Problem: I want to be able to force the scrollbar to the bottom when I call createNewRow(). I can see that the self.Scroll(0, self.scrollRange) is occurring in OnKeyTyped() and the scrollbar moves to the bottom of the window but then the scrollbar moves to the top of the window again. I tried to stop this by binding wx.EVT_SCROLLWIN to OnScroll which calls event.Skip() but it appears that this has not worked. I am out of ideas on how to proceed as I don't know enough about eventHandlers and scroll events in wxPython. Any help on how to proceed would be much appreciated. Full code below.
import os
import wx
import datetime as dt
import wx.lib.scrolledpanel as scrolled
class MyFrame(wx.Frame):
width = 1000
height = 600
today = dt.date.today()
today_date = f"{today:%A - %d %B %Y}"
filename = f"Worklog {today_date}"
wxTHICK_LINE_BORDER = 3
def __init__(self, parent=None, title=filename, size=(width,height - 1)):
wx.Frame.__init__(self, parent=parent, title=title, size=size)
self.parent = parent
self.title = title
self.size = size
self.BuildMenuBar()
def BuildMenuBar(self):
# Menu bar
self.menuBar = wx.MenuBar()
self.fileMenu = wx.Menu()
self.NewOpt = wx.MenuItem(self.fileMenu, wx.ID_NEW, '&New\tCtrl+N')
self.OpenOpt = wx.MenuItem(self.fileMenu, wx.ID_OPEN, '&Open\tCtrl+O')
self.SaveOpt = wx.MenuItem(self.fileMenu, wx.ID_SAVE, '&Save\tCtrl+S')
self.QuitOpt = wx.MenuItem(self.fileMenu, wx.ID_EXIT, '&Quit\tCtrl+Q')
self.fileMenu.Append(self.NewOpt)
self.fileMenu.Append(self.OpenOpt)
self.fileMenu.Append(self.SaveOpt)
self.fileMenu.Append(self.QuitOpt)
self.Bind(wx.EVT_MENU, self.OnQuit, self.QuitOpt)
self.menuBar.Append(self.fileMenu, '&File')
self.SetMenuBar(self.menuBar)
def OnQuit(self, e):
self.Close()
class MyPanel(wx.Panel):
def __init__(self,parent):
wx.Panel.__init__(self, parent=parent)
self.parent = parent
self.size = parent.size
panel_colour = wx.Colour(240, 240, 240, 255)
self.SetBackgroundColour(panel_colour)
self.Refresh()
class MyScrolledPanel(scrolled.ScrolledPanel):
def __init__(self, parent):
scrolled.ScrolledPanel.__init__(self, parent=parent, style = wx.TAB_TRAVERSAL | wx.TB_BOTTOM)
self.parent = parent
# self.size = parent.size
self.width = parent.size[0]
self.height = parent.size[1]
scrollpanel_colour = wx.Colour(255, 255, 255, 255)
self.SetBackgroundColour(scrollpanel_colour)
# Call a refresh to update the UI
self.Refresh()
self.SetAutoLayout(True)
self.SetupScrolling()
self.InitUI()
self.Bind(wx.EVT_SCROLLWIN, self.OnScroll, self)
self.Bind(wx.EVT_SIZE, self.OnSize, self)
def OnScroll(self, e):
e.Skip()
def InitUI(self):
vgap = 0
hgap = 0
self.rowList = []
self.n = 0
self.scrollSizer = wx.GridBagSizer(vgap + 10, hgap + 10)
self.row = self.CreateNewRow(self.n)
self.rowList.append(self.row)
print(f"Row List: {self.rowList[-1]}")
self.scrollSizer.Add(self.row[0], pos = (self.i, 0), flag = wx.ALL | wx.ALIGN_CENTER | wx.ALIGN_CENTER_VERTICAL, border = 10)
self.scrollSizer.Add(self.row[1], pos = (self.i, 1), flag = wx.EXPAND | wx.TOP | wx.RIGHT | wx.ALIGN_CENTER | wx.ALIGN_CENTER_VERTICAL , border = 10)
self.scrollSizer.AddGrowableCol(1)
self.SetSizer(self.scrollSizer)
