如何用Python和Kivy缩小或消除MDIconButton背景与内边距

问题描述 #

我编写了一段创建MDIconButton的简单Python代码如下：

icon = MDIconButton(
    icon = "close-circle",
    md_bg_color = "red",
    theme_icon_color = "Custom",
    icon_color = "white",
    pos_hint = {"top": 1, "right": 1},
    icon_size = "18sp",
)

该按钮在目标Widget中尺寸过大，我尝试通过icon_size属性缩小它，但当图标尺寸调至一定值后，按钮背景会比图标本身更大。请问是否可以缩小甚至完全消除MDIconButton的背景及内边距？

解决方案 #

• 完全消除背景：将md_bg_color设为transparent，直接去掉背景色：

  icon = MDIconButton(
      icon = "close-circle",
      md_bg_color = "transparent",
      theme_icon_color = "Custom",
      icon_color = "white",
      pos_hint = {"top": 1, "right": 1},
      icon_size = "18sp",
  )
  

• 移除/缩小内边距：MDIconButton默认带有内边距，通过padding属性设置为0或自定义数值即可消除多余间距：

  icon = MDIconButton(
      icon = "close-circle",
      md_bg_color = "red",
      theme_icon_color = "Custom",
      icon_color = "white",
      pos_hint = {"top": 1, "right": 1},
      icon_size = "18sp",
      padding = 0,
  )
  

• 同时移除背景和内边距：结合上述两个属性，让按钮仅显示图标：

  icon = MDIconButton(
      icon = "close-circle",
      md_bg_color = "transparent",
      theme_icon_color = "Custom",
      icon_color = "white",
      pos_hint = {"top": 1, "right": 1},
      icon_size = "18sp",
      padding = 0,
  )
  

• 保留背景但匹配图标尺寸：如果需要保留背景，可通过radius属性调整背景大小，使其与图标尺寸一致（半径设为图标尺寸的一半）：

  icon = MDIconButton(
      icon = "close-circle",
      md_bg_color = "red",
      theme_icon_color = "Custom",
      icon_color = "white",
      pos_hint = {"top": 1, "right": 1},
      icon_size = "18sp",
      padding = 0,
      radius = "9sp",
  )
  

内容的提问来源于stack exchange，提问作者Timson