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[SOLVED] VST DefaultNodeHeight
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Topic: [SOLVED] VST DefaultNodeHeight (Read 1073 times)
Pe3s
Hero Member
Posts: 533
[SOLVED] VST DefaultNodeHeight
«
on:
August 03, 2022, 08:04:55 pm »
Hello, I have a question, what could be the reason for DefaultNodeHeight not working?
«
Last Edit: August 04, 2022, 09:07:09 am by Pe3s
»
Logged
balazsszekely
Guest
Re: VST DefaultNodeHeight
«
Reply #1 on:
August 03, 2022, 08:23:57 pm »
Please always attach a demo application, otherwise it's really hard to guess. Most likely cause: you changed VST->TreeOptions->MiscOptions->toVariableNodeHeight to True, and did not assign anything to OnMesureItem event.
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Pe3s
Hero Member
Posts: 533
Re: VST DefaultNodeHeight
«
Reply #2 on:
August 03, 2022, 09:03:40 pm »
VST-> TreeOptions-> MiscOptions-> toVariableNodeHeight to True. OnMeasureItem is empty. VST v5
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jamie
Hero Member
Posts: 6091
Re: VST DefaultNodeHeight
«
Reply #3 on:
August 03, 2022, 11:41:14 pm »
So you think because you enabled variable height but didn't supply a OnMessure Event it should take the DefaultHeight?
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The only true wisdom is knowing you know nothing
Pe3s
Hero Member
Posts: 533
Re: VST DefaultNodeHeight
«
Reply #4 on:
August 04, 2022, 07:05:04 am »
What steps do I need to follow to increase the height of the rows in the VirtualStringTree component, entering values in the
DefaultNodeHeight does not give anything ????
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El Salvador
Full Member
Posts: 134
Re: VST DefaultNodeHeight
«
Reply #5 on:
August 04, 2022, 07:56:14 am »
In event vst's OnMeasureItem you must change var NodeHeight:
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
DoMeasureItem
(
Sender
:
TBaseVirtualTree
;
TargetCanvas
:
TCanvas
;
Node
:
PVirtualNode
;
var
NodeHeight
:
Integer
)
;
begin
//Node height based of DPI
NodeHeight
:
=
Round
(
(
Screen
.
PixelsPerInch
/
96.0
)
*
36
)
;
end
;
Logged
Pe3s
Hero Member
Posts: 533
Re: VST DefaultNodeHeight
«
Reply #6 on:
August 04, 2022, 09:06:39 am »
Thank you
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wp
Hero Member
Posts: 11858
Re: [SOLVED] VST DefaultNodeHeight
«
Reply #7 on:
August 04, 2022, 12:54:21 pm »
In the attachment there is a demo in which a handler for the OnMeasureItem event is not needed. Just set the value of DefaultNodeHeight in the Object Inspector or at runtime before the nodes are initialized (populated) because they get the NodeHeight and TotalNodeHeight stored in the TVirtualNode record here from DefaultNodeHeight (TBaseVirtualTree.MakeNewNode).
Note that the attached demo is written with the VTV version which comes with Lazarus. If the demo does not compile because you use the OPM or some other version remove the laz.virtualtreeview_package from the project depencies and add virtualtreeview_package instead. And in unit1's uses clause replace "Laz.VirtualTrees" by "VirtualTrees".
«
Last Edit: August 04, 2022, 01:47:54 pm by wp
»
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Pe3s
Hero Member
Posts: 533
Re: [SOLVED] VST DefaultNodeHeight
«
Reply #8 on:
August 04, 2022, 04:28:21 pm »
A big thank you to everyone
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[SOLVED] VST DefaultNodeHeight
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