Gesture that lets the user resize the columns or rows of a table
by dragging the line between two cells. The gesture is attached to the
device of a table-laid-out picture; depending on resize_table_slice_gesture<-mode
it resizes columns or rows.
The press on a row/column boundary becomes a drag that sends
table->user_resize_slice to the table,
where Slice is the table_row or table_column
being resized and Size is the distance between the current
event and the slice's
resize_table_slice_gesture<-position.
A typical setup that allows the user to resize columns by dragging
their boundaries:
new(P, picture('My Table')),
send(P, layout_manager, new(_T, table)),
send(P, recogniser, resize_table_slice_gesture(column)),
- See also
- - class table
- class table_row
- class table_column
- resize_table_slice_gesture <->
mode: {column,row}
- Whether the gesture resizes columns or rows.
- resize_table_slice_gesture <-
row: int*
- Index of the row currently being resized, or @nil.
- resize_table_slice_gesture <-
column: int*
- Index of the column currently being resized, or @nil.
- resize_table_slice_gesture <->
min_size: size*
- Minimum size of the row/column; the drag is clipped so that the slice
never falls below this.
- resize_table_slice_gesture ->initialise: mode={column,row},
button=[button_name], modifier=[modifier]
- Create the gesture in column- or row-resize mode, bound to the given
button and modifier.
- resize_table_slice_gesture ->verify: event
- Succeed when the device has a
table layout manager and the
pointer is near a row/column boundary.
- resize_table_slice_gesture ->initiate: event
- Set the resize cursor and warp the pointer to the boundary.
- resize_table_slice_gesture ->drag: event
- Send table
->user_resize_slice with the new
size.
- resize_table_slice_gesture ->terminate: event
- Equivalent to resize_table_slice_gesture
->drag.
button:middle- Button on which the gesture is active.
margin_fraction:4- Pointer must be within 1/<value> of a slice's size from the
boundary to activate.
margin_width:15- Absolute pixel cap on the boundary "grab zone".
min_size:size(10,
10)- Lower bound when dragging.
