Is it possible to know when a PlasmaCore IconItem is ready?

[Michail Vourlakos]

PlasmaCore.IconItem {
        id: iconImage

        width:64
        height:64

        anchors.centerIn: parent


    }

    DropShadow {
        id:shadowImageNoActive

        width: 64
        height: 64

        scale: wrapper.scale * wrapper.appearScale

        anchors.centerIn: parent

        radius: 7.0
        samples: 10
        color: "#90080808"
        source: ShaderEffectSource {
            id:effectSource
            width: iconImage.width
            height: iconImage.height
            sourceItem: iconImage
            hideSource: true
            live: false
        }

    }

On 7/29/16, David Edmundson <david at davidedmundson.co.uk> wrote:
> Given you already have
>
> usePlasmaTheme:false
>
> does using QIconItem from KQuickControlsAddons work any better?
>
> David
>
> On Fri, Jul 29, 2016 at 4:35 PM, Michail Vourlakos <mvourlakos at gmail.com>
> wrote:
>
>> >
>> > Move the IconItem outside the DropShadow.
>> > Otherwise you're scaling the source still, which is what we want to
>> avoid.
>> >
>> > Out of curiosity, how are you measuring performance?
>> >
>>
>> David even this way I get the same bad performance... This is the code
>> inside a task delegate. I have implemented a qml plasmoid that acts as
>> an alternative task list but it mimics the plank animation or mac
>> style. The main animation in this case is when the user hovers a task
>> and that task is zoomed and its neighbour tasks also. Most of the code
>> is based on the current tasks plasmoid of 5.7 except the appearance
>> and the animations.
>>
>> To check the performance I install the plasmoid with "plasmapkg2 -u "
>> and after that I use plasmawindowed to watch it. After that I open
>> ksysguard and I watch the cpu% that is used when then user hovers the
>> tasks and goes its mouse on the task list back and forth. With the
>> following code my sluggish old netbook reaches and remain at around
>> 80% of cpu cycles when the user hovers tasks in that list, and
>> actually there is no smooth animation at all. With the Images solution
>> I sent earlier this is at 40% cpu in the same hardware and there is a
>> smooth hovering animation.
>>
>> In my main computer at the office with the following solution I get
>> around 25% of cpu with smooth animation but with the Images solution I
>> get maximum 9% of cpu
>>
>>
>> -----------------------------------
>>  PlasmaCore.IconItem {
>>         id: iconImage
>>
>>         width:64
>>         height:64
>>
>>         anchors.centerIn: parent
>>
>>         active: true
>>         enabled: true
>>         usesPlasmaTheme: false
>>
>>         source: decoration
>>
>>     }
>>
>>     DropShadow {
>>         id:shadowImageNoActive
>>
>>         width: 64
>>         height: 64
>>
>>         scale: wrapper.scale * wrapper.appearScale
>>
>>         anchors.centerIn: parent
>>
>>         radius: 7.0
>>         samples: 10
>>         color: "#90080808"
>>         source: ShaderEffectSource {
>>             id:effectSource
>>             width: iconImage.width
>>             height: iconImage.height
>>             sourceItem: iconImage
>>             hideSource: true
>>             live: false
>>         }
>>
>>     }
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>