src/com/android/gallery3d/app/TimeBar.java - platform/packages/apps/Gallery2 - Git at Google

 /*
  * Copyright (C) 2011 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.gallery3d.app;

 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.Rect;
 import android.util.DisplayMetrics;
 import android.view.MotionEvent;
 import android.view.View;

 import com.android.gallery3d.R;
 import com.android.gallery3d.common.Utils;

 /**
  * The time bar view, which includes the current and total time, the progress bar,
  * and the scrubber.
  */
 public class TimeBar extends View {

   public interface Listener {
     void onScrubbingStart();
     void onScrubbingMove(int time);
     void onScrubbingEnd(int time);
   }

   // Padding around the scrubber to increase its touch target
   private static final int SCRUBBER_PADDING_IN_DP = 10;

   // The total padding, top plus bottom
   private static final int V_PADDING_IN_DP = 30;

   private static final int TEXT_SIZE_IN_DP = 14;

   private final Listener listener;

   // the bars we use for displaying the progress
   private final Rect progressBar;
   private final Rect playedBar;

   private final Paint progressPaint;
   private final Paint playedPaint;
   private final Paint timeTextPaint;

   private final Bitmap scrubber;
   private final int scrubberPadding; // adds some touch tolerance around the scrubber

   private int scrubberLeft;
   private int scrubberTop;
   private int scrubberCorrection;
   private boolean scrubbing;
   private boolean showTimes;
   private boolean showScrubber;

   private int totalTime;
   private int currentTime;

   private final Rect timeBounds;

   private int vPaddingInPx;

   public TimeBar(Context context, Listener listener) {
     super(context);
     this.listener = Utils.checkNotNull(listener);

     showTimes = true;
     showScrubber = true;

     progressBar = new Rect();
     playedBar = new Rect();

     progressPaint = new Paint();
     progressPaint.setColor(0xFF808080);
     playedPaint = new Paint();
     playedPaint.setColor(0xFFFFFFFF);

     DisplayMetrics metrics = context.getResources().getDisplayMetrics();
     float textSizeInPx = metrics.density * TEXT_SIZE_IN_DP;
     timeTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
     timeTextPaint.setColor(0xFFCECECE);
     timeTextPaint.setTextSize(textSizeInPx);
     timeTextPaint.setTextAlign(Paint.Align.CENTER);

     timeBounds = new Rect();
     timeTextPaint.getTextBounds("0:00:00", 0, 7, timeBounds);

     scrubber = BitmapFactory.decodeResource(getResources(), R.drawable.scrubber_knob);
     scrubberPadding = (int) (metrics.density * SCRUBBER_PADDING_IN_DP);

     vPaddingInPx = (int) (metrics.density * V_PADDING_IN_DP);
   }

   private void update() {
     playedBar.set(progressBar);

     if (totalTime > 0) {
       playedBar.right =
           playedBar.left + (int) ((progressBar.width() * (long) currentTime) / totalTime);
     } else {
       playedBar.right = progressBar.left;
     }

     if (!scrubbing) {
       scrubberLeft = playedBar.right - scrubber.getWidth() / 2;
     }
     invalidate();
   }

   /**
    * @return the preferred height of this view, including invisible padding
    */
   public int getPreferredHeight() {
     return timeBounds.height() + vPaddingInPx + scrubberPadding;
   }

   /**
    * @return the height of the time bar, excluding invisible padding
    */
   public int getBarHeight() {
     return timeBounds.height() + vPaddingInPx;
   }

   public void setTime(int currentTime, int totalTime) {
     if (this.currentTime == currentTime && this.totalTime == totalTime) {
         return;
     }
     this.currentTime = currentTime;
     this.totalTime = totalTime;
     update();
   }

   public void setShowTimes(boolean showTimes) {
     this.showTimes = showTimes;
     requestLayout();
   }

