The Hpane Display Class

To move a divider, simply place the mouse pointer on it, press and hold the left mouse button, and then slide the divider left or right. A small button is provided on the bottom of each divider as a convenient place to locate the pointer.

The dividers of an hpane layout always extend from the top to the bottom of the layout, so care must be taken when using hpane layouts with more than one row. For example, in an hpane layout of the form (`a`b;`c), the divider between objects a and b will cut through object c. If several objects line up on a divider boundary, then movement of the divider controls the display sizes of these objects. If all the objects line up on divider boundaries, then movement of the dividers controls the display sizes of entire columns of objects.

There is no direct way for a program to determine where a user has positioned a divider in an hpane layout. Sometimes there are indirect ways to approximate the position, such as checking the values of the rows and cols attributes of a matrix to determine how many rows and columns are currently shown.