diff options
| -rw-r--r-- | src/gui/accessible/qaccessible_win.cpp | 126 |
1 files changed, 113 insertions, 13 deletions
diff --git a/src/gui/accessible/qaccessible_win.cpp b/src/gui/accessible/qaccessible_win.cpp index caa21043d8..0e69a5eea1 100644 --- a/src/gui/accessible/qaccessible_win.cpp +++ b/src/gui/accessible/qaccessible_win.cpp @@ -47,6 +47,8 @@ #include "qt_windows.h" #include "qwidget.h" #include "qsettings.h" +#include <QtCore/qmap.h> +#include <QtCore/qpair.h> #include <winuser.h> #if !defined(WINABLEAPI) @@ -159,6 +161,12 @@ void showDebug(const char* funcName, const QAccessibleInterface *iface) # define showDebug(f, iface) #endif +// This stuff is used for widgets/items with no window handle: +typedef QMap<int, QPair<QObject*,int> > NotifyMap; +Q_GLOBAL_STATIC(NotifyMap, qAccessibleRecentSentEvents) +static int eventNum = 0; + + void QAccessible::initialize() { @@ -251,17 +259,15 @@ void QAccessible::updateAccessibility(QObject *o, int who, Event reason) // An event has to be associated with a window, // so find the first parent that is a widget. QWidget *w = 0; - if (o->isWidgetType()) { - w = (QWidget*)o; - } else { - QObject *p = o; - while ((p = p->parent()) != 0) { - if (p->isWidgetType()) { - w = (QWidget*)p; + QObject *p = o; + do { + if (p->isWidgetType()) { + w = static_cast<QWidget*>(p); + if (w->internalWinId()) break; - } } - } + p = p->parent(); + } while (p); if (!w) { if (reason != QAccessible::ContextHelpStart && @@ -282,12 +288,81 @@ void QAccessible::updateAccessibility(QObject *o, int who, Event reason) } } + WId wid = w->internalWinId(); if (reason != MenuCommand) { // MenuCommand is faked - ptrNotifyWinEvent(reason, w->winId(), OBJID_CLIENT, who); + if (w != o) { + // See comment "SENDING EVENTS TO OBJECTS WITH NO WINDOW HANDLE" + eventNum %= 50; //[0..49] + int eventId = - eventNum - 1; + + qAccessibleRecentSentEvents()->insert(eventId, qMakePair(o,who)); + ptrNotifyWinEvent(reason, wid, OBJID_CLIENT, eventId ); + + ++eventNum; + } else { + ptrNotifyWinEvent(reason, wid, OBJID_CLIENT, who); + } } #endif // Q_WS_WINCE } +/* == SENDING EVENTS TO OBJECTS WITH NO WINDOW HANDLE == + + If the user requested to send the event to a widget with no window, + we need to send an event to an object with no hwnd. + The way we do that is to send it to the *first* ancestor widget + with a window. + Then we'll need a way of identifying the child: + We'll just keep a list of the most recent events that we have sent, + where each entry in the list is identified by a negative value + between [-50,-1]. This negative value we will pass on to + NotifyWinEvent() as the child id. When the negative value have + reached -50, it will wrap around to -1. This seems to be enough + + Now, when the client receives that event, he will first call + AccessibleObjectFromEvent() where dwChildID is the special + negative value. AccessibleObjectFromEvent does two steps: + 1. It will first sent a WM_GETOBJECT to the server, asking + for the IAccessible interface for the HWND. + 2. With the IAccessible interface it got hold of it will call + acc_getChild where the child id argument is the special + negative identifier. In our reimplementation of get_accChild + we check for this if the child id is negative. If it is, then + we'll look up in our table for the entry that is associated + with that value. + The entry will then contain