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qplatforminputcontext.cpp

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1 /**************************************************************************** -

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4 ** Contact: https://www.qt.io/licensing/ -

5 ** -

6 ** This file is part of the QtGui module of the Qt Toolkit. -

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25 ** GNU General Public License Usage -

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38 ****************************************************************************/ -

39 -

40 #include "qplatforminputcontext.h" -

41 #include <qguiapplication.h> -

42 #include <QRect> -

43 #include "private/qkeymapper_p.h" -

44 #include <qpa/qplatforminputcontext_p.h> -

45 -

46 #include <QtGui/qtransform.h> -

47 -

48 QT_BEGIN_NAMESPACE -

49 -

50 /*! -

51 \class QPlatformInputContext -

52 \since 5.0 -

53 \internal -

54 \preliminary -

55 \ingroup qpa -

56 \brief The QPlatformInputContext class abstracts the input method dependent data and composing state. -

57 -

58 An input method is responsible for inputting complex text that cannot -

59 be inputted via simple keymap. It converts a sequence of input -

60 events (typically key events) into a text string through the input -

61 method specific converting process. The class of the processes are -

62 widely ranging from simple finite state machine to complex text -

63 translator that pools a whole paragraph of a text with text -

64 editing capability to perform grammar and semantic analysis. -

65 -

66 To abstract such different input method specific intermediate -

67 information, Qt offers the QPlatformInputContext as base class. The -

68 concept is well known as 'input context' in the input method -

69 domain. An input context is created for a text widget in response -

70 to a demand. It is ensured that an input context is prepared for -

71 an input method before input to a text widget. -

72 -

73 QPlatformInputContext provides an interface the actual input methods -

74 can derive from by reimplementing methods. -

75 -

76 \sa QInputMethod -

77 */ -

78 -

79 /*! -

80 \internal -

81 */ -

82 QPlatformInputContext::QPlatformInputContext() -

83 : QObject(*(new QPlatformInputContextPrivate)) -

84 { -

}

never executed: end of block

86 -

87 /*! -

88 \internal -

89 */ -

90 QPlatformInputContext::~QPlatformInputContext() -

91 { -

92 } -

93 -

94 /*! -

95 Returns input context validity. Deriving implementations should return true. -

96 */ -

97 bool QPlatformInputContext::isValid() const -

98 { -

return false;

never executed: return false;

100 } -

101 -

102 /*! -

103 Returns whether the implementation supports \a capability. -

104 \internal -

105 \since 5.4 -

106 */ -

107 bool QPlatformInputContext::hasCapability(Capability capability) const -

108 { -

109 Q_UNUSED(capability) -

110

return true;

never executed: return true;

111 } -

112 -

113 /*! -

114 Method to be called when input method needs to be reset. Called by QInputMethod::reset(). -

115 No further QInputMethodEvents should be sent as response. -

116 */ -

117 void QPlatformInputContext::reset() -

118 { -

119 } -

120 -

121 void QPlatformInputContext::commit() -

122 { -

123 } -

124 -

125 /*! -

126 Notification on editor updates. Called by QInputMethod::update(). -

127 */ -

128 void QPlatformInputContext::update(Qt::InputMethodQueries) -

129 { -

130 } -

131 -

132 /*! -

133 Called when when the word currently being composed in input item is tapped by -

134 the user. Input methods often use this information to offer more word -

135 suggestions to the user. -

136 */ -

137 void QPlatformInputContext::invokeAction(QInputMethod::Action action, int cursorPosition) -

138 { -

139 Q_UNUSED(cursorPosition) -

140 // Default behavior for simple ephemeral input contexts. Some -

141 // complex input contexts should not be reset here. -

142

if (action == QInputMethod::Click)

action == QInputMethod::Click	Description
TRUE	never evaluated
FALSE	never evaluated

143

reset();

never executed: reset();

144

}

never executed: end of block

145 -

146 /*! -

147 This function can be reimplemented to filter input events. -

148 Return true if the event has been consumed. Otherwise, the unfiltered event will -

149 be forwarded to widgets as ordinary way. Although the input events have accept() -

150 and ignore() methods, leave it untouched. -

151 */ -

152 bool QPlatformInputContext::filterEvent(const QEvent *event) -

153 { -

154 Q_UNUSED(event) -

155

return false;

never executed: return false;

156 } -

157 -

158 /*! -

159 This function can be reimplemented to return virtual keyboard rectangle in currently active -

160 window coordinates. Default implementation returns invalid rectangle. -

161 */ -

162 QRectF QPlatformInputContext::keyboardRect() const -

163 { -

164

return QRectF();

never executed: return QRectF();

165 } -

166 -

167 /*! -

168 Active QPlatformInputContext is responsible for providing keyboardRectangle property to QInputMethod. -

169 In addition of providing the value in keyboardRect function, it also needs to call this emit -

170 function whenever the property changes. -

171 */ -

172 void QPlatformInputContext::emitKeyboardRectChanged() -

173 { -

174 emit QGuiApplication::inputMethod()->keyboardRectangleChanged(); -

175

}

never executed: end of block

176 -

177 /*! -

178 This function can be reimplemented to return true whenever input method is animating -

179 shown or hidden. Default implementation returns \c false. -

180 */ -

181 bool QPlatformInputContext::isAnimating() const -

182 { -

183

return false;

never executed: return false;

