1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=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 "MiddleCroppingBlockFrame.h"
#include "nsTextFrame.h"
#include "nsLayoutUtils.h"
#include "nsTextNode.h"
#include "nsLineLayout.h"
#include "gfxContext.h"
#include "mozilla/dom/Document.h"
#include "mozilla/intl/Segmenter.h"
#include "mozilla/ReflowInput.h"
#include "mozilla/ReflowOutput.h"
namespace mozilla {
NS_QUERYFRAME_HEAD(MiddleCroppingBlockFrame)
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_ENTRY(MiddleCroppingBlockFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrame)
MiddleCroppingBlockFrame::MiddleCroppingBlockFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext,
ClassID aClassID)
: nsBlockFrame(aStyle, aPresContext, aClassID) {}
MiddleCroppingBlockFrame::~MiddleCroppingBlockFrame() = default;
void MiddleCroppingBlockFrame::UpdateDisplayedValue(const nsAString& aValue,
bool aIsCropped,
bool aNotify) {
auto* text = mTextNode.get();
uint32_t oldLength = aNotify ? 0 : text->TextLength();
text->SetText(aValue, aNotify);
if (!aNotify) {
// We can't notify during Reflow so we need to tell the text frame about the
// text content change we just did.
if (auto* textFrame = static_cast<nsTextFrame*>(text->GetPrimaryFrame())) {
textFrame->NotifyNativeAnonymousTextnodeChange(oldLength);
}
if (LinesBegin() != LinesEnd()) {
AddStateBits(NS_BLOCK_NEEDS_BIDI_RESOLUTION);
LinesBegin()->MarkDirty();
}
}
mCropped = aIsCropped;
}
void MiddleCroppingBlockFrame::UpdateDisplayedValueToUncroppedValue(
bool aNotify) {
nsAutoString value;
GetUncroppedValue(value);
UpdateDisplayedValue(value, /* aIsCropped = */ false, aNotify);
}
nscoord MiddleCroppingBlockFrame::GetMinISize(gfxContext* aRenderingContext) {
// Our min inline size is our pref inline size
return GetPrefISize(aRenderingContext);
}
nscoord MiddleCroppingBlockFrame::GetPrefISize(gfxContext* aRenderingContext) {
nsAutoString prevValue;
bool restoreOldValue = false;
// Make sure we measure with the uncropped value.
if (mCropped && mCachedPrefISize == NS_INTRINSIC_ISIZE_UNKNOWN) {
mTextNode->GetNodeValue(prevValue);
restoreOldValue = true;
UpdateDisplayedValueToUncroppedValue(false);
}
nscoord result = nsBlockFrame::GetPrefISize(aRenderingContext);
if (restoreOldValue) {
UpdateDisplayedValue(prevValue, /* aIsCropped = */ true, false);
}
return result;
}
bool MiddleCroppingBlockFrame::CropTextToWidth(gfxContext& aRenderingContext,
nscoord aWidth,
nsString& aText) const {
if (aText.IsEmpty()) {
return false;
}
RefPtr<nsFontMetrics> fm = nsLayoutUtils::GetFontMetricsForFrame(this, 1.0f);
// see if the text will completely fit in the width given
if (nsLayoutUtils::AppUnitWidthOfStringBidi(aText, this, *fm,
aRenderingContext) <= aWidth) {
return false;
}
DrawTarget* drawTarget = aRenderingContext.GetDrawTarget();
const nsDependentString& kEllipsis = nsContentUtils::GetLocalizedEllipsis();
// see if the width is even smaller than the ellipsis
fm->SetTextRunRTL(false);
const nscoord ellipsisWidth =
nsLayoutUtils::AppUnitWidthOfString(kEllipsis, *fm, drawTarget);
if (ellipsisWidth >= aWidth) {
aText = kEllipsis;
return true;
}
// determine how much of the string will fit in the max width
nscoord totalWidth = ellipsisWidth;
const Span text(aText);
intl::GraphemeClusterBreakIteratorUtf16 leftIter(text);
intl::GraphemeClusterBreakReverseIteratorUtf16 rightIter(text);
uint32_t leftPos = 0;
uint32_t rightPos = aText.Length();
nsAutoString leftString, rightString;
while (leftPos < rightPos) {
Maybe<uint32_t> pos = leftIter.Next();
Span chars = text.FromTo(leftPos, *pos);
nscoord charWidth =
nsLayoutUtils::AppUnitWidthOfString(chars, *fm, drawTarget);
if (totalWidth + charWidth > aWidth) {
break;
}
leftString.Append(chars);
leftPos = *pos;
totalWidth += charWidth;
if (leftPos >= rightPos) {
break;
}
pos = rightIter.Next();
chars = text.FromTo(*pos, rightPos);
charWidth = nsLayoutUtils::AppUnitWidthOfString(chars, *fm, drawTarget);
if (totalWidth + charWidth > aWidth) {
break;
}
rightString.Insert(chars, 0);
rightPos = *pos;
totalWidth += charWidth;
}
aText = leftString + kEllipsis + rightString;
return true;
}
void MiddleCroppingBlockFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
// Restore the uncropped value.
nsAutoString value;
GetUncroppedValue(value);
bool cropped = false;
while (true) {
UpdateDisplayedValue(value, cropped, false); // update the text node
AddStateBits(NS_BLOCK_NEEDS_BIDI_RESOLUTION);
LinesBegin()->MarkDirty();
nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
if (cropped) {
break;
}
nscoord currentICoord = aReflowInput.mLineLayout
? aReflowInput.mLineLayout->GetCurrentICoord()
: 0;
const nscoord availSize = aReflowInput.AvailableISize() - currentICoord;
const nscoord sizeToFit = std::min(aReflowInput.ComputedISize(), availSize);
if (LinesBegin()->ISize() > sizeToFit) {
// The value overflows - crop it and reflow again (once).
if (CropTextToWidth(*aReflowInput.mRenderingContext, sizeToFit, value)) {
nsBlockFrame::DidReflow(aPresContext, &aReflowInput);
aStatus.Reset();
MarkSubtreeDirty();
AddStateBits(NS_BLOCK_NEEDS_BIDI_RESOLUTION);
mCachedMinISize = NS_INTRINSIC_ISIZE_UNKNOWN;
mCachedPrefISize = NS_INTRINSIC_ISIZE_UNKNOWN;
cropped = true;
continue;
}
}
break;
}
}
nsresult MiddleCroppingBlockFrame::CreateAnonymousContent(
nsTArray<ContentInfo>& aContent) {
auto* doc = PresContext()->Document();
mTextNode = new (doc->NodeInfoManager()) nsTextNode(doc->NodeInfoManager());
// Update the displayed text to reflect the current element's value.
UpdateDisplayedValueToUncroppedValue(false);
aContent.AppendElement(mTextNode);
return NS_OK;
}
void MiddleCroppingBlockFrame::AppendAnonymousContentTo(
nsTArray<nsIContent*>& aContent, uint32_t aFilter) {
aContent.AppendElement(mTextNode);
}
void MiddleCroppingBlockFrame::Destroy(DestroyContext& aContext) {
aContext.AddAnonymousContent(mTextNode.forget());
nsBlockFrame::Destroy(aContext);
}
} // namespace mozilla
|
