public override void OnChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, bool isCurrentlyActive)
{
if (actionState == ItemTouchHelper.ActionStateSwipe)
{
viewHolder.ItemView.TranslationX = dX;
if (isCurrentlyActive)
{
MainActivity.instance.contentRefresh.Enabled = false;
}
else
{
MainActivity.instance.contentRefresh.Enabled = true;
}
ColorDrawable background = new ColorDrawable(Color.Red);
if (dX < 0)
{
background.SetBounds(viewHolder.ItemView.Right + (int)dX, viewHolder.ItemView.Top, viewHolder.ItemView.Right, viewHolder.ItemView.Bottom);
drawable.SetBounds(viewHolder.ItemView.Right - MainActivity.instance.DpToPx(52), viewHolder.ItemView.Top + (viewHolder.ItemView.Bottom - viewHolder.ItemView.Top - MainActivity.instance.DpToPx(36)) / 2, viewHolder.ItemView.Right - MainActivity.instance.DpToPx(16), viewHolder.ItemView.Top + (viewHolder.ItemView.Bottom - viewHolder.ItemView.Top + MainActivity.instance.DpToPx(36)) / 2);
}
else
{
background.SetBounds(viewHolder.ItemView.Left, viewHolder.ItemView.Top, viewHolder.ItemView.Left + (int)dX, viewHolder.ItemView.Bottom);
drawable.SetBounds(viewHolder.ItemView.Left + MainActivity.instance.DpToPx(16), viewHolder.ItemView.Top + (viewHolder.ItemView.Bottom - viewHolder.ItemView.Top - MainActivity.instance.DpToPx(36)) / 2, viewHolder.ItemView.Left + MainActivity.instance.DpToPx(52), viewHolder.ItemView.Top + (viewHolder.ItemView.Bottom - viewHolder.ItemView.Top + MainActivity.instance.DpToPx(36)) / 2);
}
background.Draw(c);
drawable.Draw(c);
}
else
{
base.OnChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
}
public override void OnChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, bool isCurrentlyActive)
{
base.OnChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
var itemView = viewHolder.ItemView;
var offset = 20;
if (dX < 0)
{
_background.SetBounds(itemView.Right + ((int)dX - offset), itemView.Top, itemView.Right, itemView.Bottom);
var margin = (itemView.Height - _icon.IntrinsicHeight) / 2;
var top = itemView.Top + (itemView.Height - _icon.IntrinsicHeight) / 2;
var bottom = top + _icon.IntrinsicHeight;
var left = itemView.Right - margin - _icon.IntrinsicWidth;
var right = itemView.Right - margin;
_icon.SetBounds(left, top, right, bottom);
}
else
{
_background.SetBounds(0, 0, 0, 0);
}
_background.Draw(c);
_icon.Draw(c);
}
public override void OnChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, bool isCurrentlyActive)
{
try
{
if (actionState == ItemTouchHelper.ActionStateSwipe)
{
View itemView = viewHolder.ItemView;
Drawable background = new ColorDrawable();
((ColorDrawable)background).Color = GetBgColorCode();
if (dX > 0)
{
// swipe right
background.SetBounds(itemView.Left, itemView.Top, (int)dX, itemView.Bottom);
}
else
{ // swipe left
background.SetBounds(itemView.Right + (int)dX, itemView.Top, itemView.Right, itemView.Bottom);
}
background.Draw(c);
}
base.OnChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
public override void OnChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, bool isCurrentlyActive)
{
base.OnChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
View itemView = viewHolder.ItemView;
int itemHeight = itemView.Height;
Boolean isCancelled = dX == 0 && !isCurrentlyActive;
if (isCancelled)
{
clearCanvas(c, itemView.Right + dX, (float)itemView.Top, (float)itemView.Right, (float)itemView.Bottom);
base.OnChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
return;
}
