# -*- coding: utf-8 -*-
HANDLE_SIZE = 8
import dabo
dabo.ui.loadUI("wx")
import dabo.dEvents as dEvents


class DragHandle(dabo.ui.dPanel):
	""" The class for all the handles used to indicate the selected control
	that are dragged to resize the control. It has properties indicating
	whether it controls resizing the control in the up, right, down or left
	directions. These values are determined from the name of the handle,
	which follows a simple naming convention:
		First character: T, M, B => Top, Middle or Bottom
		Second character: L, M, R = > Left, Middle or Right
	When the contol is dragged, it passes the event up to its parent. The
	parent object then determines the affected control, and passes the
	event on to that control.
	"""
	def __init__(self, parent, handleName):
		sz = (HANDLE_SIZE, HANDLE_SIZE)
		super(DragHandle, self).__init__(parent, Size=sz, Visible=False,
				BackColor="blue")
		self.handleName = handleName

		if self.handleName in ("TL", "BR"):
			cursor = dabo.ui.dUICursors.Cursor_Size_NWSE
		elif self.handleName in ("TR", "BL"):
			cursor = dabo.ui.dUICursors.Cursor_Size_NESW
		elif self.handleName in ("TM", "BM"):
			cursor = dabo.ui.dUICursors.Cursor_Size_NS
		else:
			cursor = dabo.ui.dUICursors.Cursor_Size_WE
		self.MousePointer = dabo.ui.dUICursors.getStockCursor(cursor)
		
		self.selection = None
		
		ud = handleName[0]
		lr = handleName[1]
		self.up = (ud == "T")
		self.down = (ud == "B")
		self.left = (lr == "L")
		self.right = (lr == "R")
		
		self.bindEvent(dEvents.MouseLeftDown, self.onLeftDown)
		self.bindEvent(dEvents.MouseLeftUp, self.onLeftUp)
		self.bindEvent(dEvents.MouseMove, self.onMouseDrag)
		self.dragging = False


	def onLeftDown(self, evt):
		self.dragging = True
		self.Form.startResize(self, evt)
		
	
	def onLeftUp(self, evt):
		self.dragging = False
		self.Form.processLeftUp(self, evt)
		evt.stop()
	
	
	def onMouseDrag(self, evt, shft=None):
		if shft is None:
			try:
				shft = evt.EventData["shiftDown"]
			except AttributeError:
				shft = False
		if self.dragging:
			self.Form.resizeCtrl(self, evt)