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