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
41using namespace WebCore;
42
43namespace blink {
44
45ValidationMessageClientImpl::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
55PassOwnPtr<ValidationMessageClientImpl> ValidationMessageClientImpl::create(WebViewImpl& webView, WebValidationMessageClient* client)
56{
57    return adoptPtr(new ValidationMessageClientImpl(webView, client));
58}
59
60ValidationMessageClientImpl::~ValidationMessageClientImpl()
61{
62    if (m_currentAnchor)
63        hideValidationMessage(*m_currentAnchor);
64}
65
66FrameView* ValidationMessageClientImpl::currentView()
67{
68    return m_currentAnchor->document().view();
69}
70
71void 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
102void 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
115bool ValidationMessageClientImpl::isValidationMessageVisible(const Element& anchor)
116{
117    return m_currentAnchor == &anchor;
118}
119
120void ValidationMessageClientImpl::documentDetached(const Document& document)
121{
122    if (m_currentAnchor && m_currentAnchor->document() == document)
123        hideValidationMessage(*m_currentAnchor);
124}
125
126void 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