From 5d1b49193b778e39901b83097a34429db2e5b47b Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Tue, 16 Aug 2005 23:14:34 +0000
Subject: [PATCH] added wxStaticText::Wrap()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35202 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/changes.txt           |   1 +
 docs/latex/wx/stattext.tex |  13 ++
 include/wx/stattext.h      |   6 +
 src/common/dlgcmn.cpp      | 255 ++++++++++++++++++++++++++-----------
 version-script.in          |   1 +
 5 files changed, 199 insertions(+), 77 deletions(-)

diff --git a/docs/changes.txt b/docs/changes.txt
index 31f1fb7990..1b00eddd20 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -18,6 +18,7 @@ All:
 
 All (GUI):
 
+- Added wxStaticText::Wrap()
 - Added wxXmlResource::Unload().
 - Possibility of modeless wxWizard dialog (with presentation in sample).
 - Fixed a rare crash due to malformed HTML in wxHTML (Xavier Nodet).
diff --git a/docs/latex/wx/stattext.tex b/docs/latex/wx/stattext.tex
index 8f11d0bd7c..ab6f61f2c8 100644
--- a/docs/latex/wx/stattext.tex
+++ b/docs/latex/wx/stattext.tex
@@ -36,6 +36,7 @@ See also \helpref{window styles overview}{windowstyles}.
 
 \latexignore{\rtfignore{\wxheading{Members}}}
 
+
 \membersection{wxStaticText::wxStaticText}\label{wxstatictextconstr}
 
 \func{}{wxStaticText}{\void}
@@ -68,6 +69,7 @@ Constructor, creating and showing a text control.
 
 \helpref{wxStaticText::Create}{wxstatictextcreate}
 
+
 \membersection{wxStaticText::Create}\label{wxstatictextcreate}
 
 \func{bool}{Create}{\param{wxWindow* }{parent}, \param{wxWindowID}{ id},\rtfsp
@@ -76,12 +78,14 @@ Constructor, creating and showing a text control.
 
 Creation function, for two-step construction. For details see \helpref{wxStaticText::wxStaticText}{wxstatictextconstr}.
 
+
 \membersection{wxStaticText::GetLabel}\label{wxstatictextgetlabel}
 
 \constfunc{wxString}{GetLabel}{\void}
 
 Returns the contents of the control.
 
+
 \membersection{wxStaticText::SetLabel}\label{wxstatictextsetlabel}
 
 \func{virtual void}{SetLabel}{\param{const wxString\& }{ label}}
@@ -93,3 +97,12 @@ label unless the control has wxST\_NO\_AUTORESIZE flag.
 
 \docparam{label}{The new label to set. It may contain newline characters.}
 
+
+\membersection{wxStaticText::Wrap}\label{wxstatictextwrpa}
+
+\func{void}{Wrap}{\param{int }{width}}
+
+This functions wraps the controls label so that each of its lines becomes at
+most \arg{width} pixels wide if possible (the lines are broken at words
+boundaries so it might not be the case if words are too long). If \arg{width}
+is negative, no wrapping is done.
diff --git a/include/wx/stattext.h b/include/wx/stattext.h
index 4bfeec3318..8b0c667eb1 100644
--- a/include/wx/stattext.h
+++ b/include/wx/stattext.h
@@ -25,6 +25,12 @@ class WXDLLEXPORT wxStaticTextBase : public wxControl
 public:
     wxStaticTextBase() { }
 
+    // wrap the text of the control so that no line is longer than the given
+    // width (if possible: this function won't break words)
+    //
+    // NB: implemented in dlgcmn.cpp for now
+    void Wrap(int width);
+
     // overriden base virtuals
     virtual bool AcceptsFocus() const { return false; }
     virtual bool HasTransparentBackground() { return true; }
diff --git a/src/common/dlgcmn.cpp b/src/common/dlgcmn.cpp
index d32ba91318..6d3e218315 100644
--- a/src/common/dlgcmn.cpp
+++ b/src/common/dlgcmn.cpp
@@ -40,11 +40,63 @@
     #include "wx/containr.h"
 #endif
 
