Inheritance diagram for DisplayScreen:

Public Slots
void	blink ()
	DisplayScreen::blink - blink the display.

void	cursorBlink ()
	DisplayScreen::cursorBlink - blink the cursor.

void	setCursorColour (bool inherit)
	DisplayScreen::setCursorColour - set the cursor colour.

void	copyText ()
	DisplayScreen::copyText - copy the text within the rubberband to the clipboard.

void	moveCursor (int x, int y)
	DisplayScreen::moveCursor - move the cursor.

void	deleteChar ()
	DisplayScreen::deleteChar - delete the character at the specified position.

void	newline ()
	DisplayScreen::newline - move the cursor to the first input field after the current line.

void	tab (int offset)
	DisplayScreen::tab - tab to the next field.

void	backtab ()
	DisplayScreen::backtab - back to the previous field start.

void	home ()
	DisplayScreen::home - move the cursor to the first field on the screen.

void	backspace ()
	DisplayScreen::backspace - backspace one character.

void	eraseEOF ()
	DisplayScreen::eraseEOF - clear the Cells starting at pos until the end of the field.

void	endline ()
	DisplayScreen::endline - move the cursor to the end of the current input field.

void	processAID (int aid, bool shortread)
	DisplayScreen::processAID - process an attention key.

void	interruptProcess ()
	ProcessDataStream::interruptProcess - interrupt the current process.

Signals
void	bufferReady (QByteArray &buffer)

void	cursorMoved (int x, int y)

Public Member Functions
	DisplayScreen (int screen_x, int screen_y, CodePage &cp, const Colours *palette)
	DisplayScreen::DisplayScreen - the 3270 display matrix, representing primary or alternate screens.

	~DisplayScreen ()
	DisplayScreen::~DisplayScreen.

void	mousePressEvent (QGraphicsSceneMouseEvent *mEvent) override
	DisplayScreen::mousePressEvent - process a mouse event.

void	mouseMoveEvent (QGraphicsSceneMouseEvent *mEvent) override
	DisplayScreen::mouseMoveEvent - process a mouse move event.

void	mouseReleaseEvent (QGraphicsSceneMouseEvent *mEvent) override
	DisplayScreen::mouseReleaseEvent - process a mouse release event.

QRectF	boundingRect () const override

void	paint (QPainter p, const QStyleOptionGraphicsItem , QWidget *) override

int	width () const
	DisplayScreen::width - return the width of the screen.

int	height () const
	DisplayScreen::height - return the height the screen.

qreal	gridWidth () const

qreal	gridHeight () const

void	setSize (const int x, const int y)

void	setChar (int pos, uchar c, bool fromKB)
	DisplayScreen::setChar - place a character on the screen.

void	setCharAttr (unsigned char c, unsigned char d)
	DisplayScreen::setCharAttr - set character attributes.

void	resetExtendedHilite (int pos)
	DisplayScreen::resetExtendedHilite - reset the extended highlighting.

void	resetExtended (int pos)
	DisplayScreen::resetExtended - reset extended attributes ready for a Start Field Extended.

void	resetCharAttr ()
	DisplayScreen::resetCharAttr - set character attributes to default.

void	resetColours ()
	DisplayScreen::resetColours - set the colours of each cell.

void	resetMDTs ()
	DisplayScreen::resetMDTs - reset all the MDTs on the screen.

void	setExtendedColour (int pos, bool foreground, unsigned char c)
	DisplayScreen::setExtendedColour - set the extended colour attributes.

void	setExtendedBlink (int pos)
	DisplayScreen::setExtendedBlink - switch blink on.

void	setExtendedReverse (int pos)
	DisplayScreen::setExtendedReverse - switch reverse on.

void	setExtendedUscore (int pos)
	DisplayScreen::setExtendedUscore - switch underscore on.

void	setField (int pos, unsigned char c, bool sfe)
	DisplayScreen::setField - Start Field or Start Field Extended.

void	setGraphicEscape ()
	DisplayScreen::setGraphicEscape - indicate that the next character is a graphic one.

