Class: Tgios::UITableViewUtilityBinding

Inherits:
BindingBase show all
Defined in:
lib/tgios/ui_table_view_utility_binding.rb

Overview

common usage: call listen_to_keyboard in viewWillAppear call stop_listen_to_keyboard in viewWillDisappear call will_scroll_to_index_path in text field begin_edit event

Instance Method Summary collapse

Methods inherited from BindingBase

#dealloc, #hook, #initialize, #prepareForRelease, #unhook

Constructor Details

This class inherits a constructor from Tgios::BindingBase

Instance Method Details

#bind(table) ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 7

def bind(table)
  @table = WeakRef.new(table)
  self
end

#expand_table_view(note) ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 31

def expand_table_view(note)
  @expanding = true
  offset_y = @table.contentOffset.y
  frame_height = @table.frame.size.height
  content_height = @table.contentSize.height
  new_offset_height = nil
  if frame_height > content_height
    if offset_y != 0
      new_offset_height = 0
    end
  else
    bottom_offset = frame_height - content_height + offset_y
    if bottom_offset > 0
      new_offset_height = offset_y - bottom_offset
    end
  end

  if new_offset_height.nil?
    reset_content_inset_bottom
  else
    curve = note[UIKeyboardAnimationCurveUserInfoKey]
    duration = note[UIKeyboardAnimationDurationUserInfoKey]
    @animation_proc = -> {
      @table.setContentOffset([0, new_offset_height])
    }
    @completion_proc = lambda { |finished|
      reset_content_inset_bottom
    }
    UIView.animateWithDuration(duration-0.01, delay: 0, options: curve,
                               animations: @animation_proc,
                               completion: @completion_proc)
  end
end

#keyboardWillHide(note) ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 27

def keyboardWillHide(note)
  expand_table_view(note)
end

#keyboardWillShow(note) ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 23

def keyboardWillShow(note)
  shrink_table_view(note)
end

#listen_to_keyboard ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 12

def listen_to_keyboard
  @scroll_when_editing = true
  NSNotificationCenter.defaultCenter.addObserver(self, selector: 'keyboardWillShow:', name: UIKeyboardWillShowNotification, object: nil)
  NSNotificationCenter.defaultCenter.addObserver(self, selector: 'keyboardWillHide:', name: UIKeyboardWillHideNotification, object: nil)
end

#onPrepareForRelease ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 114

def onPrepareForRelease
  self.stop_listen_to_keyboard
  @animation_proc=nil
  @completion_proc=nil
  @table=nil
end

#reset_content_inset_bottom ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 78

def reset_content_inset_bottom
  return unless @table.weakref_alive?
  @table.contentInset = UIEdgeInsetsZero
  @table.scrollIndicatorInsets = UIEdgeInsetsZero
  @expanding = false
  if @shrink_height
    set_content_inset_bottom(@shrink_height)
    @shrink_height = nil
  end
end

#scroll_to_index_path(index_path) ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 109

def scroll_to_index_path(index_path)
  @table.scrollToRowAtIndexPath(index_path, atScrollPosition: UITableViewScrollPositionMiddle, animated: true)
  @index_path_to_scroll = nil
end

#set_content_inset_bottom(height) ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 89

def set_content_inset_bottom(height)
  @table.contentInset = UIEdgeInsetsMake(0,0,height,0)
  @table.scrollIndicatorInsets = UIEdgeInsetsMake(0,0,height,0)
  @shrinking = false
  if @index_path_to_scroll
    scroll_to_index_path(@index_path_to_scroll)
    @index_path_to_scroll = nil
  end
end

#shrink_table_view(note) ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 65

def shrink_table_view(note)
  @shrinking = true
  rect = note[UIKeyboardFrameEndUserInfoKey].CGRectValue
  table_rect= @table.superview.convertRect(@table.frame, toView:nil)
  intersect = CGRectIntersection(rect, table_rect)
  expand_height = intersect.present? ? intersect.size.height : 0
  if @expanding
    @shrink_height = expand_height
  else
    set_content_inset_bottom(expand_height)
  end
end

#stop_listen_to_keyboard ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 18

def stop_listen_to_keyboard
  @scroll_when_editing = false
  NSNotificationCenter.defaultCenter.removeObserver(self)
end

#will_scroll_to_index_path(index_path) ⇒ Object 



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# File 'lib/tgios/ui_table_view_utility_binding.rb', line 99

def will_scroll_to_index_path(index_path)
  if @scroll_when_editing
    if @shrinking
      @index_path_to_scroll = index_path
    else
      performSelector('scroll_to_index_path:', withObject: index_path, afterDelay:0.01)
    end
  end
end