[Last Call] Learn about multicloud storage options and how to improve your company's cloud strategy. Register Now

x
?
Solved

Cursor is not showing

Posted on 2007-04-03
3
Medium Priority
?
231 Views
Last Modified: 2010-04-05
Dear Experts,

I have a little example on my site that works 100%. But I want to change the code to make a component out of it with anchor type: TCustomPanel.

My example is on my site: http://members.home.nl/peterkiers/
(underneath the Under Construction bar you see a floppy disk)

This is what I made myself, but the cursor is not
showing what do I do wrong? In the example a Timer
is used for the cursor, how can I declare the Timer in this code below with Enable = false, Interval =200 and
the name of the Timer is CursorFlashTimer.

unit MyDrawingPanel;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ExtCtrls;

const
  csrUnderLine = 0;
  csrEmptyBox = 1;
  cdDefault = $00;
  cdFieldAttr = $01;
  caDefault = $00;
  caProtect = $20;
  caNumeric = $10;
  caSelPen = $04;
  caIntens = $08;
  caNonDisp = $0C;
  caMDT = $01;
  ccDefault = $00;
  ccBlue = $F1;
  ccRed = $F2;
  ccPink = $F3;
  ccGreen = $F4;
  ccTurquoise = $F5;
  ccYellow = $F6;
  ccWhite = $F7;
  chDefault = $00;
  chBlink = $F1;
  chReverse = $F2;
  chUnderLine = $F4;
  csDefault = $00;
  csAPL = $F1;

type
  TScrCell = record
    Data: char;
    Attrib: char;
    Hilite: char;
    CharSet: char;
    Color: char;
    OldColor: char;
    IsOldColorSet: Boolean;
  end;

  TScrBuf = array[1..25, 1..80] of TScrCell;
  PScrBuf = ^TScrBuf;

  TCharSet = set of char;
  const ValidChars: TCharSet = ['A'..'Z', 'a'..'z', '0'..'9'];

type
  TMyDrawingPanel = class(TCustomPanel)
  private
    { Private declarations }
  Bounding: Boolean;
  fcursorVisible: boolean;
  AnchorX, AnchorY,
  CurX, CurY: Integer;
  SCRROWS: integer;
  SCRCOLS: integer;
  FontWidthPix: integer;
  FontHeightPix: integer;
  ScrBuf: TScrBuf;
  FontName: string;
  FontSize: integer;
  ColorRed: TColor;
  ColorGreen: TColor;
  ColorBlue: TColor;
  ColorYellow: TColor;
  ColorPink: TColor;
  ColorTurq: TColor;
  ColorWhite: TColor;
  ColorBlack: TColor;
  CsrCol: integer;
  CsrRow: integer;
  CsrShape: integer;
  CurCellColor: char;
  CurCellHilite: char;
  socOpen: boolean;
  LastcursorX, LastcursorY: integer;
  protected
    { Protected declarations }
  public
    { Public declarations }
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    procedure Paint; override;
    procedure ShowBuf;
    procedure DispCell(x: integer; y: integer; PaintBlanks: boolean);
    function ColorMapI2W(ic: char): TColor;
    procedure DrawCursor(x: integer; y: integer);

  published
    { Published declarations }
  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('Samples', [TMyDrawingPanel]);
end;

{ TMyDrawingPanel }

function TMyDrawingPanel.ColorMapI2W(ic: char): TColor;
begin
  if Byte(ic) = ccDefault then Result := ColorGreen
  else if Byte(ic) = ccBlue then Result := ColorBlue
  else if Byte(ic) = ccRed then Result := ColorRed
  else if Byte(ic) = ccPink then Result := ColorPink
  else if Byte(ic) = ccGreen then Result := ColorGreen
  else if Byte(ic) = ccYellow then Result := ColorYellow
  else if Byte(ic) = ccTurquoise then Result := ColorTurq
  else if Byte(ic) = ccWhite then Result := ColorWhite
  else Result := ColorGreen;
end;

constructor TMyDrawingPanel.Create(AOwner: TComponent);
var
  TxMetric: TTextMetric;
begin
  inherited Create (AOwner);
  SCRCOLS := 80;
  SCRROWS := 24;
  SocOpen := False;
  ColorRed := clRed;
  ColorGreen := clLime;
  ColorBlue := clBlue;
  ColorYellow := clYellow;
  ColorPink := clFuchsia;
  ColorTurq := clAqua;
  ColorWhite := clWhite;
  ColorBlack := clBlack;
  CurCellColor := Char(ccDefault);
  CurCellHilite := Char(chDefault);
  CsrShape := csrUnderLine;
  CsrRow := 1;
  CsrCol := 1;
  FontName := 'Terminal';
  FontSize := 9;
  Font.Size := FontSize;
  Font.Name := FontName;
end;

destructor TMyDrawingPanel.Destroy;
begin
  inherited;
//
end;

