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IDProjectCategoryView StatusDate SubmittedLast Update
0031618LazarusWidgetsetpublic2017-03-31 16:492018-09-13 21:32
ReporterVojtech Cihak Assigned ToJuha Manninen  
PrioritynormalSeverityminorReproducibilityalways
Status closedResolutionfixed 
Platformamd64OSLinux 
Product Version1.7 (SVN) 
Summary0031618: TSpinEdit.OnChange events in GTk2
DescriptionIssues of TSpinEdit.OnChange and TFloatSpinEdit.OnChange events in GTk2:

1) Events are triggered on program startup. It does not happen in LCL-Qt nor in Delphi 7.

2) TFloatSpinEdit .OnChange is triggered twice (change by key, mouse or code). It does not happen in LCL-Qt nor in Delphi 7.
Steps To ReproduceRun demo. You will see:
SpinEdit1OnChange
FloatSpinEdit2OnChange
SpinEdit2OnChange
FloatSpinEdit1OnChange
FloatSpinEdit2OnChange

Try change value of any FloatSpinEdit by key or mouse. OnChange is triggered twice.

Push button [ +1 ]. It increments 1 to all spinedits. You will see:
FloatSpinEdit1OnChange
FloatSpinEdit2OnChange
SpinEdit1OnChange
SpinEdit2OnChange
FloatSpinEdit1OnChange
FloatSpinEdit2OnChange
Additional InformationLazarus 1.7 r51977:54499M FPC 3.0.2 x86_64-linux-qt
TagsNo tags attached.
Fixed in Revision
LazTarget-
WidgetsetGTK 2
Attached Files

Relationships

related to 0018679 closedZeljan Rikalo Lazarus wrong behaviour of TFloatSpinEdit at Keyboard input 
related to 0032196 closedJuha Manninen Lazarus BorderSpacing changes byt itself when multi-selecting components 
related to 0032975 resolvedJuha Manninen Lazarus A patch for fixing OnChange of TFloatSpinEdit and TSpinEdit is triggered but nothing changed when TForm.Show with gtk2 
related to 0032669 new Packages OnChange event couldn‘t be triggered correctly when using Memo1.ClearSelection 
related to 0032602 confirmed Lazarus TEdit.OnChange event handler is calling twice for same text 
related to 0032368 new Lazarus TFloatSpinEdit emits dealyed secondary OnChange on Value change when DecimalPlaces=0 

Activities

Vojtech Cihak

2017-03-31 16:49

reporter  

SpinEditGTk.zip (2,344 bytes)

Bart Broersma

2017-04-08 14:41

developer   ~0099502

> r51977:54499M
You have local modifications, does this also happen if you revert these?

Vojtech Cihak

2017-04-10 20:05

reporter   ~0099547

Yes, I just updated and reverted changes and it still happens.

Lazarus 1.9.0 r54600M FPC 3.0.2 x86_64-linux-qt

Bart Broersma

2017-04-10 21:58

developer   ~0099549

> Lazarus 1.9.0 r54600M FPC 3.0.2 x86_64-linux-qt
The M means you stil have modifications.
And you confuse me, because you stated that this is a GTK2 issue?

Vojtech Cihak

2017-04-11 16:30

reporter   ~0099561

I reverted local changes more precisely. Now: Lazarus 1.9.0 r54603 FPC 3.0.2 x86_64-linux-gtk2

Lazarus itself is Qt app. Demo compiled as a GTk2 app makes issue. Demo as a Qt app works fine.

Bart Broersma

2017-07-31 12:07

developer   ~0102006

Last edited: 2017-07-31 12:07

View 2 revisions

 Here's what happens when I click the up-arrow (FSE is a TFloatSpinEdit):

gtkchanged_spinbox
gtkchanged_spinbox
FSE.OnChange: Value = 0.0, Text = 0.00 //this is the old value
FSE.OnChange: Value = 0.0, Text = 0.00
gtkchanged_spinbox
gtkchanged_spinbox
FSE.OnChange: Value = 1.0, Text = 1.00
FSE.OnChange: Value = 1.0, Text = 1.00
gtkchanged_editbox
gtkchanged_editbox
FSE.OnChange: Value = 1.0, Text = 1.00

Then when I leave the control:

gtkchanged_spinbox
gtkchanged_spinbox
FSE.OnChange: Value = 1.0, Text = 1.00
FSE.OnChange: Value = 1.0, Text = 1.00

So, there are 2 signals that cause an OnChange: the change in Text and the change in Value.

