3f4ec51e47
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@45725 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
116 lines
3.3 KiB
Python
116 lines
3.3 KiB
Python
"""
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Part of the floatcanvas.Utilities package.
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This module contains assorted GUI-related utilities that can be used
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with FloatCanvas
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So far, they are:
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RubberBandBox: used to draw a RubberBand Box on the screen
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"""
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import wx
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from floatcanvas import FloatCanvas
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class RubberBandBox:
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"""
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Class to provide a rubber band box that can be drawn on a Window
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"""
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def __init__(self, Canvas, CallBack, Tol=5):
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"""
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To initialize:
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RubberBandBox(Canvas, CallBack)
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Canvas: the FloatCanvas you want the Rubber band box to be used on
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CallBack: is the method you want called when the mouse is
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released. That method will be called, passing in a rect
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parameter, where rect is: (Point, WH) of the rect in
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world coords.
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Tol: The tolerance for the smallest rectangle allowed. defaults
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to 5. In pixels
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Methods:
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Enable() : Enables the Rubber Band Box (Binds the events)
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Disable() : Enables the Rubber Band Box (Unbinds the events)
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Attributes:
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CallBack: The callback function, if it's replaced you need to
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call Enable() again.
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"""
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self.Canvas = Canvas
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self.CallBack = CallBack
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self.Tol = Tol
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self.Drawing = False
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self.RBRect = None
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self.StartPointWorld = None
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return None
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def Enable(self):
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"""
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Called when you want the rubber band box to be enabled
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"""
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# bind events:
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self.Canvas.Bind(FloatCanvas.EVT_MOTION, self.OnMove )
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self.Canvas.Bind(FloatCanvas.EVT_LEFT_DOWN, self.OnLeftDown)
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self.Canvas.Bind(FloatCanvas.EVT_LEFT_UP, self.OnLeftUp )
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def Disable(self):
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"""
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Called when you don't want the rubber band box to be enabled
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"""
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# unbind events:
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self.Canvas.Unbind(FloatCanvas.EVT_MOTION)
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self.Canvas.Unbind(FloatCanvas.EVT_LEFT_DOWN)
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self.Canvas.Unbind(FloatCanvas.EVT_LEFT_UP)
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def OnMove(self, event):
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if self.Drawing:
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x, y = self.StartPoint
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Cornerx, Cornery = event.GetPosition()
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w, h = ( Cornerx - x, Cornery - y)
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if abs(w) > self.Tol and abs(h) > self.Tol:
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# draw the RB box
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dc = wx.ClientDC(self.Canvas)
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dc.SetPen(wx.Pen('WHITE', 2, wx.SHORT_DASH))
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dc.SetBrush(wx.TRANSPARENT_BRUSH)
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dc.SetLogicalFunction(wx.XOR)
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if self.RBRect:
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dc.DrawRectangle(*self.RBRect)
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self.RBRect = (x, y, w, h )
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dc.DrawRectangle(*self.RBRect)
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event.Skip() # skip so that other events can catch these
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def OnLeftDown(self, event):
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# Start drawing
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self.Drawing = True
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self.StartPoint = event.GetPosition()
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self.StartPointWorld = event.Coords
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def OnLeftUp(self, event):
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# Stop Drawing
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if self.Drawing:
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self.Drawing = False
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if self.RBRect:
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WH = event.Coords - self.StartPointWorld
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wx.CallAfter(self.CallBack, (self.StartPointWorld, WH))
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self.RBRect = None
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self.StartPointWorld = None
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