[DelPhi] Edit에 버튼을 넣어보자 소스

// 컴포넌트를 Install 한다음 Samples 디렉토리에 가서

// EditButton 을 한번 시험해 보는 것도 재미 있을듯..

unit ButtonEdit;

interface

uses

Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,

StdCtrls;

type

TButtonEdit = class(TEdit)

private

//FCanvas: TCanvas; //commented out - see below!

//do you want to 'click' when the up or down arrow key pressed as well?

FClickOnArrow: boolean;

//do you want to 'click' when the Return key pressed as well?

FClickOnReturn: boolean;

//flag - is the button pressed or not

FPressed: boolean;

procedure Click; override;

procedure CreateWnd; override;

procedure WMPAINT(var Message: TMessage); message WM_PAINT;

procedure WMLBUTTONDOWN(var Message: TWMMouse); message WM_LBUTTONDOWN;

procedure WMLBUTTONUP(var Message: TWMMouse); message WM_LBUTTONUP;

procedure WMMOUSEMOVE(var Message: TWMMouse); message WM_MOUSEMOVE;

//procedure WMSETFOCUS(var Message: TMessage); message WM_SETFOCUS;

protected

procedure KeyDown(var Key: Word; Shift: TShiftState); override;

public

constructor Create(AOwner: TComponent); override;

published

property ClickOnArrow: boolean read FClickOnArrow write FClickOnArrow;

property ClickOnReturn: boolean read FClickOnReturn write FClickOnReturn;

end;

procedure Register;

implementation

const

BUTTONWIDTH = 17;

{----------------------------------------------------------------------}

{----------------------------------------------------------------------}

procedure Register;

begin

RegisterComponents('Samples', [TButtonEdit]);

end;

{----------------------------------------------------------------------}

constructor TButtonEdit.Create(AOwner: TComponent);

begin

inherited Create(AOwner);

FPressed := false;

FClickOnArrow := true;

FClickOnReturn := false;

end;

{----------------------------------------------------------------------}

procedure TButtonEdit.CreateWnd;

begin

inherited CreateWnd;

//this is crucial to stop text disappearing under the button...

perform(EM_SETMARGINS,EC_RIGHTMARGIN,(BUTTONWIDTH+2) shl 16);

end;

{----------------------------------------------------------------------}

procedure TButtonEdit.WMLBUTTONDOWN(var Message: TWMMouse);

begin

inherited;

//draw button in pressed state...

if message.xpos >= clientwidth-BUTTONWIDTH+1 then begin

FPressed := true;

Refresh;

end;

end;

{----------------------------------------------------------------------}

procedure TButtonEdit.WMLBUTTONUP(var Message: TWMMouse);

begin

inherited;

//draw button in non-pressed state...

if FPressed then begin

FPressed := false;

Refresh;

end;

end;

{----------------------------------------------------------------------}

procedure TButtonEdit.WMMOUSEMOVE(var Message: TWMMouse);

begin

inherited;

//change cursor when over the button to an arrow (not the default I-beam)...

if message.xpos >= clientwidth-BUTTONWIDTH+1 then cursor := crArrow

else cursor := crDefault;

end;

{----------------------------------------------------------------------}

procedure TButtonEdit.Click;

var

pt: TPoint;

begin

//fix a minor cosmetic problem...

if FPressed then begin

FPressed := false;

Repaint;

end;

//Only process an OnClick method if the button is clicked,

//NOT if the text is clicked!

GetCursorPos(pt);

if PtInRect(Rect(clientwidth-BUTTONWIDTH+1,0,clientwidth,clientheight),

ScreenToClient(pt)) then inherited Click;

end;

{----------------------------------------------------------------------}

procedure TButtonEdit.KeyDown(var Key: Word; Shift: TShiftState);

begin

//respond to up or down arrow keys or Return key with OnClick event if

//"ClickOnArrow" or "ClickOnReturn" property set...

inherited KeyDown(Key, Shift);

if ((Key = vk_Down) or (Key = vk_Up))

and (Shift = []) and FClickOnArrow then begin

Key := 0;

inherited Click;

end

else if (Key = vk_return) and FClickOnReturn then begin

Key := 0;

inherited Click;

end;

end;

{----------------------------------------------------------------------}

//This no longer seems to be necessary ... I've left it here just in case!

{procedure TButtonEdit.WMSETFOCUS(var Message: TMessage);

begin

inherited;

repaint;

end;}

{----------------------------------------------------------------------}

procedure TButtonEdit.WMPAINT(var Message: TMessage);

var

dc: HDC;

CntrPt: TPoint;

pic: array [0..3] of TPoint; //arrow 'picture' points

begin

// let windows draw the text!

// I don't really want to struggle with all the scrolling issues etc!

inherited;

//NOW DRAW THE BUTTON ... (not as bad as it looks if you take out the comments!)

//find the centre of the button...

