Android Open Source - FPlayAndroid Bg Button

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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  a  v a  2  s  . c om
// 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;

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.ViewDebug.ExportedProperty;
import android.view.ViewGroup.LayoutParams;
import android.view.accessibility.AccessibilityEvent;
import android.widget.Button;

import br.com.carlosrafaelgn.fplay.R;
import br.com.carlosrafaelgn.fplay.ui.drawable.TextIconDrawable;

public final class BgButton extends Button {
  public static interface OnPressingChangeListener {
    public void onPressingChanged(BgButton button, boolean pressed);
  }

  private static String selected, unselected;

  private int state;
  private boolean checkable, checked, stretchable, hideBorders, forceDescription;
  private String iconChecked, iconUnchecked;
  private CharSequence descriptionChecked, descriptionUnchecked;
  private TextIconDrawable checkBox;
  private OnPressingChangeListener pressingChangeListener;
  
  public BgButton(Context context) {
    super(context);
    init();
  }
  
  public BgButton(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
  }
  
  public BgButton(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
  }
  
  private void init() {
    super.setBackgroundResource(0);
    super.setDrawingCacheEnabled(false);
    super.setTextColor(UI.colorState_text_reactive);
    super.setTypeface(UI.defaultTypeface);
    super.setTextSize(TypedValue.COMPLEX_UNIT_PX, UI._18sp);
    super.setGravity(Gravity.CENTER);
    super.setPadding(UI._8sp, UI._8sp, UI._8sp, UI._8sp);
    super.setFocusableInTouchMode(false);
    super.setFocusable(true);
    if (selected == null)
      selected = getContext().getText(R.string.selected).toString();
    if (unselected == null)
      unselected = getContext().getText(R.string.unselected).toString();
  }
  
  public void setHideBorders(boolean hideBorders) {
    this.hideBorders = hideBorders;
  }
  
  public void setDefaultHeight() {
    LayoutParams p = getLayoutParams();
    if (p == null)
      p = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    p.height = UI.defaultControlSize;
    super.setLayoutParams(p);
    super.setPadding(UI._8sp, 0, UI._8sp, 0);
  }
  
  public void setIconNoChanges(String icon) {
    super.setTextSize(TypedValue.COMPLEX_UNIT_PX, UI.defaultControlContentsSize);
    super.setTypeface(UI.iconsTypeface);
    super.setText(icon);
    super.setPadding(0, 0, 0, 0);
  }
  
  public void setIcon(String icon, boolean changeWidth, boolean changeHeight) {
    LayoutParams p = getLayoutParams();
    if (p == null)
      p = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    if (changeWidth)
      p.width = UI.defaultControlSize;
    if (changeHeight)
      p.height = UI.defaultControlSize;
    super.setLayoutParams(p);
    setIconNoChanges(icon);
  }
  
  public void setIcon(String icon) {
    setIcon(icon, true, true);
  }
  
  public void setIcon(String iconChecked, String iconUnchecked, boolean checked, boolean small, boolean changeWidth, boolean changeHeight) {
    setIcon(checked ? iconChecked : iconUnchecked, changeWidth, changeHeight);
    if (small)
      super.setTextSize(TypedValue.COMPLEX_UNIT_PX, UI._IconBox);
    this.iconChecked = iconChecked;
    this.iconUnchecked = iconUnchecked;
    this.checkable = true;
    this.checked = checked;
  }
  
  public boolean isBehavingAsCheckBox() {
    return (checkBox != null);
  }
  
  public void setBehavingAsCheckBox(boolean behavingAsCheckBox) {
    if (!behavingAsCheckBox) {
      super.setCompoundDrawables(null, null, null, null);
      checkBox = null;
      checkable = false;
    } else {
      checkable = true;
      checkBox = new TextIconDrawable(checked ? UI.ICON_OPTCHK : UI.ICON_OPTUNCHK, getTextColors().getDefaultColor());
      super.setCompoundDrawables(checkBox, null, null, null);
    }
  }

