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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
{
fpGUI - Free Pascal GUI Library
Copyright (C) 2006 - 2008 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:
Defines a basic Label control. Also known as a Caption component.
}
unit gui_label;
{$mode objfpc}{$H+}
interface
uses
Classes,
SysUtils,
gfxbase,
fpgfx,
gfx_UTF8utils,
gfx_widget;
type
TfpgCustomLabel = class(TfpgWidget)
private
FAutoSize: boolean;
FAlignment: TAlignment;
FWrapText: boolean;
FWrappedText: TStringList;
procedure Wrap(MaxLength: integer; AText: string);
procedure SetWrapText(const AValue: boolean);
procedure SetAlignment(const AValue: TAlignment);
function GetFontDesc: string;
procedure SetAutoSize(const AValue: boolean);
procedure SetFontDesc(const AValue: string);
procedure SetText(const AValue: string);
procedure ResizeLabel;
protected
FText: string;
FFont: TfpgFont;
procedure HandlePaint; override;
property WrapText: boolean read FWrapText write SetWrapText default False;
property Alignment: TAlignment read FAlignment write SetAlignment default taLeftJustify;
property Length: integer read FWidth write SetWidth;
property AutoSize: boolean read FAutoSize write SetAutoSize default False;
property FontDesc: string read GetFontDesc write SetFontDesc;
property Text: string read FText write SetText;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
property Font: TfpgFont read FFont;
end;
TfpgLabel = class(TfpgCustomLabel)
published
property Alignment;
property AutoSize;
property BackgroundColor;
property FontDesc;
property Length;
property Text;
property TextColor;
property WrapText;
property OnClick;
property OnDoubleClick;
property OnMouseDown;
property OnMouseEnter;
property OnMouseExit;
property OnMouseMove;
property OnMouseUp;
end;
// A convenience function to create a TfpgLabel instance
function CreateLabel(AOwner: TComponent; x, y: TfpgCoord; AText: string): TfpgLabel; overload;
function CreateLabel(AOwner: TComponent; x, y, w: TfpgCoord; AText: string): TfpgLabel; overload;
implementation
function CreateLabel(AOwner: TComponent; x, y: TfpgCoord; AText: string): TfpgLabel;
begin
Result := TfpgLabel.Create(AOwner);
Result.Left := x;
Result.Top := y;
Result.Text := AText;
Result.Width := Result.Font.TextWidth(Result.Text) + 5; // 5 is some extra spacing
end;
function CreateLabel(AOwner: TComponent; x, y, w: TfpgCoord; AText: string): TfpgLabel;
begin
Result := TfpgLabel.Create(AOwner);
Result.Left := x;
Result.Top := y;
Result.Text := AText;
if w = 0 then
begin
Result.Width := Result.Font.TextWidth(Result.Text) + 5; // 5 is some extra spacing
Result.FAutoSize := True;
end
else
begin
Result.Width := w;
Result.WrapText := True;
end;
end;
{ TfpgCustomLabel }
procedure TfpgCustomLabel.Wrap(MaxLength: integer; AText: string);
begin
FWrappedText.Clear;
repeat
if UTF8Pos(' ', AText) > 0 then
if Font.TextWidth(UTF8Copy(AText, 1, UTF8Pos(' ', AText))) < MaxLength then
begin
if FWrappedText.Count > 0 then
if (Font.TextWidth(FWrappedText[Pred(FWrappedText.Count)] + ' ' +
UTF8Copy(AText, 1, UTF8Pos(' ', AText)))) < MaxLength then
FWrappedText[Pred(FWrappedText.Count)] := FWrappedText[Pred(FWrappedText.Count)] + ' '
