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NewCheckListBox.pas
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unit NewCheckListBox;
{ TNewCheckListBox by Martijn Laan for Inno Setup
Based on TPBCheckListBox by Patrick Brisacier and TCheckListBox by Borland
Group item support, child item support, exclusive item support,
ShowLines support and 'WantTabs mode' by Alex Yackimoff.
Note: TNewCheckListBox uses Items.Objects to store the item state. Don't use
Item.Objects yourself, use ItemObject instead.
}
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, UxThemeISX;
const
WM_UPDATEUISTATE = $0128;
type
TItemType = (itGroup, itCheck, itRadio);
TCheckBoxState2 = (cb2Normal, cb2Hot, cb2Pressed, cb2Disabled);
TItemState = class (TObject)
public
Enabled: Boolean;
HasInternalChildren: Boolean;
CheckWhenParentChecked: Boolean;
IsLastChild: Boolean;
ItemType: TItemType;
Level: Byte;
Obj: TObject;
State: TCheckBoxState;
SubItem: string;
ThreadCache: set of Byte;
MeasuredHeight: Integer;
end;
TCheckItemOperation = (coUncheck, coCheck, coCheckWithChildren);
TEnumChildrenProc = procedure(Index: Integer; HasChildren: Boolean; Ext: Longint) of object;
TNewCheckListBox = class (TCustomListBox)
private
FAccObjectInstance: TObject;
FCaptureIndex: Integer;
FSpaceDown: Boolean;
FCheckHeight: Integer;
FCheckWidth: Integer;
FFormFocusChanged: Boolean;
FFlat: Boolean;
FLastMouseMoveIndex: Integer;
FMinItemHeight: Integer;
FOffset: Integer;
FOnClickCheck: TNotifyEvent;
FRequireRadioSelection: Boolean;
FShowLines: Boolean;
FStateList: TList;
FWantTabs: Boolean;
FThemeData: HTHEME;
FThreadsUpToDate: Boolean;
FHotIndex: Integer;
FDisableItemStateDeletion: Integer;
FWheelAccum: Integer;
FUseRightToLeft: Boolean;
procedure UpdateThemeData(const Close, Open: Boolean);
function CanFocusItem(Item: Integer): Boolean;
function CheckPotentialRadioParents(Index, ALevel: Integer): Boolean;
procedure CMDialogChar(var Message: TCMDialogChar); message CM_DIALOGCHAR;
procedure CMEnter(var Message: TCMEnter); message CM_ENTER;
procedure CMExit(var Message: TCMExit); message CM_EXIT;
procedure CMFocusChanged(var Message: TCMFocusChanged); message CM_FOCUSCHANGED;
procedure CMFontChanged(var Message: TMessage); message CM_FONTCHANGED;
procedure CMWantSpecialKey(var Message: TMessage); message CM_WANTSPECIALKEY;
procedure CNDrawItem(var Message: TWMDrawItem); message CN_DRAWITEM;
procedure EndCapture(Cancel: Boolean);
function AddItem2(AType: TItemType; const ACaption, ASubItem: string;
ALevel: Byte; AChecked, AEnabled, AHasInternalChildren,
ACheckWhenParentChecked: Boolean; AObject: TObject): Integer;
function FindAccel(VK: Word): Integer;
function FindCheckedSibling(const AIndex: Integer): Integer;
function FindNextItem(StartFrom: Integer; GoForward,
SkipUncheckedRadios: Boolean): Integer;
function GetItemState(Index: Integer): TItemState;
procedure InvalidateCheck(Index: Integer);
function RemeasureItem(Index: Integer): Integer;
procedure Toggle(Index: Integer);
procedure UpdateScrollRange;
procedure LBDeleteString(var Message: TMessage); message LB_DELETESTRING;
procedure LBResetContent(var Message: TMessage); message LB_RESETCONTENT;
procedure WMGetDlgCode(var Message: TWMGetDlgCode); message WM_GETDLGCODE;
procedure WMGetObject(var Message: TMessage); message $003D; //WM_GETOBJECT
procedure WMKeyDown(var Message: TWMKeyDown); message WM_KEYDOWN;
procedure WMMouseMove(var Message: TWMMouseMove); message WM_MOUSEMOVE;
procedure WMMouseWheel(var Message: TMessage); message $020A; //WM_MOUSEWHEEL
procedure WMNCHitTest(var Message: TWMNCHitTest); message WM_NCHITTEST;
procedure WMSetFocus(var Message: TWMSetFocus); message WM_SETFOCUS;
procedure WMSize(var Message: TWMSize); message WM_SIZE;
procedure WMThemeChanged(var Message: TMessage); message WM_THEMECHANGED;
procedure WMUpdateUIState(var Message: TMessage); message WM_UPDATEUISTATE;
protected
procedure CreateParams(var Params: TCreateParams); override;
procedure CreateWnd; override;
procedure MeasureItem(Index: Integer; var Height: Integer); override;
procedure DrawItem(Index: Integer; Rect: TRect; State: TOwnerDrawState);
override;
function GetCaption(Index: Integer): String;
function GetChecked(Index: Integer): Boolean;
function GetItemEnabled(Index: Integer): Boolean;
function GetLevel(Index: Integer): Byte;
function GetObject(Index: Integer): TObject;
function GetState(Index: Integer): TCheckBoxState;
function GetSubItem(Index: Integer): string;
