Hi

When higher DPI setting is used on Windows, Lazarus IDE appears to obey nicely. All icons are also scaled, together with texts.

On my Linux + KDE system however icons of the IDE's main menuitems do not scale. In KDE settings panel -> Fonts I set the "Force font's DPI" value to 144 which is about 150%.
Then I start lazarus and everything is scaled including menu texts but not the icons beside them. Icons everywhere else like in the IDE Coolbar and component palette are scaled. Editor toolbar also has scaled icons and the exact same icons show smaller in the main menu. This happens with both GTK2 and QT bindings.
Could somebody please test with other desktop / window manager systems. Who knows the High DPI code well enough to fix the issue?

I wanted to take a screenshot but the IDE's menus always close when Spectacle (screeshot app) takes it. This is another bug somewhere. Menus of well behaving KDE apps, for example Kate's, do not close.

Juha

It seems the same here (KDE and Lazarus Qt4). I was able to take screenshot with Spectacle (rectangular area).  
V.

Juha Manninen wrote

I wanted to take a screenshot but the IDE's menus always close when Spectacle (screeshot app) takes it.

Do you use a delay?
https://userbase.kde.org/Spectacle#Screenshot_delay

Martin

AM Martin Schreiber wrote

Do you use a delay? https://userbase.kde.org/Spectacle#Screenshot_delay

Yes I did. I tried all variations including the rectangular area that Vojtěch Čihák used.
Strangely enough, I remember I could include menus in a screenshot earlier. Something has changed maybe in the libs provided by Manjaro. Who knows...
I will test again some time later.

Juha

  On my Linux + KDE system however icons of the IDE's main menuitems

do not scale.

In KDE settings panel -> Fonts I set the "Force font's DPI" value to

144 which is about 150%.

I remember I worked on it:

1.) Gtk2: I added support for Gtk2. See screenshot. It works well for me if I use "xrandr --dpi 144x144" as it is suggested in http://wiki.lazarus.freepascal.org/High_DPI

Your settings revealed a bug in Gtk2 bindings. Patch is attached.

2.) Qt: I wasn't able to add support of high-resolution icons in menus under Qt. My conclusion was that either Qt itself or LCL-Qt bindings do not support big icons in menus. When I used the correct size icon in the menu it was always (badly) downscaled to 16x16 pixels.

Greetings
Ondrej

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Index: lcl/interfaces/gtk2/gtk2winapi.inc
=================================================================== --- lcl/interfaces/gtk2/gtk2winapi.inc (revision 59319) +++ lcl/interfaces/gtk2/gtk2winapi.inc (working copy) @@ -4723,10 +4723,10 @@

   //we will also have to add internal support for Papersizes etc..

   LOGPIXELSX : { Logical pixels per inch in X }
-    Result := RoundToInt(gdk_screen_width / (GetScreenWidthMM / 25.4));
+    Result := ScreenInfo.PixelsPerInchX;
   LOGPIXELSY : { Logical pixels per inch in Y }
-    Result := RoundToInt(gdk_screen_height / (GetScreenHeightMM / 25.4));
+    Result := ScreenInfo.PixelsPerInchY;

SIZEPALETTE: { number of entries in color palette }

     if GetVisual then

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Probably the only solution is to use QProxyStyle class. There's no QProxyStyle class in Qt4/Qt5 C bindings and to fix this problem it should be implemented with it's overrides. QProxyStyle can return any size for PM_SmallIconSize, but in that case we should know what's the current size of "normal" icons in LCL.

zeljko

zeljko wrote

QProxyStyle can return any size for PM_SmallIconSize, but in that case we should know what's the current size of "normal" icons in LCL.

The current size of "normal" icons in LCL is perfectly known, as well as the size of any menu icon in LCL. Call the TMenuItem.GetIconSize function to get it.

Ondrej

Tnx

zeljko

AM Ondrej Pokorny wrote

Your settings revealed a bug in Gtk2 bindings. Patch is attached.

Applied in r59325. It works now with GTK2. Very nice, thanks!

Juha