mBackground.SetColorFilter(Color.Red, PorterDuff.Mode.Add);
mBackground.SetBounds(itemView.Right + (int)dX, itemView.Top, itemView.Right, itemView.Bottom);
mBackground.Draw(c);
int deleteIconTop = itemView.Top + (itemHeight - intrinsicHeight) / 2;
int deleteIconMargin = (itemHeight - intrinsicHeight) / 2;
int deleteIconLeft = itemView.Right - deleteIconMargin - intrinsicWidth;
int deleteIconRight = itemView.Right - deleteIconMargin;
int deleteIconBottom = deleteIconTop + intrinsicHeight;
deleteDrawable.SetBounds(deleteIconLeft, deleteIconTop, deleteIconRight, deleteIconBottom);
deleteDrawable.Draw(c);
base.OnChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
public override void OnChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState,
bool isCurrentlyActive)
{
base.OnChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
var itemView = viewHolder.ItemView;
var itemHeight = itemView.Bottom - itemView.Top;
// Draw the green edit background
var background = new ColorDrawable {
Color = Color.ParseColor("#4CAF50")
};
background.SetBounds(itemView.Left, itemView.Top, itemView.Left + (int)dX, itemView.Bottom);
background.Draw(c);
var context = Mvx.IoCProvider.Resolve <IMvxAndroidCurrentTopActivity>().Activity;
var editIcon = ContextCompat.GetDrawable(context, Resource.Drawable.baseline_edit_white_24);
// Calculate position of edit icon
var iconTop = itemView.Top + (itemHeight - editIcon.IntrinsicHeight) / 2;
var iconMargin = (itemHeight + editIcon.IntrinsicHeight) / 2;
var iconLeft = itemView.Left + iconMargin - editIcon.IntrinsicWidth;
var iconRight = itemView.Left + iconMargin;
var iconBottom = iconTop + editIcon.IntrinsicHeight;
// Draw the edit icon
editIcon.SetBounds(iconLeft, iconTop, iconRight, iconBottom);
editIcon.Draw(c);
}
private void DrawBackground(Canvas c, RectF rect)
{
using (var colorDrawable = new ColorDrawable(BackgroundColor))
{
colorDrawable.SetBounds((int)rect.Left, (int)rect.Top, (int)rect.Right, (int)rect.Bottom);
colorDrawable.Draw(c);
}
}
/**
* Decorate the RecyclerView item with the chosen backgrounds and icons
*/
public void Decorate()
{
try
{
if (_actionState != ItemTouchHelper.ActionStateSwipe)
{
return;
}
if (_dX > 0)
{
// Swiping Right
if (_swipeRightBackgroundColor != null)
{
var background = new ColorDrawable(_swipeRightBackgroundColor.Value);
background.SetBounds(_viewHolder.ItemView.Left, _viewHolder.ItemView.Top,
_viewHolder.ItemView.Left + (int)_dX, _viewHolder.ItemView.Bottom);
background.Draw(_canvas);
}
var iconSize = 0;
if (_swipeRightActionIconId != 0 && _dX > _iconHorizontalMargin)
{
var icon = ContextCompat.GetDrawable(_recyclerView.Context, _swipeRightActionIconId);
if (icon != null)
{
iconSize = icon.IntrinsicHeight;
var halfIcon = iconSize / 2;
var top = _viewHolder.ItemView.Top +
((_viewHolder.ItemView.Bottom - _viewHolder.ItemView.Top) / 2 - halfIcon);
icon.SetBounds(_viewHolder.ItemView.Left + _iconHorizontalMargin, top,
_viewHolder.ItemView.Left + _iconHorizontalMargin + icon.IntrinsicWidth,
top + icon.IntrinsicHeight);
if (_swipeRightActionIconTint != null)
{
icon.SetColorFilter(_swipeRightActionIconTint.Value, PorterDuff.Mode.SrcIn);
}
icon.Draw(_canvas);
}
}
if (!string.IsNullOrEmpty(_mSwipeRightText) && _dX > _iconHorizontalMargin + iconSize)
{
var textPaint = new TextPaint
{
AntiAlias = true,
TextSize = TypedValue.ApplyDimension(_mSwipeRightTextUnit, _mSwipeRightTextSize,
_recyclerView.Context.Resources.DisplayMetrics),
