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      1 /*
      2  * Copyright (C) 2012 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *     notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *     notice, this list of conditions and the following disclaimer in the
     11  *     documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
     14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     16  * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
     17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     20  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     23  * SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "ValidationMessageClientImpl.h"
     28 
     29 #include "WebTextDirection.h"
     30 #include "WebValidationMessageClient.h"
     31 #include "WebViewImpl.h"
     32 #include "core/dom/Element.h"
     33 #include "core/page/FrameView.h"
     34 #include "core/platform/HostWindow.h"
     35 #include "core/rendering/RenderObject.h"
     36 #include "wtf/CurrentTime.h"
     37 #include "public/platform/WebRect.h"
     38 #include "public/platform/WebString.h"
     39 
     40 using namespace WebCore;
     41 
     42 namespace WebKit {
     43 
     44 ValidationMessageClientImpl::ValidationMessageClientImpl(WebViewImpl& webView, WebValidationMessageClient& client)
     45     : m_webView(webView)
     46     , m_client(client)
     47     , m_currentAnchor(0)
     48     , m_lastPageScaleFactor(1)
     49     , m_finishTime(0)
     50     , m_timer(this, &ValidationMessageClientImpl::checkAnchorStatus)
     51 {
     52 }
     53 
     54 PassOwnPtr<ValidationMessageClientImpl> ValidationMessageClientImpl::create(WebViewImpl& webView, WebValidationMessageClient& client)
     55 {
     56     return adoptPtr(new ValidationMessageClientImpl(webView, client));
     57 }
     58 
     59 ValidationMessageClientImpl::~ValidationMessageClientImpl()
     60 {
     61     if (m_currentAnchor)
     62         hideValidationMessage(*m_currentAnchor);
     63 }
     64 
     65 FrameView* ValidationMessageClientImpl::currentView()
     66 {
     67     return m_currentAnchor->document()->view();
     68 }
     69 
     70 void ValidationMessageClientImpl::showValidationMessage(const Element& anchor, const String& message)
     71 {
     72     if (message.isEmpty()) {
     73         hideValidationMessage(anchor);
     74         return;
     75     }
     76     if (!anchor.renderBox())
     77         return;
     78     if (m_currentAnchor)
     79         hideValidationMessage(*m_currentAnchor);
     80     m_currentAnchor = &anchor;
     81     IntRect anchorInRootView = currentView()->contentsToRootView(anchor.pixelSnappedBoundingBox());
     82     m_lastAnchorRectInScreen = currentView()->hostWindow()->rootViewToScreen(anchorInRootView);
     83     m_lastPageScaleFactor = m_webView.pageScaleFactor();
     84     m_message = message;
     85 
     86     WebTextDirection dir = m_currentAnchor->renderer()->style()->direction() == RTL ? WebTextDirectionRightToLeft : WebTextDirectionLeftToRight;
     87     AtomicString title = m_currentAnchor->fastGetAttribute(HTMLNames::titleAttr);
     88     m_client.showValidationMessage(anchorInRootView, m_message, title, dir);
     89 
     90     const double minimumSecondToShowValidationMessage = 5.0;
     91     const double secondPerCharacter = 0.05;
     92     const double statusCheckInterval = 0.1;
     93     m_finishTime = monotonicallyIncreasingTime() + std::max(minimumSecondToShowValidationMessage, (message.length() + title.length()) * secondPerCharacter);
     94     // FIXME: We should invoke checkAnchorStatus actively when layout, scroll,
     95     // or page scale change happen.
     96     m_timer.startRepeating(statusCheckInterval);
     97 }
     98 
     99 void ValidationMessageClientImpl::hideValidationMessage(const Element& anchor)
    100 {
    101     if (!m_currentAnchor || !isValidationMessageVisible(anchor))
    102         return;
    103     m_timer.stop();
    104     m_currentAnchor = 0;
    105     m_message = String();
    106     m_finishTime = 0;
    107     m_client.hideValidationMessage();
    108 }
    109 
    110 bool ValidationMessageClientImpl::isValidationMessageVisible(const Element& anchor)
    111 {
    112     return m_currentAnchor == &anchor;
    113 }
    114 
    115 void ValidationMessageClientImpl::documentDetached(const Document& document)
    116 {
    117     if (m_currentAnchor && m_currentAnchor->document() == &document)
    118         hideValidationMessage(*m_currentAnchor);
    119 }
    120 
    121 void ValidationMessageClientImpl::checkAnchorStatus(Timer<ValidationMessageClientImpl>*)
    122 {
    123     ASSERT(m_currentAnchor);
    124     if (monotonicallyIncreasingTime() >= m_finishTime || !currentView()) {
    125         hideValidationMessage(*m_currentAnchor);
    126         return;
    127     }
    128 
    129     // Check the visibility of the element.
    130     // FIXME: Can we check invisibility by scrollable non-frame elements?
    131     IntRect newAnchorRect = currentView()->contentsToRootView(m_currentAnchor->pixelSnappedBoundingBox());
    132     newAnchorRect = intersection(currentView()->convertToRootView(currentView()->boundsRect()), newAnchorRect);
    133     if (newAnchorRect.isEmpty()) {
    134         hideValidationMessage(*m_currentAnchor);
    135         return;
    136     }
    137 
    138     IntRect newAnchorRectInScreen = currentView()->hostWindow()->rootViewToScreen(newAnchorRect);
    139     if (newAnchorRectInScreen == m_lastAnchorRectInScreen && m_webView.pageScaleFactor() == m_lastPageScaleFactor)
    140         return;
    141     m_lastAnchorRectInScreen = newAnchorRectInScreen;
    142     m_lastPageScaleFactor = m_webView.pageScaleFactor();
    143     m_client.moveValidationMessage(newAnchorRect);
    144 }
    145 
    146 }
    147