michael@0: /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.home;
michael@0: 
michael@0: import android.content.Context;
michael@0: import android.content.res.TypedArray;
michael@0: import android.graphics.Canvas;
michael@0: import android.graphics.LinearGradient;
michael@0: import android.graphics.Shader;
michael@0: import android.graphics.drawable.Drawable;
michael@0: import android.util.AttributeSet;
michael@0: import android.widget.TextView;
michael@0: 
michael@0: import org.mozilla.gecko.R;
michael@0: 
michael@0: /**
michael@0:  * FadedTextView fades the ends of the text by fadeWidth amount,
michael@0:  * if the text is too long and requires an ellipsis.
michael@0:  */
michael@0: public class FadedTextView extends TextView {
michael@0: 
michael@0:     // Width of the fade effect from end of the view.
michael@0:     private int mFadeWidth;
michael@0: 
michael@0:     // Padding for compound drawables.
michael@0:     private int mCompoundPadding;
michael@0: 
michael@0:     public FadedTextView(Context context) {
michael@0:         this(context, null);
michael@0:     }
michael@0: 
michael@0:     public FadedTextView(Context context, AttributeSet attrs) {
michael@0:         this(context, attrs, android.R.attr.textViewStyle);
michael@0:     }
michael@0: 
michael@0:     public FadedTextView(Context context, AttributeSet attrs, int defStyle) {
michael@0:         super(context, attrs, defStyle);
michael@0: 
michael@0:         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FadedTextView);
michael@0:         mFadeWidth = a.getDimensionPixelSize(R.styleable.FadedTextView_fadeWidth, 0);
michael@0:         a.recycle();
michael@0: 
michael@0:         mCompoundPadding = getCompoundDrawablePadding();
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * {@inheritDoc}
michael@0:      */
michael@0:     @Override
michael@0:     public void onDraw(Canvas canvas) {
michael@0:         int width = getMeasuredWidth();
michael@0: 
michael@0:         // Layout doesn't return a proper width for getWidth().
michael@0:         // Instead check the width of the first line, as we've restricted to just one line.
michael@0:         if (getLayout().getLineWidth(0) > width) {
michael@0:             final Drawable leftDrawable = getCompoundDrawables()[0];
michael@0:             int drawableWidth = 0;
michael@0:             if (leftDrawable != null) {
michael@0:                 drawableWidth = leftDrawable.getIntrinsicWidth() + mCompoundPadding;
michael@0:                 width -= drawableWidth;
michael@0:             }
michael@0: 
michael@0:             int color = getCurrentTextColor();
michael@0:             float stop = ((float) (width - mFadeWidth) / (float) width);
michael@0:             LinearGradient gradient = new LinearGradient(0, 0, width, 0,
michael@0:                                                          new int[] { color, color, 0x0 },
michael@0:                                                          new float[] { 0, stop, 1.0f - (drawableWidth / width) },
michael@0:                                                          Shader.TileMode.CLAMP);
michael@0:             getPaint().setShader(gradient);
michael@0:         } else {
michael@0:             getPaint().setShader(null);
michael@0:         }
michael@0: 
michael@0:         // Do a default draw.
michael@0:         super.onDraw(canvas);
michael@0:     }
michael@0: }