Android Open Source - piwik_android_sdk Touch Highlight Image Button

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License

The source code is released under:

MIT License

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Java Source Code

package com.anupcowkur.piwiksample;
/*from  w  ww .  jav  a2 s .  co m*/
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageButton;

public class TouchHighlightImageButton extends ImageButton {
    /**
     * The highlight drawable. This generally a {@link android.graphics.drawable.StateListDrawable}
     * that's transparent in the default state, and contains a semi-transparent overlay
     * for the focused and pressed states.
     */
    private Drawable mForegroundDrawable;
    /**
     * The cached bounds of the view.
     */
    private Rect mCachedBounds = new Rect();

    public TouchHighlightImageButton(Context context) {
        super(context);
        init();
    }

    /**
     * General view initialization used common to all constructors of the view.
     */
    private void init() {
        // Reset default ImageButton background and padding.
        setBackgroundColor(0);
        setPadding(0, 0, 0, 0);

        // Retrieve the drawable resource assigned to the android.R.attr.selectableItemBackground
        // theme attribute from the current theme.
        TypedArray a = getContext().obtainStyledAttributes(new int[]{android.R.attr.selectableItemBackground});
        mForegroundDrawable = a.getDrawable(0);
        mForegroundDrawable.setCallback(this);
        a.recycle();
    }

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

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

    @Override
    protected void drawableStateChanged() {
        super.drawableStateChanged();

        // Update the state of the highlight drawable to match
        // the state of the button.
        if (mForegroundDrawable.isStateful()) {
            mForegroundDrawable.setState(getDrawableState());
        }

        // Trigger a redraw.
        invalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // First draw the image.
        super.onDraw(canvas);

        // Then draw the highlight on top of it. If the button is neither focused
        // nor pressed, the drawable will be transparent, so just the image
        // will be drawn.
        mForegroundDrawable.setBounds(mCachedBounds);
        mForegroundDrawable.draw(canvas);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        // Cache the view bounds.
        mCachedBounds.set(0, 0, w, h);
    }
}

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