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      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 
     17 package com.android.calendar;
     18 
     19 import android.content.Context;
     20 import android.graphics.drawable.Drawable;
     21 import android.util.AttributeSet;
     22 import android.view.View;
     23 import android.view.View.OnClickListener;
     24 import android.widget.ImageButton;
     25 import android.widget.LinearLayout;
     26 import android.widget.TextView;
     27 
     28 public 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