Aufgabe 1: Ein-/Ausgabe

Constructor of a text window.

Creates a virtual, rectangular text window on the screen. The coordinates to construct the window are absolute positions in the TextMode screen.

Note

Overlapping windows are neither supported nor prevented – better just try to avoid construction windows with overlapping coordinates!

Warning

Don't use the hardware cursor in more than one window!

Parameters

from_col	Text Window starts in column from_col, the first (leftmost) possible column is 0
to_col	Text Window extends to the right to column to_col (exclusive). This column has to be strictly greater than from_col, the maximum allowed value is TextMode::COLUMNS (rightmost)
from_row	Text Window starts in row from_row, the first possible (uppermost) row is 0
to_row	Text Window extends down to row to_row (exclusive). This row has to be strictly greater than from_row, the maximum allowed value is TextMode::ROWS (bottom-most)
use_cursor	Specifies whether the hardware cursor (true) or a software cursor/variable (false) should be used to store the current position

Todo:

Implement constructor

Set the cursor position in the window.

Depending on the constructor parameter use_cursor either the hardware cursor (and only the hardware cursor!) is used or the position is stored internally in the object.

The coordinates are relative to the upper left starting position of the window.

Parameters

rel_x	Column in window
rel_y	Row in window

Todo:

Implement method, use TextMode::setCursor() for the hardware cursor

Set the cursor position in the window.

Depending on the constructor parameter use_cursor either the hardware cursor (and only the hardware cursor!) is used or the position is stored internally in the object.

The coordinates are relative to the upper left starting position of the window. Negative coordinates are interpreted relative to the right and bottom border of the window.

Optional:

Implement this method (it can either use or replace setPos(unsigned, unsigned))

Get the current cursor position in the window.

Depending on the constructor parameter use_cursor either the hardware cursor (and only the hardware cursor!) is used or the position is retrieved from the internally stored object.

Parameters

rel_x	Column in window
rel_y	Row in window

Todo:

Implement Method, use TextMode::getCursor() for the hardware cursor

Get the current cursor position in the window.

Depending on the constructor parameter use_cursor either the hardware cursor (and only the hardware cursor!) is used or the position is retrieved from the internally stored object.

Parameters

rel_x	Column in window
rel_y	Row in window

Todo:

Implement Method, use TextMode::getCursor() for the hardware cursor

Display multiple characters in the window.

Output a character string, starting at the current cursor position. Since the string does not need to contain a \0 termination (unlike the common C string), a length parameter is required to specify the number of characters in the string. When the output is complete, the cursor is positioned after the last printed character. The same attributes (colors) are used for the entire text.

If there is not enough space left at the end of the line, the output continues on the following line. As soon as the last window line is filled, the entire window area is moved up one line: The first line disappears, the bottom line is cleared.

A line break also occurs whenever the character \n appears in the text.

Parameters

string	Text to be printed
length	Length of text
attrib	Attribute for text

Todo:

Implement Method

Delete all contents in the window and reset the cursor.

Parameters

character	Fill character
attrib	Attribute for fill character

Todo:

Implement Method

use hardware cursor

otherwise the position is stored in local variables