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androidrippledrawable

Where calculating RippleDrawable radius wtih RADIUS_AUTO

Docs says Radius value that specifies the ripple radius should be computed based on the size of the ripple's container. but i can't find exactly where it calculating. I tried to fugire it out with debugger but unsuccesful.

Can you tell me where this calculation take place?

Solution

  • I found it. That calculation perform in setup(float, int) method of RippleComponent class:

    public final void setup(float maxRadius, int densityDpi) {
    if (maxRadius >= 0) {
        mHasMaxRadius = true;
        mTargetRadius = maxRadius;
    } else {
        mTargetRadius = getTargetRadius(mBounds); // this place!
    }

    mDensityScale = densityDpi * DisplayMetrics.DENSITY_DEFAULT_SCALE;

    onTargetRadiusChanged(mTargetRadius);
}

    Exactly this class handles size and positioning common to the ripple & focus states. Neither RippleState nor RippleDrawable.