wxpython 树控件图像

Question

好的，这里有一个例子：

可运行的例子

点击这里下载例子

把压缩包解压出来，然后运行，不然是没法工作的。

不过，当你运行的时候，图片不会被添加到树形控件里，结果会出错。

代码（注意：没有图片的话是无法运行的，见上面的压缩包）

import wx

class TestFrame(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self, None, -1)

        self.tree = wx.TreeCtrl(self, style = wx.TR_HIDE_ROOT)
        self.root = self.tree.AddRoot("")

        gr = self.tree.AppendItem(self.root, "Grooveshark")
        pop_r = self.tree.AppendItem(gr, "Popular")
        sr = self.tree.AppendItem(gr, "Search")

        dr = self.tree.AppendItem(self.root, "Download")

        pr = self.tree.AppendItem(self.root, "Pandora")
        stat_r = self.tree.AppendItem(pr, "Stations")

        image_list = wx.ImageList(16, 16)
        grooveshark = image_list.Add(wx.Image("images/grooveshark (Custom).png", wx.BITMAP_TYPE_PNG).ConvertToBitmap())
        popular     = image_list.Add(wx.Image("images/popular (Custom).png", wx.BITMAP_TYPE_PNG).ConvertToBitmap())
        search      = image_list.Add(wx.Image("images/search (Custom).png", wx.BITMAP_TYPE_PNG).ConvertToBitmap())
        download    = image_list.Add(wx.Image("images/download (Custom).png", wx.BITMAP_TYPE_PNG).ConvertToBitmap())
        pandora     = image_list.Add(wx.Image("images/playlist_icon (Custom).png", wx.BITMAP_TYPE_PNG).ConvertToBitmap())
        stations    = image_list.Add(wx.Image("images/stations (Custom).png", wx.BITMAP_TYPE_PNG).ConvertToBitmap())

        self.tree.SetPyData(gr, None)
        self.tree.SetItemImage(gr, grooveshark, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(pop_r, None)
        self.tree.SetItemImage(pop_r, popular, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(sr, None)
        self.tree.SetItemImage(sr, search, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(dr, None)
        self.tree.SetItemImage(dr, download, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(pr, None)
        self.tree.SetItemImage(pr, pandora, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(stat_r, None)
        self.tree.SetItemImage(stat_r, stations, wx.TreeItemIcon_Normal)


if __name__ == "__main__":
    a = wx.App(False)

    f = TestFrame()
    f.Show()
    a.MainLoop()

为什么会这样呢？

我按照wxPython演示应用里的示例做的，但还是没成功。

Answer 1

你的代码有两个问题。

1. 并不是所有的图片都是16像素 x 16像素，但你却想把它们添加到一个只应该包含16 x 16图片的列表中。要解决这个问题，你需要在添加到列表之前，把这些图片缩放到16 x 16的大小。

2. 在给树形结构的每个项目应用图片之前，你应该先把图片列表分配给树形对象。

下面是修正后的代码：

import wx

class TestFrame(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self, None, -1)

        self.tree = wx.TreeCtrl(self, style = wx.TR_HIDE_ROOT)
        self.root = self.tree.AddRoot("")

        gr = self.tree.AppendItem(self.root, "Grooveshark")
        pop_r = self.tree.AppendItem(gr, "Popular")
        sr = self.tree.AppendItem(gr, "Search")

        dr = self.tree.AppendItem(self.root, "Download")

        pr = self.tree.AppendItem(self.root, "Pandora")
        stat_r = self.tree.AppendItem(pr, "Stations")

        image_list = wx.ImageList(16, 16)
        grooveshark = image_list.Add(wx.Image("images/grooveshark (Custom).png", wx.BITMAP_TYPE_PNG).Scale(16,16).ConvertToBitmap())
        popular     = image_list.Add(wx.Image("images/popular (Custom).png", wx.BITMAP_TYPE_PNG).Scale(16,16).ConvertToBitmap())
        search      = image_list.Add(wx.Image("images/search (Custom).png", wx.BITMAP_TYPE_PNG).Scale(16,16).ConvertToBitmap())
        download    = image_list.Add(wx.Image("images/download (Custom).png", wx.BITMAP_TYPE_PNG).Scale(16,16).ConvertToBitmap())
        pandora     = image_list.Add(wx.Image("images/playlist_icon (Custom).png", wx.BITMAP_TYPE_PNG).Scale(16,16).ConvertToBitmap())
        stations    = image_list.Add(wx.Image("images/stations (Custom).png", wx.BITMAP_TYPE_PNG).Scale(16,16).ConvertToBitmap())

        self.tree.AssignImageList(image_list)

        self.tree.SetPyData(gr, None)
        self.tree.SetItemImage(gr, grooveshark, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(pop_r, None)
        self.tree.SetItemImage(pop_r, popular, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(sr, None)
        self.tree.SetItemImage(sr, search, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(dr, None)
        self.tree.SetItemImage(dr, download, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(pr, None)
        self.tree.SetItemImage(pr, pandora, wx.TreeItemIcon_Normal)
        self.tree.SetPyData(stat_r, None)
        self.tree.SetItemImage(stat_r, stations, wx.TreeItemIcon_Normal)


if __name__ == "__main__":
    a = wx.App(False)

    f = TestFrame()
    f.Show()
    a.MainLoop()