   public void resetTime() {
     setTime(0, 0);
   }

   public void setShowScrubber(boolean showScrubber) {
     this.showScrubber = showScrubber;
     if (!showScrubber && scrubbing) {
       listener.onScrubbingEnd(getScrubberTime());
       scrubbing = false;
     }
     requestLayout();
   }

   private boolean inScrubber(float x, float y) {
     int scrubberRight = scrubberLeft + scrubber.getWidth();
     int scrubberBottom = scrubberTop + scrubber.getHeight();
     return scrubberLeft - scrubberPadding < x && x < scrubberRight + scrubberPadding
         && scrubberTop - scrubberPadding < y && y < scrubberBottom + scrubberPadding;
   }

   private void clampScrubber() {
     int half = scrubber.getWidth() / 2;
     int max = progressBar.right - half;
     int min = progressBar.left - half;
     scrubberLeft = Math.min(max, Math.max(min, scrubberLeft));
   }

   private int getScrubberTime() {
     return (int) ((long) (scrubberLeft + scrubber.getWidth() / 2 - progressBar.left)
         * totalTime / progressBar.width());
   }

   @Override
   protected void onLayout(boolean changed, int l, int t, int r, int b) {
     int w = r - l;
     int h = b - t;
     if (!showTimes && !showScrubber) {
       progressBar.set(0, 0, w, h);
     } else {
       int margin = scrubber.getWidth() / 3;
       if (showTimes) {
         margin += timeBounds.width();
       }
       int progressY = (h + scrubberPadding) / 2;
       scrubberTop = progressY - scrubber.getHeight() / 2 + 1;
       progressBar.set(
           getPaddingLeft() + margin, progressY,
           w - getPaddingRight() - margin, progressY + 4);
     }
     update();
   }

   @Override
   public void draw(Canvas canvas) {
     super.draw(canvas);

     // draw progress bars
     canvas.drawRect(progressBar, progressPaint);
     canvas.drawRect(playedBar, playedPaint);

     // draw scrubber and timers
     if (showScrubber) {
       canvas.drawBitmap(scrubber, scrubberLeft, scrubberTop, null);
     }
     if (showTimes) {
       canvas.drawText(
           stringForTime(currentTime),
           timeBounds.width() / 2 + getPaddingLeft(),
           timeBounds.height() + vPaddingInPx / 2 + scrubberPadding + 1,
           timeTextPaint);
       canvas.drawText(
           stringForTime(totalTime),
           getWidth() - getPaddingRight() - timeBounds.width() / 2,
           timeBounds.height() + vPaddingInPx / 2 + scrubberPadding + 1,
           timeTextPaint);
     }
   }

   @Override
   public boolean onTouchEvent(MotionEvent event) {

     if (showScrubber) {
       int x = (int) event.getX();
       int y = (int) event.getY();

       switch (event.getAction()) {
         case MotionEvent.ACTION_DOWN:
           if (inScrubber(x, y)) {
             scrubbing = true;
             scrubberCorrection = x - scrubberLeft;
             listener.onScrubbingStart();
             return true;
           }
           break;
         case MotionEvent.ACTION_MOVE:
           if (scrubbing) {
             scrubberLeft = x - scrubberCorrection;
             clampScrubber();
             currentTime = getScrubberTime();
             listener.onScrubbingMove(currentTime);
             invalidate();
             return true;
           }
           break;
         case MotionEvent.ACTION_CANCEL:
         case MotionEvent.ACTION_UP:
           if (scrubbing) {
             listener.onScrubbingEnd(getScrubberTime());
             scrubbing = false;
             return true;
           }
           break;
       }
     }
     return false;
   }

   private String stringForTime(long millis) {
     int totalSeconds = (int) millis / 1000;
     int seconds = totalSeconds % 60;
     int minutes = (totalSeconds / 60) % 60;
     int hours = totalSeconds / 3600;
     if (hours > 0) {
       return String.format("%d:%02d:%02d", hours, minutes, seconds).toString();
     } else {
       return String.format("%02d:%02d", minutes, seconds).toString();
     }
   }

