313 lines
6.9 KiB
Tcl
313 lines
6.9 KiB
Tcl
# git-gui status bar mega-widget
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# Copyright (C) 2007 Shawn Pearce
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# The status_bar class manages the entire status bar. It is possible for
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# multiple overlapping asynchronous operations to want to display status
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# simultaneously. Each one receives a status_bar_operation when it calls the
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# start method, and the status bar combines all active operations into the
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# line of text it displays. Most of the time, there will be at most one
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# ongoing operation.
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#
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# Note that the entire status bar can be either in single-line or two-line
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# mode, depending on the constructor. Multiple active operations are only
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# supported for single-line status bars.
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class status_bar {
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field allow_multiple ; # configured at construction
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field w ; # our own window path
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field w_l ; # text widget we draw messages into
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field w_c ; # canvas we draw a progress bar into
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field c_pack ; # script to pack the canvas with
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field baseline_text ; # text to show if there are no operations
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field status_bar_text ; # combined text for all operations
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field operations ; # list of current ongoing operations
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# The status bar can display a progress bar, updated when consumers call the
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# update method on their status_bar_operation. When there are multiple
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# operations, the status bar shows the combined status of all operations.
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#
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# When an overlapping operation completes, the progress bar is going to
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# abruptly have one fewer operation in the calculation, causing a discontinuity.
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# Therefore, whenever an operation completes, if it is not the last operation,
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# this counter is increased, and the progress bar is calculated as though there
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# were still another operation at 100%. When the last operation completes, this
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# is reset to 0.
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field completed_operation_count
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constructor new {path} {
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global use_ttk NS
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set w $path
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set w_l $w.l
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set w_c $w.c
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# Standard single-line status bar: Permit overlapping operations
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set allow_multiple 1
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set baseline_text ""
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set operations [list]
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set completed_operation_count 0
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${NS}::frame $w
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if {!$use_ttk} {
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$w configure -borderwidth 1 -relief sunken
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}
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${NS}::label $w_l \
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-textvariable @status_bar_text \
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-anchor w \
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-justify left
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pack $w_l -side left
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set c_pack [cb _oneline_pack]
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bind $w <Destroy> [cb _delete %W]
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return $this
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}
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method _oneline_pack {} {
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$w_c conf -width 100
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pack $w_c -side right
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}
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constructor two_line {path} {
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global NS
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set w $path
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set w_l $w.l
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set w_c $w.c
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# Two-line status bar: Only one ongoing operation permitted.
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set allow_multiple 0
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set baseline_text ""
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set operations [list]
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set completed_operation_count 0
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${NS}::frame $w
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${NS}::label $w_l \
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-textvariable @status_bar_text \
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-anchor w \
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-justify left
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pack $w_l -anchor w -fill x
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set c_pack [list pack $w_c -fill x]
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bind $w <Destroy> [cb _delete %W]
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return $this
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}
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method ensure_canvas {} {
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if {[winfo exists $w_c]} {
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$w_c coords bar 0 0 0 20
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} else {
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canvas $w_c \
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-height [expr {int([winfo reqheight $w_l] * 0.6)}] \
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-borderwidth 1 \
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-relief groove \
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-highlightt 0
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$w_c create rectangle 0 0 0 20 -tags bar -fill navy
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eval $c_pack
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}
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}
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method show {msg} {
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$this ensure_canvas
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set baseline_text $msg
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$this refresh
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}
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method start {msg {uds {}}} {
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set baseline_text ""
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if {!$allow_multiple && [llength $operations]} {
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return [lindex $operations 0]
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}
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$this ensure_canvas
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set operation [status_bar_operation::new $this $msg $uds]
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lappend operations $operation
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$this refresh
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return $operation
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}
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method refresh {} {
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set new_text ""
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set total [expr $completed_operation_count * 100]
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set have $total
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foreach operation $operations {
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if {$new_text != ""} {
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append new_text " / "
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}
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append new_text [$operation get_status]
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set total [expr $total + 100]
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set have [expr $have + [$operation get_progress]]
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}
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if {$new_text == ""} {
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set new_text $baseline_text
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}
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set status_bar_text $new_text
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if {[winfo exists $w_c]} {
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set pixel_width 0
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if {$have > 0} {
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set pixel_width [expr {[winfo width $w_c] * $have / $total}]
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}
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$w_c coords bar 0 0 $pixel_width 20
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}
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}
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method stop {operation stop_msg} {
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set idx [lsearch $operations $operation]
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if {$idx >= 0} {
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set operations [lreplace $operations $idx $idx]
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set completed_operation_count [expr \
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$completed_operation_count + 1]
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if {[llength $operations] == 0} {
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set completed_operation_count 0
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destroy $w_c
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if {$stop_msg ne {}} {
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set baseline_text $stop_msg
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}
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}
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$this refresh
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}
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}
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method stop_all {{stop_msg {}}} {
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# This makes the operation's call to stop a no-op.
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set operations_copy $operations
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set operations [list]
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foreach operation $operations_copy {
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$operation stop
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}
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if {$stop_msg ne {}} {
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set baseline_text $stop_msg
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}
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$this refresh
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}
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method _delete {current} {
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if {$current eq $w} {
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delete_this
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}
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}
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}
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# The status_bar_operation class tracks a single consumer's ongoing status bar
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# activity, with the context that there are a few situations where multiple
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# overlapping asynchronous operations might want to display status information
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# simultaneously. Instances of status_bar_operation are created by calling
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# start on the status_bar, and when the caller is done with its stauts bar
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# operation, it calls stop on the operation.
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class status_bar_operation {
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field status_bar; # reference back to the status_bar that owns this object
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field is_active;
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field status {}; # single line of text we show
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field progress {}; # current progress (0 to 100)
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field prefix {}; # text we format into status
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field units {}; # unit of progress
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field meter {}; # current core git progress meter (if active)
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constructor new {owner msg uds} {
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set status_bar $owner
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set status $msg
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set progress 0
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set prefix $msg
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set units $uds
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set meter {}
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set is_active 1
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return $this
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}
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method get_is_active {} { return $is_active }
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method get_status {} { return $status }
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method get_progress {} { return $progress }
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method update {have total} {
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if {!$is_active} { return }
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set progress 0
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if {$total > 0} {
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set progress [expr {100 * $have / $total}]
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}
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set prec [string length [format %i $total]]
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set status [mc "%s ... %*i of %*i %s (%3i%%)" \
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$prefix \
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$prec $have \
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$prec $total \
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$units $progress]
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$status_bar refresh
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}
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method update_meter {buf} {
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if {!$is_active} { return }
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append meter $buf
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set r [string last "\r" $meter]
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if {$r == -1} {
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return
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}
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set prior [string range $meter 0 $r]
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set meter [string range $meter [expr {$r + 1}] end]
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set p "\\((\\d+)/(\\d+)\\)"
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if {[regexp ":\\s*\\d+% $p\(?:, done.\\s*\n|\\s*\r)\$" $prior _j a b]} {
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update $this $a $b
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} elseif {[regexp "$p\\s+done\r\$" $prior _j a b]} {
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update $this $a $b
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}
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}
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method stop {{stop_msg {}}} {
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if {$is_active} {
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set is_active 0
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$status_bar stop $this $stop_msg
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}
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}
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method restart {msg} {
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if {!$is_active} { return }
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set status $msg
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set prefix $msg
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set meter {}
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$status_bar refresh
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}
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method _delete {} {
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stop
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delete_this
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}
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}
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