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Implement focus change for Windows Input context.

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Keep track of the focus object in the input context ensuring
that events on canceling are sent to the right object.

Task-number: QTBUG-40402
Change-Id: I79820db94d97e21b47abc8fe2bae6fa012d31236
Reviewed-by: Liang Qi <liang.qi@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
This commit is contained in:
Friedemann Kleint 2014-07-30 15:13:41 +02:00
parent 219c2eb4e2
commit 501fe9f939
2 changed files with 33 additions and 19 deletions
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47
src/plugins/platforms/windows/qwindowsinputcontext.cpp
View File

@ -83,6 +83,10 @@ static inline QByteArray debugComposition(int lParam)
// Cancel current IME composition.
static inline void imeNotifyCancelComposition(HWND hwnd)
{
if (!hwnd) {
qWarning() << __FUNCTION__ << "called with" << hwnd;
return;
}
const HIMC himc = ImmGetContext(hwnd);
ImmNotifyIME(himc, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
ImmReleaseContext(hwnd, himc);
@ -175,21 +179,27 @@ void QWindowsInputContext::reset()
QPlatformInputContext::reset();
if (!m_compositionContext.hwnd)
return;
QObject *fo = qApp->focusObject();
qCDebug(lcQpaInputMethods) << __FUNCTION__<< fo;
if (!fo)
return;
if (m_compositionContext.isComposing) {
qCDebug(lcQpaInputMethods) << __FUNCTION__;
if (m_compositionContext.isComposing && m_compositionContext.focusObject.isNull()) {
QInputMethodEvent event;
if (!m_compositionContext.composition.isEmpty())
event.setCommitString(m_compositionContext.composition);
QCoreApplication::sendEvent(fo, &event);
QCoreApplication::sendEvent(m_compositionContext.focusObject, &event);
endContextComposition();
}
imeNotifyCancelComposition(m_compositionContext.hwnd);
doneContext();
}
void QWindowsInputContext::setFocusObject(QObject *)
{
// ### fixme: On Windows 8.1, it has been observed that the Input context
// remains active when this happens resulting in a lock-up. Consecutive
// key events still have VK_PROCESSKEY set and are thus ignored.
if (m_compositionContext.isComposing)
imeNotifyCancelComposition(m_compositionContext.hwnd);
}
/*!
\brief Moves the candidate window along with microfocus of the focus object.
*/
@ -317,7 +327,7 @@ static inline QTextFormat standardFormat(StandardFormat format)
bool QWindowsInputContext::startComposition(HWND hwnd)
{
const QObject *fo = qApp->focusObject();
QObject *fo = QGuiApplication::focusObject();
if (!fo)
return false;
// This should always match the object.
@ -327,7 +337,7 @@ bool QWindowsInputContext::startComposition(HWND hwnd)
qCDebug(lcQpaInputMethods) << __FUNCTION__ << fo << window;
if (!fo || QWindowsWindow::handleOf(window) != hwnd)
return false;
initContext(hwnd);
initContext(hwnd, fo);
startContextComposition();
return true;
}
@ -341,6 +351,7 @@ void QWindowsInputContext::startContextComposition()
m_compositionContext.isComposing = true;
m_compositionContext.composition.clear();
m_compositionContext.position = 0;
cursorRectChanged(); // position cursor initially.
update(Qt::ImQueryAll);
}
@ -384,11 +395,10 @@ static inline QList<QInputMethodEvent::Attribute>
bool QWindowsInputContext::composition(HWND hwnd, LPARAM lParamIn)
{
QObject *fo = qApp->focusObject();
const int lParam = int(lParamIn);
qCDebug(lcQpaInputMethods) << '>' << __FUNCTION__ << fo << debugComposition(lParam)
<< " composing=" << m_compositionContext.isComposing;