procedure KeyDown(var Key: Word; Shift: TShiftState); override;
procedure KeyUp(var Key: Word; Shift: TShiftState); override;
procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
procedure UpdateHotIndex(NewHotIndex: Integer);
procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
procedure SetCaption(Index: Integer; const Value: String);
procedure SetChecked(Index: Integer; const AChecked: Boolean);
procedure SetFlat(Value: Boolean);
procedure SetItemEnabled(Index: Integer; const AEnabled: Boolean);
procedure SetObject(Index: Integer; const AObject: TObject);
procedure SetOffset(AnOffset: Integer);
procedure SetShowLines(Value: Boolean);
procedure SetSubItem(Index: Integer; const ASubItem: String);
property ItemStates[Index: Integer]: TItemState read GetItemState;
public
constructor Create(AOwner: TComponent); override;
procedure CreateWindowHandle(const Params: TCreateParams); override;
destructor Destroy; override;
function AddCheckBox(const ACaption, ASubItem: string; ALevel: Byte;
AChecked, AEnabled, AHasInternalChildren, ACheckWhenParentChecked: Boolean;
AObject: TObject): Integer;
function AddGroup(const ACaption, ASubItem: string; ALevel: Byte;
AObject: TObject): Integer;
function AddRadioButton(const ACaption, ASubItem: string;
ALevel: Byte; AChecked, AEnabled: Boolean; AObject: TObject): Integer;
function CheckItem(const Index: Integer; const AOperation: TCheckItemOperation): Boolean;
procedure EnumChildrenOf(Item: Integer; Proc: TEnumChildrenProc; Ext: Longint);
function GetParentOf(Item: Integer): Integer;
procedure UpdateThreads;
property Checked[Index: Integer]: Boolean read GetChecked write SetChecked;
property ItemCaption[Index: Integer]: String read GetCaption write SetCaption;
property ItemEnabled[Index: Integer]: Boolean read GetItemEnabled write SetItemEnabled;
property ItemLevel[Index: Integer]: Byte read GetLevel;
property ItemObject[Index: Integer]: TObject read GetObject write SetObject;
property ItemSubItem[Index: Integer]: string read GetSubItem write SetSubItem;
property State[Index: Integer]: TCheckBoxState read GetState;
published
property Align;
property Anchors;
property BorderStyle;
property Color;
property Ctl3D;
property DragCursor;
property DragMode;
property Enabled;
property Flat: Boolean read FFlat write SetFlat default False;
property Font;
property Items;
property MinItemHeight: Integer read FMinItemHeight write FMinItemHeight default 16;
property Offset: Integer read FOffset write SetOffset default 4;
property OnClick;
property OnClickCheck: TNotifyEvent read FOnClickCheck write FOnClickCheck;
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;
property ParentColor;
property ParentCtl3D;
property ParentFont;
property ParentShowHint;
property PopupMenu;
property RequireRadioSelection: Boolean read FRequireRadioSelection write FRequireRadioSelection default False;
property ShowHint;
property ShowLines: Boolean read FShowLines write SetShowLines default True;
property TabOrder;
property Visible;
property WantTabs: Boolean read FWantTabs write FWantTabs default False;
end;
procedure Register;
implementation
uses
TmSchemaISX, PathFunc, ActiveX, BidiUtils, Types;
const
sRadioCantHaveDisabledChildren = 'Radio item cannot have disabled child items';
OBM_CHECKBOXES = 32759;
WM_CHANGEUISTATE = $0127;
WM_QUERYUISTATE = $0129;
UIS_SET = 1;
UIS_CLEAR = 2;
UIS_INITIALIZE = 3;
UISF_HIDEFOCUS = $1;
UISF_HIDEACCEL = $2;
DT_HIDEPREFIX = $00100000;
OBJID_CLIENT = $FFFFFFFC;
CHILDID_SELF = 0;
ROLE_SYSTEM_OUTLINE = $23;
ROLE_SYSTEM_STATICTEXT = $29;
ROLE_SYSTEM_CHECKBUTTON = $2c;
ROLE_SYSTEM_RADIOBUTTON = $2d;
STATE_SYSTEM_UNAVAILABLE = $1;
STATE_SYSTEM_CHECKED = $10;
STATE_SYSTEM_MIXED = $20;
EVENT_OBJECT_STATECHANGE = $800A;
IID_IUnknown: TGUID = (
D1:$00000000; D2:$0000; D3:$0000; D4:($C0,$00,$00,$00,$00,$00,$00,$46));
IID_IDispatch: TGUID = (
D1:$00020400; D2:$0000; D3:$0000; D4:($C0,$00,$00,$00,$00,$00,$00,$46));
IID_IAccessible: TGUID = (
D1:$618736e0; D2:$3c3d; D3:$11cf; D4:($81,$0c,$00,$aa,$00,$38,$9b,$71));
var
CanQueryUIState: Boolean;
type
TWinControlAccess = class (TWinControl);
{ Note: We have to use TVariantArg for Delphi 2 compat., because D2 passes
Variant parameters by reference (wrong), unlike D3+ which pass
Variant/OleVariant parameters by value }
NewOleVariant = TVariantArg;
NewWideString = Pointer;
TIUnknown = class
public
function QueryInterface(const iid: TIID; var obj): HRESULT; virtual; stdcall; abstract;
function AddRef: Longint; virtual; stdcall; abstract;
