check whether the string is non-empty before accessing its first element

[wxWidgets.git] / src / common / cshelp.cpp

diff --git a/src/common/cshelp.cpp b/src/common/cshelp.cpp
index c9a033d8a6e26e0fd290582b6cd09ec2c92e7364..c24b709e988037a0eb7d60410fff47c05baa0d11 100644 (file)
--- a/src/common/cshelp.cpp
+++ b/src/common/cshelp.cpp
@@ -6,17 +6,13 @@
 // Created:     08/09/2000
 // RCS-ID:      $Id$
 // Copyright:   (c) 2000 Julian Smart, Vadim Zeitlin
 // Created:     08/09/2000
 // RCS-ID:      $Id$
 // Copyright:   (c) 2000 Julian Smart, Vadim Zeitlin

-// Licence:    wxWindows licence
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
 // declarations
 // ============================================================================
 
 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
 // declarations
 // ============================================================================
 

-#ifdef __GNUG__
-    #pragma implementation "cshelp.h"
-#endif
-

 // ----------------------------------------------------------------------------
 // headers
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // headers
 // ----------------------------------------------------------------------------


@@ -31,16 +27,18 @@
 #if wxUSE_HELP
 
 #ifndef WX_PRECOMP
 #if wxUSE_HELP
 
 #ifndef WX_PRECOMP

-    // FIXME: temporary needed for wxSimpleHelpProvider compilation, to be
-    //        removed later
-    #include "wx/intl.h"
-    #include "wx/msgdlg.h"
+    #include "wx/app.h"
+    #include "wx/module.h"

 #endif
 
 #endif
 

-#include "wx/app.h"
-
+#include "wx/tipwin.h"

 #include "wx/cshelp.h"
 
 #include "wx/cshelp.h"
 

+#if wxUSE_MS_HTML_HELP
+    #include "wx/msw/helpchm.h"     // for ShowContextHelpPopup
+    #include "wx/utils.h"           // for wxGetMousePosition()
+#endif
+

 // ----------------------------------------------------------------------------
 // wxContextHelpEvtHandler private class
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // wxContextHelpEvtHandler private class
 // ----------------------------------------------------------------------------


@@ -59,6 +57,8 @@ public:
 
 //// Data
     wxContextHelp* m_contextHelp;
 
 //// Data
     wxContextHelp* m_contextHelp;

+
+    DECLARE_NO_COPY_CLASS(wxContextHelpEvtHandler)

 };
 
 // ============================================================================
 };
 
 // ============================================================================


@@ -78,7 +78,7 @@ IMPLEMENT_DYNAMIC_CLASS(wxContextHelp, wxObject)
 
 wxContextHelp::wxContextHelp(wxWindow* win, bool beginHelp)
 {
 
 wxContextHelp::wxContextHelp(wxWindow* win, bool beginHelp)
 {

-    m_inHelp = FALSE;
+    m_inHelp = false;

 
     if (beginHelp)
         BeginContextHelp(win);
 
     if (beginHelp)
         BeginContextHelp(win);


@@ -90,13 +90,34 @@ wxContextHelp::~wxContextHelp()
         EndContextHelp();
 }
 
         EndContextHelp();
 }
 

+// Not currently needed, but on some systems capture may not work as
+// expected so we'll leave it here for now.
+#ifdef __WXMOTIF__
+static void wxPushOrPopEventHandlers(wxContextHelp* help, wxWindow* win, bool push)
+{
+    if (push)
+        win->PushEventHandler(new wxContextHelpEvtHandler(help));
+    else
+        win->PopEventHandler(true);
+
+    wxWindowList::compatibility_iterator node = win->GetChildren().GetFirst();
+    while (node)
+    {
+        wxWindow* child = node->GetData();
+        wxPushOrPopEventHandlers(help, child, push);
+
+        node = node->GetNext();
+    }
+}
+#endif
+

 // Begin 'context help mode'
 bool wxContextHelp::BeginContextHelp(wxWindow* win)
 {
     if (!win)
         win = wxTheApp->GetTopWindow();
     if (!win)
 // Begin 'context help mode'
 bool wxContextHelp::BeginContextHelp(wxWindow* win)
 {
     if (!win)
         win = wxTheApp->GetTopWindow();
     if (!win)

