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      1 /*
      2  * Copyright 2007, The Android Open Source Project
      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  *  * Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  *  * 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 THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 #define LOG_TAG "WebCore"
     26 
     27 #include "config.h"
     28 #include "ScrollView.h"
     29 
     30 #include "FloatRect.h"
     31 #include "FrameView.h"
     32 #include "IntRect.h"
     33 #include "SkRegion.h"
     34 #include "WebCoreFrameBridge.h"
     35 #include "WebCoreViewBridge.h"
     36 #include "WebViewCore.h"
     37 
     38 /*
     39     This class implementation does NOT actually emulate the Qt ScrollView.
     40     It does provide an implementation that khtml will use to interact with
     41     WebKit's WebFrameView documentView and our NSScrollView subclass.
     42 
     43     ScrollView's view is a NSScrollView (or subclass of NSScrollView)
     44     in most cases. That scrollview is a subview of an
     45     WebCoreFrameView. The WebCoreFrameView's documentView will also be
     46     the scroll view's documentView.
     47 
     48     The WebCoreFrameView's size is the frame size.  The WebCoreFrameView's documentView
     49     corresponds to the frame content size.  The scrollview itself is autosized to the
     50     WebCoreFrameView's size (see Widget::resize).
     51 */
     52 
     53 namespace WebCore {
     54 
     55 IntRect ScrollView::platformVisibleContentRect(bool includeScrollbars) const
     56 {
     57     IntRect rect = platformWidget()->getBounds();
     58     // This makes subframes draw correctly, since subframes cannot scroll.
     59     if (parent())
     60         return IntRect(0, 0, rect.width(), rect.height());
     61     return rect;
     62 }
     63 
     64 IntSize ScrollView::platformContentsSize() const
     65 {
     66     return m_contentsSize;
     67 }
     68 
     69 void ScrollView::platformSetScrollPosition(const WebCore::IntPoint& pt)
     70 {
     71     if (parent()) // don't attempt to scroll subframes; they're fully visible
     72         return;
     73     android::WebViewCore::getWebViewCore(this)->scrollTo(pt.x(), pt.y());
     74 }
     75 
     76 void ScrollView::platformSetScrollbarModes()
     77 {
     78     if (parent()) // no scrollbar for the subframes
     79         return;
     80     android::WebViewCore::getWebViewCore(this)->setScrollbarModes(m_horizontalScrollbarMode, m_verticalScrollbarMode);
     81 }
     82 
     83 void ScrollView::platformScrollbarModes(ScrollbarMode& h, ScrollbarMode& v) const
     84 {
     85     // m_horizontalScrollbarMode and m_verticalScrollbarMode are set in ScrollView::setScrollbarModes()
     86     h = m_horizontalScrollbarMode;
     87     v = m_verticalScrollbarMode;
     88 }
     89 
     90 bool ScrollView::platformProhibitsScrolling()
     91 {
     92     if (!isFrameView())
     93         return false;
     94     FrameView* view = static_cast<FrameView*>(this);
     95     // We want to ignore requests to scroll that were not initiated by the user.  An
     96     // example of this is when text is inserted into a textfield/area, which results in
     97     // a scroll.  We ignore this because we now how to do this ourselves in the UI thread.
     98     // An example of it being initiated by the user is if the user clicks an anchor
     99     // element which simply scrolls the page.
    100     return !android::WebFrame::getWebFrame(view->frame())->userInitiatedClick();
    101 }
    102 
    103 void ScrollView::platformRepaintContentRectangle(const IntRect &rect, bool now)
    104 {
    105     android::WebViewCore::getWebViewCore(this)->contentInvalidate(rect);
    106 }
    107 
    108 #ifdef ANDROID_CAPTURE_OFFSCREEN_PAINTS
    109 //  Compute the offscreen parts of the drawn rectangle by subtracting
    110 //  vis from rect. This can compute up to four rectangular slices.
    111 void ScrollView::platformOffscreenContentRectangle(const IntRect& vis, const IntRect& rect)
    112 {
    113     SkRegion rectRgn = SkRegion(rect);
    114     rectRgn.op(vis, SkRegion::kDifference_Op);
    115     SkRegion::Iterator iter(rectRgn);
    116     for (; !iter.done(); iter.next()) {
    117         const SkIRect& diff = iter.rect();
    118         android::WebViewCore::getWebViewCore(this)->offInvalidate(diff);
    119     }
    120 }
    121 #endif
    122 
    123 } // namespace WebCore
    124