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rofi: Launch programs with DPI-based cursor size

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Now it is possible to take advantage of different cursor sizes
without restarting the X session.
This commit is contained in:
Donovan Glover 2018-12-22 15:41:02 -05:00
parent b083794a19
commit 49e6b75969
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GPG Key ID: EA7408A77AE1BE65
1 changed files with 36 additions and 0 deletions
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36
rofi/.config/rofi/launch.sh
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@ -11,10 +11,45 @@
# respects its theming even when XDG_CURRENT_DESKTOP is not set to it
# (through settings.ini).
# Note that the xcursor size is specified with:
#
# 1. The X server resource database (xrdb), of which cursor size is
# only applied BEFORE your window manager starts
# 2. The xsetroot command, which affects the cursor shown on the root
# window (your desktop)
# 3. The XCURSOR_SIZE environment variable, which affects the current
# program
#
# There are a few things to take away from this:
#
# 1. The root window (desktop) cursor size MUST be changed with xsetroot
# 2. KDE applications will honor XCURSOR_SIZE but NOT xsetroot
# 3. GTK applications will honor xsetroot but NOT XCURSOR_SIZE
#
# Additionally,
#
# 4. SOME X applications require XCURSOR_SIZE to be set and will NOT
# honor xsetroot
# 5. SOME X applications require xsetroot to be set and will NOT
# honor XCURSOR_SIZE
#
# So for a consistent variable cursor DPI environment, one has to set BOTH
# xsetroot and XCURSOR_SIZE
#
# Note that existing windows will NOT have their X cursor size changed
# if they don't depend on xsetroot. Because of this, and because of the
# fact that active windows will not handle DPI changes anyway, you should
# probably have no GUIs running when switching DPI.
ROFI_DPI=$(xrdb -query | grep Xft.dpi | cut -f 2)
ROFI_SCALE=$(expr $ROFI_DPI / 96)
ROFI_DPI_SCALE=$(awk "BEGIN { print "1/$ROFI_SCALE" }")
CURSOR_THEME=${XCURSOR_THEME:-breeze_cursors}
CURSOR_SIZE=$((16 * $ROFI_SCALE))
xsetroot -xcf "/usr/share/icons/$CURSOR_THEME/cursors/left_ptr" "$CURSOR_SIZE"
env \
XDG_CURRENT_DESKTOP="KDE" \
QT_AUTO_SCREEN_SCALE_FACTOR="0" \
@ -22,6 +57,7 @@ env \
QT_SCREEN_SCALE_FACTORS="VGA-1=$ROFI_SCALE;" \
GDK_SCALE="$ROFI_SCALE" \
GDK_DPI_SCALE="$ROFI_DPI_SCALE" \
XCURSOR_SIZE="$CURSOR_SIZE" \
rofi \
-show drun \
-dpi "$ROFI_DPI"