一个热键控件

unit HotKeyMgr;
{ Designed by Alexandre Guillien 11/11/1999
This component allows you to easily use hot keys in your project. These hot keys
are active even if your application is not active.
Component use :
Drop it on your Form/DataModule
Dbl click on it or Edit the HotKeys property.
In the editor, select the key and the optional shifts (Shift, Alt or Ctrl)
Give a name to the hot key (optional).
Finally, double click on the OnHotKeyActivation event in the object inspector.
The will create an event where you will be able to make your code.
E-Mail = AGuillien@csi.com
Mail : 12, rue Rhonat 69100 Villeurbanne FRANCE
}
interface
uses
Classes, Windows, Messages, Forms;
type
TShiftState = set of (ssShift, ssAlt, ssCtrl);
THotKeyManager = class;
THotKeyItem = class(TCollectionItem)
private
FHotKeyId: Integer;
FOnHotKey: TNotifyEvent;
FName: string;
{}
FHotKey: Integer;
FShiftState: TShiftState;
procedure SetShiftState(State: TShiftState);
function GetHotKey: string;
procedure SetHotKey(Key: string);
function GetManager: THotKeyManager;
protected
function GetDisplayName: string; override;
{}
procedure RegisterHotKey;
procedure UnRegisterHotKey;
{}
property HotKeyId: Integer read FHotKeyId;
property Manager: THotKeyManager read GetManager;
public
function GetNamePath: string; override;
{}
procedure Assign(Item: TPersistent); override;
published
property Name: string read FName write FName;
property ShiftState: TShiftState read FShiftState write SetShiftState;
property HotKey: string read GetHotKey write SetHotKey;
property OnHotKeyActivation: TNotifyEvent read FOnHotKey write FOnHotKey;
end;
THotKeyCollection = class(TCollection)
private
FOwner: THotKeyManager;
function GetItem(Idx: Integer): THotKeyItem;
procedure SetItem(Idx: Integer; Item: THotKeyItem);
protected
function GetOwner: TPersistent; override;
public
constructor Create(Manager: THotKeyManager);
{}
property Items[Idx: Integer]: THotKeyItem read GetItem write SetItem; default;
end;
THotKeyManager = class(TComponent)
private
FHotKeys: THotKeyCollection;
procedure SetHotKeys(HotKeys: THotKeyCollection);
{}
function WMHotKey(var Msg: TMessage): Boolean;
protected
procedure Loaded; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
{}
function HotKeyByName(const Name: string): THotKeyItem;
published
property HotKeys: THotKeyCollection read FHotKeys write SetHotKeys;
end;
procedure Register;
implementation
uses SysUtils, DsgnIntf, TypInfo;
const
KeyCodes: array[0..60] of Integer =
(0,
Ord('A'), Ord('B'), Ord('C'), Ord('D'), Ord('E'), Ord('F'), Ord('G'), Ord('H'),
Ord('I'), Ord('J'), Ord('K'), Ord('L'), Ord('M'), Ord('N'), Ord('O'), Ord('P'),
Ord('Q'), Ord('R'), Ord('S'), Ord('T'), Ord('U'), Ord('V'), Ord('W'), Ord('X'),
Ord('Y'), Ord('Z'),
Ord('1'), Ord('2'), Ord('3'), Ord('4'), Ord('5'), Ord('6'), Ord('7'), Ord('8'),
Ord('9'), Ord('0'),
VK_F1, VK_F2, VK_F3, VK_F4, VK_F5, VK_F6, VK_F7, VK_F8, VK_F9, VK_F10, VK_F11, VK_F12,
VK_UP, VK_DOWN, VK_LEFT, VK_RIGHT, VK_ESCAPE, VK_TAB, VK_INSERT, VK_DELETE,
VK_HOME, VK_END, VK_PRIOR, VK_NEXT);
KeyLabels: array[0..60] of string =
('',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z',
'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
'F1', 'F2', 'F3', 'F4', 'F5', 'F6', 'F7', 'F8', 'F9', 'F10', 'F11', 'F12',
'Up', 'Down', 'Left', 'Right', 'Echap', 'Tab', 'Insert', 'Delete',
'Home', 'End', 'Page up', 'Page down');
function THotKeyManager.WMHotKey(var Msg: TMessage): Boolean;
var i: Integer;
begin
for i:= 0 to HotKeys.Count - 1 do
if Msg.wParam = HotKeys.HotKeyId then
begin
Result:= True;
if Assigned(HotKeys.OnHotKeyActivation) then
HotKeys.OnHotKeyActivation(HotKeys);
Exit;
end;
Result:= False;
end;
constructor THotKeyManager.Create(AOwner: TComponent);
begin
FHotKeys:= THotKeyCollection.Create(Self);
inherited Create(AOwner);
if not (csDesigning in ComponentState) then
Application.HookMainWindow(WMHotKey);
end;
destructor THotKeyManager.Destroy;
var i: Integer;
begin
if not (csDesigning in ComponentState) then
Application.UnHookMainWindow(WMHotKey);
for i:= 0 to HotKeys.Count - 1 do
HotKeys.UnRegisterHotKey;
FHotKeys.Free; FHotKeys:= nil;
inherited Destroy;
end;
procedure THotKeyManager.Loaded;
var i: Integer;
begin
inherited Loaded;
if not (csDesigning in ComponentState) then
for i:= 0 to HotKeys.Count - 1 do
HotKeys.RegisterHotKey;
end;
function THotKeyManager.HotKeyByName(const Name: string): THotKeyItem;
var i: Integer;
begin
for i:= 0 to HotKeys.Count - 1 do
if CompareText(Name, HotKeys.Name) = 0 then
begin
Result:= HotKeys;
Exit;
end;
Result:= nil;
end;
procedure THotKeyManager.SetHotKeys(HotKeys: THotKeyCollection);
begin
FHotKeys.Assign(HotKeys);
end;
{ THotKeyCollection }
constructor THotKeyCollection.Create(Manager: THotKeyManager);
begin
FOwner:= Manager;
inherited Create(THotKeyItem);
end;
function THotKeyCollection.GetItem(Idx: Integer): THotKeyItem;
begin
Result:= THotKeyItem(inherited Items[Idx]);
end;
function THotKeyCollection.GetOwner: TPersistent;
begin
Result:= FOwner;
end;
procedure THotKeyCollection.SetItem(Idx: Integer; Item: THotKeyItem);
begin
inherited Items[Idx]:= Item;
end;
{ THotKeyItem }
procedure THotKeyItem.RegisterHotKey;
var Shift: Integer;
Key: Integer;
begin
if FHotKeyId <> 0 then
UnRegisterHotKey;
if FHotKey <> 0 then
begin
Shift:= 0;
if ssAlt in ShiftState then
Shift:= Shift + MOD_ALT;
if ssCtrl in ShiftState then
Shift:= Shift + MOD_CONTROL;
if ssShift in ShiftState then
Shift:= Shift + MOD_SHIFT;
Key:= KeyCodes[FHotKey];
FHotKeyId:= $A000 + ID;
Windows.RegisterHotKey(Application.Handle, FHotKeyId, Shift, Key);
end;
end;
procedure THotKeyItem.UnRegisterHotKey;
begin
if FHotKeyId <> 0 then
begin
Windows.UnRegisterHotKey(Application.Handle, FHotKeyId);
FHotKeyId:= 0;
end;
end;
procedure THotKeyItem.Assign(Item: TPersistent);
begin
if Item is THotKeyItem then
begin
HotKey:= THotKeyItem(Item).HotKey;
ShiftState:= THotKeyItem(Item).ShiftState;
end else
inherited Assign(Item);
end;
function THotKeyItem.GetDisplayName: string;
procedure AddShift(const S: string);
begin
if Result <> '' then
Result:= Result + ' + ';
Result:= Result + S;
end;
begin
if HotKey = '' then
Result:= inherited GetDisplayName
else if Name <> '' then
Result:= Name
else begin
if ssAlt in ShiftState then
AddShift('Alt');
if ssCtrl in ShiftState then
AddShift('Ctrl');
if ssShift in ShiftState then
AddShift('Shift');
AddShift(HotKey);
end;
end;
function THotKeyItem.GetNamePath: string;
begin
if Collection <> nil then
begin
if Name <> '' then
Result:= Format('%s[%s]',[Collection.GetNamePath, Name])
else
Result:= Format('%s[%d]',[Collection.GetNamePath, Index]);
end else
Result:= ClassName;
end;
function THotKeyItem.GetHotKey: string;
begin
Result:= KeyLabels[FHotKey];
end;
procedure THotKeyItem.SetHotKey(Key: string);
var i: Integer;
begin
i:= 0;
while i < High(KeyLabels) do
begin
Inc(i);
if CompareText(Key, KeyLabels) = 0 then
Break;
end;
if i > High(KeyLabels) then
i:= 0;
FHotKey:= i;
if not (csDesigning in Manager.ComponentState) then
RegisterHotKey;
end;
procedure THotKeyItem.SetShiftState(State: TShiftState);
begin
FShiftState:= State;
if not (csDesigning in Manager.ComponentState) then
RegisterHotKey;
end;
function THotKeyItem.GetManager: THotKeyManager;
begin
Result:= THotKeyCollection(Collection).FOwner;
end;
{ PropEditors }
type
THotKeyProperty = class(TStringProperty)
public
function GetAttributes: TPropertyAttributes; override;
procedure GetValues(Proc: TGetStrProc); override;
end;
function THotKeyProperty.GetAttributes: TPropertyAttributes;
begin
Result:= [paValueList, paMultiSelect];
end;
procedure THotKeyProperty.GetValues(Proc: TGetStrProc);
var i: Integer;
begin
for i:= 1 to High(KeyLabels) do
Proc(KeyLabels);
end;
type
THotKeyManagerEditor = class(TComponentEditor)
protected
procedure GetPropEdit(Editor: TPropertyEditor);
public
procedure Edit; override;
end;
procedure THotKeyManagerEditor.GetPropEdit(Editor: TPropertyEditor);
begin
if Editor.GetName = 'HotKeys' then
Editor.Edit;
end;
procedure THotKeyManagerEditor.Edit;
var L: TDesignerSelectionList;
begin
L:= TDesignerSelectionList.Create;
try
L.Add(Component);
GetComponentProperties(L, [tkClass], Designer, GetPropEdit);
finally
L.Free;
end;
end;
procedure Register;
begin
RegisterComponents('ExtComps', [THotKeyManager]);
RegisterPropertyEditor(TypeInfo(string), THotKeyItem, 'HotKey', THotKeyProperty);
RegisterComponentEditor(THotKeyManager, THotKeyManagerEditor);
end;
end.