【Python】wxPython带颜色的进度条创建

【问题描述】

1、在使用wxpython创建进度条时遇到如下问题，使用SetForegroundColour和SetBackgrounColour指令在Win7下不生效，即无法改变进度条的颜色及其背景颜色。

2、查阅资料发现wx.lib.agw.pygauge可以实现进度条颜色的修改（具体指令请参考pygauge说明文档），但其显示效果为平面较差（如下图）：

图1-1 pygauge制作的进度条

期望实现的进度条效果如下：

图1-2 期望效果图

【程序代码】

# --------------------------------------------------------------------------------- #
# GAUGE wxPython 
#
# Jin Jianchao, @ 25 Oct 2013
# Mail: [email protected]
#
# End Of Comments
# --------------------------------------------------------------------------------- #

"""
Description
===========

Draw color gauge with wxpython

Usage
=====

Usage example::

    import wx
    import Gauge

    class MyFrame(wx.Frame):

        def __init__(self, parent):

            wx.Frame.__init__(self, parent, -1, "ColourGauge Demo")

            panel = wx.Panel(self)
            
            gauge1 = Gauge.ColourGauge(panel, -1, size=(100, 25))
            gauge1.setPercent(0.8)
            gauge1.setBarColour(wx.RED)
            gauge1.setBackgroundColour(wx.WHITE)
            
            gauge2 = Gauge.ColourGauge(panel, -1, size=(200, 50))
            gauge2.setPercent(0.9)
            gauge2.setBarColour(wx.RED)
            gauge2.setBackgroundColour(wx.BLUE)

            sizer = wx.BoxSizer(wx.VERTICAL)
            sizer.Add(gauge1, 0, wx.ALIGN_CENTER_VERTICAL|wx.ALL, 20)
            sizer.Add(gauge2, 0, wx.ALIGN_CENTER_VERTICAL|wx.ALL, 20)
        
            panel.SetSizer(sizer)
            sizer.Layout()


    # our normal wxApp-derived class, as usual

    app = wx.App(0)

    frame = MyFrame(None)
    app.SetTopWindow(frame)
    frame.Show()

    app.MainLoop()
"""

import wx
import wx.lib.fancytext as fancytext

class ColourGauge(wx.Panel):
    
    def __init__(self, parent,id, pos=wx.DefaultPosition, size=wx.DefaultSize):
        wx.Panel.__init__(self, id=id, parent=parent, pos=pos, size=size, style=wx.TAB_TRAVERSAL)
        # creat Gauge
        self.gauge = Gauge(self, id=-1, size=size)
        self.SetAutoLayout(True)
        lc = wx.LayoutConstraints()
        lc.top.SameAs(self, wx.Top, 0) #AsIs()
        lc.left.AsIs()
        lc.height.AsIs()
        lc.right.SameAs(self, wx.Right, 0)
        self.gauge.SetConstraints(lc)  

    def setPercent(self, percent):
        self.gauge.setPercent(percent)
        
    def setBackgroundColour(self, colour):
        self.gauge.SetBackgroundColour(colour)
        
    def setBarColour(self, colour):
        self.gauge.color = colour
        
    def getBarColour(self): 
        return self.gauge.color
    
    def setStep(self,step):
        self.gauge.step=step
        
    def makeStep(self):
        if self.gauge.percent>=1.: return
        self.gauge.percent+=self.gauge.step
        if self.gauge.percent>1.:
            self.gauge.percent=1.
        self.Refresh()
        self.Update()
        
class Gauge(wx.Control):
    default_color = "GREEN"  # "MAGENTA","BLUE"  # "GREEN" "RED" "YELLOW"
    def __init__(self, parent,id,pos=wx.DefaultPosition,size=wx.DefaultSize):
        wx.Control.__init__(self, parent, id, pos, size)
        self.SetBackgroundColour(wx.WHITE)
        self.color= Gauge.default_color
        self.percent = 0.0
        self.step = 0.0
        wx.EVT_PAINT(self, self.OnPaint)

    def OnPaint(self, evt):
        dc = wx.PaintDC(self)
        dc.Clear()
        dc.BeginDrawing()

        dc.SetPen( wx.Pen(self.color,0) )
        dc.SetBrush( wx.Brush(self.color) )
        w,h = self.GetSizeTuple()
        dc.DrawRectangleRect((0,0,w*self.percent,h))
        percentStr= "%d%%"% int(self.percent*100)
        tx, ty = fancytext.getExtent(percentStr, dc)
        dc.DrawText(percentStr, w/2-tx/2, h/2-ty/2)

        dc.EndDrawing()
        
    def setPercent(self,percent):
        if percent <0 or percent >1.:
            return
        self.percent = percent
    def setColor(self,color):
        self.color = color
    def getColor(self): 
        return self.color
    
    def setStep(self,step):
        self.step=step
        
    def makeStep(self):
        if self.percent>=1.: return
        self.percent+=self.step
        if self.percent>1.:
            self.percent=1.
        self.gauge.Refresh()
        self.gauge.Update()