Allow updating wxBusyInfo text while it's shown

Add UpdateText() and UpdateLabel() updating the text (i.e. possibly
containing markup) or the label (just plain text) shown in the window.

Closes #14743.

Closes https://github.com/Kvaz1r/wxWidgets.git BusyInfoUpdateText14743

include/wx/generic/busyinfo.h

@@ -17,6 +17,7 @@
 
 class WXDLLIMPEXP_FWD_CORE wxFrame;
 class WXDLLIMPEXP_FWD_CORE wxWindow;
+class WXDLLIMPEXP_FWD_CORE wxControl;
 
 //--------------------------------------------------------------------------------
 // wxBusyInfo
@@ -37,12 +38,16 @@ public:
         Init(wxBusyInfoFlags().Parent(parent).Label(message));
     }
 
+    void UpdateText(const wxString& str);
+    void UpdateLabel(const wxString& str);
+
     virtual ~wxBusyInfo();
 
 private:
     void Init(const wxBusyInfoFlags& flags);
 
     wxFrame *m_InfoFrame;
+    wxControl *m_text;
 
     wxDECLARE_NO_COPY_CLASS(wxBusyInfo);
 };

interface/wx/busyinfo.h

@@ -111,6 +111,23 @@ public:
     */
     wxBusyInfo(const wxString& msg, wxWindow* parent = NULL);
 
+    /**
+        Update the information text.
+
+        The @a text string may contain markup as described in
+        wxControl::SetLabelMarkup().
+
+        @since 3.1.3
+    */
+    void UpdateText(const wxString& str);
+
+    /**
+        Same as UpdateText() but doesn't interpret the string as containing markup.
+
+        @since 3.1.3
+    */
+    void UpdateLabel(const wxString& str);
+
     /**
         Hides and closes the window containing the information text.
     */

src/generic/busyinfo.cpp

@@ -79,24 +79,21 @@ void wxBusyInfo::Init(const wxBusyInfoFlags& flags)
     // Vertically center the text in the window.
     sizer->AddStretchSpacer();
 
-    wxControl* text;
 #if wxUSE_MARKUP
+    m_text = new wxStaticTextWithMarkupSupport(panel, wxID_ANY, wxString(),
+                                               wxDefaultPosition,
+                                               wxDefaultSize,
+                                               wxALIGN_CENTRE);
     if ( !flags.m_text.empty() )
-    {
+        m_text->SetLabelMarkup(flags.m_text);
-        text = new wxStaticTextWithMarkupSupport(panel, wxID_ANY, wxString(),
-                                                 wxDefaultPosition,
-                                                 wxDefaultSize,
-                                                 wxALIGN_CENTRE);
-        text->SetLabelMarkup(flags.m_text);
-    }
     else
+        m_text->SetLabelText(flags.m_label);
+#else
+    m_text = new wxStaticText(panel, wxID_ANY, wxString());
+    m_text->SetLabelText(flags.m_label);
 #endif // wxUSE_MARKUP
-    {
-        text = new wxStaticText(panel, wxID_ANY, wxString());
-        text->SetLabelText(flags.m_label);
-    }
 
-    sizer->Add(text, wxSizerFlags().DoubleBorder().Centre());
+    sizer->Add(m_text, wxSizerFlags().DoubleBorder().Centre());
 
     sizer->AddStretchSpacer();
 
@@ -106,7 +103,7 @@ void wxBusyInfo::Init(const wxBusyInfoFlags& flags)
     {
         if ( title )
             title->SetForegroundColour(flags.m_foreground);
-        text->SetForegroundColour(flags.m_foreground);
+        m_text->SetForegroundColour(flags.m_foreground);
     }
 
     if ( flags.m_background.IsOk() )
@@ -131,6 +128,16 @@ void wxBusyInfo::Init(const wxBusyInfoFlags& flags)
     m_InfoFrame->Update();
 }
 
+void wxBusyInfo::UpdateText(const wxString& str)
+{
+    m_text->SetLabelMarkup(str);
+}
+
+void wxBusyInfo::UpdateLabel(const wxString& str)
+{
+    m_text->SetLabelText(str);
+}
+
 wxBusyInfo::~wxBusyInfo()
 {
     m_InfoFrame->Show(false);