gecko-dev/accessible/base/AccCollector.cpp

118 строки
2.7 KiB
C++
Исходник Обычный вид История

2012-05-21 15:12:37 +04:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "AccCollector.h"
#include "Accessible.h"
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// nsAccCollector
////////////////////////////////////////////////////////////////////////////////
AccCollector::
AccCollector(Accessible* aRoot, filters::FilterFuncPtr aFilterFunc) :
mFilterFunc(aFilterFunc), mRoot(aRoot), mRootChildIdx(0)
{
}
AccCollector::~AccCollector()
{
}
uint32_t
AccCollector::Count()
{
EnsureNGetIndex(nullptr);
return mObjects.Length();
}
Accessible*
AccCollector::GetAccessibleAt(uint32_t aIndex)
{
Accessible* accessible = mObjects.SafeElementAt(aIndex, nullptr);
if (accessible)
return accessible;
return EnsureNGetObject(aIndex);
}
int32_t
AccCollector::GetIndexAt(Accessible* aAccessible)
{
int32_t index = mObjects.IndexOf(aAccessible);
if (index != -1)
return index;
return EnsureNGetIndex(aAccessible);
}
////////////////////////////////////////////////////////////////////////////////
// nsAccCollector protected
Accessible*
AccCollector::EnsureNGetObject(uint32_t aIndex)
{
uint32_t childCount = mRoot->ChildCount();
while (mRootChildIdx < childCount) {
Accessible* child = mRoot->GetChildAt(mRootChildIdx++);
if (!(mFilterFunc(child) & filters::eMatch))
continue;
AppendObject(child);
if (mObjects.Length() - 1 == aIndex)
return mObjects[aIndex];
}
return nullptr;
}
int32_t
AccCollector::EnsureNGetIndex(Accessible* aAccessible)
{
uint32_t childCount = mRoot->ChildCount();
while (mRootChildIdx < childCount) {
Accessible* child = mRoot->GetChildAt(mRootChildIdx++);
if (!(mFilterFunc(child) & filters::eMatch))
continue;
AppendObject(child);
if (child == aAccessible)
return mObjects.Length() - 1;
}
return -1;
}
void
AccCollector::AppendObject(Accessible* aAccessible)
{
mObjects.AppendElement(aAccessible);
}
////////////////////////////////////////////////////////////////////////////////
// EmbeddedObjCollector
////////////////////////////////////////////////////////////////////////////////
int32_t
EmbeddedObjCollector::GetIndexAt(Accessible* aAccessible)
{
if (aAccessible->mParent != mRoot)
return -1;
if (aAccessible->mIndexOfEmbeddedChild != -1)
return aAccessible->mIndexOfEmbeddedChild;
return mFilterFunc(aAccessible) & filters::eMatch ?
EnsureNGetIndex(aAccessible) : -1;
}
void
EmbeddedObjCollector::AppendObject(Accessible* aAccessible)
{
aAccessible->mIndexOfEmbeddedChild = mObjects.Length();
mObjects.AppendElement(aAccessible);
}