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"""
Part of the floatcanvas.Utilities package.
This module contains assorted GUI-related utilities that can be used
with FloatCanvas
So far, they are:
RubberBandBox: used to draw a RubberBand Box on the screen
"""
import wx
from wx.lib.floatcanvas import FloatCanvas
class RubberBandBox:
"""
Class to provide a rubber band box that can be drawn on a Window
"""
def __init__(self, Canvas, CallBack, Tol=5):
"""
To initialize:
RubberBandBox(Canvas, CallBack)
Canvas: the FloatCanvas you want the Rubber band box to be used on
CallBack: is the method you want called when the mouse is
released. That method will be called, passing in a rect
parameter, where rect is: (Point, WH) of the rect in
world coords.
Tol: The tolerance for the smallest rectangle allowed. defaults
to 5. In pixels
Methods:
Enable() : Enables the Rubber Band Box (Binds the events)
Disable() : Enables the Rubber Band Box (Unbinds the events)
Attributes:
CallBack: The callback function, if it's replaced you need to
call Enable() again.
"""
self.Canvas = Canvas
self.CallBack = CallBack
self.Tol = Tol
self.Drawing = False
self.RBRect = None
self.StartPointWorld = None
return None
def Enable(self):
"""
Called when you want the rubber band box to be enabled
"""
# bind events:
self.Canvas.Bind(FloatCanvas.EVT_MOTION, self.OnMove )
self.Canvas.Bind(FloatCanvas.EVT_LEFT_DOWN, self.OnLeftDown)
self.Canvas.Bind(FloatCanvas.EVT_LEFT_UP, self.OnLeftUp )
def Disable(self):
"""
Called when you don't want the rubber band box to be enabled
"""
# unbind events:
self.Canvas.Unbind(FloatCanvas.EVT_MOTION)
self.Canvas.Unbind(FloatCanvas.EVT_LEFT_DOWN)
self.Canvas.Unbind(FloatCanvas.EVT_LEFT_UP)
def OnMove(self, event):
if self.Drawing:
x, y = self.StartPoint
Cornerx, Cornery = event.GetPosition()
w, h = ( Cornerx - x, Cornery - y)
if abs(w) > self.Tol and abs(h) > self.Tol:
# draw the RB box
dc = wx.ClientDC(self.Canvas)
dc.SetPen(wx.Pen('WHITE', 2, wx.SHORT_DASH))
dc.SetBrush(wx.TRANSPARENT_BRUSH)
dc.SetLogicalFunction(wx.XOR)
if self.RBRect:
dc.DrawRectangle(*self.RBRect)
self.RBRect = (x, y, w, h )
dc.DrawRectangle(*self.RBRect)
event.Skip() # skip so that other events can catch these
def OnLeftDown(self, event):
# Start drawing
self.Drawing = True
self.StartPoint = event.GetPosition()
self.StartPointWorld = event.Coords
def OnLeftUp(self, event):
# Stop Drawing
if self.Drawing:
self.Drawing = False
if self.RBRect:
WH = event.Coords - self.StartPointWorld
wx.CallAfter(self.CallBack, (self.StartPointWorld, WH))
self.RBRect = None
self.StartPointWorld = None
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