procedure TMyDrawingPanel.DispCell(x, y: integer; PaintBlanks: boolean);
var
  xpos, ypos: integer;
  r:TRect;
begin
  xpos := (x * FontWidthPix) - FontWidthPix;
  ypos := (y * FontHeightPix) - FontHeightPix;
  with Canvas do
  begin
    Brush.Style := bsSolid;
    Brush.Color := ColorBlack;
    if (ScrBuf[y, x].data = Char(cdDefault)) or
      (ScrBuf[y, x].data = Char(cdFieldAttr)) then
    begin
      if PaintBlanks then
      begin
        Font.Style := [];
        TextOut(xpos, ypos, ' ');
      end;
    end
    else
    begin
      if (Byte(ScrBuf[y, x].attrib) and caNonDisp) <> caNonDisp then
      begin
        Pen.Mode := pmCopy;
        Font.Color := ColorMapI2W(ScrBuf[y, x].color);
        if ScrBuf[y, x].hilite = Char(chDefault) then
          Font.Style := []
        else if ScrBuf[y, x].hilite = Char(chReverse) then
        begin
          Font.Style := [];
          Pen.Mode := pmXor;
          Brush.Color := ColorMapI2W(ScrBuf[y, x].color);
          Font.Color := ColorBlack;
        end
        else if ScrBuf[y, x].hilite = Char(chUnderLine) then
          Font.Style := [fsUnderline]
        else if ScrBuf[y, x].hilite = Char(chBlink) then
          Font.Style := [fsStrikeout]
        else
          Font.Style := [];
        if (Byte(ScrBuf[y, x].attrib) and caIntens) = caIntens then
          Font.Style := Font.Style + [fsBold];
         r := Rect(xpos,ypos,xpos+(FontWidthPix ),ypos+(FontHeightPix ));
         canvas.FillRect(r);
         TextOut(xpos, ypos, ScrBuf[y, x].data);
      end
      else
        TextOut(xpos, ypos, ' ');
    end;
  end;
end;

procedure TMyDrawingPanel.DrawCursor(x, y: integer);
var
  xpos, ypos: integer;
begin
  xpos := (CsrCol * FontWidthPix) - FontWidthPix;
  ypos := (CsrRow * FontHeightPix) - 1;
  with Canvas do
  begin
    if csrShape = csrUnderLine then
    begin
      Pen.Mode := pmWhite;
      Pen.Color := ColorWhite;
      Brush.Style := bsSolid;
      Brush.Color := ColorWhite;
      MoveTo(xpos, ypos);
      LineTo(xpos + FontWidthPix, ypos);
    end
    else
    begin
      Pen.Mode := pmXor;
      Pen.Color := ColorMapI2W(ScrBuf[CsrRow, CsrCol].color);
      Brush.Style := bsSolid;
      Brush.Color := ColorMapI2W(ScrBuf[CsrRow, CsrCol].color);
      Rectangle(xpos, ypos - FontHeightPix + 1, xpos + FontWidthPix, ypos);
    end;
  end;
  LastcursorX := CsrCol;
  LastcursorY := CsrRow;
end;

procedure TMyDrawingPanel.Paint;
begin
  Showbuf;
end;

procedure TMyDrawingPanel.ShowBuf;
var
  i, j: integer;
begin
  Canvas.Lock;
  try
    with Canvas do
    begin
      Brush.Style := bsSolid;
      Brush.Color := ColorBlack;
      FillRect(ClientRect);
    end;
    for i := 1 to SCRROWS do
      for j := 1 to SCRCOLS do
        DispCell(j, i, false);
      DrawCursor(CsrCol, CsrRow);
 // ShowStatus ;
  finally
    Canvas.Unlock;
  end;
end;

end.


Greetings,
Peter
0
Comment
Question by:peterkiers
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 1

Author Comment

by:peterkiers
ID: 18848090
And...
 in the OnCreate-event of the example this is
 declared:

  FontName := 'Terminal';
  FontSize := 9;
  Font.Size := FontSize;
  Font.Name := FontName;
  GetTextMetrics(Canvas.Handle, TxMetric);
  FontWidthPix := TxMetric.tmMaxCharWidth;
  FontHeightPix := TxMetric.tmHeight;

Where can I put these line in the component-unit?
0
 
LVL 17

Accepted Solution

by:
TheRealLoki earned 2000 total points
ID: 18848749
type
  TMyDrawingPanel = class(TCustomPanel)
  private
    { Private declarations }
  CursorFlashTimer: TTImer;
  procedure CursorFlashTimer_OnTImer(sender: TObject); // this is the event
...
...



constructor TMyDrawingPanel.Create(AOwner: TComponent);
var
  TxMetric: TTextMetric;
begin
  inherited Create (AOwner);
  CursorFlashTimer := TTimer.Create(self);
  with  CursorFlashTimer do
  begin
    Enabled := False;
    Interval := 200;
    OnTimer := CursorFlashTimer_OnTImer;
  end;


destructor TMyDrawingPanel.Destroy;
begin
  CursorFlashTimer.Enabled := False;
  CursorFlashTimer.Free;
  inherited;
//
end;...
0
 
LVL 1

Author Comment

by:peterkiers
ID: 18849355
Thanks TheRealLoki

Peter
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…
Is your data getting by on basic protection measures? In today’s climate of debilitating malware and ransomware—like WannaCry—that may not be enough. You need to establish more than basics, like a recovery plan that protects both data and endpoints.…
Suggested Courses

650 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question