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| While the basic format of Plasma themes has not changed since the first version of Plasma, by the time in Plasma 5 some backward-incompatible changes happened for the range of elements expected in the themes. Here is a list of the changes, please supplement if changes are missing.
| | this page was moved to https://develop.kde.org/docs/plasma/theme/theme-porting-to-plasma5/ |
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| == KRunner ==
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| '''dialogs/krunner''' is no longer used by KRunner, instead '''dialogs/background''' is applied.
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| Changes to do:
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| * remove '''dialogs/krunner''' SVGs
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| == Logout/Shutdown dialog ==
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| '''dialogs/shutdowndialog''' is no longer used. Instead the the implementation of "logoutmainscript" of the active Plasma LookAndFeel package defines the look of that dialog, with the default Breeze implementation not using any special theme elements.
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| Changes to do:
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| * remove '''dialogs/shutdowndialog''' SVGs
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| == Panel background ==
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| The "*-mini-*" variants from the '''widgets/panel-background''' SVGs are no longer applied, instead always the normal "[prefix-]*" elements are used.
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| Changes to do:
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| * remove all "*-mini-*" variants
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| * ensure all the "[prefix-]*" elements include the potential borders (e.g. the "north-*" ones have the "*left*", "*bottom*" & "*right*" ones)
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| (often simply renaming the "*-mini-*" variants to their non-mini counterparts and removing the old ones before is all to do)
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| == Analog clock ==
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| The rotation center of a hand (shadow) element now defaults to its "(width/2,width/2)" point from the top-left of the element, no longer is the the y-axis position of the elements with respect to the center of ClockFace taken into account. Since Plasma 5.16 the hints "hint-[hand(shadow)]-rotation-center-offset" (with "[hand(shadow)]" being "hourhand", "hourhandshadow", "minutehand", "minutehandshadow", "secondhand", "secondhandshadow") allow to define a custom relative point (can also be outside the element).
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| Also has the hard-coded relative offset of the optional shadow elements for the hands been changed a few times. Since Plasma 5.16 it defaults to (0,0) and can be overwritten by the "hint-hands-shadow-offset-to-west/hint-hands-shadows-offset-to-east" and "hint-hands-shadow-offset-to-north/hint-hands-shadow-offset-to-south" hints.
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| Changes to do:
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| * if the default "(width/2,width/2)" relative rotation center point of a hand does not match: either add transparent padding area to the hand as needed or, recommended for Plasma >= 5.16, define a "hint-[hand(shadow)]-rotation-center-offset" element, e.g. by adding a circle whose center marks the relative rotation center
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| * if there are shadows elements and the default (0,0) offset does not match the theme's light model: define ""hint-hands-shadow-offset-to-*" elements for the shadow offset
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| == Notes ==
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| The notes applet no longer uses the complete '''widgets/notes''' SVG file as shape for a note. Instead it expects 10 elements in the '''widgets/notes''' SVG, one note shape element with name "[color]-notes" per each supported color: "white", "black", "red", "orange", "yellow", "green", "blue", "pink", "translucent", "translucent-light".
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| Changes to do:
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| * name the existing shape with a name for a matching color
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| * add 9 more variants for all the missing colors
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| == Extender ==
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| The '''widgets/extender-background''' SVG is no longer used.
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| Changes to do:
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| * remove '''widgets/extender-background''' SVGs
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| == Shadows (panels, tooltips, dialogs) ==
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| The window/compositing manager no longer automatically adds shadows to windows. But leaves it to the windows to provide shadow pixmaps matching the light model of the current theme.
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| Changes to do:
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| * add shadow elements & hints to the SVGs of '''dialogs/background''', '''widgets/panel-background''', '''widgets/tooltip''' (see [[Development/Tutorials/Plasma5/ThemeDetails|Details]])
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| == Borders and content margins (panels, tooltips, dialogs) ==
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| Plasma code now has the assumption that the value of the full width of the border element (or the "[prefix]-hint-[direction]-margin" override) can also be interpreted as content margin when the border is not enabled. So effectively assuming that visual border itself is almost of 0 width, and the margin is just that, the margin between edge and content. This was done to simplify the code when any window-like elements where shown bounded to a screen edge, where then the related border would be disabled (which again would mean another window size if turning off the border would affect the window size).
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| On the sides where the border is disabled, the content then gets a padding with a value of the border element width (or "[prefix]-hint-[direction]-margin" override) over the center element.
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| Changes to do:
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| * make sure the visual borders of frames are as slim as possible, so that the full border element width works also as content margin value when the border element itself is not used (consider also use of "[prefix]-hint-[direction]-margin"), e.g. for '''dialogs/background''', '''widgets/panel-background''', '''widgets/tooltip'''
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