-//--------------------------------------------------------------------------
+#if wxUSE_STATTEXT
+
+// ----------------------------------------------------------------------------
+// wxTextWrapper
+// ----------------------------------------------------------------------------
+
+// this class is used to wrap the text on word boundary: wrapping is done by
+// calling OnStartLine() and OnOutputLine() functions
+class wxTextWrapper
+{
+public:
+    wxTextWrapper() { m_eol = false; }
+
+    // win is used for getting the font, text is the text to wrap, width is the
+    // max line width or -1 to disable wrapping
+    void Wrap(wxWindow *win, const wxString& text, int widthMax);
+
+protected:
+    // line may be empty
+    virtual void OnOutputLine(const wxString& line) = 0;
+
+    // called at the start of every new line (except the very first one)
+    virtual void OnNewLine() { }
+
+private:
+    // call OnOutputLine() and set m_eol to true
+    void DoOutputLine(const wxString& line)
+    {
+        OnOutputLine(line);
+
+        m_eol = true;
+    }
+
+    // this function is a destructive inspector: when it returns true it also
+    // resets the flag to false so calling it again woulnd't return true any
+    // more
+    bool IsStartOfNewLine()
+    {
+        if ( !m_eol )
+            return false;
+
+        m_eol = false;
+
+        return true;
+    }
+
+
+    bool m_eol;
+};
+
+#endif // wxUSE_STATTEXT
+
+// ----------------------------------------------------------------------------
 // wxDialogBase
-//--------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 
-// FIXME - temporary hack in absence of wxtopLevelWindow, should be always used
+// FIXME - temporary hack in absence of wxTopLevelWindow, should be always used
 #ifdef wxTopLevelWindowNative
 BEGIN_EVENT_TABLE(wxDialogBase, wxTopLevelWindow)
     WX_EVENT_TABLE_CONTROL_CONTAINER(wxDialogBase)
@@ -68,104 +120,153 @@ void wxDialogBase::Init()
 #endif
 }
 
-#if wxUSE_STATTEXT // && wxUSE_TEXTCTRL
+#if wxUSE_STATTEXT
 
-wxSizer *wxDialogBase::CreateTextSizer( const wxString& message )
+void wxTextWrapper::Wrap(wxWindow *win, const wxString& text, int widthMax)
 {
-    bool is_pda = (wxSystemSettings::GetScreenType() <= wxSYS_SCREEN_PDA);
+    const wxChar *lastSpace = NULL;
+    wxString line;
+
+    const wxChar *lineStart = text.c_str();
+    for ( const wxChar *p = lineStart; ; p++ )
+    {
+        if ( IsStartOfNewLine() )
+        {
+            OnNewLine();
+
+            lastSpace = NULL;
+            line.clear();
+            lineStart = p;
+        }
+
+        if ( *p == _T('\n') || *p == _T('\0') )
+        {
+            DoOutputLine(line);
+
+            if ( *p == _T('\0') )
+                break;
+        }
+        else // not EOL
+        {
+            if ( *p == _T(' ') )
+                lastSpace = p;
+
+            line += *p;
 
-    wxString text = message;
+            if ( widthMax >= 0 && lastSpace )
+            {
+                int width;
+                win->GetTextExtent(line, &width, NULL);
 
+                if ( width > widthMax )
+                {
+                    // remove the last word from this line
+                    line.erase(lastSpace - lineStart, p + 1 - lineStart);
+                    DoOutputLine(line);
+
+                    // go back to the last word of this line which we didn't
+                    // output yet
+                    p = lastSpace;
+                }
+            }
+            //else: no wrapping at all or impossible to wrap
+        }
+    }
+}
+
+wxSizer *wxDialogBase::CreateTextSizer(const wxString& message)
+{
     // I admit that this is complete bogus, but it makes
     // message boxes work for pda screens temporarily..
-    int max_width = -1;
+    int widthMax = -1;
+    const bool is_pda = wxSystemSettings::GetScreenType() <= wxSYS_SCREEN_PDA;
     if (is_pda)
     {
-        max_width = wxSystemSettings::GetMetric( wxSYS_SCREEN_X ) - 25;
-        text += wxT('\n');
+        widthMax = wxSystemSettings::GetMetric( wxSYS_SCREEN_X ) - 25;
     }
 
+    // '&' is used as accel mnemonic prefix in the wxWidgets controls but in
+    // the static messages created by CreateTextSizer() (used by wxMessageBox,
+    // for example), we don't want this special meaning, so we need to quote it
+    wxString text(message);
+    text.Replace(_T("&"), _T("&&"));
 
-    wxBoxSizer *box = new wxBoxSizer( wxVERTICAL );
-
-    // get line height for empty lines
-    int y = 0;
-    wxFont font( GetFont() );
-    if (!font.Ok())
-        font = *wxSWISS_FONT;
-    GetTextExtent( wxT("H"), (int*)NULL, &y, (int*)NULL, (int*)NULL, &font);
 
