onmousedown event not registering correctly

[CyberFilth]

I've recently made an application in Windows that compiles fine but the Linux version is causing me issues.
The source and binaries are here https://sourceforge.net/projects/lazlock/files/2.0.0.3/

The TListView on the top right updates the display when left-clicked, using an OnMouseDown event.
On Linux you need to double-click to trigger the same event.

I've compiled it under 32 bit Bunsen Labs and 64 bit Lubuntu and the behaviour is the same.

The Windows 32 & 64 bit binaries work correctly with just a single click however.

Does anyone have an idea why the Linux versions aren't working correctly?

[Handoko]

I downloaded and tested your program. I confirm it happens on my Ubuntu Mate 64-bit.

Without looking into your code, nothing much we can say. Can you share your code? A stripped-down version or a short demo is okay.

I ever have mouse event issue which I think is similar to yours. If I'm not wrong, I fixed (?) it by adding some more events to detect the mouse behavior.

[CyberFilth]

The relevant piece of code is here

Code: Pascal  [Select][+][-]

1. procedure TmainLazLock.ListView1MouseDown(Sender: TObject; Button: TMouseButton;
2.   Shift: TShiftState; X, Y: integer);
3. var
4.   image: integer;
5. begin
6.   if ListView1.Selected <> nil then // Avoids error when a blank line is selected
7.   begin
8.     ResultName.Caption := ListView1.selected.SubItems[0];
9.     ResultURL.Text := ListView1.selected.SubItems[1];
10.     ResultUser.Text := ListView1.selected.SubItems[2];
11.     ResultPassword.Text := ListView1.selected.SubItems[3];
12.     image := StrToInt(ListView1.selected.SubItems[4]);
13.     sitesImageList.GetBitmap(image, ResultImage.Picture.Bitmap);
14.   end;
15.   TBEditEntry.Enabled := True; // Allows selected entry to be edited
16.   TBRemove.Enabled := True; // or deleted
17.   mnuEdit.Enabled := True;  // Dropdown menu options
18.   mnuDelete.Enabled := True;
19. end;  

I originally used OnClick to update the display but switched to OnMouseDown so that it would work with the right-click menu.

[CyberFilth]

The full source code is here https://sourceforge.net/projects/lazlock/files/2.0.0.3/source/ in the unitmain.pas unit, line 664

[CyberFilth]

I tried your idea of adding more events and including an OnSelectItem fixes the left click issue. Only a single click is now needed.
It doesn't solve the right click menu however. That still needs to be double-clicked...

[Handoko]

Although, I can't open the the .lfm to check the component properties (you haven't provide all the files for security reasons). But from the code you provided, I didn't find anything wrong in your code.

You may submit a bug report to here:
http://bugs.freepascal.org/my_view_page.php

[Windsurfer]

I have problems detecting some key presses in Linux when using GTK. I read somewhere recently that it may be fixed in GTK 3 or 5. I can't remember which.

If you change to QT the problems may be solved, but you will have to accept the different appearance.

I use Linux Mint 17.3 Cinnamon.

[CyberFilth]

I'll see if I can compile it in QT later today then submit a bug report.
Thanks

[Thaddy]

Unless the code involved indeed needs to track something while the mouse is down, use mouseUp instead.

[CyberFilth]

Adding an OnMouseUp event didn't change anything but compiling it with a QT interface works perfectly!
Thanks to all of you for the suggestions.

The binaries are here https://sourceforge.net/projects/lazlock/files/2.0.1.0/