101 lines
3 KiB
C
101 lines
3 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// Name: wx/textwrapper.h
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// Purpose: documentation of wxTextWrapper interface
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// Author: Vadim Zeitlin
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// Copyright: (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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@class wxTextWrapper
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Helps wrap lines of text to given width.
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This is a generic purpose class which can be used to wrap lines of text to
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the specified width. It doesn't do anything by itself but simply calls its
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virtual OnOutputLine() and OnNewLine() methods for each wrapped line of
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text, you need to implement them in your derived class to actually do
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something useful.
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Here is an example function using this class which inserts hard line breaks
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into a string of text at the positions where it would be wrapped:
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@code
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wxString WrapText(wxWindow *win, const wxString& text, int widthMax)
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{
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class HardBreakWrapper : public wxTextWrapper
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{
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public:
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HardBreakWrapper(wxWindow *win, const wxString& text, int widthMax)
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{
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Wrap(win, text, widthMax);
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}
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wxString const& GetWrapped() const { return m_wrapped; }
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protected:
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virtual void OnOutputLine(const wxString& line)
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{
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m_wrapped += line;
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}
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virtual void OnNewLine()
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{
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m_wrapped += '\n';
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}
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private:
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wxString m_wrapped;
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};
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HardBreakWrapper wrapper(win, text, widthMax);
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return wrapper.GetWrapped();
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}
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@endcode
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@nolibrary
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@category{gdi}
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*/
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class wxTextWrapper
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{
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public:
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/**
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Trivial default constructor.
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*/
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wxTextWrapper();
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/**
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Wrap the given text.
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This method will call OnOutputLine() for every line of wrapped text and
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OnNewLine() before the beginning of every new line after the first one
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(so it might be never called at all if the width of entire @a text is
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less than @a widthMax).
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@param win
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A non-@NULL window used for measuring the text extents.
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@param text
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The text to wrap.
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@param widthMax
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Maximal width of each line of text or @c -1 to disable wrapping.
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*/
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void Wrap(wxWindow *win, const wxString& text, int widthMax);
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protected:
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/**
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Called by Wrap() for each wrapped line of text.
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This method will always be called at least once by Wrap(). Notice that
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@a line may be empty if the text passed to Wrap() was empty itself.
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*/
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virtual void OnOutputLine(const wxString& line) = 0;
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/**
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Called at the start of each subsequent line of text by Wrap().
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This method may not be called at all if the entire text passed to
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Wrap() fits into the specified width.
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*/
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virtual void OnNewLine();
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};
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