private void DrawScale(Canvas canvas)
{
canvas.Save(SaveFlags.Matrix);
// On canvas, North is 0 degrees, East is 90 degrees, South is 180 etc.
// We start the scale somewhere South-West so we need to first rotate the canvas.
canvas.Rotate(mScaleRotation, 0.5f, 0.5f);
int totalTicks = mDivisions * mSubdivisions + 1;
for (int i = 0; i < totalTicks; i++)
{
float y1 = mScaleRect.Top;
float y2 = y1 + 0.015f; // height of division
float y3 = y1 + 0.045f; // height of subdivision
float value = GetValueForTick(i);
Paint paint = GetRangePaint(value);
float mod = value % mDivisionValue;
if ((Math.Abs(mod - 0) < 0.001) || (Math.Abs(mod - mDivisionValue) < 0.001))
{
// Draw a division tick
canvas.DrawLine(0.5f, y1, 0.5f, y3, paint);
// Draw the text 0.15 away from the division tick
DrawTextOnCanvasWithMagnifier(canvas, ValueString(value), 0.5f, y3 + 0.045f, paint);
}
else
{
// Draw a subdivision tick
canvas.DrawLine(0.5f, y1, 0.5f, y2, paint);
}
canvas.Rotate(mSubdivisionAngle, 0.5f, 0.5f);
}
canvas.Restore();
}
private void ComputeCurrentValue()
{
if (!(Math.Abs(mCurrentValue - mTargetValue) > 0.01f))
{
return;
}
if (-1 != mNeedleLastMoved)
{
float time = (JavaSystem.CurrentTimeMillis() - mNeedleLastMoved) / 1000.0f;
float direction = Math.Signum(mNeedleVelocity);
if (Math.Abs(mNeedleVelocity) < 90.0f)
{
mNeedleAcceleration = 5.0f * (mTargetValue - mCurrentValue);
}
else
{
mNeedleAcceleration = 0.0f;
}
mNeedleAcceleration = 5.0f * (mTargetValue - mCurrentValue);
mCurrentValue += mNeedleVelocity * time;
mNeedleVelocity += mNeedleAcceleration * time;
if ((mTargetValue - mCurrentValue) * direction < 0.01f * direction)
{
mCurrentValue = mTargetValue;
mNeedleVelocity = 0.0f;
mNeedleAcceleration = 0.0f;
mNeedleLastMoved = -1L;
}
else
{
mNeedleLastMoved = JavaSystem.CurrentTimeMillis();
}
Invalidate();
}
else
{
mNeedleLastMoved = JavaSystem.CurrentTimeMillis();
ComputeCurrentValue();
}
}
public override bool OnTouchEvent(MotionEvent ev)
{
if (mIsVerbose)
{
Log.Verbose(TAG, "onTouchEvent: " + ((int)ev.Action & MotionEventCompat.ActionMask));
}
if (mVelocityTracker == null)
{
mVelocityTracker = VelocityTracker.Obtain();
}
mVelocityTracker.AddMovement(ev);
var action = ev.Action;
switch ((int)action & MotionEventCompat.ActionMask)
{
case (int)MotionEventActions.Down:
// If being flinged and user touches, stop the fling. isFinished
// will be false if being flinged.
if (!mScroller.IsFinished)
{
mScroller.AbortAnimation();
}
// Remember where the motion event started
mDownMotionX = ev.GetX();
mDownMotionY = ev.GetY();
mDownScrollX = ScrollX;
mActivePointerId = MotionEventCompat.GetPointerId(ev, 0);
break;
case (int)MotionEventActions.Move:
if (mIsVerbose)
{
Log.Verbose(TAG, "mTouchState=" + mTouchState);
}
if (mTouchState == TOUCH_STATE_SCROLLING)
{
// Scroll to follow the motion event
int pointerIndex = MotionEventCompat.FindPointerIndex(ev, mActivePointerId);
float x = MotionEventCompat.GetX(ev, pointerIndex);
View lastChild = GetChildAt(ChildCount - 1);
int maxScrollX = lastChild.Right - Width;
ScrollTo(Math.Max(0, Math.Min(maxScrollX,
(int)(mDownScrollX + mDownMotionX - x
))), 0);
if (mOnScrollListener != null)
{
mOnScrollListener.OnScroll(GetCurrentScreenFraction());
}
}
else if (mTouchState == TOUCH_STATE_REST)
{
if (mLocked)
{
// we're locked on the current screen, don't allow moving
break;
}
/*
* Locally do absolute value. mLastMotionX is set to the y value
* of the down event.
