedEvent.h"
+#include "ChromeClient.h"
+#include "Document.h"
+#include "Event.h"
+#include "EventNames.h"
+#include "FormControlElement.h"
+#include "Frame.h"
+#include "HTMLInputElement.h"
+#include "HTMLNames.h"
+#include "Page.h"
+#include "RenderTextControlSingleLine.h"
+#include "SelectionController.h"
+#include "TextIterator.h"
+#include "TextBreakIterator.h"
+
+#if ENABLE(WML)
+#include "WMLInputElement.h"
+#include "WMLNames.h"
+#endif
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+// FIXME: According to HTML4, the length attribute's value can be arbitrarily
+// large. However, due to http://bugs.webkit.org/show_bugs.cgi?id=14536 things
+// get rather sluggish when a text field has a larger number of characters than
+// this, even when just clicking in the text field.
+const int InputElement::s_maximumLength = 524288;
+const int InputElement::s_defaultSize = 20;
+
+void InputElement::dispatchFocusEvent(InputElementData& data, Document* document)
+{
+    if (!data.inputElement()->isTextField())
+        return;
+
+    updatePlaceholderVisibility(data, document);
+
+    if (data.inputElement()->isPasswordField() && document->frame())
+        document->setUseSecureKeyboardEntryWhenActive(true);
+}
+
+void InputElement::dispatchBlurEvent(InputElementData& data, Document* document)
+{
+    if (!data.inputElement()->isTextField())
+        return;
+
+    Frame* frame = document->frame();
+    if (!frame)
+        return;
+
+    updatePlaceholderVisibility(data, document);
+
+    if (data.inputElement()->isPasswordField())
+        document->setUseSecureKeyboardEntryWhenActive(false);
+
+    frame->textFieldDidEndEditing(data.element());
+}
+
+void InputElement::updatePlaceholderVisibility(InputElementData& data, Document* document, bool placeholderValueChanged)
+{
+    ASSERT(data.inputElement()->isTextField());
+
+    bool oldPlaceholderShouldBeVisible = data.placeholderShouldBeVisible();
+    Element* element = data.element();
+
+    data.setPlaceholderShouldBeVisible(data.inputElement()->value().isEmpty() 
+                                       && document->focusedNode() != element
+                                       && !data.inputElement()->placeholderValue().isEmpty());
+
+    if ((oldPlaceholderShouldBeVisible != data.placeholderShouldBeVisible() || placeholderValueChanged) && element->renderer())
+        static_cast<RenderTextControlSingleLine*>(element->renderer())->updatePlaceholderVisibility();
+}
+
+void InputElement::updateFocusAppearance(InputElementData& data, Document* document, bool restorePreviousSelection)
+{
+    ASSERT(data.inputElement()->isTextField());
+
+    if (!restorePreviousSelection || data.cachedSelectionStart() == -1)
+        data.inputElement()->select();
+    else
+        // Restore the cached selection.
+        updateSelectionRange(data, data.cachedSelectionStart(), data.cachedSelectionEnd());
+
+    if (document && document->frame())
+        document->frame()->revealSelection();
+}
+
+void InputElement::updateSelectionRange(InputElementData& data, int start, int end)
+{
+    if (!data.inputElement()->isTextField())
+        return;
+
+    if (RenderTextControl* renderer = static_cast<RenderTextControl*>(data.element()->renderer()))
+        renderer->setSelectionRange(start, end);
+}
+
+void InputElement::aboutToUnload(InputElementData& data, Document* document)
+{
+    if (!data.inputElement()->isTextField() || !data.element()->focused() || !document->frame())
+        return;
+
+    document->frame()->textFieldDidEndEditing(data.element());
+}
+
+void InputElement::setValueFromRenderer(InputElementData& data, Document* document, const String& value)
+{
+    // Renderer and our event handler are responsible for constraining values.
+    ASSERT(value == data.inputElement()->constrainValue(value) || data.inputElement()->constrainValue(value).isEmpty());
+
+    if (data.inputElement()->isTextField())
+        updatePlaceholderVisibility(data, document);
+
+    // Workaround for bug where trailing \n is included in the result of textContent.
