Qt fix aspect ration widget

Sometimes you want your widget to be resizable but maintain a fixed aspect ratio. For example: video-streams, images or charts

This is a small proof-of-concept, showing how this is done.

• Blue-Widget: the whole main-window
• Green-Widget: The class qt_ratio_widget;
• Orange-Widget: Some user arbitrary user content

DOCUMENTATION

Usage

for just using it, you can use the class qt_ratio_widget; as a common widget.

• By hand, see main.cpp
• By Designer, add a widget and promote it to qt_ratio_widget

Insight

As a QLayout handles how QWidgets ar positioned, the size-management is actually done by a QWidget. Therefore the qt_ratio_widget is a QWidget. The implementation is easy, once figured out where to put it. :-)

FEATURES

• Drop-In replacement of a current QWidget
• extended with void qt_ratio_widget::ratio(double r) which can be:
  • r = 1.0 for a square
  • r = 16.0/9.0 for a 16:9 ratio

LICENSE

SPDX-License-Identifier: MIT

Licensed under the MIT License http://opensource.org/licenses/MIT.