-        return FALSE;
+        return false;

 
     wxCursor cursor(wxCURSOR_QUESTION_ARROW);
     wxCursor oldCursor = win->GetCursor();
 
     wxCursor cursor(wxCURSOR_QUESTION_ARROW);
     wxCursor oldCursor = win->GetCursor();


@@ -106,7 +127,13 @@ bool wxContextHelp::BeginContextHelp(wxWindow* win)
     //    wxSetCursor(cursor);
 #endif
 
     //    wxSetCursor(cursor);
 #endif
 

+    m_status = false;
+
+#ifdef __WXMOTIF__
+    wxPushOrPopEventHandlers(this, win, true);
+#else

     win->PushEventHandler(new wxContextHelpEvtHandler(this));
     win->PushEventHandler(new wxContextHelpEvtHandler(this));

+#endif

 
     win->CaptureMouse();
 
 
     win->CaptureMouse();
 


@@ -114,7 +141,11 @@ bool wxContextHelp::BeginContextHelp(wxWindow* win)
 
     win->ReleaseMouse();
 
 
     win->ReleaseMouse();
 

-    win->PopEventHandler(TRUE);
+#ifdef __WXMOTIF__
+    wxPushOrPopEventHandlers(this, win, false);
+#else
+    win->PopEventHandler(true);
+#endif

 
     win->SetCursor(oldCursor);
 
 
     win->SetCursor(oldCursor);
 


@@ -122,23 +153,33 @@ bool wxContextHelp::BeginContextHelp(wxWindow* win)
     {
         wxPoint pt;
         wxWindow* winAtPtr = wxFindWindowAtPointer(pt);
     {
         wxPoint pt;
         wxWindow* winAtPtr = wxFindWindowAtPointer(pt);

+
+#if 0
+        if (winAtPtr)
+        {
+            printf("Picked %s (%d)\n", winAtPtr->GetName().c_str(),
+                   winAtPtr->GetId());
+        }
+#endif
+

         if (winAtPtr)
             DispatchEvent(winAtPtr, pt);
     }
 
         if (winAtPtr)
             DispatchEvent(winAtPtr, pt);
     }
 

-    return TRUE;
+    return true;

 }
 
 bool wxContextHelp::EndContextHelp()
 {
 }
 
 bool wxContextHelp::EndContextHelp()
 {

-    m_inHelp = FALSE;
+    m_inHelp = false;

 
 

-    return TRUE;
+    return true;

 }
 
 bool wxContextHelp::EventLoop()
 {
 }
 
 bool wxContextHelp::EventLoop()
 {

-    m_inHelp = TRUE;
+    m_inHelp = true;
+

     while ( m_inHelp )
     {
         if (wxTheApp->Pending())
     while ( m_inHelp )
     {
         if (wxTheApp->Pending())


@@ -150,60 +191,50 @@ bool wxContextHelp::EventLoop()
             wxTheApp->ProcessIdle();
         }
     }
             wxTheApp->ProcessIdle();
         }
     }

-    return TRUE;
+
+    return true;

 }
 
 bool wxContextHelpEvtHandler::ProcessEvent(wxEvent& event)
 {
 }
 
 bool wxContextHelpEvtHandler::ProcessEvent(wxEvent& event)
 {

-    switch (event.GetEventType())
+    if (event.GetEventType() == wxEVT_LEFT_DOWN)

     {
     {

-        case wxEVT_LEFT_DOWN:
-        {
-         //wxMouseEvent& mouseEvent = (wxMouseEvent&) event;
-            m_contextHelp->SetStatus(TRUE);
-            m_contextHelp->EndContextHelp();
-            return TRUE;
-            break;
-        }
-        case wxEVT_CHAR:
-        case wxEVT_KEY_DOWN:
-        case wxEVT_ACTIVATE:
-        case wxEVT_MOUSE_CAPTURE_CHANGED:
-        {
-            m_contextHelp->SetStatus(FALSE);
-            m_contextHelp->EndContextHelp();
-            return TRUE;
-            break;
-        }
-        case wxEVT_PAINT:
-        case wxEVT_ERASE_BACKGROUND:
-        {
-            event.Skip();
-            return FALSE;
-            break;
-        }
+        m_contextHelp->SetStatus(true);
+        m_contextHelp->EndContextHelp();
+        return true;

