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# -*- coding: utf-8 -*-
#----------------------------------------------------------------------------
# Name: canvas.py
# Purpose: The canvas class
#
# Author: Pierre Hjälm (from C++ original by Julian Smart)
#
# Created: 2004-05-08
# RCS-ID: $Id$
# Copyright: (c) 2004 Pierre Hjälm - 1998 Julian Smart
# Licence: wxWindows license
#----------------------------------------------------------------------------
import wx
from _lines import LineShape
from _composit import *
NoDragging, StartDraggingLeft, ContinueDraggingLeft, StartDraggingRight, ContinueDraggingRight = 0, 1, 2, 3, 4
KEY_SHIFT, KEY_CTRL = 1, 2
# Helper function: True if 'contains' wholly contains 'contained'.
def WhollyContains(contains, contained):
xp1, yp1 = contains.GetX(), contains.GetY()
xp2, yp2 = contained.GetX(), contained.GetY()
w1, h1 = contains.GetBoundingBoxMax()
w2, h2 = contained.GetBoundingBoxMax()
left1 = xp1 - w1 / 2.0
top1 = yp1 - h1 / 2.0
right1 = xp1 + w1 / 2.0
bottom1 = yp1 + h1 / 2.0
left2 = xp2 - w2 / 2.0
top2 = yp2 - h2 / 2.0
right2 = xp2 + w2 / 2.0
bottom2 = yp2 + h2 / 2.0
return ((left1 <= left2) and (top1 <= top2) and (right1 >= right2) and (bottom1 >= bottom2))
class ShapeCanvas(wx.ScrolledWindow):
def __init__(self, parent = None, id = -1, pos = wx.DefaultPosition, size = wx.DefaultSize, style = wx.BORDER, name = "ShapeCanvas"):
wx.ScrolledWindow.__init__(self, parent, id, pos, size, style, name)
self._shapeDiagram = None
self._dragState = NoDragging
self._draggedShape = None
self._oldDragX = 0
self._oldDragY = 0
self._firstDragX = 0
self._firstDragY = 0
self._checkTolerance = True
wx.EVT_PAINT(self, self.OnPaint)
wx.EVT_MOUSE_EVENTS(self, self.OnMouseEvent)
def SetDiagram(self, diag):
self._shapeDiagram = diag
def GetDiagram(self):
return self._shapeDiagram
def OnPaint(self, evt):
dc = wx.PaintDC(self)
self.PrepareDC(dc)
dc.SetBackground(wx.Brush(self.GetBackgroundColour(), wx.SOLID))
dc.Clear()
if self.GetDiagram():
self.GetDiagram().Redraw(dc)
def OnMouseEvent(self, evt):
dc = wx.ClientDC(self)
self.PrepareDC(dc)
x, y = evt.GetLogicalPosition(dc)
keys = 0
if evt.ShiftDown():
keys |= KEY_SHIFT
if evt.ControlDown():
keys |= KEY_CTRL
dragging = evt.Dragging()
# Check if we're within the tolerance for mouse movements.
# If we're very close to the position we started dragging
# from, this may not be an intentional drag at all.
if dragging:
if self._checkTolerance:
# the difference between two logical coordinates is a logical coordinate
dx = abs(x - self._firstDragX)
dy = abs(y - self._firstDragY)
toler = self.GetDiagram().GetMouseTolerance()
if (dx <= toler) and (dy <= toler):
