From 28fdd8db44bc6070c71a77af783fb4da0b554d8c Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 8 Oct 2006 17:52:39 +0000
Subject: [PATCH] added wxTextCtrl::IsEmpty()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41740 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/changes.txt          | 1 +
 include/wx/gtk/textctrl.h | 4 ++--
 include/wx/msw/textctrl.h | 3 ++-
 include/wx/textctrl.h     | 2 ++
 src/gtk/textctrl.cpp      | 8 ++++++++
 src/msw/textctrl.cpp      | 9 +++++++++
 6 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/docs/changes.txt b/docs/changes.txt
index 856405f603..8637c9deee 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -69,6 +69,7 @@ All (GUI):
 - Added wxAboutBox() function for displaying the standard about dialog
 - Added wxID_PAGE_SETUP standard id.
 - Added wxSize::IncBy() and DecBy() methods.
+- Added wxTextCtrl::IsEmpty()
 - Added file type parameter to wxTextCtrl::LoadFile, wxTextCtrl::SaveFile for
   consistency with wxRichTextCtrl.
 - wxRichTextCtrl: fixed range out-by-one bug to be consistent with wxTextCtrl API,
diff --git a/include/wx/gtk/textctrl.h b/include/wx/gtk/textctrl.h
index 8cde769c6b..017116609f 100644
--- a/include/wx/gtk/textctrl.h
+++ b/include/wx/gtk/textctrl.h
@@ -43,9 +43,9 @@ public:
     // ----------------------------------
 
     virtual wxString GetValue() const;
+    virtual bool IsEmpty() const;
     virtual void SetValue(const wxString& value) { DoSetValue(value, SetValue_SendEvent); }
-
-    virtual void ChangeValue(const wxString &value) { DoSetValue(value); }
+    virtual void ChangeValue(const wxString& value) { DoSetValue(value); }
 
     virtual int GetLineLength(long lineNo) const;
     virtual wxString GetLineText(long lineNo) const;
diff --git a/include/wx/msw/textctrl.h b/include/wx/msw/textctrl.h
index dee8fd0bbe..8649f1491e 100644
--- a/include/wx/msw/textctrl.h
+++ b/include/wx/msw/textctrl.h
@@ -45,8 +45,9 @@ public:
     // ----------------------------------
 
     virtual wxString GetValue() const;
+    virtual bool IsEmpty() const;
     virtual void SetValue(const wxString& value) { DoSetValue(value, SetValue_SendEvent); }
-    virtual void ChangeValue(const wxString &value) { DoSetValue(value); }
+    virtual void ChangeValue(const wxString& value) { DoSetValue(value); }
 
     virtual wxString GetRange(long from, long to) const;
 
diff --git a/include/wx/textctrl.h b/include/wx/textctrl.h
index 172301b6ad..39908a03bf 100644
--- a/include/wx/textctrl.h
+++ b/include/wx/textctrl.h
@@ -300,6 +300,8 @@ public:
     virtual wxString GetValue() const = 0;
     virtual void SetValue(const wxString& value) = 0;
 
+    virtual bool IsEmpty() const { return GetValue().empty(); }
+
     virtual void ChangeValue(const wxString &value) = 0;
 
     virtual wxString GetRange(long from, long to) const;
diff --git a/src/gtk/textctrl.cpp b/src/gtk/textctrl.cpp
index f10fd64e01..cf14bf7797 100644
--- a/src/gtk/textctrl.cpp
+++ b/src/gtk/textctrl.cpp
@@ -821,6 +821,14 @@ wxFontEncoding wxTextCtrl::GetTextEncoding() const
     return enc;
 }
 
+bool wxTextCtrl::IsEmpty() const
+{
+    if ( IsMultiLine() )
+        return gtk_text_buffer_get_char_count(m_buffer) != 0;
+
+    return wxTextCtrlBase::IsEmpty();
+}
+
 void wxTextCtrl::DoSetValue( const wxString &value, int flags )
 {
     wxCHECK_RET( m_text != NULL, wxT("invalid text ctrl") );
diff --git a/src/msw/textctrl.cpp b/src/msw/textctrl.cpp
index a71654a1ec..53ec9740c7 100644
--- a/src/msw/textctrl.cpp
+++ b/src/msw/textctrl.cpp
@@ -662,6 +662,15 @@ void wxTextCtrl::SetWindowStyleFlag(long style)
 // set/get the controls text
 // ----------------------------------------------------------------------------
 
+bool wxTextCtrl::IsEmpty() const
+{
+    // this is an optimization for multiline controls containing a lot of text
+    if ( IsMultiLine() && GetNumberOfLines() != 1 )
+        return false;
+
+    return wxTextCtrlBase::IsEmpty();
+}
+
 wxString wxTextCtrl::GetValue() const
 {
     // range 0..-1 is special for GetRange() and means to retrieve all text
-- 
2.45.2