What Control Has The Lowest Resource Usage?

General
1

I just spent quite a while trying to find out why my drag and drop events were not working on my ContainerControls, after looking I found it is a known issue: <https://xojo.com/issue/16577>

While I wait for this to be fixed, I need a control that will accept the drag enter/exit and drop events. I see some people have used the Canvas control but I would guess that it would use quite a few resources. Does anyone know what transparent control is the least resource-intensive? I was thinking rectangle but I am not sure how it works under the hood.

Thanks!

2

Why should an empty canvas use many resources? I’m using the workaround myself. In DragEnter and DragExit I set a property DragState and the paint event in the Canvas makes a nice round rectangle during the drag:

[code]if DragState <> 0 then

g.PenSize = 3

g.DrawingColor = colors.getWindowBackgroundColorLight
g.DrawRoundRectangle(1, 1, g.Width, g.Height, 10, 10)

g.DrawingColor = colors.getWindowBackgroundColor
g.DrawRoundRectangle(0, 0, g.Width - 1, g.Height - 1, 10, 10)

Else
'don’t draw anything
end if[/code]

3

[quote=457972:@Beatrix Willius]Why should an empty canvas use many resources? I’m using the workaround myself. In DragEnter and DragExit I set a property DragState and the paint event in the Canvas makes a nice round rectangle during the drag:

[code]if DragState <> 0 then

g.PenSize = 3

g.DrawingColor = colors.getWindowBackgroundColorLight
g.DrawRoundRectangle(1, 1, g.Width, g.Height, 10, 10)

g.DrawingColor = colors.getWindowBackgroundColor
g.DrawRoundRectangle(0, 0, g.Width - 1, g.Height - 1, 10, 10)

Else
'don’t draw anything
end if[/code][/quote]

I assume a blank canvas would use very little resources, however, im going to need quite a few of them so im looking for the best control. I’m not sure if a rectange is actually a canvas that draws a rectangle or a different control that is faster for the UI to draw. I don’t actually need anything to be drawn.

Thanks

4

Hi Alex,

Maybe this picture can be of help for you. It shows the hierarchy of controls (Desktop). Canvas and Rectangle are both subclasses from the RectControl class.

https://documentation.xojo.com/File:DesktopControlHierarchy.png

5

[quote=457976:@Javier Menéndez]Hi Alex,

Maybe this picture can be of help for you. It shows the hierarchy of controls (Desktop). Canvas and Rectangle are both subclasses from the RectControl class.

https://documentation.xojo.com/File:DesktopControlHierarchy.png[/quote]

Great help, thanks!