return
# If we've ignored the tolerance once, then ALWAYS ignore
# tolerance in this drag, even if we come back within
# the tolerance range.
self._checkTolerance = False
# Dragging - note that the effect of dragging is left entirely up
# to the object, so no movement is done unless explicitly done by
# object.
if dragging and self._draggedShape and self._dragState == StartDraggingLeft:
self._dragState = ContinueDraggingLeft
# If the object isn't m_draggable, transfer message to canvas
if self._draggedShape.Draggable():
self._draggedShape.GetEventHandler().OnBeginDragLeft(x, y, keys, self._draggedAttachment)
else:
self._draggedShape = None
self.OnBeginDragLeft(x, y, keys)
self._oldDragX, self._oldDragY = x, y
elif dragging and self._draggedShape and self._dragState == ContinueDraggingLeft:
# Continue dragging
self._draggedShape.GetEventHandler().OnDragLeft(False, self._oldDragX, self._oldDragY, keys, self._draggedAttachment)
self._draggedShape.GetEventHandler().OnDragLeft(True, x, y, keys, self._draggedAttachment)
self._oldDragX, self._oldDragY = x, y
elif evt.LeftUp() and self._draggedShape and self._dragState == ContinueDraggingLeft:
self._dragState = NoDragging
self._checkTolerance = True
self._draggedShape.GetEventHandler().OnDragLeft(False, self._oldDragX, self._oldDragY, keys, self._draggedAttachment)
self._draggedShape.GetEventHandler().OnEndDragLeft(x, y, keys, self._draggedAttachment)
self._draggedShape = None
elif dragging and self._draggedShape and self._dragState == StartDraggingRight:
self._dragState = ContinueDraggingRight
if self._draggedShape.Draggable:
self._draggedShape.GetEventHandler().OnBeginDragRight(x, y, keys, self._draggedAttachment)
else:
self._draggedShape = None
self.OnBeginDragRight(x, y, keys)
self._oldDragX, self._oldDragY = x, y
elif dragging and self._draggedShape and self._dragState == ContinueDraggingRight:
# Continue dragging
self._draggedShape.GetEventHandler().OnDragRight(False, self._oldDragX, self._oldDragY, keys, self._draggedAttachment)
self._draggedShape.GetEventHandler().OnDragRight(True, x, y, keys, self._draggedAttachment)
self._oldDragX, self._oldDragY = x, y
elif evt.RightUp() and self._draggedShape and self._dragState == ContinueDraggingRight:
self._dragState = NoDragging
self._checkTolerance = True
self._draggedShape.GetEventHandler().OnDragRight(False, self._oldDragX, self._oldDragY, keys, self._draggedAttachment)
self._draggedShape.GetEventHandler().OnEndDragRight(x, y, keys, self._draggedAttachment)
self._draggedShape = None
# All following events sent to canvas, not object
elif dragging and not self._draggedShape and self._dragState == StartDraggingLeft:
self._dragState = ContinueDraggingLeft
self.OnBeginDragLeft(x, y, keys)
self._oldDragX, self._oldDragY = x, y
elif dragging and not self._draggedShape and self._dragState == ContinueDraggingLeft:
# Continue dragging
self.OnDragLeft(False, self._oldDragX, self._oldDragY, keys)
self.OnDragLeft(True, x, y, keys)
self._oldDragX, self._oldDragY = x, y
elif evt.LeftUp() and not self._draggedShape and self._dragState == ContinueDraggingLeft:
self._dragState = NoDragging
self._checkTolerance = True
self.OnDragLeft(False, self._oldDragX, self._oldDragY, keys)
self.OnEndDragLeft(x, y, keys)
self._draggedShape = None
elif dragging and not self._draggedShape and self._dragState == StartDraggingRight:
self._dragState = ContinueDraggingRight
self.OnBeginDragRight(x, y, keys)
self._oldDragX, self._oldDragY = x, y
elif dragging and not self._draggedShape and self._dragState == ContinueDraggingRight:
# Continue dragging
self.OnDragRight(False, self._oldDragX, self._oldDragY, keys)
self.OnDragRight(True, x, y, keys)
self._oldDragX, self._oldDragY = x, y
elif evt.RightUp() and not self._draggedShape and self._dragState == ContinueDraggingRight:
self._dragState = NoDragging
self._checkTolerance = True
self.OnDragRight(False, self._oldDragX, self._oldDragY, keys)
self.OnEndDragRight(x, y, keys)
self._draggedShape = None
# Non-dragging events
elif evt.IsButton():
self._checkTolerance = True
# Find the nearest object
attachment = 0
nearest_object, attachment = self.FindShape(x, y)
if nearest_object: # Object event
if evt.LeftDown():
self._draggedShape = nearest_object
self._draggedAttachment = attachment
self._dragState = StartDraggingLeft
self._firstDragX = x
self._firstDragY = y
elif evt.LeftUp():
