interface/wx/control.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        control.h
   3 // Purpose:     interface of wxControl
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     Flags used by wxControl::Ellipsize function.
  11 */
  12 enum wxEllipsizeFlags
  13 {
  14     /// No special flags.
  15     wxELLIPSIZE_FLAGS_NONE = 0,
  16
  17     /**
  18         Take mnemonics into account when calculating the text width.
  19
  20         With this flag when calculating the size of the passed string,
  21         mnemonics characters (see wxControl::SetLabel) will be automatically
  22         reduced to a single character. This leads to correct calculations only
  23         if the string passed to Ellipsize() will be used with
  24         wxControl::SetLabel. If you don't want ampersand to be interpreted as
  25         mnemonics (e.g. because you use wxControl::SetLabelText) then don't use
  26         this flag.
  27      */
  28     wxELLIPSIZE_FLAGS_PROCESS_MNEMONICS = 1,
  29
  30     /**
  31         Expand tabs in spaces when calculating the text width.
  32
  33         This flag tells wxControl::Ellipsize() to calculate the width of tab
  34         characters @c '\\t' as 6 spaces.
  35      */
  36     wxELLIPSIZE_FLAGS_EXPAND_TABS = 2,
  37
  38     /// The default flags for wxControl::Ellipsize.
  39     wxELLIPSIZE_FLAGS_DEFAULT = wxELLIPSIZE_FLAGS_PROCESS_MNEMONICS|
  40                                 wxELLIPSIZE_FLAGS_EXPAND_TABS
  41 };
  42
  43
  44 /**
  45     The different ellipsization modes supported by the
  46     wxControl::Ellipsize function.
  47 */
  48 enum wxEllipsizeMode
  49 {
  50     /// Don't ellipsize the text at all. @since 2.9.1
  51     wxELLIPSIZE_NONE,
  52
  53     /// Put the ellipsis at the start of the string, if the string needs ellipsization.
  54     wxELLIPSIZE_START,
  55
  56     /// Put the ellipsis in the middle of the string, if the string needs ellipsization.
  57     wxELLIPSIZE_MIDDLE,
  58
  59     /// Put the ellipsis at the end of the string, if the string needs ellipsization.
  60     wxELLIPSIZE_END
  61 };
  62
  63 /**
  64     @class wxControl
  65
  66     This is the base class for a control or "widget".
  67
  68     A control is generally a small window which processes user input and/or
  69     displays one or more item of data.
  70
  71     @beginEventEmissionTable{wxClipboardTextEvent}
  72     @event{EVT_TEXT_COPY(id, func)}
  73            Some or all of the controls content was copied to the clipboard.
  74     @event{EVT_TEXT_CUT(id, func)}
  75            Some or all of the controls content was cut (i.e. copied and
  76            deleted).
  77     @event{EVT_TEXT_PASTE(id, func)}
  78            Clipboard content was pasted into the control.
  79     @endEventTable
  80
  81     @library{wxcore}
  82     @category{ctrl}
  83
  84     @see wxValidator
  85 */
  86 class wxControl : public wxWindow
  87 {
  88 public:
  89     /**
  90         Simulates the effect of the user issuing a command to the item.
  91
  92         @see wxCommandEvent
  93     */
  94     virtual void Command(wxCommandEvent& event);
  95
  96     /**
  97         Returns the control's label, as it was passed to SetLabel().
  98
  99         Note that the returned string may contains mnemonics ("&" characters) if they were
 100         passed to the SetLabel() function; use GetLabelText() if they are undesired.
 101
 102         Also note that the returned string is always the string which was passed to
 103         SetLabel() but may be different from the string passed to SetLabelText()
 104         (since this last one escapes mnemonic characters).
 105     */
 106     wxString GetLabel() const;
 107
 108     /**
 109         Returns the control's label without mnemonics.
 110
 111         Note that because of the stripping of the mnemonics the returned string may differ
 112         from the string which was passed to SetLabel() but should always be the same which
 113         was passed to SetLabelText().
 114     */
 115     wxString GetLabelText() const;
 116
 117     /**
 118         Sets the control's label.
 119
 120         All "&" characters in the @a label are special and indicate that the
 121         following character is a @e mnemonic for this control and can be used to
 122         activate it from the keyboard (typically by using @e Alt key in
 123         combination with it). To insert a literal ampersand character, you need
 124         to double it, i.e. use use "&&". If this behaviour is undesirable, use
 125         SetLabelText() instead.
 126     */
 127     void SetLabel(const wxString& label);
 128
 129     /**
 130         Sets the control's label to exactly the given string.
 131
 132         Unlike SetLabel(), this function shows exactly the @a text passed to it
 133         in the control, without interpreting ampersands in it in any way.
 134         Notice that it means that the control can't have any mnemonic defined
 135         for it using this function.
 136
 137         @see EscapeMnemonics()
 138      */
 139     void SetLabelText(const wxString& text);
 140
 141
 142 public:     // static functions
 143
 144     /**
 145         Returns the given @a label string without mnemonics ("&" characters).
 146     */
 147     static wxString GetLabelText(const wxString& label);
 148
 149     /**
 150         Returns the given @a str string without mnemonics ("&" characters).
 151
 152         @note This function is identic to GetLabelText() and is provided both for symmetry
 153               with the wxStaticText::RemoveMarkup() function and to allow to write more
 154               readable code (since this function has a more descriptive name respect GetLabelText()).
 155     */
 156     static wxString RemoveMnemonics(const wxString& str);
 157
 158     /**
 159         Escapes the special mnemonics characters ("&") in the given string.
 160
 161         This function can be helpful if you need to set the controls label to a
 162         user-provided string. If the string contains ampersands, they wouldn't
 163         appear on the display but be used instead to indicate that the
 164         character following the first of them can be used as a control mnemonic.
 165         While this can sometimes be desirable (e.g. to allow the user to
 166         configure mnemonics of the controls), more often you will want to use
 167         this function before passing a user-defined string to SetLabel().
 168         Alternatively, if the label is entirely user-defined, you can just call
 169         SetLabelText() directly -- but this function must be used if the label
 170         is a combination of a part defined by program containing the control
 171         mnemonics and a user-defined part.
 172
 173         @param text
 174             The string such as it should appear on the display.
 175         @return
 176             The same string with the ampersands in it doubled.
 177      */
 178     static wxString EscapeMnemonics(const wxString& text);
 179
 180     /**
 181         Replaces parts of the @a label string with ellipsis, if needed, so
 182         that it doesn't exceed @a maxWidth.
 183
 184         Note that this functions is guaranteed to always returns a string
 185         whose rendering on the given DC takes less than @a maxWidth pixels
 186         in horizontal.
 187
 188         @param label
 189             The string to ellipsize
 190         @param dc
 191             The DC used to retrieve the character widths through the
 192             wxDC::GetPartialTextExtents() function.
 193         @param mode
 194             The ellipsization mode. This is the setting which determines
 195             which part of the string should be replaced by the ellipsis.
 196             See ::wxEllipsizeMode enumeration values for more info.
 197         @param maxWidth
 198             The maximum width of the returned string in pixels.
 199             This argument determines how much characters of the string need to
 200             be removed (and replaced by ellipsis).
 201         @param flags
 202             One or more of the ::wxEllipsizeFlags enumeration values combined.
 203     */
 204     static wxString Ellipsize(const wxString& label, const wxDC& dc,
 205                               wxEllipsizeMode mode, int maxWidth,
 206                               int flags = wxELLIPSIZE_FLAGS_DEFAULT);
 207 };
 208