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/*
KWin - the KDE window manager
This file is part of the KDE project.
SPDX-FileCopyrightText: 2024 David Edmundson <davidedmundson@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "internalinputmethodcontext.h"
#include <QGuiApplication>
#include <QInputMethodEvent>
#include <QObject>
#include <QRect>
#include <QTextCharFormat>
#include <QWindow>
namespace KWin {
InternalInputMethodContext::InternalInputMethodContext(QObject *parent)
: QPlatformInputContext()
{
setParent(parent);
}
InternalInputMethodContext::~InternalInputMethodContext()
{
}
bool InternalInputMethodContext::isEnabled() const
{
return QGuiApplication::focusObject() != nullptr;
}
QString InternalInputMethodContext::surroundingText() const
{
return m_surroundingText;
}
int InternalInputMethodContext::cursorPosition() const
{
return m_cursorPos;
}
int InternalInputMethodContext::anchorPosition() const
{
return m_anchorPos;
}
bool InternalInputMethodContext::isValid() const
{
return true;
}
void InternalInputMethodContext::update(Qt::InputMethodQueries queries)
{
if (!QGuiApplication::focusObject()) {
return;
}
QInputMethodQueryEvent event(queries);
QCoreApplication::sendEvent(QGuiApplication::focusObject(), &event);
if ((queries & Qt::ImSurroundingText) || (queries & Qt::ImCursorPosition) || (queries & Qt::ImAnchorPosition)) {
m_surroundingText = event.value(Qt::ImSurroundingText).toString();
m_cursorPos = event.value(Qt::ImCursorPosition).toInt();
m_anchorPos = event.value(Qt::ImAnchorPosition).toInt();
Q_EMIT surroundingTextChanged();
}
if (queries & Qt::ImHints) {
// When kwin gets some text input with numbers and passwords this needs pouplating
}
if (queries & Qt::ImEnabled) {
Q_EMIT enabledChanged();
}
}
void InternalInputMethodContext::showInputPanel()
{
Q_EMIT showInputPanelRequested();
}
void InternalInputMethodContext::hideInputPanel()
{
Q_EMIT hideInputPanelRequested();
}
bool InternalInputMethodContext::isInputPanelVisible() const
{
return true;
}
QRectF InternalInputMethodContext::keyboardRect() const
{
return QRectF();
}
QLocale InternalInputMethodContext::locale() const
{
return QLocale();
}
Qt::LayoutDirection InternalInputMethodContext::inputDirection() const
{
return Qt::LayoutDirection();
}
void InternalInputMethodContext::setFocusObject(QObject *object)
{
if (inputMethodAccepted()) {
update(Qt::ImQueryAll);
}
// In QWindow::destory(), the focus window change may not be notified,
// Try to refresh potential missing enable change.
QWindow *window = QGuiApplication::focusWindow();
if (m_focusWindow != window) {
if (m_focusWindow) {
disconnect(m_focusWindow, &QObject::destroyed, this, &InternalInputMethodContext::enabledChanged);
}
m_focusWindow = window;
if (m_focusWindow) {
connect(m_focusWindow, &QObject::destroyed, this, &InternalInputMethodContext::enabledChanged);
}
}
Q_EMIT enabledChanged();
}
// From the InputMethod to our internal window
void InternalInputMethodContext::handlePreeditText(const QString &text, int cursorBegin, int cursorEnd)
{
QObject *focusObject = QGuiApplication::focusObject();
if (!focusObject) {
return;
}
QList<QInputMethodEvent::Attribute> attributes;
if (cursorBegin != -1 || cursorEnd != -1) {
// Current supported cursor shape is just line.
// It means, cursorEnd and cursorBegin are the same.
QInputMethodEvent::Attribute attribute1(QInputMethodEvent::Cursor,
text.length(),
1);
attributes.append(attribute1);
}
// only use single underline style for now
QTextCharFormat format;
format.setFontUnderline(true);
format.setUnderlineStyle(QTextCharFormat::SingleUnderline);
QInputMethodEvent::Attribute attribute2(QInputMethodEvent::TextFormat,
0,
text.length(), format);
attributes.append(attribute2);
QInputMethodEvent event(text, attributes);
QCoreApplication::sendEvent(focusObject, &event);
}
void InternalInputMethodContext::handleCommitString(const QString &text)
{
QObject *focusObject = QGuiApplication::focusObject();
if (!focusObject) {
return;
}
QInputMethodEvent event(QString(), {});
event.setCommitString(text);
QCoreApplication::sendEvent(focusObject, &event);
}
void InternalInputMethodContext::handleDeleteSurroundingText(int deleteBefore, uint deleteAfter)
{
QObject *focusObject = QGuiApplication::focusObject();
if (!focusObject) {
return;
}
// insprired by QtWayland client code
const QString &surrounding = QInputMethod::queryFocusObject(Qt::ImSurroundingText, QVariant()).toString();
const int cursor = QInputMethod::queryFocusObject(Qt::ImCursorPosition, QVariant()).toInt();
const int anchor = QInputMethod::queryFocusObject(Qt::ImAnchorPosition, QVariant()).toInt();
const int selectionStart = qMin(cursor, anchor);
const int selectionEnd = qMax(cursor, anchor);
const int deleteBeforeTrasnslated = selectionStart - indexFromWayland(surrounding, -deleteBefore, selectionStart);
const int deleteAfterTranslated = indexFromWayland(surrounding, deleteAfter, selectionEnd) - selectionEnd;
QInputMethodEvent event(QString(), {});
event.setCommitString(QString(), deleteBeforeTrasnslated, deleteAfterTranslated);
QCoreApplication::sendEvent(focusObject, &event);
}
int InternalInputMethodContext::indexFromWayland(const QString &text, int length, int base)
{
if (length == 0) {
return base;
}
if (length < 0) {
const QByteArray &utf8 = QStringView{text}.left(base).toUtf8();
return QString::fromUtf8(utf8.first(qMax(utf8.size() + length, 0))).size();
} else {
const QByteArray &utf8 = QStringView{text}.mid(base).toUtf8();
return QString::fromUtf8(utf8.first(qMin(length, utf8.size()))).size() + base;
}
}
} //namespace
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