+ UTF8Copy(AText, 1, Pred(UTF8Pos(' ', AText)))
else
FWrappedText.Add(UTF8Copy(AText, 1, Pred(UTF8Pos(' ', AText))))
else
FWrappedText.Add(UTF8Copy(AText, 1, Pred(UTF8Pos(' ', AText))));
AText := UTF8Copy(AText, Succ(UTF8Pos(' ', AText)), UTF8Length(AText) - Pred(UTF8Pos(' ', AText)));
end;
until UTF8Pos(' ', AText) = 0;
if (Font.TextWidth(FWrappedText[Pred(FWrappedText.Count)] + ' ' + AText)) < MaxLength then
FWrappedText[Pred(FWrappedText.Count)] := FWrappedText[Pred(FWrappedText.Count)] + ' ' + AText
else
FWrappedText.Add(AText);
Height := FWrappedText.Count * (Font.Height + 2);
end;
procedure TfpgCustomLabel.SetWrapText(const AValue: boolean);
begin
FWrapText := AValue;
if FWrapText then
Wrap(Width, FText)
else
Height := FFont.Height;
end;
procedure TfpgCustomLabel.SetAlignment(const AValue: TAlignment);
begin
if FAlignment = AValue then
Exit;
FAlignment := AValue;
if FAlignment <> taLeftJustify then
FAutoSize := False;
end;
function TfpgCustomLabel.GetFontDesc: string;
begin
Result := FFont.FontDesc;
end;
procedure TfpgCustomLabel.SetAutoSize(const AValue: boolean);
begin
if FAutoSize = AValue then
Exit; //==>
FAutoSize := AValue;
if FAutoSize then
FAlignment := taLeftJustify;
ResizeLabel;
end;
procedure TfpgCustomLabel.SetFontDesc(const AValue: string);
begin
FFont.Free;
FFont := fpgGetFont(AValue);
ResizeLabel;
end;
procedure TfpgCustomLabel.SetText(const AValue: string);
begin
if FText = AValue then
Exit; //==>
FText := AValue;
ResizeLabel;
end;
procedure TfpgCustomLabel.ResizeLabel;
begin
if FAutoSize then
begin
Width := FFont.TextWidth(FText);
Height := FFont.Height;
SetPosition(Left, Top, Width, Height);
end
else
if FWrapText then
Wrap(Width, FText)
else
Height := FFont.Height;
RePaint;
end;
constructor TfpgCustomLabel.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FText := 'Label';
FFont := fpgGetFont('#Label1');
FHeight := FFont.Height;
FWidth := 80;
FTextColor := Parent.TextColor;
FBackgroundColor := Parent.BackgroundColor;
FAutoSize := False;
FAlignment := taLeftJustify;
FWrapText := False;
FWrappedText := TStringList.Create;
end;
destructor TfpgCustomLabel.Destroy;
begin
FText := '';
FFont.Free;
FWrappedText.Free;
inherited Destroy;
end;
procedure TfpgCustomLabel.HandlePaint;
var
i: integer;
r: TfpgRect;
begin
Canvas.BeginDraw;
inherited;
Canvas.ClearClipRect;
r.SetRect(0, 0, Width, Height);
Canvas.Clear(FBackgroundColor);
Canvas.SetFont(Font);
Canvas.SetTextColor(FTextColor);
if WrapText then
begin
if FWrappedText.Count> 0 then
for i:= 0 to Pred(FWrappedText.Count) do
case FAlignment of
taLeftJustify:
fpgStyle.DrawString(Canvas, 0, (Font.Height + 2) * i, FWrappedText[i], Enabled);
taRightJustify:
fpgStyle.DrawString(Canvas, Width - Font.TextWidth(FWrappedText[i]), (Font.Height + 2) * i,
FWrappedText[i], Enabled);
taCenter:
fpgStyle.DrawString(Canvas, (Width - Font.TextWidth(FWrappedText[i])) div 2, (Font.Height + 2) * i,
FWrappedText[i], Enabled);
end;
end
else
case FAlignment of
taLeftJustify:
fpgStyle.DrawString(Canvas, 0, 0, FText, Enabled);
taRightJustify:
fpgStyle.DrawString(Canvas, Width - Font.TextWidth(FText), 0, FText, Enabled);
taCenter:
fpgStyle.DrawString(Canvas, (Width - Font.TextWidth(FText)) div 2, 0, FText, Enabled);
end;
Canvas.EndDraw;
end;
end.
|
