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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 package org.chromium.ui;
      6 
      7 import android.content.Context;
      8 import android.graphics.drawable.GradientDrawable;
      9 import android.graphics.drawable.GradientDrawable.Orientation;
     10 import android.os.Build;
     11 import android.view.View;
     12 import android.widget.SeekBar;
     13 import android.widget.SeekBar.OnSeekBarChangeListener;
     14 import android.widget.TextView;
     15 
     16 import org.chromium.base.ApiCompatibilityUtils;
     17 
     18 /**
     19  * Encapsulates a single gradient view of the HSV color display, including its label, gradient
     20  * view and seek bar.
     21  *
     22  * Mirrors a "color_picker_advanced_component" layout.
     23  */
     24 public class ColorPickerAdvancedComponent {
     25     // The view that displays the gradient.
     26     private final View mGradientView;
     27     // The seek bar that allows the user to change the value of this component.
     28     private final SeekBar mSeekBar;
     29     // The set of colors to interpolate the gradient through.
     30     private int[] mGradientColors;
     31     // The Drawable that represents the gradient.
     32     private GradientDrawable mGradientDrawable;
     33     // The text label for the component.
     34     private final TextView mText;
     35 
     36     /**
     37      * Initializes the views.
     38      *
     39      * @param rootView View that contains all the content, such as the label, gradient view, etc.
     40      * @param textResourceId The resource ID of the text to show on the label.
     41      * @param seekBarMax The range of the seek bar.
     42      * @param seekBarListener The listener for when the seek bar value changes.
     43      */
     44     ColorPickerAdvancedComponent(final View rootView,
     45             final int textResourceId,
     46             final int seekBarMax,
     47             final OnSeekBarChangeListener seekBarListener) {
     48         mGradientView = rootView.findViewById(R.id.gradient);
     49         mText = (TextView) rootView.findViewById(R.id.text);
     50         mText.setText(textResourceId);
     51         mGradientDrawable = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, null);
     52         mSeekBar = (SeekBar) rootView.findViewById(R.id.seek_bar);
     53         mSeekBar.setOnSeekBarChangeListener(seekBarListener);
     54         mSeekBar.setMax(seekBarMax);
     55         // Setting the thumb offset means the seek bar thumb can move all the way to each end
     56         // of the gradient view.
     57         Context context = rootView.getContext();
     58         int offset = context.getResources()
     59                             .getDrawable(R.drawable.color_picker_advanced_select_handle)
     60                             .getIntrinsicWidth();
     61         mSeekBar.setThumbOffset(offset / 2);
     62     }
     63 
     64     /**
     65      * @return The value represented by this component, maintained by the seek bar progress.
     66      */
     67     public float getValue() {
     68         return mSeekBar.getProgress();
     69     }
     70 
     71     /**
     72      * Sets the value of the component (by setting the seek bar value).
     73      *
     74      * @param newValue The value to give the component.
     75      */
     76     public void setValue(float newValue) {
     77         mSeekBar.setProgress((int) newValue);
     78     }
     79 
     80     /**
     81      * Sets the colors for the gradient view to interpolate through.
     82      *
     83      * @param newColors The set of colors representing the interpolation points for the gradient.
     84      */
     85     public void setGradientColors(int[] newColors) {
     86         mGradientColors = newColors.clone();
     87         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
     88             Orientation currentOrientation = Orientation.LEFT_RIGHT;
     89             mGradientDrawable = new GradientDrawable(currentOrientation, mGradientColors);
     90         } else {
     91             mGradientDrawable.setColors(mGradientColors);
     92         }
     93         ApiCompatibilityUtils.setBackgroundForView(mGradientView, mGradientDrawable);
     94     }
     95 }
     96