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uurllabel.pas
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uurllabel.pas
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unit uUrlLabel;
{ A simple TLabel which opens it's Caption in systems default browser on click
Copyright (C) 2018 Mohammadreza Bahrami m.audio91@gmail.com
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.
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. See the GNU Library General Public License
for more details.
You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA.
}
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Controls, StdCtrls, Graphics, LclIntf;
type
{ TCustomUrlLabel }
TCustomUrlLabel = class(TLabel)
private
FLastColor: TColor;
FHighlightColor: TColor;
FUseHighlightColor: Boolean;
procedure SetHighlightColor(AValue: TColor);
public
property HighlightColor: TColor read FHighlightColor write SetHighlightColor;
procedure MouseEnter; override;
procedure MouseLeave; override;
constructor Create(TheOwner: TComponent); override;
end;
{ TUrlLabel }
TUrlLabel = class(TCustomUrlLabel)
public
procedure Click; override;
end;
{ TUrlLabelEx }
TUrlLabelEx = class(TCustomUrlLabel)
private
FUrl: String;
public
property URL: String read FUrl write FUrl;
procedure Click; override;
constructor Create(TheOwner: TComponent); override;
end;
implementation
{ TCustomUrlLabel }
procedure TCustomUrlLabel.SetHighlightColor(AValue: TColor);
begin
FUseHighlightColor := False;
if AValue = Font.Color then Exit;
FHighlightColor := AValue;
FUseHighlightColor := True;
end;
procedure TCustomUrlLabel.MouseEnter;
begin
Inherited MouseEnter;
if FUseHighlightColor then
begin
FLastColor := Font.Color;
Font.Color := FHighlightColor;
end
else
Font.Style := Font.Style+[fsUnderline];
Cursor := crHandPoint;
end;
procedure TCustomUrlLabel.MouseLeave;
begin
inherited MouseLeave;
if FUseHighlightColor then
Font.Color := FLastColor
else
Font.Style := Font.Style-[fsUnderline];
Cursor := crDefault;
end;
constructor TCustomUrlLabel.Create(TheOwner: TComponent);
begin
inherited Create(TheOwner);
ParentBidiMode := False;
BiDiMode := bdLeftToRight;
FUseHighlightColor := False;
end;
{ TUrlLabel }
procedure TUrlLabel.Click;
begin
inherited Click;
if Caption <> EmptyStr then
OpenURL(Caption);
end;
{ TUrlLabelEx }
procedure TUrlLabelEx.Click;
begin
inherited Click;
if FUrl <> EmptyStr then
OpenURL(FUrl);
end;
constructor TUrlLabelEx.Create(TheOwner: TComponent);
begin
inherited Create(TheOwner);
FUrl := EmptyStr;
end;
end.