在Sizer中绘制面板

Question

我正在尝试创建一个wx.Panel派生类，它将显示旋转的文本。然而，当这个小部件被添加到一个wx.Sizer时，文本就不再显示了。当将文本直接添加到wx.Frame时，文本会显示，但会被截断。我做错了什么？

import wx

class Win(wx.Frame):
    def __init__(self):
        super(Win, self).__init__(None, wx.ID_ANY)
        self.p = wx.Panel(self, wx.ID_ANY)
        self.p.SetSizer(wx.BoxSizer())
        self.rt = RotatedText(self.p, wx.ID_ANY, 'hello', 90)
        self.p.GetSizer().Add(self.rt)


class RotatedText(wx.Window):
    def __init__(self, parent, id, text, angle, font=None, *args, **kwargs):
        super(RotatedText, self).__init__(parent, id, *args, **kwargs)
        self.text = text
        self.font = font
        self.angle = angle
        self.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_SIZE, self.OnSize)

    def repaint(self, dc):
        if self.font:
            dc.SetFont(self.font)
        text_height, text_width = dc.GetTextExtent(self.text)
        dc.SetTextForeground(wx.BLACK)
        dc.DrawText(self.text, 0, 0)

    def OnPaint(self, event):
        dc = wx.PaintDC(self)
        self.repaint(dc)
        event.Skip()

    def OnSize(self, event):
        dc = wx.ClientDC(self)
        self.repaint(dc)
        event.Skip()

app = wx.App()
win = Win()
win.Show()
app.MainLoop()

请注意，我使用的是dc.DrawText()而不是dc.DrawRotatedText()，因为我试图将问题归结为最简单的形式。最后，我确实希望使用dc.DrawRotatedText()。

Answer 1

当创建自定义窗口时，给它一个显式的大小。下面我列举了一个例子。

由于自定义窗口没有任何与其相关的控件，因此sizer假设它是空的，并将它“压缩”到尽可能小的大小(可能是0,0)。

我还添加了绘图旋转文本方法调用和一些任意大小。当然，你可以玩这些，直到它适合你的需要。

import wx

class Win(wx.Frame):
    def __init__(self):
        super(Win, self).__init__(None, wx.ID_ANY)
        self.p = wx.Panel(self, wx.ID_ANY)
        self.p.SetSizer(wx.BoxSizer())
        # set the minimum size when creating the custom window so that the sizer doesn't "squash" it to 0,0
        self.rt = RotatedText(self.p, wx.ID_ANY, 'hello', 90,size=(60,60))
        self.p.GetSizer().Add(self.rt)


class RotatedText(wx.Window):
    def __init__(self, parent, id, text, angle, font=None, *args, **kwargs):
        super(RotatedText, self).__init__(parent, id, *args, **kwargs)
        self.text = text
        self.font = font
        self.angle = angle
        self.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_SIZE, self.OnSize)

        # set our minimum size based on the text with
        dc = wx.MemoryDC()
        self.text_width, self.text_height= dc.GetTextExtent(self.text)
        # height and width are reversed since we are drawing text vertically
        self.SetMinSize((self.text_height,self.text_width)) 

    def repaint(self, dc):
        if self.font:
            dc.SetFont(self.font)
        text_width, text_height = dc.GetTextExtent(self.text)
        dc.SetTextForeground(wx.BLACK)
        #dc.DrawText(self.text, 0, 0) # change this line to start drawing from bottom to top beginning 60 units from top
        dc.DrawRotatedText(self.text, 0, self.text_width, self.angle)

    def OnPaint(self, event):
        dc = wx.PaintDC(self)
        self.repaint(dc)
        event.Skip()

    def OnSize(self, event):
        dc = wx.ClientDC(self)
        self.repaint(dc)
        event.Skip()

app = wx.App()
win = Win()
win.Show()
app.MainLoop()