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/**
* Copyright (c) 2011, Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.mail;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ProgressBar;
/**
* MinTimeProgressView implements a ProgressBar that waits MIN_DELAY ms to be
* dismissed before showing. Once visible, the progress bar will be visible for
* at least MIN_SHOW_TIME to avoid "flashes" in the UI when an event could take
* a largely variable time to complete (from none, to a user perceivable amount)
*
* @author mindyp
*/
public class MinTimeProgressView extends ProgressBar {
private static int sMinShowTime;
private static int sMinDelay;
private long mStartTime = -1;
private final Handler mHandler = new Handler();
private boolean mDismissed = false;
public MinTimeProgressView(Context context) {
this(context, null);
}
public MinTimeProgressView(Context context, AttributeSet attrs) {
super(context, attrs, R.style.MinTimeProgressViewStyle);
sMinShowTime = context.getResources()
.getInteger(R.integer.html_conv_progress_display_time);
sMinDelay = context.getResources()
.getInteger(R.integer.html_conv_progress_wait_time);
}
private final Runnable mDelayedHide = new Runnable() {
@Override
public void run() {
MinTimeProgressView.super.setVisibility(View.GONE);
}
};
private final Runnable mDelayedShow = new Runnable() {
@Override
public void run() {
if (!mDismissed) {
mStartTime = System.currentTimeMillis();
MinTimeProgressView.super.setVisibility(View.VISIBLE);
}
}
};
private void hide() {
mDismissed = true;
long diff = System.currentTimeMillis() - mStartTime;
if (diff >= sMinShowTime || mStartTime == -1) {
// The progress spinner has been shown long enough
// OR was not shown yet. If it wasn't shown yet,
// it will just never be shown.
MinTimeProgressView.super.setVisibility(View.GONE);
} else {
// The progress spinner is shown, but not long enough,
// so put a delayed message in to hide it when its been
// shown long enough.
mHandler.postDelayed(mDelayedHide, sMinShowTime - diff);
}
}
private void show() {
// Reset the start time.
mStartTime = -1;
mHandler.postDelayed(mDelayedShow, sMinDelay);
}
@Override
public void setVisibility(int visibility) {
// Whenever the visibility gets changed, clear dismissed
// state.
mDismissed = false;
switch (visibility) {
case View.VISIBLE:
show();
break;
case View.GONE:
hide();
break;
default:
super.setVisibility(visibility);
}
}
}
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