Android Open Source - FPlayAndroid State Drawable

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The source code is released under:
Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the followin...
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Java Source Code

//
// FPlayAndroid is distributed under the FreeBSD License
///*from   www.  j ava 2s .  co  m*/
// Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
//
// https://github.com/carlosrafaelgn/FPlayAndroid
//
package br.com.carlosrafaelgn.fplay.ui.drawable;

import android.annotation.TargetApi;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.Region;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.StateSet;

import br.com.carlosrafaelgn.fplay.ui.UI;

public final class StateDrawable extends Drawable {
  private final Drawable normal, altered, checked, checkedAltered;
  private final boolean hasChecks;
  private int[] stateSet;
  private int opacity, state, alpha;
  private boolean dither;
  private ColorFilter cf;
  private Drawable current;
  
  public StateDrawable(Drawable normal, Drawable altered) {
    this.normal = normal;
    this.altered = altered;
    this.checked = null;
    this.checkedAltered = null;
    this.hasChecks = false;
    this.stateSet = StateSet.WILD_CARD;
    computeCurrent();
  }
  
  public StateDrawable(Drawable normal, Drawable altered, Drawable checked, Drawable checkedAltered) {
    this.normal = normal;
    this.altered = altered;
    this.checked = checked;
    this.checkedAltered = checkedAltered;
    this.hasChecks = ((checked != null) || (checkedAltered != null));
    this.stateSet = StateSet.WILD_CARD;
    computeCurrent();
  }
  
  private StateDrawable(Drawable normal, Drawable altered, Drawable checked, Drawable checkedAltered, int state, int[] stateSet) {
    this.normal = normal;
    this.altered = altered;
    this.checked = checked;
    this.checkedAltered = checkedAltered;
    this.hasChecks = ((checked != null) || (checkedAltered != null));
    this.state = state;
    this.stateSet = stateSet;
    computeCurrent();
  }
  
  private Drawable computeCurrent() {
    if (hasChecks && ((state & UI.STATE_CHECKED) != 0))
      current = (((state & (UI.STATE_SELECTED | UI.STATE_FOCUSED | UI.STATE_PRESSED)) != 0) ? checkedAltered : checked);
    else
      current = (((state & (UI.STATE_SELECTED | UI.STATE_FOCUSED | UI.STATE_PRESSED)) != 0) ? altered : normal);
    opacity = ((current == null) ? PixelFormat.TRANSPARENT : current.getOpacity());
    return current;
  }
  
  @Override
  public void draw(Canvas canvas) {
    if (current != null)
      current.draw(canvas);
  }
  
  @Override
  public int[] getState() {
    return stateSet;
  }
  
  @Override
  public boolean setState(int[] stateSet) {
    this.stateSet = stateSet;
    int newState = 0;
    if (stateSet != null) {
      for (int i = stateSet.length - 1; i >= 0; i--) {
        switch (stateSet[i]) {
        case android.R.attr.state_selected:
          newState |= UI.STATE_SELECTED;
          break;
        case android.R.attr.state_focused:
          newState |= UI.STATE_FOCUSED;
          break;
        case android.R.attr.state_pressed:
          newState |= UI.STATE_PRESSED;
          break;
        case android.R.attr.state_checked:
          newState |= UI.STATE_CHECKED;
          break;
        }
      }
    }
    if (state == newState)
      return false;
    state = newState;
    computeCurrent();
    invalidateSelf();
    return true;
  }
  
  @Override
  public void setBounds(Rect bounds) {
    super.setBounds(bounds);
    if (normal != null)
      normal.setBounds(bounds);
    if (altered != null)
      altered.setBounds(bounds);
    if (checked != null)
      checked.setBounds(bounds);
    if (checkedAltered != null)
      checkedAltered.setBounds(bounds);
  }
  
  @Override
  public void setBounds(int left, int top, int right, int bottom) {
    super.setBounds(left, top, right, bottom);
    if (normal != null)
      normal.setBounds(left, top, right, bottom);
    if (altered != null)
      altered.setBounds(left, top, right, bottom);
    if (checked != null)
      checked.setBounds(left, top, right, bottom);
    if (checkedAltered != null)
      checkedAltered.setBounds(left, top, right, bottom);
  }
  
  @Override
  public void setAlpha(int alpha) {
    if (this.alpha != alpha) {
      this.alpha = alpha;
      if (normal != null)
        normal.setAlpha(alpha);
      if (altered != null)
        altered.setAlpha(alpha);
      if (checked != null)
        checked.setAlpha(alpha);
      if (checkedAltered != null)
        checkedAltered.setAlpha(alpha);
    }
  }
  
  @Override
  public void setDither(boolean dither) {
    if (this.dither != dither) {
      this.dither = dither;
      if (normal != null)
        normal.setDither(dither);
      if (altered != null)
        altered.setDither(dither);
      if (checked != null)
        checked.setDither(dither);
      if (checkedAltered != null)
        checkedAltered.setDither(dither);
    }
  }
  
  @Override
  public void setColorFilter(ColorFilter cf) {
    if (this.cf != cf) {
      this.cf = cf;
      if (normal != null)
        normal.setColorFilter(cf);
      if (altered != null)
        altered.setColorFilter(cf);
      if (checked != null)
        checked.setColorFilter(cf);
      if (checkedAltered != null)
        checkedAltered.setColorFilter(cf);
    }
  }
  
  @Override
  public void clearColorFilter() {
    if (this.cf != null) {
      this.cf = null;
      if (normal != null)
        normal.clearColorFilter();
      if (altered != null)
        altered.clearColorFilter();
      if (checked != null)
        checked.clearColorFilter();
      if (checkedAltered != null)
        checkedAltered.clearColorFilter();
    }
  }
  
  @Override
  public Drawable getCurrent() {
    return current;
  }
  
  @Override
  public int getIntrinsicHeight() {
    return ((current != null) ? current.getIntrinsicHeight() : 0);
  }
  
  @Override
  public int getIntrinsicWidth() {
    return ((current != null) ? current.getIntrinsicWidth() : 0);
  }
  
  @Override
  public int getMinimumHeight() {
    return ((current != null) ? current.getMinimumHeight() : 0);
  }
  
  @Override
  public int getMinimumWidth() {
    return ((current != null) ? current.getMinimumWidth() : 0);
  }
  
  @Override
  public Region getTransparentRegion() {
    return ((current != null) ? current.getTransparentRegion() : null);
  }
  
   @Override
  public boolean getPadding(Rect padding) {
    return ((current != null) ? current.getPadding(padding) : false);
  }
  
  @Override
  public int getOpacity() {
    return opacity;
  }
  
  @Override
  public Drawable mutate() {
    final StateDrawable t = new StateDrawable((normal == null) ? null : normal.mutate(), (altered == null) ? null : altered.mutate(), (checked == null) ? null : checked.mutate(), (checkedAltered == null) ? null : checkedAltered.mutate(), state, stateSet);
    t.setAlpha(alpha);
    t.setDither(dither);
    t.setColorFilter(cf);
    t.setVisible(isVisible(), true);
    t.setBounds(getBounds());
    return t;
  }
  
  @Override
  public boolean isStateful() {
    return true;
  }
  
  @Override
  public int getAlpha() {
    return alpha;
  }
  
  @TargetApi(Build.VERSION_CODES.KITKAT)
  @Override
  public boolean isAutoMirrored() {
    return ((current == null) ? true : current.isAutoMirrored());
  }
}
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