Tk::FontDialog3pm

Usage

    use Tk::FontDialog;
    $font = $top->FontDialog->Show;

Overview

Tk::FontDialog implements a font dialog widget.

The dialog is displayed by calling the Show method. The returned value is either the selected font (if the dialog was closed with the Ok button) or undef (otherwise). The exact type of the return value is either a Tk::Font object (in Tk800) or a font name string (usually something like "font1"). Both can be used as values in Tk "-font" options. See "GetDescriptiveFontName"

In the Family and Size listboxes, the font family and font size can be specified. The checkbuttons on the right turn on bold, italic, underlined and overstriked variants of the chosen font. A sample of the font is shown in the middle area.

With the "Alt sample" checkbutton, it is possible to show all characters in the charset instead of the default text. "Fixed only" restricts the font family list to fixed fonts only. If the "Nicefonts" checkbutton is set, then the font names in the listbox are displayed in the corresponding font. Note that this option can be slow if a lot of fonts are installed or for 16 bit fonts.

A click with the right button in the font size listbox pops up a window to enter arbitrary font sizes.

Options

-font

The dialog font.

-initfont

The initial font.

-fontsizes

A list of font sizes. The default contains sizes from 0 to 72 points (XXX or pixels?).

-nicefont

If set, font names are displayed in its font style. This may be slow, especially if you have many fonts or 16 bit fonts (e.g. Asian fonts).

-nicefontsbutton

If set to false, then the "Nice fonts" button is not displayed.

-fixedfont

If set, proportional font families are not listed, leaving only the fixed fonts. This is slow, as each font must be checked to see if it is fixed or proportional.

-fixedfontsbutton

If set to false, then the "Fixed fonts" button is not displayed.

-sampletext

The sample text which should contain all letters. The default is "The Quick Brown Fox Jumps Over The Lazy Dog" German readers may probably use "Franz jagt im komplett verwahrlosten Taxi quer durch Bayern".

Internationalization

There are a couple of options to change the labels of the dialog. Note that you can prepend a tilde ("~") to get an accelerator key with "Alt". Here is a list of these options with the default (English) setting:

-familylabel (Family:)

-sizelabel (Size:)

-weightlabel (Bold)

-slantlabel (Italic)

-underlinelabel (Underline)

-overstrikelabel (Overstrike)

-oklabel (OK)

-applylabel (Apply)

-cancellabel (Cancel)

-altsamplelabel (Alt sample)

-nicefontslabel (Nicefonts)

-fixedfontslabel (Fixed Only)

-title (Choose font)

-customsizetitle (Choose font size)

METHODS IN Tk::Widget

RefontTree(-font => $font)

Additionally, the convenience method RefontTree is defined in the Tk::Widget namespace. Using this method a font definition could be applied to a complete subtree of a widget. This is similar to the method RecolorTree. Calling RefontTree looks like this:

    $font = $mw->FontDialog->Show;
    $mainwindow->RefontTree(-font => $font) if defined $font;

By default RefontTree does not change the font of canvas elements. This can be done by specifying "-canvas => 1".

GetDescriptiveFontName($fontname)

Return a "descriptive" font name (just like form [3] as described in Tk::Font). The return value from the Show() method has the disadvantage that it is only valid for the current Tk session. A "descriptive" font name may be stored and reused later.

Caveat

Note that font names with whitespace like "New century schoolbook" or "MS Sans Serif" can cause problems when using in a -font option. The solution is to put the names in Tcl-like braces, like

    -font => "{New century schoolbook} 10"

Examples

To apply a selected font to a specific widget, use the following snippet:

    $font = $mw->FontDialog->Show;
    if (defined $font) {
        $button->configure(-font => $font);
    }

This example uses the convenience method RefontTree to apply the new font to the whole application:

    use Tk;
    use Tk::FontDialog;
    $mw = tkinit;
    $mw->Label(-text => "Test")->pack;
    $mw->Button(-text => "Another test")->pack;
    $mw->Button(-text => "Use Tk::FontDialog",
                -command => sub {
                    my $font = $mw->FontDialog->Show;
                    if (defined $font) {
                        $mw->RefontTree(-font => $font);
                    }
                })->pack;
    MainLoop;

To get the "descriptive" font name:

    $font = $mw->FontDialog->Show;
    if (defined $font) {
        $font_descriptive = $mw->GetDescriptiveFontName($font);
        print $font_descriptive, "\n";
    }

Bugs/todo

  - ConfigSpecs handling is poor
    put at least -font into configspecs
  - run test, call dialog for 2nd time: immediate change of font?
  - better name for nicefont
  - restrict on charsets and encodings (xlsfonts? X11::Protocol::ListFonts?)
    difficult because core Tk font handling ignores charsets and encodings