For a TSpinEdit it is
gtkchanged_spinbox
gtkchanged_editbox
gtkchanged_editbox
SE.OnChange: Value = 2.0, Text = 2

No additional change signals when I leave the control.

Bart Broersma

2017-07-31 13:12

developer   ~0102007

The fix for 0018679 (r36095) introduces this behaviour.

When my TFloatSpinEdit (2 digits) has value 99.00 (Text 99,00) and I press the up arrow this is what happens:

In gtkchanged_spinbox;
..
      //SValue = '99.00' ADecimalSeparator = '.'
      if (Pos(ADecimalSeparator, SValue) > 0) and (length(SValue) > 1) then
      begin
        SNewValue := Copy(SValue,Pos(ADecimalSeparator, SValue) + 1, length(SValue));
        while length(SNewValue) > NumDigits do
        begin
          Delete(SValue, length(SValue), 1);
          inc(NumDigits);
        end;
      end;

After that SNewValue will be '00'
and then

      if SNewValue <> SValue then
        gtk_entry_set_text(PGtkEntry(Widget), PChar(SValue));

And this will trigger further 'value-changed' triggers that will ultimately cause OnChange events to happen.

This part of the code is only executed if DecimalPlaces > 0, so the TSpinEdit will not sufer from this bug.

Bart Broersma

2017-07-31 14:14

developer   ~0102008

Last edited: 2017-08-01 00:15

View 4 revisions

 Some of the superfluous OnChanges can be fixed by changing the logic to

        TextDigits := Length(Copy(SValue,Pos(ADecimalSeparator, SValue) + 1, length(SValue)));
        if (TextDigits > NumDigits) then
        begin
          Delete(SValue, length(SValue) - (TextDigits-NumDigits-1), (TextDigits-NumDigits));
        end;

As far as I understand this code, it is used to eliminate extra digits the user types in the control.

E.g. Text is 12.34, DecimalPlaces = 2, and user types a digit (e.g. 5) with cursor at end of the text
In this scenario SValue (text retrieved from the control) will be 12.345, and the code will trim that down to 12.34 again.

At least with this fix typing in the control reduces the number of OnChanges to 1 per typed character.
Incrementing the value (cicking the up-arrow) will however first send a gtkchanged_spinbox and later a gtkchanged_spinbox, and I still get 2 OnChanges.

Bart Broersma

2017-08-01 01:20

developer   ~0102022

Last edited: 2017-08-01 01:20

View 2 revisions

 This is getting silly:

I increment my TFloatSpinEdit (use up-arrow of the keyboard) from 99.00 to 100.00

gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "99.00" <> SNewValue: "00" call: gtk_entry_set_text
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "99.00" <> SNewValue: "00" call: gtk_entry_set_text
*** FSE.OnChange: Value = 99.0000, Text = 99.00
*** FSE.OnChange: Value = 99.0000, Text = 99.00
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text
*** FSE.OnChange: Value = 100.0000, Text = 100.00
*** FSE.OnChange: Value = 100.0000, Text = 100.00
gtkchanged_editbox
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text
*** FSE.OnChange: Value = 100.0000, Text = 100.00
*** FSE.OnChange: Value = 100.0000, Text = 100.00
gtkchanged_editbox
*** FSE.OnChange: Value = 100.0000, Text = 100.00
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text

7 OnChanges.

Doing the same with the mouse (clicking the up-arrow of the control) gives:

gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "99.00" <> SNewValue: "00" call: gtk_entry_set_text
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "99.00" <> SNewValue: "00" call: gtk_entry_set_text
*** FSE.OnChange: Value = 99.0000, Text = 99.00
*** FSE.OnChange: Value = 99.0000, Text = 99.00
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text
*** FSE.OnChange: Value = 100.0000, Text = 100.00
*** FSE.OnChange: Value = 100.0000, Text = 100.00
gtkchanged_editbox
gtkchanged_editbox
*** FSE.OnChange: Value = 100.0000, Text = 100.00
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text
gtkchanged_spinbox A
gtkchanged_spinbox F
  SValue: "100.00" <> SNewValue: "00" call: gtk_entry_set_text

