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-rw-r--r--archive/1.vm/sandbox/007-sandbox-delete.mu345
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diff --git a/archive/1.vm/sandbox/007-sandbox-delete.mu b/archive/1.vm/sandbox/007-sandbox-delete.mu
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+## deleting sandboxes
+
+scenario deleting-sandboxes [
+  local-scope
+  trace-until 100/app  # trace too long
+  assume-screen 50/width, 15/height
+  assume-resources [
+  ]
+  env:&:environment <- new-programming-environment resources, screen, []
+  render-all screen, env, render
+  # run a few commands
+  assume-console [
+    type [divide-with-remainder 11, 3]
+    press F4
+    type [add 2, 2]
+    press F4
+  ]
+  event-loop screen, console, env, resources
+  screen-should-contain [
+    .                               run (F4)           .
+    .                                                  .
+    .──────────────────────────────────────────────────.
+    .0   edit           copy           delete          .
+    .add 2, 2                                          .
+    .4                                                 .
+    .──────────────────────────────────────────────────.
+    .1   edit           copy           delete          .
+    .divide-with-remainder 11, 3                       .
+    .3                                                 .
+    .2                                                 .
+    .──────────────────────────────────────────────────.
+    .                                                  .
+  ]
+  # delete second sandbox by clicking on left edge of 'delete' button
+  assume-console [
+    left-click 7, 34
+  ]
+  run [
+    event-loop screen, console, env, resources
+  ]
+  screen-should-contain [
+    .                               run (F4)           .
+    .                                                  .
+    .──────────────────────────────────────────────────.
+    .0   edit           copy           delete          .
+    .add 2, 2                                          .
+    .4                                                 .
+    .──────────────────────────────────────────────────.
+    .                                                  .
+  ]
+  # delete first sandbox by clicking at right edge of 'delete' button
+  assume-console [
+    left-click 3, 49
+  ]
+  run [
+    event-loop screen, console, env, resources
+  ]
+  screen-should-contain [
+    .                               run (F4)           .
+    .                                                  .
+    .──────────────────────────────────────────────────.
+    .                                                  .
+  ]
+]
+
+after <global-touch> [
+  # support 'delete' button
+  {
+    delete?:bool <- should-attempt-delete? click-row, click-column, env
+    break-unless delete?
+    delete?, env <- try-delete-sandbox click-row, env
+    break-unless delete?
+    screen <- render-sandbox-side screen, env, render
+    screen <- update-cursor screen, current-sandbox, env
+    loop +next-event
+  }
+]
+
+# some preconditions for attempting to delete a sandbox
+def should-attempt-delete? click-row:num, click-column:num, env:&:environment -> result:bool [
+  local-scope
+  load-inputs
+  # are we below the sandbox editor?
+  click-sandbox-area?:bool <- click-on-sandbox-area? click-row, env
+  return-unless click-sandbox-area?, false
+  # narrower, is the click in the columns spanning the 'copy' button?
+  first-sandbox:&:editor <- get *env, current-sandbox:offset
+  assert first-sandbox, [!!]
+  sandbox-left-margin:num <- get *first-sandbox, left:offset
+  sandbox-right-margin:num <- get *first-sandbox, right:offset
+  _, _, _, _, delete-button-left:num <- sandbox-menu-columns sandbox-left-margin, sandbox-right-margin
+  result <- within-range? click-column, delete-button-left, sandbox-right-margin
+]
+
+def try-delete-sandbox click-row:num, env:&:environment -> clicked-on-delete-button?:bool, env:&:environment [
+  local-scope
+  load-inputs
+  # identify the sandbox to delete, if the click was actually on the 'delete' button
+  sandbox:&:sandbox <- find-sandbox env, click-row
+  return-unless sandbox, false
+  clicked-on-delete-button? <- copy true
+  env <- delete-sandbox env, sandbox
+]
+
+def delete-sandbox env:&:environment, sandbox:&:sandbox -> env:&:environment [
+  local-scope
+  load-inputs
+  curr-sandbox:&:sandbox <- get *env, sandbox:offset
+  first-sandbox?:bool <- equal curr-sandbox, sandbox
+  {
+    # first sandbox? pop
+    break-unless first-sandbox?
+    next-sandbox:&:sandbox <- get *curr-sandbox, next-sandbox:offset
+    *env <- put *env, sandbox:offset, next-sandbox
+  }
+  {
+    # not first sandbox?
+    break-if first-sandbox?
+    prev-sandbox:&:sandbox <- copy curr-sandbox
+    curr-sandbox <- get *curr-sandbox, next-sandbox:offset
+    {
+      assert curr-sandbox, [sandbox not found! something is wrong.]
+      found?:bool <- equal curr-sandbox, sandbox
+      break-if found?
+      prev-sandbox <- copy curr-sandbox
+      curr-sandbox <- get *curr-sandbox, next-sandbox:offset
+      loop
+    }
+    # snip sandbox out of its list
+    next-sandbox:&:sandbox <- get *curr-sandbox, next-sandbox:offset
+    *prev-sandbox <- put *prev-sandbox, next-sandbox:offset, next-sandbox
+  }
+  # update sandbox count
+  sandbox-count:num <- get *env, number-of-sandboxes:offset
+  sandbox-count <- subtract sandbox-count, 1
+  *env <- put *env, number-of-sandboxes:offset, sandbox-count
+  # reset scroll if deleted sandbox was last
+  {
+    break-if next-sandbox
+    render-from:num <- get *env, render-from:offset
+    reset-scroll?:bool <- equal render-from, sandbox-count
+    break-unless reset-scroll?