CntrPt := point(clientwidth - BUTTONWIDTH div 2, clientheight div 2);

//offset CntrPt by 1 if pressed...

if FPressed then CntrPt := point(CntrPt.x+1,CntrPt.y+1);

//get button arrow drawing coordinates from CntrPt...

pic[0] := point( CntrPt.x-5,CntrPt.y);

pic[1] := point( CntrPt.x,CntrPt.y-5);

pic[2] := point( CntrPt.x+5, CntrPt.y);

pic[3] := point( CntrPt.x, CntrPt.y+5);

//Notes:

//1. As I'm calling the inherited WMPAINT method before drawing the button -

// I have to use getDC(handle) instead of beginpaint(handle,paintstruct)

// otherwise I don't see the button! (I think due to clipping.)

//2. If I wanted to draw the text as well as the button (without calling

// the inherited method) then I would have to use beginpaint(handle,paintstruct).

dc := getDC(handle);

//To make this method a little more efficient you could add a private Canvas field

// to the component and create it once only in TButtonEdit.create and free it in

//TButtonEdit.destroy. I've kept it all here for simplicity.

//(Don't use TControlCanvas instead of TCanvas in TButtonEdit.create -

//It doesn't work! - Someone might explain TControlCanvas to me.)

with TCanvas.create do begin

Handle := dc;

Brush.Color := clBtnFace;

//Brush.style := bsSolid;

//paint the button surface...

FillRect(rect(clientwidth-BUTTONWIDTH+1,0,clientwidth,clientheight));

//draw the button edges...

if FPressed then Pen.color := clBtnShadow else Pen.color := clBtnHighlight;

Moveto(clientwidth-BUTTONWIDTH+2,clientheight-1);

Lineto(clientwidth-BUTTONWIDTH+2,1);

Lineto(clientwidth-1,1);

if FPressed then Pen.color := clBtnHighlight else Pen.color := clBtnShadow;

Lineto(clientwidth-1,clientheight-1);

Lineto(clientwidth-BUTTONWIDTH+2,clientheight-1);

//draw the arrows...

Brush.Color := clGreen;

Pen.color := clBlack;

polygon(pic);

Pen.color := clBtnFace;

Moveto(CntrPt.x-5,CntrPt.y);

Lineto(CntrPt.x+6,CntrPt.y);

Handle := 0;

free; //the canvas.

end;

ReleaseDC(handle,dc);

end;

{----------------------------------------------------------------------}

(*

//Old WMPAINT Method (not using TCanvas)...

procedure TButtonEdit.WMPAINT(var Message: TMessage);

var

dc: HDC;

SilverBrush, ArrowBrush, Oldbrush: HBrush;

WhitePen, GrayPen, SilverPen, OldPen: HPen;

CntrPt: TPoint;

pic: array [0..3] of TPoint; // for arrow 'picture'.

begin

inherited;

//NOW DRAW BUTTON ...

//find the centre of the button...

CntrPt := point(clientwidth - BUTTONWIDTH div 2, clientheight div 2);

//offset by 1 if pressed...

if FPressed then CntrPt := point(CntrPt.x+1,CntrPt.y+1);

//get button arrow coordinates...

pic[0] := point( CntrPt.x-5,CntrPt.y);

pic[1] := point( CntrPt.x,CntrPt.y-5);

pic[2] := point( CntrPt.x+5, CntrPt.y);

pic[3] := point( CntrPt.x, CntrPt.y+5);

//create handles ...

dc := getDC(handle);

SilverBrush := CreateSolidBrush(GetSysColor(COLOR_BTNFACE));

ArrowBrush := CreateSolidBrush(clGreen);

WhitePen := CreatePen(PS_SOLID,1,clWhite);

GrayPen := CreatePen(PS_SOLID,1,clGray);

SilverPen := CreatePen(PS_SOLID,1,GetSysColor(COLOR_BTNFACE));

//draw button surface and outline...

OldBrush := SelectObject(dc, ArrowBrush);

FillRect(dc,rect(clientwidth-BUTTONWIDTH+1,0,clientwidth,clientheight),SilverBrush);

if FPressed then OldPen := SelectObject(dc,GrayPen)

else OldPen := SelectObject(dc,WhitePen);

MovetoEx(dc,clientwidth-BUTTONWIDTH+2,clientheight-1,nil);

Lineto(dc,clientwidth-BUTTONWIDTH+2,1);

Lineto(dc,clientwidth-1,1);

if FPressed then SelectObject(dc,WhitePen)

else SelectObject(dc,GrayPen);

Lineto(dc,clientwidth-1,clientheight-1);

Lineto(dc,clientwidth-BUTTONWIDTH+2,clientheight-1);

//draw up&down arrows...

SelectObject(dc,OldPen);

polygon(dc,pic,4);

SelectObject(dc,SilverPen);

MovetoEx(dc,CntrPt.x-5,CntrPt.y,nil);

Lineto(dc,CntrPt.x+6,CntrPt.y);

//clean up ...

SelectObject(dc,OldPen);

SelectObject(dc, OldBrush);

DeleteObject(WhitePen);

DeleteObject(SilverPen);

DeleteObject(GrayPen);

DeleteObject(SilverBrush);

DeleteObject(ArrowBrush);

ReleaseDC(handle,dc);

end;

*)

{----------------------------------------------------------------------}

end.