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
40using namespace WebCore;
41
42namespace WebKit {
43
44ValidationMessageClientImpl::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
54PassOwnPtr<ValidationMessageClientImpl> ValidationMessageClientImpl::create(WebViewImpl& webView, WebValidationMessageClient& client)
55{
56    return adoptPtr(new ValidationMessageClientImpl(webView, client));
57}
58
59ValidationMessageClientImpl::~ValidationMessageClientImpl()
60{
61    if (m_currentAnchor)
62        hideValidationMessage(*m_currentAnchor);
63}
64
65FrameView* ValidationMessageClientImpl::currentView()
66{
67    return m_currentAnchor->document()->view();
68}
69
70void 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
99void 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
110bool ValidationMessageClientImpl::isValidationMessageVisible(const Element& anchor)
111{
112    return m_currentAnchor == &anchor;
113}
114
115void ValidationMessageClientImpl::documentDetached(const Document& document)
116{
117    if (m_currentAnchor && m_currentAnchor->document() == &document)
118        hideValidationMessage(*m_currentAnchor);
119}
120
121void 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