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accessible/src/windows/sdn/sdnTextAccessible.cpp@97036ab72558 (annotated)

accessible/src/windows/sdn/sdnTextAccessible.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Tue, 06 Jan 2015 21:39:09 +0100

branch

TOR_BUG_9701

changeset 8

97036ab72558

permissions

-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0	2	/* vim: set ts=2 et sw=2 tw=80: */
michael@0	3	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	4	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	5	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	6
michael@0	7	#include "sdnTextAccessible.h"
michael@0	8
michael@0	9	#include "ISimpleDOMText_i.c"
michael@0	10
michael@0	11	#include "nsCoreUtils.h"
michael@0	12	#include "DocAccessible.h"
michael@0	13
michael@0	14	#include "nsIFrame.h"
michael@0	15	#include "nsFontMetrics.h"
michael@0	16	#include "nsPresContext.h"
michael@0	17	#include "nsLayoutUtils.h"
michael@0	18	#include "gfxFont.h"
michael@0	19	#include "nsIAccessibleTypes.h"
michael@0	20	#include "mozilla/gfx/2D.h"
michael@0	21
michael@0	22	using namespace mozilla::a11y;
michael@0	23
michael@0	24	////////////////////////////////////////////////////////////////////////////////
michael@0	25	// sdnTextAccessible
michael@0	26	////////////////////////////////////////////////////////////////////////////////
michael@0	27
michael@0	28	IMPL_IUNKNOWN_QUERY_HEAD(sdnTextAccessible)
michael@0	29	IMPL_IUNKNOWN_QUERY_IFACE(ISimpleDOMText)
michael@0	30	IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(mAccessible)
michael@0	31
michael@0	32	STDMETHODIMP
michael@0	33	sdnTextAccessible::get_domText(BSTR __RPC_FAR* aText)
michael@0	34	{
michael@0	35	A11Y_TRYBLOCK_BEGIN
michael@0	36
michael@0	37	if (!aText)
michael@0	38	return E_INVALIDARG;
michael@0	39	*aText = nullptr;
michael@0	40
michael@0	41	if (mAccessible->IsDefunct())
michael@0	42	return CO_E_OBJNOTCONNECTED;
michael@0	43
michael@0	44	nsAutoString nodeValue;
michael@0	45
michael@0	46	nsCOMPtr<nsIDOMNode> DOMNode(do_QueryInterface(mAccessible->GetContent()));
michael@0	47	DOMNode->GetNodeValue(nodeValue);
michael@0	48	if (nodeValue.IsEmpty())
michael@0	49	return S_FALSE;
michael@0	50
michael@0	51	*aText = ::SysAllocStringLen(nodeValue.get(), nodeValue.Length());
michael@0	52	return *aText ? S_OK : E_OUTOFMEMORY;
michael@0	53
michael@0	54	A11Y_TRYBLOCK_END
michael@0	55	}
michael@0	56
michael@0	57	STDMETHODIMP
michael@0	58	sdnTextAccessible::get_clippedSubstringBounds(unsigned int aStartIndex,
michael@0	59	unsigned int aEndIndex,
michael@0	60	int __RPC_FAR* aX,
michael@0	61	int __RPC_FAR* aY,
michael@0	62	int __RPC_FAR* aWidth,
michael@0	63	int __RPC_FAR* aHeight)
michael@0	64	{
michael@0	65	A11Y_TRYBLOCK_BEGIN
michael@0	66
michael@0	67	nscoord x = 0, y = 0, width = 0, height = 0;
michael@0	68	HRESULT rv = get_unclippedSubstringBounds(aStartIndex, aEndIndex,
michael@0	69	&x, &y, &width, &height);
michael@0	70	if (FAILED(rv))
michael@0	71	return rv;
michael@0	72
michael@0	73	DocAccessible* document = mAccessible->Document();
michael@0	74	NS_ASSERTION(document,
michael@0	75	"There must always be a doc accessible, but there isn't. Crash!");
michael@0	76
michael@0	77	nscoord docX = 0, docY = 0, docWidth = 0, docHeight = 0;
michael@0	78	document->GetBounds(&docX, &docY, &docWidth, &docHeight);
michael@0	79
michael@0	80	nsIntRect unclippedRect(x, y, width, height);
michael@0	81	nsIntRect docRect(docX, docY, docWidth, docHeight);
michael@0	82
michael@0	83	nsIntRect clippedRect;
michael@0	84	clippedRect.IntersectRect(unclippedRect, docRect);
michael@0	85
michael@0	86	*aX = clippedRect.x;
michael@0	87	*aY = clippedRect.y;
michael@0	88	*aWidth = clippedRect.width;
michael@0	89	*aHeight = clippedRect.height;
michael@0	90	return S_OK;
michael@0	91
michael@0	92	A11Y_TRYBLOCK_END
michael@0	93	}
michael@0	94
michael@0	95	STDMETHODIMP
michael@0	96	sdnTextAccessible::get_unclippedSubstringBounds(unsigned int aStartIndex,
michael@0	97	unsigned int aEndIndex,
michael@0	98	int __RPC_FAR* aX,
michael@0	99	int __RPC_FAR* aY,
michael@0	100	int __RPC_FAR* aWidth,
michael@0	101	int __RPC_FAR* aHeight)
michael@0	102	{
michael@0	103	A11Y_TRYBLOCK_BEGIN
michael@0	104