void	getModifiedFields (QByteArray &buffer)
	DisplayScreen::getModifiedFields - extract all modified fields from the screen.

int	findNextUnprotectedField (int pos)
	DisplayScreen::findNextUnprotectedField - find the next unprotected field.

int	findPrevUnprotectedField (int pos)
	DisplayScreen::findPrevUnprotectedField - find the previous unprotected field.

bool	insertChar (unsigned char c, bool insertMode)
	DisplayScreen::insertChar - Inserts or overwrites the character at the specified position.

void	eraseUnprotected (int start, int end, Q3270::EraseResetMDT resetMDT)
	DisplayScreen::eraseUnprotected - erase unprotected fields between addresses.

void	setCursor (const int x, const int y)
	DisplayScreen::setCursor - position cursor.

void	setCursor (int pos)
	DisplayScreen::setCursor - position cursor.

void	showCursor ()
	DisplayScreen::showCursor - display cursor.

void	cascadeAttrs (int startpos)
	DisplayScreen::cascadeAttrs - cascade a field attribute to the cells in the field.

bool	isAskip (int pos) const
	DisplayScreen::isAskip - does this Cell have autoskip enabled.

bool	isProtected (int pos) const
	DisplayScreen::isProtected - is this Cell protected?

bool	isFieldStart (int pos) const
	DisplayScreen::isFieldStart - is this Cell a Field Start.

void	clear ()
	DisplayScreen::clear - clear the screen.

void	setFont (const QFont &font)
	DisplayScreen::setFont - change the font on the screen.

void	setFontTweak (const Q3270::FontTweak f)
	DisplayScreen::setFontTweak - change the way zero is displayed.

void	toggleRuler ()
	DisplayScreen::toggleRuler - toggle the ruler on or off.

void	setRuler ()
	DisplayScreen::setRuler - set the ruler style and redraw it in case it needs to move.

void	rulerMode (bool on)
	DisplayScreen::rulerMode - display/hide the ruler.

void	setRulerStyle (Q3270::RulerStyle rulerStyle)
	DisplayScreen::setRulerStyle - change ruler style.

void	getScreen (QByteArray &buffer)
	DisplayScreen::getScreen - place the screen buffer into the 3270 data stream.

void	readBuffer ()

void	addPosToBuffer (QByteArray &buffer, int pos)
	DisplayScreen::addPosToBuffer - insert 'pos' into 'buffer' as two bytes, doubling 0xFF if needed.

void	dumpFields ()
	DisplayScreen::dumpFields - debug routine to print out all fields.

void	dumpDisplay ()
	DisplayScreen::dumpDisplay - print out a debug replication of the screen.

void	dumpInfo ()
	DisplayScreen::dumpInfo - display information about the Cell at pos.

Constructor & Destructor Documentation

◆ DisplayScreen()

DisplayScreen::DisplayScreen	(	int	screen_x,
		int	screen_y,
		CodePage &	cp,
		const Colours *	palette
	)

explicit

DisplayScreen::DisplayScreen - the 3270 display matrix, representing primary or alternate screens.

Parameters

screen_x	- the width of the screen
screen_y	- the height of the screen
cp	- the codepage being used
palette	- the colour theme being used

DisplayScreen manages the 3270 display matrix. It is responsible for placing characters on the screen and for managing fields, graphic escape, attributes and so on.

The screen is defined as a width x height area. Each cell within that area is CELL_WIDTH by CELL_HEIGHT. This is a 4:3 ratio akin to the original 3270 screens; scaled by Qt as required.

DisplayScreen also handles the crosshairs (the ruler, which tracks where the cursor is), and the rubberband for selecting, copying and pasting sections of the screen.

◆ ~DisplayScreen()

DisplayScreen::~DisplayScreen ( )

DisplayScreen::~DisplayScreen.

Not sure we need this!

Member Function Documentation

◆ addPosToBuffer()

void DisplayScreen::addPosToBuffer	(	QByteArray &	buffer,
		int	pos
	)

DisplayScreen::addPosToBuffer - insert 'pos' into 'buffer' as two bytes, doubling 0xFF if needed.

