Android Open Source - android-movies-demo Sliding Reveal View Group

• Back to Animation/demo  ↑

From Project

Back to project page android-movies-demo.

License

The source code is released under:

MIT License

Java Source Code

package com.idunnolol.moviesdemo.view;
//from   w ww .  j  a v  a2s  .c om
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.RelativeLayout;

import com.idunnolol.moviesdemo.R;

/**
 * Holds two views which "slide" open
 *
 * It is constructed via three view:
 * 0 - A Spacer.  This represents the space the cover takes up when slid out.
 * 1 - The sliding view.  This hides itself.
 * 2 - The cover view.  This is always visible.
 */
public class SlidingRevealViewGroup extends RelativeLayout {

  public enum Reveal {
    LEFT,
    RIGHT
  }

  // Which side to reveal
  private Reveal mReveal;

  // Represents how far in we are sliding; 0% == totally revealed, 100% == totally hidden
  private float mRevealPercent;

  // Internal Views
  private View mSpaceView;
  private View mSlidingView;
  private View mCoverView;
  private View mSlideOverlayLeft;
  private View mSlideOverlayMiddle;
  private View mSlideOverlayRight;

  public SlidingRevealViewGroup(Context context) {
    this(context, null);
  }

  public SlidingRevealViewGroup(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

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

  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
    super.onLayout(changed, l, t, r, b);

    if (changed) {
      updateSlide();
    }
  }

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

    mSpaceView = getChildAt(0);
    mSlidingView = getChildAt(1);
    mCoverView = getChildAt(2);

    mSlideOverlayLeft = findViewById(R.id.slide_overlay_left);
    mSlideOverlayMiddle = findViewById(R.id.slide_overlay_middle);
    mSlideOverlayRight = findViewById(R.id.slide_overlay_right);
  }

  public void setReveal(Reveal reveal) {
    mReveal = reveal;
  }

  public void setRevealPercent(float revealPercent) {
    mRevealPercent = revealPercent;

    updateSlide();
  }

  public float getRevealPercent() {
    return mRevealPercent;
  }

  public float getSlideRevealX() {
    return mSlidingView.getWidth() - Math.abs(mSlidingView.getTranslationX())
        - (mCoverView.getWidth() - mSpaceView.getWidth());
  }

  public float getSlideHideX() {
    return getWidth() - mCoverView.getWidth();
  }

  private void updateSlide() {
    int width = getWidth();
    if (width == 0) {
      // We haven't measured yet; wait until measurement to slide
      return;
    }

    // Hide part of the cover, based on the spacer
    int widthDiff = mCoverView.getWidth() - mSpaceView.getWidth();
    float coverTransX = mRevealPercent * widthDiff;
    mCoverView.setTranslationX(mReveal == Reveal.RIGHT ? -coverTransX : coverTransX);

    // Slide to reveal the View
    //
    // We need to take into account the cover sliding as well, so that the moment
    // you start sliding over, the cover doesn't keep hiding things
    float coverLeftoverX = (1 - mRevealPercent) * widthDiff;
    float translationX = (1 - mRevealPercent) * mSlidingView.getWidth() - coverLeftoverX;
    mSlidingView.setTranslationX(mReveal == Reveal.RIGHT ? -translationX : translationX);

    // Slide the middle so that its right edge is underneath what is revealed
    // Slide the right so that it's always on the right corner
    // TODO: This doesn't work for Reveal.LEFT
    mSlideOverlayMiddle.setTranslationX(-translationX);
    mSlideOverlayRight.setTranslationX(-translationX);

    onUpdateSlide();
  }

  protected void onUpdateSlide() {
    // For subclasses to implement if necessary
  }

  public void setUseHardwareLayers(boolean useHardwareLayers) {
    // For subclasses to initialize hardware layers during animations

    int toLayerType = useHardwareLayers ? View.LAYER_TYPE_HARDWARE : View.LAYER_TYPE_NONE;
    mSlideOverlayLeft.setLayerType(toLayerType, null);
    mSlideOverlayMiddle.setLayerType(toLayerType, null);
    mSlideOverlayRight.setLayerType(toLayerType, null);
  }
}

Java Source Code List

• Back to Animation/demo  ↑