function Release: Longint; virtual; stdcall; abstract;
end;
TIDispatch = class(TIUnknown)
public
function GetTypeInfoCount(var ctinfo: Integer): HRESULT; virtual; stdcall; abstract;
function GetTypeInfo(itinfo: Integer; lcid: TLCID; var tinfo: ITypeInfo): HRESULT; virtual; stdcall; abstract;
function GetIDsOfNames(const iid: TIID; rgszNames: POleStrList;
cNames: Integer; lcid: TLCID; rgdispid: PDispIDList): HRESULT; virtual; stdcall; abstract;
function Invoke(dispIDMember: TDispID; const iid: TIID; lcid: TLCID;
flags: Word; var dispParams: TDispParams; varResult: PVariant;
excepInfo: PExcepInfo; argErr: PInteger): HRESULT; virtual; stdcall; abstract;
end;
TIAccessible = class(TIDispatch)
public
function get_accParent(var ppdispParent: IDispatch): HRESULT; virtual; stdcall; abstract;
function get_accChildCount(var pcountChildren: Integer): HRESULT; virtual; stdcall; abstract;
function get_accChild(varChild: NewOleVariant; var ppdispChild: IDispatch): HRESULT; virtual; stdcall; abstract;
function get_accName(varChild: NewOleVariant; var pszName: NewWideString): HRESULT; virtual; stdcall; abstract;
function get_accValue(varChild: NewOleVariant; var pszValue: NewWideString): HRESULT; virtual; stdcall; abstract;
function get_accDescription(varChild: NewOleVariant; var pszDescription: NewWideString): HRESULT; virtual; stdcall; abstract;
function get_accRole(varChild: NewOleVariant; var pvarRole: NewOleVariant): HRESULT; virtual; stdcall; abstract;
function get_accState(varChild: NewOleVariant; var pvarState: NewOleVariant): HRESULT; virtual; stdcall; abstract;
function get_accHelp(varChild: NewOleVariant; var pszHelp: NewWideString): HRESULT; virtual; stdcall; abstract;
function get_accHelpTopic(var pszHelpFile: NewWideString; varChild: NewOleVariant; var pidTopic: Integer): HRESULT; virtual; stdcall; abstract;
function get_accKeyboardShortcut(varChild: NewOleVariant; var pszKeyboardShortcut: NewWideString): HRESULT; virtual; stdcall; abstract;
function get_accFocus(var pvarID: NewOleVariant): HRESULT; virtual; stdcall; abstract;
function get_accSelection(var pvarChildren: NewOleVariant): HRESULT; virtual; stdcall; abstract;
function get_accDefaultAction(varChild: NewOleVariant; var pszDefaultAction: NewWideString): HRESULT; virtual; stdcall; abstract;
function accSelect(flagsSelect: Integer; varChild: NewOleVariant): HRESULT; virtual; stdcall; abstract;
function accLocation(var pxLeft: Integer; var pyTop: Integer; var pcxWidth: Integer;
var pcyHeight: Integer; varChild: NewOleVariant): HRESULT; virtual; stdcall; abstract;
function accNavigate(navDir: Integer; varStart: NewOleVariant; var pvarEnd: NewOleVariant): HRESULT; virtual; stdcall; abstract;
function accHitTest(xLeft: Integer; yTop: Integer; var pvarID: NewOleVariant): HRESULT; virtual; stdcall; abstract;
function accDoDefaultAction(varChild: NewOleVariant): HRESULT; virtual; stdcall; abstract;
function put_accName(varChild: NewOleVariant; const pszName: NewWideString): HRESULT; virtual; stdcall; abstract;
function put_accValue(varChild: NewOleVariant; const pszValue: NewWideString): HRESULT; virtual; stdcall; abstract;
end;
TAccObject = class(TIAccessible)
private
FControl: TNewCheckListBox;
FRefCount: Integer;
FStdAcc: TIAccessible;
{ TIUnknown }
function QueryInterface(const iid: TIID; var obj): HRESULT; override;
function AddRef: Longint; override;
function Release: Longint; override;
{ TIDispatch }
function GetTypeInfoCount(var ctinfo: Integer): HRESULT; override;
function GetTypeInfo(itinfo: Integer; lcid: TLCID; var tinfo: ITypeInfo): HRESULT; override;
function GetIDsOfNames(const iid: TIID; rgszNames: POleStrList;
cNames: Integer; lcid: TLCID; rgdispid: PDispIDList): HRESULT; override;
function Invoke(dispIDMember: TDispID; const iid: TIID; lcid: TLCID;
flags: Word; var dispParams: TDispParams; varResult: PVariant;
excepInfo: PExcepInfo; argErr: PInteger): HRESULT; override;
{ TIAccessible }
function get_accParent(var ppdispParent: IDispatch): HRESULT; override;
function get_accChildCount(var pcountChildren: Integer): HRESULT; override;
function get_accChild(varChild: NewOleVariant; var ppdispChild: IDispatch): HRESULT; override;
function get_accName(varChild: NewOleVariant; var pszName: NewWideString): HRESULT; override;
function get_accValue(varChild: NewOleVariant; var pszValue: NewWideString): HRESULT; override;
function get_accDescription(varChild: NewOleVariant; var pszDescription: NewWideString): HRESULT; override;