a pointer to the QObject /QWidget + that we can use to call queryAccessibleInterface() on. + + + The following figure shows how the interaction between server and + client is in the case when the server is sending an event. + +SERVER (Qt) | CLIENT | +--------------------------------------------+---------------------------------------+ + | +acc->updateAccessibility(obj, childIndex) | + | +recentEvents()->insert(- 1 - eventNum, | + qMakePair(obj, childIndex) | +NotifyWinEvent(hwnd, childId) => | + | AccessibleObjectFromEvent(event, hwnd, OBJID_CLIENT, childId ) + | will do: + <=== 1. send WM_GETOBJECT(hwnd, OBJID_CLIENT) +widget ~= hwnd +iface = queryAccessibleInteface(widget) +(create IAccessible interface wrapper for + iface) + return iface ===> IAccessible* iface; (for hwnd) + | + <=== call iface->get_accChild(childId) +get_accChild() { | + if (varChildID.lVal < 0) { + QPair ref = recentEvents().value(varChildID.lVal); + [...] + } +*/ + + void QAccessible::setRootObject(QObject *o) { if (rootObjectHandler) { @@ -418,15 +493,18 @@ public: delete accessible; } + /* IUnknown */ HRESULT STDMETHODCALLTYPE QueryInterface(REFIID, LPVOID *); ULONG STDMETHODCALLTYPE AddRef(); ULONG STDMETHODCALLTYPE Release(); + /* IDispatch */ HRESULT STDMETHODCALLTYPE GetTypeInfoCount(unsigned int *); HRESULT STDMETHODCALLTYPE GetTypeInfo(unsigned int, unsigned long, ITypeInfo **); HRESULT STDMETHODCALLTYPE GetIDsOfNames(const _GUID &, wchar_t **, unsigned int, unsigned long, long *); HRESULT STDMETHODCALLTYPE Invoke(long, const _GUID &, unsigned long, unsigned short, tagDISPPARAMS *, tagVARIANT *, tagEXCEPINFO *, unsigned int *); + /* IAccessible */ HRESULT STDMETHODCALLTYPE accHitTest(long xLeft, long yTop, VARIANT *pvarID); HRESULT STDMETHODCALLTYPE accLocation(long *pxLeft, long *pyTop, long *pcxWidth, long *pcyHeight, VARIANT varID); HRESULT STDMETHODCALLTYPE accNavigate(long navDir, VARIANT varStart, VARIANT *pvarEnd); @@ -451,6 +529,7 @@ public: HRESULT STDMETHODCALLTYPE get_accFocus(VARIANT *pvarID); HRESULT STDMETHODCALLTYPE get_accSelection(VARIANT *pvarChildren); + /* IOleWindow */ HRESULT STDMETHODCALLTYPE GetWindow(HWND *phwnd); HRESULT STDMETHODCALLTYPE ContextSensitiveHelp(BOOL fEnterMode); @@ -896,9 +975,30 @@ HRESULT STDMETHODCALLTYPE QWindowsAccessible::get_accChild(VARIANT varChildID, I if (varChildID.vt == VT_EMPTY) return E_INVALIDARG; + + int childIndex = varChildID.lVal; QAccessibleInterface *acc = 0; - RelationFlag rel = varChildID.lVal ? Child : Self; - accessible->navigate(rel, varChildID.lVal, &acc); + + if (childIndex < 0) { + const int entry = childIndex; + QPair<QObject*, int> ref = qAccessibleRecentSentEvents()->value(entry); + if (ref.first) { + acc = queryAccessibleInterface(ref.first); + if (acc && ref.second) { + if (ref.second) { + QAccessibleInterface *res; + int index = acc->navigate(Child, ref.second, &res); + delete acc; + if (index == -1) + return E_INVALIDARG; + acc = res; + } + } + } + } else { + RelationFlag rel = childIndex ? Child : Self; + accessible->navigate(rel, childIndex, &acc); + } if (acc) { QWindowsAccessible* wacc = new QWindowsAccessible(acc); @@ -1203,7 +1303,7 @@ HRESULT STDMETHODCALLTYPE QWindowsAccessible::GetWindow(HWND *phwnd) if (!o || !o->isWidgetType()) return E_FAIL; - *phwnd = static_cast<QWidget*>(o)->winId(); + *phwnd = static_cast<QWidget*>(o)->effectiveWinId(); return S_OK; } |