python - wx.ComboCtrl 和 wx.ListCtrl 突出显示背景和大小

Question

我正在构建一个附加了 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）。我希望在下拉框和用户做出选择时显示这些颜色。

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 上显示的文本设置哪种颜色并不重要，它仍然是蓝色背景的白色文本。见截图。

如果我将焦点移到另一个窗口然后回到我自己的窗口，我只能让它显示带有我选择的前景色的默认（灰色）背景。

在 Windows 中不会发生这种情况：选择一个项目后，ComboCtrl 的背景颜色是默认的（灰色），但它确实在选择的周围显示了一条小虚线。见截图。

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事情的遗留物。

#!/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, dc, 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, minWidth, prefHeight, 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, parent, -1)
        
        txt = wx.TextCtrl(self, wx.ID_ANY, pos=(100,100))

        comboCtrl = wx.ComboCtrl(self, wx.ID_ANY, "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, 127, 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:])

问题一：

我怎样才能做到这一点，以便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：

下拉 ComboCtrl 时，它显示 ListCtrl，它只有一列。可以看到列表中的“第二项”没有完全显示出来，因为列太窄了。即使 ComboCtrl 调整大小（作为调整父窗口大小的结果），如何使列始终与小部件本身的宽度相同？

问题 3：

不是很重要，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？

在此先感谢您对此的想法和想法。

马克。

标签： pythonwxpythonwxwidgetslistctrl