# Functions for supporting the use of themed Tk widgets in git-gui.
# Copyright (C) 2009 Pat Thoyts <patthoyts@users.sourceforge.net>

proc ttk_get_current_theme {} {
        # Handle either current Tk or older versions of 8.5
        if {[catch {set theme [ttk::style theme use]}]} {
                set theme  $::ttk::currentTheme
        }
        return $theme
}

proc InitTheme {} {
        # Create a color label style (bg can be overridden by widget option)
        ttk::style layout Color.TLabel {
                Color.Label.border -sticky news -children {
                        Color.label.fill -sticky news -children {
                                Color.Label.padding -sticky news -children {
                                        Color.Label.label -sticky news}}}}
        eval [linsert [ttk::style configure TLabel] 0 \
                          ttk::style configure Color.TLabel]
        ttk::style configure Color.TLabel \
                -borderwidth 0 -relief flat -padding 2
        ttk::style map Color.TLabel -background {{} gold}
        # We also need a padded label.
        ttk::style configure Padded.TLabel \
                -padding {5 5} -borderwidth 1 -relief solid
        # We need a gold frame.
        ttk::style layout Gold.TFrame {
                Gold.Frame.border -sticky nswe -children {
                        Gold.Frame.fill -sticky nswe}}
        ttk::style configure Gold.TFrame -background gold -relief flat
        # listboxes should have a theme border so embed in ttk::frame
        ttk::style layout SListbox.TFrame {
                SListbox.Frame.Entry.field -sticky news -border true -children {
                        SListbox.Frame.padding -sticky news
                }
        }

        set theme [ttk_get_current_theme]

        if {[lsearch -exact {default alt classic clam} $theme] != -1} {
                # Simple override of standard ttk::entry to change the field
                # packground according to a state flag. We should use 'user1'
                # but not all versions of 8.5 support that so make use of 'pressed'
                # which is not normally in use for entry widgets.
                ttk::style layout Edged.Entry [ttk::style layout TEntry]
                ttk::style map Edged.Entry {*}[ttk::style map TEntry]
                ttk::style configure Edged.Entry {*}[ttk::style configure TEntry] \
                        -fieldbackground lightgreen
                ttk::style map Edged.Entry -fieldbackground {
                        {pressed !disabled} lightpink
                }
        } else {
                # For fancier themes, in particular the Windows ones, the field
                # element may not support changing the background color. So instead
                # override the fill using the default fill element. If we overrode
                # the vista theme field element we would loose the themed border
                # of the widget.
                catch {
                        ttk::style element create color.fill from default
                }

                ttk::style layout Edged.Entry {
                        Edged.Entry.field -sticky nswe -border 0 -children {
                                Edged.Entry.border -sticky nswe -border 1 -children {
                                        Edged.Entry.padding -sticky nswe -children {
                                                Edged.Entry.color.fill -sticky nswe -children {
                                                        Edged.Entry.textarea -sticky nswe
                                                }
                                        }
                                }
                        }
                }

                ttk::style configure Edged.Entry {*}[ttk::style configure TEntry] \
                        -background lightgreen -padding 0 -borderwidth 0
                ttk::style map Edged.Entry {*}[ttk::style map TEntry] \
                        -background {{pressed !disabled} lightpink}
        }

        if {[lsearch [bind . <<ThemeChanged>>] InitTheme] == -1} {
                bind . <<ThemeChanged>> +[namespace code [list InitTheme]]
        }
}

# Define a style used for the surround of text widgets.
proc InitEntryFrame {} {
        ttk::style theme settings default {
                ttk::style layout EntryFrame {
                        EntryFrame.field -sticky nswe -border 0 -children {
                                EntryFrame.fill -sticky nswe -children {
                                        EntryFrame.padding -sticky nswe
                                }
                        }
                }
                ttk::style configure EntryFrame -padding 1 -relief sunken
                ttk::style map EntryFrame -background {}
        }
        ttk::style theme settings classic {
                ttk::style configure EntryFrame -padding 2 -relief sunken
                ttk::style map EntryFrame -background {}
        }
        ttk::style theme settings alt {
                ttk::style configure EntryFrame -padding 2
                ttk::style map EntryFrame -background {}
        }
        ttk::style theme settings clam {
                ttk::style configure EntryFrame -padding 2
                ttk::style map EntryFrame -background {}
        }

