Question

我有一个wxpython网格，我正在更改单元格的背景颜色，以显示它已经发生了什么。

我希望淡入/淡出颜色变化（如浏览器中的JavaScript），以获得更流畅的外观。这可能吗？

现在，我只是改变背景颜色，然后在1.5秒的间隔后将其改回来。

def do_stuf(self):
    # ... stuff ...
    wx.CallAfter(self.HighlightCell, row, col)

def HighlightCell(self, row, col):
    self.grid.Table.highlight = (row, col)
    self.grid.ForceRefresh()
    wx.CallLater(1500, self.ClearCellHighlight)

def ClearCellHighlight(self):
    self.grid.Table.highlight = None
    self.grid.ForceRefresh()

然后在虚拟表中，我检查单元格是否需要突出显示：

def GetAttr(self, row, col, kind):
    """
    Use this callback to set the cell's background color
    """
    attr = wx.grid.GridCellAttr()
    if (row, col) == self.highlight:
        attr.SetBackgroundColour("green")
    elif row % 2:
        attr.SetBackgroundColour("white")
    else:
        attr.SetBackgroundColour("#e7ffff")

    return attr

或者，还有另一种漂亮的方式来表明单元格的内容已经改变了吗？

Answer 1

这是我前一段时间做的事情，用于获取ListCtrl，其中的项目在删除时淡出。将代码保存到fade.py并运行它以查看演示。不应该太难以使其适应网格。

import wx

class FadeMixin(object):
    ''' FadeMixin provides one public method: DeleteItem. It is meant to
    be mixed in with a ListCtrl to 'fade out' items before they are
    really deleted. Mixin like this:

    Assumption: the background colour of the control is wx.WHITE

    class MyListCtrl(FadeMixin, wx.ListCtrl):
        ...
    '''
    def __init__(self, *args, **kwargs):
        self.__bgColour = wx.WHITE
        super(FadeMixin, self).__init__(*args, **kwargs)

    def DeleteItem(self, index, fadeStep=10, fadeSpeed=50):
        if self.IsEnabled():
            self.__startDeleteItem(index)
        fgColour, bgColour, transparentColour = self.__getColours(index)
        if fgColour == bgColour == transparentColour:
            self.__finishDeleteItem(index)
        else:
            for colour, setColour in [(fgColour, self.SetItemTextColour), 
                                      (bgColour, self.SetItemBackgroundColour)]:
                fadedColour = self.__fadeColour(colour, transparentColour, 
                                                fadeStep)
                setColour(index, fadedColour)
            wx.FutureCall(50, self.DeleteItem, index, fadeStep, fadeSpeed)

    def SetBackgroundColour(self, colour):
        self.__bgColour = colour
        super(FadeMixin, self).SetBackgroundColour(colour)

    def GetBackgroundColour(self):
        return self.__bgColour

    def __startDeleteItem(self, index):
        # Prevent user input during deletion. Things could get messy if
        # the user deletes another item when we're still busy fading out the 
        # first one:
        self.Disable()
        # Unselect the item that is to be deleted to make the fading visible:
        currentState = self.GetItemState(index, wx.LIST_STATE_SELECTED)
        self.SetItemState(index, ~currentState, wx.LIST_STATE_SELECTED)

    def __finishDeleteItem(self, index):
        super(FadeMixin, self).DeleteItem(index)
        self.Enable()

    def __getColours(self, index):
        fgColour = self.GetItemTextColour(index)
        bgColour = self.GetItemBackgroundColour(index)
        transparentColour = self.GetBackgroundColour()
        if not bgColour:
            bgColour = transparentColour
        return fgColour, bgColour, transparentColour

    def __fadeColour(self, colour, transparentColour, fadeStep):
        newColour = []
        for GetIntensity in wx.Colour.Red, wx.Colour.Green, wx.Colour.Blue:
            currentIntensity = GetIntensity(colour) 
            transparentIntensity = GetIntensity(transparentColour)
            if currentIntensity < transparentIntensity:
                newIntensity = min(transparentIntensity,
                                   currentIntensity + fadeStep)
            elif currentIntensity > transparentIntensity:
                newIntensity = max(transparentIntensity, 
                                currentIntensity - fadeStep)
            else:
                newIntensity = transparentIntensity
            newColour.append(newIntensity)
        return wx.Colour(*newColour)


class ListCtrl(FadeMixin, wx.ListCtrl):
    pass


class Frame(wx.Frame):
    def __init__(self, *args, **kwargs):
        super(Frame, self).__init__(*args, **kwargs)
        self.list = ListCtrl(self, style=wx.LC_REPORT)
        self.list.InsertColumn(0, 'Column 0')
        self.list.InsertColumn(1, 'Column 1')
        self.fillList()
        self.Bind(wx.EVT_LIST_ITEM_SELECTED, self.onSelected)
        self.Bind(wx.EVT_LIST_DELETE_ITEM, self.onDeleted)

    def onSelected(self, event):
        self.list.DeleteItem(event.GetIndex())

    def onDeleted(self, event):
        if self.list.GetItemCount() == 1:
            wx.CallAfter(self.fillList, False)

    def fillList(self, firstTime=True):
        for row in range(10):
            self.list.InsertStringItem(row, 'Item %d, Column 0'%row)
            self.list.SetStringItem(row, 1, 'Item %d, Column 1'%row)
        self.list.SetItemBackgroundColour(1, wx.BLUE)
        self.list.SetItemTextColour(2, wx.BLUE)
        self.list.SetItemBackgroundColour(3, wx.GREEN)
        self.list.SetItemTextColour(4, wx.GREEN)
        self.list.SetItemBackgroundColour(5, wx.RED)
        self.list.SetItemTextColour(6, wx.RED)
        self.list.SetItemBackgroundColour(7, wx.BLACK)
        self.list.SetItemTextColour(7, wx.WHITE)
        self.list.SetItemBackgroundColour(8, wx.WHITE)
        self.list.SetItemTextColour(8, wx.BLACK)
        if not firstTime:
            self.list.SetBackgroundColour(wx.BLUE)


app = wx.App(False)
frame = Frame(None, title='Select an item to fade it out')
frame.Show()
app.MainLoop()

Answer 2

据我所知，您只能在框架窗口小部件上设置透明度，并查看其对所有子项的影响。我不记得为什么在单个小部件上设置透明度不起作用。无论如何，模拟这样的事情的一个不错的方法是使用循环通过一种颜色的不同阴影列表的wx.Timer，然后当迭代完成时，将其重置回正常颜色。这应该足以模拟外观。

淡入/淡出wxpython网格单元格的背景颜色

2 个答案: