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StdCtrls.pas
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StdCtrls.pas
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unit StdCtrls;
{
LVCL - Very LIGHT VCL routines
------------------------------
Tiny replacement for the standard VCL StdCtrls.pas
Just put the LVCL directory in your Project/Options/Path/SearchPath
and your .EXE will shrink from 300KB to 30KB
Notes:
- implements TButton+TCheckBox+TEdit+TLabel+TMemo
- for TMemo: use global Text property, as there's no Lines[] property;
don't set anything in Lines property in IDE
- compatible with the standard .DFM files.
- only use existing properties in your DFM, otherwise you'll get error on startup
(no Anchor, e.g.)
The contents of this file are subject to the Mozilla Public License
Version 1.1 (the "License"); you may not use this file except in
compliance with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL
Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
License for the specific language governing rights and limitations
under the License.
The Initial Developer of the Original Code is Arnaud Bouchez.
This work is Copyright (C) 2008 Arnaud Bouchez - http://bouchez.info
Emulates the original Delphi/Kylix Cross-Platform Runtime Library
(c)2000,2001 Borland Software Corporation
Portions created by Paul Toth are Copyright (C) 2001 Paul Toth. http://tothpaul.free.fr
All Rights Reserved.
Some modifications by Leonid Glazyrin, Feb 2012 <leonid.glazyrin@gmail.com>
* TCheckBox: new properties: 'Alignment', 'State', 'AllowGrayed' (3-states style)
* TRadioButton (auto-switching and groups not implemented)
* TGroupBox
* TListBox, TComboBox (and parent TCustomBox)
}
{$WARNINGS OFF}
{$HINTS ON}
{$IF CompilerVersion >= 24.00}
{$ZEROBASEDSTRINGS OFF}
{$IFEND}
interface
uses
Windows, Messages, Classes, Controls, SysUtils, Graphics;
type
TLabel = class(TGraphicControl)
protected
procedure SetCaption(const Value: string);
public
procedure Paint; override;
property Caption: string read fCaption write SetCaption;
end;
TButton = class(TWinControl)
protected
procedure CreateHandle; override;
public
constructor Create(AOwner: TComponent); override;
end;
TEdit = class(TWinControl)
private
fText: string;
fPassWordChar: char;
fReadOnly: boolean;
protected
CreateFlags: cardinal;
procedure ReadProperty(const Name: string; Reader: TReader); override;
procedure CreateHandle; override;
function GetText: string;
procedure SetText(const Value: string); override;
public
procedure SetReadOnly(Value: Boolean);
procedure SelectAll;
procedure AddLine(const s: string; AddEOLN: boolean = true);
procedure AddLineFmt(const s: string; const Args: array of const; AddEOLN: boolean = true);
property Text: string read GetText write SetText;
property ReadOnly: boolean read fReadOnly write SetReadOnly;
end;
TMemo = class(TEdit)
protected
procedure CreateHandle; override;
end;
TAlignment = (taRightJustify, taLeftJustify); // default = 0 = taRightJustify
TCheckBoxState = (cbUnchecked, cbChecked, cbGrayed);
TCheckBox = class(TWinControl)
private
fState: TCheckBoxState;
fAllowGrayed: boolean;
fAlignment: TAlignment;
procedure SetChecked(const Value: boolean);
function GetChecked: boolean;
procedure SetState(const Value: TCheckBoxState);
procedure SetAllowGrayed(Value: boolean);
function GetState: TCheckBoxState;
protected
procedure CreateHandle; override;
procedure ReadProperty(const Name: string; Reader: TReader); override;
public
property Checked: boolean read GetChecked write SetChecked;
property State: TCheckBoxState read GetState write SetState;
property AllowGrayed: boolean read fAllowGrayed write SetAllowGrayed;
end;
TRadioButton = class(TCheckBox) //should be vice versa
protected
procedure CreateHandle; override;
end;
TGroupBox = class(TWinControl)
protected
procedure CreateHandle; override;
end;
TCustomBox = class;
TBoxStrings = class(TPersistent)
protected
fBox: TCustomBox;
fStrings: TStringList;
procedure SetStrings(StringList: TStrings);
procedure ReadProperty(const Name: string; Reader: TReader); override;
function GetItem(n: Integer): string;
public
constructor Create(Box: TCustomBox);
destructor Destroy; override;
function Add(const S: String): Integer;
procedure Clear;
property Strings: TStrings read fStrings write SetStrings;
property Items[n: integer]: string read GetItem; default;
end;
TCustomBox = class(TWinControl)
protected
fWinClass: string;
fCreateParams: cardinal;
fAddLineMsg: cardinal;
fResetMsg: cardinal;
fGetIndexMsg: cardinal;
fGetCountMsg: cardinal;
fDropDownHeight: integer;
fItems: TBoxStrings;
fItemIndex: Integer;
fSorted: Boolean;
function GetItems: TStrings;
procedure SetItems(AItems: TStrings);
function GetCount: Integer; virtual;
function GetItemIndex: Integer; virtual;
procedure SetItemIndex(const Value: Integer); virtual;
procedure CreateHandle; override;
procedure ReadProperty(const Name: string; Reader: TReader); override;
function SubProperty(const Name: string): TPersistent; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property ItemIndex: Integer read GetItemIndex write SetItemIndex default -1;
property Items: TBoxStrings read fItems;
property ItemCount: Integer read GetCount;
property ItemStrings: TStrings read GetItems write SetItems;
end;
TComboBoxStyle =
(csDropDown, csSimple, csDropDownList, csOwnerDrawFixed, csOwnerDrawVariable);
TComboBox = class(TCustomBox)
protected
fText: string;
fStyle: TComboBoxStyle;
fOnChange: TNotifyEvent;
procedure WMCommand(var msg: TWMCommand); message WM_COMMAND;
procedure ReadProperty(const Name: string; Reader: TReader); override;
function GetText: string;
procedure SetText(const Value: string); override;
procedure CreateHandle; override;
function GetDroppedDown: Boolean;
procedure SetDroppedDown(Value: Boolean);
public
property Text: string read GetText write SetText;
property OnChange: TNotifyEvent read fOnChange write fOnChange;
property DroppedDown: Boolean read GetDroppedDown write SetDroppedDown;
end;
TListBox = class(TCustomBox)
procedure CreateHandle; override;
end;
implementation
{ TButton }
constructor TButton.Create(AOwner:TComponent);
begin
inherited;
fTransparent := True; // do not use color
end;
procedure TButton.CreateHandle;
begin
Handle := CreateWindow(
'BUTTON',
pointer(fCaption),
WS_CHILD or WS_CLIPCHILDREN or WS_TABSTOP,
fLeft,fTop,fWidth,fHeight,
Parent.Handle,
0,
hInstance,
nil
);
if not fVisible then
ShowWindow(Handle,SW_HIDE);
end;
{ TEdit }
procedure TEdit.CreateHandle;
begin
Color := clWhite;
if CreateFlags=0 then begin
CreateFlags := WS_CHILD or WS_CLIPCHILDREN or WS_TABSTOP
or ES_AUTOHSCROLL or ES_AUTOVSCROLL;
if fPassWordChar='*' then
CreateFlags := CreateFlags or ES_PASSWORD;
end;
Handle := CreateWindowEx(
WS_EX_CONTROLPARENT or WS_EX_CLIENTEDGE,
'EDIT',
pointer(fCaption),
CreateFlags,
fLeft,fTop,fWidth,fHeight,
Parent.Handle,
0,
hInstance,
nil
);
SendMessage(Handle,WM_SETTEXT,0,integer(fText));
if not fVisible then
ShowWindow(Handle,SW_HIDE);
if fReadOnly then
SendMessage(fHandle, EM_SETREADONLY, 1, 0);
end;
function TEdit.GetText: string;
var i: integer;
begin
i := SendMessage(fHandle,WM_GETTEXTLENGTH,0,0);
if i=0 then
result := '' else begin
SetLength(result,i);
SetLength(result,SendMessage(fHandle,WM_GETTEXT,i+1,integer(result)));
end;
end;
procedure TEdit.ReadProperty(const Name: string; Reader: TReader);
const Properties: array[0..1] of PChar=(
'PasswordChar','ReadOnly');
var tmp: string;
begin
case StringIndex(Name,Properties) of
0: begin
tmp := Reader.StringProperty;
if tmp<>'' then
fPassWordChar := tmp[1];
end;
1: fReadOnly := Reader.BooleanProperty;
else inherited;
end;
end;
procedure TEdit.SelectAll;
begin
if fHandle<>0 then
SendMessage(fHandle, EM_SETSEL, 0, -1);
end;
procedure TEdit.SetReadOnly(Value: Boolean);
begin
HandleNeeded;
if fHandle<>0 then
SendMessage(fHandle, EM_SETREADONLY, Ord(Value), 0);
fReadOnly := Value;
end;
procedure TEdit.SetText(const Value: string);
begin
fText := Value;
if fHandle<>0 then
SendMessage(fHandle,WM_SETTEXT,0,integer(Value));
end;
procedure TEdit.AddLine(const s: string; AddEOLN: boolean=true);
var len: integer;
str: string;
begin
HandleNeeded;
len := SendMessage(fHandle, WM_GETTEXTLENGTH, 0, 0);
if AddEOLN and (len>0) then
str := #13#10+s else
str := s;
SendMessage(fHandle, EM_SETSEL, len, len);
SendMessage(fHandle, EM_REPLACESEL, 0, integer(str));
end;
procedure TEdit.AddLineFmt(const s: string; const Args: array of const; AddEOLN: boolean = true);
begin
AddLine(Format(s, Args), AddEOLN);
end;
{ TMemo }
procedure TMemo.CreateHandle;
begin
CreateFlags := WS_VISIBLE or
WS_CHILD or ES_MULTILINE or ES_WANTRETURN or ES_AUTOVSCROLL or WS_VSCROLL;
inherited;
end;
{ TCheckBox }
const
AlignStyle: array [TAlignment] of Cardinal = (0, BS_LEFTTEXT);
GrayStyle: array [Boolean] of Cardinal = (BS_AUTOCHECKBOX, BS_AUTO3STATE);
procedure TCheckBox.CreateHandle;
begin
Handle := CreateWindowEx(
WS_EX_CONTROLPARENT,
'BUTTON',
pointer(fCaption),
WS_VISIBLE or WS_CHILD or WS_TABSTOP or GrayStyle[fAllowGrayed] or AlignStyle[fAlignment],
fLeft,fTop,fWidth,fHeight,
Parent.Handle,
0,
hInstance,
nil
);
State := fState;
if not fVisible then
ShowWindow(Handle,SW_HIDE);
end;
procedure TRadioButton.CreateHandle;
begin
Handle := CreateWindowEx(
WS_EX_CONTROLPARENT,
'BUTTON',
pointer(fCaption),
WS_VISIBLE or WS_CHILD or BS_RADIOBUTTON or WS_TABSTOP or AlignStyle[fAlignment],
fLeft,fTop,fWidth,fHeight,
Parent.Handle,
0,
hInstance,
nil
);
SendMessage(Handle, BM_SETCHECK, integer(fState), 0);
if not fVisible then
ShowWindow(Handle,SW_HIDE);
end;
function TCheckBox.GetChecked: boolean;
begin
result := Boolean(GetState);
end;
function TCheckBox.GetState: TCheckBoxState;
begin
result := TCheckBoxState(SendMessage(Handle,BM_GETCHECK,0,0));
end;
procedure TCheckBox.ReadProperty(const Name: string; Reader: TReader);
const Properties: array[0..3] of PChar=(
'Checked', 'Alignment', 'State', 'AllowGrayed');
var b: Boolean;
begin
case StringIndex(Name,Properties) of
0 : begin
b := Reader.BooleanProperty;
if fState<>cbGrayed then
fState := TCheckBoxState(b);
end;
1: Reader.IdentProperty(fAlignment,TypeInfo(TAlignment));
2: Reader.IdentProperty(fState,TypeInfo(TCheckBoxState));
3: fAllowGrayed := Reader.BooleanProperty;
else inherited;
end;
end;
procedure TCheckBox.SetChecked(const Value: boolean);
begin
SetState(TCheckBoxState(Value));
end;
procedure TCheckBox.SetState(const Value: TCheckBoxState);
begin
if self=nil then exit;
HandleNeeded;
if (Value = cbGrayed) and not fAllowGrayed then
begin
SetAllowGrayed(True); // need to set Grayed state
SendMessage(Handle, BM_SETCHECK, integer(Value), 0);
SetAllowGrayed(False); // style switches back, but state persists!
end
else
SendMessage(Handle, BM_SETCHECK, integer(Value), 0);
end;
procedure TCheckBox.SetAllowGrayed(Value: boolean);
var i: Integer;
const StyleMask = $F;
begin
if fAllowGrayed = Value then Exit;
fAllowGrayed := Value;
i:= GetWindowLong(fHandle, GWL_STYLE);
//if (i and StyleMask)<>GrayStyle[fAllowGrayed] then //no need to check
// switch between 2-state and 3-state CheckBox autoswitching style
SetWindowLong(fHandle, GWL_STYLE, i and not StyleMask or GrayStyle[fAllowGrayed]);
end;
{ TGroupBox }
procedure TGroupBox.CreateHandle;
begin
Color:= Parent.Color;
Handle := CreateWindowEx(
WS_EX_CONTROLPARENT,
'BUTTON',
pointer(fCaption),
WS_VISIBLE or WS_CHILD or BS_GROUPBOX or WS_TABSTOP,
fLeft,fTop,fWidth,fHeight,
Parent.Handle,
0,
hInstance,
nil
);
if not fVisible then
ShowWindow(Handle,SW_HIDE);
end;
{ TLabel }
procedure TLabel.Paint;
var R: TRect;
begin
R := ClientRect;
with Canvas do begin
Font.Assign(Self.Font);
if fTransparent then
Brush.Style := bsClear else begin
Brush.Color := Parent.Color;
FillRect(R);
end;
if fVisible then begin
PrepareText;
DrawText(Handle, pointer(fCaption), length(fCaption), R,
DT_LEFT or DT_NOPREFIX or DT_WORDBREAK);
end;
end;
end;
procedure TLabel.SetCaption(const Value: string);
var Redraw: boolean;
begin
Redraw := (fCaption<>Value);
fCaption := Value;
if Redraw then // avoid flicker
Invalidate;
end;
{ TBoxStrings }
constructor TBoxStrings.Create(Box: TCustomBox);
begin
inherited Create;
fStrings:= TStringList.Create;
fBox:= Box;
end;
destructor TBoxStrings.Destroy;
begin
fStrings.Free;
inherited;
end;
function TBoxStrings.Add(const S: String): Integer;
begin
fStrings.Add(S);
result := SendMessage(fBox.Handle, fBox.fAddLineMsg, 0, integer(S));
if result<0 then
raise Exception.Create('InsertLineError');
end;
procedure TBoxStrings.Clear;
begin
fStrings.Clear;
SendMessage(fBox.Handle, fBox.fResetMsg, 0, 0);
end;
procedure TBoxStrings.SetStrings(StringList: TStrings);
// seems to be very unoptimal, but there's no TStringList.Assign !
var i: Integer;
begin
if StringList = fStrings then Exit;
Clear;
for i := 0 to StringList.Count-1 do
Add(StringList[i]);
end;
function TBoxStrings.GetItem(n: Integer): string;
begin
Result := fStrings[n];
end;
procedure TBoxStrings.ReadProperty(const Name: string; Reader: TReader);
const Properties: array[0..0] of PChar=('Strings');
begin
case StringIndex(Name,Properties) of
0 : Reader.ReadStrings(fStrings);
else inherited;
end;
end;
{ TCustomBox }
constructor TCustomBox.Create(AOwner: TComponent);
begin
inherited;
fItems := TBoxStrings.Create(Self);
fItemIndex:= -1;
end;
procedure TCustomBox.CreateHandle;
var i: Integer;
begin
Handle := CreateWindowEx(
WS_EX_CONTROLPARENT,
pointer(fWinClass),
pointer(fCaption),
fCreateParams,
fLeft,fTop,fWidth,fHeight+fDropDownHeight,
Parent.Handle,
0,
hInstance,
nil
);
for i:= 0 to fItems.Strings.Count - 1 do
SendMessage(FHandle, fAddLineMsg, 0, integer(fItems.Strings[i]));
SetItemIndex(fItemIndex);
if not fVisible then
ShowWindow(FHandle, SW_HIDE);
end;
//TComboBoxStyle = (csDropDown, csSimple, csDropDownList, csOwnerDrawFixed, csOwnerDrawVariable);
const ComboBoxStyleFlag: array[TComboBoxStyle] of Cardinal =
(CBS_DROPDOWN, CBS_SIMPLE, CBS_DROPDOWNLIST, CBS_OWNERDRAWFIXED, CBS_OWNERDRAWVARIABLE);
procedure TComboBox.CreateHandle;
begin
fWinClass := 'COMBOBOX';
fCreateParams := WS_VISIBLE or WS_CHILD or WS_TABSTOP or WS_VSCROLL or LBS_NOINTEGRALHEIGHT;
fAddLineMsg := CB_ADDSTRING;
fResetMsg := CB_RESETCONTENT;
fGetIndexMsg:= CB_GETCURSEL;
fGetCountMsg:= CB_GETCOUNT;
if fSorted then
fCreateParams := fCreateParams or CBS_SORT;
fCreateParams := fCreateParams or ComboBoxStyleFlag[fStyle];
if fStyle<>csSimple then
fDropDownHeight:= 400; // maybe, not the best solution?!?
Color:= Parent.Color;
inherited;
SendMessage(fHandle, WM_SETTEXT, 0, integer(fText));
end;
procedure TListBox.CreateHandle;
begin
fWinClass := 'LISTBOX';
fCreateParams := WS_VISIBLE or WS_CHILD or WS_TABSTOP or WS_VSCROLL
or WS_BORDER or LBS_HASSTRINGS or LBS_NOINTEGRALHEIGHT;
fAddLineMsg := LB_ADDSTRING;
fResetMsg := LB_RESETCONTENT;
fGetIndexMsg:= LB_GETCURSEL;
fGetCountMsg:= LB_GETCOUNT;
if fSorted then
fCreateParams := fCreateParams or LBS_SORT;
Color:= clWhite;
inherited;
end;
procedure TComboBox.WMCommand(var msg: TWMCommand);
begin
inherited;
case msg.NotifyCode of
CBN_SELCHANGE:
if Assigned(fOnChange) then
fOnChange(Self);
end;
end;
destructor TCustomBox.Destroy;
begin
fItems.Free;
inherited;
end;
function TCustomBox.GetItems: TStrings;
begin
Result:= fItems.Strings;
end;
procedure TCustomBox.SetItems(AItems: TStrings);
begin
fItems.Strings:= AItems;
end;
function TCustomBox.GetCount: Integer;
begin
Result := SendMessage(FHandle, fGetCountMsg, 0, 0);
Assert(Result = fItems.Strings.Count);
end;
function TCustomBox.GetItemIndex: Integer;
begin
Result := SendMessage(FHandle, fGetIndexMsg, 0, 0);
end;
procedure TCustomBox.SetItemIndex(const Value: Integer);
begin
fItemIndex := Value;
if GetItemIndex<>Value then
SendMessage(FHandle, CB_SETCURSEL, Value, 0);
end;
procedure TCustomBox.ReadProperty(const Name: string; Reader: TReader);
const Properties: array[0..1] of PChar=('ItemIndex', 'Sorted');
begin
case StringIndex(Name,Properties) of
0 : fItemIndex := Reader.IntegerProperty;
1 : fSorted := Reader.BooleanProperty;
else inherited;
end;
end;
procedure TComboBox.ReadProperty(const Name: string; Reader: TReader);
const Properties: array[0..1] of PChar=('OnChange', 'Style');
begin
case StringIndex(Name,Properties) of
0 : TMethod(fOnChange) := FindMethod(Reader);
1 : Reader.IdentProperty(fStyle, TypeInfo(TComboBoxStyle));
else inherited;
end;
end;
function TCustomBox.SubProperty(const Name:string): TPersistent;
const
TCustomBoxSubProperties:array[0..0] of PChar=('Items');
begin
case StringIndex(Name, TCustomBoxSubProperties) of
0 : result := fItems;
else result := inherited SubProperty(Name);
end;
end;
function TComboBox.GetText: string;
var i: integer;
begin
i := SendMessage(fHandle,WM_GETTEXTLENGTH,0,0);
if i=0 then
result := '' else begin
SetLength(result,i);
SetLength(result,SendMessage(fHandle,WM_GETTEXT,i+1,integer(result)));
end;
end;
procedure TComboBox.SetText(const Value: string);
begin
fText := Value;
if fHandle<>0 then
SendMessage(fHandle,WM_SETTEXT,0,integer(Value));
end;
function TComboBox.GetDroppedDown: Boolean;
begin
Result := LongBool(SendMessage(Handle, CB_GETDROPPEDSTATE, 0, 0));
end;
procedure TComboBox.SetDroppedDown(Value: Boolean);
var
R: TRect;
begin
SendMessage(Handle, CB_SHOWDROPDOWN, ord(Value), 0);
R := ClientRect;
InvalidateRect(Handle, @R, True);
end;
const
Classes: array[0..8] of TPersistentClass =
(TLabel, TButton, TEdit, TCheckBox, TRadioButton, TGroupBox, TMemo,
TComboBox, TListBox);
initialization
RegisterClasses(Classes);
end.