1/*
2 * Copyright (C) 2011 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.calendar;
18
19import android.content.Context;
20import android.graphics.drawable.Drawable;
21import android.util.AttributeSet;
22import android.view.View;
23import android.view.View.OnClickListener;
24import android.widget.ImageButton;
25import android.widget.LinearLayout;
26import android.widget.TextView;
27
28public class ExpandableTextView extends LinearLayout implements OnClickListener {
29
30    TextView mTv;
31    ImageButton mButton; // Button to expand/collapse
32
33    private boolean mRelayout = false;
34    private boolean mCollapsed = true; // Show short version as default.
35    private int mMaxCollapsedLines = 8; // The default number of lines;
36    private Drawable mExpandDrawable;
37    private Drawable mCollapseDrawable;
38
39    public ExpandableTextView(Context context) {
40        super(context);
41        init();
42    }
43
44    public ExpandableTextView(Context context, AttributeSet attrs) {
45        super(context, attrs, 0);
46        init();
47    }
48
49    public ExpandableTextView(Context context, AttributeSet attrs, int defStyle) {
50        super(context, attrs, defStyle);
51        init();
52    }
53
54    void init() {
55        mMaxCollapsedLines = getResources().getInteger((R.integer.event_info_desc_line_num));
56        mExpandDrawable = getResources().getDrawable(R.drawable.ic_expand_small_holo_light);
57        mCollapseDrawable = getResources().getDrawable(R.drawable.ic_collapse_small_holo_light);
58    }
59
60    @Override
61    public void onClick(View v) {
62        if (mButton.getVisibility() != View.VISIBLE) {
63            return;
64        }
65
66        mCollapsed = !mCollapsed;
67        mButton.setImageDrawable(mCollapsed ? mExpandDrawable : mCollapseDrawable);
68        mTv.setMaxLines(mCollapsed ? mMaxCollapsedLines : Integer.MAX_VALUE);
69    }
70
71    @Override
72    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
73        // If no change, measure and return
74        if (!mRelayout || getVisibility() == View.GONE) {
75            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
76            return;
77        }
78        mRelayout = false;
79
80        // Setup with optimistic case
81        // i.e. Everything fits. No button needed
82        mButton.setVisibility(View.GONE);
83        mTv.setMaxLines(Integer.MAX_VALUE);
84
85        // Measure
86        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
87
88        // If the text fits in collapsed mode, we are done.
89        if (mTv.getLineCount() <= mMaxCollapsedLines) {
90            return;
91        }
92
93        // Doesn't fit in collapsed mode. Collapse text view as needed. Show
94        // button.
95        if (mCollapsed) {
96            mTv.setMaxLines(mMaxCollapsedLines);
97        }
98        mButton.setVisibility(View.VISIBLE);
99
100        // Re-measure with new setup
101        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
102    }
103
104    private void findViews() {
105        mTv = (TextView) findViewById(R.id.expandable_text);
106        mTv.setOnClickListener(this);
107        mButton = (ImageButton) findViewById(R.id.expand_collapse);
108        mButton.setOnClickListener(this);
109    }
110
111    public void setText(String text) {
112        mRelayout = true;
113        if (mTv == null) {
114            findViews();
115        }
116        String trimmedText = text.trim();
117        mTv.setText(trimmedText);
118        this.setVisibility(trimmedText.length() == 0 ? View.GONE : View.VISIBLE);
119    }
120
121    public CharSequence getText() {
122        if (mTv == null) {
123            return "";
124        }
125        return mTv.getText();
126    }
127}
128