1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
{
fpGUI - Free Pascal GUI Toolkit
Copyright (C) 2006 - 2011 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Description:
A component that can set all components on a form and embedded
containers as read-only or not. There are various events that
fire during the process, to allow for maximum flexibility.
}
unit fpg_readonly;
{$mode objfpc}{$H+}
interface
uses
Classes
;
type
TfpgOnChangeReadOnlyEvent = procedure(pSender: TObject; pReadOnly: boolean) of object;
TfpgOnProcessEvent = procedure(pSender: TObject; var pReadOnly, pProcess: boolean) of object;
TfpgOnProcessFrmEvent = procedure(pFrame: TComponent; var pProcessDetails: boolean) of object;
TfpgOnGetParentEvent = procedure(var pParent: TComponent) of object;
TfpgReadOnly = class(TComponent)
private
FReadOnly: boolean;
FOnChange: TfpgOnChangeReadOnlyEvent;
FOnProcess: TfpgOnProcessEvent;
FEnabled: boolean;
FOnProcessFrm: TfpgOnProcessFrmEvent;
FProcessContainer: boolean;
FOnGetParent: TfpgOnGetParentEvent;
procedure SetEnabled(const AValue: boolean);
protected
function GetReadOnly: boolean; virtual;
procedure SetReadOnly(const AValue: boolean); virtual;
procedure SetComponentsReadOnly(pReadOnly: boolean); virtual;
function GetParentForm: TComponent;
public
constructor Create(AOwner: TComponent); override;
published
property ReadOnly: boolean read GetReadOnly write SetReadOnly default false;
property Enabled: boolean read FEnabled write SetEnabled default false;
property ProcessContainer: boolean read FProcessContainer write FProcessContainer default false;
property OnChange: TfpgOnChangeReadOnlyEvent read FOnChange write FOnChange;
property OnProcess: TfpgOnProcessEvent read FOnProcess write FOnProcess;
property OnProcessFrm: TfpgOnProcessFrmEvent read FOnProcessFrm write FOnProcessFrm;
property OnGetParent: TfpgOnGetParentEvent read FOnGetParent write FOnGetParent;
end;
implementation
uses
fpg_main
,fpg_form
,fpg_widget
,TypInfo
;
{ TfpgReadOnly }
constructor TfpgReadOnly.Create(AOwner: TComponent);
begin
inherited;
FReadOnly := false;
FEnabled := false;
FProcessContainer := false;
end;
function TfpgReadOnly.GetParentForm: TComponent;
begin
result := self;
while true do
begin
if (result is TfpgForm) and
((result.Owner is TfpgApplication) or
(result.Owner = nil)) then
Break; //==>
result := result.Owner;
end;
if Assigned(FOnGetParent) then
FOnGetParent(result);
end;
function TfpgReadOnly.GetReadOnly: boolean;
begin
Result := FReadOnly;
end;
procedure TfpgReadOnly.SetComponentsReadOnly(pReadOnly: boolean);
procedure _SetComponentsReadOnly(pParent: TComponent);
var
i: integer;
lComponent: TComponent;
lReadOnly, lProcess: boolean;
begin
if pParent=nil then
Exit; //==>
for i := 0 to pParent.ComponentCount - 1 do
begin
lComponent := pParent.Components[i];
if lComponent = self then
Continue; //==>
if IsPublishedProp(lComponent, 'ReadOnly') then
begin
lReadOnly := pReadOnly;
lProcess := True;
if Assigned(FOnProcess) then
FOnProcess(lComponent, lReadOnly, lProcess);
if lProcess then
SetOrdProp(lComponent, 'ReadOnly', Ord(lReadOnly));
end;
if (lComponent is TfpgWidget) and TfpgWidget(lComponent).IsContainer then
begin
lProcess := FProcessContainer; // Now lProcess is: can I go Deep?
if Assigned(FOnProcessFrm) then
FOnProcessFrm(lComponent, lProcess);
if lProcess then
_SetComponentsReadOnly(lComponent);
end;
end;
end;
begin
_SetComponentsReadOnly(GetParentForm);
end;
procedure TfpgReadOnly.SetEnabled(const AValue: boolean);
begin
FEnabled := AValue;
end;
procedure TfpgReadOnly.SetReadOnly(const AValue: boolean);
begin
if not FEnabled then
Exit; //==>
if FReadOnly = AValue then
Exit; //==>
FReadOnly := AValue;
SetComponentsReadOnly(FReadOnly);
if Assigned(FOnChange) then
FOnChange(Self, FReadOnly);
end;
end.
|
