lazarus

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History

martin 2c03a634c5 Merged revision(s) 64165 #7d90e95e0b, 64167-64168 #51302252eb-#51302252eb, 64195 #aa8f480e17, 64199 #473e65ba01, 64211 #1c9c36d205, 64267 #5197500844 from trunk: LCL: Propogate TAction.ImageIndex to TSpeedButton.ImageIndex. Issue #38135, patch from Anton Kavalenka. ........ LCL-GTK2: Paint a form with one color also after scrolling. Issue #16183, patch from Joeny Ang. ........ LCL/CheckGroup: Fix items and checkboxes getting out of sync upon Items.Insert. Issue #38157. ........ LCL/Grids: Fix grids truncating cell height during editing if TitleFont.Size is smaller than Font.Size. Issue #38203). ........ IDE: Prevent an infinite loop when comparing files. Issue #38185, patch from Domingo Galmés. ........ LCL/FileListbox: Update selected filename when ItemIndex is set ........ LCL: Fix selected items of TComboBoxEx and TCheckComboBox not being painted with color clHighlightText. ........ git-svn-id: branches/fixes_2_0@64612 -		2021-02-18 01:23:59 +00:00
..
README.txt
wsbuttons.pp	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wscalendar.pp	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wschecklst.pp	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wscomctrls.pp	lcl: adding sortindicator for the listview control	2020-02-24 04:12:44 +00:00
wscontrols.pp	LCL, win32: add TWSWinControlClass.GetDoubleBuffered	2018-02-16 11:15:36 +00:00
wsdesigner.pp	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wsdialogs.pp	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wsextctrls.pp	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wsextdlgs.pp	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wsfactory.pas	LCL: High-DPI ImageList: LCL runtime and win32	2018-01-10 12:46:42 +00:00
wsforms.pp	Merged revision(s) 64165 #7d90e95e0b, 64167-64168 #51302252eb-#51302252eb, 64195 #aa8f480e17, 64199 #473e65ba01, 64211 #1c9c36d205, 64267 #5197500844 from trunk:	2021-02-18 01:23:59 +00:00
wsgrids.pp	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wsimglist.pp	LCL: High-DPI ImageList: LCL runtime and win32	2018-01-10 12:46:42 +00:00
wslazdeviceapis.pas	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wslclclasses.pp	Merged revision 60964 #3ddc6c5a7b from trunk	2019-07-29 12:40:38 +00:00
wsmenus.pp	Move debug- & other non-GUI stuff from LCLProc to LazUtilities and LazLogger in package LazUtils.	2018-06-13 13:59:07 +00:00
wspairsplitter.pp	Merged revision(s) 61909 #028edb1573 from trunk:	2019-09-26 17:25:46 +00:00
wsproc.pp	LCL: Implement TCustomMemo.ScrollBy. Refactor widgetset ScrollBy from ScrollingWinControl to WinControl. Solves issue #29067 .	2015-11-29 18:45:53 +00:00
wsreferences.pp	Improve license headers in sources, part 1. Refer to details about license, not copyright. Remove jargon about lack of warranty, it is covered in license already.	2013-05-24 18:30:06 +00:00
wsspin.pp	Reverts changes to the handling of vclass due to issues in gtk2	2017-06-01 19:36:16 +00:00
wsstdctrls.pp	LCL: publish DoubleBuffered & ParentDoubleBuffered	2018-06-03 20:36:08 +00:00
wstoolwin.pp	Improve license headers in sources, part 1. Refer to details about license, not copyright. Remove jargon about lack of warranty, it is covered in license already.	2013-05-24 18:30:06 +00:00

README.txt

This directory contains all skeleton widget set component 
classes. These classes will never get instantiated and may 
only contain class functions.
  
=========  
IMPORTANT
=========  

Derivation and inheritance of classes is different then one
might be used to. It will be explained by the following 
examples.

Suppose the following LCL class hierarchy:

 TLCLComponent
     |
  TControl
     |
 TWinControl
 
the corresponding WS skeleton would be

 TWSLCLComponent
      |
  TWSControl
      |
 TWSWinControl


When method X of TWSControl gets implemented by 
widgetset Q the hierarchy looks like

 TWSLCLComponent
      |
  TWSControl.X --> TQWSControl.X
      |
 TWSWinControl


Calling TWSWinControl.X doesn't call TQWSControl.X since
it's parent is TWSControl. This problem is solved by 
modifying the class hierarchy at runtime.
When a component class is registered by RegisterWSComponent,
the class is copied and the vmt entries are adjusted so 
that the hierarchy looks like:


 TWSLCLComponent
      |
  TWSControl.X --> TQWSControl.X
                        |
                   TWSWinControl

In this case, calling TWSWinControl.X will call the overridden 
TQWSControl.X. The only thing which doesn't get handled is the 
inherited statement. Suppose there is also a TQWSWinControl.X 
which implements a few extra steps. In a normal situation one 
would have called "inherited". The call to inherited is
resolved at compile time and would in this example to a call to
TWSControl.X. That is not what we want.
To get around this, call the parent yourself:
  TWSWinControlClass(ClassParent).X