184 } -

185 -

186 /*! -

187 Active QPlatformInputContext is responsible for providing animating property to QInputMethod. -

188 In addition of providing the value in isAnimation function, it also needs to call this emit -

189 function whenever the property changes. -

190 */ -

191 void QPlatformInputContext::emitAnimatingChanged() -

192 { -

193 emit QGuiApplication::inputMethod()->animatingChanged(); -

194

}

never executed: end of block

195 -

196 /*! -

197 Request to show input panel. -

198 */ -

199 void QPlatformInputContext::showInputPanel() -

200 { -

201 } -

202 -

203 /*! -

204 Request to hide input panel. -

205 */ -

206 void QPlatformInputContext::hideInputPanel() -

207 { -

208 } -

209 -

210 /*! -

211 Returns input panel visibility status. Default implementation returns \c false. -

212 */ -

213 bool QPlatformInputContext::isInputPanelVisible() const -

214 { -

215

return false;

never executed: return false;

216 } -

217 -

218 /*! -

219 Active QPlatformInputContext is responsible for providing visible property to QInputMethod. -

220 In addition of providing the value in isInputPanelVisible function, it also needs to call this emit -

221 function whenever the property changes. -

222 */ -

223 void QPlatformInputContext::emitInputPanelVisibleChanged() -

224 { -

225 emit QGuiApplication::inputMethod()->visibleChanged(); -

226

}

never executed: end of block

227 -

228 QLocale QPlatformInputContext::locale() const -

229 { -

230

return qt_keymapper_private()->keyboardInputLocale;

never executed: return qt_keymapper_private()->keyboardInputLocale;

231 } -

232 -

233 void QPlatformInputContext::emitLocaleChanged() -

234 { -

235 emit QGuiApplication::inputMethod()->localeChanged(); -

236

}

never executed: end of block

237 -

238 Qt::LayoutDirection QPlatformInputContext::inputDirection() const -

239 { -

240

return qt_keymapper_private()->keyboardInputDirection;

never executed: return qt_keymapper_private()->keyboardInputDirection;

241 } -

242 -

243 void QPlatformInputContext::emitInputDirectionChanged(Qt::LayoutDirection newDirection) -

244 { -

245 emit QGuiApplication::inputMethod()->inputDirectionChanged(newDirection); -

246

}

never executed: end of block

247 -

248 /*! -

249 This virtual method gets called to notify updated focus to \a object. -

250 \warning Input methods must not call this function directly. -

251 */ -

252 void QPlatformInputContext::setFocusObject(QObject *object) -

253 { -

254 Q_UNUSED(object) -

255

}

never executed: end of block

256 -

257 /*! -

258 Returns \c true if current focus object supports input method events. -

259 */ -

260 bool QPlatformInputContext::inputMethodAccepted() const -

261 { -

262

return QPlatformInputContextPrivate::s_inputMethodAccepted;

never executed: return QPlatformInputContextPrivate::s_inputMethodAccepted;

263 } -

264 -

265 bool QPlatformInputContextPrivate::s_inputMethodAccepted = false; -

266 -

267 void QPlatformInputContextPrivate::setInputMethodAccepted(bool accepted) -

268 { -

269 QPlatformInputContextPrivate::s_inputMethodAccepted = accepted; -

270

}

never executed: end of block

271 -

272 /*! -

273 * \brief QPlatformInputContext::setSelectionOnFocusObject -

274 * \param anchorPos Beginning of selection in currently active window coordinates -

275 * \param cursorPos End of selection in currently active window coordinates -

276 */ -

277 void QPlatformInputContext::setSelectionOnFocusObject(const QPointF &anchorPos, const QPointF &cursorPos) -

278 { -

279 QObject *focus = qApp->focusObject(); -

280

if (!focus)

!focus	Description
TRUE	never evaluated
FALSE	never evaluated

281

return;

never executed: return;

282 -

283 QInputMethod *im = QGuiApplication::inputMethod(); -

284 const QTransform mapToLocal = im->inputItemTransform().inverted(); -

285 bool success; -

286 int anchor = QInputMethod::queryFocusObject(Qt::ImCursorPosition, anchorPos * mapToLocal).toInt(&success); -

287

if (success) {

success	Description
TRUE	never evaluated
FALSE	never evaluated

288 int cursor = QInputMethod::queryFocusObject(Qt::ImCursorPosition, cursorPos * mapToLocal).toInt(&success); -

289

if (success) {

success	Description
TRUE	never evaluated
FALSE	never evaluated

290 QList<QInputMethodEvent::Attribute> imAttributes; -

291 imAttributes.append(QInputMethodEvent::Attribute(QInputMethodEvent::Selection, anchor, cursor - anchor, QVariant())); -

292 QInputMethodEvent event(QString(), imAttributes); -

293 QGuiApplication::sendEvent(focus, &event); -

294

}

never executed: end of block

295

}

never executed: end of block

296

}

never executed: end of block

297 -

298 QT_END_NAMESPACE -

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