# N.B. Only register a click if the same object was
# identified for down *and* up.
if nearest_object == self._draggedShape:
nearest_object.GetEventHandler().OnLeftClick(x, y, keys, attachment)
self._draggedShape = None
self._dragState = NoDragging
elif evt.LeftDClick():
nearest_object.GetEventHandler().OnLeftDoubleClick(x, y, keys, attachment)
self._draggedShape = None
self._dragState = NoDragging
elif evt.RightDown():
self._draggedShape = nearest_object
self._draggedAttachment = attachment
self._dragState = StartDraggingRight
self._firstDragX = x
self._firstDragY = y
elif evt.RightUp():
if nearest_object == self._draggedShape:
nearest_object.GetEventHandler().OnRightClick(x, y, keys, attachment)
self._draggedShape = None
self._dragState = NoDragging
else: # Canvas event
if evt.LeftDown():
self._draggedShape = None
self._dragState = StartDraggingLeft
self._firstDragX = x
self._firstDragY = y
elif evt.LeftUp():
self.OnLeftClick(x, y, keys)
self._draggedShape = None
self._dragState = NoDragging
elif evt.RightDown():
self._draggedShape = None
self._dragState = StartDraggingRight
self._firstDragX = x
self._firstDragY = y
elif evt.RightUp():
self.OnRightClick(x, y, keys)
self._draggedShape = None
self._dragState = NoDragging
def FindShape(self, x, y, info = None, notObject = None):
nearest = 100000.0
nearest_attachment = 0
nearest_object = None
# Go backward through the object list, since we want:
# (a) to have the control points drawn LAST to overlay
# the other objects
# (b) to find the control points FIRST if they exist
rl = self.GetDiagram().GetShapeList()[:]
rl.reverse()
for object in rl:
# First pass for lines, which might be inside a container, so we
# want lines to take priority over containers. This first loop
# could fail if we clickout side a line, so then we'll
# try other shapes.
if object.IsShown() and \
isinstance(object, LineShape) and \
object.HitTest(x, y) and \
((info == None) or isinstance(object, info)) and \
(not notObject or not notObject.HasDescendant(object)):
temp_attachment, dist = object.HitTest(x, y)
# A line is trickier to spot than a normal object.
# For a line, since it's the diagonal of the box
# we use for the hit test, we may have several
# lines in the box and therefore we need to be able
# to specify the nearest point to the centre of the line
# as our hit criterion, to give the user some room for
# manouevre.
if dist < nearest:
nearest = dist
nearest_object = object
nearest_attachment = temp_attachment
for object in rl:
# On second pass, only ever consider non-composites or
# divisions. If children want to pass up control to
# the composite, that's up to them.
if (object.IsShown() and
(isinstance(object, DivisionShape) or
not isinstance(object, CompositeShape)) and
object.HitTest(x, y) and
(info == None or isinstance(object, info)) and
(not notObject or not notObject.HasDescendant(object))):
temp_attachment, dist = object.HitTest(x, y)
if not isinstance(object, LineShape):
# If we've hit a container, and we have already
# found a line in the first pass, then ignore
# the container in case the line is in the container.
# Check for division in case line straddles divisions
# (i.e. is not wholly contained).
if not nearest_object or not (isinstance(object, DivisionShape) or WhollyContains(object, nearest_object)):
nearest_object = object
nearest_attachment = temp_attachment
break
return nearest_object, nearest_attachment
def AddShape(self, object, addAfter = None):
self.GetDiagram().AddShape(object, addAfter)
def InsertShape(self, object):
self.GetDiagram().InsertShape(object)
def RemoveShape(self, object):
self.GetDiagram().RemoveShape(object)
def GetQuickEditMode(self):
return self.GetDiagram().GetQuickEditMode()
def Redraw(self, dc):
self.GetDiagram().Redraw(dc)
def Snap(self, x, y):
return self.GetDiagram().Snap(x, y)
def OnLeftClick(self, x, y, keys = 0):
pass
def OnRightClick(self, x, y, keys = 0):
pass
def OnDragLeft(self, draw, x, y, keys = 0):
pass
def OnBeginDragLeft(self, x, y, keys = 0):
pass
def OnEndDragLeft(self, x, y, keys = 0):
pass
def OnDragRight(self, draw, x, y, keys = 0):
pass
def OnBeginDragRight(self, x, y, keys = 0):
pass
def OnEndDragRight(self, x, y, keys = 0):
pass
|
