Name

Type

Optional

Meaning

ControlName

String

Yes

Optional name for the control.

This name must be globally unique, and is used to create a global variable to be used with control name methods and properties.

hwnd

Number

No

Handle of the dialog containing the control

ctrlID

Number

No

Control identifier

txt

String

No

A text expression representing the text you want to assign to the control.

xPos

Number

No

Horizontal position of the control inside the dialog

yPos

Number

No

Vertical position of the control inside the dialog

Width

Number

No

Control width

Height

Number

No

Control height

Style

Number

Yes

Optional primary style of the canvas control.

This value can be a combination of the values below, combined together with the OR operator to form a bitmask. If style is omitted, the default combination is:

%WS_CHILD OR %WS_VISIBLE OR %SS_OWNERDRAW.

%SS_NOTIFY

Send %STN_CLICKED and %STN_DBLCLK notification messages to the Callback Function when the user clicks or double-clicks the control.

%SS_SUNKEN

Draw a half-sunken border around the graphic control.

%WS_BORDER

Add a thin line border around the graphic control.

%WS_DLGFRAME

Create a graphic control that has a border of the style typically used with dialog boxes.

ExStyle

Number

Yes

Optional extended style of the Canvas control.

This value can be a combination of the values below, combined together with the OR operator to form a bitmask. If exstyle is omitted, there is no default extended style.

%WS_EX_CLIENTEDGE

Apply a sunken edge border to the control.

%WS_EX_STATICEDGE

Apply a three-dimensional border style to the control (intended to be used for items that do not accept user input).

CallBack

Function

Yes

Optional name of a Callback Function that receives all %WM_COMMAND and %WM_NOTIFY messages for the control.

If a callback for the control is not designated, you must create a dialog Callback Function to process messages from your control.

If the Callback Function processes a message, it should return %TRUE (non-zero) to prevent the message being passed unnecessarily to the dialog callback (if one exists). The dialog callback should also return %TRUE if the notification message is processed by that Callback Function.