Parameters

buffer	- QByteArray to append pos into
pos	- screen position

Adds the screen position pos into the buffer. The 3270 datastream uses 0xFF as an control byte so any actual 0xFF bytes are doubled - a 0xFF 0xFF sequence in the stream indicates a single 0xFF byte.

◆ backspace

void DisplayScreen::backspace ( )

slot

DisplayScreen::backspace - backspace one character.

Backspace one character, stopping at the field start

◆ backtab

void DisplayScreen::backtab ( )

slot

DisplayScreen::backtab - back to the previous field start.

Move the cursor to the start of the previous field (which may be this field)

◆ blink

void DisplayScreen::blink ( )

slot

DisplayScreen::blink - blink the display.

Called by a timer in Terminal to blink any characters that have blink enabled

◆ cascadeAttrs()

void DisplayScreen::cascadeAttrs ( int pos )

DisplayScreen::cascadeAttrs - cascade a field attribute to the cells in the field.

Parameters

pos	- the position of the field

When a field is set on the display, all the character cells following it inherit the field attributes. This routine copies the field attributes to the cells in the field until the next field start.

◆ clear()

void DisplayScreen::clear ( )

DisplayScreen::clear - clear the screen.

clear is called at first 'power on', when the EW or EWA commands are received, and also when the user presses the Clear button.

All fields are wiped, all attributes are reset and the display is filled with nulls.

◆ copyText

void DisplayScreen::copyText ( )

slot

DisplayScreen::copyText - copy the text within the rubberband to the clipboard.

Called when the user invokes the Copy function (default Ctrl-C) to copy the text contained within the rubberband region to the clipboard. Each new line within the rubberband generates a newline on the clipboard.

◆ cursorBlink

void DisplayScreen::cursorBlink ( )

slot

DisplayScreen::cursorBlink - blink the cursor.

Called by a timer in Terminal to blink the cursor

◆ deleteChar

void DisplayScreen::deleteChar ( )

slot

DisplayScreen::deleteChar - delete the character at the specified position.

Parameters

pos	- screen position

deleteChar is used when deleting a character from the keyboard. The characters to the right of the Cell at pos are shifted left by one character, and a null inserted at the end of the field.

◆ dumpDisplay()

void DisplayScreen::dumpDisplay ( )

DisplayScreen::dumpDisplay - print out a debug replication of the screen.

Used to debug screen layout

◆ dumpFields()

void DisplayScreen::dumpFields ( )

DisplayScreen::dumpFields - debug routine to print out all fields.

Used to debug where fields are on the screen.

◆ dumpInfo()

void DisplayScreen::dumpInfo ( )

DisplayScreen::dumpInfo - display information about the Cell at pos.

Used to display information about the Cell at pos. Mapped to Ctrl-I.

◆ endline

void DisplayScreen::endline ( )

slot

DisplayScreen::endline - move the cursor to the end of the current input field.

Move the cursor to the end of the text in the current input field.

◆ eraseEOF

void DisplayScreen::eraseEOF ( )

slot

DisplayScreen::eraseEOF - clear the Cells starting at pos until the end of the field.

Parameters

pos	- screen position

eraseEOF is used when the Erase EOF function is used from the keyboard. The field that Cell is in is set to null, starting at position pos until the end of the field.

◆ eraseUnprotected()

void DisplayScreen::eraseUnprotected	(	int	start,
		int	end,
		Q3270::EraseResetMDT	resetMDT
	)

DisplayScreen::eraseUnprotected - erase unprotected fields between addresses.

Parameters

start	- screen position
end	- screen position

eraseUnprotected is called when the EUA (Erase Unprotected to Address) order is encountered in the 3270 data stream. All unprotected fields between the specified positions are set to nulls.

◆ findNextUnprotectedField()

int DisplayScreen::findNextUnprotectedField ( int pos )

DisplayScreen::findNextUnprotectedField - find the next unprotected field.

Parameters

pos	- screen position

Returns: Field Start of the next unprotected field

Find the next field that is unprotected. This incorporates two field start attributes next to each other - field start attributes are protected, so with two adjacent Field Starts, the first cannot be an unprotected field. Used by tab, home, and the PT order.