     }
 
     }
 

-    return TRUE;
+    if ((event.GetEventType() == wxEVT_CHAR) ||
+        (event.GetEventType() == wxEVT_KEY_DOWN) ||
+        (event.GetEventType() == wxEVT_ACTIVATE) ||
+        (event.GetEventType() == wxEVT_MOUSE_CAPTURE_CHANGED))
+    {
+        // May have already been set to true by a left-click
+        //m_contextHelp->SetStatus(false);
+        m_contextHelp->EndContextHelp();
+        return true;
+    }
+
+    if ((event.GetEventType() == wxEVT_PAINT) ||
+        (event.GetEventType() == wxEVT_ERASE_BACKGROUND))
+    {
+        event.Skip();
+        return false;
+    }
+
+    return true;

 }
 
 // Dispatch the help event to the relevant window
 bool wxContextHelp::DispatchEvent(wxWindow* win, const wxPoint& pt)
 {
 }
 
 // Dispatch the help event to the relevant window
 bool wxContextHelp::DispatchEvent(wxWindow* win, const wxPoint& pt)
 {

-    wxWindow* subjectOfHelp = win;
-    bool eventProcessed = FALSE;
-    while (subjectOfHelp && !eventProcessed)
-    {
-        wxHelpEvent helpEvent(wxEVT_HELP, subjectOfHelp->GetId(), pt) ;
-        helpEvent.SetEventObject(this);
-        eventProcessed = win->GetEventHandler()->ProcessEvent(helpEvent);
-        
-        // Go up the window hierarchy until the event is handled (or not).
-        // I.e. keep submitting ancestor windows until one is recognised
-        // by the app code that processes the ids and displays help.
-        subjectOfHelp = subjectOfHelp->GetParent();
-    }
-    return eventProcessed;
+    wxCHECK_MSG( win, false, _T("win parameter can't be NULL") );
+
+    wxHelpEvent helpEvent(wxEVT_HELP, win->GetId(), pt,
+                          wxHelpEvent::Origin_HelpButton);
+    helpEvent.SetEventObject(win);
+
+    return win->GetEventHandler()->ProcessEvent(helpEvent);

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -216,8 +247,9 @@ bool wxContextHelp::DispatchEvent(wxWindow* win, const wxPoint& pt)
  * to put the application into context help mode.
  */
 
  * to put the application into context help mode.
  */
 

-#if !defined(__WXMSW__)
-static char * csquery_xpm[] = {
+#ifndef __WXPM__
+
+static const char * csquery_xpm[] = {

 "12 11 2 1",
 "  c None",
 ". c #000000",
 "12 11 2 1",
 "  c None",
 ". c #000000",


@@ -232,6 +264,7 @@ static char * csquery_xpm[] = {
 "     ..     ",
 "     ..     ",
 "            "};
 "     ..     ",
 "     ..     ",
 "            "};

+

 #endif
 
 IMPLEMENT_CLASS(wxContextHelpButton, wxBitmapButton)
 #endif
 
 IMPLEMENT_CLASS(wxContextHelpButton, wxBitmapButton)


@@ -245,12 +278,19 @@ wxContextHelpButton::wxContextHelpButton(wxWindow* parent,
                                          const wxPoint& pos,
                                          const wxSize& size,
                                          long style)
                                          const wxPoint& pos,
                                          const wxSize& size,
                                          long style)

-                   : wxBitmapButton(parent, id, wxBITMAP(csquery),
+#if defined(__WXPM__)
+                   : wxBitmapButton(parent, id, wxBitmap(wxCSQUERY_BITMAP
+                                                         ,wxBITMAP_TYPE_RESOURCE
+                                                        ),
+                                    pos, size, style)
+#else
+                   : wxBitmapButton(parent, id, wxBitmap(csquery_xpm),

