michael@0: /*
michael@0:  * Copyright (C) 2010 The Android Open Source Project
michael@0:  *
michael@0:  * Licensed under the Apache License, Version 2.0 (the "License");
michael@0:  * you may not use this file except in compliance with the License.
michael@0:  * You may obtain a copy of the License at
michael@0:  *
michael@0:  *      http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing, software
michael@0:  * distributed under the License is distributed on an "AS IS" BASIS,
michael@0:  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
michael@0:  * See the License for the specific language governing permissions and
michael@0:  * limitations under the License.
michael@0:  */
michael@0: 
michael@0: package org.mozilla.gecko.toolbar;
michael@0: 
michael@0: import android.content.Context;
michael@0: import android.graphics.Canvas;
michael@0: import android.graphics.Rect;
michael@0: import android.graphics.drawable.Drawable;
michael@0: import android.os.Build;
michael@0: import android.os.Handler;
michael@0: import android.os.Message;
michael@0: import android.util.AttributeSet;
michael@0: import android.widget.ImageView;
michael@0: import android.view.View;
michael@0: import android.view.animation.Animation;
michael@0: 
michael@0: /**
michael@0:  * Progress view used for page loads.
michael@0:  *
michael@0:  * Because we're given limited information about the page load progress, the
michael@0:  * bar also includes incremental animation between each step to improve
michael@0:  * perceived performance.
michael@0:  */
michael@0: public class ToolbarProgressView extends ImageView {
michael@0:     private static final int MAX_PROGRESS = 10000;
michael@0:     private static final int MSG_UPDATE = 0;
michael@0:     private static final int MSG_HIDE = 1;
michael@0:     private static final int STEPS = 10;
michael@0:     private static final int DELAY = 40;
michael@0: 
michael@0:     private static final boolean PRE_HONEYCOMB = Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB;
michael@0: 
michael@0:     private int mTargetProgress;
michael@0:     private int mIncrement;
michael@0:     private Rect mBounds;
michael@0:     private Handler mHandler;
michael@0:     private int mCurrentProgress;
michael@0: 
michael@0:     public ToolbarProgressView(Context context, AttributeSet attrs, int defStyle) {
michael@0:         super(context, attrs, defStyle);
michael@0:         init(context);
michael@0:     }
michael@0: 
michael@0:     public ToolbarProgressView(Context context, AttributeSet attrs) {
michael@0:         super(context, attrs);
michael@0:         init(context);
michael@0:     }
michael@0: 
michael@0:     public ToolbarProgressView(Context context) {
michael@0:         super(context);
michael@0:         init(context);
michael@0:     }
michael@0: 
michael@0:     private void init(Context ctx) {
michael@0:         mBounds = new Rect(0,0,0,0);
michael@0:         mTargetProgress = 0;
michael@0: 
michael@0:         mHandler = new Handler() {
michael@0:             @Override
michael@0:             public void handleMessage(Message msg) {
michael@0:                 switch (msg.what) {
michael@0:                     case MSG_UPDATE:
michael@0:                         mCurrentProgress = Math.min(mTargetProgress, mCurrentProgress + mIncrement);
michael@0: 
michael@0:                         updateBounds();
michael@0: 
michael@0:                         if (mCurrentProgress < mTargetProgress) {
michael@0:                             final int delay = (mTargetProgress < MAX_PROGRESS) ? DELAY : DELAY / 4;
michael@0:                             sendMessageDelayed(mHandler.obtainMessage(msg.what), delay);
michael@0:                         } else if (mCurrentProgress == MAX_PROGRESS) {
michael@0:                             sendMessageDelayed(mHandler.obtainMessage(MSG_HIDE), DELAY);
michael@0:                         }
michael@0:                         break;
michael@0: 
michael@0:                     case MSG_HIDE:
michael@0:                         setVisibility(View.GONE);
michael@0:                         break;
michael@0:                 }
michael@0:             }
michael@0: 
michael@0:         };
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void setVisibility(int visibility) {
michael@0:         // On GB/Froyo, setting the visibility to GONE/HIDDEN alone does not
michael@0:         // work with translations. Calling clearAnimation acts as a workaround.
michael@0:         if (PRE_HONEYCOMB && visibility != VISIBLE) {
michael@0:             clearAnimation();
michael@0:         }
michael@0: 
michael@0:         super.setVisibility(visibility);
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void setAnimation(Animation animation) {
michael@0:         // On GB/Froyo, setting the animation after hiding the view causes it
michael@0:         // to reappear. As a workaround, disallow setAnimation from being
michael@0:         // called if the view is not shown.
michael@0:         if (PRE_HONEYCOMB && isShown()) {
michael@0:             super.setAnimation(animation);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onLayout(boolean f, int l, int t, int r, int b) {
michael@0:         mBounds.left = 0;
michael@0:         mBounds.right = (r - l) * mCurrentProgress / MAX_PROGRESS;
michael@0:         mBounds.top = 0;
michael@0:         mBounds.bottom = b - t;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void onDraw(Canvas canvas) {
michael@0:         final Drawable d = getDrawable();
michael@0:         d.setBounds(mBounds);
michael@0:         d.draw(canvas);
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Immediately sets the progress bar to the given progress percentage.
michael@0:      *
michael@0:      * @param progress Percentage (0-100) to which progress bar should be set
michael@0:      */
michael@0:     void setProgress(int progressPercentage) {
michael@0:         mCurrentProgress = mTargetProgress = getAbsoluteProgress(progressPercentage);
michael@0:         updateBounds();
michael@0: 
michael@0:         clearMessages();
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Animates the progress bar from the current progress value to the given
michael@0:      * progress percentage.
michael@0:      *
michael@0:      * @param progress Percentage (0-100) to which progress bar should be animated
michael@0:      */
michael@0:     void animateProgress(int progressPercentage) {
michael@0:         final int absoluteProgress = getAbsoluteProgress(progressPercentage);
michael@0:         if (absoluteProgress <= mTargetProgress) {
michael@0:             // After we manually click stop, we can still receive page load
michael@0:             // events (e.g., DOMContentLoaded). Updating for other updates
michael@0:             // after a STOP event can freeze the progress bar, so guard against
michael@0:             // that here.
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         mTargetProgress = absoluteProgress;
michael@0:         mIncrement = (mTargetProgress - mCurrentProgress) / STEPS;
michael@0: 
michael@0:         clearMessages();
michael@0:         mHandler.sendEmptyMessage(MSG_UPDATE);
michael@0:     }
michael@0: 
michael@0:     private void clearMessages() {
michael@0:         mHandler.removeMessages(MSG_UPDATE);
michael@0:         mHandler.removeMessages(MSG_HIDE);
michael@0:     }
michael@0: 
michael@0:     private int getAbsoluteProgress(int progressPercentage) {
michael@0:         if (progressPercentage < 0) {
michael@0:             return 0;
michael@0:         }
michael@0: 
michael@0:         if (progressPercentage > 100) {
michael@0:             return 100;
michael@0:         }
michael@0: 
michael@0:         return progressPercentage * MAX_PROGRESS / 100;
michael@0:     }
michael@0: 
michael@0:     private void updateBounds() {
michael@0:         mBounds.right = getWidth() * mCurrentProgress / MAX_PROGRESS;
michael@0:         invalidate();
michael@0:     }
michael@0: }