Why Pushbutton Text Overflow Happens in Qt Designer
In Qt Designer, a pushbutton has a default fixed size policy that can clip or hide long text labels, especially when using stylesheets or translations that change word length. The widget uses QPushButton, which inherits from QAbstractButton and QWidget, and its size is controlled by sizePolicy, minimumSize, maximumSize, and the text margin settings defined in the UI file. When the text changes after translation or dynamic content updates, the button may not resize automatically unless the layout engine and size constraints are configured correctly. This behavior is documented in the Qt Widgets module reference and affects layouts built with Qt Designer version 6.x and earlier Qt 5 versions QPushButton class reference.
Common triggers include setting a fixed width in the property editor, applying a stylesheet with explicit width or padding, or placing the button inside a layout that ignores size hints. Qt Designer generates a .ui file that stores these properties as XML, and the Qt resource compiler (rcc) and User Interface Compiler (uic) translate them into C++ code at build time. If the .ui file sets a static size or the parent layout has spacing constraints, the button will not grow to fit new text even if the text property is changed later Using UI Files with Qt Designer.
Step by Step to Change Pushbutton Size to Fit Text
Open the .ui file in Qt Designer, select the pushbutton, and in the Property Editor set the sizePolicy horizontal policy to Preferred or Minimum instead of Fixed. Clear any fixed width or height values in the minimumSize and maximumSize fields so the button can shrink or grow with the text. In the text property, type the desired label and observe the preview; if the text is still clipped, increase the text margin or add horizontal spacing in the parent layout QBoxLayout Class.
For dynamic cases where text changes at runtime, ensure the button calls adjustSize() or updateGeometry() after the text is set, or use a QSizePolicy that respects the font metrics and text content. In Qt Designer, you can also set the autoDefault and default properties to control focus and sizing behavior when the dialog is shown. If you are using stylesheets, avoid hardcoded width values and use padding and spacing instead so the button resizes naturally with the label text Qt Style Sheet Reference.
Layout and Stylesheet Settings That Affect Button Sizing
Using Layouts to Control Pushbutton Resizing
Placing the pushbutton inside a QHBoxLayout or QVBoxLayout allows the button to expand or contract based on its size hint, which is calculated from the font, text, and margin settings. In Qt Designer, right-click the layout and choose Adjust Size or use the form layout manager to distribute space so the button grows when the text becomes longer. Set the layout spacing and margin properties to values that prevent clipping while keeping the UI compact.
Stylesheet Rules That Influence Button Dimensions
When a stylesheet is applied to the pushbutton, properties like min-width, max-width, padding, and margin can override the size hints and prevent the button from fitting the text. To fix this, remove fixed width values from the stylesheet or use relative units and let the content drive the size. You can also set the QPushButton::subcontrol-origin and padding properties so the text has enough space inside the button without triggering overflow or clipping