Python位图不会在按钮上绘制/显示

Question

我已经在这个项目上工作了一段时间了-它最初应该是一个测试，看看使用wxPython，我是否可以“从头开始”构建一个按钮。从头开始意味着：我将完全控制按钮的所有方面（即控制显示的BMP。。。事件处理程序所做的。。。等等）

我遇到了几个问题（因为这是我的第一个python项目）。在

基本代码-不工作

    dc = wx.BufferedPaintDC(self)
    dc.SetFont(self.GetFont())
    dc.SetBackground(wx.Brush(self.GetBackgroundColour()))
    dc.Clear()
    dc.DrawBitmap(wx.Bitmap("/home/wallter/Desktop/Mouseover.bmp"), 100, 100)

    self.Refresh()
    self.Update()

满的主.py在

^{pr2}$

满的自定义按钮.py在

import wx
from wxPython.wx import *

class Custom_Button(wx.PyControl):

    def __init__(self, parent, id, Pos, Over_BMP, Norm_BMP, Push_BMP,  **kwargs):
        wx.PyControl.__init__(self,parent, id, **kwargs)

        self.Bind(wx.EVT_LEFT_DOWN, self._onMouseDown)
        self.Bind(wx.EVT_LEFT_UP, self._onMouseUp)
        self.Bind(wx.EVT_LEAVE_WINDOW, self._onMouseLeave)
        self.Bind(wx.EVT_ENTER_WINDOW, self._onMouseEnter)
        self.Bind(wx.EVT_ERASE_BACKGROUND,self._onEraseBackground)
        self.Bind(wx.EVT_PAINT,self._onPaint)

        self.pos = Pos

        self.Over_bmp = Over_BMP
        self.Norm_bmp = Norm_BMP
        self.Push_bmp = Push_BMP

        self._mouseIn = False
        self._mouseDown = False

    def _onMouseEnter(self, event):
        self._mouseIn = True

    def _onMouseLeave(self, event):
        self._mouseIn = False

    def _onMouseDown(self, event):
        self._mouseDown = True

    def _onMouseUp(self, event):
        self._mouseDown = False
        self.sendButtonEvent()

    def sendButtonEvent(self):
        event = wx.CommandEvent(wx.wxEVT_COMMAND_BUTTON_CLICKED, self.GetId())
        event.SetInt(0)
        event.SetEventObject(self)
        self.GetEventHandler().ProcessEvent(event)

    def _onEraseBackground(self,event):
        # reduce flicker
        pass

    def Iz(self):
        dc = wx.BufferedPaintDC(self)
        dc.DrawBitmap(self.Norm_bmp, 100, 100)

    def _onPaint(self, event):
        # The printing functions, they should work... but don't.
        dc = wx.BufferedPaintDC(self)
        dc.SetFont(self.GetFont())
        dc.SetBackground(wx.Brush(self.GetBackgroundColour()))
        dc.Clear()
        dc.DrawBitmap(self.Norm_bmp)

        # This never printed... I don't know if that means if the EVT
        # is triggering or what.
        print '_onPaint'

        # draw whatever you want to draw
        # draw glossy bitmaps e.g. dc.DrawBitmap
        if self._mouseIn:   # If the Mouse is over the button
            dc.DrawBitmap(self.Over_bmp, self.pos)
        else: # Since the mouse isn't over it Print the normal one
              # This is adding on the above code to draw the bmp
              # in an attempt to get the bmp to display; to no avail.
            dc.DrawBitmap(self.Norm_bmp, self.pos)
        if self._mouseDown: # If the Mouse clicks the button
            dc.DrawBitmap(self.Push_bmp, self.pos)

这个密码不管用？我没有显示BMP为什么？我怎么买？我已经得到了staticBitmap(...)来显示一个，但它不会移动、调整大小或任何其他操作。。。-只在画面的左上角？在

注：框架为400pxl X 400pxl-和“/home/wallter/Desktop”/Mouseover.bmp““

Answer 1

你确定你的代码没有异常的工作，因为当我运行它时，我会遇到很多错误，阅读下面的要点，你应该有一个按钮，至少画正确

1. 当O运行它时，它会出错，因为Custom_Button被传递的是空父代，而不是传递帧，例如Custom_Button(self, ...)