Color = _mSwipeRightTextColor
};
textPaint.SetTypeface(_mSwipeRightTypeface);
var textTop = (int)(_viewHolder.ItemView.Top +
(_viewHolder.ItemView.Bottom - _viewHolder.ItemView.Top) / 2.0 +
textPaint.TextSize / 2);
_canvas.DrawText(_mSwipeRightText,
_viewHolder.ItemView.Left + _iconHorizontalMargin + iconSize +
(iconSize > 0 ? _iconHorizontalMargin / 2 : 0), textTop, textPaint);
}
}
else if (_dX < 0)
{
// Swiping Left
if (_swipeLeftBackgroundColor != null)
{
var background = new ColorDrawable(_swipeLeftBackgroundColor.Value);
background.SetBounds(_viewHolder.ItemView.Right + (int)_dX, _viewHolder.ItemView.Top,
_viewHolder.ItemView.Right, _viewHolder.ItemView.Bottom);
background.Draw(_canvas);
}
var iconSize = 0;
var imgLeft = _viewHolder.ItemView.Right;
if (_swipeLeftActionIconId != 0 && _dX < -_iconHorizontalMargin)
{
var icon = ContextCompat.GetDrawable(_recyclerView.Context, _swipeLeftActionIconId);
if (icon != null)
{
iconSize = icon.IntrinsicHeight;
var halfIcon = iconSize / 2;
var top = _viewHolder.ItemView.Top +
((_viewHolder.ItemView.Bottom - _viewHolder.ItemView.Top) / 2 - halfIcon);
imgLeft = _viewHolder.ItemView.Right - _iconHorizontalMargin - halfIcon * 2;
icon.SetBounds(imgLeft, top, _viewHolder.ItemView.Right - _iconHorizontalMargin,
top + icon.IntrinsicHeight);
if (_swipeLeftActionIconTint != null)
{
icon.SetColorFilter(_swipeLeftActionIconTint.Value, PorterDuff.Mode.SrcIn);
}
icon.Draw(_canvas);
}
}
if (!string.IsNullOrEmpty(_mSwipeLeftText) && _dX < -_iconHorizontalMargin - iconSize)
{
var textPaint = new TextPaint
{
AntiAlias = true,
TextSize = TypedValue.ApplyDimension(_mSwipeLeftTextUnit, _mSwipeLeftTextSize,
_recyclerView.Context.Resources.DisplayMetrics),
Color = _mSwipeLeftTextColor
};
textPaint.SetTypeface(_mSwipeLeftTypeface);
var width = textPaint.MeasureText(_mSwipeLeftText);
var textTop = (int)(_viewHolder.ItemView.Top +
(_viewHolder.ItemView.Bottom - _viewHolder.ItemView.Top) / 2.0 +
textPaint.TextSize / 2);
_canvas.DrawText(_mSwipeLeftText,
imgLeft - width - (imgLeft == _viewHolder.ItemView.Right
? _iconHorizontalMargin
: _iconHorizontalMargin / 2), textTop, textPaint);
}
}
}
catch (Exception e)
{
}
}
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state)
{
var orientation = 0;
int headerCount = 0, footerCount = 0, dataCount;
var adapterObj = parent.GetAdapter();
var adapterType = adapterObj.GetType();
if (adapterType.IsAssignableFrom(typeof(RecyclerArrayAdapter <>)))
{
headerCount = (int)adapterType.GetMethod("GetHeaderCount").Invoke(adapterObj, null);
footerCount = (int)adapterType.GetMethod("GetFooterCount").Invoke(adapterObj, null);
dataCount = (int)adapterType.GetMethod("GetCount").Invoke(adapterObj, null);
}
else
{
dataCount = parent.GetAdapter().ItemCount;
}
var dataStartPosition = headerCount;
var dataEndPosition = headerCount + dataCount;
var layoutManager = parent.GetLayoutManager();
switch (layoutManager)
{
case StaggeredGridLayoutManager manager:
orientation = manager.Orientation;
break;
case GridLayoutManager gridLayoutManager:
orientation = gridLayoutManager.Orientation;
break;
case LinearLayoutManager linearLayoutManager:
orientation = linearLayoutManager.Orientation;
break;
}
int start, end;
if (orientation == OrientationHelper.Vertical)
{
start = parent.PaddingLeft + _paddingLeft;
end = parent.Width - parent.PaddingRight - _paddingRight;
}
else
{
start = parent.PaddingTop + _paddingLeft;
end = parent.Height - parent.PaddingBottom - _paddingRight;
