| Rev | Line | |
|---|
| [175] | 1 | # scroll_canvas.tcl --
|
|---|
| 2 | # Experiment with scrolling canvas items selectively
|
|---|
| 3 | #
|
|---|
| 4 |
|
|---|
| 5 | canvas .c -width 400 -height 200
|
|---|
| 6 | scrollbar .y -command scrollc
|
|---|
| 7 |
|
|---|
| 8 | grid .c .y -sticky news
|
|---|
| 9 |
|
|---|
| 10 | .c create text 200 10 -text "Title"
|
|---|
| 11 | .c lower [.c create rectangle 0 0 400 30 -fill white -outline {} ]
|
|---|
| 12 |
|
|---|
| 13 | .c lower [.c create text 10 50 -text "Item" -anchor w -tag Move]
|
|---|
| 14 | .c lower [.c create polygon 80 50 140 50 140 350 -fill green -tag Move]
|
|---|
| 15 |
|
|---|
| 16 | # Set the parameters for the scrollbar
|
|---|
| 17 | .y set 0.0 0.5
|
|---|
| 18 | set currentPos 0.0
|
|---|
| 19 |
|
|---|
| 20 | proc scrollc {operation number {unit ""}} {
|
|---|
| 21 | # Ignore scroll operation
|
|---|
| 22 | if { $operation == "moveto" } {
|
|---|
| 23 | set dely [expr {400*($::currentPos-$number)}]
|
|---|
| 24 | set ::currentPos $number
|
|---|
| 25 | .c move Move 0 $dely
|
|---|
| 26 | }
|
|---|
| 27 | }
|
|---|
Note:
See
TracBrowser
for help on using the repository browser.