2. 您的drawBitmap调用也错误，它引发异常，而不是dc.DrawBitmap(self.Norm_bmp)，它应该是dc.DrawBitmap(self.Norm_bmp, 0, 0)

3. dc.DrawBitmap(self.Over_bmp, self.pos)也抛出错误，因为pos应该是x，y不是元组，所以改为dc.DrawBitmap(self.Over_bmp, *self.pos)

4. 最后你不需要做“从wxPython.wx版import*“相反，只需执行“from wx import*”而不是wxXXX类名使用wx.XXX，而不是{}使用True等

这是我的工作代码

from wx import *

ID_ABOUT = 101
ID_EXIT  = 102


class Custom_Button(wx.PyControl):

    def __init__(self, parent, id, Pos, Over_BMP, Norm_BMP, Push_BMP,  **kwargs):
        wx.PyControl.__init__(self,parent, id, **kwargs)

        self.Bind(wx.EVT_LEFT_DOWN, self._onMouseDown)
        self.Bind(wx.EVT_LEFT_UP, self._onMouseUp)
        self.Bind(wx.EVT_LEAVE_WINDOW, self._onMouseLeave)
        self.Bind(wx.EVT_ENTER_WINDOW, self._onMouseEnter)
        self.Bind(wx.EVT_ERASE_BACKGROUND,self._onEraseBackground)
        self.Bind(wx.EVT_PAINT,self._onPaint)

        self.pos = Pos

        self.Over_bmp = Over_BMP
        self.Norm_bmp = Norm_BMP
        self.Push_bmp = Push_BMP

        self._mouseIn = False
        self._mouseDown = False

    def _onMouseEnter(self, event):
        self._mouseIn = True

    def _onMouseLeave(self, event):
        self._mouseIn = False

    def _onMouseDown(self, event):
        self._mouseDown = True

    def _onMouseUp(self, event):
        self._mouseDown = False
        self.sendButtonEvent()

    def sendButtonEvent(self):
        event = wx.CommandEvent(wx.wxEVT_COMMAND_BUTTON_CLICKED, self.GetId())
        event.SetInt(0)
        event.SetEventObject(self)
        self.GetEventHandler().ProcessEvent(event)

    def _onEraseBackground(self,event):
        # reduce flicker
        pass

    def Iz(self):
        dc = wx.BufferedPaintDC(self)
        dc.DrawBitmap(self.Norm_bmp, 100, 100)

    def _onPaint(self, event):
        # The printing functions, they should work... but don't.
        dc = wx.BufferedPaintDC(self)
        dc.SetFont(self.GetFont())
        dc.SetBackground(wx.Brush(self.GetBackgroundColour()))
        dc.Clear()
        dc.DrawBitmap(self.Norm_bmp, 0, 0)

        # This never printed... I don't know if that means if the EVT
        # is triggering or what.
        print '_onPaint'

        # draw whatever you want to draw
        # draw glossy bitmaps e.g. dc.DrawBitmap
        if self._mouseIn:   # If the Mouse is over the button
            dc.DrawBitmap(self.Over_bmp, *self.pos)
        else: # Since the mouse isn't over it Print the normal one
              # This is adding on the above code to draw the bmp
              # in an attempt to get the bmp to display; to no avail.
            dc.DrawBitmap(self.Norm_bmp, *self.pos)
        if self._mouseDown: # If the Mouse clicks the button
            dc.DrawBitmap(self.Push_bmp, *self.pos)

class MyFrame(wx.Frame):
    def __init__(self, parent, ID, title):
        wx.Frame.__init__(self, parent, ID, title,
                         wx.DefaultPosition, wx.Size(400, 400))

        self.CreateStatusBar()
        self.SetStatusText("Program testing custom button overlays")
        menu = wx.Menu()
        menu.Append(ID_ABOUT, "&About", "More information about this program")
        menu.AppendSeparator()
        menu.Append(ID_EXIT, "E&xit", "Terminate the program")
        menuBar = wx.MenuBar()
        menuBar.Append(menu, "&File");
        self.SetMenuBar(menuBar)

        # The call for the 'Experiential button' 
        s = r"D:\virtual_pc\mockup\mockupscreens\embed_images\toolbar\options.png"
        self.Button1 = Custom_Button(self, -1, 
                                     wx.Point(100, 100),
                                     wx.Bitmap(s),
                                     wx.Bitmap(s),
                                     wx.Bitmap(s))

        self.Button1.Show(True)  

        EVT_MENU(self, ID_ABOUT, self.OnAbout)
        EVT_MENU(self, ID_EXIT,  self.TimeToQuit)

    def OnAbout(self, event):
        dlg = wxMessageDialog(self, "Testing the functions of custom "
                              "buttons using pyDev and wxPython",
                              "About", wxOK | wxICON_INFORMATION)
        dlg.ShowModal()
        dlg.Destroy()


    def TimeToQuit(self, event):
        self.Close(true)



class MyApp(wx.App):
    def OnInit(self):
        frame = MyFrame(None, -1, "wxPython | Buttons")
        frame.Show(True)
        self.SetTopWindow(frame)
        return True

app = MyApp(0)
app.MainLoop()