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我正在尝试在 wxpython 程序中实现平移功能。该程序由一个包含 ScrolledWindow 的框架组成，该 ScrolledWindow 包含一个位图图像。

在空白面板上单击和平移会产生预期的行为。在图像上单击和平移会产生大约 10 像素的“跳跃”。

如果在拖动过程中 mouse_pos 成员没有更新，则在图像上平移是平滑的，但在空白面板上平移是错误的。

系统信息：wxpython 2.8.12.1、Python 2.7.3 64bit 和 Windows 7 64bit。

import wx
import inspect
import threading

class MyFrame(wx.Frame):
    def __init__(self, parent, mytitle):
        wx.Frame.__init__(self, parent, wx.ID_ANY, mytitle, size=(350, 350))

        self.scrollwin = wx.ScrolledWindow(self, wx.ID_ANY)
        width = 1000
        height = 1000
        self.scrollwin.SetScrollbars(20, 20, width/20, height/20)
        self.scrollwin.SetScrollRate(1, 1)
        self.scrollwin.Bind(wx.EVT_MOTION, self.on_mouse_drag)
        self.scrollwin.Bind(wx.EVT_LEFT_DOWN, self.on_left_down)
        self.SetCursor(wx.StockCursor(wx.CURSOR_HAND))

        image_file = "test.jpg"
        image = wx.Bitmap(image_file)
        sb = wx.StaticBitmap(self.scrollwin, wx.ID_ANY, image)
        sb.Bind(wx.EVT_MOTION, self.event_defer)
        sb.Bind(wx.EVT_LEFT_DOWN, self.event_defer)
        self._mouse_pos = (0, 0)
        self.sem = threading.Semaphore(0)

    @property
    def mouse_pos(self):
        return self._mouse_pos

    @mouse_pos.setter
    def mouse_pos(self, value):
        print "mouse_pos:"
        print "Calling from: ", inspect.stack()[1][3]
        print value
        self._mouse_pos = value

    def on_mouse_drag(self, event):
        if event.Dragging() and event.LeftIsDown():
            self.sem.release()
            print self.sem._Semaphore__value
            (mouse_x, mouse_y) = self.mouse_pos

            #new_pos = self.scrollwin.CalcUnscrolledPosition(event.GetPosition()).Get()
            #new_pos = self.scrollwin.CalcScrolledPosition(event.GetPosition()).Get()
            new_pos = event.GetPositionTuple()
            (new_x, new_y) = new_pos

            scrollpos = self.scrollwin.GetViewStart()
            (scroll_x, scroll_y) = scrollpos

            (delta_x, delta_y) = ((new_x - mouse_x), (new_y - mouse_y))

            (scroll_x, scroll_y) = ((scroll_x - delta_x), (scroll_y - delta_y))
            print "Scroll:"
            print (scroll_x, scroll_y)
            self.scrollwin.Scroll(scroll_x, scroll_y)

            #self.mouse_pos = self.scrollwin.CalcUnscrolledPosition(event.GetPosition()).Get()
            #self.mouse_pos = self.scrollwin.CalcScrolledPosition(event.GetPosition()).Get()
            self.mouse_pos = new_pos # Disabling this gives smooth panning on the image

            self.sem.acquire(False)

    def on_left_down(self, event):
        #self.mouse_pos = self.scrollwin.CalcUnscrolledPosition(event.GetPosition()).Get()
        #self.mouse_pos = self.scrollwin.CalcScrolledPosition(event.GetPosition()).Get()
        self.mouse_pos = event.GetPositionTuple()

    def event_defer(self, event):
        event.ResumePropagation(1)
        event.Skip()

app = wx.App()
MyFrame(None, "Test wx.ScrolledWindow()").Show()
app.MainLoop()
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1 回答 1

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我偶然发现了这个，但我尝试运行它，它看起来很棒，当我平移图像时没有跳跃。我在 Ubuntu 12.04（64 位）上运行 python 2.7.3，所以 Windows 可能存在问题，但它在 Linux 上运行良好。

于 2013-10-22T12:29:41.907 回答