?
Solved

Create a new component

Posted on 2000-04-03
3
Medium Priority
?
221 Views
Last Modified: 2010-04-04
I wanne create a component that has the same functionality as TMonthCalendar class using TPanel and probably Tlabel. Would you tell me how can I write some code for it? Please let me know if you have any other suggestion to create such component?
0
Comment
Question by:rastkar
[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
3 Comments
 

Author Comment

by:rastkar
ID: 2679274
I like to have a Piece of code to start...
0
 
LVL 9

Expert Comment

by:ITugay
ID: 2679434
Use TStringGrid or TDrawGrid instead TPanel. It more easy.

---
Igor.
0
 
LVL 2

Accepted Solution

by:
mullet_attack earned 150 total points
ID: 2680467
Here's the bulk of an unfinished calendar I once wrote. It should compile (except the bitmaps are missing, but you should be able to recreate them easily) It duplicates most of the functionality of TMonthCalendar, plus some.

unit TopCalendar;

interface

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

type
  TTopCalendar = class(TCustomControl)
  private
    CalWidth : integer;
    CalHeight : integer;
    fCalColor: TColor;
    fBackColor: TColor;
    fTitleBackColor: TColor;
    fTitleTextColor: TColor;
    fDate: TDate;
    TitleHeight: integer;
    rBtnRect, lBtnRect : TRect;
    CalRect, TitleRect, DaysRect : TRect;
    TitleText : string;
    FontHeight : integer;
    RightBtnDown, LeftBtnDown : boolean;
    bmpToday, bmpTodayMask : TBitmap;
    bmpNo, bmpNoMask : TBitmap;
    procedure SetCalColor(const Value: TColor);
    procedure SetBackColor(const Value: TColor);
    procedure SetTitleBackColor(const Value: TColor);
    procedure SetTitleTextColor(const Value: TColor);
    procedure SetDate(const Value: TDate);
    function DayConv(dow : integer) : integer;
  protected
    procedure Resize;Override;
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);override;
    procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);override;
    procedure CalcSizes;
    procedure DrawButtons;
    procedure DrawDates;
    { Protected declarations }
  public
    Constructor Create(AOwner : TComponent);override;
    procedure Paint;override;
    { Public declarations }
  published
    property CalColor : TColor read fCalColor write SetCalColor default clWindow;
    property BackColor : TColor read fBackColor write SetBackColor default clBtnFace;
    property TitleBackColor : TColor read fTitleBackColor write fTitleBackColor default clActiveCaption;
    property TitleTextColor : TColor read fTitleTextColor write fTitleTextColor default clWhite;
    property Date : TDate read fDate write SetDate;
    { Published declarations }
  end;

{$R topcal.res}

const
  Days : array[0..6] of string = ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun') ;

procedure Register;

implementation

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

{ TTopCalendar }

constructor TTopCalendar.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  bmpToday := TBitmap.create;
  bmpToday.LoadFromResourceName(HInstance,'TODAY');
  bmpTodayMask := TBitmap.create;
  bmpTodayMask.LoadFromResourceName(HInstance,'TODAYMASK');
  bmpNo := TBitmap.create;
  bmpNo.LoadFromResourceName(HInstance,'NO');
  bmpNoMask := TBitmap.create;
  bmpNoMask.LoadFromResourceName(HInstance,'NOMASK');
  Caption := '';
  color := fCalColor;
  CalWidth := 190;
  CalHeight := 154;
  Width := CalWidth;
  Height := CalHeight;
  TitleHeight := 32;
  fCalColor := clWhite;
  fBackColor := clBtnFace;
  fTitleBackColor := clActiveCaption;
  fTitleTextColor := clWhite;
  RightBtnDown := false;
  LeftBtnDown := false;
  Date := now;
  CalcSizes;
end;

procedure TTopCalendar.Resize;
begin
  inherited;
  if Width < CalWidth then Width := CalWidth;
  if Height < CalHeight then Height := CalHeight;
  CalcSizes;
  invalidate;
end;

procedure TTopCalendar.Paint;
var
  t : integer;
begin
  inherited;
  with canvas do
    begin
      FontHeight := TextHeight(Days[0]);
      brush.Color := fBackColor;
      Fillrect(ClientRect);

      brush.color := fCalColor;
      FillRect(CalRect);

      brush.color := fTitleBackColor;
      FillRect(TitleRect);

      font.color := fTitleTextColor;
      font.style := font.style + [fsBold];
      TextOut(calRect.left + (calWidth - TextWidth(TitleText)) div 2,Calrect.Top + (TitleHeight - TextHeight(TitleText)) div 2 ,TitleText);