function get_accRole(varChild: NewOleVariant; var pvarRole: NewOleVariant): HRESULT; override;
function get_accState(varChild: NewOleVariant; var pvarState: NewOleVariant): HRESULT; override;
function get_accHelp(varChild: NewOleVariant; var pszHelp: NewWideString): HRESULT; override;
function get_accHelpTopic(var pszHelpFile: NewWideString; varChild: NewOleVariant; var pidTopic: Integer): HRESULT; override;
function get_accKeyboardShortcut(varChild: NewOleVariant; var pszKeyboardShortcut: NewWideString): HRESULT; override;
function get_accFocus(var pvarID: NewOleVariant): HRESULT; override;
function get_accSelection(var pvarChildren: NewOleVariant): HRESULT; override;
function get_accDefaultAction(varChild: NewOleVariant; var pszDefaultAction: NewWideString): HRESULT; override;
function accSelect(flagsSelect: Integer; varChild: NewOleVariant): HRESULT; override;
function accLocation(var pxLeft: Integer; var pyTop: Integer; var pcxWidth: Integer;
var pcyHeight: Integer; varChild: NewOleVariant): HRESULT; override;
function accNavigate(navDir: Integer; varStart: NewOleVariant; var pvarEnd: NewOleVariant): HRESULT; override;
function accHitTest(xLeft: Integer; yTop: Integer; var pvarID: NewOleVariant): HRESULT; override;
function accDoDefaultAction(varChild: NewOleVariant): HRESULT; override;
function put_accName(varChild: NewOleVariant; const pszName: NewWideString): HRESULT; override;
function put_accValue(varChild: NewOleVariant; const pszValue: NewWideString): HRESULT; override;
public
constructor Create(AControl: TNewCheckListBox);
destructor Destroy; override;
procedure ControlDestroying;
end;
function CoDisconnectObject(unk: TIUnknown; dwReserved: DWORD): HRESULT;
stdcall; external 'ole32.dll';
var
NotifyWinEventFunc: procedure(event: DWORD; hwnd: HWND; idObject: DWORD;
idChild: Longint); stdcall;
OleAccInited: BOOL;
OleAccAvailable: BOOL;
LresultFromObjectFunc: function(const riid: TGUID; wParam: WPARAM;
pUnk: TIUnknown): LRESULT; stdcall;
CreateStdAccessibleObjectFunc: function(hwnd: HWND; idObject: Longint;
const riidInterface: TGUID; var ppvObject: Pointer): HRESULT; stdcall;
function InitializeOleAcc: Boolean;
function GetSystemDir: String;
var
Buf: array[0..MAX_PATH-1] of Char;
begin
GetSystemDirectory(Buf, SizeOf(Buf) div SizeOf(Buf[0]));
Result := StrPas(Buf);
end;
var
M: HMODULE;
begin
if not OleAccInited then begin
M := LoadLibrary(PChar(AddBackslash(GetSystemDir) + 'oleacc.dll'));
if M <> 0 then begin
LresultFromObjectFunc := GetProcAddress(M, 'LresultFromObject');
CreateStdAccessibleObjectFunc := GetProcAddress(M, 'CreateStdAccessibleObject');
if Assigned(LresultFromObjectFunc) and
Assigned(CreateStdAccessibleObjectFunc) then
OleAccAvailable := True;
end;
OleAccInited := True;
end;
Result := OleAccAvailable;
end;
{ TNewCheckListBox }
constructor TNewCheckListBox.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
with TBitmap.Create do
begin
try
Handle := LoadBitmap(0, PChar(OBM_CHECKBOXES));
FCheckWidth := Width div 4;
FCheckHeight := Height div 3;
finally
Free;
end;
end;
FStateList := TList.Create;
FMinItemHeight := 16;
FOffset := 4;
FShowLines := True;
Style := lbOwnerDrawVariable;
FHotIndex := -1;
FCaptureIndex := -1;
end;
procedure TNewCheckListBox.CreateParams(var Params: TCreateParams);
begin
inherited;
FUseRightToLeft := SetBiDiStyles(Self, Params);
end;
procedure TNewCheckListBox.CreateWnd;
begin
{ TCustomListBox.CreateWnd causes a LB_RESETCONTENT message to be sent when
it's restoring FSaveItems. Increment FDisableItemStateDeletion so that
our LB_RESETCONTENT handler doesn't delete any item states. }
Inc(FDisableItemStateDeletion);
try
inherited;
finally
Dec(FDisableItemStateDeletion);
end;
end;
procedure TNewCheckListBox.UpdateThemeData(const Close, Open: Boolean);
begin
if Close then begin
if FThemeData <> 0 then begin
CloseThemeData(FThemeData);
FThemeData := 0;
end;
end;
if Open then begin
if UseThemes then
FThemeData := OpenThemeData(Handle, 'Button')
else
FThemeData := 0;
end;
end;
procedure TNewCheckListBox.CreateWindowHandle(const Params: TCreateParams);
begin
inherited CreateWindowHandle(Params);
UpdateThemeData(True, True);
end;
destructor TNewCheckListBox.Destroy;
var
I: Integer;
begin
if Assigned(FAccObjectInstance) then begin
{ Detach from FAccObjectInstance if someone still has a reference to it }
TAccObject(FAccObjectInstance).ControlDestroying;
FAccObjectInstance := nil;
end;
if Assigned(FStateList) then begin
for I := FStateList.Count-1 downto 0 do
TItemState(FStateList[I]).Free;
FStateList.Free;
end;
UpdateThemeData(True, False);
inherited Destroy;
end;
function TNewCheckListBox.AddCheckBox(const ACaption, ASubItem: string;
ALevel: Byte; AChecked, AEnabled, AHasInternalChildren,
ACheckWhenParentChecked: Boolean; AObject: TObject): Integer;
begin
if not AEnabled and CheckPotentialRadioParents(Items.Count, ALevel) then
raise Exception.Create(sRadioCantHaveDisabledChildren);
Result := AddItem2(itCheck, ACaption, ASubItem, ALevel, AChecked, AEnabled,
AHasInternalChildren, ACheckWhenParentChecked, AObject);
end;
function TNewCheckListBox.AddGroup(const ACaption, ASubItem: string;
ALevel: Byte; AObject: TObject): Integer;
begin
Result := AddItem2(itGroup, ACaption, ASubItem, ALevel, False, True, False,
True, AObject);
end;
function TNewCheckListBox.AddRadioButton(const ACaption, ASubItem: string;
ALevel: Byte; AChecked, AEnabled: Boolean; AObject: TObject): Integer;
begin
if not AEnabled then
AChecked := False;
Result := AddItem2(itRadio, ACaption, ASubItem, ALevel, AChecked, AEnabled,
False, True, AObject);
end;
function TNewCheckListBox.CanFocusItem(Item: Integer): Boolean;
begin
with ItemStates[Item] do
Result := Self.Enabled and Enabled and (ItemType <> itGroup);
end;
function TNewCheckListBox.CheckPotentialRadioParents(Index, ALevel: Integer): Boolean;
begin
Result := True;
Dec(Index);
Dec(ALevel);
while Index >= 0 do
begin
with ItemStates[Index] do
if Level = ALevel then
if ItemType = itRadio then
Exit
else
Break;
Dec(Index);
end;
if Index >= 0 then
begin
Index := GetParentOf(Index);
while Index >= 0 do
begin
if ItemStates[Index].ItemType = itRadio then
Exit;
Index := GetParentOf(Index);
end;
end;
Result := False;
end;
procedure TNewCheckListBox.CMDialogChar(var Message: TCMDialogChar);
var
I: Integer;
begin
if FWantTabs and CanFocus then
with Message do
begin
I := FindAccel(CharCode);
if I >= 0 then
begin
SetFocus;
if (FCaptureIndex <> I) or FSpaceDown then EndCapture(not FSpaceDown);
ItemIndex := I;
Toggle(I);
Result := 1
end;
end;
end;
procedure TNewCheckListBox.CMEnter(var Message: TCMEnter);
var
GoForward, Arrows: Boolean;
begin
if FWantTabs and FFormFocusChanged and (GetKeyState(VK_LBUTTON) >= 0) then
begin
if GetKeyState(VK_TAB) < 0 then begin
Arrows := False;
GoForward := (GetKeyState(VK_SHIFT) >= 0);
end
else if (GetKeyState(VK_UP) < 0) or (GetKeyState(VK_LEFT) < 0) then begin
Arrows := True;
GoForward := False;
end
else if (GetKeyState(VK_DOWN) < 0) or (GetKeyState(VK_RIGHT) < 0) then begin
Arrows := True;
GoForward := True;
end
else begin
{ Otherwise, just select the first item }
Arrows := False;
GoForward := True;
end;
if GoForward then
ItemIndex := FindNextItem(-1, True, not Arrows)
else
ItemIndex := FindNextItem(Items.Count, False, not Arrows)
end;
inherited;
end;
procedure TNewCheckListBox.CMExit(var Message: TCMExit);
begin
EndCapture(not FSpaceDown or (GetKeyState(VK_MENU) >= 0));
inherited;
end;
procedure TNewCheckListBox.CMFocusChanged(var Message: TCMFocusChanged);
begin
FFormFocusChanged := True;
inherited;
end;
procedure TNewCheckListBox.CMFontChanged(var Message: TMessage);
begin
inherited;
Canvas.Font := Font;
end;
procedure LineDDAProc(X, Y: Integer; Canvas: TCanvas); stdcall;
begin
if ((X xor Y) and 1) = 0 then
begin
Canvas.MoveTo(X, Y);
Canvas.LineTo(X + 1, Y)
end;
end;
procedure TNewCheckListBox.CMWantSpecialKey(var Message: TMessage);
begin
Message.Result := Ord(FWantTabs and (Message.WParam = VK_TAB));
end;
procedure TNewCheckListBox.CNDrawItem(var Message: TWMDrawItem);
var
L: Integer;
begin
with Message.DrawItemStruct^ do
begin
{ Note: itemID is -1 when there are no items }
if Integer(itemID) >= 0 then begin
L := ItemStates[itemID].Level;
if ItemStates[itemID].ItemType <> itGroup then Inc(L);
rcItem.Left := rcItem.Left + (FCheckWidth + 2 * FOffset) * L;
FlipRect(rcItem, ClientRect, FUseRightToLeft);
end;
{ Don't let TCustomListBox.CNDrawItem draw the focus }
if FWantTabs or (CanQueryUIState and
(SendMessage(Handle, WM_QUERYUISTATE, 0, 0) and UISF_HIDEFOCUS <> 0)) then
itemState := itemState and not ODS_FOCUS;
inherited;
end;
end;
function TNewCheckListBox.RemeasureItem(Index: Integer): Integer;
{ Recalculates an item's height. Does not repaint and does not update the
vertical scroll range (as the LB_SETITEMHEIGHT message does neither). }
begin
Result := ItemHeight;
MeasureItem(Index, Result);
SendMessage(Handle, LB_SETITEMHEIGHT, Index, Result);
end;
procedure TNewCheckListBox.UpdateScrollRange;
{ Updates the vertical scroll range, hiding/showing the scroll bar if needed.
This should be called after any RemeasureItem call. }
begin
{ Update the scroll bounds by sending a seemingly-ineffectual LB_SETTOPINDEX
message. This works on Windows 95 and 2000.
NOTE: This causes the selected item to be repainted for no apparent reason!
I wish I knew of a better way to do this... }
SendMessage(Handle, LB_SETTOPINDEX, SendMessage(Handle, LB_GETTOPINDEX, 0, 0), 0);
end;
procedure TNewCheckListBox.MeasureItem(Index: Integer; var Height: Integer);
var
DrawTextFormat: Integer;
Rect, SubItemRect: TRect;
ItemState: TItemState;
L, SubItemWidth: Integer;
S: String;
begin
with Canvas do begin
ItemState := ItemStates[Index];
Rect := Classes.Rect(0, 0, ClientWidth, 0);
L := ItemState.Level;
if ItemState.ItemType <> itGroup then
Inc(L);
Rect.Left := Rect.Left + (FCheckWidth + 2 * FOffset) * L;
Inc(Rect.Left);
if ItemState.SubItem <> '' then begin
DrawTextFormat := DT_CALCRECT or DT_NOCLIP or DT_NOPREFIX or DT_SINGLELINE;
if FUseRightToLeft then
DrawTextFormat := DrawTextFormat or (DT_RIGHT or DT_RTLREADING);
SetRectEmpty(SubItemRect);
DrawText(Canvas.Handle, PChar(ItemState.SubItem), Length(ItemState.SubItem),
SubItemRect, DrawTextFormat);
SubItemWidth := SubItemRect.Right + 2 * FOffset;
Dec(Rect.Right, SubItemWidth)
end else
Dec(Rect.Right, FOffset);
if not FWantTabs then
Inc(Rect.Left);
DrawTextFormat := DT_NOCLIP or DT_CALCRECT or DT_WORDBREAK or DT_WORD_ELLIPSIS;
if not FWantTabs or (ItemState.ItemType = itGroup) then
DrawTextFormat := DrawTextFormat or DT_NOPREFIX;
if FUseRightToLeft then
DrawTextFormat := DrawTextFormat or (DT_RIGHT or DT_RTLREADING);
S := Items[Index]; { Passing Items[Index] directly into DrawText doesn't work on Unicode build. }
ItemState.MeasuredHeight := DrawText(Canvas.Handle, PChar(S), Length(S), Rect, DrawTextFormat);
if ItemState.MeasuredHeight < FMinItemHeight then
Height := FMinItemHeight
else
Height := ItemState.MeasuredHeight + 4;
{ The height must be an even number for tree lines to be painted correctly }
if Odd(Height) then
Inc(Height);
end;
end;
procedure TNewCheckListBox.DrawItem(Index: Integer; Rect: TRect; State: TOwnerDrawState);
const
ButtonStates: array [TItemType] of Integer =
(
0,
DFCS_BUTTONCHECK,
DFCS_BUTTONRADIO
);
ButtonPartIds: array [TItemType] of Integer =
(
0,
BP_CHECKBOX,
BP_RADIOBUTTON
);
ButtonStateIds: array [TCheckBoxState, TCheckBoxState2] of Integer =
(
//Can be used for both checkboxes and radiobuttons because RBS_... constants
//equal CBS_... constants
(CBS_UNCHECKEDNORMAL, CBS_UNCHECKEDHOT, CBS_UNCHECKEDPRESSED, CBS_UNCHECKEDDISABLED),
(CBS_CHECKEDNORMAL, CBS_CHECKEDHOT, CBS_CHECKEDPRESSED, CBS_CHECKEDDISABLED),
(CBS_MIXEDNORMAL, CBS_MIXEDHOT, CBS_MIXEDPRESSED, CBS_MIXEDDISABLED)
);
var
SavedClientRect: TRect;
function FlipX(const X: Integer): Integer;
begin
if FUseRightToLeft then
Result := (SavedClientRect.Right - 1) - X
else
Result := X;
end;
procedure InternalDrawText(const S: string; var R: TRect; Format: Integer;
Embossed: Boolean);
begin
if Embossed then
begin
Canvas.Brush.Style := bsClear;
OffsetRect(R, 1, 1);
SetTextColor(Canvas.Handle, GetSysColor(COLOR_BTNHIGHLIGHT));
DrawText(Canvas.Handle, PChar(S), Length(S), R, Format);
OffsetRect(R, -1, -1);
SetTextColor(Canvas.Handle, GetSysColor(COLOR_BTNSHADOW));
DrawText(Canvas.Handle, PChar(S), Length(S), R, Format);
end
else
DrawText(Canvas.Handle, PChar(S), Length(S), R, Format);
end;
var
Disabled: Boolean;
uState, I, ThreadPosX, ThreadBottom, ThreadLevel, ItemMiddle,
DrawTextFormat: Integer;
CheckRect, SubItemRect, FocusRect: TRect;
NewTextColor: TColor;
OldColor: TColorRef;
ItemState: TItemState;
UIState: DWORD;
SubItemWidth: Integer;
PartId, StateId: Integer;
begin
if FShowLines and not FThreadsUpToDate then begin
UpdateThreads;
FThreadsUpToDate := True;
end;
SavedClientRect := ClientRect;
{ Undo flipping performed by TNewCheckListBox.CNDrawItem }
FlipRect(Rect, SavedClientRect, FUseRightToLeft);
ItemState := ItemStates[Index];
if CanQueryUIState then
UIState := SendMessage(Handle, WM_QUERYUISTATE, 0, 0)
else
UIState := 0; //no UISF_HIDEACCEL and no UISF_HIDEFOCUS
Disabled := not Enabled or not ItemState.Enabled;
with Canvas do begin
if not FWantTabs and (odSelected in State) and Focused then begin
Brush.Color := clHighlight;
NewTextColor := clHighlightText;
end
else begin
Brush.Color := Self.Color;
if Disabled then
NewTextColor := clGrayText
else
NewTextColor := Self.Font.Color;
end;
{ Draw threads }
if FShowLines then begin
Pen.Color := clGrayText;
ThreadLevel := ItemLevel[Index];
for I := 0 to ThreadLevel - 1 do
if I in ItemStates[Index].ThreadCache then begin
ThreadPosX := (FCheckWidth + 2 * FOffset) * I + FCheckWidth div 2 + FOffset;
ItemMiddle := (Rect.Bottom - Rect.Top) div 2 + Rect.Top;
ThreadBottom := Rect.Bottom;
if I = ThreadLevel - 1 then begin
if ItemStates[Index].IsLastChild then
ThreadBottom := ItemMiddle;
LineDDA(FlipX(ThreadPosX), ItemMiddle, FlipX(ThreadPosX + FCheckWidth div 2 + FOffset),
ItemMiddle, @LineDDAProc, Integer(Canvas));
end;
LineDDA(FlipX(ThreadPosX), Rect.Top, FlipX(ThreadPosX), ThreadBottom,
@LineDDAProc, Integer(Canvas));
end;
end;
{ Draw checkmark}
if ItemState.ItemType <> itGroup then begin
CheckRect := Bounds(Rect.Left - (FCheckWidth + FOffset),
Rect.Top + ((Rect.Bottom - Rect.Top - FCheckHeight) div 2),
FCheckWidth, FCheckHeight);
FlipRect(CheckRect, SavedClientRect, FUseRightToLeft);
if FThemeData = 0 then begin
case ItemState.State of
cbChecked: uState := ButtonStates[ItemState.ItemType] or DFCS_CHECKED;
cbUnchecked: uState := ButtonStates[ItemState.ItemType];
else
uState := DFCS_BUTTON3STATE or DFCS_CHECKED;
end;
if FFlat then
uState := uState or DFCS_FLAT;
if Disabled then
uState := uState or DFCS_INACTIVE;
if (FCaptureIndex = Index) and (FSpaceDown or (FLastMouseMoveIndex = Index)) then
uState := uState or DFCS_PUSHED;
DrawFrameControl(Handle, CheckRect, DFC_BUTTON, uState)
end else begin
PartId := ButtonPartIds[ItemState.ItemType];
if Disabled then
StateId := ButtonStateIds[ItemState.State][cb2Disabled]
else if Index = FCaptureIndex then
if FSpaceDown or (FLastMouseMoveIndex = Index) then
StateId := ButtonStateIds[ItemState.State][cb2Pressed]
else
StateId := ButtonStateIds[ItemState.State][cb2Hot]
else if (FCaptureIndex < 0) and (Index = FHotIndex) then
StateId := ButtonStateIds[ItemState.State][cb2Hot]
else
StateId := ButtonStateIds[ItemState.State][cb2Normal];
//if IsThemeBackgroundPartiallyTransparent(FThemeData, PartId, StateId) then
// DrawThemeParentBackground(Self.Handle, Handle, @CheckRect);
DrawThemeBackGround(FThemeData, Handle, PartId, StateId, CheckRect, @CheckRect);
end;
end;
{ Draw SubItem }
FlipRect(Rect, SavedClientRect, FUseRightToLeft);
FillRect(Rect);
FlipRect(Rect, SavedClientRect, FUseRightToLeft);
Inc(Rect.Left);
OldColor := SetTextColor(Handle, ColorToRGB(NewTextColor));
if ItemState.SubItem <> '' then
begin
DrawTextFormat := DT_NOCLIP or DT_NOPREFIX or DT_SINGLELINE or DT_VCENTER;
if FUseRightToLeft then
DrawTextFormat := DrawTextFormat or (DT_RIGHT or DT_RTLREADING);
SetRectEmpty(SubItemRect);
InternalDrawText(ItemState.SubItem, SubItemRect, DrawTextFormat or
DT_CALCRECT, False);
SubItemWidth := SubItemRect.Right + 2 * FOffset;
SubItemRect := Rect;
SubItemRect.Left := SubItemRect.Right - SubItemWidth + FOffset;
FlipRect(SubItemRect, SavedClientRect, FUseRightToLeft);
InternalDrawText(ItemState.SubItem, SubItemRect, DrawTextFormat,
FWantTabs and Disabled);
Dec(Rect.Right, SubItemWidth);
end
else
Dec(Rect.Right, FOffset);
{ Draw item text }
if not FWantTabs then
Inc(Rect.Left);
OffsetRect(Rect, 0, (Rect.Bottom - Rect.Top - ItemState.MeasuredHeight) div 2);
DrawTextFormat := DT_NOCLIP or DT_WORDBREAK or DT_WORD_ELLIPSIS;
if not FWantTabs or (ItemState.ItemType = itGroup) then
DrawTextFormat := DrawTextFormat or DT_NOPREFIX;
if (UIState and UISF_HIDEACCEL) <> 0 then
DrawTextFormat := DrawTextFormat or DT_HIDEPREFIX;
if FUseRightToLeft then
DrawTextFormat := DrawTextFormat or (DT_RIGHT or DT_RTLREADING);
{ When you call DrawText with the DT_CALCRECT flag and there's a word wider
than the rectangle width, it increases the rectangle width and wraps
at the new Right point. On the other hand, when you call DrawText
_without_ the DT_CALCRECT flag, it always wraps at the Right point you
specify -- it doesn't check for long words first.
Therefore, to ensure we wrap at the same place when drawing as when
measuring, pass our rectangle to DrawText with DT_CALCRECT first.
Wrapping at the same place is important because it can affect how many
lines are drawn -- and we mustn't draw too many. }
InternalDrawText(Items[Index], Rect, DrawTextFormat or DT_CALCRECT, False);
FlipRect(Rect, SavedClientRect, FUseRightToLeft);
InternalDrawText(Items[Index], Rect, DrawTextFormat, FWantTabs and Disabled);
{ Draw focus rectangle }
if FWantTabs and not Disabled and (odSelected in State) and Focused and
(UIState and UISF_HIDEFOCUS = 0) then
begin
FocusRect := Rect;
InflateRect(FocusRect, 1, 1);
DrawFocusRect(FocusRect);
end;
SetTextColor(Handle, OldColor);
end;
end;
procedure TNewCheckListBox.EndCapture(Cancel: Boolean);
var
InvalidateItem: Boolean;
Item: Integer;
begin
Item := FCaptureIndex;
if Item >= 0 then
begin
InvalidateItem := FSpaceDown or (FCaptureIndex = FLastMouseMoveIndex) or (FThemeData <> 0);
FSpaceDown := False;
FCaptureIndex := -1;
FLastMouseMoveIndex := -1;
if not Cancel then
Toggle(Item);
if InvalidateItem then
InvalidateCheck(Item);
end;
if MouseCapture then
MouseCapture := False;
end;
procedure TNewCheckListBox.EnumChildrenOf(Item: Integer; Proc: TEnumChildrenProc;
Ext: Longint);
var
L: Integer;
begin
if (Item < -1) or (Item >= Items.Count) then
Exit;
if Item = -1 then
begin
L := 0;
Item := 0;
end
else
begin
L := ItemLevel[Item] + 1;
Inc(Item);
end;
while (Item < Items.Count) and (ItemLevel[Item] >= L) do
begin
if ItemLevel[Item] = L then
Proc(Item, (Item < Items.Count - 1) and (ItemLevel[Item + 1] > L), Ext);
Inc(Item);
end;
end;
function TNewCheckListBox.AddItem2(AType: TItemType;
const ACaption, ASubItem: string; ALevel: Byte;
AChecked, AEnabled, AHasInternalChildren, ACheckWhenParentChecked: Boolean;
AObject: TObject): Integer;
var
ItemState: TItemState;
I: Integer;
begin
if Items.Count <> FStateList.Count then { sanity check }
raise Exception.Create('List item and state item count mismatch');
if Items.Count > 0 then
begin
if ItemLevel[Items.Count - 1] + 1 < ALevel then
ALevel := ItemLevel[Items.Count - 1] + 1;
end
else
ALevel := 0;
FThreadsUpToDate := False;
{ Use our own grow code to minimize heap fragmentation }
if FStateList.Count = FStateList.Capacity then begin
if FStateList.Capacity < 64 then
FStateList.Capacity := 64
else
FStateList.Capacity := FStateList.Capacity * 2;
end;
ItemState := TItemState.Create;
try
ItemState.ItemType := AType;
ItemState.Enabled := AEnabled;
ItemState.Obj := AObject;
ItemState.Level := ALevel;
ItemState.SubItem := ASubItem;
ItemState.HasInternalChildren := AHasInternalChildren;
ItemState.CheckWhenParentChecked := ACheckWhenParentChecked;
except
ItemState.Free;
raise;
end;
FStateList.Add(ItemState);
try
Result := Items.Add(ACaption);
except
FStateList.Delete(FStateList.Count-1);
ItemState.Free;
raise;
end;
{ If the first item in a radio group is being added, and it is top-level or
has a checked parent, force it to be checked. (We don't want to allow radio
groups with no selection.) }
if (AType = itRadio) and not AChecked and AEnabled then begin
I := GetParentOf(Result);
{ FRequireRadioSelection only affects top-level items; we never allow
child radio groups with no selection (because nobody should need that) }