  @Override
  public CharSequence getContentDescription() {
    if (checkable) {
      if (checked) {
        if (descriptionChecked != null)
          return descriptionChecked;
      } else if (descriptionUnchecked != null) {
        return descriptionUnchecked;
      }
      CharSequence c = super.getContentDescription();
      if (c == null)
        c = getText();
      return c + ": " + (checked ? selected : unselected);
    }
    return super.getContentDescription();
  }

  public void setContentDescription(CharSequence descriptionChecked, CharSequence descriptionUnchecked) {
    this.descriptionChecked = descriptionChecked;
    this.descriptionUnchecked = descriptionUnchecked;
  }

  public OnPressingChangeListener getOnPressingChangeListener() {
    return pressingChangeListener;
  }
  
  public void setOnPressingChangeListener(OnPressingChangeListener pressingChangeListener) {
    this.pressingChangeListener = pressingChangeListener;
  }
  
  private void fixTextSize(int w, int h) {
    if (w <= 0 || h <= 0)
      return;
    w -= (getPaddingLeft() + getPaddingRight());
    h -= (getPaddingTop() + getPaddingBottom());
    super.setTextSize(TypedValue.COMPLEX_UNIT_PX, (w < h) ? w : h);
  }
  
  public boolean isIconStretchable() {
    return stretchable;
  }
  
  public void setIconStretchable(boolean stretchable) {
    this.stretchable = stretchable;
    if (stretchable)
      fixTextSize(getWidth(), getHeight());
  }
  
  public boolean isCheckable() {
    return checkable;
  }
  
  public void setCheckable(boolean checkable) {
    if (!checkable)
      setChecked(false);
    this.checkable = checkable;
  }
  
  public void toggle() {
    setChecked(!checked);
  }
  
  public boolean isChecked() {
    return checked;
  }
  
  public void setChecked(boolean checked) {
    checkable = true;
    if (this.checked != checked) {
      this.checked = checked;
      if (checkBox != null) {
        checkBox.setIcon(checked ? UI.ICON_OPTCHK : UI.ICON_OPTUNCHK);
        invalidate();
      } else {
        super.setText(checked ? iconChecked : iconUnchecked);
      }
    }
  }

  @Override
  public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
    if (forceDescription) {
      forceDescription = false;
      event.setEventType(32768); //AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED = 32768
    }
    return super.dispatchPopulateAccessibilityEvent(event);
  }

  @Override
  public boolean performClick() {
    if (checkable) {
      toggle();
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
        forceDescription = true;
    }
    return super.performClick();
  }
  
  @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
  @Override
  public void setBackground(Drawable background) {
    super.setBackground(null);
  }
  
  @Override
  @Deprecated
  public void setBackgroundDrawable(Drawable background) {
    super.setBackgroundDrawable(null);
  }
  
  @Override
  public void setBackgroundResource(int resid) {
    super.setBackgroundResource(0);
  }
  
  @Override
  public void setBackgroundColor(int color) {
    super.setBackgroundResource(0);
  }
  
  @Override
  public Drawable getBackground() {
    return null;
  }
  
  @Override
  @ExportedProperty(category = "drawing")
  public boolean isOpaque() {
    return false;//(state != 0);
  }
  
  @Override
  protected void drawableStateChanged() {
    super.drawableStateChanged();
    final int old = (state & UI.STATE_PRESSED);
    state = UI.handleStateChanges(state, isPressed(), isFocused(), this);
    if (pressingChangeListener != null && (state & UI.STATE_PRESSED) != old)
      pressingChangeListener.onPressingChanged(this, old == 0);
  }
  
  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    if (stretchable)
      fixTextSize(w, h);
  }
  
  @Override
  protected void onDraw(Canvas canvas) {
    getDrawingRect(UI.rect);
    if (hideBorders)
      UI.drawBgBorderless(canvas, state, false);
    else
      UI.drawBg(canvas, state);
    super.onDraw(canvas);
  }
  
  @Override
  protected void onDetachedFromWindow() {
    iconChecked = null;
    iconUnchecked = null;
    descriptionChecked = null;
    descriptionUnchecked = null;
    checkBox = null;
    pressingChangeListener = null;
    super.setCompoundDrawables(null, null, null, null);
    super.onDetachedFromWindow();
  }
}
Java Source Code List
