问题描述
我正在构建一个带有 wx.ListCtrl 的 wx.ComboCtrl。这样做的原因是因为我想设置选项的前景色（颜色向用户显示项目的状态）。我希望这些颜色在下拉框和用户进行选择时显示。
我遇到的问题是，在 Linux (Ubuntu 20.04) 上，进行选择后，wx.ComboCtrl 的背景颜色保持蓝色（前景色保持白色），即使我将焦点移到另一个小部件.我为要在 ComboCtrl 上显示的文本设置了哪种颜色并不重要，它仍然是带有蓝色背景的白色文本。看截图。
如果我将焦点移动到另一个窗口然后又回到我自己的窗口，我只能让它显示默认（灰色）背景和我选择的前景色。
在 Windows 中不会发生这种情况：在选择一个项目后，ComboCtrl 的背景颜色是默认的（灰色），但是它确实在选择的周围显示了一条小虚线。看截图。
这是我用来重现问题的修改后的演示代码。代码中的注释是我尝试过的一些东西的遗留物。
#!/usr/bin/env python
import wx
import os
#----------------------------------------------------------------------
#----------------------------------------------------------------------
# This class is used to provide an interface between a ComboCtrl and the
# ListCtrl that is used as the popoup for the combo widget.
class ListCtrlComboPopup(wx.ComboPopup):
def __init__(self):
wx.ComboPopup.__init__(self)
self.lc = None
def AddItem(self,txt,_colour):
self.lc.InsertItem(self.lc.GetItemCount(),txt)
_entry = self.lc.GetItem(self.lc.GetItemCount() - 1)
_entry.SetTextColour(_colour)
#_entry.SetItemTextColour(_colour)
self.lc.SetItem(_entry)
def OnMotion(self,evt):
item,flags = self.lc.HitTest(evt.GetPosition())
if item >= 0:
self.lc.Select(item)
self.curitem = item
def OnLeftDown(self,evt):
self.value = self.curitem
self.dismiss()
# The following methods are those that are overridable from the
# ComboPopup base class. Most of them are not required,but all
# are shown here for demonstration purposes.
# This is called immediately after construction finishes. You can
# use self.GetCombo if needed to get to the ComboCtrl instance.
def Init(self):
self.value = -1
self.curitem = -1
# Create the popup child control. Return true for success.
def Create(self,parent):
self.lc = wx.ListCtrl(parent,style=wx.LC_SINGLE_SEL | wx.SIMPLE_BORDER | wx.LC_REPORT | wx.LC_NO_HEADER)
self.lc.InsertColumn(0,'')
self.lc.Bind(wx.EVT_MOTION,self.OnMotion)
self.lc.Bind(wx.EVT_LEFT_DOWN,self.OnLeftDown)
return True
# Return the widget that is to be used for the popup
def GetControl(self):
return self.lc
# Called just prior to displaying the popup,you can use it to
# 'select' the current item.
def SetStringValue(self,val):
idx = self.lc.FindItem(-1,val)
if idx != wx.NOT_FOUND:
self.lc.Select(idx)
# Return a string representation of the current item.
def GetStringValue(self):
if self.value >= 0:
return self.lc.GetItemText(self.value)
return ""
# Called immediately after the popup is shown
def OnPopup(self):
wx.ComboPopup.OnPopup(self)
# Called when popup is dismissed
def Ondismiss(self):
print (self.GetStringValue())
wx.ComboPopup.Ondismiss(self)
# This is called to custom paint in the combo control itself
# (ie. not the popup). Default implementation draws value as
# string.
def PaintComboControl(self,dc,rect):
wx.ComboPopup.PaintComboControl(self,rect)
# Receives key events from the parent ComboCtrl. Events not
# handled should be skipped,as usual.
def OnComboKeyEvent(self,event):
wx.ComboPopup.OnComboKeyEvent(self,event)
# Implement if you need to support special action when user
# double-clicks on the parent wxComboCtrl.
def OnCombodoubleClick(self):
wx.ComboPopup.OnCombodoubleClick(self)
# Return final size of popup. Called on every popup,just prior to OnPopup.
# minWidth = preferred minimum width for window
# prefheight = preferred height. Only applies if > 0,# maxHeight = max height for window,as limited by screen size
# and should only be rounded down,if necessary.
def GetAdjustedSize(self,minWidth,prefheight,maxHeight):
return wx.ComboPopup.GetAdjustedSize(self,maxHeight)
# Return true if you want delay the call to Create until the popup
# is shown for the first time. It is more efficient,but note that
# it is often more convenient to have the control created
# immediately.
# Default returns false.
def LazyCreate(self):
return wx.ComboPopup.LazyCreate(self)
#----------------------------------------------------------------------
class MyTestPanel(wx.Panel):
def __init__(self,parent,log):
self.log = log
wx.Panel.__init__(self,-1)
txt = wx.TextCtrl(self,wx.ID_ANY,pos=(100,100))
comboCtrl = wx.ComboCtrl(self,"Third item",(10,10),size=(200,-1),style=wx.CB_READONLY)
popupCtrl = ListCtrlComboPopup()
# It is important to call SetPopupControl() as soon as possible
comboCtrl.SetPopupControl(popupCtrl)
# Populate using wx.ListView methods
popupCtrl.AddItem("First Item",[255,127,0])
popupCtrl.AddItem("Second Item",[192,45])
popupCtrl.AddItem("Third Item",[25,223,172])
#popupCtrl.GetAdjustedSize(100,35,100)
#comboCtrl.SetTextColour(_colour)
comboCtrl.SetForegroundColour(wx.Colour(235,55,55))
#----------------------------------------------------------------------
def runTest(frame,nb,log):
win = MyTestPanel(nb,log)
return win
#----------------------------------------------------------------------
overview = """<html><body>
<h2><center>wx.combo.ComboCtrl</center></h2>
A combo control is a generic comboBox that allows a totally custom
popup. In addition it has other customization features. For instance,position and size of the dropdown button can be changed.
</body></html>
"""
if __name__ == '__main__':
import sys,os
import run
run.main(['',os.path.basename(sys.argv[0])] + sys.argv[1:])
问题 1：
如何才能在选择项目后显示适当的文本颜色（我以编程方式设置的颜色）和默认（灰色）背景颜色。
问题 2：
当下拉 ComboCtrl 时，它显示的是 ListCtrl，它只有一列。可以看到列表中的“第二项”没有完全显示，因为列太窄了。我如何才能使列始终与小部件本身的宽度相同，即使 ComboCtrl 调整大小（由于调整父窗口大小）？
问题 3：
不太重要，但是当我们讨论这个主题时：有没有办法摆脱在 Windows 中运行时显示在所选项目周围的小虚线框？
提前，非常感谢您对此的想法和想法。
马克。
解决方法
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