Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
On Thu, 8 Jan 2026 11:51:15 +0100, Mattias Gaertner via fpc-pascal wrote: > > >On 1/8/26 11:42, Bo Berglund via fpc-pascal wrote: >>[...] >> When I say autosize does not work I mean that the size changes but it does >> not >> include the value part, which is what extends the text size... > >Have you checked the checkbox' Constraints? > >Or maybe there is another control overlapping? > >Mattias I have never looked at the property "Constraints" before, but when I check (in the Lazarus IDE) I see these: Maxheight 0 MaxWidth0 MinHeight 0 MinWith 0 I assume that with these set to zero the entire group of properties is disabled? Anyway, these are the defaults from when I added the component on the form. And there is nothing close to the checkbox either. Other properties of the checkbox: Align = alNone Alignment = taRightJustify Anchors = [akTop, akLeft] AutoSize = true Parent_xxx are all True And as I said it works as expected on Windows, fails on Linux (Ubuntu 24.04 With MINT desktop) Question: Is there some "refresh" method available for the checkbox, which will re-draw it on screen? -- Bo Berglund Developer in Sweden ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
On 1/8/26 11:42, Bo Berglund via fpc-pascal wrote: [...] When I say autosize does not work I mean that the size changes but it does not include the value part, which is what extends the text size... Have you checked the checkbox' Constraints? Or maybe there is another control overlapping? Mattias ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
On Wed, 7 Jan 2026 13:59:13 +0100, Mattias Gaertner via fpc-pascal wrote: > > >On 1/6/26 21:52, Bo Berglund via fpc-pascal wrote: >>[...] >> On Windows the control expands in size to show the paramater added after the >> function text (which is always shown). >> But on Linux it does not expand enough to show the complete text, only the >> first >> digit of the number is visible. >> So it does try but fails to get it right (too small)... > >TCheckBox is used all over the the IDE and autosize works on all platforms. >Do you have an example? > >Mattias This is the actual event handler that activates the value and shows it on screen: procedure TfrmMain.ckbShiftAudioChange(Sender: TObject); var bShowLipsync: boolean; begin //Alternate function for audio delay handling with indication //of actual state on the control caption itself AudioShiftVal := 0; //Default value in global variable bShowLipsync := ckbShiftAudio.Checked; if bShowLipsync then AudioShiftVal := speAudio.Value; //Alternate placement of value in separate TStaticText container: //stxShiftAudio.Caption := IntToStr(AudioShiftVal); TCheckBox(Sender).Caption := 'Shift Audio: ' + IntToStr(AudioShiftVal); vlcPlayer.SetAudioDelay(AudioShiftVal *1000); end; The ckbShiftAudio checkbox is set to Autosize and it works fine on Windows but not on Linux... The altaernate way where the checkbox properties are not touched in this OnChange event is to add a TStaticText item to the right of the checkbox and write the value into that, but that has other problems: - Where to place it so it sits adjacent to the checkbox in both environments - How to get the same font size on the controls When I have adjusted this on Windows it works fine too, but again fails on Linux in a different way sice there are then control overlaps and also font size differences As you can see the actual working function is just to read another control having the value to use and set the system up to use it. This works on both Windows and Linux functionally. But the display to the user is different on the platforms and essentially unusable on Linux. This is so strange, I have made several applications which use the same code via SVN on both platforms and "just works" in both places. But not so for this seemingly simple task... Note: When I say autosize does not work I mean that the size changes but it does not include the value part, which is what extends the text size... So typically I can see the first char of the value (often the sign) but then the checkbox caption ends and no more is visible. -- Bo Berglund Developer in Sweden ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
On 1/6/26 21:52, Bo Berglund via fpc-pascal wrote: [...] On Windows the control expands in size to show the paramater added after the function text (which is always shown). But on Linux it does not expand enough to show the complete text, only the first digit of the number is visible. So it does try but fails to get it right (too small)... TCheckBox is used all over the the IDE and autosize works on all platforms. Do you have an example? Mattias ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