                                     pos, size, style)
                                     pos, size, style)

+#endif

 {
 }
 
 {
 }
 

-void wxContextHelpButton::OnContextHelp(wxCommandEvent& event)
+void wxContextHelpButton::OnContextHelp(wxCommandEvent& WXUNUSED(event))

 {
     wxContextHelp contextHelp(GetParent());
 }
 {
     wxContextHelp contextHelp(GetParent());
 }


@@ -274,46 +314,190 @@ void wxHelpProvider::AddHelp(wxWindowID WXUNUSED(id),
 {
 }
 
 {
 }
 

+// removes the association
+void wxHelpProvider::RemoveHelp(wxWindowBase* WXUNUSED(window))
+{
+}
+

 wxHelpProvider::~wxHelpProvider()
 {
 }
 
 wxHelpProvider::~wxHelpProvider()
 {
 }
 

+wxString wxHelpProvider::GetHelpTextMaybeAtPoint(wxWindowBase *window)
+{
+    if ( m_helptextAtPoint != wxDefaultPosition ||
+            m_helptextOrigin != wxHelpEvent::Origin_Unknown )
+    {
+        wxCHECK_MSG( window, wxEmptyString, _T("window must not be NULL") );
+
+        wxPoint pt = m_helptextAtPoint;
+        wxHelpEvent::Origin origin = m_helptextOrigin;
+
+        m_helptextAtPoint = wxDefaultPosition;
+        m_helptextOrigin = wxHelpEvent::Origin_Unknown;
+
+        return window->GetHelpTextAtPoint(pt, origin);
+    }
+
+    return GetHelp(window);
+}
+

 // ----------------------------------------------------------------------------
 // wxSimpleHelpProvider
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 // wxSimpleHelpProvider
 // ----------------------------------------------------------------------------
 

+#define WINHASH_KEY(w) wxPtrToUInt(w)
+

 wxString wxSimpleHelpProvider::GetHelp(const wxWindowBase *window)
 {
 wxString wxSimpleHelpProvider::GetHelp(const wxWindowBase *window)
 {

-    bool wasFound;
-    wxString text = m_hashWindows.Get((long)window, &wasFound);
-    if ( !wasFound )
-        text = m_hashIds.Get(window->GetId());
+    wxSimpleHelpProviderHashMap::iterator it = m_hashWindows.find(WINHASH_KEY(window));

 
 

-    return text;
+    if ( it == m_hashWindows.end() )
+    {
+        it = m_hashIds.find(window->GetId());
+        if ( it == m_hashIds.end() )
+            return wxEmptyString;
+    }
+
+    return it->second;

 }
 
 void wxSimpleHelpProvider::AddHelp(wxWindowBase *window, const wxString& text)
 {
 }
 
 void wxSimpleHelpProvider::AddHelp(wxWindowBase *window, const wxString& text)
 {

-    m_hashWindows.Put((long)window, text);
+    m_hashWindows.erase(WINHASH_KEY(window));
+    m_hashWindows[WINHASH_KEY(window)] = text;

 }
 
 void wxSimpleHelpProvider::AddHelp(wxWindowID id, const wxString& text)
 {
 }
 
 void wxSimpleHelpProvider::AddHelp(wxWindowID id, const wxString& text)
 {

-    m_hashIds.Put(id, text);
+    wxSimpleHelpProviderHashMap::key_type key = (wxSimpleHelpProviderHashMap::key_type)id;
+    m_hashIds.erase(key);
+    m_hashIds[key] = text;
+}
+
+// removes the association
+void wxSimpleHelpProvider::RemoveHelp(wxWindowBase* window)
+{
+    m_hashWindows.erase(WINHASH_KEY(window));

