# git-gui font chooser
# Copyright (C) 2007 Shawn Pearce

class choose_font {

field w
field w_family    ; # UI widget of all known family names
field w_example   ; # Example to showcase the chosen font

field f_family    ; # Currently chosen family name
field f_size      ; # Currently chosen point size

field v_family    ; # Name of global variable for family
field v_size      ; # Name of global variable for size

variable all_families [list]  ; # All fonts known to Tk

constructor pick {path title a_family a_size} {
        variable all_families

        set v_family $a_family
        set v_size $a_size

        upvar #0 $v_family pv_family
        upvar #0 $v_size pv_size

        set f_family $pv_family
        set f_size $pv_size

        make_toplevel top w
        wm title $top "[appname] ([reponame]): $title"
        wm geometry $top "+[winfo rootx $path]+[winfo rooty $path]"

        label $w.header -text $title -font font_uibold
        pack $w.header -side top -fill x

        frame $w.buttons
        button $w.buttons.select \
                -text [mc Select] \
                -default active \
                -command [cb _select]
        button $w.buttons.cancel \
                -text [mc Cancel] \
                -command [list destroy $w]
        pack $w.buttons.select -side right
        pack $w.buttons.cancel -side right -padx 5
        pack $w.buttons -side bottom -fill x -pady 10 -padx 10

        frame $w.inner

        frame $w.inner.family
        label $w.inner.family.l \
                -text [mc "Font Family"] \
                -anchor w
        set w_family $w.inner.family.v
        text $w_family \
                -background white \
                -foreground black \
                -borderwidth 1 \
                -relief sunken \
                -cursor $::cursor_ptr \
                -wrap none \
                -width 30 \
                -height 10 \
                -yscrollcommand [list $w.inner.family.sby set]
        rmsel_tag $w_family
        scrollbar $w.inner.family.sby -command [list $w_family yview]
        pack $w.inner.family.l -side top -fill x
        pack $w.inner.family.sby -side right -fill y
        pack $w_family -fill both -expand 1

        frame $w.inner.size
        label $w.inner.size.l \
                -text [mc "Font Size"] \
                -anchor w
        spinbox $w.inner.size.v \
                -textvariable @f_size \
                -from 2 -to 80 -increment 1 \
                -width 3
        bind $w.inner.size.v <FocusIn> {%W selection range 0 end}
        pack $w.inner.size.l -fill x -side top
        pack $w.inner.size.v -fill x -padx 2

        grid configure $w.inner.family $w.inner.size -sticky nsew
        grid rowconfigure $w.inner 0 -weight 1
        grid columnconfigure $w.inner 0 -weight 1
        pack $w.inner -fill both -expand 1 -padx 5 -pady 5

        frame $w.example
        label $w.example.l \
                -text [mc "Font Example"] \
                -anchor w
        set w_example $w.example.t
        text $w_example \
                -background white \
                -foreground black \
                -borderwidth 1 \
                -relief sunken \
                -height 3 \
                -width 40
        rmsel_tag $w_example
        $w_example tag conf example -justify center
        $w_example insert end [mc "This is example text.\nIf you like this text, it can be your font."] example
        $w_example conf -state disabled
        pack $w.example.l -fill x
        pack $w_example -fill x
        pack $w.example -fill x -padx 5

        if {$all_families eq {}} {
                set all_families [lsort [font families]]
        }

        $w_family tag conf pick
        $w_family tag bind pick <Button-1> [cb _pick_family %x %y]\;break
        foreach f $all_families {
                set sel [list pick]
                if {$f eq $f_family} {
                        lappend sel in_sel
                }
                $w_family insert end "$f\n" $sel
        }
        $w_family conf -state disabled
        _update $this

        trace add variable @f_size write [cb _update]
        bind $w <Key-Escape> [list destroy $w]
        bind $w <Key-Return> [cb _select]\;break
        bind $w <Visibility> "
                grab $w
                focus $w
        "
        tkwait window $w
}

method _select {} {
        upvar #0 $v_family pv_family
        upvar #0 $v_size pv_size

        set pv_family $f_family
        set pv_size $f_size

        destroy $w
}

method _pick_family {x y} {
        variable all_families

        set i [lindex [split [$w_family index @$x,$y] .] 0]
        set n [lindex $all_families [expr {$i - 1}]]
        if {$n ne {}} {
                $w_family tag remove in_sel 0.0 end
                $w_family tag add in_sel $i.0 [expr {$i + 1}].0
                set f_family $n
                _update $this
        }
}

method _update {args} {
        variable all_families

        set i [lsearch -exact $all_families $f_family]
        if {$i < 0} return

        $w_example tag conf example -font [list $f_family $f_size]
        $w_family see [expr {$i + 1}].0
}

}