blob: 70ec6b01ea8ad1b5f04d923926d6509c275364b1 (
plain)
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
|
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QFont>
#include <QFontMetrics>
#include <QPainter>
#include <QTextLayout>
#include <QTextLine>
namespace src_gui_text_qtextlayout {
struct Wrapper : public QPaintDevice
{
void wrapper1();
void elided();
};
QTextLayout textLayout;
void wrapper0() {
qreal lineWidth = 0;
QFont aFont;
QFontMetrics fontMetrics(aFont);
//! [0]
int leading = fontMetrics.leading();
qreal height = 0;
textLayout.setCacheEnabled(true);
textLayout.beginLayout();
while (true) {
QTextLine line = textLayout.createLine();
if (!line.isValid())
break;
line.setLineWidth(lineWidth);
height += leading;
line.setPosition(QPointF(0, height));
height += line.height();
}
textLayout.endLayout();
//! [0]
} // wrapper0
void Wrapper::wrapper1() {
//! [1]
QPainter painter(this);
textLayout.draw(&painter, QPoint(0, 0));
//! [1]
} // Wrapper::wrapper1
void Wrapper::elided() {
QString content;
//! [elided]
QPainter painter(this);
QFontMetrics fontMetrics = painter.fontMetrics();
int lineSpacing = fontMetrics.lineSpacing();
int y = 0;
QTextLayout textLayout(content, painter.font());
textLayout.beginLayout();
while (true) {
QTextLine line = textLayout.createLine();
if (!line.isValid())
break;
line.setLineWidth(width());
const int nextLineY = y + lineSpacing;
if (height() >= nextLineY + lineSpacing) {
line.draw(&painter, QPoint(0, y));
y = nextLineY;
} else {
const QString lastLine = content.mid(line.textStart());
const QString elidedLastLine = fontMetrics.elidedText(lastLine, Qt::ElideRight, width());
painter.drawText(QPoint(0, y + fontMetrics.ascent()), elidedLastLine);
line = textLayout.createLine();
break;
}
}
textLayout.endLayout();
//! [elided]
}
} // src_gui_text_qtextlayout
|
