python - 限制静态文本宽度

Question

我有一个带有多个尺寸调整器和一些仪表的面板，我想将它们扩展到面板所在的工作正常的区域或框架的尺寸。然而，当静态文本的大小增加到大于可用空间时，我遇到了一个问题，面板的边缘和仪表超出了屏幕或可见区域。我想知道是否有一种方法可以阻止文本这样做，方法是用 ... 剪短它而不指定精确的大小，基本上这样它就知道显示区域的边缘在哪里。我可以通过将我更新的文本移动到他们自己的面板来解决这个问题，这样我就可以在他们的面板上调用更新，使仪表保持相同的大小，但文本仍然从我的 StaticBox 中耗尽并从显示屏上消失不理想。

我可以将文本换行，但我注意到空格上的换行符，并且由于我的长文本是文件路径，因此可能没有空格，是否可以在空格以外的其他内容上换行？

换行或截断都可以，只是为了阻止它运行

Answer 1

你不能包装StaticText内容，那么我唯一的解决方案可以看到是“省略”它，即通过前置或缩短它将“...”附加到文件路径。然而，要做到这一点，我相信你的最好的选择是自行绘制(或者简单地子类化)wx.lib.stattext)，在 OnSize 事件上测量文本大小控制并在需要时将“...”添加到您的路径中。

附上概念证明，末尾带有“省略”(即，附加“...”，文件名在末尾被截断)。我收集它扩展到前面加上“...”而不是微不足道的追加。

哦，顺便说一下，在wxPython 2.9中你还可以使用wx.StaticText.Ellipsize (也许)做同样的事情，尽管我有我自己没用过。

代码示例:

import wx
from wx.lib.stattext import GenStaticText as StaticText

if wx.Platform == "__WXMAC__":
    from Carbon.Appearance import kThemeBrushDialogBackgroundActive


class EllipticStaticText(StaticText):

    def __init__(self, parent, id=wx.ID_ANY, label='', pos=wx.DefaultPosition, size=wx.DefaultSize,
                 style=0, name="ellipticstatictext"):
        """
        Default class constructor.

        :param `parent`: the L{EllipticStaticText} parent. Must not be ``None``;
        :param `id`: window identifier. A value of -1 indicates a default value;
        :param `label`: the text label;
        :param `pos`: the control position. A value of (-1, -1) indicates a default position,
         chosen by either the windowing system or wxPython, depending on platform;
        :param `size`: the control size. A value of (-1, -1) indicates a default size,
         chosen by either the windowing system or wxPython, depending on platform;
        :param `style`: the static text style;
        :param `name`: the window name.
        """

        StaticText.__init__(self, parent, id, label, pos, size, style, name)

        self.Bind(wx.EVT_SIZE, self.OnSize)
        self.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)


    def OnSize(self, event):
        """
        Handles the ``wx.EVT_SIZE`` event for L{EllipticStaticText}.

        :param `event`: a `wx.SizeEvent` event to be processed.
        """

        event.Skip()
        self.Refresh()


    def OnEraseBackground(self, event):
        """
        Handles the ``wx.EVT_ERASE_BACKGROUND`` event for L{EllipticStaticText}.

        :param `event`: a `wx.EraseEvent` event to be processed.

        :note: This is intentionally empty to reduce flicker.
        """

        pass


    def OnPaint(self, event):
        """
        Handles the ``wx.EVT_PAINT`` event for L{EllipticStaticText}.

        :param `event`: a `wx.PaintEvent` to be processed.
        """

        dc = wx.BufferedPaintDC(self)        
        width, height = self.GetClientSize()

        if not width or not height:
            return

        clr = self.GetBackgroundColour()

        if wx.Platform == "__WXMAC__":
            # if colour is still the default then use the theme's  background on Mac
            themeColour = wx.MacThemeColour(kThemeBrushDialogBackgroundActive)
            backBrush = wx.Brush(themeColour)
        else:
            backBrush = wx.Brush(clr, wx.SOLID)

        dc.SetBackground(backBrush)
        dc.Clear()

        if self.IsEnabled():
            dc.SetTextForeground(self.GetForegroundColour())
        else:
            dc.SetTextForeground(wx.SystemSettings.GetColour(wx.SYS_COLOUR_GRAYTEXT))

        dc.SetFont(self.GetFont())

        label = self.GetLabel()
        text = self.ChopText(dc, label, width)

        dc.DrawText(text, 0, 0)


    def ChopText(self, dc, text, max_size):
        """
        Chops the input `text` if its size does not fit in `max_size`, by cutting the
        text and adding ellipsis at the end.

        :param `dc`: a `wx.DC` device context;
        :param `text`: the text to chop;
        :param `max_size`: the maximum size in which the text should fit.
        """

        # first check if the text fits with no problems
        x, y = dc.GetTextExtent(text)

        if x <= max_size:
            return text

        textLen = len(text)
        last_good_length = 0

        for i in xrange(textLen, -1, -1):
            s = text[0:i]
            s += "..."

            x, y = dc.GetTextExtent(s)
            last_good_length = i

            if x < max_size:
                break

        ret = text[0:last_good_length] + "..."    
        return ret


    def Example():

        app = wx.PySimpleApp()
        frame = wx.Frame(None, -1, "EllipticStaticText example ;-)", size=(400, 300))

        panel = wx.Panel(frame, -1)
        sizer = wx.BoxSizer(wx.VERTICAL)

        elliptic = EllipticStaticText(panel, -1, r"F:\myreservoir\re\util\python\hm_evaluation\data\HM_Evaluation_0.9.9.7.exe")
        whitePanel = wx.Panel(panel, -1)
        whitePanel.SetBackgroundColour(wx.WHITE)

        sizer.Add(elliptic, 0, wx.ALL|wx.EXPAND, 10)
        sizer.Add(whitePanel, 1, wx.ALL|wx.EXPAND, 10)

        panel.SetSizer(sizer)
        sizer.Layout()

        frame.CenterOnScreen()
        frame.Show()

        app.MainLoop()


    if __name__ == "__main__":

        Example()