wxPython - 如何“突出显示”一个 TextCtrl？

Question

在我的 GUI 中，我使用 TextCtrls 进行用户输入。该工具将引导用户完成一些必须输入不同输入的步骤。因此，如果 TextCtrl 是强制性的但为空，我想在许多带有红色边框的工具和网站上将它们突出显示为常见。 经过一些研究，我注意到如果不创建自定义小部件，这是不可能的。

那么除了改变它的背景颜色之外，有没有一种“标准”的方式来突出它？

如果有人需要测试任何东西的最小示例：

import wx

class Example(wx.Frame):

    def __init__(self, *args, **kw):
        super(Example, self).__init__(*args, **kw)

        self.InitUI()

    def InitUI(self):
        pnl = wx.Panel(self)
        test_text_ctrl = wx.TextCtrl(pnl)        

        self.SetSize((350, 250))
        self.Centre()

def main():
    app = wx.App()
    ex = Example(None)
    ex.Show()
    app.MainLoop()

if __name__ == '__main__':
    main() 

Answer 1

我的原生解决方案是将每个 textctrl 放在他们自己的可以着色的面板上。这会在每个 textctrl 周围产生边框的错觉。这是一个例子：

import wx, traceback

# sets the width of the highlight border
HIGHLIGHT_WIDTH = 2
HIGHLIGHT_COLOR = (255, 0, 0)


class Mainframe(wx.Frame):

    def __init__(self, parent=None):
        self.bg_color = wx.SystemSettings.GetColour(wx.SYS_COLOUR_MENU)
        self.highligt_color = wx.Colour(HIGHLIGHT_COLOR)

        wx.Frame.__init__(self, parent, id=wx.ID_ANY, title="Highlight TextCtrl Test", size=wx.Size(500, 300),
                          style=wx.DEFAULT_FRAME_STYLE | wx.TAB_TRAVERSAL)
        self.SetBackgroundColour(self.bg_color)

        main_sizer = wx.BoxSizer(wx.VERTICAL)

        self.textctrl_panel = wx.Panel(self)
        self.textctrl_panel.SetBackgroundColour(self.highligt_color)

        textctrl_panel_sizer = wx.BoxSizer(wx.VERTICAL)

        self.textctrl = wx.TextCtrl(self.textctrl_panel)
        textctrl_panel_sizer.Add(self.textctrl, 0, wx.ALL, HIGHLIGHT_WIDTH)

        self.textctrl_panel.SetSizer(textctrl_panel_sizer)
        self.textctrl_panel.Layout()
        textctrl_panel_sizer.Fit(self.textctrl_panel)
        main_sizer.Add(self.textctrl_panel, 0, wx.ALIGN_CENTER_HORIZONTAL, 5)

        self.SetSizer(main_sizer)
        self.Layout()

        self.Centre(wx.BOTH)

        self.textctrl.Bind(wx.EVT_TEXT, self.on_text)

        # to reduce flickering
        self.SetDoubleBuffered(True)
        self.CenterOnScreen(wx.BOTH)
        self.Show()

    def on_text(self, event):
        """ triggered every time the text ctrl text is updated, schedules validate_text() to run after the event """
        event.Skip()
        wx.CallAfter(self.validate_text)

    def validate_text(self):
        """ sets the textctrl panel background color to give the appearance
        of a red highlight if there is no text in the text ctrl """
        color = self.bg_color if self.textctrl.GetValue() else self.highligt_color
        self.textctrl_panel.SetBackgroundColour(color)
        # force the window to repaint
        self.textctrl_panel.Refresh()


try:

    app = wx.App()
    frame = Mainframe()
    app.MainLoop()
except:
    input(traceback.format_exc())