diff options
Diffstat (limited to 'accessible/windows/sdn/sdnTextAccessible.cpp')
| -rw-r--r-- | accessible/windows/sdn/sdnTextAccessible.cpp | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/accessible/windows/sdn/sdnTextAccessible.cpp b/accessible/windows/sdn/sdnTextAccessible.cpp new file mode 100644 index 000000000..b51caf44e --- /dev/null +++ b/accessible/windows/sdn/sdnTextAccessible.cpp @@ -0,0 +1,210 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=2 et sw=2 tw=80: */ +/* 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 "sdnTextAccessible.h" + +#include "ISimpleDOMText_i.c" + +#include "nsCoreUtils.h" +#include "DocAccessible.h" + +#include "nsIFrame.h" +#include "nsFontMetrics.h" +#include "nsPresContext.h" +#include "nsLayoutUtils.h" +#include "nsRange.h" +#include "gfxFont.h" +#include "nsIAccessibleTypes.h" +#include "mozilla/gfx/2D.h" + +using namespace mozilla::a11y; + +//////////////////////////////////////////////////////////////////////////////// +// sdnTextAccessible +//////////////////////////////////////////////////////////////////////////////// + +IMPL_IUNKNOWN_QUERY_HEAD(sdnTextAccessible) + IMPL_IUNKNOWN_QUERY_IFACE(ISimpleDOMText) +IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(mAccessible) + +STDMETHODIMP +sdnTextAccessible::get_domText(BSTR __RPC_FAR* aText) +{ + A11Y_TRYBLOCK_BEGIN + + if (!aText) + return E_INVALIDARG; + *aText = nullptr; + + if (mAccessible->IsDefunct()) + return CO_E_OBJNOTCONNECTED; + + nsAutoString nodeValue; + + nsCOMPtr<nsIDOMNode> DOMNode(do_QueryInterface(mAccessible->GetContent())); + DOMNode->GetNodeValue(nodeValue); + if (nodeValue.IsEmpty()) + return S_FALSE; + + *aText = ::SysAllocStringLen(nodeValue.get(), nodeValue.Length()); + return *aText ? S_OK : E_OUTOFMEMORY; + + A11Y_TRYBLOCK_END +} + +STDMETHODIMP +sdnTextAccessible::get_clippedSubstringBounds(unsigned int aStartIndex, + unsigned int aEndIndex, + int __RPC_FAR* aX, + int __RPC_FAR* aY, + int __RPC_FAR* aWidth, + int __RPC_FAR* aHeight) +{ + A11Y_TRYBLOCK_BEGIN + + nscoord x = 0, y = 0, width = 0, height = 0; + HRESULT rv = get_unclippedSubstringBounds(aStartIndex, aEndIndex, + &x, &y, &width, &height); + if (FAILED(rv)) + return rv; + + DocAccessible* document = mAccessible->Document(); + NS_ASSERTION(document, + "There must always be a doc accessible, but there isn't. Crash!"); + + nsIntRect docRect = document->Bounds(); + nsIntRect unclippedRect(x, y, width, height); + + nsIntRect clippedRect; + clippedRect.IntersectRect(unclippedRect, docRect); + + *aX = clippedRect.x; + *aY = clippedRect.y; + *aWidth = clippedRect.width; + *aHeight = clippedRect.height; + return S_OK; + + A11Y_TRYBLOCK_END +} + +STDMETHODIMP +sdnTextAccessible::get_unclippedSubstringBounds(unsigned int aStartIndex, + unsigned int aEndIndex, + int __RPC_FAR* aX, + int __RPC_FAR* aY, + int __RPC_FAR* aWidth, + int __RPC_FAR* aHeight) +{ + A11Y_TRYBLOCK_BEGIN + + if (!aX || !aY || !aWidth || !aHeight) + return E_INVALIDARG; + *aX = *aY = *aWidth = *aHeight = 0; + + if (mAccessible->IsDefunct()) + return CO_E_OBJNOTCONNECTED; + + nsIFrame *frame = mAccessible->GetFrame(); + NS_ENSURE_TRUE(frame, E_FAIL); + + nsPoint startPoint, endPoint; + nsIFrame* startFrame = GetPointFromOffset(frame, aStartIndex, true, startPoint); + nsIFrame* endFrame = GetPointFromOffset(frame, aEndIndex, false, endPoint); + if (!startFrame || !endFrame) + return E_FAIL; + + nsRect sum; + nsIFrame* iter = startFrame; + nsIFrame* stopLoopFrame = endFrame->GetNextContinuation(); + for (; iter != stopLoopFrame; iter = iter->GetNextContinuation()) { + nsRect rect = iter->GetScreenRectInAppUnits(); + nscoord start = (iter == startFrame) ? startPoint.x : 0; + nscoord end = (iter == endFrame) ? endPoint.x : rect.width; + rect.x += start; + rect.width = end - start; + sum.UnionRect(sum, rect); + } + + nsPresContext* presContext = mAccessible->Document()->PresContext(); + *aX = presContext->AppUnitsToDevPixels(sum.x); + *aY = presContext->AppUnitsToDevPixels(sum.y); + *aWidth = presContext->AppUnitsToDevPixels(sum.width); + *aHeight = presContext->AppUnitsToDevPixels(sum.height); + + return S_OK; + + A11Y_TRYBLOCK_END +} + +STDMETHODIMP +sdnTextAccessible::scrollToSubstring(unsigned int aStartIndex, + unsigned int aEndIndex) +{ + A11Y_TRYBLOCK_BEGIN + + if (mAccessible->IsDefunct()) + return CO_E_OBJNOTCONNECTED; + + RefPtr<nsRange> range = new nsRange(mAccessible->GetContent()); + if (NS_FAILED(range->SetStart(mAccessible->GetContent(), aStartIndex))) + return E_FAIL; + + if (NS_FAILED(range->SetEnd(mAccessible->GetContent(), aEndIndex))) + return E_FAIL; + + nsresult rv = + nsCoreUtils::ScrollSubstringTo(mAccessible->GetFrame(), range, + nsIAccessibleScrollType::SCROLL_TYPE_ANYWHERE); + return GetHRESULT(rv); + + A11Y_TRYBLOCK_END +} + +STDMETHODIMP +sdnTextAccessible::get_fontFamily(BSTR __RPC_FAR* aFontFamily) +{ + A11Y_TRYBLOCK_BEGIN + + if (!aFontFamily) + return E_INVALIDARG; + *aFontFamily = nullptr; + + if (mAccessible->IsDefunct()) + return CO_E_OBJNOTCONNECTED; + + nsIFrame* frame = mAccessible->GetFrame(); + if (!frame) + return E_FAIL; + + RefPtr<nsFontMetrics> fm = + nsLayoutUtils::GetFontMetricsForFrame(frame, 1.0f); + + const nsString& name = + fm->GetThebesFontGroup()->GetFirstValidFont()->GetName(); + if (name.IsEmpty()) + return S_FALSE; + + *aFontFamily = ::SysAllocStringLen(name.get(), name.Length()); + return *aFontFamily ? S_OK : E_OUTOFMEMORY; + + A11Y_TRYBLOCK_END +} + +nsIFrame* +sdnTextAccessible::GetPointFromOffset(nsIFrame* aContainingFrame, + int32_t aOffset, + bool aPreferNext, + nsPoint& aOutPoint) +{ + nsIFrame* textFrame = nullptr; + int32_t outOffset; + aContainingFrame->GetChildFrameContainingOffset(aOffset, aPreferNext, + &outOffset, &textFrame); + if (textFrame) + textFrame->GetPointFromOffset(aOffset, &aOutPoint); + + return textFrame; +} |