1/*
2 * Copyright (C) 2012 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
17package com.android.deskclock;
18
19import android.content.Context;
20import android.graphics.Typeface;
21import android.util.AttributeSet;
22import android.widget.TextView;
23
24/**
25 * Displays text with no padding at the top.
26 */
27public class ZeroTopPaddingTextView extends TextView {
28    private static final float NORMAL_FONT_PADDING_RATIO = 0.328f;
29    // the bold fontface has less empty space on the top
30    private static final float BOLD_FONT_PADDING_RATIO = 0.208f;
31
32    private static final float NORMAL_FONT_BOTTOM_PADDING_RATIO = 0.25f;
33    // the bold fontface has less empty space on the top
34    private static final float BOLD_FONT_BOTTOM_PADDING_RATIO = 0.208f;
35
36    private static final Typeface SAN_SERIF_BOLD = Typeface.create("san-serif", Typeface.BOLD);
37
38    private int mPaddingRight = 0;
39
40    public ZeroTopPaddingTextView(Context context) {
41        this(context, null);
42    }
43
44    public ZeroTopPaddingTextView(Context context, AttributeSet attrs) {
45        this(context, attrs, 0);
46    }
47
48    public ZeroTopPaddingTextView(Context context, AttributeSet attrs, int defStyle) {
49        super(context, attrs, defStyle);
50        setIncludeFontPadding(false);
51        updatePadding();
52    }
53
54    public void updatePadding() {
55        float paddingRatio = NORMAL_FONT_PADDING_RATIO;
56        float bottomPaddingRatio = NORMAL_FONT_BOTTOM_PADDING_RATIO;
57        if (getTypeface().equals(SAN_SERIF_BOLD)) {
58            paddingRatio = BOLD_FONT_PADDING_RATIO;
59            bottomPaddingRatio = BOLD_FONT_BOTTOM_PADDING_RATIO;
60        }
61        // no need to scale by display density because getTextSize() already returns the font
62        // height in px
63        setPadding(0, (int) (-paddingRatio * getTextSize()), mPaddingRight,
64                (int) (-bottomPaddingRatio * getTextSize()));
65    }
66
67    public void setPaddingRight(int padding) {
68        mPaddingRight = padding;
69        updatePadding();
70    }
71}
72