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+ added unit System.Terminal.View

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Nikolay Nikolov 2024-10-20 12:40:37 +03:00
parent bb684c0bb3
commit 9fc4759238
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packages/fcl-fpterm/src/system.terminal.view.pas Normal file
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{ This file is part of fpterm - a terminal emulator, written in Free Pascal
This unit defines the display of the terminal.
Copyright (C) 2022, 2024 Nikolay Nikolov <nickysn@users.sourceforge.net>
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
for more details.
You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA.
}
unit System.Terminal.View;
{$mode objfpc}{$H+}
interface
uses
System.Terminal.Base;
type
{ TTerminalView }
TTerminalView = class
protected
FReverseVideo: Boolean;
function GetCursorX: Integer; virtual; abstract;
function GetCursorY: Integer; virtual; abstract;
function GetHeight: Integer; virtual; abstract;
function GetWidth: Integer; virtual; abstract;
procedure SetCell(Y, X: Integer; AValue: TCell); virtual; abstract;
public
constructor Create; virtual;
procedure UpdateScreen; virtual; abstract;
procedure IdleLoop; virtual; abstract;
procedure HideCursor; virtual; abstract;
procedure ShowCursor; virtual; abstract;
procedure StartBlinkingCursor; virtual; abstract;
procedure StopBlinkingCursor; virtual; abstract;
procedure SetCursorPos(NewCursorX, NewCursorY: Integer); virtual; abstract;
{ Requests the view to resize itself. Can be triggered in response to a
CheckPendingResize call returning true, but also by other events, such as
by certain ESC sequences (i.e. resize requested by the app). }
function Resize(NewWidth, NewHeight: Integer): Boolean; virtual; abstract;
{ Checks for a resize event, initiated by the view (for example, a window
resize, initiated by the user, by resizing the console window with the
mouse). }
function CheckPendingResize(out NewWidth, NewHeight: Integer): Boolean; virtual; abstract;
{ Returns the number of character cells needed for the display of the given string }
function StringDisplayWidth(const S: UnicodeString): Integer; virtual; abstract;
property CursorX: Integer read GetCursorX;
property CursorY: Integer read GetCursorY;
property Width: Integer read GetWidth;
property Height: Integer read GetHeight;
property Cell [Y, X: Integer]: TCell {read GetCell} write SetCell;
property ReverseVideo: Boolean read FReverseVideo write FReverseVideo;
end;
implementation
{ TTerminalView }
constructor TTerminalView.Create;
begin
end;
end.