-    size_t last_space = 0;
-    wxString line;
-    for ( size_t pos = 0; pos < text.length(); pos++ )
+    class TextSizerWrapper : public wxTextWrapper
     {
-        switch ( text[pos] )
+    public:
+        TextSizerWrapper(wxWindow *win)
         {
-            case wxT('\n'):
-                if (!line.empty())
-                {
-                    wxStaticText *s = new wxStaticText( this, wxID_ANY, line );
-                    box->Add( s );
-                    line = wxEmptyString;
-                }
-                else
-                {
-                    box->Add( 5, y );
-                }
-                break;
+            m_win = win;
+            m_hLine = 0;
+        }
+
+        wxSizer *CreateSizer(const wxString& text, int widthMax)
+        {
+            m_sizer = new wxBoxSizer(wxVERTICAL);
+            Wrap(m_win, text, widthMax);
+            return m_sizer;
+        }
 
-            case wxT('&'):
-                // this is used as accel mnemonic prefix in the wxWidgets
-                // controls but in the static messages created by
-                // CreateTextSizer() (used by wxMessageBox, for example), we
-                // don't want this special meaning, so we need to quote it
-                line += wxT('&');
+    protected:
+        virtual void OnOutputLine(const wxString& line)
+        {
+            if ( !line.empty() )
+            {
+                m_sizer->Add(new wxStaticText(m_win, wxID_ANY, line));
+            }
+            else // empty line, no need to create a control for it
+            {
+                if ( !m_hLine )
+                    m_hLine = m_win->GetCharHeight();
+
+                m_sizer->Add(5, m_hLine);
+            }
+        }
 
-                // fall through to add it normally too
+    private:
+        wxWindow *m_win;
+        wxSizer *m_sizer;
+        int m_hLine;
+    };
 
-            default:
-                if (text[pos] == wxT(' '))
-                    last_space = pos;
+    TextSizerWrapper wrapper(this);
 
-                line += message[pos];
+    return wrapper.CreateSizer(text, widthMax);
+}
 
-                if (is_pda)
-                {
-                    int width = 0;
-                    GetTextExtent( line, &width, (int*)NULL, (int*)NULL, (int*)NULL, &font );
-
-                    if (width > max_width)
-                    {
-                        // exception if there was no previous space
-                        if (last_space == 0)
-                            last_space = pos;
-
-                        int diff = pos-last_space;
-                        int len = line.Len();
-                        line.Remove( len-diff, diff );
-
-                        wxStaticText *s = new wxStaticText( this, wxID_ANY, line );
-                        box->Add( s );
-
-                        pos = last_space;
-                        last_space = 0;
-                        line = wxEmptyString;
-                    }
-                }
+void wxStaticTextBase::Wrap(int width)
+{
+    class LabelWrapper : public wxTextWrapper
+    {
+    public:
+        void WrapLabel(wxStaticTextBase *text, int widthMax)
+        {
+            m_text.clear();
+            Wrap(text, text->GetLabel(), widthMax);
+            text->SetLabel(m_text);
         }
-    }
 
-    // remaining text behind last '\n'
-    if (!line.empty())
-    {
-        wxStaticText *s2 = new wxStaticText( this, wxID_ANY, line );
-        box->Add( s2 );
-    }
+    protected:
+        virtual void OnOutputLine(const wxString& line)
+        {
+            m_text += line;
+        }
+
+        virtual void OnNewLine()
+        {
+            m_text += _T('\n');
+        }
+
+    private:
+        wxString m_text;
+    };
 
-    return box;
+    LabelWrapper wrapper;
+    wrapper.WrapLabel(this, width);
 }
 
-#endif // wxUSE_STATTEXT // && wxUSE_TEXTCTRL
+#endif // wxUSE_STATTEXT
 
 #if wxUSE_BUTTON
 
diff --git a/version-script.in b/version-script.in
index 36ef28913f..691247f8bd 100644
--- a/version-script.in
+++ b/version-script.in
@@ -23,6 +23,7 @@
         *wxMediaCtrl*ShowPlayerControls*wxMediaPlayerControls*;
         *wxMessageOutputBest*;
         *wxShadowObject*;
+        *wxStaticText*Wrap*;
         *wxTopLevelWindowGTK*RequestUserAttention*;
         *wxWindowMSW*MSWWindowProc*;
         *wxWizard*FinishLayout*;
-- 
2.50.0