◆ findPrevUnprotectedField()

int DisplayScreen::findPrevUnprotectedField ( int pos )

DisplayScreen::findPrevUnprotectedField - find the previous unprotected field.

Parameters

pos	- screen position

Returns: Field Start of the previous unprotected field.

Find the previous field that is unprotected. This incorporates two field start attributes next to each other - field start attributes are protected, so with two adjacent Field Starts, the first cannot be an unprotected field.

◆ getModifiedFields()

void DisplayScreen::getModifiedFields ( QByteArray & buffer )

DisplayScreen::getModifiedFields - extract all modified fields from the screen.

Parameters

buffer - address of a QByteArray to which the modified fields are appended

Locate all modified fields (MDT tags are set) and add them to the provided buffer.

◆ getScreen()

void DisplayScreen::getScreen ( QByteArray & buffer )

DisplayScreen::getScreen - place the screen buffer into the 3270 data stream.

Parameters

buffer - buffer to add the screen to

The 3270 command Read Buffer (RB) causes the screen contents to be returned to the host. getScreen extracts the screen status and adds it to buffer.

◆ height()

int DisplayScreen::height ( ) const

DisplayScreen::height - return the height the screen.

Returns: the height passed to the constructor

width is called to extract the vertical size of the screen. It is used by the Read Partition (Query) structure field which responds to the host with the capabilities of the terminal.

◆ home

void DisplayScreen::home ( )

slot

DisplayScreen::home - move the cursor to the first field on the screen.

Move the cursor to the first field on the screen; searching starts at the very last position in case that is a field start, and the first position is not.

◆ insertChar()

bool DisplayScreen::insertChar	(	unsigned char	c,
		bool	insertMode
	)

DisplayScreen::insertChar - Inserts or overwrites the character at the specified position.

Parameters

c	- character to be inserted
insertMode	- true for insert, false for overtype

Returns: true if insert was successful, false if field protected or not enough space for insert mode

insertChar is used when a character is entered from the keyboard. if Insert mode is on, the existing characters to the right of the Cell at pos are shifted right by one Cell if there is a space or a null at the end. The character is then inserted into the space at pos.

If there isn't enough space, insertChar returns false, otherwise it returns true.

TODO:

Insert only works when there is a null character in the field. If the field contains spaces, they don't count as nulls. The code below searches for the first null in the field, allowing the insert to happen only if it finds one.

There is some initial code here to check the last character of a field to see if it's a space or a null (in which case, the insert could succeed).

x3270 has an option for 'blank fill' which allows a space at the end of field to be lost when inserting characters; otherwise there must be a null.

What happens when there is a null in the middle of a field, but characters to the right? Theoretically, when an insert operation happens, the characters to the right of the insert point are moved to occupy the null (which is lost) and the characters to the right of the null remain in situ. This might be overthinking it!

Perhaps this should be broken into two tests - if the last char is a null, insert; If the option to 'blank fill' is enabled, if the last char is a space, insert otherwise it's overflow.

◆ interruptProcess

void DisplayScreen::interruptProcess ( )

slot

ProcessDataStream::interruptProcess - interrupt the current process.

This is processing for ATTN

◆ isAskip()

bool DisplayScreen::isAskip ( int pos ) const

DisplayScreen::isAskip - does this Cell have autoskip enabled.

Parameters

pos	- screen position

Returns: true if autoskip is on, false otherwise

isAskip returns a boolean indicating whether the supplied screen position contains autoskip.

◆ isFieldStart()

bool DisplayScreen::isFieldStart ( int pos ) const

DisplayScreen::isFieldStart - is this Cell a Field Start.

Parameters

pos	- screen position

Returns: true for a Field Start, false otherwise

isFieldStart returns true if the Cell is a Field Start

◆ isProtected()

bool DisplayScreen::isProtected ( int pos ) const

DisplayScreen::isProtected - is this Cell protected?

Parameters

pos	- screen position

Returns: true if protected, false otherwise

isProtected returns true if the Cell is protected.

