docs/latex/wx/tcommdlg.tex

   1 \section{Common dialogs overview}\label{commondialogsoverview}
   2
   3 Classes: \helpref{wxColourDialog}{wxcolourdialog}, \helpref{wxFontDialog}{wxfontdialog},
   4 \rtfsp\helpref{wxPrintDialog}{wxprintdialog}, \helpref{wxFileDialog}{wxfiledialog},\rtfsp
   5 \helpref{wxDirDialog}{wxdirdialog}, \helpref{wxTextEntryDialog}{wxtextentrydialog},\rtfsp
   6 \helpref{wxMessageDialog}{wxmessagedialog}, \helpref{wxSingleChoiceDialog}{wxsinglechoicedialog},\rtfsp
   7 \helpref{wxMultiChoiceDialog}{wxmultichoicedialog}
   8
   9 Common dialog classes and functions encapsulate commonly-needed dialog box requirements.
  10 They are all `modal', grabbing the flow of control until the user dismisses the dialog,
  11 to make them easy to use within an application.
  12
  13 Some dialogs have both platform-dependent and platform-independent implementations,
  14 so that if underlying windowing systems do not provide the required functionality,
  15 the generic classes and functions can stand in. For example, under MS Windows, wxColourDialog
  16 uses the standard colour selector. There is also an equivalent called wxGenericColourDialog
  17 for other platforms, and a macro defines wxColourDialog to be the same as wxGenericColourDialog
  18 on non-MS Windows platforms. However, under MS Windows, the generic dialog can also be
  19 used, for testing or other purposes.
  20
  21 \subsection{wxColourDialog overview}\label{wxcolourdialogoverview}
  22
  23 Classes: \helpref{wxColourDialog}{wxcolourdialog}, \helpref{wxColourData}{wxcolourdata}
  24
  25 The wxColourDialog presents a colour selector to the user, and returns
  26 with colour information.
  27
  28 {\bf The MS Windows colour selector}
  29
  30 Under Windows, the native colour selector common dialog is used. This
  31 presents a dialog box with three main regions: at the top left, a
  32 palette of 48 commonly-used colours is shown. Under this, there is a
  33 palette of 16 `custom colours' which can be set by the application if
  34 desired. Additionally, the user may open up the dialog box to show
  35 a right-hand panel containing controls to select a precise colour, and add
  36 it to the custom colour palette.
  37
  38 {\bf The generic colour selector}
  39
  40 Under non-MS Windows platforms, the colour selector is a simulation of
  41 most of the features of the MS Windows selector. Two palettes of 48
  42 standard and 16 custom colours are presented, with the right-hand area
  43 containing three sliders for the user to select a colour from red,
  44 green and blue components. This colour may be added to the custom colour
  45 palette, and will replace either the currently selected custom colour,
  46 or the first one in the palette if none is selected. The RGB colour sliders
  47 are not optional in the generic colour selector. The generic colour
  48 selector is also available under MS Windows; use the name
  49 wxGenericColourDialog.
  50
  51 {\bf Example}
  52
  53 In the samples/dialogs directory, there is an example of using
  54 the wxColourDialog class. Here is an excerpt, which
  55 sets various parameters of a wxColourData object, including
  56 a grey scale for the custom colours. If the user did not cancel
  57 the dialog, the application retrieves the selected colour and
  58 uses it to set the background of a window.
  59
  60 \begin{verbatim}
  61   wxColourData data;
  62   data.SetChooseFull(true);
  63   for (int i = 0; i < 16; i++)
  64   {
  65     wxColour colour(i*16, i*16, i*16);
  66     data.SetCustomColour(i, colour);
  67   }
  68
  69   wxColourDialog dialog(this, &data);
  70   if (dialog.ShowModal() == wxID_OK)
  71   {
  72     wxColourData retData = dialog.GetColourData();
  73     wxColour col = retData.GetColour();
  74     wxBrush brush(col, wxSOLID);
  75     myWindow->SetBackground(brush);
  76     myWindow->Clear();
  77     myWindow->Refresh();
  78   }
  79 \end{verbatim}
  80
  81
  82 \subsection{wxFontDialog overview}\label{wxfontdialogoverview}
  83
  84 Classes: \helpref{wxFontDialog}{wxfontdialog}, \helpref{wxFontData}{wxfontdata}
  85
  86 The wxFontDialog presents a font selector to the user, and returns
  87 with font and colour information.
  88
  89 {\bf The MS Windows font selector}
  90
  91 Under Windows, the native font selector common dialog is used. This
  92 presents a dialog box with controls for font name, point size, style, weight,
  93 underlining, strikeout and text foreground colour. A sample of the
  94 font is shown on a white area of the dialog box. Note that
  95 in the translation from full MS Windows fonts to wxWidgets font
  96 conventions, strikeout is ignored and a font family (such as
  97 Swiss or Modern) is deduced from the actual font name (such as Arial
  98 or Courier).
