ThisWindow

A data structure that provides information about the state of the system and of the current window at the time of the last event in that window.

The ThisWindow data structure provides information about the state of the system and of the current window at the time of the last event in that window.

The ThisWindow structure contains a number of fields that are reset when the current window changes. By trapping these values, the application enables the user to change the current window and later return to pick up where things were left.

If the current window is non-modal, note that the last event in the window is not necessarily the last event in the interface overall.

The fields in the ThisWindow structure are

AltKey, CtrlKey, ShiftKey, EventName, EventTag, EventType, KeyPressed, MouseClick, ScrollingKey, WindowCol, WindowHeight, WindowName, WindowNum, WindowRow, WindowState, WindowTag, WindowWidth

Syntax #1 – AltKey, CtrlKey, ShiftKey

The state of the Alt, Ctrl or Shift key at the time of the last event in the current window.

thiswindow.altkey

thiswindow.ctrlkey

thiswindow.shiftkey

Return Value

“1” ($True), or “0” ($False), character string (binary). Can be reset by an application program.

Description

The variables indicate the state of the Alt, Ctrl and Shift keys at the time of the last event in the current window.

Each variable is set to ‘1’ ($True) if the corresponding key was down when the last event in the current window occurred. Otherwise, each is set to ‘0’ ($False).

Syntax #2 – EventName

Identifies the last event that occurred in the current window.

thiswindow.eventname

One of

Break, Canceled, Click, Closed, DoubleClick, GotFocus, HangUp, LostFocus, LostFocusModified, Modified, PanicExit, Timeout, WindowFocusSwitch, or keyname

Cannot be reset by an application program.

Return Value

Character string (alpha). Can be reset by an application program.

Description

Identifies, by name, the last event to occur in the current window.

This variable is not set in all operating environments.

ThisWindow.EventType gives additional information about the type of event, and ThisWindow.EventTag gives additional information about the type of object involved in the event.

Syntax #3 – EventTag

Identifies the tag of the object in which the last event in the current window occurred.

thiswindow.eventtag

Return Value

The identification tag of the object in which the last event in the current window occurred. Can be reset by an application program.

Description

Identifies the object in which the last event in the current window occurred.

The identification tag selected varies with the type of object involved in the event.

ThisWindow.EventName names the event, and ThisWindow.EventType gives additional information about the type of event.

Can be, depending on the type of object involved

Syntax #4 – EventType

Identifies the type of event that last occurred in the current window.

thiswindow.eventtype

One of

Window, Menu, MenuItem, Form, FormField, Accelerator, System

Return Value

Character string (alpha). Can be reset by an application program.

Description

Identifies the type of event that last occurred in the current window. ThisWindow.EventName names the event, and ThisWindow.EventTag identifies the object in which the event occurred.

Syntax #5 – KeyPressed

Indicates the key that, pressed, caused the event that last occurred in the current window.

thiswindow.keypressed

Return Value

Character string (alpha). Can be reset by an application program.

Description

The name of the key that, pressed by the application user, caused the last event to occur in the current window. Can be reset by an application program.

For example, if the application user presses the a key in a form field and the Modified event is intercepted by the application program, then ThisWindow.KeyPressed is set to “a”.

Note: The name of the key that caused an accelerator event is recorded in the ThisWindow.EventName variable.

Syntax #6 – MouseClick

Indicates if a mouse button accelerator caused the event that last occurred in the current window.

thiswindow.mouseclick

Return Value

“1” ($True), or “0” ($False). Can be reset by an application program.

Description

Set to “1” ($True) if the last event to occur in the current window was caused by the press of a mouse button that is defined as an accelerator for the window. Otherwise, set to “0” ($False).

If SET MOUSE is OFF, ThisWindow.MouseClick is 0.

Syntax #7 – ScrollingKey

Indicates if the accelerator that caused the event that last occurred was also a defined SCROLL key.

thiswindow.scrollingkey

Return Value

“1” ($True), or “0” ($False). Can be reset by an application program.

Description

Set to “1” ($True) if the accelerator key that caused the last event in the current window was also a defined SCROLL key. Otherwise, set to “0” ($False).

Example

window set scroll Up up Down down
window set accelerator up down escape
form open fEmployee
form set scroll fEmployee from EmpSet
form display
while
if thiswindow.scrollingkey = $true
change EmpSet from fEmployee
form scroll
continue
endif
… other commands …
endwhile

In the preceding code fragment, employee records are scrolled through a form and the application user can update the data. ThisWindow.ScrollingKey detects if a scrolling key was pressed, enabling the scrolling action to be performed under program control after any changes to the data are saved.

Syntax #8 – ScrollingKey

thiswindow.scrollingkey

Return Value

Character string (binary). Can be reset by an applicatio
n program.

Description

The variable indicates if the accelerator that cased the event that last occurred was also a defined SCROLL key.

ThisWindow.ScrollingKey is set to ‘1’ ($True) if the accelerator that caused the last event in the current window was also a defined SCROLL key. Otherwise, it is set to ‘0’ ($False).

Syntax #9 – WindowCol, WindowRow

The character column or row position of the current window.

thiswindow.windowcol

thiswindow.windowrow

Return Value

A number. Cannot be reset by an application program.

Description

The variables indicate the physical size of the current window in character rows (WindowHeight) and character columns (WindowWidth).

The physical dimensions of a window determine the visible space inside the window (i.e., the client area). This area changes in size when the dimensions of the window change. An application user can change the size of a window by using the resize feature. A program can change the size of a window using the WINDOW SIZE command.

An application program can position a window using the WINDOW MOVE command.

Syntax #10 – WindowHeight, WindowWidth

The physical height or width of the current window in character rows.

thiswindow.windowheight

thiswindow.windowwidth

Return Value

Number (INT). Cannot be reset by an application program.

Description

The variables indicate the physical size of the current window in character rows (WindowHeight) and character columns (WindowWidth).

The physical dimensions of a window determine the visible space inside the window (i.e., the client area). This area changes in size when the dimensions of the window change. An application user can change the size of a window by using the resize feature. A program can change the size of a window using the WINDOW SIZE command.

Syntax #11 – WindowName

The name of the current window.

thiswindow.windowname

Return Value

A character string. Can be reset by an application program.

Description

The variable identifies, by name, the current window.

Example

You can use ThisWindow.WindowName to restore the focus to a window, making it the current window:

let SaveWin = ThisWindow.WindowName
window open Window2
… other commands …
window set current SaveWin

Syntax #12 – WindowNum

The identification number of the current window.

thiswindow.windownum

Return Value

A number. Can be reset by an application program.

Description

The variable identifies, by identification number, the current window.

Syntax #13 – WindowTag

thiswindow.windownum

Return Value

Character string (alpha). Can be reset by the application program.

Description

The variable identifies, by identification tag, the current window.

Syntax #13 – WindowState

Indicates whether the current window is maximized, minimized, or otherwise.

thiswindow.windownum

Return Value

A number. Cannot be reset by an application program.

Description

Indicates the state of the current window at the time of the last event in that window.

See Also

FORM INPUT

FORM SET

MENU INPUT

MENU SET

SCREEN CLEAR

SCREEN RESET

ThisForm

WINDOW SET