On 07/01/2026 09:39, Bo Berglund via fpc-pascal wrote: Still not working: Error: Identifier not found: GetTextSize Hi, It relates to the widget set and destination platform. Try this instead: with checkbox do begin AutoSize:=False; Caption:='new text'; Width:=Canvas.TextWidth(Caption)+30; end; Which is working fine here. cheers, Martin. ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
On Tue, 6 Jan 2026 23:50:43 +, Martin Wynne via fpc-pascal wrote: >On 06/01/2026 23:15, Bo Berglund via fpc-pascal wrote: >> Did not work: >> >> Error: Identifier not found "ControlCanvas" >> >> Where is this item declared? > >Sorry, that was Delphi code for Windows. In Lazarus for cross-platform >do this: > >uses > LCLIntf; > >var > w,h:integer; > >begin > with checkbox do begin >AutoSize:=False; >Caption:='new text'; >GetTextSize(Font,Caption,w,h); >Width:=w+30; > end; > > Tested but: Still not working: Error: Identifier not found: GetTextSize Does this depend on something outside of Lazarus? -- Bo Berglund Developer in Sweden ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
This is better: with checkbox do begin AutoSize:=False; Caption:='new text'; Width:=Canvas.TextWidth(Caption)+30; end; ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
On 06/01/2026 23:15, Bo Berglund via fpc-pascal wrote: Did not work: Error: Identifier not found "ControlCanvas" Where is this item declared? Sorry, that was Delphi code for Windows. In Lazarus for cross-platform do this: uses LCLIntf; var w,h:integer; begin with checkbox do begin AutoSize:=False; Caption:='new text'; GetTextSize(Font,Caption,w,h); Width:=w+30; end; Martin. ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
On Tue, 6 Jan 2026 21:33:27 +, Martin Wynne via fpc-pascal wrote: >Hi, > >Suggest: > >with checkbox do begin > >Autosize:=False; >Caption:='new text'; >Width:=ControlCanvas.TextWidth(Caption); > >end; > >Martin. Did not work: Error: Identifier not found "ControlCanvas" Where is this item declared? -- Bo Berglund Developer in Sweden ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
Hi, Suggest: with checkbox do begin Autosize:=False; Caption:='new text'; Width:=ControlCanvas.TextWidth(Caption); end; Martin. ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
[fpc-pascal] How to make TCheckBox autosize work correctly on Linux?
I have an application for video editing/viewing which I started back around 2019. I use it daily and have improved it over time to streamline its use. Now I have run into a problem concerning the display of TCheckbox objects: I have used regular buttons in the past for two parameter setting/activation functions but changed to use TCheckBox because then I can then show the state of the parameter (active/inactive) as well as its value. So when I click the checkbox active there is a checkmark shown so I see its active state. When activating the parameter I write the new value (integer) to the end of the caption so the value is shown. I have set the Autosize property to True so the control resizes to fit the new longer text. This works fine on Windows but when I build the project on Linux (Ubuntu Server 24.04 with the MATE desktop added) it worked fine before I did the switch to use TCheckBox rather than TButton controls. On Windows the control expands in size to show the paramater added after the function text (which is always shown). But on Linux it does not expand enough to show the complete text, only the first digit of the number is visible. So it does try but fails to get it right (too small)... It seems like Lazarus/FPC is unable to figure out the correct size to use for the control in the Autosize operation How can I correct this such that it expands fully to show the added text like it does on Windows? Is there a command I can use at the end of the code that runs when the checkbox is clicked and the caption is modified to force it to show the full text? My devtool versions are : FPC: 3.2.2 Lazarus: 4.2 OS: Windows 11 / Ubuntu 24.04 Server + MATE desktop The project is the same on both Linux and Windows, I use Subversion to keep the versions on both platforms the same. I have a function that runs on startup if on UNIX (ifdef-ed) which modifies some parameters which differ between the operating systems. I could add something there if needed but I don't know what to use in order to make these controls behave. TIA -- Bo Berglund Developer in Sweden ___ fpc-pascal maillist - [email protected] https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
