From 81b41090d9538992c125fec37069ba961fc15bec Mon Sep 17 00:00:00 2001
From: Su Liu <suliu@codeaurora.org>
Date: Wed, 4 Sep 2013 18:16:50 +0800
Subject: Camera: Change volume hard key button to zoom function

Able to capture image through volume hard key
button in camera application, change the function
to zoom function.

Change-Id: Iab9fc2492b2e2ff89cd58c21bac2f147f47b77e2
---
 src/com/android/camera/ui/ZoomRenderer.java | 36 +++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'src/com/android/camera/ui')

diff --git a/src/com/android/camera/ui/ZoomRenderer.java b/src/com/android/camera/ui/ZoomRenderer.java
index 9943b1c8d..be4996b41 100644
--- a/src/com/android/camera/ui/ZoomRenderer.java
+++ b/src/com/android/camera/ui/ZoomRenderer.java
@@ -49,6 +49,7 @@ public class ZoomRenderer extends OverlayRenderer
     private int mZoomFraction;
     private Rect mTextBounds;
     private int mOrientation;
+    private Canvas mCanvas;
 
     public interface OnZoomChangedListener {
         void onZoomStart();
@@ -110,6 +111,7 @@ public class ZoomRenderer extends OverlayRenderer
 
     @Override
     public void onDraw(Canvas canvas) {
+        mCanvas = canvas;
         canvas.rotate(mOrientation, mCenterX, mCenterY);
         mPaint.setStrokeWidth(mInnerStroke);
         canvas.drawCircle(mCenterX, mCenterY, mMinCircle, mPaint);
@@ -125,6 +127,13 @@ public class ZoomRenderer extends OverlayRenderer
                 mTextPaint);
     }
 
+     public void onScaleChangeDraw(Canvas canvas) {
+        if(mCanvas != null){
+            onDraw(mCanvas);
+        }
+    }
+
+
     @Override
     public boolean onScale(ScaleGestureDetector detector) {
         final float sf = detector.getScaleFactor();
@@ -139,6 +148,33 @@ public class ZoomRenderer extends OverlayRenderer
         return true;
     }
 
+    public boolean onScaleStepResize(boolean direction) {
+        int zoom;
+        float circle;
+        float circleStep = (mMaxCircle - mMinCircle)/10;
+        if(direction){
+            circle = (int) (mCircleSize + circleStep);
+        } else {
+            circle = (int) (mCircleSize - circleStep);
+        }
+        circle = Math.max(mMinCircle, circle);
+        circle = Math.min(mMaxCircle, circle);
+        if (mListener != null && (int) circle != mCircleSize
+            && ((mMaxCircle - mMinCircle) != 0)) {
+            mCircleSize = (int) circle;
+            zoom = mMinZoom + (int) ((mCircleSize - mMinCircle)
+                   * (mMaxZoom - mMinZoom) / (mMaxCircle - mMinCircle));
+            if (mListener != null) {
+                mListener.onZoomStart();
+                mListener.onZoomValueChanged(zoom);
+                mListener.onZoomEnd();
+            }
+            return true;
+        } else {
+            return false;
+        }
+    }
+
     @Override
     public boolean onScaleBegin(ScaleGestureDetector detector) {
         setVisible(true);
-- 
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