From 64f0218e6ba484548bd616359255e78956a1484a Mon Sep 17 00:00:00 2001
From: Michal Horn <hornmich@fel.cvut.cz>
Date: Tue, 17 Feb 2015 11:27:37 +0100
Subject: [PATCH] Implement PDF viewer state switching

---
 .../qrscanner/pdfviewer/PdfViewActivity.java  | 64 ++++++++++++++-----
 .../glass/src/main/res/values/strings.xml     |  3 +
 2 files changed, 50 insertions(+), 17 deletions(-)

diff --git a/QRScanner/glass/src/main/java/cz/cvut/fel/dce/qrscanner/pdfviewer/PdfViewActivity.java b/QRScanner/glass/src/main/java/cz/cvut/fel/dce/qrscanner/pdfviewer/PdfViewActivity.java
index 3da70ad..28122eb 100644
--- a/QRScanner/glass/src/main/java/cz/cvut/fel/dce/qrscanner/pdfviewer/PdfViewActivity.java
+++ b/QRScanner/glass/src/main/java/cz/cvut/fel/dce/qrscanner/pdfviewer/PdfViewActivity.java
@@ -7,9 +7,11 @@ import android.hardware.Sensor;
 import android.hardware.SensorEvent;
 import android.hardware.SensorEventListener;
 import android.hardware.SensorManager;
+import android.media.AudioManager;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.util.Log;
+import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.MotionEvent;
@@ -21,6 +23,8 @@ import android.widget.RelativeLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.google.android.glass.media.Sounds;
+
 import java.io.File;
 
 import cz.cvut.fel.dce.qrscanner.R;
@@ -149,7 +153,7 @@ public class PdfViewActivity extends Activity implements ViewTreeObserver.OnGlob
 			Log.i(TAG, "Path to component files: " + picturePath);
 			mPdfView = new PdfPageView(getApplicationContext(), picturePath);
 			mCurrentPageNumber.setText(Integer.toString(mPdfView.getActualPage()+1));
-			mLastPageNumber.setText(Integer.toString(mPdfView.getLastPage()+1));
+			mLastPageNumber.setText(Integer.toString(mPdfView.getLastPage() + 1));
 			mPdfView.setListener(this);
 			mPdfView.setPage(0);
 			new LoadPageTask().execute();
@@ -171,24 +175,47 @@ public class PdfViewActivity extends Activity implements ViewTreeObserver.OnGlob
 
 	@Override
 	public boolean onGenericMotionEvent(MotionEvent event) {
-		/*
-	  Zoom ratio gained during one gesture on touchpad
-	 */
-		float dzoom;
-		if (event.getAction() == MotionEvent.ACTION_DOWN) {
-			startX = event.getRawX();
-			return false;
-		}
-		if (event.getAction() == MotionEvent.ACTION_MOVE) {
-			dzoom = event.getRawX() - startX;
-			Log.d(TAG,"move_action, dzoom: " + dzoom);
-			zoomPage(dzoom /1000f);
-			startX = event.getRawX();
-			return false;
+		if (mViewStates == ViewStates.SCROLLING) {
+			/*
+			  Zoom ratio gained during one gesture on touchpad
+			*/
+			float dzoom;
+			if (event.getAction() == MotionEvent.ACTION_DOWN) {
+				startX = event.getRawX();
+				return false;
+			}
+			if (event.getAction() == MotionEvent.ACTION_MOVE) {
+				dzoom = event.getRawX() - startX;
+				zoomPage(dzoom / 1000f);
+				startX = event.getRawX();
+				return false;
+			}
 		}
 		return super.onGenericMotionEvent(event);
 	}
 
+	@Override
+	public boolean onKeyDown(int keyCode, KeyEvent event) {
+		if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
+			AudioManager audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
+			audio.playSoundEffect(Sounds.TAP);
+			switchState();
+		}
+		return super.onKeyDown(keyCode, event);
+	}
+
+	private void switchState() {
+		if (mViewStates == ViewStates.SCROLLING) {
+			mViewStates = ViewStates.VIEWING;
+			mViewerStateText.setText(getText(R.string.state_viewing));
+		}
+		else {
+			mViewStates = ViewStates.SCROLLING;
+			mViewerStateText.setText(getText(R.string.state_scrolling));
+
+		}
+	}
+
 	@Override
 	public void onAccuracyChanged(Sensor sensor, int accuracy) {
 
@@ -200,7 +227,9 @@ public class PdfViewActivity extends Activity implements ViewTreeObserver.OnGlob
 			float dx = event.values[1]*12;
 			float dy = event.values[0]*12;
 			if (mPdfView != null) {
-				mPdfView.move(-dx, -dy);
+				if (mViewStates == ViewStates.SCROLLING) {
+					mPdfView.move(-dx, -dy);
+				}
 			}
 		}
 	}
@@ -219,7 +248,7 @@ public class PdfViewActivity extends Activity implements ViewTreeObserver.OnGlob
 
 	private void zoomPage(float deltaZoom) {
 		mPdfView.zoom(deltaZoom);
-		mZoomValue.setText(Integer.toString(Math.round(mPdfView.getZoomRatio()*100)));
+		mZoomValue.setText(Integer.toString(Math.round(mPdfView.getZoomRatio() * 100)));
 	}
 
 	private class LoadPageTask extends AsyncTask<Void, Void, Void> {
@@ -241,6 +270,7 @@ public class PdfViewActivity extends Activity implements ViewTreeObserver.OnGlob
 		protected void onPostExecute(Void aVoid) {
 			super.onPostExecute(aVoid);
 			mProgressContainer.setVisibility(View.INVISIBLE);
+			switchState();
 			mPdfImageContainer.addView(mPdfView);
 			zoomPage(0.0f); // just for update the zoom value indicator
 			Log.d(TAG, "PDF page loaded.");
diff --git a/QRScanner/glass/src/main/res/values/strings.xml b/QRScanner/glass/src/main/res/values/strings.xml
index 2d98db1..9b586c2 100644
--- a/QRScanner/glass/src/main/res/values/strings.xml
+++ b/QRScanner/glass/src/main/res/values/strings.xml
@@ -37,4 +37,7 @@ limitations under the License.
     <string name="loading_page">Loading...</string>
     <string name="zoom_label">Zoom:</string>
     <string name="tap_to_start_scan">Tap to start scanning</string>
+    <string name="state_viewing" type="id">viewing</string>
+    <string name="state_scrolling" type="id">scrolling</string>
+
 </resources>
-- 
2.39.2