michael@0	105	if (!aX || !aY || !aWidth || !aHeight)
michael@0	106	return E_INVALIDARG;
michael@0	107	*aX = *aY = *aWidth = *aHeight = 0;
michael@0	108
michael@0	109	if (mAccessible->IsDefunct())
michael@0	110	return CO_E_OBJNOTCONNECTED;
michael@0	111
michael@0	112	nsIFrame *frame = mAccessible->GetFrame();
michael@0	113	NS_ENSURE_TRUE(frame, E_FAIL);
michael@0	114
michael@0	115	nsPoint startPoint, endPoint;
michael@0	116	nsIFrame* startFrame = GetPointFromOffset(frame, aStartIndex, true, startPoint);
michael@0	117	nsIFrame* endFrame = GetPointFromOffset(frame, aEndIndex, false, endPoint);
michael@0	118	if (!startFrame || !endFrame)
michael@0	119	return E_FAIL;
michael@0	120
michael@0	121	nsRect sum;
michael@0	122	nsIFrame* iter = startFrame;
michael@0	123	nsIFrame* stopLoopFrame = endFrame->GetNextContinuation();
michael@0	124	for (; iter != stopLoopFrame; iter = iter->GetNextContinuation()) {
michael@0	125	nsRect rect = iter->GetScreenRectInAppUnits();
michael@0	126	nscoord start = (iter == startFrame) ? startPoint.x : 0;
michael@0	127	nscoord end = (iter == endFrame) ? endPoint.x : rect.width;
michael@0	128	rect.x += start;
michael@0	129	rect.width = end - start;
michael@0	130	sum.UnionRect(sum, rect);
michael@0	131	}
michael@0	132
michael@0	133	nsPresContext* presContext = mAccessible->Document()->PresContext();
michael@0	134	*aX = presContext->AppUnitsToDevPixels(sum.x);
michael@0	135	*aY = presContext->AppUnitsToDevPixels(sum.y);
michael@0	136	*aWidth = presContext->AppUnitsToDevPixels(sum.width);
michael@0	137	*aHeight = presContext->AppUnitsToDevPixels(sum.height);
michael@0	138
michael@0	139	return S_OK;
michael@0	140
michael@0	141	A11Y_TRYBLOCK_END
michael@0	142	}
michael@0	143
michael@0	144	STDMETHODIMP
michael@0	145	sdnTextAccessible::scrollToSubstring(unsigned int aStartIndex,
michael@0	146	unsigned int aEndIndex)
michael@0	147	{
michael@0	148	A11Y_TRYBLOCK_BEGIN
michael@0	149
michael@0	150	if (mAccessible->IsDefunct())
michael@0	151	return CO_E_OBJNOTCONNECTED;
michael@0	152
michael@0	153	nsRefPtr<nsRange> range = new nsRange(mAccessible->GetContent());
michael@0	154	if (NS_FAILED(range->SetStart(mAccessible->GetContent(), aStartIndex)))
michael@0	155	return E_FAIL;
michael@0	156
michael@0	157	if (NS_FAILED(range->SetEnd(mAccessible->GetContent(), aEndIndex)))
michael@0	158	return E_FAIL;
michael@0	159
michael@0	160	nsresult rv =
michael@0	161	nsCoreUtils::ScrollSubstringTo(mAccessible->GetFrame(), range,
michael@0	162	nsIAccessibleScrollType::SCROLL_TYPE_ANYWHERE);
michael@0	163	return GetHRESULT(rv);
michael@0	164
michael@0	165	A11Y_TRYBLOCK_END
michael@0	166	}
michael@0	167
michael@0	168	STDMETHODIMP
michael@0	169	sdnTextAccessible::get_fontFamily(BSTR __RPC_FAR* aFontFamily)
michael@0	170	{
michael@0	171	A11Y_TRYBLOCK_BEGIN
michael@0	172
michael@0	173	if (!aFontFamily)
michael@0	174	return E_INVALIDARG;
michael@0	175	*aFontFamily = nullptr;
michael@0	176
michael@0	177	if (mAccessible->IsDefunct())
michael@0	178	return CO_E_OBJNOTCONNECTED;
michael@0	179
michael@0	180	nsIFrame* frame = mAccessible->GetFrame();
michael@0	181	if (!frame)
michael@0	182	return E_FAIL;
michael@0	183
michael@0	184	nsRefPtr<nsFontMetrics> fm;
michael@0	185	nsLayoutUtils::GetFontMetricsForFrame(frame, getter_AddRefs(fm));
michael@0	186
michael@0	187	const nsString& name = fm->GetThebesFontGroup()->GetFontAt(0)->GetName();
michael@0	188	if (name.IsEmpty())
michael@0	189	return S_FALSE;
michael@0	190
michael@0	191	*aFontFamily = ::SysAllocStringLen(name.get(), name.Length());
michael@0	192	return *aFontFamily ? S_OK : E_OUTOFMEMORY;
michael@0	193
michael@0	194	A11Y_TRYBLOCK_END
michael@0	195	}
michael@0	196
michael@0	197	nsIFrame*
michael@0	198	sdnTextAccessible::GetPointFromOffset(nsIFrame* aContainingFrame,
michael@0	199	int32_t aOffset,
michael@0	200	bool aPreferNext,
michael@0	201	nsPoint& aOutPoint)
michael@0	202	{
michael@0	203	nsIFrame* textFrame = nullptr;
michael@0	204	int32_t outOffset;
michael@0	205	aContainingFrame->GetChildFrameContainingOffset(aOffset, aPreferNext,
michael@0	206	&outOffset, &textFrame);
michael@0	207	if (textFrame)
michael@0	208	textFrame->GetPointFromOffset(aOffset, &aOutPoint);
michael@0	209
michael@0	210	return textFrame;
michael@0	211	}