 }
	/*
	* Copyright (C) 2011 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.gallery3d.app;

	import android.content.Context;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.graphics.Canvas;
	import android.graphics.Paint;
	import android.graphics.Rect;
	import android.util.DisplayMetrics;
	import android.view.MotionEvent;
	import android.view.View;

	import com.android.gallery3d.R;
	import com.android.gallery3d.common.Utils;

	/**
	* The time bar view, which includes the current and total time, the progress bar,
	* and the scrubber.
	*/
	public class TimeBar extends View {

	public interface Listener {
	void onScrubbingStart();
	void onScrubbingMove(int time);
	void onScrubbingEnd(int time);
	}

	// Padding around the scrubber to increase its touch target
	private static final int SCRUBBER_PADDING_IN_DP = 10;

	// The total padding, top plus bottom
	private static final int V_PADDING_IN_DP = 30;

	private static final int TEXT_SIZE_IN_DP = 14;

	private final Listener listener;

	// the bars we use for displaying the progress
	private final Rect progressBar;
	private final Rect playedBar;

	private final Paint progressPaint;
	private final Paint playedPaint;
	private final Paint timeTextPaint;

	private final Bitmap scrubber;
	private final int scrubberPadding; // adds some touch tolerance around the scrubber

	private int scrubberLeft;
	private int scrubberTop;
	private int scrubberCorrection;
	private boolean scrubbing;
	private boolean showTimes;
	private boolean showScrubber;

	private int totalTime;
	private int currentTime;

	private final Rect timeBounds;

	private int vPaddingInPx;

	public TimeBar(Context context, Listener listener) {
	super(context);
	this.listener = Utils.checkNotNull(listener);

	showTimes = true;
	showScrubber = true;

	progressBar = new Rect();
	playedBar = new Rect();

	progressPaint = new Paint();
	progressPaint.setColor(0xFF808080);
	playedPaint = new Paint();
	playedPaint.setColor(0xFFFFFFFF);

	DisplayMetrics metrics = context.getResources().getDisplayMetrics();
	float textSizeInPx = metrics.density * TEXT_SIZE_IN_DP;
	timeTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
	timeTextPaint.setColor(0xFFCECECE);
	timeTextPaint.setTextSize(textSizeInPx);
	timeTextPaint.setTextAlign(Paint.Align.CENTER);

	timeBounds = new Rect();
	timeTextPaint.getTextBounds("0:00:00", 0, 7, timeBounds);

	scrubber = BitmapFactory.decodeResource(getResources(), R.drawable.scrubber_knob);
	scrubberPadding = (int) (metrics.density * SCRUBBER_PADDING_IN_DP);

	vPaddingInPx = (int) (metrics.density * V_PADDING_IN_DP);
	}

	private void update() {
	playedBar.set(progressBar);

	if (totalTime > 0) {
	playedBar.right =
	playedBar.left + (int) ((progressBar.width() * (long) currentTime) / totalTime);
	} else {
	playedBar.right = progressBar.left;
	}

	if (!scrubbing) {
	scrubberLeft = playedBar.right - scrubber.getWidth() / 2;
	}
	invalidate();
	}

	/**
	* @return the preferred height of this view, including invisible padding
	*/
	public int getPreferredHeight() {
	return timeBounds.height() + vPaddingInPx + scrubberPadding;
	}