+    // The assert macro above may also be simplified to:  value == constrainValue(value)
+    // http://bugs.webkit.org/show_bug.cgi?id=9661
+    if (value == "\n")
+        data.setValue("");
+    else
+        data.setValue(value);
+
+    Element* element = data.element();
+    FormControlElement* formControlElement = toFormControlElement(element);
+    ASSERT(formControlElement);
+    formControlElement->setValueMatchesRenderer();
+
+    // Fire the "input" DOM event
+    element->dispatchEventForType(eventNames().inputEvent, true, false);
+    notifyFormStateChanged(data, document);
+}
+
+static int numCharactersInGraphemeClusters(StringImpl* s, int numGraphemeClusters)
+{
+    if (!s)
+        return 0;
+
+    TextBreakIterator* it = characterBreakIterator(s->characters(), s->length());
+    if (!it)
+        return 0;
+
+    for (int i = 0; i < numGraphemeClusters; ++i) {
+        if (textBreakNext(it) == TextBreakDone)
+            return s->length();
+    }
+
+    return textBreakCurrent(it);
+}
+
+String InputElement::constrainValue(const InputElementData& data, const String& proposedValue, int maxLength)
+{
+    String string = proposedValue;
+    if (!data.inputElement()->isTextField())
+        return string;
+        
+    string.replace("\r\n", " ");
+    string.replace('\r', ' ');
+    string.replace('\n', ' ');
+    
+    StringImpl* s = string.impl();
+    int newLength = numCharactersInGraphemeClusters(s, maxLength);
+    for (int i = 0; i < newLength; ++i) {
+        const UChar& current = (*s)[i];
+        if (current < ' ' && current != '\t') {
+            newLength = i;
+            break;
+        }
+    }
+
+    if (newLength < static_cast<int>(string.length()))
+        return string.left(newLength);
+
+    return string;
+}
+
+static int numGraphemeClusters(StringImpl* s)
+{
+    if (!s)
+        return 0;
+
+    TextBreakIterator* it = characterBreakIterator(s->characters(), s->length());
+    if (!it)
+        return 0;
+
+    int num = 0;
+    while (textBreakNext(it) != TextBreakDone)
+        ++num;
+
+    return num;
+}
+
+void InputElement::handleBeforeTextInsertedEvent(InputElementData& data, Document* document, Event* event)
+{
+    ASSERT(event->isBeforeTextInsertedEvent());
+
+    // Make sure that the text to be inserted will not violate the maxLength.
+    int oldLength = numGraphemeClusters(data.inputElement()->value().impl());
+    ASSERT(oldLength <= data.maxLength());
+    int selectionLength = numGraphemeClusters(plainText(document->frame()->selection()->selection().toRange().get()).impl());
+    ASSERT(oldLength >= selectionLength);
+    int maxNewLength = data.maxLength() - (oldLength - selectionLength);
+
+    // Truncate the inserted text to avoid violating the maxLength and other constraints.
+    BeforeTextInsertedEvent* textEvent = static_cast<BeforeTextInsertedEvent*>(event);
+    textEvent->setText(constrainValue(data, textEvent->text(), maxNewLength));
+}
+
+void InputElement::parseSizeAttribute(InputElementData& data, MappedAttribute* attribute)
+{
+    data.setSize(attribute->isNull() ? InputElement::s_defaultSize : attribute->value().toInt());
+
+    if (RenderObject* renderer = data.element()->renderer())
+        renderer->setNeedsLayoutAndPrefWidthsRecalc();
+}
+
+void InputElement::parseMaxLengthAttribute(InputElementData& data, MappedAttribute* attribute)
+{
+    int maxLength = attribute->isNull() ? InputElement::s_maximumLength : attribute->value().toInt();
+    if (maxLength <= 0 || maxLength > InputElement::s_maximumLength)
+        maxLength = InputElement::s_maximumLength;
+
+    int oldMaxLength = data.maxLength();
+    data.setMaxLength(maxLength);
+
+    if (oldMaxLength != maxLength)
+        updateValueIfNeeded(data);
+
+    data.element()->setChanged();
+}
+
+void InputElement::updateValueIfNeeded(InputElementData& data)
+{
+    String oldValue = data.value();
+    String newValue = data.inputElement()->constrainValue(oldValue);
+    if (newValue != oldValue)
+        data.inputElement()->setValue(newValue);
+}
+
+void InputElement::notifyFormStateChanged(InputElementData& data, Document* document)
+{
+    Frame* frame = document->frame();
+    if (!frame)
+        return;
+
+    if (Page* page = frame->page())
+        page->chrome()->client()->formStateDidChange(data.element());
+}
+
+// InputElementData
+InputElementData::InputElementData(InputElement* inputElement, Element* element)
+    : m_inputElement(inputElement)
+    , m_element(element)
+    , m_placeholderShouldBeVisible(false)
+    , m_size(InputElement::s_defaultSize)
+    , m_maxLength(InputElement::s_maximumLength)
+    , m_cachedSelectionStart(-1)
+    , m_cachedSelectionEnd(-1)
+{
+    ASSERT(m_inputElement);
+    ASSERT(m_element);
+}
+
+InputElementData::~InputElementData()
+{
+}
+
+const AtomicString& InputElementData::name() const
+{
+    return m_name.isNull() ? emptyAtom : m_name;
+}
+
+InputElement* toInputElement(Element* element)
+{
+    if (element->isHTMLElement() && (element->hasTagName(inputTag) || element->hasTagName(isindexTag)))
+        return static_cast<HTMLInputElement*>(element);
+
+#if ENABLE(WML)
+    if (element->isWMLElement() && element->hasTagName(WMLNames::inputTag))
+        return static_cast<WMLInputElement*>(element);
+#endif
+
+    return 0;
+}
+
+}