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SPIN.PAS
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Pascal/Delphi Source File
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1999-08-11
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17KB
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640 lines
unit Spin;
interface
uses Windows, Classes, StdCtrls, ExtCtrls, Controls, Messages, SysUtils,
Forms, Graphics, Menus, Buttons;
const
InitRepeatPause = 400; { pause before repeat timer (ms) }
RepeatPause = 100; { pause before hint window displays (ms)}
type
TNumGlyphs = Buttons.TNumGlyphs;
TTimerSpeedButton = class;
{ TSpinButton }
TSpinButton = class (TWinControl)
private
FUpButton: TTimerSpeedButton;
FDownButton: TTimerSpeedButton;
FFocusedButton: TTimerSpeedButton;
FFocusControl: TWinControl;
FOnUpClick: TNotifyEvent;
FOnDownClick: TNotifyEvent;
function CreateButton: TTimerSpeedButton;
function GetUpGlyph: TBitmap;
function GetDownGlyph: TBitmap;
procedure SetUpGlyph(Value: TBitmap);
procedure SetDownGlyph(Value: TBitmap);
function GetUpNumGlyphs: TNumGlyphs;
function GetDownNumGlyphs: TNumGlyphs;
procedure SetUpNumGlyphs(Value: TNumGlyphs);
procedure SetDownNumGlyphs(Value: TNumGlyphs);
procedure BtnClick(Sender: TObject);
procedure BtnMouseDown (Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure SetFocusBtn (Btn: TTimerSpeedButton);
procedure AdjustSize (var W, H: Integer); reintroduce;
procedure WMSize(var Message: TWMSize); message WM_SIZE;
procedure WMSetFocus(var Message: TWMSetFocus); message WM_SETFOCUS;
procedure WMKillFocus(var Message: TWMKillFocus); message WM_KILLFOCUS;
procedure WMGetDlgCode(var Message: TWMGetDlgCode); message WM_GETDLGCODE;
protected
procedure Loaded; override;
procedure KeyDown(var Key: Word; Shift: TShiftState); override;
procedure Notification(AComponent: TComponent;
Operation: TOperation); override;
public
constructor Create(AOwner: TComponent); override;
procedure SetBounds(ALeft, ATop, AWidth, AHeight: Integer); override;
published
property Align;
property Anchors;
property Constraints;
property Ctl3D;
property DownGlyph: TBitmap read GetDownGlyph write SetDownGlyph;
property DownNumGlyphs: TNumGlyphs read GetDownNumGlyphs write SetDownNumGlyphs default 1;
property DragCursor;
property DragKind;
property DragMode;
property Enabled;
property FocusControl: TWinControl read FFocusControl write FFocusControl;
property ParentCtl3D;
property ParentShowHint;
property PopupMenu;
property ShowHint;
property TabOrder;
property TabStop;
property UpGlyph: TBitmap read GetUpGlyph write SetUpGlyph;
property UpNumGlyphs: TNumGlyphs read GetUpNumGlyphs write SetUpNumGlyphs default 1;
property Visible;
property OnDownClick: TNotifyEvent read FOnDownClick write FOnDownClick;
property OnDragDrop;
property OnDragOver;
property OnEndDock;
property OnEndDrag;
property OnEnter;
property OnExit;
property OnStartDock;
property OnStartDrag;
property OnUpClick: TNotifyEvent read FOnUpClick write FOnUpClick;
end;
{ TSpinEdit }
TSpinEdit = class(TCustomEdit)
private
FMinValue: LongInt;
FMaxValue: LongInt;
FIncrement: LongInt;
FButton: TSpinButton;
FEditorEnabled: Boolean;
function GetMinHeight: Integer;
function GetValue: LongInt;
function CheckValue (NewValue: LongInt): LongInt;
procedure SetValue (NewValue: LongInt);
procedure SetEditRect;
procedure WMSize(var Message: TWMSize); message WM_SIZE;
procedure CMEnter(var Message: TCMGotFocus); message CM_ENTER;
procedure CMExit(var Message: TCMExit); message CM_EXIT;
procedure WMPaste(var Message: TWMPaste); message WM_PASTE;
procedure WMCut(var Message: TWMCut); message WM_CUT;
protected
procedure GetChildren(Proc: TGetChildProc; Root: TComponent); override;
function IsValidChar(Key: Char): Boolean; virtual;
procedure UpClick (Sender: TObject); virtual;
procedure DownClick (Sender: TObject); virtual;
procedure KeyDown(var Key: Word; Shift: TShiftState); override;
procedure KeyPress(var Key: Char); override;
procedure CreateParams(var Params: TCreateParams); override;
procedure CreateWnd; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property Button: TSpinButton read FButton;
published
property Anchors;
property AutoSelect;
property AutoSize;
property Color;
property Constraints;
property Ctl3D;
property DragCursor;
property DragMode;
property EditorEnabled: Boolean read FEditorEnabled write FEditorEnabled default True;
property Enabled;
property Font;
property Increment: LongInt read FIncrement write FIncrement default 1;
property MaxLength;
property MaxValue: LongInt read FMaxValue write FMaxValue;
property MinValue: LongInt read FMinValue write FMinValue;
property ParentColor;
property ParentCtl3D;
property ParentFont;
property ParentShowHint;
property PopupMenu;
property ReadOnly;
property ShowHint;
property TabOrder;
property TabStop;
property Value: LongInt read GetValue write SetValue;
property Visible;
property OnChange;
property OnClick;
property OnDblClick;
property OnDragDrop;
property OnDragOver;
property OnEndDrag;
property OnEnter;
property OnExit;
property OnKeyDown;
property OnKeyPress;
property OnKeyUp;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnStartDrag;
end;
{ TTimerSpeedButton }
TTimeBtnState = set of (tbFocusRect, tbAllowTimer);
TTimerSpeedButton = class(TSpeedButton)
private
FRepeatTimer: TTimer;
FTimeBtnState: TTimeBtnState;
procedure TimerExpired(Sender: TObject);
protected
procedure Paint; override;
procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
X, Y: Integer); override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
X, Y: Integer); override;
public
destructor Destroy; override;
property TimeBtnState: TTimeBtnState read FTimeBtnState write FTimeBtnState;
end;
implementation
{$R SPIN}
{ TSpinButton }
constructor TSpinButton.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
ControlStyle := ControlStyle - [csAcceptsControls, csSetCaption] +
[csFramed, csOpaque];
FUpButton := CreateButton;
FDownButton := CreateButton;
UpGlyph := nil;
DownGlyph := nil;
Width := 20;
Height := 25;
FFocusedButton := FUpButton;
end;
function TSpinButton.CreateButton: TTimerSpeedButton;
begin
Result := TTimerSpeedButton.Create (Self);
Result.OnClick := BtnClick;
Result.OnMouseDown := BtnMouseDown;
Result.Visible := True;
Result.Enabled := True;
Result.TimeBtnState := [tbAllowTimer];
Result.Parent := Self;
end;
procedure TSpinButton.Notification(AComponent: TComponent;
Operation: TOperation);
begin
inherited Notification(AComponent, Operation);
if (Operation = opRemove) and (AComponent = FFocusControl) then
FFocusControl := nil;
end;
procedure TSpinButton.AdjustSize (var W, H: Integer);
begin
if (FUpButton = nil) or (csLoading in ComponentState) then Exit;
if W < 15 then W := 15;
FUpButton.SetBounds (0, 0, W, H div 2);
FDownButton.SetBounds (0, FUpButton.Height - 1, W, H - FUpButton.Height + 1);
end;
procedure TSpinButton.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
var
W, H: Integer;
begin
W := AWidth;
H := AHeight;
AdjustSize (W, H);
inherited SetBounds (ALeft, ATop, W, H);
end;
procedure TSpinButton.WMSize(var Message: TWMSize);
var
W, H: Integer;
begin
inherited;
{ check for minimum size }
W := Width;
H := Height;
AdjustSize (W, H);
if (W <> Width) or (H <> Height) then
inherited SetBounds(Left, Top, W, H);
Message.Result := 0;
end;
procedure TSpinButton.WMSetFocus(var Message: TWMSetFocus);
begin
FFocusedButton.TimeBtnState := FFocusedButton.TimeBtnState + [tbFocusRect];
FFocusedButton.Invalidate;
end;
procedure TSpinButton.WMKillFocus(var Message: TWMKillFocus);
begin
FFocusedButton.TimeBtnState := FFocusedButton.TimeBtnState - [tbFocusRect];
FFocusedButton.Invalidate;
end;
procedure TSpinButton.KeyDown(var Key: Word; Shift: TShiftState);
begin
case Key of
VK_UP:
begin
SetFocusBtn (FUpButton);
FUpButton.Click;
end;
VK_DOWN:
begin
SetFocusBtn (FDownButton);
FDownButton.Click;
end;
VK_SPACE:
FFocusedButton.Click;
end;
end;
procedure TSpinButton.BtnMouseDown (Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
if Button = mbLeft then
begin
SetFocusBtn (TTimerSpeedButton (Sender));
if (FFocusControl <> nil) and FFocusControl.TabStop and
FFocusControl.CanFocus and (GetFocus <> FFocusControl.Handle) then
FFocusControl.SetFocus
else if TabStop and (GetFocus <> Handle) and CanFocus then
SetFocus;
end;
end;
procedure TSpinButton.BtnClick(Sender: TObject);
begin
if Sender = FUpButton then
begin
if Assigned(FOnUpClick) then FOnUpClick(Self);
end
else
if Assigned(FOnDownClick) then FOnDownClick(Self);
end;
procedure TSpinButton.SetFocusBtn (Btn: TTimerSpeedButton);
begin
if TabStop and CanFocus and (Btn <> FFocusedButton) then
begin
FFocusedButton.TimeBtnState := FFocusedButton.TimeBtnState - [tbFocusRect];
FFocusedButton := Btn;
if (GetFocus = Handle) then
begin
FFocusedButton.TimeBtnState := FFocusedButton.TimeBtnState + [tbFocusRect];
Invalidate;
end;
end;
end;
procedure TSpinButton.WMGetDlgCode(var Message: TWMGetDlgCode);
begin
Message.Result := DLGC_WANTARROWS;
end;
procedure TSpinButton.Loaded;
var
W, H: Integer;
begin
inherited Loaded;
W := Width;
H := Height;
AdjustSize (W, H);
if (W <> Width) or (H <> Height) then
inherited SetBounds (Left, Top, W, H);
end;
function TSpinButton.GetUpGlyph: TBitmap;
begin
Result := FUpButton.Glyph;
end;
procedure TSpinButton.SetUpGlyph(Value: TBitmap);
begin
if Value <> nil then
FUpButton.Glyph := Value
else
begin
FUpButton.Glyph.Handle := LoadBitmap(HInstance, 'SpinUp');
FUpButton.NumGlyphs := 1;
FUpButton.Invalidate;
end;
end;
function TSpinButton.GetUpNumGlyphs: TNumGlyphs;
begin
Result := FUpButton.NumGlyphs;
end;
procedure TSpinButton.SetUpNumGlyphs(Value: TNumGlyphs);
begin
FUpButton.NumGlyphs := Value;
end;
function TSpinButton.GetDownGlyph: TBitmap;
begin
Result := FDownButton.Glyph;
end;
procedure TSpinButton.SetDownGlyph(Value: TBitmap);
begin
if Value <> nil then
FDownButton.Glyph := Value
else
begin
FDownButton.Glyph.Handle := LoadBitmap(HInstance, 'SpinDown');
FUpButton.NumGlyphs := 1;
FDownButton.Invalidate;
end;
end;
function TSpinButton.GetDownNumGlyphs: TNumGlyphs;
begin
Result := FDownButton.NumGlyphs;
end;
procedure TSpinButton.SetDownNumGlyphs(Value: TNumGlyphs);
begin
FDownButton.NumGlyphs := Value;
end;
{ TSpinEdit }
constructor TSpinEdit.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FButton := TSpinButton.Create (Self);
FButton.Width := 15;
FButton.Height := 17;
FButton.Visible := True;
FButton.Parent := Self;
FButton.FocusControl := Self;
FButton.OnUpClick := UpClick;
FButton.OnDownClick := DownClick;
Text := '0';
ControlStyle := ControlStyle - [csSetCaption];
FIncrement := 1;
FEditorEnabled := True;
end;
destructor TSpinEdit.Destroy;
begin
FButton := nil;
inherited Destroy;
end;
procedure TSpinEdit.GetChildren(Proc: TGetChildProc; Root: TComponent);
begin
end;
procedure TSpinEdit.KeyDown(var Key: Word; Shift: TShiftState);
begin
if Key = VK_UP then UpClick (Self)
else if Key = VK_DOWN then DownClick (Self);
inherited KeyDown(Key, Shift);
end;
procedure TSpinEdit.KeyPress(var Key: Char);
begin
if not IsValidChar(Key) then
begin
Key := #0;
MessageBeep(0)
end;
if Key <> #0 then inherited KeyPress(Key);
end;
function TSpinEdit.IsValidChar(Key: Char): Boolean;
begin
Result := (Key in [DecimalSeparator, '+', '-', '0'..'9']) or
((Key < #32) and (Key <> Chr(VK_RETURN)));
if not FEditorEnabled and Result and ((Key >= #32) or
(Key = Char(VK_BACK)) or (Key = Char(VK_DELETE))) then
Result := False;
end;
procedure TSpinEdit.CreateParams(var Params: TCreateParams);
begin
inherited CreateParams(Params);
{ Params.Style := Params.Style and not WS_BORDER; }