5 OnChanges

Bart Broersma

2017-08-01 23:13

developer   ~0102026

What a mess.
With my patch:
- increment (use up-key or up-arrow): 2 OnChanges
- delete one character: 1 OnChange
- increment after you deleted one character: 3 OnChanges

At least exiting the control does not fire an OnChange anymore.

B.t.w. I would have expected that deleting a character would fire a gtkchanged_editbox, but it only fires gtkchanged_spinbox.

Bart Broersma

2017-08-02 18:14

developer   ~0102040

Last edited: 2017-08-02 18:18

View 3 revisions

 Can you please try with r55630.
On my system it reduces the amount of OnChanges to 1 per change, wether you edit, or increment/decrement.

The OnChange at program start still remains however.
Also the following sequnce will produce 3 onChanges, where 2 are expected:
Delete one character in the control (1 OnChange), then increment or decrement (2 OnChanges).

PS I'm on Linux Mint 18.0-64-bit. GTK 2.24.30

I uloaded a simple test program (spin.zip) that counts the OnChanges of the TFloatSpinEdit.
You can reset the counter to zero by pressing Ctrl+D (this will also write some empty lines to the console).

Bart Broersma

2017-08-02 18:16

developer  

spin.zip (65,379 bytes)

Vojtech Cihak

2017-08-25 03:27

reporter   ~0102357

My test with Lazarus 1.9.0 r55743 FPC 3.0.2 x86_64-linux-qt:

Demo in GTk2:
1) OnChange at program start remains (no OnChange in Qt)
2a) Deleting character (0.50 -> 0.5) triggers OnChange (it is in Qt too)
2b) Then increment or decrement triggers two OnChanges (only one in Qt)
3) Pushing button [+1] triggers only one OnChange for each SpinEdit, but out of order:

GTk2:
FloatSpinEdit1OnChange
FloatSpinEdit2OnChange
SpinEdit1OnChange
SpinEdit2OnChange

Expected order (as it is in Qt):
SpinEdit1OnChange
SpinEdit2OnChange
FloatSpinEdit1OnChange
FloatSpinEdit2OnChange

Bart Broersma

2017-08-25 22:13

developer   ~0102382

Last edited: 2017-08-25 22:14

View 2 revisions

 Well, I did not touch QT, only GTK2.
Is GTK2 now better, worse or unchanged for you.
For me it is better, but definitvely not fixed.

If it is better for you on GTK2 as well, we'll merge it into 1.8 release.

SpinEdit on GTK2 is a nasty control (at least the way it is implemented now) IMO.

Alternatively you can use T(Float)SpinEditEx (unit LazControls).
It should have less issues.

Vojtech Cihak

2017-08-26 01:41

reporter   ~0102384

I wouldn't merge anything now.

But both SpiEdits on GTk2 didn't behave this way in past. There has to be revision that broked it (I don't believe it was r.360xx, it had to be later).

Vojtech Cihak

2017-08-26 14:14

reporter   ~0102391

Last edited: 2017-08-26 14:15

View 2 revisions

 @ The fix for 0018679 (r36095) introduces this behaviour.

I misunderstood your post from 2017-07-31 13:12, you made typo. It was report https://bugs.freepascal.org/view.php?id=30596 , not 36095. So the revision that introduced OnChange events on program startup was 53653 by Juha: https://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/lcl/interfaces/gtk2/gtk2callback.inc?root=lazarus&r1=53653&r2=53652&pathrev=53653

The issue for double OnChange of TFloatSpinEdit is there for ages, definitely pre r.51000.

Juha Manninen

2017-08-26 14:44

developer   ~0102392

Uhhh...
How to fix it? I would like to leave it for somebody else.

