更改Canvas ScaledText的背景颜色

Question

I'm using wxPython Canvas ' AddScaledTextBox(...) to create a scaled Text Box.

See here for example:

Box = Canvas.AddScaledTextBox("A Two Line\nString",
                                  Point,
                                  2,
                                  BackgroundColor = "Yellow",
                                  LineColor = "Red",
                                  LineStyle = "Solid",
                                  PadSize = 5,
                                  Family = wx.TELETYPE,
                                  Position = 'bl')

How to change the Background color, later, after the textbox has been defined? (for example user input => background color change)

Answer 1

The ScaledTextBox class derives from TextObjectMixin which has SetColor and SetBackgroundColor methods.

Code:

import wx
from wx.lib.floatcanvas import FloatCanvas

class TestFrame(wx.Frame):
    def __init__(self, *args, **kwargs):
        wx.Frame.__init__(self, *args, **kwargs)
        self.canvas = FloatCanvas.FloatCanvas(self, BackgroundColor = "black")
        MainSizer = wx.BoxSizer(wx.VERTICAL)
        MainSizer.Add(self.canvas, 4, wx.EXPAND)
        self.SetSizer(MainSizer)
        self.A = self.canvas.AddScaledTextBox('yoda', (0,0), Position = 'tl', Alignment = 'center', PadSize = 10, Size = 15, Width = 150, BackgroundColor = 'white')
        self.A.Bind(FloatCanvas.EVT_FC_LEFT_DOWN, self.OnRectDown)
        wx.CallAfter(self.canvas.ZoomToBB)

    def OnRectDown(self, event):
        print 'Rectangle: Left Button down clicked at:', event.HitCoords
        if self.A.Color == 'red':
            self.A.SetColor('black')
        else:
            self.A.SetColor('red')
        self.canvas.Draw(True)

app = wx.App(0)
frame = TestFrame(None, title="Test")
frame.Show(True)
app.MainLoop()

EDIT: Forced a redraw of the canvas after the color change. Also, changing the background color isn't sticking for some reason, so I switched to demoing changing the text color.

Removed secondary edit because it was just creating a new text box instead of updating the original.

Answer 2

Pretty sure this is a bug. See lines 1841 - 1845 in the wxPython source - there is a reference to self.BackgroundColor but it's never used.

So for your example, you need to set the color of the brush associated with the text box. I've based the following off of Robin Dunn's example. The function SetBoxBackground is the important part.

As noted in the comments, just calling box.Brush.SetColour(color) or box.Pen.SetColour(color) can cause issues: if you have two text boxes with the same color, changing the brush/pen color for one will also affect the other. (I'm not 100% sure, but I think this is because of caching, see for example this comment in the source .)

import wx
from wx.lib.floatcanvas import FloatCanvas

class TestFrame(wx.Frame):
    def __init__(self, *args, **kwargs):
        wx.Frame.__init__(self, *args, **kwargs)
        self.canvas = FloatCanvas.FloatCanvas(self, BackgroundColor = "black")
        MainSizer = wx.BoxSizer(wx.VERTICAL)
        MainSizer.Add(self.canvas, 4, wx.EXPAND)
        self.SetSizer(MainSizer)
        self.box = self.canvas.AddScaledTextBox("A Two Line\nString",
                                  (0,10),
                                  2,
                                  BackgroundColor = "Yellow",
                                  LineColor = "Red",
                                  LineStyle = "Solid",
                                  PadSize = 5,
                                  Family = wx.TELETYPE,
                                  Position = 'bl')
        self.box2 = self.canvas.AddScaledTextBox("Second Box",
                                  (0,0),
                                  2,
                                  BackgroundColor = "Yellow",
                                  LineColor = "Red",
                                  LineStyle = "Solid",
                                  PadSize = 5,
                                  Family = wx.TELETYPE,
                                  Position = 'bl')
        self.box.Bind(FloatCanvas.EVT_FC_LEFT_DOWN, self.OnRectDown)
        wx.CallAfter(self.canvas.ZoomToBB)

    def OnRectDown(self, event):
        print ('Rectangle: Left Button down clicked at:', event.HitCoords)
        if self.box.Color == 'red':
            self.SetBoxBackground('green', "Solid")
            self.box.SetColor('black')
        else:
            self.SetBoxBackground('white', "Solid")
            self.box.SetColor('red')
        self.canvas.ClearBackground()
        self.canvas.Refresh()
        self.canvas.Draw(True)

    def SetBoxBackground(self, color, style, linewidth=1):
        # See https://github.com/wxWidgets/wxPython/blob/master/wx/lib/floatcanvas/FloatCanvas.py#L1841

        # Create a new brush (fill) with specified color
        self.box.SetBrush(color, style)
        # Create a new pen (line) with specified color
        self.box.SetPen(color, style, linewidth)
        self.box.SetBackgroundColor(color) # Now this works correctly

app = wx.App(0)
frame = TestFrame(None, title="Test")
frame.Show(True)
app.MainLoop()