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Editorial Team
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Asked: 2026-06-15T17:07:38+00:00

I have an application that switched between different graphs in Flex. Each graph is

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I have an application that switched between different graphs in Flex. Each graph is it’s own state. In the MXML I have it set so that the source of the image change when the state changes:

<s:Image id="chartImage"
         source.all="{ callImages.all }"
         source.classA="{ callImages.classB }"
         source.classB="{ callImages.classA }"
         />

I have buttons that successfully change the images. However, I have a small bug which occurs because after the line

this.currentState = chartName;

My code expected the graph image source to be changed, however the actual change to the s:Image element doesn’t appear to happen until after the function ends and the screen updates, I assume. So when it grabs chartImage.height, it uses the old one from the state I just left.

Is there a way to have it get the new image (and thus it’s dimensions) so I can do calculations with those dimensions on the next line? So far, chartImage.height returns the height from before the state change, but it is different after the function executes.

I could run a timmer after a fraction of a second then execute the lines there, and it would work. However, I’d rather tell it to render the screen and then continue my code. Is this possible? It just seems more elegant.

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1 Answer

  1. Editorial Team

    Is there a way to have it get the new image (and thus it’s dimensions)
    so I can do calculations with those dimensions on the next line?

    Each Flex component must go through it’s own validation cycle, which is built on top of the Flash Player’s rendering mechanism. There are some great posts out on this, if you perform a Google search for the Flash/Flex Elastic Racetrack.

    However, you can force a component to run through it’s validation methods in a linear manner by calling the validateNow() method.

    It is possible–especially if you have a state transition–that the properties on your Image have not changed yet after you set the currentState variable.

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