Mega Code Archive
VCL for AppWide EnableDisable Remapping of Enter to Tab Key
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Title: VCL for AppWide Enable/Disable Remapping of Enter to Tab Key
Question: Component to GLOBALLY Enable/Disable Enter Key mapping as Tab Key.
The effect is application wide. (Just plonk on from and call Enable)
Both the Keyboard and Keypad Enter keys may be set individually.
They both can be set to act as either ENTER or TAB keys.
Certain components such as TMemo etc. need the Enter key, so a list of components to EXCLUDE remapping is included.
Properties
KeyboardEnterType : TEnterAsTabKeyValue (kyTab or kyEnter)
KeypadEnterType : TEnterAsTabKeyValue (kyTab or kyEnter)
ExcludeComponents : TStringList (eg Tmemo etc)
Methods
Enable Enables GLOBAL remapping of Enter Keys
Disable Disables GLOBAL remapping of Enter Keys
Many thanks to :
Odilon Nelson Grisi (for the Application.OnMessage idea)
Igor Siticov (for the Keyboard - Keypad differentiation code)
Answer:
unit EnterTab;
// ==================================================================
// Mike Heydon - mheydon@eoh.co.za
// Sep 2000
//
// Component to GLOBALLY Enable/Disable Enter Key mapping as Tab Key.
// The effect is application wide.
//
// 23/09/2000 - Modified to allow a list of components that
// do not allow ENTER - TAB ramapping
//
// Both the Keyboard and Keypad Enter keys may be set individually.
// They both can be set to act as either ENTER or TAB keys
//
// Properties
// KeyboardEnterType : TEnterAsTabKeyValue (kyTab or kyEnter)
// KeypadEnterType : TEnterAsTabKeyValue (kyTab or kyEnter)
// ExcludeComponents : TStringList (eg TMemo etc.)
//
// Methods
// Enable Enables GLOBAL remapping of Enter Keys
// Disable Disables GLOBAL remapping of Enter Keys
//
// ==================================================================
interface
uses Windows, Messages, Forms, Classes, Controls, SysUtils;
type
TEnterAsTabKeyValue = (kyTab,kyEnter);
TEnterAsTab = class(TComponent)
private
SaveOnMessage : TMessageEvent;
FExcludeComponents : TStringList;
FKBenter,
FKPenter : TEnterAsTabKeyValue;
procedure SetExcludeComponents(NewValue : TStringList);
protected
procedure DoEnterAsTab(var Msg: TMsg; var Handled: Boolean);
public
constructor Create(AOwner : TComponent); override;
destructor Destroy; override;
procedure Enable;
procedure Disable;
published
property KeyboardEnterType : TEnterAsTabKeyValue read FKBenter write FKBenter;
property KeypadEnterType : TEnterAsTabKeyValue read FKPenter write FKPenter;
property ExcludeComponents : TStringList read FExcludeComponents write SetExcludeComponents;
end;
procedure Register;
// ------------------------------------------------------------------
implementation
constructor TEnterAsTab.Create(AOwner : TComponent);
begin
inherited Create(AOwner);
FKBenter := kyTab;
FKPenter := kyTab;
FExcludeComponents := TStringList.Create;
FExcludeComponents.Add('TBitBtn');
FExcludeComponents.Add('TButton');
FExcludeComponents.Add('TDBMemo');
FExcludeComponents.Add('TDBRichEdit');
FExcludeComponents.Add('TMemo');
FExcludeComponents.Add('TRichEdit');
if not (csDesigning in ComponentState) then
SaveOnMessage := Application.OnMessage;
end;
destructor TEnterAsTab.Destroy;
begin
FExcludeComponents.Free;
end;
procedure TEnterAsTab.DoEnterAsTab(var Msg: TMsg; var Handled: Boolean);
type TEnterType = (KeyPad,KeyBoard);
var EnterType : TEnterType;
CurrControl : TWinControl;
i : integer;
Excluded : boolean;
begin
if Msg.Message = WM_KEYDOWN then begin
if Msg.wParam = VK_RETURN then begin
Excluded := false;
CurrControl := Screen.ActiveControl;
for i := 0 to FExcludeComponents.Count - 1 do begin
if UpperCase(FExcludeComponents.Strings[i]) =
UpperCase(CurrControl.ClassName) then begin
Excluded := true;
break;
end;
end;
if not Excluded then begin
if (Msg.lParam and $1000000 0) then
EnterType := KeyPad // ENTER on numeric keypad
else
EnterType := KeyBoard; // ENTER on the std keyboard
if ((FKPenter = kyTab) and (EnterType = KeyPad)) or
((FKBenter = kyTab) and (EnterType = KeyBoard)) then
Keybd_Event(VK_TAB,0,0,0);
end;
end;
end;
if Assigned(SaveOnMessage) then SaveOnMessage(Msg,Handled);
end;
procedure TEnterAsTab.SetExcludeComponents(NewValue : TStringList);
begin
FExcludeComponents.Assign(NewValue);
end;
procedure TEnterAsTab.Enable;
begin
Application.OnMessage := DoEnterAsTab;
end;
procedure TEnterAsTab.Disable;
begin
Application.OnMessage := SaveOnMessage;
end;
// ===================================
// Register to Delphi pallete
// ===================================
procedure Register;
begin
RegisterComponents('Win95', [TEnterAsTab]);
end;
end.
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