The Tor Browser: mobile/android/base/home/FadedTextView.java@fc2d59ddac77

     1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 package org.mozilla.gecko.home;

     8 import android.content.Context;

     9 import android.content.res.TypedArray;

    10 import android.graphics.Canvas;

    11 import android.graphics.LinearGradient;

    12 import android.graphics.Shader;

    13 import android.graphics.drawable.Drawable;

    14 import android.util.AttributeSet;

    15 import android.widget.TextView;

    17 import org.mozilla.gecko.R;

    19 /**

    20  * FadedTextView fades the ends of the text by fadeWidth amount,

    21  * if the text is too long and requires an ellipsis.

    22  */

    23 public class FadedTextView extends TextView {

    25     // Width of the fade effect from end of the view.

    26     private int mFadeWidth;

    28     // Padding for compound drawables.

    29     private int mCompoundPadding;

    31     public FadedTextView(Context context) {

    32         this(context, null);

    33     }

    35     public FadedTextView(Context context, AttributeSet attrs) {

    36         this(context, attrs, android.R.attr.textViewStyle);

    37     }

    39     public FadedTextView(Context context, AttributeSet attrs, int defStyle) {

    40         super(context, attrs, defStyle);

    42         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FadedTextView);

    43         mFadeWidth = a.getDimensionPixelSize(R.styleable.FadedTextView_fadeWidth, 0);

    44         a.recycle();

    46         mCompoundPadding = getCompoundDrawablePadding();

    47     }

    49     /**

    50      * {@inheritDoc}

    51      */

    52     @Override

    53     public void onDraw(Canvas canvas) {

    54         int width = getMeasuredWidth();

    56         // Layout doesn't return a proper width for getWidth().

    57         // Instead check the width of the first line, as we've restricted to just one line.

    58         if (getLayout().getLineWidth(0) > width) {

    59             final Drawable leftDrawable = getCompoundDrawables()[0];

    60             int drawableWidth = 0;

    61             if (leftDrawable != null) {

    62                 drawableWidth = leftDrawable.getIntrinsicWidth() + mCompoundPadding;

    63                 width -= drawableWidth;

    64             }

    66             int color = getCurrentTextColor();

    67             float stop = ((float) (width - mFadeWidth) / (float) width);

    68             LinearGradient gradient = new LinearGradient(0, 0, width, 0,

    69                                                          new int[] { color, color, 0x0 },

    70                                                          new float[] { 0, stop, 1.0f - (drawableWidth / width) },

    71                                                          Shader.TileMode.CLAMP);

    72             getPaint().setShader(gradient);

    73         } else {

    74             getPaint().setShader(null);

    75         }

    77         // Do a default draw.

    78         super.onDraw(canvas);

    79     }

    80 }

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