add maxline restriction in single line mode textCtrl. let textctrl will fire wxEVT_TEXT_MAXLEN and not recive the chars when the text length beyond the maxlength

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77819 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/textctrl.h

@@ -110,6 +110,7 @@ public:
     virtual bool IsModified() const wxOVERRIDE;
     virtual bool IsEditable() const wxOVERRIDE;
 
+    virtual void SetMaxLength(unsigned long len) wxOVERRIDE;
     // If the return values from and to are the same, there is no selection.
     virtual void GetSelection(wxTextPos* from, wxTextPos* to) const wxOVERRIDE;
 
@@ -489,6 +490,11 @@ private:
     // last position (only used by GetLastPosition())
     wxTextPos m_posLast;
 
+    // max text line length
+    long m_maxLength;
+    // current text line length
+    long m_textLength;
+
     // selection
     wxTextPos m_selAnchor,
               m_selStart,

src/univ/textctrl.cpp

@@ -747,6 +747,9 @@ bool wxTextCtrl::Create(wxWindow *parent,
     SetInitialSize(size);
 
     m_isEditable = !(style & wxTE_READONLY);
+    m_textLength = value.Length();
+    // if m_maxLength is zero means there is no restriction of max length
+    m_maxLength = 0;
 
     CreateCaret();
     InitInsertionPoint();
@@ -2536,6 +2539,11 @@ void wxTextCtrl::OnSize(wxSizeEvent& event)
     event.Skip();
 }
 
+void wxTextCtrl::SetMaxLength(unsigned long len)
+{
+    m_maxLength = len;
+}
+
 wxCoord wxTextCtrl::GetTotalWidth() const
 {
     wxCoord w;
@@ -4533,8 +4541,30 @@ bool wxTextCtrl::PerformAction(const wxControlAction& actionOrig,
     {
         if ( IsEditable() && !strArg.empty() )
         {
-            // inserting text can be undone
-            command = new wxTextCtrlInsertCommand(strArg);
+            if ( IsSingleLine() )
+            {
+                // it is ugly, but we don't want calculate text length every time
+                // in multiline text ctrl.
+                m_textLength += strArg.Length();
+
+                if ( m_maxLength > 0 && m_textLength > m_maxLength )
+                {
+                    wxCommandEvent event(wxEVT_TEXT_MAXLEN, m_windowId);
+                    InitCommandEvent(event);
+                    GetEventHandler()->ProcessEvent(event);
+                    // if m_textLength bigger than m_maxLength. it means not allow
+                    // to insert new chars.
+                }
+                else
+                {
+                    // inserting text can be undone, same as below
+                    command = new wxTextCtrlInsertCommand(strArg);
+                }
+            }
+            else
+            {
+                command = new wxTextCtrlInsertCommand(strArg);
+            }
         }
     }
     else if ( (action == wxACTION_TEXT_PAGE_UP) ||
@@ -4714,7 +4744,7 @@ bool wxTextCtrl::PerformAction(const wxControlAction& actionOrig,
         // execute and remember it to be able to undo it later
         m_cmdProcessor->Submit(command);
     }
-    else if ( IsEditable() )
+    else if ( IsEditable() && ( m_maxLength > 0 && m_textLength <= m_maxLength) )
     {
         wxCommandEvent event(wxEVT_TEXT, GetId());
         InitCommandEvent(event);

tests/controls/textctrltest.cpp

@@ -223,6 +223,7 @@ void TextCtrlTestCase::MaxLength()
     EventCounter maxlen(m_text, wxEVT_TEXT_MAXLEN);
 
     m_text->SetFocus();
+    wxYield();
     m_text->SetMaxLength(10);
 
     wxUIActionSimulator sim;