      brush.color := fCalColor;
      font.color := fTitleBackColor;
      font.style := font.style - [fsBold];
      for t := 0 to 6 do
        TextOut(CalRect.left + 4 + (((CalWidth  - 4) div 7) * t), TitleRect.bottom + 1, days[t]);

      pen.Color := clBlack;
      MoveTo(Calrect.left + 4,TitleRect.bottom + 1 + FontHeight);
      LineTo(Calrect.right - 4,TitleRect.bottom + 1 + FontHeight);
    end;
   DrawButtons;
   DrawDates;
end;

procedure TTopCalendar.SetBackColor(const Value: TColor);
begin
  fBackColor := Value;
  invalidate;
end;

procedure TTopCalendar.SetCalColor(const Value: TColor);
begin
  fCalColor := Value;
  invalidate;
end;

procedure TTopCalendar.SetTitleBackColor(const Value: TColor);
begin
  fTitleBackColor := Value;
  invalidate;
end;

procedure TTopCalendar.SetTitleTextColor(const Value: TColor);
begin
  fTitleBackColor := Value;
  invalidate;
end;
procedure TTopCalendar.SetDate(const Value: TDate);
begin
  fDate := Value;
  TitleText := FormatDateTime('mmmm yyyy',fDate);
  invalidate;
end;

procedure TTopCalendar.CalcSizes;
begin
  CalRect.left := (Width - CalWidth) div 2;
  CalRect.top := (Height - CalHeight) div 2;
  Calrect.Right := CalRect.Left + CalWidth;
  Calrect.Bottom := CalRect.Top + CalHeight;

  TitleRect.left := CalRect.left + 1;
  TitleRect.top := CalRect.top + 1;
  TitleRect.Right := CalRect.Left + CalWidth - 2;
  TitleRect.Bottom := CalRect.Top + TitleHeight;
  With lBtnRect do
    begin
      left := TitleRect.left + 6;
      top := TitleRect.Top + 6;
      right := left + 20;
      bottom := top + 16;
    end;
  With rBtnRect do
    begin
      right := TitleRect.right - 6;
      left := right - 20;
      top := TitleRect.Top + 6;
      bottom := top + 16;
    end;
end;

procedure TTopCalendar.DrawButtons;
var
  t,l : integer;
begin
  DrawButtonFace(Canvas, lBtnRect, 1, bsNew, false, LeftBtnDown, false);
  DrawButtonFace(Canvas, rBtnRect, 1, bsNew, false, RightBtnDown, false);
  canvas.Pen.color := clBlack;
  l := 4;
  for t := 0 to 4 do with canvas do
    begin
      MoveTo(rBtnRect.left + t + 7, rBtnRect.top + t + 3);
      LineTo(rbtnRect.left + t + 7, rBtnRect.top  + 3 + t + (l * 2));
      dec(l);
    end;
  l := 4;
  for t := 0 to 4 do with canvas do
    begin
      MoveTo(lBtnRect.left + l + 5, lBtnRect.top + 3 + t);
      LineTo(lbtnRect.left + l + 5, lBtnRect.top + 3 + t + (l * 2));
      dec(l);
    end;
end;

procedure TTopCalendar.MouseDown(Button: TMouseButton; Shift: TShiftState;
  X, Y: Integer);
var
  year, month, day : word;
begin
  inherited;
  if Button = mbLeft then
    begin
      if PtInRect(lBtnRect,point(x,y)) then
        begin
          LeftBtnDown := true;
          DecodeDate(fDate,Year, month, day);
          Dec(month);
          if month = 0 then
            begin
              dec(year);
              month := 12;
            end;
          Date := EncodeDate(year, month, day);
        end;
      if PtInRect(rBtnRect,point(x,y)) then
        begin
          RightBtnDown := true;
          DecodeDate(fDate,Year, month, day);
          inc(month);
          if month = 13 then
            begin
              inc(year);
              Month := 1;
            end;
          Date := EncodeDate(year, month, day);
        end;
      DrawButtons;
    end;

end;

procedure TTopCalendar.MouseUp(Button: TMouseButton; Shift: TShiftState; X,
  Y: Integer);
begin
  inherited;
  LeftBtnDown := false;
  RightBtnDown := false;
  DrawButtons;
end;