◆ mouseMoveEvent()

void DisplayScreen::mouseMoveEvent ( QGraphicsSceneMouseEvent * mEvent )

override

DisplayScreen::mouseMoveEvent - process a mouse move event.

Parameters

mEvent - the event

Called when the mouse is moved after a click. This routine calculates the Cells around which the rubberband is to be drawn and then makes it visible.

◆ mousePressEvent()

void DisplayScreen::mousePressEvent ( QGraphicsSceneMouseEvent * mEvent )

override

DisplayScreen::mousePressEvent - process a mouse event.

Parameters

mEvent - the event

Called when a mouse event happens in DisplayScreen. This routine handles a left-click, and stores the coordinates of the click. The Rubberband is hidden (it will be shown if the mouse is moved).

◆ mouseReleaseEvent()

void DisplayScreen::mouseReleaseEvent ( QGraphicsSceneMouseEvent * mEvent )

override

DisplayScreen::mouseReleaseEvent - process a mouse release event.

Parameters

mEvent - the event

Called when the left mouse button is released. If the mouse button was released without moving the mouse, the rubberband will be invisible, and this is interpreted as the user wishing to move the cursor by clicking somewhere in the display.

◆ moveCursor

void DisplayScreen::moveCursor	(	int	x,
		int	y
	)

slot

DisplayScreen::moveCursor - move the cursor.

Parameters

x	- x position to move the cursor to
y	- y position to move the cursor to

◆ newline

void DisplayScreen::newline ( )

slot

DisplayScreen::newline - move the cursor to the first input field after the current line.

Move the cursor to the first input field found after the start of the next line.

◆ processAID

void DisplayScreen::processAID	(	int	aid,
		bool	allowShortRead
	)

slot

DisplayScreen::processAID - process an attention key.

Parameters

aid	- the key
shortRead	- true for short read, false for normal

Process an attention key. If the key was a short read key (like CLEAR, PA1 etc) then no fields are returned to the host.

◆ resetCharAttr()

void DisplayScreen::resetCharAttr ( )

DisplayScreen::resetCharAttr - set character attributes to default.

Character attributes are reset when another 3270 write command is sent or the Clear key is pressed.

◆ resetColours()

void DisplayScreen::resetColours ( )

DisplayScreen::resetColours - set the colours of each cell.

resetColours updates each cell with the modified colour palette. This is called when the user has changed the colour palette.

◆ resetExtended()

void DisplayScreen::resetExtended ( int pos )

DisplayScreen::resetExtended - reset extended attributes ready for a Start Field Extended.

Parameters

pos	- the field position

When a SFE order is encountered, there is no way to know which attributes will be set in the extended attribute pairs that follow the SFE, so this routine makes sure that any existing attribute settings are cleared before processing the pairs.

◆ resetExtendedHilite()

void DisplayScreen::resetExtendedHilite ( int pos )

DisplayScreen::resetExtendedHilite - reset the extended highlighting.

Parameters

pos	- the position on screen

Extended attribute pairs may set the highlighting to default or reset it. In both cases, this routine is used to switch off any existing highlighting.

◆ resetMDTs()

void DisplayScreen::resetMDTs ( )

DisplayScreen::resetMDTs - reset all the MDTs on the screen.

Reset all MDTs in the display; it's probably faster to just loop through the entire buffer rather than calling findNextField()

◆ rulerMode()

void DisplayScreen::rulerMode ( bool on )

DisplayScreen::rulerMode - display/hide the ruler.

Parameters

on	- whether ruler is shown or not

Called when Settings changes ruler to on or off.

◆ setChar()

void DisplayScreen::setChar	(	int	pos,
		uchar	c,
		bool	fromKB
	)

DisplayScreen::setChar - place a character on the screen.

Parameters

pos	- the cell in which to place the character
c	- the character to be set
fromKB	- whether the character was generated by the keyboard

setChar is called whenever a character is to be placed on the screen. This can be either from the incoming 3270 data stream, or from the keyboard. Whichever method generated the call, any field start is removed (this can only happen from the datastream, because field starts are protected by nature). Any character attributes previously present in the cell are removed.

