CheckboxTreeview() - 复选框的缩放大小，更改颜色

Question

CheckboxTreeview() for Python 的 Tkinter 是一个了不起的类。不幸的是，在 HDPI 显示器（比如我的 4K 电视）上，该复选框很难阅读：

如何在 HDPI 显示器上更容易识别复选框？可以换颜色吗？

Answer 1

CheckboxTreeview() 使用 19x14 像素大小的库存 .png 图像，可能看起来很小。我创建了一个函数来根据字体大小制作可缩放的复选框：

注意我删除了在发现 CheckboxTreeview() 之前使用的旧程序中的背景选择突出显示

代码非常简单，并且包含 cmets 以方便使用：

def make_checkboxes(hgt, outc, fillc, chkc):

    ''' Create CheckboxTreeview(); 'unchecked', 'checked' and 'tristate'
        Parms: height, outline color, fill color, checkmark color

        Returns list of three PhotoImages for parent. How to use 4K screen:

            MON_FONTSIZE = 12
            row_height=int(MON_FONTSIZE*2.2)
            style.configure("Treeview", font=(None, MON_FONTSIZE), \
                            rowheight=row_height)

            self.checkboxes = make_checkboxes(row_height-6, 'black', \
                                              'white', 'deepskyblue')
            self.cd_tree.tag_configure("unchecked", image=self.checkboxes[0])
            self.cd_tree.tag_configure("tristate", image=self.checkboxes[1])
            self.cd_tree.tag_configure("checked", image=self.checkboxes[2])

    '''
    from PIL import Image, ImageTk, ImageDraw       # Pillow image processing

    if hgt % 2 == 1: hgt = hgt + 1                  # even number box height
    if hgt < 14: hgt = 14                           # minimum box height
    wid = hgt                                       # square: width = heidht
    wid_pad = int(wid * 10 / 20)                    # lead + trailing padding
    xo = int(wid_pad / 5)                           # x-offset after lead pad
    retn_images = []                                # list of three images

    image = Image.new("RGBA", (wid + wid_pad, hgt), (0, 0, 0, 0))
    draw = ImageDraw.Draw(image)                    # Create drawable image

    draw.rectangle([(xo, 0), (xo + wid, hgt-1)], fill=fillc, outline=outc)
    retn_images.append(ImageTk.PhotoImage(image))   # Unchecked
    draw.rectangle([(xo+3, 7), (xo + wid-3, hgt-8)], fill=chkc)
    retn_images.append(ImageTk.PhotoImage(image))   # Tristate
    draw.rectangle([(xo+3, 3), (xo + hgt-3, hgt-4)], fill=chkc)
    retn_images.append(ImageTk.PhotoImage(image))   # Checked

    return retn_images

Answer 2

补充给定的答案：这将绘制一个实际的“选中”图标而不是矩形。最终尺寸应符合已给出答案的尺寸。

它看起来像这样：

编辑：但你当然可以使用任何你喜欢的颜色

scalingFactor = 10

imageChecked = Image.new("RGBA", ((wid + wid_pad) *scalingFactor, hgt *10), (0, 0, 0, 0))
drawChecked = ImageDraw.Draw(imageChecked) 
drawChecked.rectangle([(xo*scalingFactor, 0), ((xo + wid)*scalingFactor, (hgt-1)*scalingFactor)], fill=fillc, outline=outc)

startPoint = (xo*scalingFactor+int(0.15*wid*scalingFactor), (0.6*hgt*scalingFactor))
middlePoint = (xo*scalingFactor+int(0.5*wid*scalingFactor), (int(0.8*hgt*scalingFactor)))
endPoint =(xo*scalingFactor+int(0.85*wid*scalingFactor), (int(0.1*hgt*scalingFactor)))

drawChecked.line([startPoint,middlePoint,endPoint], fill=chkc, width=int(hgt*scalingFactor/5), joint="curve")

imageChecked = imageChecked.resize((wid+wid_pad, hgt), Image.ANTIALIAS)