vb net mouse right click event display menu

#Vb net mouse right click event display menu code
#Vb net mouse right click event display menu series

The top-level button has one or more child widget buttons attached.

The topmost element of any pulldown menu is a button, created with the MENU keyword to the WIDGET_BUTTON function.

The method for creating a pulldown menu is as follows:

Buttons in such a pulldown menu can activate other pulldown menus to any desired depth. Values = base = WIDGET_BASE(/ROW) list = WIDGET_LIST(base, VALUE=values, YSIZE= 3) drop = WIDGET_DROPLIST(base, VALUE=values) WIDGET_CONTROL, base, /REALIZEĪ third approach to menu creation involves menus that appear as a single button until the user selects the menu, at which time the menu pops up to display the list of possible selections. While both lists contain five items, the scrolling list displays only three at a time, because we specify this with the YSIZE keyword.

The following example code uses the WIDGET_LIST and WIDGET_DROPLIST functions to create two menus of five items each. Both lists allow only a single selection at a time. A drop-down list shows only the selected item until the user clicks on the list, at which time it displays the entire list. A scrolling list is always displayed, although it may not show all items in the list at all times. The widget created by this code is shown in the following figure:Ī second approach to menu creation is to provide the user with a list of options in the form of a scrolling or drop-down list. values = base = WIDGET_BASE(/ROW) bgroup1 = CW_BGROUP(base, values, /COLUMN, $ LABEL_TOP= 'Normal', /FRAME) bgroup2 = CW_BGROUP(base, values, /COLUMN, /EXCLUSIVE, $ LABEL_TOP= 'Exclusive', /FRAME) bgroup3 = CW_BGROUP(base, values, /COLUMN, /NONEXCLUSIVE, $ LABEL_TOP= 'Nonexclusive', /FRAME) WIDGET_CONTROL, base, /REALIZE The next is an exclusive group, and the third is a non-exclusive group. The first group is a “normal” button group as created in the previous example. The following code creates three button groups. Clicking on the same button repeatedly selects and deselects that button. Non-exclusive button groups allow any number of buttons to be selected at the same time. Clicking on an unselected button deselects any previously-selected buttons. In contrast to normal button groups, both exclusive and non-exclusive groups display which buttons have been selected.Įxclusive button groups allow only one button to be selected at a given time. Groups of buttons can also be made to act in concert, as either exclusive or non-exclusive groups.

Exclusive or Nonexclusive Buttonsīuttons in button groups normally act as independent entities, returning a selection event (a one in the select field of the event structure) or similar value when pressed. In this example, one call to CW_BGROUP replaces five calls to WIDGET_BUTTON.

For example, the following IDL statements create a button menu with five choices: values = base = WIDGET_BASE() bgroup = CW_BGROUP(base, values, /COLUMN) WIDGET_CONTROL, base, /REALIZE

Using CW_BGROUP rather than a series of calls to WIDGET_BUTTON simplifies creation of a menu of buttons and also simplifies event handling by providing a single event structure for the group of buttons.

Call the WIDGET_BUTTON function once for each button to be added to the base created in the previous step.īecause menus of buttons are common, IDL provides a compound widget named CW_BGROUP to create them.

Use the COLUMN and ROW keywords to determine the layout of the buttons.

Call the WIDGET_BASE function to create a base to hold the buttons.

To create a button menu, do the following:

With a button menu, all options are visible to the user all the time. One approach to menu creation is to build an array of buttons. This section discusses the following different types of menus: IDL widgets allow you to build a number of different types of menus for your widget application. Menus allow a user to select one or more options from a list of options.

#Vb net mouse right click event display menu code

#Vb net mouse right click event display menu series