}
var childCount = parent.ChildCount;
for (var i = 0; i < childCount; i++)
{
var child = parent.GetChildAt(i);
var position = parent.GetChildAdapterPosition(child);
if ((position < dataStartPosition || position >= dataEndPosition - 1) &&
(position != dataEndPosition - 1 || !_drawLastItem) &&
(position >= dataStartPosition && position < dataEndPosition || !_drawHeaderFooter))
{
continue;
}
if (orientation == OrientationHelper.Vertical)
{
var layoutParams = (RecyclerView.LayoutParams)child.LayoutParameters;
var top = child.Bottom + layoutParams.BottomMargin;
var bottom = top + _height;
_colorDrawable.SetBounds(start, top, end, bottom);
_colorDrawable.Draw(c);
}
else
{
var layoutParams = (RecyclerView.LayoutParams)child.LayoutParameters;
var left = child.Right + layoutParams.RightMargin;
var right = left + _height;
_colorDrawable.SetBounds(left, start, right, end);
_colorDrawable.Draw(c);
}
}
}
public override void OnChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, bool isCurrentlyActive)
{
if (actionState == ItemTouchHelper.ActionStateSwipe)
{
// Fade out the view as it is swiped out of the parent's bounds
//float alpha = AlphaFull - Math.Abs(dX) / (float)viewHolder.ItemView.Width;
//viewHolder.ItemView.Alpha = alpha;
//viewHolder.ItemView.TranslationX = dX;
//SetTouchListener(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
else
{
}
//if (CurrentViewHolder != null && CurrentViewHolder.GetHashCode() != viewHolder.GetHashCode())
//{
// ClearView(recyclerView, CurrentViewHolder);
// CurrentViewHolder = null;
//}
CurrentViewHolder = viewHolder;
View itemView = viewHolder.ItemView;
int backgroundCornerOffset = 20; //so background is behind the rounded corners of itemView
//int iconHeight = _leftToRightIcon.IntrinsicHeight;
//int iconWidth = _leftToRightIcon.IntrinsicWidth;
int iconHeight = Dp2px(36);
int iconWidth = Dp2px(36);
//235px
int iconMargin = (itemView.Height - iconHeight) / 2;
int iconTop = itemView.Top + (itemView.Height - iconHeight) / 2;
int iconBottom = iconTop + iconHeight;
float newDx = dX;
bool swypingToTheRight = dX > 0;
int maxWidth = (int)(Math.Abs(viewHolder.ItemView.Width * 0.7) * (swypingToTheRight ? 1 : -1));
//System.Diagnostics.Debug.WriteLine("Dx = {0} y maxWidth = {1}", dX, maxWidth);
//System.Diagnostics.Debug.WriteLine("ItemLeft = {0}, ItemTop = {1}, ItemRight = {2}, ItemBottom = {3}", itemView.Left, itemView.Top, itemView.Right, itemView.Bottom);
//DrawButtons(c, viewHolder);
if (swypingToTheRight)
{
_swypeIsHappening = true;
int iconLeft = itemView.Left + iconMargin;
int iconRight = iconLeft + iconWidth;
//_leftButton.Top = itemView.Top;
//_leftButton.Bottom = itemView.Bottom;
//_leftButton.Left = iconLeft;
//_leftButton.Right = iconRight;
//System.Diagnostics.Debug.WriteLine("Swyping to the right. Icon Left = {0}, icon right = {1}, iconTop = {2}, iconBottom = {3}", iconLeft, iconRight, iconTop, iconBottom);
_leftToRightBackground.SetBounds(
itemView.Left,
itemView.Top,
itemView.Left + ((int)dX) + backgroundCornerOffset,
itemView.Bottom);
_leftToRightBackground.Draw(c);
//_leftToRightIcon.Draw(c);
for (int i = 0; i < 1; i++)
{
iconLeft = (int)(itemView.Left + (i + 1) * iconMargin);
iconRight = iconLeft + iconWidth;
_leftToRightIcon.SetBounds(iconLeft, iconTop, iconRight, iconBottom);
_leftToRightIcon.Draw(c);
}
//_leftToRightIcon.Draw(c);
//_leftButton.Draw(c);
}
else if (dX < 0) // Swiping to the left
{
_swypeIsHappening = true;
