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/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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.camera.ui;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import org.codeaurora.snapcam.R;
/**
* Renders a circular progress bar on the screen.
*/
public class ProgressRenderer {
public static interface VisibilityListener {
public void onHidden();
}
private final int mProgressRadius;
private final Paint mProgressBasePaint;
private final Paint mProgressPaint;
private RectF mArcBounds = new RectF(0, 0, 1, 1);
private int mProgressAngleDegrees = 270;
private boolean mVisible = false;
private VisibilityListener mVisibilityListener;
/**
* After we reach 100%, keep on painting the progress for another x milliseconds
* before hiding it.
*/
private static final int SHOW_PROGRESS_X_ADDITIONAL_MS = 100;
/** When to hide the progress indicator. */
private long mTimeToHide = 0;
public ProgressRenderer(Context context) {
mProgressRadius = context.getResources().getDimensionPixelSize(R.dimen.pie_progress_radius);
int pieProgressWidth = context.getResources().getDimensionPixelSize(
R.dimen.pie_progress_width);
mProgressBasePaint = createProgressPaint(pieProgressWidth, 0.2f);
mProgressPaint = createProgressPaint(pieProgressWidth, 1.0f);
}
/**
* Sets or replaces a visiblity listener.
*/
public void setVisibilityListener(VisibilityListener listener) {
mVisibilityListener = listener;
}
/**
* Shows a progress indicator. If the progress is '100', the progress
* indicator will be hidden.
*
* @param percent the progress in percent (0-100).
*/
public void setProgress(int percent) {
// Clamp the value.
percent = Math.min(100, Math.max(percent, 0));
mProgressAngleDegrees = (int) ((360f / 100) * percent);
// We hide the progress once we drew the 100% state once.
if (percent < 100) {
mVisible = true;
mTimeToHide = System.currentTimeMillis() + SHOW_PROGRESS_X_ADDITIONAL_MS;
}
}
/**
* Draw the current progress (if < 100%) centered at the given location.
*/
public void onDraw(Canvas canvas, int centerX, int centerY) {
if (!mVisible) {
return;
}
mArcBounds = new RectF(centerX - mProgressRadius, centerY - mProgressRadius, centerX
+ mProgressRadius,
centerY + mProgressRadius);
canvas.drawCircle(centerX, centerY, mProgressRadius, mProgressBasePaint);
canvas.drawArc(mArcBounds, -90, mProgressAngleDegrees, false, mProgressPaint);
// After we reached 100%, we paint the progress renderer for another x
// milliseconds until we hide it.
if (mProgressAngleDegrees == 360 && System.currentTimeMillis() > mTimeToHide) {
mVisible = false;
if (mVisibilityListener != null) {
mVisibilityListener.onHidden();
}
}
}
/**
* @return Whether the progress renderer is visible.
*/
public boolean isVisible() {
return mVisible;
}
private static Paint createProgressPaint(int width, float alpha) {
Paint paint = new Paint();
paint.setAntiAlias(true);
// 20% alpha.
paint.setColor(Color.argb((int) (alpha * 255), 255, 255, 255));
paint.setStrokeWidth(width);
paint.setStyle(Paint.Style.STROKE);
return paint;
}
}
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