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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.camera.ui;
     18 
     19 import android.content.Context;
     20 import android.graphics.Canvas;
     21 import android.graphics.drawable.Drawable;
     22 import android.graphics.drawable.GradientDrawable;
     23 import android.util.AttributeSet;
     24 import android.view.View;
     25 
     26 import com.android.camera2.R;
     27 
     28 /**
     29  * This class encapsulates the logic of drawing different states of the icon in
     30  * mode drawer for when it is highlighted (to indicate the current module), or when
     31  * it is selected by the user. It handles the internal state change like a state
     32  * list drawable. The advantage over a state list drawable is that in the class
     33  * multiple states can be rendered using the same drawable with some color modification,
     34  * whereas a state list drawable would require a different drawable for each state.
     35  */
     36 public class ModeIconView extends View {
     37     private final GradientDrawable mBackground;
     38 
     39     private final int mIconBackgroundSize;
     40     private int mHighlightColor;
     41     private final int mBackgroundDefaultColor;
     42     private final int mIconDrawableSize;
     43     private Drawable mIconDrawable = null;
     44 
     45     public ModeIconView(Context context, AttributeSet attrs) {
     46         super(context, attrs);
     47         mBackgroundDefaultColor = getResources().getColor(R.color.mode_selector_icon_background);
     48         mIconBackgroundSize = getResources().getDimensionPixelSize(
     49                 R.dimen.mode_selector_icon_block_width);
     50         mBackground = (GradientDrawable) getResources()
     51                 .getDrawable(R.drawable.mode_icon_background).mutate();
     52         mBackground.setBounds(0, 0, mIconBackgroundSize, mIconBackgroundSize);
     53         mIconDrawableSize = getResources().getDimensionPixelSize(
     54                 R.dimen.mode_selector_icon_drawable_size);
     55     }
     56 
     57     /**
     58      * Sets the drawable that shows the icon of the mode.
     59      *
     60      * @param drawable drawable of the mode icon
     61      */
     62     public void setIconDrawable(Drawable drawable) {
     63         mIconDrawable = drawable;
     64 
     65         // Center icon in the background.
     66         if (mIconDrawable != null) {
     67             mIconDrawable.setBounds(mIconBackgroundSize / 2 - mIconDrawableSize / 2,
     68                     mIconBackgroundSize / 2 - mIconDrawableSize / 2,
     69                     mIconBackgroundSize / 2 + mIconDrawableSize / 2,
     70                     mIconBackgroundSize / 2 + mIconDrawableSize / 2);
     71             invalidate();
     72         }
     73     }
     74 
     75     @Override
     76     public void draw(Canvas canvas) {
     77         super.draw(canvas);
     78         mBackground.draw(canvas);
     79         if (mIconDrawable != null) {
     80             mIconDrawable.draw(canvas);
     81         }
     82     }
     83 
     84     /**
     85      * @return A clone of the icon drawable associated with this view.
     86      */
     87     public Drawable getIconDrawableClone() {
     88         return mIconDrawable.getConstantState().newDrawable();
     89     }
     90 
     91     /**
     92      * @return The size of the icon drawable.
     93      */
     94     public int getIconDrawableSize() {
     95         return mIconDrawableSize;
     96     }
     97 
     98     /**
     99      * This gets called when the selected state is changed. When selected, the background
    100      * drawable will use a solid pre-defined color to indicate selection.
    101      *
    102      * @param selected true when selected, false otherwise.
    103      */
    104     @Override
    105     public void setSelected(boolean selected) {
    106         if (selected) {
    107             mBackground.setColor(mHighlightColor);
    108         } else {
    109             mBackground.setColor(mBackgroundDefaultColor);
    110         }
    111 
    112         invalidate();
    113     }
    114 
    115     /**
    116      * Sets the color that will be used in the drawable for highlight state.
    117      *
    118      * @param highlightColor color for the highlight state
    119      */
    120     public void setHighlightColor(int highlightColor) {
    121         mHighlightColor = highlightColor;
    122     }
    123 
    124     /**
    125      * @return The highlightColor color the the highlight state.
    126      */
    127     public int getHighlightColor() {
    128         return mHighlightColor;
    129     }
    130 }
    131