	/**
	* @return the height of the time bar, excluding invisible padding
	*/
	public int getBarHeight() {
	return timeBounds.height() + vPaddingInPx;
	}

	public void setTime(int currentTime, int totalTime) {
	if (this.currentTime == currentTime && this.totalTime == totalTime) {
	return;
	}
	this.currentTime = currentTime;
	this.totalTime = totalTime;
	update();
	}

	public void setShowTimes(boolean showTimes) {
	this.showTimes = showTimes;
	requestLayout();
	}

	public void resetTime() {
	setTime(0, 0);
	}

	public void setShowScrubber(boolean showScrubber) {
	this.showScrubber = showScrubber;
	if (!showScrubber && scrubbing) {
	listener.onScrubbingEnd(getScrubberTime());
	scrubbing = false;
	}
	requestLayout();
	}

	private boolean inScrubber(float x, float y) {
	int scrubberRight = scrubberLeft + scrubber.getWidth();
	int scrubberBottom = scrubberTop + scrubber.getHeight();
	return scrubberLeft - scrubberPadding < x && x < scrubberRight + scrubberPadding
	&& scrubberTop - scrubberPadding < y && y < scrubberBottom + scrubberPadding;
	}

	private void clampScrubber() {
	int half = scrubber.getWidth() / 2;
	int max = progressBar.right - half;
	int min = progressBar.left - half;
	scrubberLeft = Math.min(max, Math.max(min, scrubberLeft));
	}

	private int getScrubberTime() {
	return (int) ((long) (scrubberLeft + scrubber.getWidth() / 2 - progressBar.left)
	* totalTime / progressBar.width());
	}

	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
	int w = r - l;
	int h = b - t;
	if (!showTimes && !showScrubber) {
	progressBar.set(0, 0, w, h);
	} else {
	int margin = scrubber.getWidth() / 3;
	if (showTimes) {
	margin += timeBounds.width();
	}
	int progressY = (h + scrubberPadding) / 2;
	scrubberTop = progressY - scrubber.getHeight() / 2 + 1;
	progressBar.set(
	getPaddingLeft() + margin, progressY,
	w - getPaddingRight() - margin, progressY + 4);
	}
	update();
	}

	@Override
	public void draw(Canvas canvas) {
	super.draw(canvas);

	// draw progress bars
	canvas.drawRect(progressBar, progressPaint);
	canvas.drawRect(playedBar, playedPaint);

	// draw scrubber and timers
	if (showScrubber) {
	canvas.drawBitmap(scrubber, scrubberLeft, scrubberTop, null);
	}
	if (showTimes) {
	canvas.drawText(
	stringForTime(currentTime),
	timeBounds.width() / 2 + getPaddingLeft(),
	timeBounds.height() + vPaddingInPx / 2 + scrubberPadding + 1,
	timeTextPaint);
	canvas.drawText(
	stringForTime(totalTime),
	getWidth() - getPaddingRight() - timeBounds.width() / 2,
	timeBounds.height() + vPaddingInPx / 2 + scrubberPadding + 1,
	timeTextPaint);
	}
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {

	if (showScrubber) {
	int x = (int) event.getX();
	int y = (int) event.getY();

	switch (event.getAction()) {
	case MotionEvent.ACTION_DOWN:
	if (inScrubber(x, y)) {
	scrubbing = true;
	scrubberCorrection = x - scrubberLeft;
	listener.onScrubbingStart();
	return true;
	}
	break;
	case MotionEvent.ACTION_MOVE:
	if (scrubbing) {
	scrubberLeft = x - scrubberCorrection;
	clampScrubber();
	currentTime = getScrubberTime();
	listener.onScrubbingMove(currentTime);
	invalidate();
	return true;
	}
	break;
	case MotionEvent.ACTION_CANCEL:
	case MotionEvent.ACTION_UP:
	if (scrubbing) {
	listener.onScrubbingEnd(getScrubberTime());
	scrubbing = false;
	return true;
	}
	break;
	}
	}
	return false;
	}

	private String stringForTime(long millis) {
	int totalSeconds = (int) millis / 1000;
	int seconds = totalSeconds % 60;
	int minutes = (totalSeconds / 60) % 60;
	int hours = totalSeconds / 3600;
	if (hours > 0) {
	return String.format("%d:%02d:%02d", hours, minutes, seconds).toString();
	} else {
	return String.format("%02d:%02d", minutes, seconds).toString();
	}
	}

	}