如何在MacOS上制作wxWidgets（使用golang）重绘窗口？

Question

Here's some sample code that puts a Gauge on the screen and make the progress bar increase 1 value every second. On MacOS I don't see the progress bar update unless I drag the window around or resize it manually with the mouse. Any idea how to force the whole thing to repaint? I'm calling f.Refresh() and f.Update()

package main

import "github.com/dontpanic92/wxGo/wx"
import "time"

var g wx.Gauge

type MyFrame struct {
    wx.Frame
}

func (f *MyFrame) startUpload() {
    for {
        time.Sleep(time.Second)
        g.SetValue(g.GetValue() + 1)
        f.Refresh()
        f.Update()
    }
}

func NewMyFrame() MyFrame {
    f := MyFrame{}
    f.Frame = wx.NewFrame(wx.NullWindow, -1, "Test Thread")
    mainSizer := wx.NewBoxSizer(wx.HORIZONTAL)
    g = wx.NewGauge(f, wx.ID_ANY, 100, wx.DefaultPosition, wx.NewSize(600, 40), 0)
    f.SetSizer(mainSizer)
    mainSizer.Add(g, 100, wx.ALL|wx.EXPAND, 50)
    f.Layout()
    go f.startUpload()
    return f
}

func main() {
    wx1 := wx.NewApp()
    f := NewMyFrame()
    f.Show()
    wx1.MainLoop()
    return
}

Update: I've been reading http://docs.wxwidgets.org/trunk/overview_thread.html and I'm trying code like:

b := wx.NewPaintEvent()
f.GetEventHandler().QueueEvent(b)

instead of calling Refresh and Update but my wx.NewPaintEvent doesn't do anything. Maybe I'm making the wx.NewPaintEvent wrong? Or I'm adding it to the wrong EventHandler?

Answer 1

author of wxGo fixed it:

https://github.com/dontpanic92/wxGo/issues/10

  wx.Bind(f, wx.EVT_THREAD, func(e wx.Event) {
    threadEvent := wx.ToThreadEvent(e)
    the_gauge.SetValue(threadEvent.GetInt())
  }, UPLOAD_WORKER_ID)

then in the thread:

threadEvent := wx.NewThreadEvent(wx.EVT_THREAD, UPLOAD_WORKER_ID)
threadEvent.SetInt(50)
f.QueueEvent(threadEvent)