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Diffstat (limited to '')
| -rw-r--r-- | accessible/windows/sdn/sdnTextAccessible.cpp | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/accessible/windows/sdn/sdnTextAccessible.cpp b/accessible/windows/sdn/sdnTextAccessible.cpp new file mode 100644 index 0000000000..73ef4eb6e8 --- /dev/null +++ b/accessible/windows/sdn/sdnTextAccessible.cpp @@ -0,0 +1,166 @@ +/* -*- 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 "ISimpleDOM.h" + +#include "nsCoreUtils.h" +#include "DocAccessible.h" + +#include "nsIFrame.h" +#include "nsFontMetrics.h" +#include "nsPresContext.h" +#include "nsLayoutUtils.h" +#include "nsRange.h" +#include "gfxTextRun.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(mMsaa) + +STDMETHODIMP +sdnTextAccessible::get_domText(BSTR __RPC_FAR* aText) { + if (!aText) return E_INVALIDARG; + *aText = nullptr; + + AccessibleWrap* acc = mMsaa->LocalAcc(); + if (!acc) return CO_E_OBJNOTCONNECTED; + + nsAutoString nodeValue; + + acc->GetContent()->GetNodeValue(nodeValue); + if (nodeValue.IsEmpty()) return S_FALSE; + + *aText = ::SysAllocStringLen(nodeValue.get(), nodeValue.Length()); + return *aText ? S_OK : E_OUTOFMEMORY; +} + +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) { + 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 = mMsaa->LocalAcc()->Document(); + NS_ASSERTION( + document, + "There must always be a doc accessible, but there isn't. Crash!"); + + LayoutDeviceIntRect docRect = document->Bounds(); + LayoutDeviceIntRect unclippedRect(x, y, width, height); + + LayoutDeviceIntRect clippedRect; + clippedRect.IntersectRect(unclippedRect, docRect); + + *aX = clippedRect.X(); + *aY = clippedRect.Y(); + *aWidth = clippedRect.Width(); + *aHeight = clippedRect.Height(); + return S_OK; +} + +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) { + if (!aX || !aY || !aWidth || !aHeight) return E_INVALIDARG; + *aX = *aY = *aWidth = *aHeight = 0; + + AccessibleWrap* acc = mMsaa->LocalAcc(); + if (!acc) return CO_E_OBJNOTCONNECTED; + + nsIFrame* frame = acc->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.MoveByX(start); + rect.SetWidth(end - start); + sum.UnionRect(sum, rect); + } + + nsPresContext* presContext = acc->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; +} + +STDMETHODIMP +sdnTextAccessible::scrollToSubstring(unsigned int aStartIndex, + unsigned int aEndIndex) { + AccessibleWrap* acc = mMsaa->LocalAcc(); + if (!acc) return CO_E_OBJNOTCONNECTED; + + RefPtr<nsRange> range = nsRange::Create(acc->GetContent()); + if (NS_FAILED(range->SetStart(acc->GetContent(), aStartIndex))) return E_FAIL; + + if (NS_FAILED(range->SetEnd(acc->GetContent(), aEndIndex))) return E_FAIL; + + nsresult rv = nsCoreUtils::ScrollSubstringTo( + acc->GetFrame(), range, nsIAccessibleScrollType::SCROLL_TYPE_ANYWHERE); + return GetHRESULT(rv); +} + +STDMETHODIMP +sdnTextAccessible::get_fontFamily(BSTR __RPC_FAR* aFontFamily) { + if (!aFontFamily) return E_INVALIDARG; + *aFontFamily = nullptr; + + AccessibleWrap* acc = mMsaa->LocalAcc(); + if (!acc) return CO_E_OBJNOTCONNECTED; + + nsIFrame* frame = acc->GetFrame(); + if (!frame) return E_FAIL; + + RefPtr<nsFontMetrics> fm = nsLayoutUtils::GetFontMetricsForFrame(frame, 1.0f); + RefPtr<gfxFont> font = fm->GetThebesFontGroup()->GetFirstValidFont(); + + const nsCString& name = font->GetName(); + if (name.IsEmpty()) return S_FALSE; + + NS_ConvertUTF8toUTF16 str(name); + *aFontFamily = ::SysAllocStringLen(str.get(), str.Length()); + return *aFontFamily ? S_OK : E_OUTOFMEMORY; +} + +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; +} |