self.panelSizer = wx.GridBagSizer(vgap, hgap)
self.panelSizer.AddGrowableRow(0)
self.panelSizer.AddGrowableCol(0)
self.panelSizer.Add(self, pos = (0, 0), flag = wx.EXPAND, border = 0) # Add wx.Window not wx.Sizer
self.parent.SetSizer(self.panelSizer)
def CreateNewRow(self, number):
self.i = number
self.txtStr = "%02d" % (self.i+1) + ". "
self.staticText = wx.StaticText(self, wx.ID_ANY, self.txtStr)
#pos = (x, y)
#self.staticText.SetForegroundColour(wx.Colour(0,0,0))
self.control = wx.TextCtrl(self, self.i)
self.control.SetMaxLength(256)
self.text_history_length = 0
self.control.Bind(wx.EVT_TEXT, self.OnKeyTyped, id = self.i)
#self.control = wx.TextCtrl(self, -1, pos = (x + w + 5,y) )
#style = wx.TE_MULTILINE
elems = [self.staticText, self.control]
return elems
def OnSize(self, e):
self.width, self.height = e.GetSize()
self.SetSize((self.width, self.height))
self.OnSizeChange()
self.Refresh()
def OnSizeChange(self):
# Fit child elements
self.scrollSizer.FitInside(self)
# Resize layout
self.Layout()
# Resize scrolling
self.SetupScrolling()
def OnKeyTyped(self, e):
self.text_length = len(e.GetString())
if (self.text_history_length == 1 and self.text_length == 0):
print(f"History length: {self.text_history_length}")
print(f"Text length: {self.text_length}")
self.text_history_length = self.text_length
pass
elif (self.text_history_length == 0 and self.text_length == 1):
print(f"History length: {self.text_history_length}")
print(f"Text length: {self.text_length}")
self.n += 1
self.row = self.CreateNewRow(self.n)
print(f"Action: {self.row}")
print(f"Row List: {self.rowList[-1]}")
self.rowList.append(self.row)
self.scrollSizer.Add(self.row[0], pos = (self.n, 0), flag = wx.ALL | wx.ALIGN_CENTER | wx.ALIGN_CENTER_VERTICAL, border = 10)
self.scrollSizer.Add(self.row[1], pos = (self.n, 1), flag = wx.EXPAND | wx.TOP | wx.RIGHT | wx.ALIGN_CENTER | wx.ALIGN_CENTER_VERTICAL , border = 10)
self.SetupScrolling()
self.text_history_length = self.text_length
self.rowList[self.n-1][1].Bind(wx.EVT_TEXT, None, id = self.n-1)
self.text_history_length = 0
else:
print(f"History length: {self.text_history_length}")
print(f"Text length: {self.text_length}")
self.text_history_length = self.text_length
self.rowList[-1][1].SetFocus()
self.scrolledPanelChild = self.GetChildren()[-1] # [ scrollPanel ]
self.ScrollChildIntoView(self.scrolledPanelChild)
self.OnSizeChange()
self.scrollRange = self.GetScrollRange(wx.VERTICAL)
print(f"ScrollRange: {self.scrollRange}")
#self.scrollUnits = self.GetScrollPixelsPerUnit()
#print(f"ScrollUnit: {self.scrollUnits}")
#self.scrollThumb = self.GetScrollThumb(wx.VERTICAL)
#print(f"ScrollThumb: {self.scrollThumb}")
self.Scroll(0, self.scrollRange)
def main():
app = wx.App(False)
app.locale = wx.Locale(wx.Locale.GetSystemLanguage())
frame = MyFrame()
panel = MyPanel(frame)
scrolledPanel = MyScrolledPanel(panel)
frame.Show(True)
app.MainLoop()
if __name__ == "__main__":
main()
Old question but still. This can be solved using:
wx.CallAfter(self._scrolled_panel.ScrollChildIntoView, new_text) Or calling any of the other scroll methods from the CallAfter.
or
SetupScrolling(scrollIntoView=True, scrollToTop=False)