Android Open Source - AnAudioPlayer Uzumaki Arm Head

From Project

Back to project page AnAudioPlayer.

License

The source code is released under:

MIT License

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Java Source Code

package jp.gr.java_conf.neko_daisuki.android.widget;
/* w  w w  .  java2  s.c o  m*/
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

/**
 * An instance of this class must have two children. The first child is assumed
 * as an arm. The second child is a head.
 */
public class UzumakiArmHead extends ViewGroup implements UzumakiHead {

    public UzumakiArmHead(Context context) {
        super(context);
    }

    public UzumakiArmHead(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public UzumakiArmHead(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public void setSlider(UzumakiSlider slider) {
        getHead().setSlider(slider);
    }

    public void movePointer(int x, int y, int l, int t, int r, int b) {
        int width = getHead().getDrawable().getMinimumWidth();
        layout(x - width / 2, t, r, y);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int width = r - l;
        int height = b - t;
        layoutHead(0, 0, width, height);
        layoutArm(0, 0, width, height);
    }

    private void layoutHead(int l, int t, int r, int b) {
        ImageView head = getHead();
        Drawable drawable = head.getDrawable();
        int width = drawable.getMinimumWidth();
        int height = drawable.getMinimumHeight();
        head.layout(l, b - height, l + width, b);
    }

    private int getBackgroundWidth(View view) {
        /*
         * What is this?
         * =============
         *
         * View.getBackground() returns null at first. Android must delay
         * reading background resource. This method was added for this case with
         * returning zero. Width of zero is harmless.
         */
        Drawable drawable = view.getBackground();
        return drawable != null ? drawable.getMinimumWidth() : 0;
    }

    private void layoutArm(int l, int t, int r, int b) {
        View arm = getArm();
        int width = getBackgroundWidth(arm);
        int left = l + getHalfOfHeadWidth() - width / 2;
        int bottom = b - getHalfOfHeadHeight();
        arm.layout(left, t, r, bottom);
    }

    private Drawable getDrawableOfHead() {
        return getHead().getDrawable();
    }

    private int getHalfOfHeadWidth() {
        return getDrawableOfHead().getMinimumWidth() / 2;
    }

    private int getHalfOfHeadHeight() {
        return getDrawableOfHead().getMinimumHeight() / 2;
    }

    private View getArm() {
        return getChildAt(0);
    }

    private UzumakiImageHead getHead() {
        return (UzumakiImageHead)getChildAt(1);
    }
}

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Java Source Code List