Params.Style := Params.Style or ES_MULTILINE or WS_CLIPCHILDREN;
end;
procedure TSpinEdit.CreateWnd;
begin
inherited CreateWnd;
SetEditRect;
end;
procedure TSpinEdit.SetEditRect;
var
Loc: TRect;
begin
SendMessage(Handle, EM_GETRECT, 0, LongInt(@Loc));
Loc.Bottom := ClientHeight + 1; {+1 is workaround for windows paint bug}
Loc.Right := ClientWidth - FButton.Width - 2;
Loc.Top := 0;
Loc.Left := 0;
SendMessage(Handle, EM_SETRECTNP, 0, LongInt(@Loc));
SendMessage(Handle, EM_GETRECT, 0, LongInt(@Loc)); {debug}
end;
procedure TSpinEdit.WMSize(var Message: TWMSize);
var
MinHeight: Integer;
begin
inherited;
MinHeight := GetMinHeight;
{ text edit bug: if size to less than minheight, then edit ctrl does
not display the text }
if Height < MinHeight then
Height := MinHeight
else if FButton <> nil then
begin
if NewStyleControls and Ctl3D then
FButton.SetBounds(Width - FButton.Width - 5, 0, FButton.Width, Height - 5)
else FButton.SetBounds (Width - FButton.Width, 1, FButton.Width, Height - 3);
SetEditRect;
end;
end;
function TSpinEdit.GetMinHeight: Integer;
var
DC: HDC;
SaveFont: HFont;
I: Integer;
SysMetrics, Metrics: TTextMetric;
begin
DC := GetDC(0);
GetTextMetrics(DC, SysMetrics);
SaveFont := SelectObject(DC, Font.Handle);
GetTextMetrics(DC, Metrics);
SelectObject(DC, SaveFont);
ReleaseDC(0, DC);
I := SysMetrics.tmHeight;
if I > Metrics.tmHeight then I := Metrics.tmHeight;
Result := Metrics.tmHeight + I div 4 + GetSystemMetrics(SM_CYBORDER) * 4 + 2;
end;
procedure TSpinEdit.UpClick (Sender: TObject);
begin
if ReadOnly then MessageBeep(0)
else Value := Value + FIncrement;
end;
procedure TSpinEdit.DownClick (Sender: TObject);
begin
if ReadOnly then MessageBeep(0)
else Value := Value - FIncrement;
end;
procedure TSpinEdit.WMPaste(var Message: TWMPaste);
begin
if not FEditorEnabled or ReadOnly then Exit;
inherited;
end;
procedure TSpinEdit.WMCut(var Message: TWMPaste);
begin
if not FEditorEnabled or ReadOnly then Exit;
inherited;
end;
procedure TSpinEdit.CMExit(var Message: TCMExit);
begin
inherited;
if CheckValue (Value) <> Value then
SetValue (Value);
end;
function TSpinEdit.GetValue: LongInt;
begin
try
Result := StrToInt (Text);
except
Result := FMinValue;
end;
end;
procedure TSpinEdit.SetValue (NewValue: LongInt);
begin
Text := IntToStr (CheckValue (NewValue));
end;
function TSpinEdit.CheckValue (NewValue: LongInt): LongInt;
begin
Result := NewValue;
if (FMaxValue <> FMinValue) then
begin
if NewValue < FMinValue then
Result := FMinValue
else if NewValue > FMaxValue then
Result := FMaxValue;
end;
end;
procedure TSpinEdit.CMEnter(var Message: TCMGotFocus);
begin
if AutoSelect and not (csLButtonDown in ControlState) then
SelectAll;
inherited;
end;
{TTimerSpeedButton}
destructor TTimerSpeedButton.Destroy;
begin
if FRepeatTimer <> nil then
FRepeatTimer.Free;
inherited Destroy;
end;
procedure TTimerSpeedButton.MouseDown(Button: TMouseButton; Shift: TShiftState;
X, Y: Integer);
begin
inherited MouseDown (Button, Shift, X, Y);
if tbAllowTimer in FTimeBtnState then
begin
if FRepeatTimer = nil then
FRepeatTimer := TTimer.Create(Self);
FRepeatTimer.OnTimer := TimerExpired;
FRepeatTimer.Interval := InitRepeatPause;
FRepeatTimer.Enabled := True;
end;
end;
procedure TTimerSpeedButton.MouseUp(Button: TMouseButton; Shift: TShiftState;
X, Y: Integer);
begin
inherited MouseUp (Button, Shift, X, Y);
if FRepeatTimer <> nil then
FRepeatTimer.Enabled := False;
end;
procedure TTimerSpeedButton.TimerExpired(Sender: TObject);
begin
FRepeatTimer.Interval := RepeatPause;
if (FState = bsDown) and MouseCapture then
begin
try
Click;
except
FRepeatTimer.Enabled := False;
raise;
end;
end;
end;
procedure TTimerSpeedButton.Paint;
var
R: TRect;
begin
inherited Paint;
if tbFocusRect in FTimeBtnState then
begin
R := Bounds(0, 0, Width, Height);
InflateRect(R, -3, -3);
if FState = bsDown then
OffsetRect(R, 1, 1);
DrawFocusRect(Canvas.Handle, R);
end;
end;
end.