Bug 368384

For the user to overwrite, it should be in the theme and I'm not going to add any options there.


For the containment to overwrite it - that seems sensible - we have a backgroundHints flag in AppletInterface that we could repurpose for containments.

We'd want to change views/Panel.qml

Theoretically this is just changing

-    imagePath: "widgets/panel-background"
+    imagePath: containment.backgroundHints & Plasma.StandardBackground ? "widgets/panel-background" : ""

But there's additionally a slightly weird quirk that drawing the panel background happens in panel.qml; the shadow for said background happens in the view (panelview.cpp); which isn't ideal as it's tie-in that isn't semantically correct.

Also feel free to make patches to Plasma as well as working on your own applet.

David some update in this,

I tried your code but didnt find any success...

I even tried,

imagePath: "" // this code just gives transparency to the panels, it doesnt make them fully transparent

the code part,
Plasma.StandardBackground //hits a warning that Plasma object is not identified

for my Panel code I tried to set,
Plasmoid.backgroundHints: "NoBackground";    ///which is found in some plasmoids code

so I also tried in Panel.qml the following:
imagePath: containment && containment.backgroundHints !== "NoBackground" ? "widgets/panel-background" : ""

but I didnt have any success...

Sorry, small update...

I had "Blur" and "Background Contrast" effects enabled, I disabled them and now I can play with it...

Ok small good update...

imagePath: containment && containment.backgroundHints === PlasmaCore.Types.NoBackground ? "" : "widgets/panel-background"

works for me and in my panel I add:
Plasmoid.backgroundHints: PlasmaCore.Types.NoBackground;

------
David any idea for the shadows?
Why not add them from the panelview.cpp to the Panel.qml? this would allow also to disable them for PlasmaCore.Types.NoBackground... Has something to do with Kwin and and panel(window) counting?

David,

I have sent this: https://phabricator.kde.org/D3282

in order to open the discussion for transparent panels, disabling their shadows and disabling blur and background contrast for these panels...

and also this: https://phabricator.kde.org/D3283

I have updated...

https://phabricator.kde.org/D3282
https://phabricator.kde.org/D3283

Git commit 341a534e9d16eaf89f137136bdbff5756db78775 by Michail Vourlakos.
Committed on 13/11/2016 at 17:23.
Pushed by mvourlakos into branch 'master'.

add backgroundHints for the panel view

Summary:
This patch adds a variable called "backgroundHints"
which can be used with (NoBackground) through qml
in order to enable/disable the KWin effects for
a specific panel and the panel shadows in case the
effects are disabled.
Currently these effects are (Blur and Background Contrast)

Reviewers: #plasma, #davidedmundson

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D3282

M  +64   -34   shell/panelview.cpp
M  +12   -0    shell/panelview.h

http://commits.kde.org/plasma-workspace/341a534e9d16eaf89f137136bdbff5756db78775

Git commit b1bc4f8347fca280d7c44b2e76a40f9a7bdc44d4 by Michail Vourlakos.
Committed on 13/11/2016 at 17:35.
Pushed by mvourlakos into branch 'master'.

Hide Background for Panel if backgroundHints used

Summary:
a Panel can set,
Plasmoid.backgroundHints: PlasmaCore.Types.NoBackground;
in order to become transparent

Reviewers: #plasma, #davidedmundson

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D3283

M  +13   -1    desktoppackage/contents/views/Panel.qml

http://commits.kde.org/plasma-desktop/b1bc4f8347fca280d7c44b2e76a40f9a7bdc44d4