fix height of last hour

addresses #163

onDraw: add missing height for checking minimum of mCurrentOrigin.y

scroller.fling: add missing height to minY in so fling can scroll to
full last hour

Author: marunjar

library/src/main/java/com/alamkanak/weekview/WeekView.java

@@ -175,7 +175,7 @@ public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float ve
                 mScroller.fling((int) mCurrentOrigin.x, 0, (int) (velocityX * mXScrollingSpeed), 0, Integer.MIN_VALUE, Integer.MAX_VALUE, 0, 0);
             }
             else if (mCurrentFlingDirection == Direction.VERTICAL){
-                mScroller.fling(0, (int) mCurrentOrigin.y, 0, (int) velocityY, 0, 0, (int) -(mHourHeight * 24 + mHeaderTextHeight + mHeaderRowPadding * 2 - getHeight()), 0);
+                mScroller.fling(0, (int) mCurrentOrigin.y, 0, (int) velocityY, 0, 0, (int) -(mHourHeight * 24 + mHeaderTextHeight + mHeaderRowPadding * 2 + mHeaderMarginBottom + mTimeTextHeight/2 - getHeight()), 0);
             }
 
             ViewCompat.postInvalidateOnAnimation(WeekView.this);
@@ -500,8 +500,8 @@ else if(mNewHourHeight > mMaxHourHeight)
         }
 
         //if the new mCurrentOrigin.y is invalid, make it valid.
-        if (mCurrentOrigin.y < getHeight() - mHourHeight * 24 - mHeaderTextHeight - mHeaderRowPadding * 2 - mHeaderMarginBottom)
-            mCurrentOrigin.y = getHeight() - mHourHeight * 24 - mHeaderTextHeight - mHeaderRowPadding * 2 - mHeaderMarginBottom;
+        if (mCurrentOrigin.y < getHeight() - mHourHeight * 24 - mHeaderTextHeight - mHeaderRowPadding * 2 - mHeaderMarginBottom - mTimeTextHeight/2)
+            mCurrentOrigin.y = getHeight() - mHourHeight * 24 - mHeaderTextHeight - mHeaderRowPadding * 2 - mHeaderMarginBottom - mTimeTextHeight/2;
         //Don't put an else if because it will trigger a glitch when completly zoomed out and scrolling vertically.
         if(mCurrentOrigin.y > 0)
             mCurrentOrigin.y = 0;