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39
40#include "qtouchoutputmapping_p.h"
41#include <QFile>
42#include <QVariantMap>
43#include <QJsonDocument>
44#include <QJsonObject>
45#include <QJsonArray>
46
47QT_BEGIN_NAMESPACE
48
49bool QTouchOutputMapping::load()
50{
51 static QByteArray configFile = qgetenv(varName: "QT_QPA_EGLFS_KMS_CONFIG");
52 if (configFile.isEmpty())
53 return false;
54
55 QFile file(QString::fromUtf8(str: configFile));
56 if (!file.open(flags: QFile::ReadOnly)) {
57 qWarning(msg: "touch input support: Failed to open %s", configFile.constData());
58 return false;
59 }
60
61 const QJsonDocument doc = QJsonDocument::fromJson(json: file.readAll());
62 if (!doc.isObject()) {
63 qWarning(msg: "touch input support: Failed to parse %s", configFile.constData());
64 return false;
65 }
66
67 // What we are interested is the virtualIndex and touchDevice properties for
68 // each element in the outputs array.
69 const QJsonArray outputs = doc.object().value(key: QLatin1String("outputs")).toArray();
70 for (int i = 0; i < outputs.size(); ++i) {
71 const QVariantMap output = outputs.at(i).toObject().toVariantMap();
72 if (!output.contains(QStringLiteral("touchDevice")))
73 continue;
74 if (!output.contains(QStringLiteral("name"))) {
75 qWarning(msg: "evdevtouch: Output %d specifies touchDevice but not name, this is wrong", i);
76 continue;
77 }
78 const QString &deviceNode = output.value(QStringLiteral("touchDevice")).toString();
79 const QString &screenName = output.value(QStringLiteral("name")).toString();
80 m_screenTable.insert(akey: deviceNode, avalue: screenName);
81 }
82
83 return true;
84}
85
86QString QTouchOutputMapping::screenNameForDeviceNode(const QString &deviceNode)
87{
88 return m_screenTable.value(akey: deviceNode);
89}
90
91QT_END_NAMESPACE
92

source code of qtbase/src/platformsupport/input/shared/qtouchoutputmapping.cpp