[Lazarus] Issues with apps on Linux...

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I have two questions regarding Lazarus applications on Linux (Ubuntu
18 Mate):

1) Clipboard content erased on close?
I have an application with a form where the form size anmd position is
stored into the clipboard on form close using a method of the form.
This method is also called on form resize.
The problem is that while the application runs the resize operations
cause the clipboard to be set up with the form size and it can be
pasted elsewhere.
But when the app is closed and the same function is called to save the
size to the clipboard the result is empty. Nothing to paste in another
application..
Is this how it must be on Linux?
On Windows the clipboard content is not erased...

2) Is there a way to make forms transparent on Linux?
Using the AlphaBlend and AlphaBlendValue do not wor while they do on
Windows.
Is there some other way on Linux to make the form body transparent?
I need to see the background through it since I want to "measure" the
object by moving the form on top and adjusting its size to fit.



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Bo Berglund
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Am 2020-11-30 14:34, schrieb Bo Berglund via lazarus:

> 1) Clipboard content erased on close?
> I have an application with a form where the form size anmd position is
> stored into the clipboard on form close using a method of the form.
> This method is also called on form resize.
> The problem is that while the application runs the resize operations
> cause the clipboard to be set up with the form size and it can be
> pasted elsewhere.
> But when the app is closed and the same function is called to save the
> size to the clipboard the result is empty. Nothing to paste in another
> application..
> Is this how it must be on Linux?
> On Windows the clipboard content is not erased...

I also only learned this quite recently and was surprised by this, but
yes, that is unfortunately how it works on X11. Pasting basically asks
the application that "copied" it to get the content. If that app is gone
in the meantime, there's nothing to paste anymore.

This will likely change with Wayland, but then it will also need some
unified API, which there is not yet, afaik.

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On Mon, Nov 30, 2020 at 8:12 PM Andreas Schneider via lazarus <[hidden email]> wrote:

I also only learned this quite recently and was surprised by this, but
yes, that is unfortunately how it works on X11. Pasting basically asks
the application that "copied" it to get the content. If that app is gone
in the meantime, there's nothing to paste anymore.

This will likely change with Wayland, but then it will also need some
unified API, which there is not yet, afaik.

Proper desktop systems have a clipboard manager which caches the data and essentially makes clipboard persistent.

At least my KDE Plasma has it. An app in the taskbar also shows clipboard history which can be browsed and selected. Thus it is better than a traditional clipboard.

I recommend such versatile desktops for anybody. At least KDE Plasma has been optimized over time and is now slim and fast. Memory consumption is not really more than with XFCE.

Once a user opens Firefox, it hogs more memory than any desktop, thus overturning any benefits a minimal desktop might have given.

Juha

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On Mon, 30 Nov 2020 22:08:39 +0200, Juha Manninen via lazarus
<[hidden email]> wrote:

>Once a user opens Firefox, it hogs more memory than any desktop, thus
>overturning any benefits a minimal desktop might have given.

 +1
On Windows I have to regularly shut down all instances of FireFox with
all of the tabs saved to a bookmark folder in order to clean up
networking.
It seems like FFx not only steals memory but also messes with
networking so that it is like "pouring molasses" over it...

Any ideas about transparent forms allowing look-through on Linux?
Works in Windows, but...


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Bo Berglund
Developer in Sweden

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On Mon, Nov 30, 2020 at 11:52 PM Bo Berglund via lazarus <[hidden email]> wrote:

On Mon, 30 Nov 2020 22:08:39 +0200, Juha Manninen via lazarus
<[hidden email]> wrote:

>Once a user opens Firefox, it hogs more memory than any desktop, thus
>overturning any benefits a minimal desktop might have given.

 +1
On Windows I have to regularly shut down all instances of FireFox with
all of the tabs saved to a bookmark folder in order to clean up
networking.
It seems like FFx not only steals memory but also messes with
networking so that it is like "pouring molasses" over it...

Any ideas about transparent forms allowing look-through on Linux?
Works in Windows, but...


--
Bo Berglund
Developer in Sweden

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In Fedora with KDE , if you press the left mouse button when the cursor is on the taskbar of a Lazarus form ( and all of the other open windows of applications ) it becomes transparent to be sufficient to see the underside  of it .

Mehmet Erol Sanliturk

 

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On Tue, Dec 1, 2020 at 12:02 AM Mehmet Erol Sanliturk <[hidden email]> wrote:

On Mon, Nov 30, 2020 at 11:52 PM Bo Berglund via lazarus <[hidden email]> wrote:

On Mon, 30 Nov 2020 22:08:39 +0200, Juha Manninen via lazarus
<[hidden email]> wrote:

>Once a user opens Firefox, it hogs more memory than any desktop, thus
>overturning any benefits a minimal desktop might have given.

 +1
On Windows I have to regularly shut down all instances of FireFox with
all of the tabs saved to a bookmark folder in order to clean up
networking.
It seems like FFx not only steals memory but also messes with
networking so that it is like "pouring molasses" over it...

Any ideas about transparent forms allowing look-through on Linux?
Works in Windows, but...


--
Bo Berglund
Developer in Sweden

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_______________________________________________

In Fedora with KDE , if you press the left mouse button when the cursor is on the taskbar of a Lazarus form ( and all of the other open windows of applications ) it becomes transparent to be sufficient to see the underside  of it .

I am sorry , not "taskbar`" but the "title bar" ...

 

Mehmet Erol Sanliturk

 

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On Mon, Nov 30, 2020 at 3:34 PM Bo Berglund via lazarus <[hidden email]> wrote:

I have two questions regarding Lazarus applications on Linux (Ubuntu
18 Mate):

2) Is there a way to make forms transparent on Linux?
Using the AlphaBlend and AlphaBlendValue do not wor while they do on
Windows.
Is there some other way on Linux to make the form body transparent?
I need to see the background through it since I want to "measure" the
object by moving the form on top and adjusting its size to fit.

AlphaBlend + AlphaBlendValue work here with both GTK2 and QT5 bindings.

It must be a Mate issue in your case.

Juha

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On Tue, 1 Dec 2020 00:02:09 +0300, Mehmet Erol Sanliturk via lazarus
<[hidden email]> wrote:

>In Fedora with KDE , if you press the left mouse button when the cursor is
>on the title bar of a Lazarus form ( and all of the other open windows of
>applications ) it becomes transparent to be sufficient to see the
>underside  of it .

Not so in Ubuntu Mate...


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Bo Berglund
Developer in Sweden

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