隐藏 Qt 小部件并保留小部件空间 [英] Hiding Qt widget and keeping widget space

问题描述

在一个简单的表单中，我制作了几个按钮并放置了一个水平布局.当鼠标离开该区域时，应隐藏其中一个按钮，即最后一个按钮.使用 button->hide() 它可以工作，但是所有按钮都由布局管理器重新排列.我想要的是所有其他按钮都保持在它们的位置.我尝试用小部件占位符替换小部件并交换按钮和占位符 hide()/show()，调用 placeholder->resize(button->size())，但布局管理器不考虑调整大小，并且占位符设置为其最小大小.删除小部件并保留其空间的最佳方法是什么?

In a simple form I made a few buttons and put a horizontal layout. When mouse leaves the area one of the buttons, the last one, should be hidden. Using button->hide() it works, but all the buttons are rearranged by the layout manager. What I want is that all other buttons remain in their positions. I tried replacing the widget with a widget placeholder and swapping the button and placeholder hide()/show(), calling placeholder->resize(button->size()), but the layout manager doesn't respect the resize, and the placeholder is set with its minimum size. What is the best way to remove a widget and keep its space?

推荐答案

在 Qt 5.2 中可以执行以下操作:

In Qt 5.2 it is possible to do the following:

QSizePolicy sp_retain = widget->sizePolicy();
sp_retain.setRetainSizeWhenHidden(true);
widget->setSizePolicy(sp_retain);

我之前在这里发布了相同的解决方案:

I earlier posted the same solution here:

如何在不改变其他 Qt 小部件位置的情况下使 Qt 小部件不可见?

(这似乎是这个问题的重复).

(which seems to be a duplicate of this question).

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