Review Request 109604: Model to provide easy access to KWin's Clients from QML

[Martin Gräßlin]

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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/109604/
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Review request for kwin and Plasma.


Description
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Model to provide easy access to KWin's Clients from QML

A new ClientModel is added which provides multiple different views on
KWin's Clients. The model is organized as a tree model supporting the
following levels:
* activities
* virtual desktops
* screens
* none

The levels can be ordered in whatever way one wants. That is the tree
structure can have an ordering of activities then virtual desktops or
the other way around.

In addition the model provides Exclude flags  to exclude clients of
certain types. E.g. it's possible to exclude all windows which are not on
the current desktop or all windows which are of type dock.

The model gets automatically updated whenever a Client is added/removed
or changes a state in a way that it should be excluded/included. This is
currently still rather limited, as some signals from KWin core are not
yet available. Also the model does not yet react on screen, desktop and
activity changes.

The ClientModel is not directly exported to QML. Instead there are
specific sub classes for certain common orderings. This solutions is
chosen to workaround some limitations of QML. The initial idea was to
use a property taking a list of the levels, but this doesn't work because
we are not notified when the QDeclarativeListProperty changes.

Currently the following models are provided to QML:
* ClientModel -> no restrictions
* ClientModelByScreen -> ordering by screen
* ClientModelByScreenAndDesktop -> screen, then desktop

These can be used to get all Clients:
ClientModel {
}

Or to get the classic Present Windows on current desktop:
ClientModelByScreen {
    excludes: ClientModel.ExcludeOtherDesktops | ClientModel.ExcludeNotAcceptingFocus | ...
}

Or to get the classic Present Windows on all desktops:
ClientModelByScreen {
    excludes: ClientModel.ExcludeNotAcceptingFocus | ...
}

Or our well known desktop grid:
ClientModelByScreenAndDesktop {
    id: desktopGrid
    excludes: ClientModel.ExcludeNotAcceptingFocus | ...
}

To support filtering as known by the Present Windows effect one can use
a ClientFilterModel, which is a QSortFilterProxyModel filtering on
window caption, role and class:
ClientFilterModel {
    id: filterModel
    clientModel: desktopGrid
    filter: filterItem.text
}

In case it's a tree level obviously QML does not support this correctly.
So we need to use a VisualDataModel:
VisualDataModel {
    id: clientModel
    model: filterModel
    Component.onCompleted: {
        clientModel.rootIndex = modelIndex(0);
        clientModel.rootIndex = modelIndex(0);
        clientModel.delegate = thumbnailDelegate;
    }
}

As we can see, the rootIndex has to be set to the level which contains
the Clients. Also it seems to be important to create the delegate after
the model index has been set. The idea is to have only one ClientModel
and multiple VisualDataModels if multiple views on the data is needed.

The model has been tested with a painful modeltest session. It looks good
so far modulo the listed limitations and that modeltest is not liking
closing Yakuake in the ClientModelByScreenAndDesktop setup, though it
works fine in real world testing.

===
Support saturation/brightness in ThumbnailItem

Two new properties saturation and brightness are added to the
ThumbnailItem which can be set from QML.

The properties are honoured by the Scene when rendering the thumbnail.
===

Plasma devs are added to get access to their QML knowledge :-)


Diffs
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  kwin/CMakeLists.txt ecddc55ed89cb4fcb143561e57534b1bb4ea3832 
  kwin/scene.cpp 939f000f0c3d09ffacccb0b25c50f83f0010ef47 
  kwin/scripting/scripting.cpp e124827174317ab6adbfdb90cec796a02e7bd2b7 
  kwin/scripting/scripting_model.h PRE-CREATION 
  kwin/scripting/scripting_model.cpp PRE-CREATION 
  kwin/thumbnailitem.h f7dc4fe621e9cf2786794d1be55930ce79ca5c7c 
  kwin/thumbnailitem.cpp 66b665a685188767201ada7d5cfbb32a0ea7ff0a 

Diff: http://git.reviewboard.kde.org/r/109604/diff/


Testing
-------


File Attachments
----------------

Example PresentWindows/DesktopGrid QML
  http://git.reviewboard.kde.org/media/uploaded/files/2013/03/20/main.qml
WindowItemComponent.qml - needed for the example
  http://git.reviewboard.kde.org/media/uploaded/files/2013/03/20/WindowItemComponent.qml


Thanks,

Martin Gräßlin

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