@@ -0,0 +1,131 @@ |
| 1 | +module selection_mod |
| 2 | + use cell_mod |
| 3 | + use screen_mod |
| 4 | + implicit none |
| 5 | + private |
| 6 | + |
| 7 | + public :: selection_t |
| 8 | + public :: selection_start, selection_update, selection_end |
| 9 | + public :: selection_clear, selection_contains |
| 10 | + public :: selection_is_active, selection_get_bounds |
| 11 | + public :: selection_normalize |
| 12 | + |
| 13 | + type :: selection_t |
| 14 | + logical :: active = .false. |
| 15 | + logical :: selecting = .false. ! Mouse button held |
| 16 | + integer :: start_row = 0 |
| 17 | + integer :: start_col = 0 |
| 18 | + integer :: end_row = 0 |
| 19 | + integer :: end_col = 0 |
| 20 | + end type selection_t |
| 21 | + |
| 22 | +contains |
| 23 | + |
| 24 | + subroutine selection_start(sel, row, col) |
| 25 | + type(selection_t), intent(inout) :: sel |
| 26 | + integer, intent(in) :: row, col |
| 27 | + |
| 28 | + sel%start_row = row |
| 29 | + sel%start_col = col |
| 30 | + sel%end_row = row |
| 31 | + sel%end_col = col |
| 32 | + sel%selecting = .true. |
| 33 | + sel%active = .false. ! Not active until mouse moves |
| 34 | + end subroutine selection_start |
| 35 | + |
| 36 | + subroutine selection_update(sel, row, col) |
| 37 | + type(selection_t), intent(inout) :: sel |
| 38 | + integer, intent(in) :: row, col |
| 39 | + |
| 40 | + if (.not. sel%selecting) return |
| 41 | + |
| 42 | + sel%end_row = row |
| 43 | + sel%end_col = col |
| 44 | + |
| 45 | + ! Mark as active if selection spans at least one cell |
| 46 | + if (sel%start_row /= sel%end_row .or. sel%start_col /= sel%end_col) then |
| 47 | + sel%active = .true. |
| 48 | + end if |
| 49 | + end subroutine selection_update |
| 50 | + |
| 51 | + subroutine selection_end(sel) |
| 52 | + type(selection_t), intent(inout) :: sel |
| 53 | + |
| 54 | + sel%selecting = .false. |
| 55 | + ! Keep active if we have a valid selection |
| 56 | + end subroutine selection_end |
| 57 | + |
| 58 | + subroutine selection_clear(sel) |
| 59 | + type(selection_t), intent(inout) :: sel |
| 60 | + |
| 61 | + sel%active = .false. |
| 62 | + sel%selecting = .false. |
| 63 | + sel%start_row = 0 |
| 64 | + sel%start_col = 0 |
| 65 | + sel%end_row = 0 |
| 66 | + sel%end_col = 0 |
| 67 | + end subroutine selection_clear |
| 68 | + |
| 69 | + function selection_is_active(sel) result(active) |
| 70 | + type(selection_t), intent(in) :: sel |
| 71 | + logical :: active |
| 72 | + |
| 73 | + active = sel%active |
| 74 | + end function selection_is_active |
| 75 | + |
| 76 | + subroutine selection_normalize(sel, r1, c1, r2, c2) |
| 77 | + type(selection_t), intent(in) :: sel |
| 78 | + integer, intent(out) :: r1, c1, r2, c2 |
| 79 | + |
| 80 | + ! Return normalized bounds (r1,c1) <= (r2,c2) in reading order |
| 81 | + if (sel%start_row < sel%end_row .or. & |
| 82 | + (sel%start_row == sel%end_row .and. sel%start_col <= sel%end_col)) then |
| 83 | + r1 = sel%start_row |
| 84 | + c1 = sel%start_col |
| 85 | + r2 = sel%end_row |
| 86 | + c2 = sel%end_col |
| 87 | + else |
| 88 | + r1 = sel%end_row |
| 89 | + c1 = sel%end_col |
| 90 | + r2 = sel%start_row |
| 91 | + c2 = sel%start_col |
| 92 | + end if |
| 93 | + end subroutine selection_normalize |
| 94 | + |
| 95 | + subroutine selection_get_bounds(sel, r1, c1, r2, c2) |
| 96 | + type(selection_t), intent(in) :: sel |
| 97 | + integer, intent(out) :: r1, c1, r2, c2 |
| 98 | + |
| 99 | + call selection_normalize(sel, r1, c1, r2, c2) |
| 100 | + end subroutine selection_get_bounds |
| 101 | + |
| 102 | + function selection_contains(sel, row, col) result(contains) |
| 103 | + type(selection_t), intent(in) :: sel |
| 104 | + integer, intent(in) :: row, col |
| 105 | + logical :: contains |
| 106 | + integer :: r1, c1, r2, c2 |
| 107 | + |
| 108 | + contains = .false. |
| 109 | + if (.not. sel%active) return |
| 110 | + |
| 111 | + call selection_normalize(sel, r1, c1, r2, c2) |
| 112 | + |
| 113 | + ! Check if (row, col) is within selection |
| 114 | + if (row < r1 .or. row > r2) return |
| 115 | + |
| 116 | + if (r1 == r2) then |
| 117 | + ! Single line selection |
| 118 | + contains = (col >= c1 .and. col <= c2) |
| 119 | + else if (row == r1) then |
| 120 | + ! First line of multi-line selection |
| 121 | + contains = (col >= c1) |
| 122 | + else if (row == r2) then |
| 123 | + ! Last line of multi-line selection |
| 124 | + contains = (col <= c2) |
| 125 | + else |
| 126 | + ! Middle lines are fully selected |
| 127 | + contains = .true. |
| 128 | + end if |
| 129 | + end function selection_contains |
| 130 | + |
| 131 | +end module selection_mod |