if (!fo || m_compositionContext.hwnd != hwnd || !lParam)
qCDebug(lcQpaInputMethods) << '>' << __FUNCTION__ << m_compositionContext.focusObject
<< debugComposition(lParam) << " composing=" << m_compositionContext.isComposing;
if (m_compositionContext.focusObject.isNull() || m_compositionContext.hwnd != hwnd || !lParam)
return false;
const HIMC himc = ImmGetContext(m_compositionContext.hwnd);
if (!himc)
@ -425,10 +435,10 @@ bool QWindowsInputContext::composition(HWND hwnd, LPARAM lParamIn)
event->setCommitString(getCompositionString(himc, GCS_RESULTSTR));
endContextComposition();
}
const bool result = QCoreApplication::sendEvent(fo, event.data());
const bool result = QCoreApplication::sendEvent(m_compositionContext.focusObject, event.data());
qCDebug(lcQpaInputMethods) << '<' << __FUNCTION__ << "sending markup="
<< event->attributes().size() << " commit=" << event->commitString()
<< " to " << fo << " returns " << result;
<< " to " << m_compositionContext.focusObject << " returns " << result;
update(Qt::ImQueryAll);
ImmReleaseContext(m_compositionContext.hwnd, himc);
return result;
@ -442,8 +452,7 @@ bool QWindowsInputContext::endComposition(HWND hwnd)
// against that.
if (m_endCompositionRecursionGuard || m_compositionContext.hwnd != hwnd)
return false;
QObject *fo = qApp->focusObject();
if (!fo)
if (m_compositionContext.focusObject.isNull())
return false;
m_endCompositionRecursionGuard = true;
@ -451,7 +460,7 @@ bool QWindowsInputContext::endComposition(HWND hwnd)
imeNotifyCancelComposition(m_compositionContext.hwnd);
if (m_compositionContext.isComposing) {
QInputMethodEvent event;
QCoreApplication::sendEvent(fo, &event);
QCoreApplication::sendEvent(m_compositionContext.focusObject, &event);
}
doneContext();
@ -459,11 +468,12 @@ bool QWindowsInputContext::endComposition(HWND hwnd)
return true;
}
void QWindowsInputContext::initContext(HWND hwnd)
void QWindowsInputContext::initContext(HWND hwnd, QObject *focusObject)
{
if (m_compositionContext.hwnd)
doneContext();
m_compositionContext.hwnd = hwnd;
m_compositionContext.focusObject = focusObject;
// Create a hidden caret which is kept at the microfocus
// position in update(). This is important for some
// Chinese input methods.
@ -484,6 +494,7 @@ void QWindowsInputContext::doneContext()
m_compositionContext.composition.clear();
m_compositionContext.position = 0;
m_compositionContext.isComposing = m_compositionContext.haveCaret = false;
m_compositionContext.focusObject = 0;
}
bool QWindowsInputContext::handleIME_Request(WPARAM wParam,

5
src/plugins/platforms/windows/qwindowsinputcontext.h
View File

@ -44,6 +44,7 @@
#include "qtwindows_additional.h"
#include <QtCore/QPointer>
#include <qpa/qplatforminputcontext.h>
QT_BEGIN_NAMESPACE
@ -63,6 +64,7 @@ class QWindowsInputContext : public QPlatformInputContext
QString composition;
int position;
bool isComposing;
QPointer<QObject> focusObject;
};
public:
explicit QWindowsInputContext();
@ -71,6 +73,7 @@ public:
void reset() Q_DECL_OVERRIDE;
void update(Qt::InputMethodQueries) Q_DECL_OVERRIDE;
void invokeAction(QInputMethod::Action, int cursorPosition) Q_DECL_OVERRIDE;
void setFocusObject(QObject *object) Q_DECL_OVERRIDE;
static QWindowsInputContext *instance();
@ -86,7 +89,7 @@ private slots:
void cursorRectChanged();
private:
void initContext(HWND hwnd);
void initContext(HWND hwnd, QObject *focusObject);
void doneContext();
void startContextComposition();
void endContextComposition();