        # Ignore errors for missing native themes
        catch {
                ttk::style theme settings winnative {
                        ttk::style configure EntryFrame -padding 2
                }
                ttk::style theme settings xpnative {
                        ttk::style configure EntryFrame -padding 1
                        ttk::style element create EntryFrame.field vsapi \
                                EDIT 1 {disabled 4 focus 3 active 2 {} 1} -padding 1
                }
                ttk::style theme settings vista {
                        ttk::style configure EntryFrame -padding 2
                        ttk::style element create EntryFrame.field vsapi \
                                EDIT 6 {disabled 4 focus 3 active 2 {} 1} -padding 2
                }
        }

        bind EntryFrame <Enter> {%W instate !disabled {%W state active}}
        bind EntryFrame <Leave> {%W state !active}
        bind EntryFrame <<ThemeChanged>> {
                set pad [ttk::style lookup EntryFrame -padding]
                %W configure -padding [expr {$pad eq {} ? 1 : $pad}]
        }
}

proc gold_frame {w args} {
        global use_ttk
        if {$use_ttk} {
                eval [linsert $args 0 ttk::frame $w -style Gold.TFrame]
        } else {
                eval [linsert $args 0 frame $w -background gold]
        }
}

proc tlabel {w args} {
        global use_ttk
        if {$use_ttk} {
                set cmd [list ttk::label $w -style Color.TLabel]
                foreach {k v} $args {
                        switch -glob -- $k {
                                -activebackground {}
                                default { lappend cmd $k $v }
                        }
                }
                eval $cmd
        } else {
                eval [linsert $args 0 label $w]
        }
}

# The padded label gets used in the about class.
proc paddedlabel {w args} {
        global use_ttk
        if {$use_ttk} {
                eval [linsert $args 0 ttk::label $w -style Padded.TLabel]
        } else {
                eval [linsert $args 0 label $w \
                                  -padx 5 -pady 5 \
                                  -justify left \
                                  -anchor w \
                                  -borderwidth 1 \
                                  -relief solid]
        }
}

# Create a toplevel for use as a dialog.
# If available, sets the EWMH dialog hint and if ttk is enabled
# place a themed frame over the surface.
proc Dialog {w args} {
        eval [linsert $args 0 toplevel $w -class Dialog]
        catch {wm attributes $w -type dialog}
        pave_toplevel $w
        return $w
}

# Tk toplevels are not themed - so pave it over with a themed frame to get
# the base color correct per theme.
proc pave_toplevel {w} {
        global use_ttk
        if {$use_ttk && ![winfo exists $w.!paving]} {
                set paving [ttk::frame $w.!paving]
                place $paving -x 0 -y 0 -relwidth 1 -relheight 1
                lower $paving
        }
}

# Create a scrolled listbox with appropriate border for the current theme.
# On many themes the border for a scrolled listbox needs to go around the
# listbox and the scrollbar.
proc slistbox {w args} {
        global use_ttk NS
        if {$use_ttk} {
                set f [ttk::frame $w -style SListbox.TFrame -padding 2]
        } else {
                set f [frame $w -relief flat]
        }
    if {[catch {
                if {$use_ttk} {
                        eval [linsert $args 0 listbox $f.list -relief flat \
                                          -highlightthickness 0 -borderwidth 0]
                } else {
                        eval [linsert $args 0 listbox $f.list]
                }
        ${NS}::scrollbar $f.vs -command [list $f.list yview]
        $f.list configure -yscrollcommand [list $f.vs set]
        grid $f.list $f.vs -sticky news
        grid rowconfigure $f 0 -weight 1
        grid columnconfigure $f 0 -weight 1
                bind $f.list <<ListboxSelect>> \
                        [list event generate $w <<ListboxSelect>>]
        interp hide {} $w
        interp alias {} $w {} $f.list
    } err]} {
        destroy $f
        return -code error $err
    }
    return $w
}