procedure TTopCalendar.DrawDates;
var
  StartDate : TDate;
  ThisMonth, Day ,Month ,Year : word;
  x,y : integer;
  p,z : integer;
  FHeight : integer;
  boxwidth, boxheight : integer;
begin
  FHeight := canvas.TextHeight(Days[1]);
   With DaysRect do
    begin
      left := CalRect.left + 4;
      right := left + CalWidth - 4;
      top := CalRect.top + TitleHeight + 2 + FHeight;
      bottom := top + (CalRect.bottom - CalRect.top) - (FHeight * 2) - TitleHeight - 2;
    end;
  DecodeDate(fDate, Year, Month, Day);
  ThisMonth := Month;
  z := DayOfWeek(EncodeDate(Year, Month, 1));
  p := DayConv(z);
  StartDate := EncodeDate(Year, Month, 1) - p + 1;
  DecodeDate(StartDate, Year, Month, Day);
  if day = 1 then StartDate := StartDate - 7;
  canvas.Brush.Color := fCalColor;
//  BoxWidth := DaysRect.left + ((DaysRect.right - DaysRect.left) div 7);
//  BoxHeight := DaysRect.top + ((DaysRect.Bottom - DaysRect.top) div 6);
  BoxWidth := (DaysRect.right - DaysRect.left) div 7;
  BoxHeight := (DaysRect.Bottom - DaysRect.top) div 6;
  for y := 0 to 5 do
    for x := 0 to 6 do
      begin
        DecodeDate(StartDate, Year, Month, Day);
        If Month = ThisMonth then
          canvas.brush.color := clyellow
        else
          canvas.brush.color := clwhite;
        If ((DayOfWeek(StartDate) = 1) or (DayOfWeek(StartDate) = 7)) then
          canvas.font.color := clRed
        else
          canvas.font.color := clGreen;

        canvas.fillrect(rect
                            (DaysRect.left + (BoxWidth * x)-2,
                             DaysRect.top + (BoxHeight * y),
                             DaysRect.left +  (BoxWidth  * (x + 1))-2,
                             DaysRect.top + (BoxHeight * (y +1))));
        canvas.textout(DaysRect.left + (BoxWidth * x) + 5,
                       DaysRect.top + (BoxHeight * y),
                       Format('%2d',[day]));
        if (StartDate = trunc(Now)) then
          begin
            canvas.CopyMode := cmSrcAnd;
            canvas.CopyRect(rect
                            (DaysRect.left + (BoxWidth * x)-2,
                             DaysRect.top + (BoxHeight * y),
                             DaysRect.left +  (BoxWidth  * (x + 1))-2,
                             DaysRect.top + (BoxHeight * (y +1))),
                             bmpTodayMask.canvas,
                            rect(
                             0,
                             0,
                             bmpTodayMask.width,
                             bmpTodayMask.height));
            canvas.CopyMode := cmSrcPaint;
            canvas.CopyRect(rect(
                             DaysRect.left + (BoxWidth * x-2),
                             DaysRect.top + (BoxHeight * y),
                             DaysRect.left + (BoxWidth * (x + 1))-2,
                             DaysRect.top + (BoxHeight * (y + 1))),
                             bmpToday.canvas,
                            rect(
                             0,
                             0,
                             bmpTodayMask.width,
                             bmpTodayMask.height));

          end;
        if true = false then
          begin
            canvas.CopyMode := cmSrcAnd;
            canvas.CopyRect(rect
                            (DaysRect.left + (BoxWidth * x)-2,
                             DaysRect.top + (BoxHeight * y),
                             DaysRect.left +  (BoxWidth  * (x + 1))-2,
                             DaysRect.top + (BoxHeight * (y +1))),
                             bmpNoMask.canvas,
                            rect(
                             0,
                             0,
                             bmpNoMask.width,
                             bmpNoMask.height));
            canvas.CopyMode := cmSrcPaint;
            canvas.CopyRect(rect(
                             DaysRect.left + (BoxWidth * x-2),
                             DaysRect.top + (BoxHeight * y),
                             DaysRect.left + (BoxWidth * (x + 1))-2,
                             DaysRect.top + (BoxHeight * (y + 1))),
                             bmpNo.canvas,
                            rect(
                             0,
                             0,
                             bmpNoMask.width,
                             bmpNoMask.height));

          end;
        StartDate := StartDate + 1;
      end;
end;

function TTopCalendar.DayConv(dow: integer): integer;
begin
  if dow = 1 then
   result := 7
 else
   result := dow - 1;  
end;

end.
0

Featured Post

Want to be a Web Developer? Get Certified Today!

Enroll in the Certified Web Development Professional course package to learn HTML, Javascript, and PHP. Build a solid foundation to work toward your dream job!

Question has a verified solution.

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

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
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…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

741 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