The field containing the character is used to determine the colour of the character, unless character attributes are in effect.

◆ setCharAttr()

void DisplayScreen::setCharAttr	(	unsigned char	extendedType,
		unsigned char	extendedValue
	)

DisplayScreen::setCharAttr - set character attributes.

Parameters

extendedType	- the character attribute to set
extendedValue	- the value

setCharAttr is called when the SA order is encountered in the 3270 data stream. SA orders set the character attributes for the next characters placed on the screen until one of the conditions turns them off.

SA orders have two bytes; the attribute type, and the value.

Note: There are more character attributes than Q3270 currently supports.

◆ setCursor() [1/2]

void DisplayScreen::setCursor	(	const int	x,
		const int	y
	)

DisplayScreen::setCursor - position cursor.

Parameters

x	- screen position x
y	- screen position y

setCursor is used when the cursor is moved either by the user or by the incoming 3270 data stream.

◆ setCursor() [2/2]

void DisplayScreen::setCursor ( int cursorPos )

DisplayScreen::setCursor - position cursor.

Parameters

cursorPos - screen position

setCursor is used when the cursor is moved either by the user or by the incoming 3270 data stream.

◆ setCursorColour

void DisplayScreen::setCursorColour ( bool inherit )

slot

DisplayScreen::setCursorColour - set the cursor colour.

Parameters

inherit - whether the cursor inherits the underlying character colour

setCursorColour is called when the user changes the way the colour of the cursor is chosen. The default is for the cursor to be shown with the the colour of the Cell on which the cursor is placed, but it can be changed to be a static grey colour.

◆ setExtendedBlink()

void DisplayScreen::setExtendedBlink ( int pos )

DisplayScreen::setExtendedBlink - switch blink on.

Parameters

pos	- screen position

Set the cell at position to blink. Blink, Reverse and Underscore are mutually exclusive.

◆ setExtendedColour()

void DisplayScreen::setExtendedColour	(	int	pos,
		bool	foreground,
		unsigned char	c
	)

DisplayScreen::setExtendedColour - set the extended colour attributes.

Parameters

pos	- screen position
foreground	- foreground or background (true for foreground)
c	- the colour to set

When the extended attribute pair is a set foreground colour or set background colour, this routine modifies the colour accordingly.

◆ setExtendedReverse()

void DisplayScreen::setExtendedReverse ( int pos )

DisplayScreen::setExtendedReverse - switch reverse on.

Parameters

pos	- screen position

Set the cell at position to reverse. Blink, Reverse and Underscore are mutually exclusive.

◆ setExtendedUscore()

void DisplayScreen::setExtendedUscore ( int pos )

DisplayScreen::setExtendedUscore - switch underscore on.

Parameters

pos	- screen position

Set the cell at position to underscore. Blink, Reverse and Underscore are mutually exclusive.

◆ setField()

void DisplayScreen::setField	(	int	pos,
		unsigned char	c,
		bool	sfe
	)

DisplayScreen::setField - Start Field or Start Field Extended.

Parameters

pos	- the position on screen
c	- the field attribute byte that controls protected, numeric and others
sfe	- true for a Start Field Extended

setField marks the beginning of a 3270 field. The Field Attribute byte takes the following form:

Bit	Function
0,1	These two bits combine to make the field attribute a valid EBCDIC character
2	Field is protected if set to 1
3	Field is numeric if set to 1
4,5	00 - Display, non-light pen detectable
	01 - Display, light pen detectable
	10 - Intensified, light pen detectable
	11 - Non-display, non light pen detectable
6	Reserved. Must be 0.
7	MDT flag. Set when a field is modified

setField characters are always displayed as nulls. When a Start Field (or SFE) is encountered, the characters following the field are modified to reflect the field attribute via the cascadeAttrs function.

◆ setFont()

void DisplayScreen::setFont ( const QFont & font )

DisplayScreen::setFont - change the font on the screen.

Parameters

font	- the new font

setFont is called when the user has changed the font that is used to display the characters on the screen. Each cell is updated with the new font.

