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      1 /*
      2  * Copyright (C) 2011 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 are
      6  * met:
      7  *
      8  * 1. Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *
     11  * 2. Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. AND ITS CONTRIBUTORS
     17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC.
     20  * OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include "config.h"
     30 #include "web/PageOverlayList.h"
     31 
     32 #include "public/web/WebPageOverlay.h"
     33 #include "web/PageOverlay.h"
     34 #include "web/WebViewImpl.h"
     35 
     36 namespace blink {
     37 
     38 PassOwnPtr<PageOverlayList> PageOverlayList::create(WebViewImpl* viewImpl)
     39 {
     40     return adoptPtr(new PageOverlayList(viewImpl));
     41 }
     42 
     43 PageOverlayList::PageOverlayList(WebViewImpl* viewImpl)
     44     : m_viewImpl(viewImpl)
     45 {
     46 }
     47 
     48 PageOverlayList::~PageOverlayList()
     49 {
     50 }
     51 
     52 bool PageOverlayList::add(WebPageOverlay* overlay, int zOrder)
     53 {
     54     bool added = false;
     55     size_t index = find(overlay);
     56     if (index == WTF::kNotFound) {
     57         OwnPtr<PageOverlay> pageOverlay = PageOverlay::create(m_viewImpl, overlay);
     58         m_pageOverlays.append(pageOverlay.release());
     59         index = m_pageOverlays.size() - 1;
     60         added = true;
     61     }
     62 
     63     PageOverlay* pageOverlay = m_pageOverlays[index].get();
     64     pageOverlay->setZOrder(zOrder);
     65 
     66     // Adjust page overlay list order based on their z-order numbers. We first
     67     // check if we need to move the overlay up and do so if needed. Otherwise,
     68     // check if we need to move it down.
     69     bool zOrderChanged = false;
     70     for (size_t i = index; i + 1 < m_pageOverlays.size(); ++i) {
     71         if (m_pageOverlays[i]->zOrder() >= m_pageOverlays[i + 1]->zOrder()) {
     72             m_pageOverlays[i].swap(m_pageOverlays[i + 1]);
     73             zOrderChanged = true;
     74         }
     75     }
     76 
     77     if (!zOrderChanged) {
     78         for (size_t i = index; i >= 1; --i) {
     79             if (m_pageOverlays[i]->zOrder() < m_pageOverlays[i - 1]->zOrder()) {
     80                 m_pageOverlays[i].swap(m_pageOverlays[i - 1]);
     81                 zOrderChanged = true;
     82             }
     83         }
     84     }
     85 
     86     // If we did move the overlay, that means z-order is changed and we need to
     87     // update overlay layers' z-order. Otherwise, just update current overlay.
     88     if (zOrderChanged) {
     89         for (size_t i = 0; i < m_pageOverlays.size(); ++i)
     90             m_pageOverlays[i]->clear();
     91         update();
     92     } else
     93         pageOverlay->update();
     94 
     95     return added;
     96 }
     97 
     98 bool PageOverlayList::remove(WebPageOverlay* overlay)
     99 {
    100     size_t index = find(overlay);
    101     if (index == WTF::kNotFound)
    102         return false;
    103 
    104     m_pageOverlays[index]->clear();
    105     m_pageOverlays.remove(index);
    106     return true;
    107 }
    108 
    109 void PageOverlayList::update()
    110 {
    111     for (size_t i = 0; i < m_pageOverlays.size(); ++i)
    112         m_pageOverlays[i]->update();
    113 }
    114 
    115 void PageOverlayList::paintWebFrame(WebCore::GraphicsContext& gc)
    116 {
    117     for (size_t i = 0; i < m_pageOverlays.size(); ++i)
    118         m_pageOverlays[i]->paintWebFrame(gc);
    119 }
    120 
    121 size_t PageOverlayList::find(WebPageOverlay* overlay)
    122 {
    123     for (size_t i = 0; i < m_pageOverlays.size(); ++i) {
    124         if (m_pageOverlays[i]->overlay() == overlay)
    125             return i;
    126     }
    127     return WTF::kNotFound;
    128 }
    129 
    130 size_t PageOverlayList::findGraphicsLayer(WebCore::GraphicsLayer* layer)
    131 {
    132     for (size_t i = 0; i < m_pageOverlays.size(); ++i) {
    133         if (m_pageOverlays[i]->graphicsLayer() == layer)
    134             return i;
    135     }
    136     return WTF::kNotFound;
    137 }
    138 
    139 } // namespace blink
    140