# fetch the background color from a widget.
proc get_bg_color {w} {
        global use_ttk
        if {$use_ttk} {
                set bg [ttk::style lookup [winfo class $w] -background]
        } else {
                set bg [$w cget -background]
        }
        return $bg
}

# ttk::spinbox didn't get added until 8.6
proc tspinbox {w args} {
        global use_ttk
        if {$use_ttk && [llength [info commands ttk::spinbox]] > 0} {
                eval [linsert $args 0 ttk::spinbox $w]
        } else {
                eval [linsert $args 0 spinbox $w]
        }
}

# Create a text widget with any theme specific properties.
proc ttext {w args} {
        global use_ttk
        if {$use_ttk} {
                switch -- [ttk_get_current_theme] {
                        "vista" - "xpnative" {
                                lappend args -highlightthickness 0 -borderwidth 0
                        }
                }
        }
        set w [eval [linsert $args 0 text $w]]
        if {$use_ttk} {
                if {[winfo class [winfo parent $w]] eq "EntryFrame"} {
                        bind $w <FocusIn> {[winfo parent %W] state focus}
                        bind $w <FocusOut> {[winfo parent %W] state !focus}
                }
        }
        return $w
}

# themed frame suitable for surrounding a text field.
proc textframe {w args} {
        global use_ttk
        if {$use_ttk} {
                if {[catch {ttk::style layout EntryFrame}]} {
                        InitEntryFrame
                }
                eval [linsert $args 0 ttk::frame $w -class EntryFrame -style EntryFrame]
        } else {
                eval [linsert $args 0 frame $w]
        }
        return $w
}

proc tentry {w args} {
        global use_ttk
        if {$use_ttk} {
                InitTheme
                ttk::entry $w -style Edged.Entry
        } else {
                entry $w
        }

        rename $w _$w
        interp alias {} $w {} tentry_widgetproc $w
        eval [linsert $args 0 tentry_widgetproc $w configure]
        return $w
}
proc tentry_widgetproc {w cmd args} {
        global use_ttk
        switch -- $cmd {
                state {
                        if {$use_ttk} {
                                return [uplevel 1 [list _$w $cmd] $args]
                        } else {
                                if {[lsearch -exact $args pressed] != -1} {
                                        _$w configure -background lightpink
                                } else {
                                        _$w configure -background lightgreen
                                }
                        }
                }
                configure {
                        if {$use_ttk} {
                                if {[set n [lsearch -exact $args -background]] != -1} {
                                        set args [lreplace $args $n [incr n]]
                                        if {[llength $args] == 0} {return}
                                }
                        }
                        return [uplevel 1 [list _$w $cmd] $args]
                }
                default { return [uplevel 1 [list _$w $cmd] $args] }
        }
}

# Tk 8.6 provides a standard font selection dialog. This uses the native
# dialogs on Windows and MacOSX or a standard Tk dialog on X11.
proc tchoosefont {w title familyvar sizevar} {
        if {[package vsatisfies [package provide Tk] 8.6]} {
                upvar #0 $familyvar family
                upvar #0 $sizevar size
                tk fontchooser configure -parent $w -title $title \
                        -font [list $family $size] \
                        -command [list on_choosefont $familyvar $sizevar]
                tk fontchooser show
        } else {
                choose_font::pick $w $title $familyvar $sizevar
        }
}

# Called when the Tk 8.6 fontchooser selects a font.
proc on_choosefont {familyvar sizevar font} {
        upvar #0 $familyvar family
        upvar #0 $sizevar size
        set font [font actual $font]
        set family [dict get $font -family]
        set size [dict get $font -size]
}

# Local variables:
# mode: tcl
# indent-tabs-mode: t
# tab-width: 4
# End: