| 1 | Unit CustomCheckListBox;
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| 2 |
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| 3 | Interface
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| 4 |
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| 5 | {$ifdef win32}
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| 6 | Uses
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| 7 | StdCtrls, ExtCtrls;
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| 8 |
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| 9 | Type
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| 10 | TCheckListBoxType = TCheckListBox;
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| 11 |
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| 12 | {$else}
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| 13 | Uses
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| 14 | Classes,Forms,Graphics,StdCtrls, SysUtils;
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| 15 |
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| 16 | Type
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| 17 | ECheckListException = class( Exception );
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| 18 |
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| 19 | TCheckListBoxData = class
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| 20 | Data: TObject;
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| 21 | Checked: boolean;
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| 22 | end;
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| 23 |
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| 24 | TCustomCheckListBox=Class(TListBox)
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| 25 | Protected
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| 26 | FBitmapList: TBitmapList;
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| 27 | FOnCheckboxChanged: TNotifyEvent;
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| 28 | Protected
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| 29 | Function GetChecked( Index: LongInt ): boolean;
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| 30 | Procedure SetChecked( Index: LongInt; Value:boolean );
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| 31 |
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| 32 | Function GetString( Index: LongInt ): string;
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| 33 | Procedure SetString( Index: LongInt; Value: string );
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| 34 | Function GetObject( Index: LongInt ): TObject;
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| 35 | Procedure SetObject( Index: LongInt; Value: TObject );
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| 36 |
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| 37 | Function GetItemCount: longint;
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| 38 |
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| 39 | Function GetSelectedObject: TObject;
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| 40 | Procedure SetSelectedObject( Value: TObject );
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| 41 | Function GetSelectedString: string;
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| 42 | Function GetCheckedCount: longint;
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| 43 | Protected
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| 44 | Procedure SetupComponent; Override;
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| 45 | Destructor Destroy; Override;
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| 46 | Procedure MouseClick( Button: TMouseButton;
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| 47 | ShiftState: TShiftState;
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| 48 | X, Y: longint ); override;
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| 49 | Procedure MouseDblClick( Button: TMouseButton;
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| 50 | ShiftState: TShiftState;
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| 51 | X, Y: longint ); override;
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| 52 | Procedure DrawItem( Index: LongInt;
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| 53 | rec: TRect;
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| 54 | State: TOwnerDrawState ); Override;
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| 55 | Procedure CharEvent( Var key: Char;
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| 56 | RepeatCount: Byte ); Override;
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| 57 |
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| 58 | Procedure CheckCheckboxHit( X, Y: longint );
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| 59 | Property Style;
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| 60 | Public
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| 61 | property ItemCount: longint read GetItemCount;
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| 62 | Property Checked[ Index: LongInt ]: boolean Read GetChecked Write SetChecked;
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| 63 | Property Objects[ Index: longint ]: TObject read GetObject Write SetObject;
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| 64 |
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| 65 | Function AddItemObject( TheString: string;
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| 66 | TheObject: TObject;
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| 67 | Checked: boolean ): longint;
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| 68 | Procedure Clear; override;
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| 69 | Property CheckedCount: longint read GetCheckedCount;
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| 70 |
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| 71 | // get the checked items (and objects) to dest
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| 72 | Procedure GetCheckedItems( Dest: TStrings );
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| 73 | // same as above, but don't clear dest beforehand
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| 74 | Procedure AddCheckedItems( Dest: TStrings );
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| 75 | Property SelectedObject: TObject read GetSelectedObject write SetSelectedObject;
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| 76 | Property SelectedString: string read GetSelectedString;
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| 77 |
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| 78 | Published
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| 79 | Property OnCheckBoxChanged:TNotifyEvent Read FOnCheckboxChanged Write FOnCheckboxChanged;
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| 80 | End;
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| 81 |
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| 82 | TCheckListBoxType = TCustomCheckListBox;
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| 83 |
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| 84 | Exports
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| 85 | TCustomCheckListBox, 'User', 'CustomCheckListBox.bmp';
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| 86 | {$endif}
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| 87 |
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| 88 | Procedure GetCheckedItems( CheckListBox: TCheckListBoxType;
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| 89 | Items: TStrings );
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| 90 | Procedure GetCheckedObjects( CheckListBox: TCheckListBoxType;
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| 91 | Objects: TList );
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| 92 | Procedure AddCheckedItems( CheckListBox: TCheckListBoxType;
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| 93 | Items: TStrings );
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| 94 | Procedure AddCheckedObjects( CheckListBox: TCheckListBoxType;
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| 95 | Objects: TList );
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| 96 | Procedure AddCheckListItemObject( CheckListBox: TCheckListBoxType;
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| 97 | Text: String;
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| 98 | TheObject: TObject;
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| 99 | Checked: boolean );
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| 100 | Procedure SetAllCheckListItems( CheckListBox: TCheckListBoxType;
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| 101 | Value: boolean );
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| 102 | Function CheckListItemCount( CheckListBox: TCheckListBoxType ): integer;
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| 103 | Function CheckListObject( CheckListBox: TCheckListBoxType;
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| 104 | Index: integer ): TObject;
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| 105 | Function SelectedCheckListObject( CheckListBox: TCheckListBoxType ): TObject;
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| 106 | Function SelectedCheckListItem( CheckListBox: TCheckListBoxType ): string;
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| 107 | Function CheckedCount( CheckListBox: TCheckListBoxType ): integer;
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| 108 |
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| 109 | Implementation
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| 110 |
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| 111 | {$ifdef os232}
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| 112 | Uses
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| 113 | PMWin, OS2Def;
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| 114 | {$R CustomCheckListBox}
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| 115 | {$endif}
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| 116 |
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| 117 | {$ifdef win32}
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| 118 | Procedure AddCheckedItems( CheckListBox: TCheckListBoxType;
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| 119 | Items: TStrings );
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| 120 | var
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| 121 | i: integer;
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| 122 | begin
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| 123 | for i:= 0 to CheckListBox.Items.Count - 1 do
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| 124 | if CheckListBox.Checked[ i ] then
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| 125 | Items.AddObject( CheckListBox.Items[ i ],
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| 126 | CheckListBox.Items.Objects[ i ] );
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| 127 | end;
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| 128 |
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| 129 | Procedure AddCheckedObjects( CheckListBox: TCheckListBoxType;
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| 130 | Objects: TList );
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| 131 | var
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| 132 | i: integer;
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| 133 | begin
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| 134 | for i:= 0 to CheckListBox.Items.Count - 1 do
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| 135 | if CheckListBox.Checked[ i ] then
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| 136 | Objects.Add( CheckListBox.Items.Objects[ i ] );
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| 137 | end;
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| 138 |
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| 139 | Procedure GetCheckedItems( CheckListBox: TCheckListBoxType;
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| 140 | Items: TStrings );
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| 141 | begin
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| 142 | Items.Clear;
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| 143 | AddCheckedItems( CheckListBox, Items );
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| 144 | end;
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| 145 |
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| 146 | Procedure GetCheckedObjects( CheckListBox: TCheckListBoxType;
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| 147 | Objects: TList );
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| 148 | begin
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| 149 | Objects.Clear;
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| 150 | AddCheckedObjects( CheckListBox, Objects );
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| 151 | end;
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| 152 |
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| 153 | Procedure AddCheckListItemObject( CheckListBox: TCheckListBoxType;
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| 154 | Text: String;
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| 155 | TheObject: TObject;
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| 156 | Checked: boolean );
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| 157 | var
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| 158 | AddPosition: integer;
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| 159 | begin
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| 160 | AddPosition:= CheckListBox.Items.AddObject( Text, TheObject );
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| 161 | CheckListBox.Checked[ AddPosition ]:= Checked;
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| 162 | end;
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| 163 |
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| 164 | Procedure SetAllCheckListItems( CheckListBox: TCheckListBoxType;
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| 165 | Value: boolean );
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| 166 | var
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| 167 | i: integer;
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| 168 | begin
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| 169 | for i:= 0 to CheckListBox.Items.Count - 1 do
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| 170 | CheckListBox.Checked[ i ] := Value;
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| 171 | end;
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| 172 |
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| 173 | Function CheckListItemCount( CheckListBox: TCheckListBoxType ): integer;
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| 174 | begin
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| 175 | Result:= CheckListBox.Items.Count;
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| 176 | end;
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| 177 |
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| 178 | Function CheckListObject( CheckListBox: TCheckListBoxType;
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| 179 | Index: integer ): TObject;
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| 180 | begin
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| 181 | Result:= CheckListBox.Items.Objects[ Index ];
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| 182 | end;
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| 183 |
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| 184 | Function SelectedCheckListObject( CheckListBox: TCheckListBoxType ): TObject;
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| 185 | begin
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| 186 | if CheckListBox.ItemIndex <> -1 then
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| 187 | Result:= CheckListBox.Items.Objects[ CheckListBox.ItemIndex ]
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| 188 | else
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| 189 | Result:= nil;
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| 190 | end;
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| 191 |
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| 192 | Function SelectedCheckListItem( CheckListBox: TCheckListBoxType ): string;
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| 193 | begin
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| 194 | if CheckListBox.ItemIndex <> -1 then
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| 195 | Result:= CheckListBox.Items[ CheckListBox.ItemIndex ]
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| 196 | else
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| 197 | Result:= '';
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| 198 | end;
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| 199 |
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| 200 | Function CheckedCount( CheckListBox: TCheckListBoxType ): integer;
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| 201 | var
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| 202 | i: integer;
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| 203 | begin
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| 204 | Result:= 0;
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| 205 | for i:= 0 to CheckListBox.Items.Count - 1 do
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| 206 | if CheckListBox.Checked[ i ] then
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| 207 | inc( Result );
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| 208 | end;
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| 209 |
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| 210 | {$else}
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| 211 | Procedure AddCheckedItems( CheckListBox: TCustomCheckListBox;
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| 212 | Items: TStrings );
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| 213 | begin
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| 214 | CheckListBox.AddCheckedItems( Items );
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| 215 | end;
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| 216 |
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| 217 | Procedure GetCheckedObjects( CheckListBox: TCheckListBoxType;
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| 218 | Objects: TList );
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| 219 | var
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| 220 | i: integer;
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| 221 | begin
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| 222 | for i:= 0 to CheckListBox.Items.Count - 1 do
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| 223 | if CheckListBox.Checked[ i ] then
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| 224 | Objects.Add( CheckListBox.Objects[ i ] );
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| 225 | end;
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| 226 |
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| 227 | Procedure GetCheckedItems( CheckListBox: TCustomCheckListBox;
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| 228 | Items: TStrings );
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| 229 | begin
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| 230 | Items.Clear;
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| 231 | AddCheckedItems( CheckListBox, Items );
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| 232 | end;
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| 233 |
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| 234 | Procedure AddCheckedObjects( CheckListBox: TCheckListBoxType;
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| 235 | Objects: TList );
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| 236 | begin
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| 237 | Objects.Clear;
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| 238 | AddCheckedObjects( CheckListBox, Objects );
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| 239 | end;
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| 240 |
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| 241 | Procedure AddCheckListItemObject( CheckListBox: TCustomCheckListBox;
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| 242 | Text: String;
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| 243 | TheObject: TObject;
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| 244 | Checked: boolean );
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| 245 | begin
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| 246 | CheckListBox.AddItemObject( Text, TheObject, Checked );
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| 247 | end;
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| 248 |
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| 249 | Procedure SetAllCheckListItems( CheckListBox: TCustomCheckListBox;
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| 250 | Value: boolean );
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| 251 | var
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| 252 | i: integer;
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| 253 | begin
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| 254 | CheckListBox.BeginUpdate;
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| 255 | for i:= 0 to CheckListBox.Items.Count - 1 do
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| 256 | CheckListBox.Checked[ i ] := Value;
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| 257 | CheckListBox.EndUpdate;
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| 258 | end;
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| 259 |
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| 260 | Function CheckListItemCount( CheckListBox: TCustomCheckListBox ): integer;
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| 261 | begin
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| 262 | Result:= CheckListBox.ItemCount;
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| 263 | end;
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| 264 |
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| 265 | Function CheckListObject( CheckListBox: TCustomCheckListBox;
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| 266 | Index: integer ): TObject;
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| 267 | begin
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| 268 | Result:= CheckListBox.Objects[ Index ];
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| 269 | end;
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| 270 |
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| 271 | Function SelectedCheckListObject( CheckListBox: TCustomCheckListBox ): TObject;
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| 272 | begin
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| 273 | Result:= CheckListBox.SelectedObject;
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| 274 | end;
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| 275 |
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| 276 | Function SelectedCheckListItem( CheckListBox: TCustomCheckListBox ): string;
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| 277 | begin
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| 278 | Result:= CheckListBox.SelectedString;
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| 279 | end;
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| 280 |
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| 281 | Function CheckedCount( CheckListBox: TCustomCheckListBox ): integer;
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| 282 | begin
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| 283 | Result:= CheckListBox.CheckedCount;
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| 284 | end;
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| 285 |
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| 286 | {$endif}
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| 287 |
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| 288 | {$ifdef os2}
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| 289 |
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| 290 | Procedure TCustomCheckListBox.SetupComponent;
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| 291 | Begin
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| 292 | Inherited SetupComponent;
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| 293 |
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| 294 | Name := 'CustomCheckListBox';
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| 295 | Style := lbOwnerdrawFixed;
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| 296 | ItemHeight := 20;
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| 297 | FBitmapList:= TBitmapList.Create;
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| 298 | FBitmapList.AddResourceName('BmpLBUnChecked');
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| 299 | FBitmapList.AddResourceName('BmpLBChecked');
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| 300 | End;
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| 301 |
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| 302 |
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| 303 | Destructor TCustomCheckListBox.Destroy;
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| 304 | Begin
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| 305 | Inherited Destroy;
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| 306 | FBitmapList.Destroy;
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| 307 | End;
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| 308 |
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| 309 | Procedure TCustomCheckListBox.DrawItem( Index: LongInt;
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| 310 | rec: TRect;
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| 311 | State: TOwnerDrawState );
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| 312 | var
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| 313 | textWidth, textHeight: longint;
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| 314 | destWidth, destHeight: longint;
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| 315 | textY: Longint;
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| 316 | s: string;
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| 317 | Dest: Trect;
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| 318 | X: longint;
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| 319 | Bitmap: TBitmap;
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| 320 | idx: longint;
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| 321 | Item: TCheckListBoxData;
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| 322 | Begin
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| 323 |
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| 324 | Dest:= rec;
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| 325 | dec( Dest.top ); // minor adjustments since we seem to get a slightly
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| 326 | inc( Dest.left ); // incorrect area to draw on...
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| 327 | destWidth:= Dest.Right - Dest.left;
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| 328 | destHeight:= Dest.Top - Dest.Bottom;
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| 329 |
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| 330 | // First draw the item background, in highlight colour if needed
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| 331 | IF State * [odSelected] <> [] THEN
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| 332 | Canvas.Brush.Color := clHighLight
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| 333 | ELSE
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| 334 | Canvas.Brush.Color := Color;
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| 335 | Canvas.FillRect( Dest, Canvas.Brush.Color );
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| 336 |
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| 337 | X:= Dest.left;
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| 338 |
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| 339 | // I don't know why but the bitmap colour is affected by the pen colour ?!
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| 340 | Canvas.Pen.Color := clBlack;
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| 341 |
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| 342 | Item:= Items.Objects[ Index ] as TCheckListBoxData;
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| 343 |
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| 344 | idx:= longint( Item.Checked );
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| 345 | Bitmap:= FBitmapList.Bitmaps[ idx ];
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| 346 | Canvas.Draw( X + 2,
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| 347 | Dest.bottom + ( ItemHeight - Bitmap.Height ) div 2,
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| 348 | Bitmap );
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| 349 |
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| 350 | inc( X, 20 );
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| 351 | // Draw string
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| 352 | s := Items[Index];
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| 353 |
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| 354 | Canvas.GetTextExtent( s, textWidth, textHeight);
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| 355 |
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| 356 | // Centre the text vertically in the available space
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| 357 | textY:= Dest.Bottom + ((destHeight - textHeight) DIV 2);
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| 358 | IF textY < Dest.Bottom THEN
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| 359 | textY:= Dest.Bottom;
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| 360 |
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| 361 | Canvas.Pen.Color := PenColor;
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| 362 | Canvas.TextOut( X, TextY, s);
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| 363 |
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| 364 | End;
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| 365 |
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| 366 | Procedure TCustomCheckListBox.CharEvent( Var key:Char;
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| 367 | RepeatCount:Byte);
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| 368 | Begin
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| 369 | If key= ' ' Then
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| 370 | Checked[ ItemIndex ]:= not Checked[ ItemIndex ];
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| 371 | Inherited CharEvent( key, RepeatCount );
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| 372 | End;
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| 373 |
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| 374 | Function TCustomCheckListBox.GetChecked(Index:LongInt):boolean;
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| 375 | var
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| 376 | Item: TCheckListBoxData;
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| 377 | Begin
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| 378 | Item:= Items.Objects[ Index ] as TCheckListBoxData;
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| 379 | Result:= Item.Checked;
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| 380 | End;
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| 381 |
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| 382 | Procedure TCustomCheckListBox.SetChecked(Index:LongInt;Value:boolean);
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| 383 | var
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| 384 | Item: TCheckListBoxData;
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| 385 | Begin
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| 386 | Item:= Items.Objects[ Index ] as TCheckListBoxData;
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| 387 | Item.Checked:= Value;
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| 388 | Invalidate;
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| 389 | End;
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| 390 |
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| 391 | Procedure TCustomCheckListBox.CheckCheckboxHit( X, Y: longint );
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| 392 | Var
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| 393 | index: longint;
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| 394 | p: TPoint;
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| 395 | Begin
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| 396 | if X < 20 then
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| 397 | begin
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| 398 | p.X:= X;
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| 399 | p.Y:= Y;
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| 400 | index:= ItemAtPos( p, true );
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| 401 | if index<>-1 then
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| 402 | Checked[ index ]:= not Checked[ index ];
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| 403 | end;
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| 404 | end;
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| 405 |
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| 406 | Procedure TCustomCheckListBox.MouseClick( Button: TMouseButton;
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| 407 | ShiftState: TShiftState;
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| 408 | X, Y: longint );
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| 409 | Begin
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| 410 | CheckCheckboxHit( X, Y );
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| 411 | Inherited MouseClick( Button, ShiftState, X, Y );
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| 412 | End;
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| 413 |
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| 414 | Procedure TCustomCheckListBox.MouseDblClick( Button: TMouseButton;
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| 415 | ShiftState: TShiftState;
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| 416 | X, Y: longint );
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| 417 | Begin
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| 418 | CheckCheckboxHit( X, Y );
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| 419 | Inherited MouseDblClick( Button, ShiftState, X, Y );
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| 420 | End;
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| 421 |
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| 422 | Function TCustomCheckListBox.GetString( index: longint ): string;
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| 423 | Begin
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| 424 | Result:= Items[ index ];
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| 425 | End;
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| 426 |
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| 427 | Procedure TCustomCheckListBox.SetString( Index: LongInt; Value: string );
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| 428 | Begin
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| 429 | Items[ index ]:= Value;
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| 430 | End;
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| 431 |
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| 432 | Function TCustomCheckListBox.GetObject( Index: LongInt ): TObject;
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| 433 | var
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| 434 | Item: TCheckListBoxData;
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| 435 | Begin
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| 436 | Item:= Items.Objects[ Index ] as TCheckListBoxData;
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| 437 | Result:= Item.Data;
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| 438 | End;
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| 439 |
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| 440 | Procedure TCustomCheckListBox.SetObject( Index: LongInt; Value: TObject );
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| 441 | var
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| 442 | Item: TCheckListBoxData;
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| 443 | Begin
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| 444 | Item:= Items.Objects[ Index ] as TCheckListBoxData;
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| 445 | Item.Data:= Value;
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| 446 | End;
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| 447 |
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| 448 | Function TCustomCheckListBox.AddItemObject( TheString: string;
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| 449 | TheObject: TObject;
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| 450 | Checked: boolean ): longint;
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| 451 | var
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| 452 | Item: TCheckListBoxData;
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| 453 | Begin
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| 454 | Item:= TCheckListBoxData.Create;
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| 455 | Item.Data:= TheObject;
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| 456 | Item.Checked:= Checked;
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| 457 | Result:= Items.AddObject( TheString, Item );
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| 458 | End;
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| 459 |
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| 460 | Procedure TCustomCheckListBox.Clear;
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| 461 | var
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| 462 | i: longint;
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| 463 | Item: TCheckListBoxData;
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| 464 | Begin
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| 465 | for i:= 0 to Items.Count - 1 do
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| 466 | begin
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| 467 | Item:= Items.Objects[ i ] as TCheckListBoxData;
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| 468 | Item.Destroy;
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| 469 | end;
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| 470 | Inherited Clear;
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| 471 | End;
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| 472 |
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| 473 | Function TCustomCheckListBox.GetItemCount: longint;
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| 474 | Begin
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| 475 | Result:= Items.Count;
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| 476 | End;
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| 477 |
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| 478 | Function TCustomCheckListBox.GetSelectedObject: TObject;
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| 479 | Begin
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| 480 | if ItemIndex<>-1 then
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| 481 | Result:= Objects[ ItemIndex ]
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| 482 | else
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| 483 | Result:= nil;
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| 484 | End;
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| 485 |
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| 486 | Procedure TCustomCheckListBox.SetSelectedObject( Value: TObject );
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| 487 | Var
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| 488 | Index: longint;
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| 489 | Begin
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| 490 | Index:= Items.IndexOfObject( Value );
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| 491 | if Index <> -1 then
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| 492 | ItemIndex:= Index;
|
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| 493 | End;
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| 494 |
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| 495 | Function TCustomCheckListBox.GetSelectedString: string;
|
|---|
| 496 | Begin
|
|---|
| 497 | if ItemIndex<>-1 then
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| 498 | Result:= Items[ ItemIndex ]
|
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| 499 | else
|
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| 500 | Result:= '';
|
|---|
| 501 | End;
|
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| 502 |
|
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| 503 | Function TCustomCheckListBox.GetCheckedCount: longint;
|
|---|
| 504 | var
|
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| 505 | i: longint;
|
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| 506 | Item: TCheckListBoxData;
|
|---|
| 507 | Begin
|
|---|
| 508 | Result:= 0;
|
|---|
| 509 | for i:= 0 to Items.Count - 1 do
|
|---|
| 510 | begin
|
|---|
| 511 | Item:= Items.Objects[ i ] as TCheckListBoxData;
|
|---|
| 512 | if Item.Checked then
|
|---|
| 513 | inc( Result );
|
|---|
| 514 | end;
|
|---|
| 515 | end;
|
|---|
| 516 |
|
|---|
| 517 | Procedure TCustomCheckListBox.AddCheckedItems( Dest: TStrings );
|
|---|
| 518 | var
|
|---|
| 519 | i: longint;
|
|---|
| 520 | Item: TCheckListBoxData;
|
|---|
| 521 | Begin
|
|---|
| 522 | for i:= 0 to Items.Count - 1 do
|
|---|
| 523 | begin
|
|---|
| 524 | Item:= Items.Objects[ i ] as TCheckListBoxData;
|
|---|
| 525 | if Item.Checked then
|
|---|
| 526 | Dest.AddObject( Items[ i ],
|
|---|
| 527 | Item.Data );
|
|---|
| 528 | end;
|
|---|
| 529 | end;
|
|---|
| 530 |
|
|---|
| 531 | Procedure TCustomCheckListBox.GetCheckedItems( Dest: TStrings );
|
|---|
| 532 | begin
|
|---|
| 533 | Dest.Clear;
|
|---|
| 534 | AddCheckedItems( Dest );
|
|---|
| 535 | end;
|
|---|
| 536 |
|
|---|
| 537 | Initialization
|
|---|
| 538 | {Register classes}
|
|---|
| 539 | RegisterClasses([TCustomCheckListBox]);
|
|---|
| 540 | {$endif}
|
|---|
| 541 |
|
|---|
| 542 | End.
|
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