*/
int pointerIndex = MotionEventCompat.FindPointerIndex(ev, mActivePointerId);
float x = MotionEventCompat.GetX(ev, pointerIndex);
float y = MotionEventCompat.GetY(ev, pointerIndex);
int xDiff = (int)Math.Abs(x - mDownMotionX);
int yDiff = (int)Math.Abs(y - mDownMotionY);
bool xPaged = xDiff > mPagingTouchSlop;
bool xMoved = xDiff > mTouchSlop;
bool yMoved = yDiff > mTouchSlop;
if (xMoved || yMoved)
{
if (xPaged)
{
// Scroll if the user moved far enough along the X axis
mTouchState = TOUCH_STATE_SCROLLING;
}
// Either way, cancel any pending longpress
if (mAllowLongPress)
{
mAllowLongPress = false;
// Try canceling the long press. It could also have been scheduled
// by a distant descendant, so use the mAllowLongPress flag to block
// everything
View currentScreen = GetScreenAt(mCurrentScreen);
if (currentScreen != null)
{
currentScreen.CancelLongPress();
}
}
}
}
break;
case (int)MotionEventActions.Up:
if (mTouchState == TOUCH_STATE_SCROLLING)
{
int activePointerId = mActivePointerId;
int pointerIndex = MotionEventCompat.FindPointerIndex(ev, activePointerId);
float x = MotionEventCompat.GetX(ev, pointerIndex);
VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.ComputeCurrentVelocity(1000, mMaximumVelocity);
//TODO(minsdk8): int velocityX = (int) MotionEventUtils.getXVelocity(velocityTracker, activePointerId);
int velocityX = (int)velocityTracker.XVelocity;
bool isFling = Math.Abs(mDownMotionX - x) > MIN_LENGTH_FOR_FLING;
float scrolledPos = GetCurrentScreenFraction();
int whichScreen = Math.Round(scrolledPos);
if (isFling && mIsVerbose)
{
Log.Verbose(TAG, "isFling, whichScreen=" + whichScreen
+ " scrolledPos=" + scrolledPos
+ " mCurrentScreen=" + mCurrentScreen
+ " velocityX=" + velocityX);
}
if (isFling && velocityX > SNAP_VELOCITY && mCurrentScreen > 0)
{
// Fling hard enough to move left
// Don't fling across more than one screen at a time.
int bound = scrolledPos <= whichScreen ?
mCurrentScreen - 1 : mCurrentScreen;
SnapToScreen(Math.Min(whichScreen, bound));
}
else if (isFling && velocityX < -SNAP_VELOCITY &&
mCurrentScreen < ChildCount - 1)
{
// Fling hard enough to move right
// Don't fling across more than one screen at a time.
int bound = scrolledPos >= whichScreen ?
mCurrentScreen + 1 : mCurrentScreen;
SnapToScreen(Math.Max(whichScreen, bound));
}
else
{
SnapToDestination();
}
}
else
{
PerformClick();
}
mTouchState = TOUCH_STATE_REST;
mActivePointerId = INVALID_POINTER;
// Can't do this -> // Intentially fall through to cancel
mTouchState = TOUCH_STATE_REST;
mActivePointerId = INVALID_POINTER;
if (mVelocityTracker != null)
{
mVelocityTracker.Recycle();
mVelocityTracker = null;
}
break;
case (int)MotionEventActions.Cancel:
mTouchState = TOUCH_STATE_REST;
mActivePointerId = INVALID_POINTER;
if (mVelocityTracker != null)
{
mVelocityTracker.Recycle();
mVelocityTracker = null;
}
break;
case (int)MotionEventCompat.ActionPointerUp:
OnSecondaryPointerUp(ev);
break;
}
return(true);
}
public bool OnTouch(View view, MotionEvent motionEvent)
{
if (view != LastTouchedView)
{
Count = 0;
LastTouchedView = view;
}
if (motionEvent.Action == MotionEventActions.Up)
{
Count = 0;
return(true);
}
if (Count < 2)
{
if (Count == 0)
{
HasCloned = false;
FirstX = motionEvent.GetX();
FirstY = motionEvent.GetY();
}
Count++;
return(true);
}
float dX = Math.Abs(motionEvent.GetX() - FirstX);
float dY = Math.Abs(motionEvent.GetY() - FirstY);
if (LastTouchedView.Parent is RecyclerView && (dX > dY) ||
LastTouchedView.Parent is LinearLayout && dY > dX)
{
return(false);
}
if (view is RecyclerBlockView recyclerBlockView)
{
if (!HasCloned)
{
// OnTouchListener is set in DragAction.OnDrop, and OnDragListener doesn't need to be set on the BlockView, as it's set in the ctor of ContainerBlockView !
LastClonedRbv = recyclerBlockView.Clone();
HasCloned = true;
}
view = LastClonedRbv;
}
SaveViewPosition(view);
ClipData clipData = new ClipData("dragged",
new[] { ClipDescription.MimetypeTextPlain },
new ClipData.Item("dragged"));
if (view.StartDragAndDrop(clipData, new View.DragShadowBuilder(LastTouchedView), view, 0))
{
view.Visibility = ViewStates.Invisible;
}
else
{
if (LastTouchedView is RecyclerBlockView blockView)
{
blockView.RemoveCloneInstance();
}
}
return(true);
}