 }
 
 bool wxSimpleHelpProvider::ShowHelp(wxWindowBase *window)
 {
 }
 
 bool wxSimpleHelpProvider::ShowHelp(wxWindowBase *window)
 {

-    wxString text = GetHelp(window);
+#if wxUSE_MS_HTML_HELP || wxUSE_TIPWINDOW
+    const wxString text = GetHelpTextMaybeAtPoint(window);
+

     if ( !text.empty() )
     {
     if ( !text.empty() )
     {

-        wxMessageBox(text, _("Help"), wxICON_INFORMATION | wxOK,
-                     (wxWindow *)window);
+        // use the native help popup style if it's available
+#if wxUSE_MS_HTML_HELP
+        if ( !wxCHMHelpController::ShowContextHelpPopup
+                                   (
+                                        text,
+                                        wxGetMousePosition(),
+                                        (wxWindow *)window
+                                   ) )
+#endif // wxUSE_MS_HTML_HELP
+        {
+#if wxUSE_TIPWINDOW
+            static wxTipWindow* s_tipWindow = NULL;
+
+            if ( s_tipWindow )
+            {
+                // Prevent s_tipWindow being nulled in OnIdle, thereby removing
+                // the chance for the window to be closed by ShowHelp
+                s_tipWindow->SetTipWindowPtr(NULL);
+                s_tipWindow->Close();
+            }
+
+            s_tipWindow = new wxTipWindow((wxWindow *)window, text,
+                                            100, &s_tipWindow);
+#else // !wxUSE_TIPWINDOW
+            // we tried wxCHMHelpController but it failed and we don't have
+            // wxTipWindow to fall back on, so
+            return false;
+#endif // wxUSE_TIPWINDOW
+        }

 
 

-        return TRUE;
+        return true;

     }
     }

+#else // !wxUSE_MS_HTML_HELP && !wxUSE_TIPWINDOW
+    wxUnusedVar(window);
+#endif // wxUSE_MS_HTML_HELP || wxUSE_TIPWINDOW
+
+    return false;
+}
+
+// ----------------------------------------------------------------------------
+// wxHelpControllerHelpProvider
+// ----------------------------------------------------------------------------
+
+wxHelpControllerHelpProvider::wxHelpControllerHelpProvider(wxHelpControllerBase* hc)
+{
+    m_helpController = hc;
+}
+
+bool wxHelpControllerHelpProvider::ShowHelp(wxWindowBase *window)
+{
+    const wxString text = GetHelpTextMaybeAtPoint(window);

 
 

-    return FALSE;
+    if ( text.empty() )
+        return false;
+
+    if ( m_helpController )
+    {
+        // if it's a numeric topic, show it
+        long topic;
+        if ( text.ToLong(&topic) )
+            return m_helpController->DisplayContextPopup(topic);
+
+        // otherwise show the text directly
+        if ( m_helpController->DisplayTextPopup(text, wxGetMousePosition()) )
+            return true;
+    }
+
+    // if there is no help controller or it's not capable of showing the help,
+    // fallback to the default method
+    return wxSimpleHelpProvider::ShowHelp(window);
+}
+
+// Convenience function for turning context id into wxString
+wxString wxContextId(int id)
+{
+    return wxString::Format(_T("%d"), id);
+}
+
+// ----------------------------------------------------------------------------
+// wxHelpProviderModule: module responsible for cleaning up help provider.
+// ----------------------------------------------------------------------------
+
+class wxHelpProviderModule : public wxModule
+{
+public:
+    bool OnInit();
+    void OnExit();
+
+private:
+    DECLARE_DYNAMIC_CLASS(wxHelpProviderModule)
+};
+
+IMPLEMENT_DYNAMIC_CLASS(wxHelpProviderModule, wxModule)
+
+bool wxHelpProviderModule::OnInit()
+{
+    // Probably we don't want to do anything by default,
+    // since it could pull in extra code
+    // wxHelpProvider::Set(new wxSimpleHelpProvider);
+
+    return true;
+}
+
+void wxHelpProviderModule::OnExit()
+{
+    if (wxHelpProvider::Get())
+    {
+        delete wxHelpProvider::Get();
+        wxHelpProvider::Set(NULL);
+    }

 }
 
 #endif // wxUSE_HELP
 }
 
 #endif // wxUSE_HELP