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      1 /*
      2  * Copyright (C) 2011 Apple 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''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #import "config.h"
     27 #import "AccessibilityWebPageObject.h"
     28 
     29 #import "WebFrame.h"
     30 #import "WebPage.h"
     31 #import <WebCore/AXObjectCache.h>
     32 #import <WebCore/Frame.h>
     33 #import <WebCore/FrameView.h>
     34 #import <WebCore/ScrollView.h>
     35 #import <WebCore/Scrollbar.h>
     36 #import <WebKitSystemInterface.h>
     37 
     38 using namespace WebCore;
     39 using namespace WebKit;
     40 
     41 @implementation AccessibilityWebPageObject
     42 
     43 - (id)accessibilityRootObjectWrapper
     44 {
     45     WebCore::Page* page = m_page->corePage();
     46     if (!page)
     47         return nil;
     48 
     49     WebCore::Frame* core = page->mainFrame();
     50     if (!core || !core->document())
     51         return nil;
     52 
     53     AccessibilityObject* root = core->document()->axObjectCache()->rootObject();
     54     if (!root)
     55         return nil;
     56 
     57     return root->wrapper();
     58 }
     59 
     60 - (void)setWebPage:(WebPage*)page
     61 {
     62     m_page = page;
     63 }
     64 
     65 - (void)setRemoteParent:(id)parent
     66 {
     67     if (parent != m_parent) {
     68         [m_parent release];
     69         m_parent = [parent retain];
     70     }
     71 }
     72 
     73 - (void)dealloc
     74 {
     75     WKUnregisterUniqueIdForElement(self);
     76     [m_accessibilityChildren release];
     77     [m_attributeNames release];
     78     [m_parent release];
     79     [super dealloc];
     80 }
     81 
     82 - (BOOL)accessibilityIsIgnored
     83 {
     84     return NO;
     85 }
     86 
     87 - (NSArray *)accessibilityAttributeNames
     88 {
     89     if (!m_attributeNames)
     90         m_attributeNames = [[NSArray alloc] initWithObjects:
     91                            NSAccessibilityRoleAttribute, NSAccessibilityRoleDescriptionAttribute, NSAccessibilityFocusedAttribute,
     92                            NSAccessibilityParentAttribute, NSAccessibilityWindowAttribute, NSAccessibilityTopLevelUIElementAttribute,
     93                            NSAccessibilityPositionAttribute, NSAccessibilitySizeAttribute, NSAccessibilityChildrenAttribute, nil];
     94 
     95     return m_attributeNames;
     96 }
     97 
     98 - (BOOL)accessibilityIsAttributeSettable:(NSString *)attribute
     99 {
    100     return NO;
    101 }
    102 
    103 - (void)accessibilitySetValue:(id)value forAttribute:(NSString *)attribute
    104 {
    105     return;
    106 }
    107 
    108 - (NSArray *)accessibilityActionNames
    109 {
    110     return [NSArray array];
    111 }
    112 
    113 - (NSArray *)accessibilityChildren
    114 {
    115     id wrapper = [self accessibilityRootObjectWrapper];
    116     if (!wrapper)
    117         return [NSArray array];
    118 
    119     return [NSArray arrayWithObject:wrapper];
    120 }
    121 
    122 - (id)accessibilityAttributeValue:(NSString *)attribute
    123 {
    124     if (!WebCore::AXObjectCache::accessibilityEnabled())
    125         WebCore::AXObjectCache::enableAccessibility();
    126 
    127     if ([attribute isEqualToString:NSAccessibilityParentAttribute])
    128         return m_parent;
    129     if ([attribute isEqualToString:NSAccessibilityWindowAttribute])
    130         return [m_parent accessibilityAttributeValue:NSAccessibilityWindowAttribute];
    131     if ([attribute isEqualToString:NSAccessibilityTopLevelUIElementAttribute])
    132         return [m_parent accessibilityAttributeValue:NSAccessibilityTopLevelUIElementAttribute];
    133     if ([attribute isEqualToString:NSAccessibilityRoleAttribute])
    134         return NSAccessibilityGroupRole;
    135     if ([attribute isEqualToString:NSAccessibilityRoleDescriptionAttribute])
    136         return NSAccessibilityRoleDescription(NSAccessibilityGroupRole, nil);
    137     if ([attribute isEqualToString:NSAccessibilityFocusedAttribute])
    138         return [NSNumber numberWithBool:NO];
    139 
    140     if (!m_page)
    141         return nil;
    142 
    143     if ([attribute isEqualToString:NSAccessibilityPositionAttribute]) {
    144         WebCore::IntPoint point = m_page->accessibilityPosition();
    145         return [NSValue valueWithPoint:NSMakePoint(point.x(), point.y())];
    146     }
    147     if ([attribute isEqualToString:NSAccessibilitySizeAttribute]) {
    148         const IntSize& s = m_page->size();
    149         return [NSValue valueWithSize:NSMakeSize(s.width(), s.height())];
    150     }
    151     if ([attribute isEqualToString:NSAccessibilityChildrenAttribute])
    152         return [self accessibilityChildren];
    153 
    154     return [super accessibilityAttributeValue:attribute];
    155 }
    156 
    157 - (BOOL)accessibilityShouldUseUniqueId
    158 {
    159     return YES;
    160 }
    161 
    162 - (id)accessibilityHitTest:(NSPoint)point
    163 {
    164     // Hit-test point comes in as bottom-screen coordinates. Needs to be normalized to the frame of the web page.
    165     NSPoint remotePosition = [[self accessibilityAttributeValue:NSAccessibilityPositionAttribute] pointValue];
    166     NSSize remoteSize = [[self accessibilityAttributeValue:NSAccessibilitySizeAttribute] sizeValue];
    167 
    168     // Get the y position of the WKView (we have to screen-flip and go from bottom left to top left).
    169     CGFloat screenHeight = [[[NSScreen screens] objectAtIndex:0] frame].size.height;
    170     remotePosition.y = (screenHeight - remotePosition.y) - remoteSize.height;
    171 
    172     point.y = screenHeight - point.y;
    173 
    174     // Re-center point into the web page's frame.
    175     point.y -= remotePosition.y;
    176     point.x -= remotePosition.x;
    177 
    178     if (m_page && m_page->mainFrame() && m_page->mainFrame()->coreFrame()) {
    179         WebCore::FrameView* fv = m_page->mainFrame()->coreFrame()->view();
    180         if (fv) {
    181             point.y += fv->scrollPosition().y();
    182             point.x += fv->scrollPosition().x();
    183         }
    184     }
    185 
    186     return [[self accessibilityRootObjectWrapper] accessibilityHitTest:point];
    187 }
    188 
    189 - (id)accessibilityFocusedUIElement
    190 {
    191     return [[self accessibilityRootObjectWrapper] accessibilityFocusedUIElement];
    192 }
    193 
    194 
    195 @end
    196