int iconLeft = itemView.Right - iconMargin - iconWidth;
int iconRight = itemView.Right - iconMargin;
//System.Diagnostics.Debug.WriteLine("Swyping to the left. Icon Left = {0}, icon right = {1}, iconTop = {2}, iconBottom = {3}", iconLeft, iconRight, iconTop, iconBottom);
_rightToLefIcon.SetBounds(iconLeft, iconTop, iconRight, iconBottom);
_rightToLeftbackground.SetBounds(
itemView.Right + ((int)dX) - backgroundCornerOffset,
itemView.Top,
itemView.Right,
itemView.Bottom);
_rightToLeftbackground.Draw(c);
_rightToLefIcon.Draw(c);
}
else
{ // view is unSwiped
_leftToRightBackground.SetBounds(0, 0, 0, 0);
_rightToLeftbackground.SetBounds(0, 0, 0, 0);
_swypeIsHappening = false;
}
//if (newDx != 0 && (swypingToTheRight && newDx >= maxWidth || !swypingToTheRight && newDx < maxWidth))
//{
// _reachedMaxSwypeWidth = true;
// newDx = maxWidth;
// //itemView.TranslationX = maxWidth;
// return;
//}
//else
//{
// _reachedMaxSwypeWidth = false;
//}
base.OnChildDraw(c, recyclerView, viewHolder, newDx, dY, actionState, isCurrentlyActive);
//System.Diagnostics.Debug.WriteLine("-----------OnChildDraw was called");
}
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state)
{
int orientation = 0;
int headerCount = 0, footerCount = 0, dataCount;
var adapterObj = parent.GetAdapter();
var adapterType = adapterObj.GetType();
if (adapterType.IsAssignableFrom(typeof(RecyclerArrayAdapter <>)))
{
headerCount = (int)adapterType.GetMethod("GetHeaderCount").Invoke(adapterObj, null);
footerCount = (int)adapterType.GetMethod("GetFooterCount").Invoke(adapterObj, null);
dataCount = (int)adapterType.GetMethod("GetCount").Invoke(adapterObj, null);
}
else
{
dataCount = parent.GetAdapter().ItemCount;
}
int dataStartPosition = headerCount;
int dataEndPosition = headerCount + dataCount;
RecyclerView.LayoutManager layoutManager = parent.GetLayoutManager();
if (layoutManager is StaggeredGridLayoutManager)
{
orientation = ((StaggeredGridLayoutManager)layoutManager).Orientation;
}
else if (layoutManager is GridLayoutManager)
{
orientation = ((GridLayoutManager)layoutManager).Orientation;
}
else if (layoutManager is LinearLayoutManager)
{
orientation = ((LinearLayoutManager)layoutManager).Orientation;
}
int start, end;
if (orientation == OrientationHelper.Vertical)
{
start = parent.PaddingLeft + mPaddingLeft;
end = parent.Width - parent.PaddingRight - mPaddingRight;
}
else
{
start = parent.PaddingTop + mPaddingLeft;
end = parent.Height - parent.PaddingBottom - mPaddingRight;
}
int childCount = parent.ChildCount;
for (int i = 0; i < childCount; i++)
{
View child = parent.GetChildAt(i);
int position = parent.GetChildAdapterPosition(child);
if (position >= dataStartPosition && position < dataEndPosition - 1 ||//数据项除了最后一项
(position == dataEndPosition - 1 && mDrawLastItem) || //数据项最后一项
(!(position >= dataStartPosition && position < dataEndPosition) && mDrawHeaderFooter) //header&footer且可绘制
)
{
if (orientation == OrientationHelper.Vertical)
{
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams)child.LayoutParameters;
int top = child.Bottom + layoutParams.BottomMargin;
int bottom = top + mHeight;
mColorDrawable.SetBounds(start, top, end, bottom);
mColorDrawable.Draw(c);
}
else
{
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams)child.LayoutParameters;
int left = child.Right + layoutParams.RightMargin;
int right = left + mHeight;
mColorDrawable.SetBounds(left, start, right, end);
mColorDrawable.Draw(c);
}
}
}
}