Kivy布局高度适应子部件的高度

Question

我想创建一个布局，其中我有一些类似于BoxLayout的东西，让我能够在我的布局中创建“行”，在每个“行”中，我想使用另一个BoxLayout中的某种东西来创建“列”。在

这些列不需要均匀分布。例如，我想创建一个BoxLayout，其中一列具有正方形图像，另一列占据剩余的可用宽度。在

请参阅我的要点上的代码和屏幕截图：https://gist.github.com/MichaelGradek/e5c50038b947352d9e79

我已经在上面的代码中完成了基本结构，但除此之外，我希望BoxLayout的高度适应孩子们的身高。

实现这一目标的最佳方法是什么？在

谢谢！在

Answer 1

这里有一些技巧，我已经想出了根据子级高度设置GridLayout高度的技巧，但是，这两种方法都要求每行有一个子级。。。因此，制作列确实需要添加内部网格布局。在

# kv file or string
<Resizing_GridLayout@GridLayout>:
    cols: 1
    row_force_default: True
    foo: [self.rows_minimum.update({i: x.height}) for i, x in enumerate(reversed(list(self.children)))]

以上内容可以通过Python代码或静态的kv条目添加，并且在我的项目中，至少可以通过调整包含的子小部件中的每一行的大小来实现。在

^{pr2}$

为了完整起见，举个例子来说明如何将它们缝合在一起。。。在

# ... assuming above have been set, bellow maybe within another layout
Resizing_GridLayout:
    ResizingRow_GridLayout:
        Label:
            height: 30
            text: 'Label One'
        TextInput:
            height: 30
            multiline: False
            write_tab: False
            hint_text: 'Insert one liner'
    ResizingRow_GridLayout:
        Label:
            height: 45
            text: 'Label two'
        Button:
            text: 'Button One'
            height: 60
        GridLayout:
            rows: 1
            height: 25
            Button:
                text: 'Button Two'
            Button:
                text: 'Button three'

---

更新

^{}

#!/usr/bin/env python

from collections import OrderedDict
from kivy.uix.gridlayout import GridLayout
from kivy.clock import Clock


class Adaptive_GridLayout(GridLayout):
    """
    Adaptive height and row heights for grid layouts.

    Note this should not be used as a root layout and '_refresh_grids_y_dimension()' method should be used by
    children widgets that change height to update all attached instances of Adaptive_GridLayout (this layout).

    Copyright AGPL-3.0 2019 S0AndS0
    """

    def __init__(self, grow_cols = False, grow_rows = False, **kwargs):
        super(Adaptive_GridLayout, self).__init__(**kwargs)
        self.grow_cols = grow_cols
        self.grow_rows = grow_rows
        self.trigger_refresh_y_dimension = Clock.create_trigger(lambda _: self._refresh_grids_y_dimension(), 0)

    def _yield_tallest_of_each_row(self):
        """ Yields tallest child of each row within gridlayout. """
        current_tallest = None
        for i, c in enumerate(list(reversed(self.children))):
            if current_tallest is None:
                current_tallest = c

            if c.height > current_tallest.height:
                current_tallest = c

            ## Should work around grids without value for 'cols'
            if self.cols is None or self.cols is 0:
                yield current_tallest
                current_tallest = None
            ## Reached last item of current row... Fizzbuzz!
            elif ((i + 1) % self.cols == 0) is True:
                yield current_tallest
                current_tallest = None

    def _calc_child_padding_y(self, child):
        """ Returns total padding for a given child. """
        ## May be faster than asking permission with an if statement as most widgets seem to have padding
        try:
            child_padding = child.padding
        except AttributeError as e:
            child_padding = [0]

        len_child_padding = len(child_padding)
        if len_child_padding is 1:
            padding = child_padding[0] * 2
        elif len_child_padding is 2:
            padding = child_padding[1] * 2
        elif len_child_padding > 2:
            padding = child_padding[1] + child_padding[3]
        else:
            padding = 0

        return padding

    def _calc_min_height(self):
        """ Returns total height required to display tallest children of each row plus spacing between widgets. """
        min_height = 0
        for c in self._yield_tallest_of_each_row():
            min_height += c.height + self._calc_child_padding_y(child = c) + self.spacing[1]
        return min_height

    def _calc_rows_minimum(self):
        """ Returns ordered dictionary of how high each row should be to accommodate tallest children of each row. """
        rows_minimum = OrderedDict()
        for i, c in enumerate(self._yield_tallest_of_each_row()):
            rows_minimum.update({i: c.height + self._calc_child_padding_y(child = c)})
        return rows_minimum

    def _refresh_height(self):
        """ Resets 'self.height' using value returned by '_calc_min_height' method. """
        self.height = self._calc_min_height()

    def _refresh_rows_minimum(self):
        """ Resets 'self.rows_minimum' using value returned by '_calc_rows_minimum' method. """
        self.rows_minimum = self._calc_rows_minimum()

    def _refresh_grids_y_dimension(self):
        """ Updates 'height' and 'rows_minimum' first for spawn, then for self, and finally for any progenitors. """
        spawn = [x for x in self.walk(restrict = True) if hasattr(x, '_refresh_grids_y_dimension') and x is not self]
        for item in spawn:
            item._refresh_rows_minimum()
            item._refresh_height()

        self._refresh_rows_minimum()
        self._refresh_height()

        progenitors = [x for x in self.walk_reverse() if hasattr(x, '_refresh_grids_y_dimension') and x is not self]
        for progenitor in progenitors:
            progenitor._refresh_rows_minimum()
            progenitor._refresh_height()

    def on_children(self, instance, value):
        """ If 'grow_cols' or 'grow_rows' is True this will grow layout that way if needed instead of erroring out. """
        smax = self.get_max_widgets()
        widget_count = len(value)
        if smax and widget_count > smax:
            increase_by = widget_count - smax
            if self.grow_cols is True:
                self.cols += increase_by
            elif self.grow_rows is True:
                self.rows += increase_by
        super(Adaptive_GridLayout, self).on_children(instance, value)

    def on_parent(self, instance, value):
        """ Some adjustments maybe needed to get top row behaving on all platforms. """
        self.trigger_refresh_y_dimension()

上面是我发布的一个项目，它是从一个更大的项目中提取出来的，可能适合也可能不适合那些希望在Python方面有更多逻辑来更新维度的人。查看ReadMe文件，以获取有关在另一个项目中安装的提示。在

Answer 2

不要使用BoxLayout，使用带有height: self.minimum_height的GridLayout，并为每个子小部件设置手动大小（size_hint_y: None和{}）。在