src/third_party/WebKit/Source/web/ValidationMessageClientImpl.cpp

   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(0)
  47     , m_lastPageScaleFactor(1)
  48     , m_finishTime(0)
  49     , m_timer(this, &ValidationMessageClientImpl::checkAnchorStatus)
  50 {
  51 }
  52
  53 PassOwnPtr<ValidationMessageClientImpl> ValidationMessageClientImpl::create(WebViewImpl& webView)
  54 {
  55     return adoptPtr(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 = 0;
 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 }