Vojtech Cihak

2018-04-01 16:15

reporter   ~0107513

Resolved in meanwhile? I saw today closed issue 32985 and I tried again SpinEditGTk demo. I cannot reproduce with Lazarus 1.9.0 r57588M FPC 3.0.4 x86_64-linux-qt.

I'd like to ask others to test, if OK we can close this.

Thanks

Juha Manninen

2018-09-11 00:40

developer   ~0110630

Ok, resolving.

Vojtech Cihak

2018-09-13 21:32

reporter   ~0110726

I tested again with Lazarus 1.9.0 r58967M FPC 3.3.1 x86_64-linux-qt

Works well. I close.

Issue History

Date Modified Username Field Change
2017-03-31 16:49 Vojtech Cihak New Issue
2017-03-31 16:49 Vojtech Cihak File Added: SpinEditGTk.zip
2017-04-08 14:41 Bart Broersma LazTarget => -
2017-04-08 14:41 Bart Broersma Note Added: 0099502
2017-04-08 14:41 Bart Broersma Status new => feedback
2017-04-10 20:05 Vojtech Cihak Note Added: 0099547
2017-04-10 20:05 Vojtech Cihak Status feedback => new
2017-04-10 21:58 Bart Broersma Note Added: 0099549
2017-04-11 16:30 Vojtech Cihak Note Added: 0099561
2017-07-31 12:07 Bart Broersma Note Added: 0102006
2017-07-31 12:07 Bart Broersma Note Edited: 0102006 View Revisions
2017-07-31 13:03 Bart Broersma Relationship added related to 0018679
2017-07-31 13:12 Bart Broersma Note Added: 0102007
2017-07-31 14:14 Bart Broersma Note Added: 0102008
2017-07-31 14:14 Bart Broersma Note Edited: 0102008 View Revisions
2017-07-31 14:14 Bart Broersma Note Edited: 0102008 View Revisions
2017-08-01 00:15 Bart Broersma Note Edited: 0102008 View Revisions
2017-08-01 01:20 Bart Broersma Note Added: 0102022
2017-08-01 01:20 Bart Broersma Note Edited: 0102022 View Revisions
2017-08-01 23:13 Bart Broersma Note Added: 0102026
2017-08-02 18:14 Bart Broersma Note Added: 0102040
2017-08-02 18:14 Bart Broersma Status new => feedback
2017-08-02 18:16 Bart Broersma File Added: spin.zip
2017-08-02 18:17 Bart Broersma Note Edited: 0102040 View Revisions
2017-08-02 18:18 Bart Broersma Note Edited: 0102040 View Revisions
2017-08-25 03:27 Vojtech Cihak Note Added: 0102357
2017-08-25 03:27 Vojtech Cihak Status feedback => new
2017-08-25 22:13 Bart Broersma Note Added: 0102382
2017-08-25 22:13 Bart Broersma Status new => feedback
2017-08-25 22:14 Bart Broersma Note Edited: 0102382 View Revisions
2017-08-26 01:41 Vojtech Cihak Note Added: 0102384
2017-08-26 01:41 Vojtech Cihak Status feedback => new
2017-08-26 14:14 Vojtech Cihak Note Added: 0102391
2017-08-26 14:15 Vojtech Cihak Note Edited: 0102391 View Revisions
2017-08-26 14:44 Juha Manninen Note Added: 0102392
2017-09-04 23:07 Bart Broersma Relationship added related to 0032368
2018-01-04 18:30 Juha Manninen Relationship added related to 0032196
2018-01-08 17:47 Bart Broersma Relationship added related to 0032975
2018-04-01 16:15 Vojtech Cihak Note Added: 0107513
2018-09-05 17:40 Juha Manninen Relationship added related to 0032669
2018-09-05 17:41 Juha Manninen Relationship added related to 0032602
2018-09-11 00:40 Juha Manninen Note Added: 0110630
2018-09-11 00:40 Juha Manninen Status new => resolved
2018-09-11 00:40 Juha Manninen Resolution open => fixed
2018-09-11 00:40 Juha Manninen Assigned To => Juha Manninen
2018-09-13 21:32 Vojtech Cihak Note Added: 0110726
2018-09-13 21:32 Vojtech Cihak Status resolved => closed