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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 "web/ValidationMessageClientImpl.h"
     28 
     29 #include "core/dom/Element.h"
     30 #include "core/frame/FrameView.h"
     31 #include "core/rendering/RenderObject.h"
     32 #include "platform/HostWindow.h"
     33 #include "public/platform/WebRect.h"
     34 #include "public/platform/WebString.h"
     35 #include "public/web/WebTextDirection.h"
     36 #include "public/web/WebViewClient.h"
     37 #include "web/WebViewImpl.h"
     38 #include "wtf/CurrentTime.h"
     39 
     40 using namespace WebCore;
     41 
     42 namespace blink {
     43 
     44 ValidationMessageClientImpl::ValidationMessageClientImpl(WebViewImpl& webView)
     45     : m_webView(webView)
     46     , m_currentAnchor(nullptr)
     47     , m_lastPageScaleFactor(1)
     48     , m_finishTime(0)
     49     , m_timer(this, &ValidationMessageClientImpl::checkAnchorStatus)
     50 {
     51 }
     52 
     53 PassOwnPtrWillBeRawPtr<ValidationMessageClientImpl> ValidationMessageClientImpl::create(WebViewImpl& webView)
     54 {
     55     return adoptPtrWillBeNoop(new ValidationMessageClientImpl(webView));
     56 }
     57 
     58 ValidationMessageClientImpl::~ValidationMessageClientImpl()
     59 {
     60 }
     61 
     62 FrameView* ValidationMessageClientImpl::currentView()
     63 {
     64     return m_currentAnchor->document().view();
     65 }
     66 
     67 void ValidationMessageClientImpl::showValidationMessage(const Element& anchor, const String& message)
     68 {
     69     if (message.isEmpty()) {
     70         hideValidationMessage(anchor);
     71         return;
     72     }
     73     if (!anchor.renderBox())
     74         return;
     75     if (m_currentAnchor)
     76         hideValidationMessage(*m_currentAnchor);
     77     m_currentAnchor = &anchor;
     78     IntRect anchorInRootView = currentView()->contentsToRootView(anchor.pixelSnappedBoundingBox());
     79     m_lastAnchorRectInScreen = currentView()->hostWindow()->rootViewToScreen(anchorInRootView);
     80     m_lastPageScaleFactor = m_webView.pageScaleFactor();
     81     m_message = message;
     82 
     83     WebTextDirection dir = m_currentAnchor->renderer()->style()->direction() == RTL ? WebTextDirectionRightToLeft : WebTextDirectionLeftToRight;
     84     AtomicString title = m_currentAnchor->fastGetAttribute(HTMLNames::titleAttr);
     85     m_webView.client()->showValidationMessage(anchorInRootView, m_message, title, dir);
     86 
     87     const double minimumSecondToShowValidationMessage = 5.0;
     88     const double secondPerCharacter = 0.05;
     89     const double statusCheckInterval = 0.1;
     90     m_finishTime = monotonicallyIncreasingTime() + std::max(minimumSecondToShowValidationMessage, (message.length() + title.length()) * secondPerCharacter);
     91     // FIXME: We should invoke checkAnchorStatus actively when layout, scroll,
     92     // or page scale change happen.
     93     m_timer.startRepeating(statusCheckInterval, FROM_HERE);
     94 }
     95 
     96 void ValidationMessageClientImpl::hideValidationMessage(const Element& anchor)
     97 {
     98     if (!m_currentAnchor || !isValidationMessageVisible(anchor))
     99         return;
    100     m_timer.stop();
    101     m_currentAnchor = nullptr;
    102     m_message = String();
    103     m_finishTime = 0;
    104     m_webView.client()->hideValidationMessage();
    105 }
    106 
    107 bool ValidationMessageClientImpl::isValidationMessageVisible(const Element& anchor)
    108 {
    109     return m_currentAnchor == &anchor;
    110 }
    111 
    112 void ValidationMessageClientImpl::documentDetached(const Document& document)
    113 {
    114     if (m_currentAnchor && m_currentAnchor->document() == document)
    115         hideValidationMessage(*m_currentAnchor);
    116 }
    117 
    118 void ValidationMessageClientImpl::checkAnchorStatus(Timer<ValidationMessageClientImpl>*)
    119 {
    120     ASSERT(m_currentAnchor);
    121     if (monotonicallyIncreasingTime() >= m_finishTime || !currentView()) {
    122         hideValidationMessage(*m_currentAnchor);
    123         return;
    124     }
    125 
    126     // Check the visibility of the element.
    127     // FIXME: Can we check invisibility by scrollable non-frame elements?
    128     IntRect newAnchorRect = currentView()->contentsToRootView(m_currentAnchor->pixelSnappedBoundingBox());
    129     newAnchorRect = intersection(currentView()->convertToRootView(currentView()->boundsRect()), newAnchorRect);
    130     if (newAnchorRect.isEmpty()) {
    131         hideValidationMessage(*m_currentAnchor);
    132         return;
    133     }
    134 
    135     IntRect newAnchorRectInScreen = currentView()->hostWindow()->rootViewToScreen(newAnchorRect);
    136     if (newAnchorRectInScreen == m_lastAnchorRectInScreen && m_webView.pageScaleFactor() == m_lastPageScaleFactor)
    137         return;
    138     m_lastAnchorRectInScreen = newAnchorRectInScreen;
    139     m_lastPageScaleFactor = m_webView.pageScaleFactor();
    140     m_webView.client()->moveValidationMessage(newAnchorRect);
    141 }
    142 
    143 void ValidationMessageClientImpl::willBeDestroyed()
    144 {
    145     if (m_currentAnchor)
    146         hideValidationMessage(*m_currentAnchor);
    147 }
    148 
    149 void ValidationMessageClientImpl::trace(Visitor* visitor)
    150 {
    151     visitor->trace(m_currentAnchor);
    152     ValidationMessageClient::trace(visitor);
    153 }
    154 
    155 }
    156