+    *env <- put *env, render-from:offset, -1
+  }
+]
+
+scenario deleting-sandbox-after-scroll [
+  local-scope
+  trace-until 100/app  # trace too long
+  assume-screen 50/width, 10/height
+  # initialize environment
+  assume-resources [
+  ]
+  env:&:environment <- new-programming-environment resources, screen, []
+  render-all screen, env, render
+  # create 2 sandboxes and scroll to second
+  assume-console [
+    press ctrl-n
+    type [add 2, 2]
+    press F4
+    type [add 1, 1]
+    press F4
+    press page-down
+  ]
+  event-loop screen, console, env, resources
+  screen-should-contain [
+    .                               run (F4)           .
+    .──────────────────────────────────────────────────.
+    .0   edit           copy           delete          .
+    .add 1, 1                                          .
+    .2                                                 .
+    .──────────────────────────────────────────────────.
+    .1   edit           copy           delete          .
+    .add 2, 2                                          .
+    .4                                                 .
+    .──────────────────────────────────────────────────.
+  ]
+  # delete the second sandbox
+  assume-console [
+    left-click 6, 34
+  ]
+  run [
+    event-loop screen, console, env, resources
+  ]
+  # second sandbox shows in editor; scroll resets to display first sandbox
+  screen-should-contain [
+    .                               run (F4)           .
+    .──────────────────────────────────────────────────.
+    .0   edit           copy           delete          .
+    .add 1, 1                                          .
+    .2                                                 .
+    .──────────────────────────────────────────────────.
+    .                                                  .
+  ]
+]
+
+scenario deleting-top-sandbox-after-scroll [
+  local-scope
+  trace-until 100/app  # trace too long
+  assume-screen 50/width, 10/height
+  # initialize environment
+  assume-resources [
+  ]
+  env:&:environment <- new-programming-environment resources, screen, []
+  render-all screen, env, render
+  # create 2 sandboxes and scroll to second
+  assume-console [
+    press ctrl-n
+    type [add 2, 2]
+    press F4
+    type [add 1, 1]
+    press F4
+    press page-down
+  ]
+  event-loop screen, console, env, resources
+  screen-should-contain [
+    .                               run (F4)           .
+    .──────────────────────────────────────────────────.
+    .0   edit           copy           delete          .
+    .add 1, 1                                          .
+    .2                                                 .
+    .──────────────────────────────────────────────────.
+    .1   edit           copy           delete          .
+    .add 2, 2                                          .
+    .4                                                 .
+    .──────────────────────────────────────────────────.
+  ]
+  # delete the second sandbox
+  assume-console [
+    left-click 2, 34
+  ]
+  run [
+    event-loop screen, console, env, resources
+  ]
+  # second sandbox shows in editor; scroll resets to display first sandbox
+  screen-should-contain [
+    .                               run (F4)           .
+    .──────────────────────────────────────────────────.
+    .0   edit           copy           delete          .
+    .add 2, 2                                          .
+    .4                                                 .
+    .──────────────────────────────────────────────────.
+    .                                                  .
+  ]
+]
+
+scenario deleting-final-sandbox-after-scroll [
+  local-scope
+  trace-until 100/app  # trace too long
+  assume-screen 50/width, 10/height
+  # initialize environment
+  assume-resources [
+  ]
+  env:&:environment <- new-programming-environment resources, screen, []
+  render-all screen, env, render
+  # create 2 sandboxes and scroll to second
+  assume-console [
+    press ctrl-n
+    type [add 2, 2]
+    press F4
+    type [add 1, 1]
+    press F4
+    press page-down
+    press page-down
+  ]
+  event-loop screen, console, env, resources
+  screen-should-contain [
+    .                               run (F4)           .
+    .──────────────────────────────────────────────────.
+    .1   edit           copy           delete          .
+    .add 2, 2                                          .
+    .4                                                 .
+    .──────────────────────────────────────────────────.
+    .                                                  .
+  ]
+  # delete the second sandbox
+  assume-console [
+    left-click 2, 34
+  ]
+  run [
+    event-loop screen, console, env, resources
+  ]
+  # implicitly scroll up to first sandbox
+  screen-should-contain [
+    .                               run (F4)           .
+    .                                                  .
+    .──────────────────────────────────────────────────.
+    .0   edit           copy           delete          .
+    .add 1, 1                                          .
+    .2                                                 .
+    .──────────────────────────────────────────────────.
+    .                                                  .
+  ]
+]
+
+scenario deleting-updates-sandbox-count [
+  local-scope
+  trace-until 100/app  # trace too long
+  assume-screen 50/width, 10/height
+  # initialize environment
+  assume-resources [
+  ]
+  env:&:environment <- new-programming-environment resources, screen, []
+  render-all screen, env, render
+  # create 2 sandboxes
+  assume-console [
+    press ctrl-n
+    type [add 2, 2]
+    press F4
+    type [add 1, 1]
+    press F4
+  ]
+  event-loop screen, console, env, resources
+  screen-should-contain [
+    .                               run (F4)           .
+    .                                                  .
+    .──────────────────────────────────────────────────.
+    .0   edit           copy           delete          .
+    .add 1, 1                                          .
+    .2                                                 .
+    .──────────────────────────────────────────────────.
+    .1   edit           copy           delete          .
+    .add 2, 2                                          .
+    .4                                                 .
+  ]
+  # delete the second sandbox, then try to scroll down twice
+  assume-console [
+    left-click 3, 34
+    press page-down
+    press page-down
+  ]
+  run [
+    event-loop screen, console, env, resources
+  ]
+  # shouldn't go past last sandbox
+  screen-should-contain [
+    .                               run (F4)           .
+    .──────────────────────────────────────────────────.
+    .0   edit           copy           delete          .
+    .add 2, 2                                          .
+    .4                                                 .
+    .──────────────────────────────────────────────────.
+    .                                                  .
+  ]
+]