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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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234 lines
7.4 KiB
PHP
234 lines
7.4 KiB
PHP
// included by stdctrls.pp
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{******************************************************************************
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TRadioButton
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******************************************************************************
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*****************************************************************************
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* *
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* This file is part of the Lazarus Component Library (LCL) *
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* *
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* See the file COPYING.LCL, included in this distribution, *
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* for details about the copyright. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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* *
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*****************************************************************************
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current design flaws:
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- derived from TCustomCheckBox instead of TButtonControl
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Delphi compatibility:
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- derived from TCustomCheckBox instead of TButtonControl
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- alignment property is missing
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- lots of unknown issues
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TODO:
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- check for Delphi compatibility
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* Who's responsible for the fGroup - pointer and who'll free the
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memory allocated for it??????
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* make serious tests
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Bugs:
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- s.a. TCustomCheckbox
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}
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{------------------------------------------------------------------------------
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Method: TRadioButton.Create
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Params: aOwner : owner of this object
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Returns: Nothing
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Create a new TradioButton
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------------------------------------------------------------------------------}
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constructor TRadioButton.Create(AOwner : TComponent);
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begin
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inherited Create(AOwner);
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fCompStyle := csRadioButton;
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Visible := False;
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Hint := 'Radiobutton';
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ShowHint := True;
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fGroup := 0;
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AutoSize := True;
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end;
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{------------------------------------------------------------------------------
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Method: TRadioButton.CreateWnd
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Params: none
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Returns: Nothing
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Create the visual component of a TradioButton.
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HINT: Since every Radiobutton has to belong to a group, we'll search
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our owners componentlist for other radiobuttons. If one is found
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with it's group property assigned, this instance will get the
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handle of that one as it's fGroup property, otherwise the group
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property will be 0.
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In the interface we can then use the group property to decide if
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a new group has to be created or which radiobutton is the
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predecessor. The first radiobutton, which handle is created, will get as Group
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the group handle.
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This behaviour is especially neccessary for the GTK bindings.
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------------------------------------------------------------------------------}
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procedure TRadioButton.CreateWnd;
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var
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i : integer;
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temp : TComponent;
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begin
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fGroup:=0;
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i := Owner.ComponentCount-1;
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while (i >= 0) and (fGroup = 0) do
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begin // search for radiobutton which is predecessor
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Temp := Owner.Components [i];
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if (Temp is TRadioButton) and (TRadioButton (temp).fGroup <> 0) then
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fGroup := THandle (TRadioButton(Temp).Handle); // set group to our predecessor
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dec (i);
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end;
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inherited CreateWnd;
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end;
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{------------------------------------------------------------------------------
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Method: TRadioButton.DestroyWnd
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Params: none
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Returns: Nothing
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The handle is destroyed, and therefore the radiobutton does not belong any
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longer to a group. The Group property is the handle of the predecessor
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TRadioButton.
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-> Bind the successor TRadioButton to our predecessor
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------------------------------------------------------------------------------}
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procedure TRadioButton.DestroyWnd;
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var
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i: integer;
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ARadioButton: TRadioButton;
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begin
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if fGroup<>0 then begin
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if HandleAllocated then begin
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for i:=0 to Owner.ComponentCount-1 do
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if (Owner.Components[i] is TRadioButton) then begin
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ARadioButton:=TRadioButton(Owner.Components[i]);
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if ARadioButton.fGroup=Handle then
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ARadioButton.fGroup:=fGroup;
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end;
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end;
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fGroup:=0;
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end;
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inherited DestroyWnd;
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end;
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{------------------------------------------------------------------------------
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Method: TRadioButton.SetGroup
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Params: value : group this radiobutton belongs to
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Returns: Nothing
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Assign this radiobutton to a group of radiobuttons.
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------------------------------------------------------------------------------}
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procedure TRadioButton.SetGroup(Value : THandle);
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begin
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Assert(False, 'Trace:IN SETGROUP. Caption = '+ Self.Caption);
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FGroup := Value;
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RecreateWnd;
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end;
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{------------------------------------------------------------------------------
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Method: TRadioButton.GetGroup
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Params: none
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Returns: Handle of the group this button belongs to
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Return handle to the group the radiobutton belongs to.
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------------------------------------------------------------------------------}
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function TRadioButton.GetGroup : THandle;
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begin
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GetGroup := FGroup;
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end;
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{------------------------------------------------------------------------------
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Method: TRadioButton.SetText
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Params: Value: TCaption
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Returns: nothing
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Change the caption, and then recreate to update, then call to AutoSize
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------------------------------------------------------------------------------}
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procedure TRadioButton.SetText(const Value: TCaption);
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begin
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Inherited SetText(Value);
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RecreateWnd;
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AutoSize := FAutoSize;
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end;
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{------------------------------------------------------------------------------
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Method: TCheckbox.SetAutoSize
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Params: Value : Boolean
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Returns: nothing
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Sets AutoSize Flag, and if True, attempts to Size to fit Caption
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------------------------------------------------------------------------------}
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procedure TRadioButton.SetAutoSize(Value : Boolean);
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var
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R : TRect;
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DC : hDC;
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begin
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FAutoSize := Value;
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If not AutoSize then
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Exit;
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if not HandleAllocated then exit;
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DC := GetDC(Handle);
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Try
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R := Rect(0,0, Width, Height);
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DrawText(DC, PChar(Caption), Length(Caption), R,
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DT_CalcRect or DT_NOPrefix);
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If R.Right > 25 then
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Width := R.Right + 25;
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If R.Bottom > 25 then
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Height := R.Bottom + 2;
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Finally
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ReleaseDC(Handle, DC);
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end;
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end;
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// included by stdctrls.pp
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{
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$Log$
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Revision 1.6 2002/08/24 06:51:22 lazarus
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MG: from Andrew: style list fixes, autosize for radio/checkbtns
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Revision 1.5 2002/05/13 14:47:00 lazarus
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MG: fixed client rectangles, TRadioGroup, RecreateWnd
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Revision 1.4 2002/05/13 06:12:57 lazarus
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MG: fixed saving unitlinks after changing fpc soure path
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Revision 1.3 2002/05/10 06:05:55 lazarus
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MG: changed license to LGPL
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Revision 1.2 2002/04/18 08:09:03 lazarus
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MG: added include comments
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Revision 1.1 2000/07/13 10:28:27 michael
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+ Initial import
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Revision 1.2 2000/05/09 02:07:40 lazarus
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Replaced writelns with Asserts. CAW
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Revision 1.1 2000/04/02 20:49:56 lazarus
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MWE:
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Moved lazarus/lcl/*.inc files to lazarus/lcl/include
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Revision 1.5 2000/01/02 00:25:12 lazarus
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Stoppok:
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- enhanced TCustomradiogroup & TCustomgroupbox
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Revision 1.4 1999/12/30 19:04:13 lazarus
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- Made TRadiobutton work again
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- Some more cleanups to checkbox code
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stoppok
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}
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