Frame Object

Frame control

Description:

Frame object is a rectangular area which can have child controls.

Frame properties include interior (border, colors, font), type (text or image), child controls, supported by EZY Prolog.

Frame object has similarity with WINDOW (which is collection of GUI controls).

EZY Prolog DLL subsystem allows to define frame event handler externally (see ezy_frame_handler )

This is sample of complex GUI inside a frame

This is sample of FRAME with background image and TEXT ENTRY field on the top

Frame object can be hidden/displayed/destroyed by functional call within EZY Prolog program.

Predicate Name	Parameters
ezy_frame_caption	Get/Set frame caption
ezy_frame_handler	Set frame handler (default or external from DLL)
ezy_object_handler	Define event handler for the frame
ezy_get_object	Get child object of the frame
ezy_get_parent	Get parent of the frame object
ezy_timer_set	Set timer for the frame object

Object support predicates:

Domain declarations:

Frames declared as:

VPS_TEXT =

vps_text(STRING CAPTION, ILIST TEXT_FLAGS);

vps_image(STRING PICTURE_FILE_NAME,ILIST IMAGE_FLAGS)

Automatic code generation:

No code generation required for Frames.

Control properties:

Supported IMAGE_FLAGS:

image_original_size = 0

stretch_image = 1

Supported TEXT_FLAGS:

dtext_Expandtabs	Expands tab characters. The default number of characters per tab is eight
dtext_Externalleading	Includes the font external leading in the height of a line of text. Normally, external leading is not included in the line height
dtext_Left	Aligns text to the left
dtext_Noclip	Draws without clipping. draw_TextInRect/5 is somewhat faster when dtext_Noclip is used
dtext_NoPrefix	Turns off processing of prefix characters. Normally, draw_TextInRect/5 interprets the mnemonic & as a directive to underscore the character that follows, and the mnemonic && as a directive to print a single &. By specifying dtext_NoPrefix, this processing is turned off
dtext_Right	Aligns text to the right
dtext_SingleLine	Specifies that the text must be displayed as a single line. Carriage returns and linefeeds do not break the line.
dtext_TabStop	Sets tab stops. The default number of characters per tab is eight. The programmer can redefine the default number of characters per tab to the desired NewTabSize number ( < 256 ) by using the following expression in the flags list (instead of the dtext_TabStop flag):
dtext_Top	Specifies top-aligned text (single line only)
dtext_Vcenter	Specifies vertically centered text (single line only)
dtext_Wordbreak	Specifies word breaking. Lines are automatically broken between words if a word would extend past the edge of the rectangle specified by the Rect argument (in draw_TextInRect). A carriage return-linefeed sequence will also break the line.