  99
 100 {\bf The generic font selector}
 101
 102 Under non-MS Windows platforms, the font selector is simpler.
 103 Controls for font family, point size, style, weight,
 104 underlining and text foreground colour are provided, and
 105 a sample is shown upon a white background. The generic font selector
 106 is also available under MS Windows; use the name wxGenericFontDialog.
 107
 108 {\bf Example}
 109
 110 In the samples/dialogs directory, there is an example of using
 111 the wxFontDialog class. The application uses the returned font
 112 and colour for drawing text on a canvas. Here is an excerpt:
 113
 114 \begin{verbatim}
 115   wxFontData data;
 116   data.SetInitialFont(canvasFont);
 117   data.SetColour(canvasTextColour);
 118
 119   wxFontDialog dialog(this, &data);
 120   if (dialog.ShowModal() == wxID_OK)
 121   {
 122     wxFontData retData = dialog.GetFontData();
 123     canvasFont = retData.GetChosenFont();
 124     canvasTextColour = retData.GetColour();
 125     myWindow->Refresh();
 126   }
 127 \end{verbatim}
 128
 129 \subsection{wxPrintDialog overview}\label{wxprintdialogoverview}
 130
 131 Classes: \helpref{wxPrintDialog}{wxprintdialog}, \helpref{wxPrintData}{wxprintdata}
 132
 133 This class represents the print and print setup common dialogs.
 134 You may obtain a \helpref{wxPrinterDC}{wxprinterdc} device context from
 135 a successfully dismissed print dialog.
 136
 137 The samples/printing example shows how to use it: see \helpref{Printing overview}{printingoverview} for
 138 an excerpt from this example.
 139
 140 \subsection{wxFileDialog overview}\label{wxfiledialogoverview}
 141
 142 Classes: \helpref{wxFileDialog}{wxfiledialog}
 143
 144 Pops up a file selector box. In Windows, this is the common file selector
 145 dialog. In X, this is a file selector box with somewhat less functionality.
 146 The path and filename are distinct elements of a full file pathname.
 147 If path is ``", the current directory will be used. If filename is ``",
 148 no default filename will be supplied. The wildcard determines what files
 149 are displayed in the file selector, and file extension supplies a type
 150 extension for the required filename. Flags may be a combination of wxOPEN,
 151 wxSAVE, wxOVERWRITE\_PROMPT, wxHIDE\_READONLY, wxFILE\_MUST\_EXIST or 0.
 152
 153 Both the X and Windows versions implement a wildcard filter. Typing a
 154 filename containing wildcards (*, ?) in the filename text item, and
 155 clicking on Ok, will result in only those files matching the pattern being
 156 displayed. In the X version, supplying no default name will result in the
 157 wildcard filter being inserted in the filename text item; the filter is
 158 ignored if a default name is supplied.
 159
 160 The wildcard may be a specification for multiple
 161 types of file with a description for each, such as:
 162
 163 \begin{verbatim}
 164  "BMP files (*.bmp)|*.bmp|GIF files (*.gif)|*.gif"
 165 \end{verbatim}
 166
 167 \subsection{wxDirDialog overview}\label{wxdirdialogoverview}
 168
 169 Classes: \helpref{wxDirDialog}{wxdirdialog}
 170
 171 This dialog shows a directory selector dialog, allowing the user to select a single
 172 directory.
 173
 174 \subsection{wxTextEntryDialog overview}\label{wxtextentrydialogoverview}
 175
 176 Classes: \helpref{wxTextEntryDialog}{wxtextentrydialog}
 177
 178 This is a dialog with a text entry field. The value that the user
 179 entered is obtained using \helpref{wxTextEntryDialog::GetValue}{wxtextentrydialoggetvalue}.
 180
 181 \subsection{wxMessageDialog overview}\label{wxmessagedialogoverview}
 182
 183 Classes: \helpref{wxMessageDialog}{wxmessagedialog}
 184
 185 This dialog shows a message, plus buttons that can be chosen from OK, Cancel, Yes, and No.
 186 Under Windows, an optional icon can be shown, such as an exclamation mark or question mark.
 187
 188 The return value of \helpref{wxMessageDialog::ShowModal}{wxmessagedialogshowmodal} indicates
 189 which button the user pressed.
 190
 191 \subsection{wxSingleChoiceDialog overview}\label{wxsinglechoicedialogoverview}
 192
 193 Classes: \helpref{wxSingleChoiceDialog}{wxsinglechoicedialog}
 194
 195 This dialog shows a list of choices, plus OK and (optionally) Cancel. The user can
 196 select one of them. The selection can be obtained from the dialog as an index,
 197 a string or client data.
 198
 199 \subsection{wxMultiChoiceDialog overview}\label{wxmultichoicedialogoverview}
 200
 201 Classes: \helpref{wxMultiChoiceDialog}{wxmultichoicedialog}
 202
 203 This dialog shows a list of choices, plus OK and (optionally) Cancel. The user can
 204 select one or more of them.
 205