1 /** 2 * Copyright (c) 2011, Google Inc. 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 package com.android.mail; 17 18 import android.app.ProgressDialog; 19 import android.content.Context; 20 import android.content.DialogInterface; 21 import android.content.DialogInterface.OnShowListener; 22 import android.os.Handler; 23 24 /** 25 * MinTimeProgressDialog implements a ProgressDialog that waits MIN_DELAY ms to 26 * be dismissed before showing. Once visible, the dialog will be visible for at 27 * least MIN_SHOW_TIME to avoid "flashes" in the UI when an event could take a 28 * largely variable time to complete (from none, to a user perceivable amount) 29 * 30 * @author mindyp 31 */ 32 public class MinTimeProgressDialog extends ProgressDialog implements OnShowListener { 33 private static int sMinShowTime; 34 35 private static int sMinDelay; 36 37 private int mMinShowTime = -1; 38 39 private long mStartTime = -1; 40 41 private boolean mDismissed = false; 42 43 private final Handler mHandler = new Handler(); 44 45 private final Runnable mDelayedDismiss = new Runnable() { 46 @Override 47 public void run() { 48 MinTimeProgressDialog.super.dismiss(); 49 } 50 }; 51 52 private final Runnable mDelayedShow = new Runnable() { 53 @Override 54 public void run() { 55 if (!mDismissed) { 56 MinTimeProgressDialog.super.show(); 57 } 58 } 59 }; 60 MinTimeProgressDialog(Context context)61 public MinTimeProgressDialog(Context context) { 62 super(context, R.style.MinTimeProgressDialogStyle); 63 sMinShowTime = context.getResources() 64 .getInteger(R.integer.batch_progress_display_time); 65 sMinDelay = context.getResources() 66 .getInteger(R.integer.batch_progress_wait_time); 67 mMinShowTime = sMinShowTime 68 + context.getResources().getInteger(R.integer.dialog_animationDefaultDur); 69 } 70 71 @Override dismiss()72 public void dismiss() { 73 mDismissed = true; 74 long diff = System.currentTimeMillis() - mStartTime; 75 if (diff >= mMinShowTime || mStartTime == -1) { 76 // This covers the case where the dialog was not shown 77 // at all yet OR enough time of the dialog showing 78 // has passed. If it wasn't shown at all yet, then it is 79 // just never shown. 80 super.dismiss(); 81 } else { 82 mHandler.postDelayed(mDelayedDismiss, mMinShowTime - diff); 83 } 84 } 85 86 /** 87 * Dismiss the dialog, immediately if necessary. 88 * 89 * @param force If true, dismiss the dialog right away. 90 */ dismiss(boolean force)91 public void dismiss(boolean force) { 92 if (force) { 93 mDismissed = true; 94 super.dismiss(); 95 } else { 96 dismiss(); 97 } 98 } 99 100 @Override show()101 public void show() { 102 mDismissed = false; 103 mHandler.postDelayed(mDelayedShow, sMinDelay); 104 } 105 106 @Override onShow(DialogInterface dialog)107 public void onShow(DialogInterface dialog) { 108 // When the dialog is actually shown, start the timer. 109 mStartTime = System.currentTimeMillis(); 110 } 111 112 /** 113 * Show a MinTimeProgressDialog. 114 */ show(Context context, CharSequence title, CharSequence message, boolean indeterminate, boolean cancelable, OnCancelListener cancelListener)115 public static MinTimeProgressDialog show(Context context, CharSequence title, 116 CharSequence message, boolean indeterminate, boolean cancelable, 117 OnCancelListener cancelListener) { 118 119 MinTimeProgressDialog dialog = new MinTimeProgressDialog(context); 120 dialog.setTitle(title); 121 dialog.setMessage(message); 122 dialog.setIndeterminate(indeterminate); 123 dialog.setCancelable(cancelable); 124 dialog.setOnCancelListener(cancelListener); 125 dialog.setOnShowListener(dialog); 126 dialog.show(); 127 128 return dialog; 129 } 130 } 131