◆ setFontTweak()

void DisplayScreen::setFontTweak ( const Q3270::FontTweak f )

DisplayScreen::setFontTweak - change the way zero is displayed.

Parameters

f	- how a zero is modified on screen

setFontTweak changes the way a zero is displayed.

◆ setGraphicEscape()

void DisplayScreen::setGraphicEscape ( )

DisplayScreen::setGraphicEscape - indicate that the next character is a graphic one.

The 3270 Graphic Escape order means that the next character is selected from the internal 0310 code page.

◆ setRuler()

void DisplayScreen::setRuler ( )

DisplayScreen::setRuler - set the ruler style and redraw it in case it needs to move.

Called by several other routines when the ruler needs to be changed or the cursor has moved.

◆ setRulerStyle()

void DisplayScreen::setRulerStyle ( Q3270::RulerStyle rulerStyle )

DisplayScreen::setRulerStyle - change ruler style.

Parameters

rulerStyle

- ruler style

   rulerStyle | Description
   ---------- | -----------
     0        | Crosshair
     1        | Vertical
     2        | Horizontal
   other      | Off

◆ showCursor()

void DisplayScreen::showCursor ( )

DisplayScreen::showCursor - display cursor.

Called when the cursor blink is switched off to ensure that the cursor doesn't remain hidden if the blink happened to be at the point the cursor was hidden.

◆ tab

void DisplayScreen::tab ( int offset )

slot

DisplayScreen::tab - tab to the next field.

Parameters

offset - offset from the current position

Move the cursor to the next input field, skipping the attribute byte.

◆ toggleRuler()

void DisplayScreen::toggleRuler ( )

DisplayScreen::toggleRuler - toggle the ruler on or off.

Called when the user switches the ruler on or off.

◆ width()

int DisplayScreen::width ( ) const

DisplayScreen::width - return the width of the screen.

Returns: the width passed to the constructor

width is called to extract the horizontal size of the screen. It is used by the Read Partition (Query) structure field which responds to the host with the capabilities of the terminal.

The documentation for this class was generated from the following files:

/home/runner/work/Q3270/Q3270/src/DisplayScreen.h
/home/runner/work/Q3270/Q3270/src/Display/DisplayScreen.cpp
/home/runner/work/Q3270/Q3270/src/Display/DisplayScreen_Cursor.cpp
/home/runner/work/Q3270/Q3270/src/Display/DisplayScreen_Mouse.cpp

Public Slots

Signals

Public Member Functions

Constructor & Destructor Documentation

◆ DisplayScreen()

◆ ~DisplayScreen()

Member Function Documentation

◆ addPosToBuffer()

◆ backspace

◆ backtab

◆ blink

◆ cascadeAttrs()

◆ clear()

◆ copyText

◆ cursorBlink

◆ deleteChar

◆ dumpDisplay()

◆ dumpFields()

◆ dumpInfo()

◆ endline

◆ eraseEOF

◆ eraseUnprotected()

◆ findNextUnprotectedField()

◆ findPrevUnprotectedField()

◆ getModifiedFields()

◆ getScreen()

◆ height()

◆ home

◆ insertChar()

◆ interruptProcess

◆ isAskip()

◆ isFieldStart()

◆ isProtected()

◆ mouseMoveEvent()

◆ mousePressEvent()

◆ mouseReleaseEvent()

◆ moveCursor

◆ newline

◆ processAID

◆ resetCharAttr()

◆ resetColours()

◆ resetExtended()

◆ resetExtendedHilite()

◆ resetMDTs()

◆ rulerMode()

◆ setChar()

◆ setCharAttr()

◆ setCursor() [1/2]

◆ setCursor() [2/2]

◆ setCursorColour

◆ setExtendedBlink()

◆ setExtendedColour()

◆ setExtendedReverse()

◆ setExtendedUscore()

◆ setField()

◆ setFont()

◆ setFontTweak()

◆ setGraphicEscape()

◆ setRuler()

◆ setRulerStyle()

◆ showCursor()

◆ tab

◆ toggleRuler()

◆ width()