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39#include "qcomposeplatforminputcontext.h"
40
41#include <QtCore/QCoreApplication>
42#include <QtGui/QKeyEvent>
43#include <QtGui/QGuiApplication>
44
45#include <locale.h>
46
47QT_BEGIN_NAMESPACE
48
49Q_LOGGING_CATEGORY(lcXkbCompose, "qt.xkb.compose")
50
51QComposeInputContext::QComposeInputContext()
52{
53 setObjectName(QStringLiteral("QComposeInputContext"));
54 qCDebug(lcXkbCompose, "using xkb compose input context");
55}
56
57QComposeInputContext::~QComposeInputContext()
58{
59 xkb_compose_state_unref(m_composeState);
60 xkb_compose_table_unref(m_composeTable);
61}
62
63void QComposeInputContext::ensureInitialized()
64{
65 if (m_initialized)
66 return;
67
68 if (!m_XkbContext) {
69 qCWarning(lcXkbCompose) << "error: xkb context has not been set on" << metaObject()->className();
70 return;
71 }
72
73 m_initialized = true;
74 const char *locale = setlocale(LC_CTYPE, "");
75 if (!locale)
76 locale = setlocale(LC_CTYPE, nullptr);
77 qCDebug(lcXkbCompose) << "detected locale (LC_CTYPE):" << locale;
78
79 m_composeTable = xkb_compose_table_new_from_locale(m_XkbContext, locale, XKB_COMPOSE_COMPILE_NO_FLAGS);
80 if (m_composeTable)
81 m_composeState = xkb_compose_state_new(m_composeTable, XKB_COMPOSE_STATE_NO_FLAGS);
82
83 if (!m_composeTable) {
84 qCWarning(lcXkbCompose, "failed to create compose table");
85 return;
86 }
87 if (!m_composeState) {
88 qCWarning(lcXkbCompose, "failed to create compose state");
89 return;
90 }
91}
92
93bool QComposeInputContext::filterEvent(const QEvent *event)
94{
95 auto keyEvent = static_cast<const QKeyEvent *>(event);
96 if (keyEvent->type() != QEvent::KeyPress)
97 return false;
98
99 if (!inputMethodAccepted())
100 return false;
101
102 // lazy initialization - we don't want to do this on an app startup
103 ensureInitialized();
104
105 if (!m_composeTable || !m_composeState)
106 return false;
107
108 xkb_compose_state_feed(m_composeState, keyEvent->nativeVirtualKey());
109
110 switch (xkb_compose_state_get_status(m_composeState)) {
111 case XKB_COMPOSE_COMPOSING:
112 return true;
113 case XKB_COMPOSE_CANCELLED:
114 reset();
115 return false;
116 case XKB_COMPOSE_COMPOSED:
117 {
118 const int size = xkb_compose_state_get_utf8(m_composeState, nullptr, 0);
119 QVarLengthArray<char, 32> buffer(size + 1);
120 xkb_compose_state_get_utf8(m_composeState, buffer.data(), buffer.size());
121 QString composedText = QString::fromUtf8(buffer.constData());
122
123 QInputMethodEvent event;
124 event.setCommitString(composedText);
125
126 if (!m_focusObject && qApp)
127 m_focusObject = qApp->focusObject();
128
129 if (m_focusObject)
130 QCoreApplication::sendEvent(m_focusObject, &event);
131 else
132 qCWarning(lcXkbCompose, "no focus object");
133
134 reset();
135 return true;
136 }
137 case XKB_COMPOSE_NOTHING:
138 return false;
139 default:
140 Q_UNREACHABLE();
141 return false;
142 }
143}
144
145bool QComposeInputContext::isValid() const
146{
147 return true;
148}
149
150void QComposeInputContext::setFocusObject(QObject *object)
151{
152 m_focusObject = object;
153}
154
155void QComposeInputContext::reset()
156{
157 if (m_composeState)
158 xkb_compose_state_reset(m_composeState);
159}
160
161void QComposeInputContext::update(Qt::InputMethodQueries q)
162{
163 QPlatformInputContext::update(q);
164}
165
166QT_END_NAMESPACE
167